CN107800526A - The method and apparatus of signal transacting - Google Patents

Abstract

Embodiments of the present application provide a signal processing method and device. The method includes that the first device receives a first message sent by a second device; the first device determines a target duration of a synchronization signal according to the first message; the first device generates a second message according to the target duration of the synchronization signal, The second message includes the synchronization signal, and the duration of the synchronization signal is the target duration; the first device sends the second message to the second device. According to the embodiment of the present application, the first device can determine the appropriate duration of the synchronization signal according to the first message sent by the second device, and send the second message including the synchronization signal whose duration is the target duration to the second device, thereby avoiding sending redundant The second message of the remaining synchronization signal duration wastes channel resources and improves the utilization rate of channel resources.

Description

Method and device for signal processing

technical field

The present application relates to the field of communication, and more particularly, to methods and devices for signal processing.

Background technique

The Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 standard organization plans to develop a wireless fidelity Internet of Things (Wireless Fidelity Internet of Things, WiFi IoT) standard based on the 2.4G/5GHz frequency band, whose basic feature is low power consumption and long distances. An existing method is to reduce power consumption by using a low power consumption (Lower Power, LP) wake-up radio frequency (Wake-up Radio, WUR) on the side of a WiFi IoT device. The wake-up radio frequency is also called a wake-up receiver (Wake-up Receiver, WUR).

The frame that WUR can receive is called WUR frame, in the prior art, the frame structure of WUR frame can comprise synchronous signal (Synchronization, SYNC) and starting frame delimiter (Starting Frame Delimiter, SFD), and this and 802.11b Similarly, the function of SYNC is to enable the receiving end to synchronize with the sending end. The SYNC part in the two frame formats supported by 802.11b is a 128-bit all-1 sequence and a 56-bit all-1 sequence respectively, and the length of the SYNC part is fixed. The use of a fixed-length SYNC usually takes the worst case into consideration, that is, the length of the SYNC required to complete timing synchronization in the worst case of a channel. Obviously, this length is relatively long. The actual communication is not always in the worst case, so it is not necessary to always use the most conservative SYNC length. Therefore, in the prior art, transmitting a WUR frame including a fixed-length SYNC signal causes a waste of channel resources.

Contents of the invention

Embodiments of the present application provide a signal processing method and device, which can improve the utilization rate of channel resources.

In a first aspect, a signal processing method is provided, the method includes: a first device receives a first message sent by a second device; the first device determines a target duration of the synchronization signal according to the first message; the first device A device generates a second message according to the target duration of the synchronization signal, the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration; the first device sends the second message to the second device.

In this embodiment of the present application, the first device receives the first message sent by the second device, determines the target duration of the synchronization signal according to the first message, and generates a second message, the second message includes the synchronization signal, and the second message includes The duration of the synchronization signal is the target duration, and the second message is sent to the second device, so that the second device is synchronized with the first device, so that the second message sent by the first device to the second device has a relatively short, but The synchronization signal is enough for the second device to complete the synchronization function, thereby reducing the waste of media resources and improving the efficiency of media utilization.

In some possible implementation manners, the first message carries the expected duration of the synchronization signal, and the expected duration indicates the duration of the synchronization signal required for the second device to complete synchronization with the first device; wherein, the first device According to the first message, determining the target duration of the synchronization signal includes: determining, by the first device, the target duration according to the expected duration, where the target duration is greater than or equal to the expected duration.

After receiving the expected duration (denoted as L ₀ ) sent by the second device, the first device determines the target duration of the synchronization signal (denoted as L) according to L ₀ . L is not less than L ₀ , preferably L=L ₀ . In this way, by carrying the expected duration in the first message, the first device can determine the target duration of the synchronization signal, which saves power consumption of the first device.

In some possible implementation manners, before the first device receives the first message sent by the second device, the method further includes: the first device sends a third message to the second device on the first channel to making the second device measure the channel quality of the first channel according to the third message to generate a channel quality measurement result of the first channel, and determine the expected duration of the synchronization signal according to the channel quality measurement result of the first channel.

The first device may send a third message to the second device, so that the second device determines the channel quality measurement result between the first device and the second device according to the third message, so that the second device can determine the channel quality measurement result based on the channel quality measurement result The expected duration is determined more accurately, so the first device can accurately determine the target duration according to the expected duration, thereby further improving media utilization efficiency.

In some possible implementation manners, the first device receiving the first message sent by the second device includes: the first device receiving the first message sent by the second device on a first channel; wherein the first device receives the first message sent by the second device according to For the first message, determining the target duration of the synchronization signal includes: the first device measures the channel quality of the first channel according to the first message and generates a channel quality measurement result of the first channel; the first device according to the first message The channel quality measurement result of the first channel determines the target duration of the synchronization signal.

The first device receives the first message on the first channel, and determines the channel quality of the first channel according to the first message and generates the channel quality measurement result of the first channel, so that the first device can The quality measurement result determines the target duration of the synchronization signal, that is, the first device takes the channel quality from the second device to the first device as the channel quality from the first device to the second device according to the channel mutuality, that is, the first device The channel quality can be obtained without separately sending the channel measurement information, thereby reducing the overhead of the first device.

In some possible implementation manners, the method further includes: before the first device receives the first message sent by the second device, the first device sends a third message to the second device on a first channel, the The third message is used by the second device to measure the channel quality of the first channel and generate the channel quality measurement result of the first channel; the first message carries the channel quality measurement result of the first channel; wherein, the first device According to the first message, determining the target duration of the synchronization signal includes: the first device determining the target duration of the synchronization signal according to the channel quality measurement result of the first channel.

The first device may send a third message to the second device, so that the second device determines the channel quality measurement result between the first device and the second device according to the third message, and the first device receives the channel quality sent by the second device In this way, the first device can more accurately determine the target duration according to the channel quality measurement result, and at the same time, the second device does not need to determine the expected duration according to the channel measurement result, thereby saving the power consumption of the second device.

In some possible implementations, the method further includes: before the first device receives the first message sent by the second device, the first device receives receiving capability information sent by the second device, and the receiving capability information Indicates the ability of the second device to receive the second message; wherein, the first device determines the target duration of the synchronization signal according to the channel quality measurement result of the first channel includes: the first device determines the target duration of the synchronization signal according to the channel quality of the first channel The quality measurement result and the receiving capability information determine the target duration of the synchronization signal.

The first device can accurately determine the target duration of the synchronization signal according to the channel quality measurement result and the receiving capability information of the second device. This method is the most direct and accurate, thereby improving the accuracy of determining the target duration.

In some possible implementation manners, the first channel includes at least one sub-channel; where the first device sends the second message to the second device includes: at least one sub-channel of the first device in the first channel Send the second message to the second device on the channel.

When the first device sends the second message to the second device, it uses a channel that has been used before, or a sub-channel of the channel that has been used. For example, the channel that has been used can be used when the first device sends a third message to the second device. The used channel may also be the channel used when the second device sends the second message to the first device. In this way, by using the channel that has already been used, the first device can avoid using a faulty channel and improve the efficiency of sending the second message.

In a second aspect, a signal processing method is provided. The method includes: a second device sends a first message to a first device, and the first message is used by the first device to determine a target duration of a synchronization signal and generate a second message, the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration; the second device receives the second message sent by the first device; the second device receives the synchronization signal according to the synchronization signal in the second message , to synchronize with the first device.

The second device sends a first message to the first device, so that the first device determines the target duration of the synchronization signal according to the first message, and generates a second message according to the target duration, the second message includes the synchronization signal, and the first device The duration of the synchronization signal included in the second message is the target duration, and then the second message sent by the first device is received, and the second device synchronizes with the first device according to the synchronization signal in the second message, so that the first device and the The negotiation of the second device makes the second message a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency.

In some possible implementation manners, the method further includes: the second device determines an expected duration of the synchronization signal, and the expected duration of the synchronization signal represents the length of the synchronization signal required for the second device to complete synchronization with the first device. duration; wherein, the second device sending the first message to the first device includes: the second device sending the first message carrying the expected duration of the synchronization signal to the first device.

The second device determines the duration of the synchronization signal required for synchronization with the first device (expressed as the expected duration), and sends it to the first device through the first message, and then the first device can accurately The target duration is determined, thereby saving the power consumption of the first device.

In some possible implementations, the method further includes: the second device receives a third message, the third message is used to measure the channel quality of the first channel; the second device determines the first channel quality according to the third message A channel quality measurement result of the channel; wherein, the second device determining the expected duration of the synchronization signal includes: the second device determining the expected duration of the synchronization signal according to the channel quality measurement result of the first channel.

The second device receives the third message, and determines the channel quality measurement result according to the third message, so that the second device can accurately determine the expected duration according to the channel quality measurement result, and sends the expected duration to the first device, so that the first The device can accurately determine the target duration, thereby further improving the efficiency of media utilization.

In some possible implementations, the method further includes: the second device receives a third message, the third message is used to measure the channel quality of the first channel; the second device determines the first channel quality according to the third message A channel quality measurement result of the channel; where the second device sending the first message to the first device includes: the second device sending the first message carrying the channel quality measurement result of the first channel to the first device.

The second device determines the channel measurement result according to the third message, and sends it to the first device, and the first device determines the target duration according to the channel measurement result, so that the second device does not need to determine the expected duration according to the channel measurement result, saving the second The power consumption of the device.

In a third aspect, a method for determining the length of a synchronization signal for sending a message is provided. The method includes: a first device receives a first message sent by a second device through a first interface or a second interface, and the first device receives the first message based on the The first message determines the length L of the synchronization signal; the first device generates a second message, the second message contains the first synchronization signal, and the length of the first synchronization signal is L; the first device generates the second message through the first synchronization signal An interface sends the second message to the second device.

In some possible implementation manners, before the first device receives the first message sent by the second device through the first interface or the second interface, the first device sending a third message, so that the second device measures a channel based on the third message, and obtains a channel measurement result; wherein, the channel used by the first device to send the third message is the first channel, The channel used by the first device to send the second message is a second channel, the second channel is a subchannel of the first channel, and the channel measurement result includes at least The measurement results of the second channel are described.

In some possible implementation manners, the first device receives the first message sent by the second device through the second interface, and the first device determines the synchronization signal length L based on the first message, including: the first The message includes the channel measurement result, and the first device determines the synchronization signal length L based on the channel measurement result.

In some possible implementation manners, the first device receives the first message sent by the second device through the second interface, and the first device determines the synchronization signal length L based on the first message, including: the first The message includes the length L ₀ of the synchronization signal expected by the second device, and the first device determines the L based on the L ₀ , where L≥L ₀ .

In some possible implementation manners, the first device determining the synchronization signal length L based on the first message includes: the first device measures a channel based on the first message, obtains a channel measurement result, and based on the The channel measurement result determines the synchronization signal length L; wherein, the channel used by the second device to send the first message is the third channel, and the channel used by the first device to send the second message is the second channel, The second channel is a sub-channel of the third channel, and the channel measurement result at least includes a measurement result of the second channel by the first device.

In some possible implementation manners, the second interface is the main communication interface.

In a fourth aspect, a first device is provided, the first device can communicate with a second device, and the first device includes: the first device receives the first device sent by the second device through the first interface or the second interface. message; a determining unit, configured to determine a synchronization signal length L based on the first message; a generating unit, configured to generate a second message, wherein the second message includes a first synchronization signal, and the length of the first synchronization signal is L: After receiving the first message, the first interface is further configured to send the second message to the second device.

In some possible implementation manners, the first interface or the second interface is further configured to: before the first device receives the first message sent by the second device through the first interface or the second interface, The first device sends a third message through the first interface or the second interface, so that the second device measures a channel based on the third message and obtains a channel measurement result; wherein, the first device sends the The channel used by the third message is the first channel, the channel used by the first device to send the second message is the second channel, the second channel is a subchannel of the first channel, and the The channel measurement result at least includes a measurement result of the second channel by the second device.

In some possible implementation manners, the second interface is configured to receive a first message sent by the second device, and the determining unit is configured to determine a synchronization signal length L based on the first message, including: the first A message includes the channel measurement result, and the first device determines the synchronization signal length L based on the channel measurement result.

In some possible implementation manners, the second interface is configured to receive a first message sent by the second device, and the determining unit is configured to determine a synchronization signal length L based on the first message, including: the first A message includes a length L ₀ of the synchronization signal expected by the second device, and the first device determines the L based on the L0, where L≥L ₀ .

In some possible implementation manners, the determining unit is configured to determine the synchronization signal length L based on the first message, including: the first device measures a channel based on the first message, obtains a channel measurement result, and based on the The channel measurement result determines the synchronization signal length L; wherein, the channel used by the second device to send the first message is the third channel, and the channel used by the first device to send the second message is the second channel , the second channel is a subchannel of the third channel, and the channel measurement result at least includes a measurement result of the second channel by the first device.

In some possible implementation manners, the first interface is a wake-up radio frequency interface, and the second interface is a main communication interface.

In a fifth aspect, a first device is provided, and the first device includes a module for executing the method in the first aspect or any possible implementation manner of the first aspect.

In a sixth aspect, a second device is provided, and the second device includes a module for executing the method in the second aspect or any possible implementation manner of the second aspect.

In the seventh aspect, a signal processing system is provided, and the system includes:

The first device of the above-mentioned fifth aspect and the second device of the above-mentioned sixth aspect.

In an eighth aspect, the present application provides a first device, including: a processor, a memory, and a communication interface. The processor is connected with the memory and the communication interface. The memory is used to store instructions, the processor is used to execute the instructions, and the communication interface is used to communicate with other network elements under the control of the processor. When the processor executes the instruction stored in the memory, the execution causes the processor to execute the method in the first aspect or any possible implementation manner of the first aspect.

In a ninth aspect, the present application provides a second device, including: a processor, a memory, and a communication interface. The processor is connected with the memory and the communication interface. The memory is used to store instructions, the processor is used to execute the instructions, and the communication interface is used to communicate with other network elements under the control of the processor. When the processor executes the instruction stored in the memory, the execution causes the processor to execute the second aspect or the method in any possible implementation manner of the second aspect.

In a tenth aspect, the present application provides a computer storage medium, where program code is stored in the computer storage medium, and the program code is used to instruct the execution of the signal in the first aspect or any possible implementation of the first aspect Instructions for processing methods.

In the eleventh aspect, the present application provides a computer storage medium, where program code is stored in the computer storage medium, and the program code is used to instruct the implementation of the above-mentioned second aspect or any possible implementation of the second aspect. Instructions for methods of signal handling.

Based on the above technical solution, by receiving the first message sent by the second device, determining the target duration of the synchronization signal according to the first message, generating a second message, and sending the second message to the second device, so that the first device can The first message sent by the second device determines the appropriate target duration of the synchronization signal, thereby avoiding the waste of channel resources caused by sending the second message including redundant synchronization signal durations, and improving the utilization rate of channel resources.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that are required in the embodiments or the description of the prior art.

Figure 1 is an architecture diagram of a low-power wake-up system;

Fig. 2 is the specific design of a kind of wake-up packet in the prior art;

Fig. 3 is the transmission mode of wake-up packet in the prior art;

Fig. 4 is the frame structure of the WUR frame of the embodiment of the present application;

Fig. 5 is the frame structure of WUR frame in the prior art;

FIG. 6 is a schematic interaction flowchart of a signal processing method according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a signal processing method according to another embodiment of the present application;

FIG. 8 is a schematic structural diagram of a synchronization signal according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a synchronization signal according to an embodiment of the present application;

FIG. 10 is a schematic diagram of a signal processing method according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a signal processing method according to another embodiment of the present application;

FIG. 12 is a schematic diagram of a signal processing method according to another embodiment of the present application;

FIG. 13 is a schematic interaction flowchart of a signal processing method according to another embodiment of the present application;

FIG. 14 is a schematic interaction flowchart of a signal processing method according to another embodiment of the present application;

FIG. 15 is a schematic interaction flowchart of a signal processing method according to another embodiment of the present application;

Fig. 16 is a schematic block diagram of a first device according to an embodiment of the present application;

Fig. 17 is a schematic block diagram of a second device according to an embodiment of the present application;

FIG. 18 is a schematic block diagram of a signal processing system according to an embodiment of the present application;

FIG. 19 is a schematic structural diagram of a first device according to an embodiment of the present application;

FIG. 20 is a schematic structural diagram of a second device according to an embodiment of the present application;

Fig. 21 is an interactive flowchart of an embodiment of the present application;

Fig. 22 is an interactive flowchart of another embodiment of the present application;

Fig. 23 is an interaction flowchart of another embodiment of the present application;

Fig. 24 is an interaction flowchart of another embodiment of the present application;

Fig. 25 is an interaction flowchart of another embodiment of the present application;

Fig. 26 is a schematic structural diagram of another embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are some of the embodiments of the present application, but not all of them.

The embodiment of the present application may be applied to a wireless local area network (Wireless Local Area Network, WLAN). Currently, the standards adopted by the WLAN are Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 series. WLAN can include multiple basic service sets (BasicService Set, BSS), the network node in BSS is a station (Station, STA), and STA includes access point type station access point (Access Point, AP) and non-access point class of stations (none Access Point Station, non-AP STA). Each BSS can include an AP and multiple non-AP STAs associated with the AP.

AP is also called wireless access point or hotspot. AP is the access point for mobile users to enter the wired network. It is mainly deployed in homes, buildings, and campuses. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors. The AP is equivalent to a bridge connecting the wired network and the wireless network. Its main function is to connect various wireless network clients together, and then connect the wireless network to the Ethernet. Specifically, the AP may be a terminal device or a network device with a wireless fidelity (Wireless Fidelity, WiFi) chip. Optionally, the AP may be a device supporting the 802.11ax standard, and further optionally, the AP may be a device supporting multiple WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a or subsequent versions.

The non-AP STA may be a wireless communication chip, a wireless sensor or a wireless communication terminal. For example: mobile phone supporting WiFi communication function, tablet computer supporting WiFi communication function, set-top box supporting WiFi communication function, smart TV supporting WiFi communication function, smart wearable device supporting WiFi communication function, vehicle communication supporting WiFi communication function devices and computers that support WiFi communication. Optionally, the station may support the 802.11ax standard, and further optionally, the station supports multiple WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a or subsequent versions. The non-AP STA may also be referred to as STA for short.

Fig. 1 shows the architecture diagram of the low power consumption wake-up system. A station (Station, STA) introduces an LP-WUR interface on the basis of a traditional WiFi interface (that is, an 802.11 main communication module (main radio)). The LP-WUP of the STA is continuously in the receiving state, or intermittently in the receiving state. When the LP-WUR receives the wake-up packet (Wake-upPacket) from the AP in the receiving state, it sends a wake-up signal to the 802.11 main communication module to wake up The 802.11 main communication module in the dormant state, then communicates with the AP for data. Among them, the AP can also logically include an 802.11 main communication module and a WUR module, but for the current 802.11 standard, the 802.11 main communication module is often an OFDM broadband signal, and the WUR wake-up signal is a narrowband signal, for the sake of cost reduction and simple structure It is contemplated that an OFDM wideband transmitter can be utilized to generate a narrowband WUR wake-up signal. For example, part of the subcarriers of the OFDM signal are vacant and the signal is only transmitted on the narrowband corresponding to the WUR wake-up signal, thereby generating a narrowband signal. This is an example of using an OFDM wideband transmitter to generate a WUR narrowband signal. As shown in Figure 1, the AP only contains one The main communication module for sending and receiving signals.

It should be noted that the 802.11 main communication module and the WUR module can also be implemented separately in the specific implementation of the AP. In addition, both the AP and STA in Figure 1 have only one antenna. This is mainly because the 802.11 main communication module and the WUR module use the same frequency band carrier (for example, 2.4GHz), they can share the same antenna to save costs and simplify the device structure. However, when the 802.11 main communication module and the WUR module use different frequency band carriers, they should be configured with different antennas. For example, the 802.11 main communication module uses the 5GHz frequency band, and the WUR module uses the 2.4GHz frequency band. At this time, the two should correspond to different antennas.

Compared with directly using the 802.11 main communication module, STA can reduce power consumption by using WUR. The main reason is that the reception and decoding of wake-up packets are much simpler than traditional 802.11 frames. The wake-up packet usually adopts a modulation mode that is easy to be demodulated by the receiving end, such as on-off key (OOK) modulation. Taking OOK modulation as an example, the receiving end judges the information carried by the received signal according to the presence or absence of energy, for example, 1 if there is energy, and 0 if there is no energy. The traditional 802.11 frame adopts Orthogonal Frequency Division Multiplexing (OFDM), Binary Convolutional Code (Binary Convolutional Code, BCC)/Low-density Parity Check (Low-density Parity Check, LDPC) at the sending end, etc. , correspondingly, the receiving end needs to perform complex signal processing operations such as Fast Fourier Transform (FFT) and Forward Error Correction (FEC) decoding, and these operations consume a lot of energy.

The 802.11 main radio of the STA in FIG. 1 may also be other communication interfaces, such as Long Term Evolution (Long Term Evolution, LTE). Modules used for data communication are collectively referred to as main communication modules or main radio interfaces (main radio), such as LTE and WiFi modules; modules used for device wake-up are collectively referred to as wake-up radio frequency (WUR) modules or wake-up radio frequency interfaces.

FIG. 2 shows a specific design of a wake-up packet in the prior art. As shown in Figure 2, the old short training field (LegacyShort Training Field, L-STF), the old long training field (Legacy Long Training Field, L-LTF), the old signaling field (Legacy Signal, L-SIG) Corresponding to the preamble part of traditional 802.11, it is used for backward compatibility, and it is sent in OFDM mode on a bandwidth of 20MHz (or an integer multiple of 20MHz), so that traditional WiFi devices can judge that the current packet is a WiFi packet, thereby selecting Corresponding channel sensing decision threshold. If backward compatibility is not considered, L-STF, L-LTF, and L-SIG may not exist. The payload (Payload) part of the wake-up packet adopts a modulation method that is easy to demodulate, such as On-Off Key (OOK) modulation (specifically such as Amplitude Shift Keying (ASK)), which can be used in a narrower bandwidth Uplink transmission, such as 2MHz channel, 4MHz channel, 5MHz channel, etc. (the minimum channel of traditional WiFi is 20MHz), so that the energy consumption of the receiving end is smaller.

The payload (Payload) of the wake-up packet includes a wake-up preamble (Wake-up preamble) and a medium access control (Medium Access Control, MAC) part. The wake-up preamble is similar to the STF and LTF in traditional WiFi, and is used for synchronization, automatic gain control (Automatic Gain Control, AGC) and channel estimation, etc.; the media intervention control part is similar to the MAC part of the traditional WiFi frame, and further includes the MAC header (Header), frame body (Frame Body), frame check sequence (FrameCheck Sequence, FCS), MAC part Simple channel coding may be performed using repetition codes, spreading codes, Manchester codes, etc. to improve reliability, but it is also possible that no channel coding is used. The Wake-up preamble includes a series of specific sequences. The WUR of the STA may not receive the previous Legacy preamble part, but directly detects the specific sequence to identify the start of the wake-up packet. When the WUR of the STA receives the wake-up packet and detects its identity (unicast/multicast/broadcast address) from the MAC part of the wake-up packet, it sends a wake-up signal to the 802.11 main communication module. For the sake of transmission efficiency, Legacy 802.11preamble may not be added to the wake-up packet, and channel coding may not be used in the MAC part. In addition to OOK, the Payload part can also use other modulation methods that are easy to demodulate, such as Frequency Shift Keying (FSK).

If the STA's WUR is activated for a long time, it will obviously consume more power. A compromise is that the WUR is activated intermittently. The appearance of this wake-up window (Wake window) should be regular, so that the AP can know when the WUR of the STA can receive the wake-up packet. For example, WUR is active for 2ms out of every 100ms, as shown in Figure 3. When the AP has data to send to the STA, it can send a wake-up packet in the wake-up window of the STA, thereby waking up the 802.11 main communication module of the STA. Of course, the wake-up window may not be introduced, that is, the WUR of the STA is always in the listening state, which allows the AP to wake up the STA at any time, which is beneficial to reduce the wake-up delay. The disadvantage is that the energy consumption of the STA increases.

The frame structure above can be used not only for wake-up packets, but also for other frames received by the WUR, such as sync frames for synchronization functions. Frames that adopt the above format and can be received by WUR are collectively referred to as WUR frames. Since the function of the WUR frame is relatively simple, the frame body in the MAC part may also not exist.

A Wake-up Preamble frame structure consists of a synchronization signal (Synchronization, SYNC), a starting frame delimiter (Starting Frame Delimiter, SFD), and a signaling field (Signal, SIG), as shown in FIG. 4 . Among them, the synchronization signal is a series of repeated signal waveforms, such as the waveform generated by OOK modulation of 10101010..., and the receiving end realizes clock synchronization based on the detection of repeated waveforms; the start frame delimiter is usually a predefined fixed sequence , used to identify the start position of the frame, that is, when the receiving end completes synchronization based on the synchronization signal, and detects the predefined SFD sequence, it is considered that this is the beginning of a WUR frame; the signaling field is used to carry the MAC part of the control information , such as the length of the MAC part, transmission rate, etc., if the WUR length is fixed and only a specific transmission rate is used, the SIG may not exist.

Since the WUR frame adopts a simple modulation method such as OOK, the receiving end often needs to receive it through non-coherent demodulation. Compared with OFDM modulation and coherent demodulation at the receiving end used by traditional WiFi, the reliability of the WUR frame is worse. In order to ensure high transmission reliability, the transmission of each bit of the WUR frame should take a longer time, that is, the symbol length of each bit is larger. For example, some literature proposes that the symbol length of the WUR frame is 4us, that is, one symbol is transmitted every 4us. It is estimated that the transmission time of a WUR frame may take hundreds of us. On the other hand, because the function of WUR frame is relatively simple, its MAC part is usually short, maybe only a few bytes or a dozen bytes, which leads to a large proportion of Wake-up Preamble in the entire WUR frame. Especially when the MAC part allows higher transmission rates, Wake-up Preamble can only use the lowest rate, and Wake-up Preamble transmission time accounts for a larger proportion of the entire frame transmission time. In short, an excessively long Wake-up Preamble will cause a large waste of media (Media) resources. Here "media" refers to the wireless channel.

Based on the above assumption of the Wake-up Preamble structure, the embodiment of the present invention proposes a method for reducing the length of the Wake-up Preamble, which can shorten the length of the WUR frame as much as possible, thereby reducing waste of media resources and improving media utilization efficiency.

Figure 5 shows the preambles of the two frame formats supported by 802.11b. Among them, the long format in Figure 5(a) is actually the format supported by the original 802.11 standard earlier than 802.11b, 802.11 is compatible with this format, and the SYNC part is a 128bits all 1 sequence; the short format in Figure 5(b) is In the format newly introduced by 802.11b, the SYNC part is a 56-bit all-1 sequence. It can be seen that the technological evolution shortens the length of the synchronization signal. Regardless of 802.11b or original 802.11, the SYNC part in the preamble of the supported frame format is always a fixed length. The length is determined by the most conservative situation, which means that in many cases, such a length of SYNC signal is unnecessary, resulting in a certain waste of resources.

Fig. 6 shows a schematic flowchart of a signal processing method according to an embodiment of the present application.

601. The second device sends a first message to the first device.

In this embodiment of the present application, the first device includes a main communication module, and the second device includes a main communication module and a WUR module, or the first device may further include a WUR module. The first device is a device that sends a wake-up radio frequency frame, and the second device is a device that receives a wake-up radio frequency frame.

For example, the first device may be an AP (such as a router), and the second device may be a STA (such as a mobile phone); or the first device may be an STA (such as a mobile phone), and the second device may be a wearable device, such as a bracelet. The first device and the second device may also be other devices having the above corresponding functions, but the present application is not limited thereto.

The first device may receive the first message through the main communication interface or the WUR interface. The synchronization signal is composed of multiple repeated signal waveforms. The duration of the synchronization signal can be represented by the time domain length of the synchronization signal, or by the number of repeated signal waveforms contained in the synchronization waveform. This application This is not limited.

In some scenarios, two devices may have WUR sending and receiving capabilities at the same time, and the roles of the two devices depend on the current communication scenario. For example, a mobile phone and a wristband may both have WUR sending and receiving capabilities, and both have power-saving requirements, so they can run in WUR mode at the same time, but they need to inform each other of their own wake-up window rules. Specifically, when the mobile phone has data to send to the bracelet, it sends a wake-up packet to the bracelet in the wake-up window of the bracelet. At this time, the mobile phone is the first device and the bracelet is the second device; When the mobile phone sends, the wake-up packet is sent to the mobile phone in the wake-up window of the mobile phone. At this time, the wristband is the first device and the mobile phone is the second device.

It should be understood that in the embodiment of the present application, the WUR module can be represented by the first interface, and the main communication module can be represented by the second interface, and the embodiment of the present application can also not distinguish the WUR module or the WUR interface, and the main communication module and the main communication interface No distinction is made either.

Optionally, as an embodiment, the second device determines the expected duration of the synchronization signal, where the sending the first message by the second device to the first device includes: the second device sending an expected duration carrying the synchronization signal to the first device. Duration of this first message.

As shown in Figure 7, the second device determines the duration of the synchronization signal required to complete the synchronization with the first device (expressed as the expected duration). The duration of the synchronization signal, and report to the first device. The receiving capability of the WUR module itself is usually determined when the device leaves the factory, so it can be reported to the first device as a piece of basic capability information. Alternatively, the second device may also determine the duration of the synchronization signal expected by the second device according to other information, which is not limited in this application.

For example, the first message may be an association request (Association Request)/response frame (Response frame), which includes the expected duration of the synchronization signal, that is, the second device may report the expected synchronization signal length of its own WUR module during the association process. At this time, the first message is transmitted through the second interface (ie, the main communication module).

The second device sends a first message carrying an expected duration to the first device, where the first message may be a management frame, a data frame, or a control frame. For example, as shown in FIG. 8 , the first message is a management frame, and the management frame includes a specially defined synchronization signal element (InformationElement, IE) with a preset length (assuming the expected duration is L ₀ ) for carrying the synchronization signal. The first message is a control frame, carrying L ₀ in the control field of these frames by means of piggyback, and utilizing the high throughput (High Throughput, HT)/very high throughput in the 802.11n/ac/ax data frame (VeryHigh Throughput, VHT)/High Efficiency (HE) control (Control) domain or quality of service (Quality of Service, QoS) Control domain, or the frame (Frame) Control domain of the control frame, etc., to carry the second device expectation The synchronization signal length L ₀ . As shown in Figure 9, use the reserved bits in the Frame Control field of the control frame (such as Request to Send (RTS)/Clear to Send (CTS)/Acknowledge, ACK) etc.) to carry L ₀ , wherein the bit with a value of 0 is a reserved bit and can be used to carry L ₀ .

Optionally, before the first device receives the first message sent by the second device, the first device sends to the second device a third message for measuring the channel quality of the third channel, and the second device determines according to the third message The channel quality measurement result of the third channel, and the expected duration of the synchronization signal is determined according to the channel quality measurement result of the third channel.

It should be noted that, in the embodiment of the present application, for the convenience of distinction and description, the channel used by the second device to send the first message is called the "first channel", and the channel used by the first device to send the third message to the second device The channel is called the "third channel". Wherein, the first channel and the third channel may be the same or different.

The third message may be sent through the first interface or the second interface, and the third message may be a WUR frame, that is, the first device sends a WUR frame, and the second device measures the third channel based on the WUR frame. That is, before the second device sends the first message through the second interface, the first device may send a third message to the second device, where the third message is used to measure the direction from the first device to the second device in the third channel (may be expressed as the channel quality of the first direction), the second device determines the channel quality measurement result of the third channel according to the third message, and estimates the length of the synchronization signal expected by itself (expressed as the expected duration), so as to report to the first device by being carried in the first message.

The channel quality measurement result may be Channel Quality Information (Channel Quality Information, CQI), Channel State Information (Channel State Information, CSI), or Signal-Noise Ratio (Signal-NoiseRatio, SNR), etc.

Optionally, as an embodiment, as shown in FIG. 10 , the first device sends a third message for measuring the channel quality of the third channel to the second device, and the second device determines the third channel according to the third message. The channel quality measurement result of the channel quality measurement result is carried in a first message and sent to the first device.

Specifically, the channel quality measurement result may also be CQI, CSI, or SNR. Specifically, the first message carrying the channel quality measurement result may be a management frame (as shown in FIG. 8 ). The third message may be a special channel measurement message, such as a Null Data Packet (Null Data Packet, NDP) channel sounding message (Sounding). At this time, the first device should also send a measurement notification message before sending the third message, to notify the second device which channels to measure, as shown in Figure 11 (the sending of the subsequent third message is omitted in the figure), it should be noted The measurement notification message that may exist before the third message is not shown in FIG. 10 . This method has high flexibility and can be used even if the main channel of the main communication module is completely different from the WUR channel. For example, the main channel of the main communication module is channel 1, and the WUR channel is in channel 2. If the two channels do not overlap, then the first A device can send measurement notification information on channel 1, instructing the second device to receive NDP Sounding on channel 2 to measure channel 2; the third message can also be other messages sent by the main communication module, such as periodic sending The advantage of this method is that there is no need to send special measurement messages, so the overhead is small.

In this embodiment of the present application, the channel quality measurement result of the first direction of the third channel determined through the third message may be called "explicit feedback". The advantage of "explicit feedback" is that it has higher accuracy. The second device feeds back the channel quality measurement result in the first message, and the channel quality measurement result should at least include the measurement result of the channel used to send the second message (indicated as the second channel). Certainly, the measurement result of the entire channel (that is, the first channel) may also be further included.

Optionally, as an embodiment, the channel quality measurement result may also be equivalently represented by a modulation coding scheme (modulation coding scheme, MCS) recommended by the second device, that is, the second device recommends a MCS, because the MCS generally has a corresponding relationship with the channel quality, so the first device can roughly estimate the approximate channel condition from the first device to the second device according to the MCS recommended by the second device.

For example, in the current 802.11 standard, the second device can piggyback a recommended MCS in the HT Control field of the data frame, and the first device can use the recommended MCS to estimate the preset length. Measuring channels can further reduce overhead.

602. The first device determines the target duration of the synchronization signal according to the first message.

Optionally, if the first message carries the expected duration of the synchronization signal, the first device determines the target duration according to the expected duration.

After the first device receives the expected duration (denoted as L ₀ ) sent by the second device through the second interface or the first interface, it determines the target duration of the synchronization signal (denoted as L) according to L ₀ . L is not less than L ₀ , preferably L=L ₀ . As shown in FIG. 7 , the second message omits the Legacy Preamble that may exist, and similar methods are used in the subsequent illustrations, but the present application is not limited thereto.

Optionally, the first message carries the channel quality measurement result of the third channel, and the first device determines the target duration of the synchronization signal according to the channel quality measurement result.

Before the second device sends the first message through the second interface, the first device sends a third message to the second device, so that the second device measures a third channel according to the third message and obtains a third channel quality measurement result. Subsequently, the second device reports the channel quality measurement result to the first device through the first message. Generally speaking, the better the channel quality, the shorter the target duration; the worse the channel quality, the longer the target duration.

Optionally, as an embodiment, the first device receives the first message sent by the second device on the first channel, and the first device may measure the channel quality of the first channel according to the first message and generate The channel quality measurement result of the first channel may further determine the target duration of the synchronization signal according to the channel quality measurement result of the first channel.

According to the channel reciprocity, it is assumed that the channel quality between the first device and the second device is roughly equivalent in both directions, so the measurement of the first channel (denoted as the second direction) from the second device to the first device The result is regarded as the channel quality measurement result of the first channel (indicated as the first direction) from the first device to the second device, and this manner may be called "implicit feedback". That is to say, the first message is sent by the second device as a channel measurement message, the first device measures the first channel according to the first message and generates a channel quality measurement result, and then determines the target duration of the synchronization signal based on the channel quality measurement result . As shown in FIG. 12 , the channel quality measurement result may specifically be channel quality information (Channel Quality Information, CQI) or channel state information (Channel State Information, CSI), etc. Through "implicit feedback", the channel quality can be learned without sending channel measurement information separately, thereby reducing overhead.

The first message in this embodiment is similar to the third message, and the first message may be a special channel measurement message, such as NDP Sounding, or other frames, such as a data frame, a management frame, or a control frame. The first device measures the channel based on the first message. Similarly, the first message can be sent through the first interface (WUR), or can be sent through the second interface. Considering that the second device often does not have the WUR transmission capability, it is preferable to send the first message through the second interface.

Optionally, the method further includes: the first device receiving receiving capability information sent by the second device, the receiving capability information indicating the receiving capability of the second device for receiving the second message; wherein the first device receives the receiving capability information according to the channel Determining the target duration of the synchronization signal based on the quality measurement result includes: determining, by the first device, the target duration of the synchronization signal according to the channel quality measurement result and the receiving capability information.

Whether the second device determines _L0 based on the channel quality measurement result, or when the first device determines L based on the channel quality measurement result fed back by the second device, it may be necessary to consider the receiving capability information of the second device for receiving the second message (That is, the receiving capability information of the second device receiving the wake-up radio frequency frame), in the embodiment of the present application, the "wake-up radio frequency frame" is expressed as "the second message". The "receiving capability" here may refer to the receiving capability of the second device to receive the same type of second messages (eg, the same frame format) or different types of second messages (eg, different frame formats).

For example, the length of the synchronization signal determined by the first device based on the channel quality measurement result is L ₁ , and the length of the synchronization signal determined based on the WUR receiving capability information of the second device is L ₂ , then the final determined L ₀ or L should be selected from the two The larger one, ie max{L ₁ ,L ₂ }.

Since the synchronization signal length of the WUR frame mainly affects the receiving performance of the second device, and the WUR frame is sent by the first device and received by the second device, the self-receiving capability fed back by the second device and the The measurement results of the channel between the devices are the most direct and accurate for the first device to determine the length of the synchronization signal of the WUR frame.

Optionally, if the second message is a unicast frame, that is, there is only one second device, the first device determines the synchronization signal length L according to the first message sent by the second device; if the second message is a multicast frame or broadcast frames, that is to say, if there are multiple second devices, the first messages fed back by the multiple second devices need to be considered. Specifically, if the recipients of the second message are multiple known devices (for example, the first device is an AP, and the second device is a plurality of STAs associated with the AP), the synchronization signal length L of the second message is It should be considered based on the most conservative of multiple second devices. For example, the L determined by the AP based on the first messages sent by the three STAs are 30, 35, and 27 respectively (unit: number of repeated waveforms), then the AP sends the first message The synchronization signal length of the second message should be the maximum of the three 35; will send the first message like the AP), then the length L of the synchronization signal of the second message should be the maximum allowable value of the length of the synchronization signal, that is, it should be considered according to the most conservative situation.

In addition, the first device determines the target duration according to the channel quality, specifically, the target duration may be determined according to the distance between the first device and the second device, and the transmission power, etc., which reduces the probability that STAs far away receive WUR frames , thereby improving the security of the second message transmission, which is of great significance when applied to wearable devices.

603. The first device generates a second message according to the target duration of the synchronization signal, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration.

The first device determines the target duration of the synchronization signal, and then generates a wake-up radio frequency frame (represented as a second message) according to the frame format of the system. For example, the wake-up radio frequency frame may include a synchronization signal, a starting frame delimiter (Starting FrameDelimiter, SFD) and/or signaling domains etc. The first device may generate wake-up radio frequency frames in different formats for different systems, as long as they include a synchronization signal, and the present application does not limit the format of the wake-up radio frequency frame.

The minimum synchronization signal lengths required by WUR interfaces of different second devices to receive WUR frames may be different. This is due to several reasons:

1. The capabilities of the receivers of different devices are different. For example, the WUR of a mobile phone has high precision and receiving performance, and requires a short synchronization signal to successfully complete synchronization; sensors (such as those used for forest monitoring) must be low in cost due to large-scale deployment, and accordingly, their The configured WUR is less accurate and requires a longer sync signal to complete the sync.

2. The longer the same device is used, the accuracy will decrease due to the aging of the device, and a longer synchronization signal is required to complete the synchronization. For example, the sensor equipment is expected to work for 5-10 years, such a long time, coupled with the possible harsh environment (for example, the sensor in the forest monitoring is exposed to wind, rain and sun), the aging of the device is obvious.

3. With the development and progress of technology, a shorter synchronization signal is required to complete the synchronization function. For example, from the original 802.11 to 802.11b, the synchronization signal length becomes shorter.

4. The influence of distance and transmit power. The shorter the distance between the first device and the second device, the greater the transmission power of the first device, and the smaller the length of the synchronization signal required by the second device to complete synchronization; conversely, the larger the distance, the smaller the transmission power, and the second device completes synchronization. The longer the sync signal length required for synchronization.

Among the above four factors, the capability of the receiver itself is determined when the equipment leaves the factory, and the reduction in the length of the synchronization signal caused by technological progress is also determined when the equipment leaves the factory, so it can be collectively attributed to the capability of the receiver itself (Capability); Changes in the length of the synchronization signal caused by aging, changes in distance, and transmission power can all be attributed to the influence of the channel between the first device and the second device.

On the other hand, the change in the length of the synchronization signal will not lead to an increase in the implementation complexity of the receiver. The receiver does not consider the start of a frame when it detects a predefined number of sync signal repetitions from the received signal, but first detects the predefined repetitions, and after synchronizing based on the detection of the predefined repetitions, then The detection of the signal of the predefined sequence (ie SFD) is considered as the start of the frame. In other words, when the receiver synchronizes based on the synchronization signal, it does not count the number of repeated waveforms, and the determination of the starting position of the frame is determined by the subsequent SFD. The change in the length of the synchronization signal is due to the change in the number of repetitive waveforms contained therein. As long as it is enough for the second device to complete the synchronization, the change in the length of the synchronization signal has no effect on the realization of the second device.

604. The first device sends a second message to the second device.

Optionally, the first device sends the second message to the second device through the first interface, wherein the channel (denoted as the third channel) used by the first device to send the third message to the second device should be able to cover the subsequent sending of the second message. The channel used by the message (for ease of description, the following is referred to as "second channel"). In other words, the second channel used to send the second message may be the third channel, or at least one subchannel of the third channel, that is, the second channel may be all or part of the subchannels of the third channel. channel. For example, the third message is sent using a 20MHz channel, and the second message is sent using a certain 4MHz channel in the 20MHz channel.

Alternatively, the second channel used by the first device to send the second message to the second device may be the first channel used by the second device to send the first message to the first device, or a subchannel of the first channel.

It should be understood that the third channel used by the first device to send the third message to the second device may be the same as or different from the first channel used by the second device to send the first message to the first device. To limit.

605. The second device synchronizes with the first device according to the synchronization signal in the second message.

In the embodiment of the present application, the first device determines the target duration of the synchronization signal and generates the second message after receiving the first message sent by the second device, and then sends the second message to the second device, so that the second device and the first device Synchronization is performed, so that the second message sent by the first device to the second device has a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency.

It should be understood that when there are multiple second devices in the network, the synchronization signals of the second messages sent by the first device to different second devices may be different, but the selected synchronization signal length L must be relatively short but sufficient to support The receiving end is synchronized.

It should also be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above-mentioned processes does not mean the order of execution, and the order of execution of each process should be determined by its functions and internal logic, and should not be used in the implementation of the present invention. The implementation of the examples constitutes no limitation.

Therefore, in the signal processing method of the embodiment of the present application, by receiving the first message sent by the second device, determining the target duration of the synchronization signal according to the first message and generating the second message, sending the second message to the second device for the second device A second message for synchronization with the first device, so that the first device can determine an appropriate target duration of the synchronization signal according to the first message sent by the second device, and send a second message including the target duration of the synchronization signal to the second device , thereby avoiding the waste of channel resources caused by sending the second message including the redundant synchronization signal duration, and improving the utilization rate of channel resources.

Fig. 13 shows an interaction flowchart of a signal processing method according to an embodiment of the present application. The meanings of various terms in the embodiments of the present application are the same as those in the foregoing embodiments.

It should be noted that this is only to help those skilled in the art better understand the embodiments of the present application, but not to limit the scope of the embodiments of the present application.

1301. A first device receives a first message on a first channel, where the first channel includes at least one subchannel.

1302. The first device determines a channel quality measurement result of the first channel according to the first message.

1303. The first device determines the target duration of the synchronization signal according to the channel quality measurement result of the first channel.

1304. The first device generates a second message according to the target duration, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration.

1305. The first device sends the second message to the second device on at least one subchannel in the first channel.

1306. The second device synchronizes with the first device according to the synchronization signal in the second message.

Therefore, in the signal processing method of the embodiment of the present application, the first device receives the first message sent by the second device on the first channel, determines the channel quality measurement result of the first channel according to the first message, and determines the channel quality measurement result of the first channel according to the first channel The channel quality measurement result determines the target duration of the synchronization signal to generate a second message, and sends the second message for the second device to synchronize with the first device to the second device on the sub-channel of the first channel, so that the first device can be synchronized according to Using the first message as a measurement message to determine the channel quality measurement result, and determining an appropriate target duration of the synchronization signal according to the channel quality measurement result, and sending a second message including the target duration of the synchronization signal to the second device, thereby avoiding sending The waste of channel resources caused by the second message including the redundant synchronization signal duration increases the utilization rate of channel resources.

Fig. 14 shows an interaction flowchart of a signal processing method according to another embodiment of the present application. The meanings of various terms in the embodiments of the present application are the same as those in the foregoing embodiments.

It should be noted that this is only to help those skilled in the art better understand the embodiments of the present application, but not to limit the scope of the embodiments of the present application.

1401. The first device sends a third message on a third channel, where the third channel includes at least one subchannel.

1402. The second device measures the channel quality measurement result of the third channel according to the third message.

1403. The second device determines a preset length of the synchronization signal according to the channel quality measurement result of the third channel.

1404. The second device sends the first message carrying the expected duration.

1405. The first device determines the target duration according to the expected duration.

1406. The first device generates a second message according to the target duration, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration.

1407. The first device sends the second message to the second device on a subchannel of the third channel.

1408. The second device synchronizes with the first device according to the synchronization signal in the second message.

Therefore, in the signal processing method of the embodiment of the present application, the first device sends to the second device a third message for performing channel measurement on the third channel, so that the second device determines the channel quality of the third channel according to the third message measurement result, and determine the expected duration of the synchronization signal required by the second device according to the channel quality measurement result, the second device sends a first message carrying the expected duration of the synchronization signal to the first device, and the first device The expected duration determines the target duration of the synchronization signal and generates a second message, and the first device sends the second message to the second device for the second device to synchronize with the first device, so that the first device can The expected duration of the signal determines an appropriate target duration of the synchronization signal, and sends a second message including the target duration of the synchronization signal to the second device, thereby avoiding the channel resources caused by sending the second message including the redundant synchronization signal duration waste, improving channel resource utilization.

Fig. 15 shows an interactive flowchart of a signal processing method according to another embodiment of the present application. The meanings of various terms in the embodiments of the present application are the same as those in the foregoing embodiments.

It should be noted that this is only to help those skilled in the art better understand the embodiments of the present application, but not to limit the scope of the embodiments of the present application.

1501. The second device receives a third message sent by the first device on a third channel, where the third message is used to measure channel quality of the third channel, where the third channel includes at least one subchannel.

1502. The second device determines the channel quality measurement result of the third channel according to the third message.

1503. The second device sends the first message carrying the channel quality measurement result to the first device.

1504. The first device determines the target duration according to the channel quality measurement result.

1505. The first device generates a second message according to the target duration, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration.

1506. The first device sends the second message to the second device on a subchannel of the third channel.

1507. The second device synchronizes with the first device according to the synchronization signal in the second message.

Therefore, in the signal processing method of the embodiment of the present application, the first device sends to the second device a third message for performing channel measurement on the third channel, so that the second device determines the channel quality of the third channel according to the third message measurement results, the second device sends a first message carrying the channel quality measurement result to the first device, the first device determines the target duration of the synchronization signal according to the channel quality measurement result and generates a second message, and the first device sends the second message to the second device Sending a second message for the second device to synchronize with the first device, so that the first device can determine an appropriate target duration of the synchronization signal according to the channel quality measurement result sent by the second device, and send the second message including the synchronization signal to the second device The second message with the target duration of the second message, thereby avoiding the waste of channel resources caused by sending the second message including the redundant synchronization signal duration, and improving the utilization rate of channel resources.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

The signal processing method according to the embodiment of the present application has been described in detail above, and the signal processing device according to the embodiment of the present application will be described below.

Fig. 16 shows a schematic block diagram of a first device according to an embodiment of the present application. As shown in Figure 16, the first device 1600 includes:

a receiving module 1610, configured to receive the first message sent by the second device;

A processing module 1620, configured to determine the target duration of the synchronization signal according to the first message received by the receiving module 1610;

The processing module 1620 is further configured to generate a second message according to the target duration of the synchronization signal determined by the processing module 1620, the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration;

A sending module 1630, configured to send the second message generated by the processing module 1620 to the second device.

Therefore, the first device in the embodiment of the present application, by receiving the first message sent by the second device, determines the target duration of the synchronization signal and generates a second message, the second message includes the synchronization signal, and the second message includes The duration of the synchronization signal is the target duration, and then the second message is sent to the second device, so that the second device is synchronized with the first device, so that the second message sent by the first device to the second device has a relatively short but The synchronization signal is enough for the second device to complete the synchronization function, thereby reducing the waste of media resources and improving the efficiency of media utilization.

Optionally, the first message carries the expected duration of the synchronization signal, and the expected duration of the synchronization signal indicates the duration of the synchronization signal required for the second device to complete synchronization with the first device; the processing module 1620 is specifically used to : According to the expected duration, determine the target duration of the synchronization signal, where the target duration is not less than the expected duration.

Optionally, the sending module 1630 is further configured to send a third message to the second device on the first channel, so that the second device measures the channel quality of the first channel according to the third message, and generates the first channel The channel quality measurement result of the first channel, and determine the expected duration of the synchronization signal according to the channel quality measurement result of the first channel.

Optionally, the receiving module 1610 is further configured for the first device to receive the first message sent by the second device on a first channel; the processing module 1620 is specifically configured to: measure the first channel according to the first message and generate a channel quality measurement result of the first channel; and determine a target duration of the synchronization signal according to the channel quality measurement result of the first channel.

Optionally, the sending module 1630 is further configured to send a third message to the second device on the first channel, where the third message is used by the second device to measure the channel quality of the first channel and generate the channel quality of the first channel. Channel quality measurement result; the first message carries the channel quality measurement result of the first channel; the processing module 1620 is specifically configured to: determine the target duration of the synchronization signal according to the channel quality measurement result of the first channel.

Optionally, the receiving module 1610 is further configured to receive receiving capability information sent by the second device, where the receiving capability information indicates the receiving capability of the second device to receive the second message; the processing module 1620 is specifically configured to: according to the first The channel quality measurement result of a channel and the receiving capability information determine the target duration of the synchronization signal.

Optionally, the first channel includes at least one subchannel; the sending module 1630 is specifically configured to: send the second message to the second device on at least one subchannel in the first channel.

Therefore, the first device in the embodiment of the present application, by receiving the first message sent by the second device, determines the target duration of the synchronization signal and generates a second message, the second message includes the synchronization signal, and the second message includes The duration of the synchronization signal is the target duration, and the second message is sent to the second device, so that the second device is synchronized with the first device, so that the second message sent by the first device to the second device has a relatively short but The synchronization signal is enough for the second device to complete the synchronization function, thereby reducing the waste of media resources and improving the efficiency of media utilization.

The first device according to the embodiment of the present application may correspond to the execution body of the signal processing method according to the embodiment of the present application, and the above-mentioned and other operations and/or functions of the various modules in the first device are for realizing the above-mentioned respective methods For the sake of brevity, the corresponding process is not repeated here.

Fig. 17 shows a schematic block diagram of a first device according to an embodiment of the present application. As shown in Figure 17, the second device 1700 includes:

The sending module 1710 is configured to send a first message to the first device, the first message is used by the first device to determine the target duration of the synchronization signal, and generate a second message, the second message includes the synchronization signal, and the synchronization signal The duration of is the target duration;

a receiving module 1720, configured to receive the second message sent by the first device;

The processing module 1730 is configured to synchronize with the first device according to the synchronization signal in the second message.

Therefore, the second device in the embodiment of the present application sends the first message to the first device, so that the first device determines the target duration of the synchronization signal according to the first message, and generates the second message according to the target duration. The second message includes a synchronization signal, and the duration of the synchronization signal included in the second message is the target duration, and then receives the second message sent by the first device, and the second device communicates with the first device according to the synchronization signal in the second message Synchronization is performed, so that the second message received by the second device is a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency.

Optionally, the processing module 1730 is also configured to determine an expected duration of the synchronization signal, where the expected duration of the synchronization signal indicates the duration of the synchronization signal required for the second device to complete synchronization with the first device; the sending module 1710 It is specifically used for: sending the first message carrying the expected duration of the synchronization signal to the first device.

Optionally, the receiving module 1720 is also used for the second device to receive a third message, and the third message is used for measuring the channel quality of the first channel; the processing module 1730 is also used for determining the first channel quality according to the third message. The channel quality measurement result of the channel; the processing module 1730 is specifically configured to: determine the expected duration of the synchronization signal according to the channel quality measurement result of the first channel.

Optionally, the receiving module 1720 is further configured to receive a third message, the third message is used to measure the channel quality of the first channel; the processing module 1730 is further configured to determine the channel quality of the first channel according to the third message Quality measurement result; the processing module 1730 is specifically configured to: send the first message carrying the channel quality measurement result of the first channel to the first device.

Therefore, the second device in the embodiment of the present application sends the first message to the first device, so that the first device determines the target duration of the synchronization signal according to the first message, and generates the second message according to the target duration. The second message includes a synchronization signal, and the duration of the synchronization signal included in the second message is the target duration, and then receives the second message sent by the first device, and the second device communicates with the first device according to the synchronization signal in the second message Synchronization is performed, so that the second message received by the second device is a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency.

The second device according to the embodiment of the present application may correspond to the execution body of the signal processing method according to the embodiment of the present application, and the above-mentioned and other operations and/or functions of the various modules in the second device are respectively in order to realize the above-mentioned various methods For the sake of brevity, the corresponding process is not repeated here.

FIG. 18 shows a signal processing system 1800 according to an embodiment of the present application. The system 1800 includes:

The first device 1600 in the embodiment shown in FIG. 16 and the second device 1700 in the embodiment shown in FIG. 17 .

Fig. 19 shows a schematic structural diagram of a first device provided by an embodiment of the present application. As shown in FIG. 19 , the first device includes at least one processor 1902 (such as a general-purpose processor CPU with computing and processing capabilities, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array ( FPGA), etc.), the processor 1902 is used to manage and schedule each module and device in the first device. The processing module 1620 in the embodiment shown in FIG. 16 may be implemented by the processor 1902 . The first device also includes at least one transceiver 1905 (receiver/transmitter 1905 ), memory 1906 , and at least one bus system 1903 . The receiving module 1610 and the sending module 1630 in the embodiment shown in FIG. 16 may be implemented by a transceiver 1905 . The various components of the first device are coupled together through the bus system 1903, wherein the bus system 1903 may include a data bus, a power bus, a control bus, and a status signal bus, etc., but for the sake of clarity, all the buses are marked as Bus system 1903.

The methods disclosed in the foregoing embodiments of the present application may be applied to the processor 1902, or used to execute an executable module stored in the memory 1906, such as a computer program. The memory 1906 may include a high-speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory (non-volatile memory). The memory may include a read-only memory and a random access memory, and provides Required signaling or data, programs, etc. A portion of the memory may also include non-volatile random access memory (NVRAM). The communication connection with at least one other network element is realized through at least one transceiver 1905 (which may be wired or wireless).

In some implementations, the memory 1906 stores a program 19061, and the processor 1902 executes the program 19061 for performing the following operations:

receiving the first message sent by the second device through the transceiver 1905;

determining the target duration of the synchronization signal according to the first message;

generating a second message according to the target duration of the synchronization signal, the second message including the synchronization signal, and the duration of the synchronization signal being the target duration;

Send the second message to the second device through the transceiver 1905.

It should be noted that the first device may specifically be the first device in the embodiment shown in FIG. 16 , and may be used to execute the method embodiments shown in FIG. 6 , FIG. 13 , FIG. 14 and FIG. Various steps and/or processes corresponding to a device.

It can be seen from the above technical solutions provided by the embodiments of the present application that the first device determines the target duration of the synchronization signal and generates a second message after receiving the first message sent by the second device, the second message includes the synchronization signal, and The duration of the synchronization signal included in the second message is the target duration, and then the second message is sent to the second device, so that the second device is synchronized with the first device, so that the second message sent by the first device to the second device The synchronization signal is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency.

FIG. 20 shows a schematic structural diagram of a second device provided by an embodiment of the present application. As shown in FIG. 20 , the second device includes at least one processor 2002 (for example, a general-purpose processor CPU with computing and processing capabilities, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array ( FPGA), etc.), the processor 2002 is used to manage and schedule each module and device in the second device. The processing module 1730 in the embodiment shown in FIG. 17 may be implemented by the processor 2002 . The second device also includes at least one transceiver 2005 (receiver/transmitter 2005 ), memory 2006 , and at least one bus system 2003 . The receiving module 1720 and the sending module 1710 in the embodiment shown in FIG. 17 may be implemented by a transceiver 2005 . The various components of the second device are coupled together through the bus system 2003, wherein the bus system 2003 may include a data bus, a power bus, a control bus, and a status signal bus, etc., but for the sake of clarity, various buses are marked as Bus system 2003.

The methods disclosed in the foregoing embodiments of the present application may be applied to the processor 2002, or used to execute an executable module stored in the memory 2006, such as a computer program. The memory 2006 may include a high-speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory (non-volatile memory). The memory may include a read-only memory and a random access memory, and provides Required signaling or data, programs, etc. A portion of the memory may also include non-volatile random access memory (NVRAM). The communication connection with at least one other network element is realized through at least one transceiver 2005 (which may be wired or wireless).

In some implementations, the memory 2006 stores a program 20061, and the processor 2002 executes the program 20061 for performing the following operations:

Send a first message to the first device through the transceiver 2005, the first message is used for the first device to determine the target duration of the synchronization signal, and generate a second message, the second message includes the synchronization signal, the duration of the synchronization signal for the target duration;

receiving the second message sent by the first device through the transceiver 2005;

The second device synchronizes with the first device according to the synchronization signal in the second message.

It should be noted that the second device may specifically be the second device in the embodiment shown in FIG. 17 , and may be used to execute the method embodiments shown in FIG. 6 , FIG. 13 , FIG. 14 and FIG. Each step and/or process corresponding to the second device.

It can be seen from the above technical solutions provided by the embodiments of the present application that the second device sends the first message to the first device, so that the first device determines the target duration of the synchronization signal according to the first message, and generates a synchronization signal according to the target duration. The second message, the second message includes a synchronization signal, and the duration of the synchronization signal included in the second message is the target duration, and then receives the second message sent by the first device, and the second device according to the second message in the second message The synchronization signal is synchronized with the first device, so that the second message received by the second device is a relatively short synchronization signal that is sufficient for the second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency.

The embodiment of the present application also provides a computer storage medium, and the computer storage medium can store program instructions for instructing any one of the above methods.

Optionally, the storage medium may specifically be the memory 1906 or 2006.

It should be noted that this application claims the priority of the earlier application, the entire content of which is incorporated in this application by reference. The meanings of the following various terms are the same as those of the foregoing embodiments.

The embodiment of the present invention aims at the problem that the Wake-up Preamble accounts for a large proportion in the WUR frame, and proposes a method for reducing the Wake-up Preamble, which can shorten the length of the WUR frame as much as possible, thereby reducing the waste of media resources and improving media utilization efficiency .

In an embodiment of the present invention: the first device receives the first message sent by the second device through the first interface or the second interface, and determines the synchronization signal length L based on the first message; the first device generates the second message, and the second The second message includes the first synchronization signal, and the length of the first synchronization signal is L; the first device sends the second message to the second device through the first interface. The signaling interaction and processing flow of this embodiment is shown in FIG. 21 .

It should be noted that the "synchronization signal length" here corresponds to the "target duration of the synchronization signal" in the above-mentioned embodiments.

The embodiment of the present invention enables the second message sent by the first device to the second device to have a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency. When there are multiple second devices in the network, the synchronization signals of the second messages sent by the first device to different second devices may be different, but the length L of the selected synchronization signal must be relatively short but sufficient to support the completion of the receiving end. Synchronous.

In the embodiment of the present invention, the first interface may be WUR, and correspondingly, the second message may be a WUR frame. The first message may be received through the first interface or the second interface of the first device, and the second interface may be a main communication interface, that is, a WiFi interface or other high-speed communication interfaces, such as LTE. If the first device has no WUR receiving capability, or the second device has no WUR sending capability, the first message can only be transmitted through the first interface.

Wherein, the first device is a device that sends a WUR frame, and the second device is a device that receives a WUR frame. For example, the first device may be an AP, such as a router, and the second device may be a STA, such as a mobile phone; the first device may also be an STA, such as a mobile phone, and the second device may be a wearable device, such as a smart phone or a bracelet. In some scenarios, two devices may have WUR sending and receiving capabilities at the same time, and the roles of the two devices depend on the current communication scenario. For example, a mobile phone and a wristband may both have WUR sending and receiving capabilities, and both have power-saving requirements, so they can run in WUR mode at the same time, but they need to inform each other of their own wake-up window rules. Specifically, when the mobile phone has data to send to the bracelet, it sends a wake-up packet to the bracelet in the wake-up window of the bracelet. At this time, the mobile phone is the first device and the bracelet is the second device; When the mobile phone sends, the wake-up packet is sent to the mobile phone in the wake-up window of the mobile phone. At this time, the wristband is the first device and the mobile phone is the second device.

The first synchronization signal is composed of a plurality of repeated signal waveforms. The length L of the first synchronization signal may be the time domain length of the first synchronization signal, or may be the number of repeated signal waveforms included in the first synchronization waveform. The substantive meanings of the two are the same, and both are used to describe the duration of the first synchronization signal.

The first message is a feedback message, and the first device determines, according to the feedback message from the second device, the length of the synchronization signal used when sending the WUR frame (the second message). The reason why the length of the synchronization signal of the WUR frame sent to the second device can be changed is mainly due to two reasons:

On the one hand, the minimum synchronization signal lengths required by WUR interfaces of different second devices to receive WUR frames may be different. This is due to several reasons:

A. The capabilities of the receivers of different devices are different. For example, the WUR of a mobile phone has high precision and receiving performance, and requires a short synchronization signal to successfully complete synchronization; sensors (such as those used for forest monitoring) must be low in cost due to large-scale deployment, and accordingly, their The configured WUR is less accurate and requires a longer sync signal to complete the sync.

B. The longer the same device is used, the accuracy will decrease due to device aging, and a longer synchronization signal is required to complete the synchronization. For example, the sensor equipment is expected to work for 5-10 years, such a long time, coupled with the possible harsh environment (for example, the sensor in the forest monitoring is exposed to wind, rain and sun), the aging of the device is obvious.

C. With the development and progress of technology, the required shorter synchronization signal can complete the synchronization function. For example, from the original 802.11 to 802.11b, the synchronization signal length becomes shorter.

D. Effect of distance and transmit power. The shorter the distance between the first device and the second device, the greater the transmission power of the first device to send the second message, the smaller the length of the synchronization signal required for the second device to complete synchronization; conversely, the larger the distance, the smaller the transmission power, The longer the length of the synchronization signal required by the second device to complete the synchronization.

Among the above four factors, the capability of the receiver itself is determined when the equipment leaves the factory, and the reduction in the length of the synchronization signal caused by technological progress is also determined when the equipment leaves the factory, so it can be attributed to the capability of the receiver itself (Capability); device aging , the change of the length of the synchronization signal caused by the change of the distance and the transmission power can all be attributed to the influence of the channel between the first device and the second device.

On the other hand, the change in the length of the synchronization signal will not lead to an increase in the implementation complexity of the receiver. The receiver does not consider the start of a frame when it detects a predefined number of sync signal repetitions from the received signal, but first detects the predefined repetitions, and after synchronizing based on the detection of the predefined repetitions, then The detection of the signal of the predefined sequence (ie SFD) is considered as the start of the frame. In other words, when the receiver synchronizes based on the synchronization signal, it does not count the number of repeated waveforms, and the determination of the starting position of the frame is determined by the subsequent SFD. The change in the length of the synchronization signal is due to the change in the number of repetitive waveforms contained in it. As long as it is enough for the receiving end to complete the synchronization, the change in the length of the synchronization signal has no effect on the realization of the receiving end.

It should be noted that if the second message is a unicast frame, that is, there is only one second device, the synchronization signal length L of the second message only depends on the first message fed back by the second device; If there are multiple broadcast frames or broadcast frames, that is, there are multiple second devices, it is necessary to consider the first messages fed back by each of the multiple second devices. Specifically, if the expected receiving object of the second message is a plurality of known devices (for example, the first device is an AP, and the second device is a plurality of STAs associated with the AP), the synchronization signal length of the second message L should be considered according to the most conservative one among multiple second devices. For example, the L determined by the AP based on the first messages sent by the three STAs are respectively 30, 35, and 27 (unit: the number of repeated waveforms), then the AP sends The length of the synchronization signal of the second message should be the maximum of the three 35; Or it will not send the first message like the AP), then the synchronization signal length L of the second message should be the maximum allowable value of the synchronization signal length, that is, it is considered according to the most conservative situation.

Embodiment 1: The first message is an explicit feedback message

The second device feeds back its expected first synchronization signal length L0 to the first device through the first message, or feeds back channel state information from the first device to the second device. In this embodiment, the first message is transmitted through the second interface (main radio).

Specifically, it includes two situations:

1) The second device determines the expected length L0 of the first synchronization signal based on the capability of its own first interface (WUR interface), and reports it to the first device.

The receiving capability of the WUR interface itself is usually determined when the device leaves the factory, so it can be reported to the first device as a piece of basic capability information. For example, the first message is an Association Request/Response frame, which includes the expected first synchronization signal length L ₀ , that is, the second device reports the expected synchronization signal length L ₀ of its own WUR receiver during the association process. At this time, the first message is transmitted through the second interface (ie, the main communication interface).

After receiving the first message sent by the second device through the second interface, the first device determines the length L of the synchronization signal according to L ₀ reported therein. L is not less than L ₀ , preferably L=L ₀ . Subsequently, the first device uses L for the transmission of the second message on the first interface.

The above process is shown in Figure 21. Note that for ease of illustration, the second message in FIG. 7 omits possible Legacy Preamble. The subsequent diagrams all adopt similar methods, and details will not be repeated here. Figure 22 is the signaling interaction and processing flow of this solution.

2) The second device measures the channel, and feeds back the channel measurement result or L ₀ determined based on the channel measurement result to the first device through the first message.

Before the second device sends the first message through the second interface, the first device sends a third message to the second device, so that the second device measures a channel based on the third message and obtains a channel measurement result. Subsequently, the second device reports the channel measurement result to the first device through the first message, or the second device estimates the length L ₀ of the synchronization signal expected by its own first interface (WUR interface) based on the channel measurement result, and sends the result through the first The message is reported to the first device.

In this embodiment, the channel measurement result may specifically be Channel Quality Information (Channel Quality Information, CQI), Channel State Information (Channel State Information, CSI), or Signal-Noise Ratio (Signal-Noise Ratio, SNR), etc. In addition, the channel measurement result may also be equivalently represented by a recommended MCS, that is, the second device recommends an MCS in the first message for use when the first device sends a message to the second device. Since the MCS generally has a corresponding relationship with the channel quality, the first device can roughly estimate the approximate channel condition from the first device to the second device based on the MCS recommended by the second device, and then determine the synchronization signal length L ₀ . In the current 802.11 standard, the receiving end can piggyback the recommended MCS in the HT Control field of the data frame to achieve the purpose of MCS feedback. This embodiment can use the recommended MCS to estimate L ₀ , so that no special measurement is required The process can measure the channel, which can further reduce the overhead.

If the second device reports the expected synchronization signal length L ₀ through the first message, the first device determines the synchronization signal length L according to L ₀ , as shown in FIG. 10 , and its signaling interaction and processing flow are shown in FIG. 23 . L is not less than L ₀ , preferably L=L ₀ .

If the second device reports the channel measurement result through the first message, the first device determines the synchronization signal length L based on the channel measurement result, as shown in FIG. 11 , and its signaling interaction and processing flow are shown in FIG. 24 . Generally speaking, the better the channel quality, the smaller L is; the worse the channel quality is, the larger L is. Subsequently, the first device uses L for the transmission of the second message on the first interface.

The third message may be sent through the first interface, that is, the first device sends a WUR frame, and the second device measures the channel based on the WUR frame.

The third message may also be sent through the second interface. At this time, the channel used for sending the third message (called the first channel) should be able to cover the channel used for sending the second message (called the second channel), that is, the channel used for sending the second message (called the second channel). The second channel is a sub-channel of the first channel. For example, the third message is sent using a 20MHz channel, and the second message is sent using a certain 4MHz channel in the 20MHz channel. If the second device feeds back the channel measurement result in the first message, the channel measurement result should at least include the measurement result of the channel used to send the second message (for example, the aforementioned 4 MHz channel). Of course, the measurement results of the entire channel (for example, the aforementioned 20 MHz channel) may also be further included.

The third message may be a special channel measurement message, such as NDP Sounding. At this time, the first device should also send a measurement notification message before sending the third message to notify which STAs measure which channels, as shown in FIG. 11 ( The sending of the subsequent third message is omitted in the figure), and it should be noted that the measurement notification message that may exist before the third message is not shown in FIG. 10 and FIG. 23 . This method has high flexibility and can be used even if the main channel of the main radio is completely different from the WUR channel. For example, the main channel of the main radio is channel 1, and the WUR channel is in channel 2. If the two channels do not overlap, the first device can Send measurement notification information in channel 1, instructing the second device to receive NDP Sounding on channel 2 to measure channel 2; the third message can also be other messages sent by the main radio, such as Beacon frames sent periodically, The advantage of this method is that there is no need to send special measurement messages, so the overhead is small. However, since the main radio must use the main channel, if the WUR channel does not overlap with the main radio main channel, this method may be difficult to use.

When the second device feeds back the channel measurement result through the first message, the first message should be a management frame, which carries the channel measurement result. However, in the case where the second device feeds back the expected synchronization signal length _L0 through the first message in this embodiment, the first message may also be a management frame, which contains a specially defined information element for carrying the synchronization signal length _L0 ( Information Element, IE), the synchronization signal IE shown in Figure 8; the first message can also be a data frame or a control frame, and carries L ₀ in the control field of these frames by means of piggyback, for example, using 802.11 The HT/VHT/HE Control field or QoS Control field in the n/ac/ax data frame, or the Frame Control field in the control frame, etc., carry the synchronization signal length L ₀ expected by the second device. FIG. 9 is an example of carrying L ₀ by using reserved bits in the Frame Control field of a control frame (such as RTS/CTS/ACK, etc.), where the bit with a value of 0 is a reserved bit and can be used to carry L ₀ .

It should be noted that whether the second device determines _L0 based on the channel measurement result or when the first device determines L based on the channel measurement result fed back by the second device, the WUR reception capability of the second device may need to be considered. For example, the length of the synchronization signal determined based on the channel measurement result is L ₁ , and the length of the synchronization signal determined based on the WUR receiving capability of the second device is L ₂ , then the final determined L ₀ or L should be the larger of the two, That is max{L ₁ ,L ₂ }.

Explicit feedback has the advantage of greater accuracy. Since the synchronization signal length of the WUR frame mainly affects the receiving performance of the receiving end, and the WUR frame is sent by the first device and received by the second device, the self-receiving capability fed back by the second device and the distance between the first device and the second device The measurement results of the inter-channel are the most direct and accurate for the first device to determine the length of the synchronization signal of the WUR frame. The main disadvantage of this embodiment is that the measurement and feedback process is somewhat expensive.

Embodiment 2: The first message is an implicit feedback message

The so-called implicit feedback means that according to channel reciprocity, it is assumed that the channel quality between the first device and the second device is roughly equivalent in both directions, so the measurement result of the channel from the second device to the first device is regarded as is the channel measurement result from the first device to the second device. At this time, the channel measurement message (that is, the first message) is sent by the second device, and the first device measures the channel based on the message, and estimates the synchronization signal length L based on the channel measurement result. As shown in Figure 12. Specifically, the channel measurement result may be CQI or CSI. Fig. 25 is a signaling interaction and processing flow of this embodiment.

The first message in this embodiment is similar to the third message in Embodiment 1, and the receiving end measures the channel based on the message. Similarly, the first message can be sent through the first interface (WUR) or through the second interface (mainradio). Considering that the second device often does not have the WUR transmission capability, it is preferable to send the first message through the second interface. At this time, the channel used by the first message sent on the second interface (called the third channel) should be able to cover the channel used by the subsequent second message sent (called the second channel), that is, the second channel is A subchannel of the third channel. For example, the first message is sent using a 20MHz channel, and the second message is sent using a certain 4MHz channel in the 20MHz channel. The first message may be a special channel measurement message, such as NDP Sounding; it may also be other frames, such as a data frame, a management frame or a control frame sent by the second device to the first device.

Similar to Embodiment 1, it should be noted that when the first device determines L based on the channel measurement result obtained by measuring the first message, it may need to consider the WUR reception capability of the second device, and the reception capability of the second device may be It is fed back in advance, such as using the Association Request/Response frame in the association process to feed back.

For example, the length of the synchronization signal determined based on the channel measurement result is L ₁ , and the length of the synchronization signal determined based on the WUR receiving capability of the second device is L ₂ , then the final determined L ₀ or L should be the larger of the two, That is max{L ₁ ,L ₂ }.

The advantage of implicit feedback is that the overhead is small, and only one channel measurement message is needed; the disadvantage is that the channel quality of the reverse channel (the channel from the second device to the first device) is equivalent to that of the forward channel (the channel from the first device to the first device). The channel quality of the channel of the second device may not be accurate enough in some cases, which may affect the accuracy of L determined by the first device, and further affect the performance of the second device receiving the second message.

Embodiment three

An embodiment of the present invention provides a first device, which can be used in the above embodiments to execute various steps and/or processes corresponding to the first device in the above method embodiments. The specific structure may be the structure of the first device as shown in FIG. 26 , where the module 300 corresponds to the first device. For the first device 300 , it includes submodules 301 , 302 , 303 , 304 and 305 . The first device receives the first message sent by the second device through the first interface 301 or the second interface 302, and determines the synchronization sequence length L based on the first message in the processor 303; the processor 303 generates a second message, and the second message contains the first synchronization signal, and the length of the first synchronization signal is L; the first device sends the second message to the second device through the first interface 301 . In FIG. 26, the sub-module 301 corresponds to the first interface, which may be provided by the WUR. The sub-module 302 corresponds to the second transceiver of the device to be awakened, that is, the second interface, which may be provided by a main radio (for example, 802.11 main radio). The sub-module 303 corresponds to a processor (can be one or more), and can realize the aforementioned functions of determining L according to the first message and generating the second message, that is, both the determination unit and the generation unit in claim 7 can be realized by the processor 303 . The sub-module 304 corresponds to the memory (there may be one or more). The submodule 303 and the submodule 304 may be shared by the first interface and the second interface.

In the example shown in FIG. 26, the first interface 301 and the second interface 302 may share the same antenna sub-module 305, mainly for the consideration of reducing the hardware cost of the device and simple implementation. The first interface 301 and the second interface 302 may also correspond to different antennas, especially when they work on different frequency bands, for example, they work on the 2.4GHz frequency band and the 5GHz frequency band respectively. In an actual product, the first device 300 may be implemented by a system on a chip (System on a Chip, SoC) or an integrated circuit.

The embodiment of the present application can shorten the length of the WUR frame, so that the WUR sent by the AP to each user has the shortest synchronization signal, thereby reducing waste and improving system efficiency; and the length of the synchronization sequence can be adjusted according to the distance and transmission power, reducing the number of distant first The probability of three-party STA receiving WUR frame, thus improving the security of WUR transmission, which is especially meaningful for wearable devices.

In addition, the embodiment of the present invention also provides the following embodiments numbered as 13-22. The numbering is only for convenience, and the numbering starts from 13, which does not necessarily mean that there is a specific relationship with the numbering of the previously provided embodiments. Relation, embodiment 13-22 is specifically as follows:

13. The first device according to embodiment 12, wherein the first message carries an expected duration of the synchronization signal, and the expected duration indicates that the second device completes synchronization with the first device The duration of the synchronization signal required;

The processing module is specifically used for:

The target duration is determined according to the expected duration, and the target duration is greater than or equal to the expected duration.

14. The first device according to embodiment 13, wherein the sending module is further configured to send a third message to the second device on the first channel, so that the second device sends a third message according to the first message The third message measures the channel quality of the first channel to generate a channel quality measurement result of the first channel, and determines the expected duration according to the channel quality measurement result of the first channel.

15. The first device according to embodiment 12, wherein the receiving module is further configured for the first device to receive the first message sent by the second device on a first channel;

The processing module is specifically used for:

measuring the channel quality of the first channel and generating a channel quality measurement result of the first channel according to the first message;

Determine the target duration according to the channel quality measurement result of the first channel.

16. The first device according to embodiment 12, wherein the sending module is further configured to send a third message to the second device on the first channel, and the third message is used for the second The device measures channel quality of the first channel and generates a channel quality measurement result of the first channel;

The first message carries a channel quality measurement result of the first channel;

The processing module is specifically used for:

Determine the target duration according to the channel quality measurement result of the first channel.

17. The first device according to embodiment 15 or 16, wherein the receiving module is further configured to receive receiving capability information sent by the second device, and the receiving capability information indicates that the second device receives the receiving capability of the second message;

The processing module is specifically used for:

The target duration is determined according to the channel quality measurement result of the first channel and the receiving capability information.

18. The first device according to any one of embodiments 14 to 16, wherein the first channel includes at least one sub-channel;

The sending module is specifically used for:

The second message is sent to the second device on at least one subchannel of the first channel.

19. A second device, comprising:

a sending module, configured to send a first message to the first device, the first message is used by the first device to determine the target duration of the synchronization signal, and generate a second message, the second message includes the synchronization signal, The duration of the synchronization signal is the target duration;

a receiving module, configured to receive the second message sent by the first device;

A processing module, configured to synchronize with the first device according to the synchronization signal in the second message.

20. The second device according to embodiment 19, wherein the processing module is further configured to determine an expected duration of the synchronization signal, and the expected duration indicates that the second device completes communication with the first device The duration of the synchronization signal required for synchronization;

The sending module is specifically used for:

sending the first message carrying the expected duration to the first device.

21. The second device according to embodiment 20, wherein the receiving module is further used for the second device to receive a third message, and the third message is used to measure the channel quality of the first channel;

The processing module is further configured to determine a channel quality measurement result of the first channel according to the third message;

The processing module is specifically used for:

The expected duration is determined according to the channel quality measurement result of the first channel.

22. The second device according to embodiment 19, wherein the receiving module is further configured to receive a third message, and the third message is used to measure the channel quality of the first channel;

The processing module is further configured to determine a channel quality measurement result of the first channel according to the third message;

The processing module is specifically used for:

sending the first message carrying the channel quality measurement result of the first channel to the first device.

It should be understood that the specific examples in the present application are only to help those skilled in the art better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application.

It should be understood that the term "and/or" in this article is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B may mean: A exists alone, and A and B exist at the same time , there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or can be Integrate into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (13)

1. A kind of 1. method of signal transacting, it is characterised in that including：

   First equipment receives the first message that the second equipment is sent；

   First equipment determines the target duration of synchronizing signal according to the first message；

   First equipment generates the second message, second message includes the synchronizing signal, institute according to the target duration State when a length of target duration of synchronizing signal；

   First equipment sends second message to second equipment.
2. 2. according to the method for claim 1, it is characterised in that when the first message carries the expectation of the synchronizing signal It is long, it is described it is expected that duration represents that second equipment completes the duration of required synchronizing signal synchronous with first equipment；

   Wherein, according to the first message, determine the target duration of synchronizing signal includes first equipment：

   First equipment determines the target duration, the target duration is more than or equal to the phase according to the expectation duration Hope duration.
3. 3. according to the method for claim 2, it is characterised in that receive what second equipment was sent in first equipment Before the first message, methods described also includes：

   First equipment sends the 3rd message in the first channel to second equipment, so that second equipment is according to 3rd message measures the channel quality of first channel to generate the channel quality measurements of first channel, and according to The channel quality measurements of first channel determine the expectation duration.
4. 4. according to the method for claim 1, it is characterised in that first equipment receives first that the second equipment is sent and disappeared Breath includes：

   First equipment receives the first message of the second equipment transmission in the first channel；

   Wherein, according to the first message, determine the target duration of synchronizing signal includes first equipment：

   First equipment measures the channel quality of first channel and generates first channel according to the first message Channel quality measurements；

   First equipment determines the target duration according to the channel quality measurements of first channel.
5. 5. according to the method for claim 1, it is characterised in that receive what second equipment was sent in first equipment Before the first message, methods described also includes：

   First equipment sends the 3rd message in the first channel to second equipment, and the 3rd message is used for described second The channel quality of first channel described in device measuring and the channel quality measurements for generating first channel；

   The first message carries the channel quality measurements of first channel；

   Wherein, according to the first message, determine the target duration of synchronizing signal includes first equipment：

   First equipment determines the target duration according to the channel quality measurements of first channel.
6. 6. the method according to claim 4 or 5, it is characterised in that receive the second equipment hair in first equipment Before the first message sent, methods described also includes：

   First equipment receives the receiving ability information that second equipment is sent, and the receiving ability information represents described the Two equipment receive the receiving ability of the second message；

   Wherein, first equipment is according to the channel quality measurements of first channel, when determining the target of synchronizing signal Length includes：

   Channel quality measurements and the receiving ability information of first equipment according to first channel, it is determined that described Target duration.
7. 7. the method according to any one of claim 3 to 5, it is characterised in that first channel includes at least one Subchannel；

   Wherein, first equipment sends second message to second equipment and included：

   First equipment sends described second at least one subchannel in first channel to second equipment Message.
8. A kind of 8. method of signal transacting, it is characterised in that including：

   Second equipment sends first message to the first equipment, and the first message determines synchronizing signal for first equipment Target duration, and generate the second message, second message includes the synchronizing signal, the synchronizing signal when it is a length of described in Target duration；

   Second equipment receives second message that first equipment is sent；

   Synchronizing signal of second equipment in second message, is synchronized with first equipment.
9. 9. according to the method for claim 8, it is characterised in that methods described also includes：

   Second equipment determines the expectation duration of synchronizing signal, the expectation duration represent second equipment complete with it is described The duration of the required synchronizing signal of the synchronization of first equipment；

   Wherein, second equipment sends first message to the first equipment and included：

   Second equipment is sent to first equipment carries the first message for it is expected duration.
10. 10. according to the method for claim 9, it is characterised in that methods described also includes：

    Second equipment receives the 3rd message, and the 3rd message is used for the channel quality for measuring the first channel；

    Second equipment determines the channel quality measurements of first channel according to the 3rd message；

    Wherein, second equipment determines that the expectation duration of the synchronizing signal includes：

    Second equipment determines the expectation duration according to the channel quality measurements of first channel.
11. 11. according to the method for claim 8, it is characterised in that methods described also includes：

    Second equipment receives the 3rd message, and the 3rd message is used for the channel quality for measuring the first channel；

    Second equipment determines the channel quality measurements of first channel according to the 3rd message；

    Wherein, second equipment sends first message to the first equipment and included：

    Second equipment sends described the of the channel quality measurements that carry first channel to first equipment One message.
12. A kind of 12. first equipment, it is characterised in that including：

    Receiving module, the first message sent for receiving the second equipment；

    Processing module, for the first message received according to the receiving module, determine the target duration of synchronizing signal；

    The processing module, the target duration determined according to the processing module is additionally operable to, generates the second message, described the Two message include the synchronizing signal, when a length of target duration of the synchronizing signal；

    Sending module, for sending second message of the processing module generation to second equipment.
13. A kind of 13. second equipment, it is characterised in that including：

    Sending module, for sending first message to the first equipment, the first message is used for first equipment and determined synchronously The target duration of signal, and the second message is generated, second message includes the synchronizing signal, the duration of the synchronizing signal For the target duration；

    Receiving module, second message sent for receiving first equipment；

    Processing module, for the synchronizing signal in second message, synchronized with first equipment.