CN110875787A - Wireless communication method and system for realizing high-reliability low-delay transmission - Google Patents
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Abstract
The invention provides a wireless communication method for realizing high-reliability low-delay transmission, which comprises the following steps: copying the service data to be sent to obtain at least two service data; respectively sending the at least two service data through M transmission channels; the receiving end receives the transmitted data in N channels to recover the original service data, wherein N is an integer greater than 2. The invention also provides a corresponding wireless communication system. The invention solves the difficulty of system design supporting high reliability and low time delay, improves the reliability index of the service through flexible system frame structure design, flexible frame configuration and multi-channel transmission strategy combination.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a wireless communication method and a wireless communication system for realizing high-reliability low-delay transmission.
Background
In recent years, the demand of the human society for wireless communication is rapidly increasing, and from providing interconnection between people, it is developed to provide interconnection between everything, such as internet of things, car networking, industrial internet, and the like. An important premise of the internet of everything is that a wireless communication system needs to achieve high reliability and low delay at the same time, and the existing wireless communication technologies, including a WiFi technology based on 802.11 standards, a Bluetooth system based on 802.15, and a mobile communication system LTE/LTE-a/3GPP 5G, cannot meet such requirements. Wireless network technologies are available.
The IEEE 802.11-based WiFi technology is one of the most widely used wireless network transmission technologies today. The method is mainly applied to the wireless local area network environment, the application scenes are more indoor, and the method can also be applied to the outdoor environment. The 802.11 system evolved from the original 802.11b based CDMA transmission scheme to 802.11a and 802.11g based OFDM technology. For a traditional WLAN system, a single-user access MAC layer design based on CSMA/CA (carrier sense and collision avoidance) is always a bottleneck of network performance, and subsequent evolution versions 802.11n/11ac only perform large bandwidth extension through MIMO, MU-MIMO, bandwidth extension and the like, and do not see thorough improvement of bottom layer reliability performance. Due to the existence of the CSMA/CA mechanism, the WiFi technology is easily interfered, the reliability is poor, the transmission delay cannot be guaranteed, and the requirements of a high-bandwidth and high-reliability system which is rapidly developed in the future are difficult to adapt.
Existing 3GPP LTE/LTE-a, and 5G systems are mainly designed for large capacity, high throughput, and rely mainly on HARQ mechanisms to improve reliability. In the HARQ mechanism, the receiver combines information retransmitted for multiple times to improve reliability, but transmission delay inevitably increases, and storing information retransmitted for multiple times also increases complexity and cost greatly.
Therefore, the existing commercial wireless communication systems such as LTE/LTE-a/3GPP 5G and WLAN cannot provide both ultra-high reliability and ultra-low delay characteristics.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for wireless data transmission, which solve the problems of high reliability and low delay of the system and achieve the goal of high throughput.
The invention provides a wireless communication method and a system for realizing high-reliability low-delay transmission, which comprises the following steps:
copying the service data to be sent to obtain M parts of service data, wherein M is an integer greater than 2;
respectively sending the M service data through M transmission channels;
the receiving end receives the transmitted data in N channels to recover the original service data, wherein N is an integer greater than 2.
Preferably, the channel is a sub-channel that divides an operating bandwidth according to a predetermined specification.
Preferably, the channels are located in different sub-frames in the same physical frame.
Preferably, the length of the sub-frame can be set to be different time periods, and different attributive services are respectively configured to the sub-frames with different time periods according to the service characteristics.
Preferably, the frame length is 2 milliseconds, 1 millisecond or 0.5 millisecond.
Preferably, the channel is a radio frequency channel constructed by M different antennas, and the M antennas cooperatively transmit the M pieces of same service data.
Preferably, the channel is a channel constructed by M different nodes, and the M nodes cooperatively transmit the M pieces of same service data.
The invention also provides a wireless communication system for realizing high-reliability low-delay transmission, which comprises:
the system comprises a sending end device, a receiving end device and a sending end device, wherein the sending end device is used for copying service data to be sent to obtain M parts of service data, and M is an integer greater than 2; respectively sending the M service data through M transmission channels;
and the receiving end device is used for receiving the sent data in N channels and recovering the original service data, wherein N is an integer greater than 2.
The channel is a sub-channel which divides the working bandwidth according to a preset specification.
The channels are located in different subframes in the same physical frame.
The wireless data transmission system also comprises a frame length setting module which is positioned at the sending end and used for setting the length of the sub-frame;
the frame length setting module can set the length of the sub-frame to be different time length periods, and different attributive services are respectively configured to the sub-frames with different time lengths according to the service characteristics.
Preferably, M different antennas are provided at the transmitting end;
the channel is a radio frequency channel constructed by the M different antennas, and is used for cooperatively transmitting the M identical service data.
The wireless data transmission system further comprises M node devices;
the channel is constructed by the M node devices and is used for cooperatively sending the M pieces of same service data.
In summary, the present invention solves the difficulty of system design supporting high reliability and low time delay, and improves the reliability index of the service through flexible system frame structure design, flexible frame configuration, and multi-channel transmission strategy combination.
For the purposes of the foregoing and related ends, the one or more embodiments include the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings and the disclosed embodiments are intended to include all such aspects and their equivalents.
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FIGS. 1a, 1b and 1c are schematic diagrams of the frame structure of the present invention;
FIG. 2 is a flow chart of a wireless data transmission method according to the present invention;
FIG. 3 is a schematic diagram of the implementation principle of the technical solution provided by the present invention;
FIG. 4 is a diagram illustrating channel division according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of an implementation of a third embodiment of the invention;
fig. 6 is a schematic diagram of an implementation scheme of a fourth embodiment of the invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
In order to make the principles, features and advantages of the present invention more apparent, a detailed description of specific embodiments is provided below.
Self-contained protocol designs for ultra-high throughput wireless communication systems are retained.
In the wireless communication system adopting the self-packet frame, the system signaling completely indicates the physical resource allocation condition in the frame, and the current frame is indicated to carry out feedback and data frame confirmation, thereby greatly reducing the system delay.
The configuration setting of the dynamic physical frame structure of the ultra-high throughput wireless communication system is reserved, the frame length configuration can be flexibly carried out, the configuration granularity reaches the symbol level, the scheduling resource granularity and the time delay performance can be guaranteed, if the frame length of 1ms or even 0.5ms is adopted, ultra-low system time delay can be realized, and the actual measurement end-to-end time delay can be lower than 1 ms.
The support of the sub-channel of the ultra-high throughput wireless communication system is reserved, 5/10/20MHz can be used as the sub-channel to be configured according to the scene, and the corresponding system sub-carrier interval is 19.53125KHz/39.0625KHz/78.125 KHz. For the control information such as the broadcast and the like which are key to the system, a subchannel copy mode can be adopted to improve the reliability requirement of the control signaling of the whole system.
Multiple dimensions can be utilized for multi-channel transmission, and a system design idea of self-contained frames is combined, for example, different time slots (time dimension), different sub-channels (frequency dimension), multiple antennas (space domain dimension) and multiple nodes (system dimension, such as system multi-terminal reception) are adopted for multi-channel transmission. By supporting the transmission of the multiple dimensions, the requirement of high reliability is met, and the requirement of low time delay is considered.
The scheduling of time, sub-channels and multi-antenna domains can be flexibly realized, so that the channel transmission reliability is improved from various angles. In addition, from the system design point of view, the system-level reliability can be provided by simultaneously and jointly performing system reception through multiple terminals.
An optimized channel coding strategy (LDPC coding) is designed aiming at the targets of high reliability and low time delay, and the system reliability can be further improved.
The structure of a self-contained frame is described herein, as shown in FIG. 1 a.
And configuring a control channel in the frame structure, wherein the control channel is used for bearing description information of one or more channels of the uplink transmission channel, the downlink transmission channel, the uplink sounding channel, the downlink sounding channel, the CQI feedback channel, the CSI feedback channel, the uplink scheduling request channel and the random access channel. Thereby informing the STA associated with the CAP of the specific transmission resource allocation of each channel in the frame structure.
The control channel is composed of a scheduling signaling, and the description information is carried in the scheduling signaling. The scheduling signaling is used for indicating an object of resource scheduling and transmission resources scheduled for the object; the object is one or a group of station STAs.
The scheduled resource type may be one or more combinations of time division, frequency division, code division, and space division. Therefore, each channel in the configured frame structure may multiplex resources in one or more combinations of time division, frequency division, code division, and space division.
To more specifically describe the frame structure configuration method of the present invention, referring to fig. 1a, this figure shows a frame structure including a downlink subframe and an uplink subframe, where the downlink subframe includes a preamble sequence, a system information channel, a control channel, a downlink transmission channel, and a downlink sounding channel, the uplink subframe includes an uplink sounding channel, an uplink scheduling request channel, an uplink transmission channel, and an uplink random access channel, and a guard interval GI is configured between the uplink subframe and the downlink subframe. And the transmission resources are shared among all the channels in a time division multiplexing mode.
Fig. 1a shows only an example of a frame structure, and in practical cases, corresponding channels are dynamically configured in the frame structure according to different application scenarios or schemes of the system. In addition, the resource multiplexing method between the channels is determined by the type of the scheduled resource, for example, as shown in fig. 1b, the uplink transport channel (which may include an uplink traffic transport channel, an uplink signaling channel, a downlink traffic feedback channel, etc.), the uplink scheduling request channel, and the uplink random access channel may adopt frequency division and time division hybrid multiplexing. For another example, as shown in fig. 1c, on the basis of fig. 1b, the system information channel and the control channel may be multiplexed by frequency division and time division. In addition, the transmission resources may be shared among the resources allocated to the STAs in the same channel by using a multiplexing scheme of one or a combination of time division, frequency division, code division, and space division. The downlink probing channel shown in fig. 1b and 1c is located in the middle of the downlink transmission channel, and the downlink transmission channel is divided into a downlink transmission channel 1 and a downlink transmission channel 2.
As can be seen from the above, in the self-packet frame, the control signaling indicates that the resource allocation is valid in the frame:
DL-CCH indicates the downlink resource allocation of the current frame, and the current frame takes effect; UL-CCH indicates that the uplink resource allocation of the current frame is effective;
in some cases, the feedback, the resources acknowledged, and the frame in effect may also be indicated directly.
In the ultra-high throughput wireless communication system adopting the self-packet frame, the system signaling completely indicates the physical resource allocation condition in the frame, and the current frame indicating the current frame can be fed back and confirmed by the data frame, so that the system response time is greatly reduced, and the aim of low time delay is fulfilled.
As shown in fig. 2, a wireless communication method for implementing high-reliability low-delay transmission provided by the present invention includes the following steps:
s21, copying the service data to be sent to obtain M parts of service data, wherein M is an integer greater than 2;
s22, sending the M service data through M transmission channels;
s23, the receiving end receives the transmitted data in N channels to recover the original service data, where N is an integer greater than 2.
Referring to fig. 3, the central access point CAP transmits the same data to the station STA through a plurality of channels.
Example one
In a broadband mobile communication system, multi-channel transmission can be carried out by using a plurality of subchannels which are frequency domain dimensions, and the same data is copied and transmitted by the plurality of subchannels, so that the reliability of the system is improved.
According to the support of the sub-channel by the EUHT system, 5/10/20MHz can be configured as the sub-channel according to the scenario. The subchannel duplication mode can be adopted to improve the control signaling reliability requirement of the whole system.
The CAP occupies M basic sub-channels, modulates and codes data and copies the data to the M basic sub-channels for transmission, and the SAT combines and receives the data transmitted by the CAP in the range of the N basic sub-channels.
Specifically, the channel is a sub-channel that divides an operating bandwidth according to a predetermined specification.
The available bandwidth of 80MHz is divided into 4 subchannels of 20MHz as shown in fig. 4.
The system information and the control signaling are duplicated and sent in 4 sub-channels, and the reliability is improved. Any other service needing to improve reliability can be transmitted in at least two sub-channels by adopting a short signaling sub-channel duplication mode.
The sub-channels can be flexibly configured, for example, the 20MHz sub-channel is subdivided into 10MHz or 5MHz sub-channels.
If the available bandwidth is 100MHz, the available bandwidth may be divided into 1 80MHz (including 4 20MHz subchannels) and 1 20MHz (including 4 5MHz subchannels) to form a joint system for transmission, which is suitable for different scenarios. The transmitted traffic data may be concurrent on multiple sub-channels.
Example two
In particular, the multiple channels are located in different subframes in the same physical frame.
The length of the sub-frame can be set to be different time length periods, and different attributive services are respectively configured to the sub-frames with different time lengths according to service characteristics.
The subframes with different lengths can be flexibly configured, for example, the subframe length is 2 milliseconds, 1 millisecond or 0.5 millisecond, the subframes with different lengths are mixed and combined, different attributive services enter different subframe length configuration periods, and the real-time performance and the throughput rate are considered.
The frame with fixed length of 2ms, 1ms and 0.5ms can be supported;
for example, 10ms may be distributed in 2ms and 21 ms intervals;
alternatively, 10ms are distributed in 2ms, 1ms, 2 0.5ms intervals.
EXAMPLE III
The channel is a radio frequency channel constructed by N different antennas, and the N antennas cooperatively transmit the M parts of the same service data.
Referring to fig. 5, after the data stream of the CAP is coded and modulated, multiple copies of the data stream are obtained by copying, and the multiple copies are sent out from different antennas, and the STA separates received signals through a spatial equalizer, and then demodulates and decodes the received signals, and combines different received signals of the data stream to recover the original data stream, thereby improving the reliability of the transmitted data.
In a new generation of 5G communication system, how large antenna array structure a Transmission Receiving Point (TRP) is configured, which results in different characteristics of beams formed by different antennas. Therefore, more flexible and efficient cooperation is needed between the antennas to meet the requirement of a New Radio (NR) of 5G.
Example four
In a broadband mobile communication system, multi-channel transmission can be carried out by utilizing node domain dimensionality, namely a plurality of nodes, and the plurality of nodes cooperatively send the same data, so that the reliability of the system is improved.
As shown in fig. 6, a multi-CAP cooperative transmission mode is adopted, a plurality of channels are channels constructed by N different nodes, and the N nodes cooperatively transmit the same service data.
And a plurality of CAPs can be utilized for cooperative transmission, so that the reliability of system data is improved. The plurality of CAPs copy the same data to be sent, and the STA end combines and receives the data sent by the plurality of CAPs to recover the original data stream.
In addition, an embodiment of the present invention further provides a wireless communication system for implementing high-reliability low-latency transmission, including:
the system comprises a sending end device, a receiving end device and a sending end device, wherein the sending end device is used for copying service data to be sent to obtain M parts of service data, and M is an integer greater than 2; respectively sending the M service data through M transmission channels;
and the receiving end device is used for receiving the sent data in N channels and recovering the original service data, wherein N is an integer greater than 2.
The channel is a sub-channel which divides the working bandwidth according to a preset specification.
The channels are located in different subframes in the same physical frame.
The wireless data transmission system further comprises:
the frame length setting module is positioned at the sending end and used for setting the length of the subframe;
the frame length setting module can set the length of the sub-frame to be different time length periods, and different attributive services are respectively configured to the sub-frames with different time lengths according to the service characteristics.
M different antennas are arranged at a sending end;
the channel is a radio frequency channel constructed by the M different antennas, and is used for cooperatively transmitting the M identical service data.
The wireless data transmission system also comprises M node devices;
the channel is constructed by the M node devices and is used for cooperatively sending the M pieces of same service data.
The system may further improve reliability using LDPC coding.
A system level backup redundancy scheme is employed to provide reliability.
By using the broadcast attribute of the service, the terminals can perform mutual correction after receiving the service, thereby improving reliability.
Compared with the scheme in the prior art, the invention has the following advantages:
in an ultra-high throughput wireless communication system, multi-channel transmission is performed by using multiple dimensions, and a system design idea of a self-contained frame is combined, for example, multi-channel transmission is performed by using different time slots (time dimension), different subchannels (frequency dimension), multiple antennas (spatial domain dimension) and multiple nodes (system dimension, such as system multi-terminal reception). By supporting the transmission of the multiple dimensions, the requirement of high reliability is met, and the requirement of low time delay is considered.
Those of skill in the art will understand that the various exemplary method steps and apparatus elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative steps and elements have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method described in connection with the embodiments disclosed above may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a subscriber station. In the alternative, the processor and the storage medium may reside as discrete components in a subscriber station.
The disclosed embodiments are provided to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope or spirit of the invention. The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. A wireless communication method for realizing high-reliability low-delay transmission is characterized by comprising the following steps:
copying the service data to be sent to obtain M parts of service data, wherein M is an integer greater than 2;
respectively sending the M service data through M transmission channels;
the receiving end receives the transmitted data in N channels to recover the original service data, wherein N is an integer greater than 2.
2. The wireless data transmission method of claim 1,
the channel is a sub-channel which divides the working bandwidth according to a preset specification.
3. The wireless data transmission method of claim 1,
the channels are located in different subframes in the same physical frame.
4. The method for wireless data transmission according to claim 3, wherein the length of the sub-frame is set to different time periods, and different services belonging to different time periods are configured to the sub-frames with different time periods respectively according to the service characteristics.
5. The method of wireless data transmission according to claim 4, wherein the frame length is 2 milliseconds, 1 millisecond, or 0.5 millisecond.
6. The wireless data transmission method of claim 1,
the channel is a radio frequency channel constructed by M different antennas, and the M antennas cooperatively transmit the M identical service data.
7. The wireless data transmission method of claim 1,
the channel is constructed by M different nodes, and the M nodes cooperatively send the M same service data.
8. A wireless communication system for implementing high reliability low latency transmissions, comprising:
the system comprises a sending end device, a receiving end device and a sending end device, wherein the sending end device is used for copying service data to be sent to obtain M parts of service data, and M is an integer greater than 2; respectively sending the M service data through M transmission channels;
and the receiving end device is used for receiving the sent data in N channels and recovering the original service data, wherein N is an integer greater than 2.
9. The wireless communication system of claim 8,
the channel is a sub-channel which divides the working bandwidth according to a preset specification.
10. The wireless communication system of claim 8,
the channels are located in different subframes in the same physical frame.
11. The wireless communication system of claim 10, further comprising:
the frame length setting module is positioned at the sending end and used for setting the length of the subframe;
the frame length setting module can set the length of the sub-frame to be different time length periods, and different attributive services are respectively configured to the sub-frames with different time lengths according to the service characteristics.
12. The wireless communication system of claim 8, wherein M different antennas are provided at a transmitting end;
the channel is a radio frequency channel constructed by the M different antennas, and is used for cooperatively transmitting the M identical service data.
13. The wireless communication system of claim 8, further comprising M node devices;
the channel is constructed by the M node devices and is used for cooperatively sending the M pieces of same service data.
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| CN114697970A (en) * | 2022-04-02 | 2022-07-01 | 辽宁工控科技有限公司 | Wireless network system for tunnel type scene |
| WO2024152482A1 (en) * | 2023-01-17 | 2024-07-25 | 深圳市汇川技术股份有限公司 | Method, apparatus and device for signal transmission in communication system, and storage medium |
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| CN103430608B (en) * | 2011-03-25 | 2017-06-23 | 北京新岸线移动多媒体技术有限公司 | Device for wireless communications |
| WO2016015213A1 (en) * | 2014-07-29 | 2016-02-04 | Panasonic Intellectual Property Corporation Of America | Conveying number of required harq repetitions for coverage enhancement |
| CN106464709A (en) * | 2014-12-29 | 2017-02-22 | 华为技术有限公司 | Method, apparatus and device for sending and receiving transmission frame |
| CN104486045A (en) * | 2014-12-31 | 2015-04-01 | 电子科技大学 | Wireless data communication method under condition that channel has remarkable fluctuations |
| CN106464581A (en) * | 2016-07-29 | 2017-02-22 | 深圳市道通智能航空技术有限公司 | Data transmission method and system and data receiving device |
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| CN114697970A (en) * | 2022-04-02 | 2022-07-01 | 辽宁工控科技有限公司 | Wireless network system for tunnel type scene |
| WO2024152482A1 (en) * | 2023-01-17 | 2024-07-25 | 深圳市汇川技术股份有限公司 | Method, apparatus and device for signal transmission in communication system, and storage medium |
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