CN107182092B - Method and device for transmitting channel sounding signal SRS - Google Patents

Abstract

The present invention provides a method and device for sending a channel sounding signal SRS. The terminal of the present invention sends the channel sounding signal SRS to a base station. The sending method of the SRS includes one of the following: the SRS is sent as a component signal of the discovery signal DRS. ;The SRS and DRS are sent in the same subframe or adjacent subframes; the SRS and the downlink channel or signal are multiplexed and sent in the same subframe; the downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS; according to restrictions or The modified SRS subframe configuration, or sequence number configuration, or transmission configuration is used to send the SRS, which solves the problem of not being able to measure uplink and downlink channel status information in a timely and effective manner, and improves the spectrum usage efficiency of unlicensed carriers.

Description

Method and device for transmitting channel sounding signal SRS

Technical field

The present invention relates to the field of communications, and specifically, to a method and device for transmitting a channel sounding signal SRS.

Background technique

LTE uses unlicensed carriers (Long Term Evolution–Unlicensed, referred to as LTE-U) refers to deploying LTE in unlicensed carriers to meet the growing capacity requirements of wireless communication systems and improve the use efficiency of unlicensed spectrum. LTE and a possible important evolution direction of future wireless communications. When designing LTE-U, it is necessary to consider how to use unlicensed carriers to transmit data in a fair and friendly manner with different systems such as Wireless Fidelity (WiFi) and radar, as well as the same LTE-U system. Possibly without affecting and retaining LTE technical characteristics. According to the 3rd Generation Partnership Project (3GPP) standards meeting, the LTE-U system in the Rel-13/14 version can also be called LTE LicensedAssisted Access to unlicensed spectrum, referred to as LAA) system. In addition, there is an unlicensed carrier device that can interact with the UE on its own without the need for authorized carrier-assisted access. It is generally called a standalone communication (Standalone) device.

There are two ways to measure the downlink channel state information (DL CSI). The first is that the user equipment (User Equipment, UE) measures the downlink reference signal (DownlinkReference Signal, DL RS for short). Dedicated reference signal (Cell-specific ReferenceSignal, referred to as CRS) or channel state information reference signal (Channel State Information ReferenceSignal, referred to as CSI-RS) is measured, and then the CSI measurement results are reported to the base station. The second is that the base station sends a signal to the UE Measure the SRS and use the channel heterogeneity to obtain DL CSI. The former will introduce a larger measurement feedback delay (4ms). In unlicensed carrier communication, this delay may be further amplified. On the one hand, delay It will affect the scheduling on the base station side, and on the other hand, it will also affect the accuracy of CSI measurement. Therefore, using uplink SRS to obtain uplink and downlink CSI is a more effective method, but how to send SRS in the unlicensed spectrum is a problem.

Regarding the problem in related technologies that the uplink and downlink channel condition information cannot be measured in a timely and effective manner, there is currently no effective technical solution to solve it.

Contents of the invention

The present invention provides a method and device for transmitting a channel sounding signal SRS in an unlicensed carrier, so as to at least solve the problem in related technologies that uplink and downlink channel condition information cannot be measured in a timely and effective manner.

According to one aspect of the present invention, a method for sending a channel detection signal is provided, including:

The terminal sends a channel sounding signal (Sounding Reference Signal, SRS for short) to the base station, where the SRS sending method includes one of the following:

The SRS is sent as a component signal of a discovery signal (Demodulation Reference Signal, referred to as DRS);

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, or sequence number configuration, or transmission configuration.

Further, the SRS as a component signal of the discovery signal DRS includes:

The SRS is a necessary component signal of the DRS, or the SRS is a configurable signal in the DRS.

Further, in the case where the SRS is sent as a component signal of the DRS,

The SRS is located on the blank symbol of the DRS; and/or,

The duration of the DRS is set to 13 symbols in the transmission subframe where the DRS is located, and the SRS is located on the 13th symbol of the transmission subframe where the DRS is located; or, the duration of the DRS is set to the last symbol of the previous transmission subframe in the two adjacent transmission subframes where the DRS is located and the 12 symbols of the later transmission subframe in the two adjacent transmission subframes, and the SRS is located On the last symbol of the previous sending subframe in the two adjacent sending subframes; and/or,

The duration of the DRS is set to 14 symbols in the transmission subframe where the DRS is located, and the SRS is located on the 14th symbol of the transmission subframe where the DRS is located; or, the duration of the DRS The SRS is set to the last two symbols of the previous one of the two adjacent transmission subframes in which the DRS is located and the 12 symbols of the latter one of the two adjacent transmission subframes. Located on the penultimate symbol of the previous transmission subframe among the two adjacent transmission subframes.

Further, when the SRS and DRS are transmitted in the same subframe or adjacent subframes,

The SRS is sent on the blank symbols of the DRS; and/or,

The SRS is sent on the 13th symbol or the 14th symbol in the sending subframe where the DRS is located; and/or,

The SRS is sent in a subframe preceding the sending subframe in which the DRS is located.

Further, when the SRS and the DRS are sent in the same subframe or adjacent subframes, LBT is executed once, and the SRS and the DRS are sent according to the execution result of the LBT.

Further, when the SRS is sent as a component signal of the DRS, or the SRS and the DRS are sent in the same subframe or adjacent subframes, the configuration parameters of the SRS are modified or restricted so that the SRS The sending position is located in the DRS measurement timing configuration DMTC subframe or DRS subframe, wherein the configuration parameters include at least one of the following: subframe configuration, configuration sequence number, period, and offset.

Further, when the SRS is sent as a component signal of the discovery signal DRS, the configuration parameters of the SRS are the same as the DRS or measurement timing configuration (DRS measurement timing configuration, DMTC for short), wherein the configuration parameters Includes: period and/or offset.

Further, when the SRS and the downlink channel or signal are sent in the same subframe, the terminal is a terminal scheduled by the downlink channel, or the terminal is not a terminal scheduled by the downlink channel.

Further, when the SRS and the downlink channel or signal are sent in the same subframe, the last symbol or a specific symbol of the subframe multiplexed by the downlink channel is reserved or determined to be used for sending the SRS, where , the downlink channel or signal is not mapped to the last symbol or specific symbol of the subframe.

Further, in the case where the SRS is sent in the same subframe as the downlink channel or signal, the SRS is sent in the last symbol of the subframe multiplexed with the downlink channel, wherein the SRS is measured in the channel state information The reference signal CSI-RS or the downlink user-specific reference signal UE-specific RS is not transmitted on the symbols or subframes occupied.

Further, sending the SRS according to the restricted or modified SRS subframe configuration includes:

Configuring each subframe in the radio frame as a transmission subframe that allows transmission of the SRS; or

Each uplink subframe in the radio frame is configured as a transmission subframe that allows transmission of the SRS.

Further, sending the SRS according to the restricted or modified sequence number configuration includes:

Limit or modify the transmission cycle and/or transmission offset used to transmit the SRS;

The SRS is transmitted using a restricted or modified transmission period and/or transmission offset.

Further, sending the SRS according to the restricted or modified sending configuration includes:

In the case where the terminal receives an SRS transmission request in subframe n, the terminal starts transmitting the SRS on the first idle subframe that meets the following conditions:

The first idle subframe is the n+kth subframe, where k is greater than or equal to 4;

The first idle subframe is the first idle subframe for uplink transmission, or the first idle subframe is the first subframe in which the terminal is scheduled to send the uplink physical shared channel PUSCH, or, The first idle subframe is a sending subframe that meets the preset SRS subframe configuration requirements, wherein the preset SRS subframe configuration requirements include: configuring each subframe in the radio frame to allow the SRS to be sent. a transmission subframe; or configure each uplink subframe in the radio frame as a transmission subframe that allows transmission of the SRS; or configure a restricted or modified transmission period and/or transmission offset for transmitting the SRS SRS transmission subframe;

Further, before the terminal sends the channel sounding signal SRS to the base station, it also includes:

The terminal receives downlink control signaling sent by the base station, wherein the downlink control signaling satisfies at least one of the following formats: DCI format 0, DCI format 4, DCI format 1A, DCI format 2B, DCI format 2C; so The downlink control signaling includes at least one of the following fields: SRS period, SRS offset, SRS single transmission, SRS multiple transmissions in the preset burst, SRS periodic transmission according to opportunities after triggering, SRS The duration of sending and SRS sending delay.

Further, before the terminal sends the channel sounding signal SRS to the base station, it also includes:

The terminal receives downlink control signaling sent by the base station, wherein the downlink control signaling satisfies at least one of the following formats: DCI format 1C, DCI format 3A, DCI format 3C; the downlink control signaling includes the following At least one of the fields: SRS subframe set, SRS transmission pattern, SRS cycle, SRS offset, SRS transmission duration, and indication information indicating whether SRS is transmitted.

According to another aspect of the present invention, a method for sending a channel sounding signal SRS is also provided, including:

The base station sends the transmission configuration information of the channel sounding signal SRS to the terminal, wherein the transmission method of the SRS in the transmission configuration information includes one of the following:

The SRS is sent as a component signal of the discovery signal DRS;

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, or sequence number configuration, or transmission configuration.

Further, before the base station sends the transmission configuration information of the channel sounding signal SRS to the terminal, the method further includes:

Downlink control signaling sent by the base station to the terminal, wherein the downlink control signaling satisfies at least one of the following formats: DCI format 0, DCI format 4, DCI format 1A, DCI format 2B, DCI format 2C ; The downlink control signaling includes at least one of the following fields: SRS period, SRS offset, SRS single transmission, SRS multiple transmissions in the preset burst, and SRS periodic transmission according to opportunities after triggering , the duration of SRS transmission, and the SRS transmission delay.

According to another aspect of the present invention, a device for sending a channel sounding signal SRS is also provided, which is located in a terminal and includes:

A sending module, configured to send a channel sounding signal SRS to the base station, where the sending method of the SRS includes one of the following:

The SRS is sent as a component signal of the discovery signal DRS;

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, or sequence number configuration, or transmission configuration.

According to another aspect of the present invention, a device for sending a channel sounding signal SRS is also provided, which is located in a base station and includes:

A configuration module configured to send the transmission configuration information of the channel sounding signal SRS to the terminal. The transmission method of the SRS in the transmission configuration information includes one of the following:

The SRS is sent as a component signal of the discovery signal DRS;

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, or sequence number configuration, or transmission configuration.

Through the present invention, the terminal sends the channel sounding signal SRS to the base station, wherein the sending method of the SRS includes one of the following: the SRS is sent as a component signal of the discovery signal DRS; the SRS and the DRS are sent in the same subframe or adjacent subframes; The SRS and the downlink channel or signal are multiplexed and sent in the same subframe; the downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS; based on the restricted or modified SRS subframe configuration, or sequence number configuration, or transmission configuration Sending the SRS solves the problem of not being able to measure uplink and downlink channel condition information in a timely and effective manner, and improves the spectrum usage efficiency of unlicensed carriers.

Description of the drawings

The drawings described here are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached picture:

Figure 1 is a flow chart 1 of a method for transmitting a channel sounding signal SRS according to an embodiment of the present invention;

Figure 2 is a flow chart 2 of a method for transmitting a channel sounding signal SRS according to an embodiment of the present invention;

Figure 3 is a structural block diagram 1 of a device for sending a channel sounding signal SRS according to an embodiment of the present invention;

Figure 4 is a structural block diagram 2 of a device for transmitting a channel sounding signal SRS according to an embodiment of the present invention;

Figure 5 is a schematic diagram 1 of the positional relationship between SRS and DRS according to the preferred embodiment of the present invention;

Figure 6 is a schematic diagram 2 of the positional relationship between SRS and DRS according to the preferred embodiment of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other.

It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

This embodiment provides a method for sending a channel sounding signal SRS. Figure 1 is a flow chart 1 of a method for sending a channel sounding signal SRS according to an embodiment of the present invention. As shown in Figure 1, the process includes the following step:

Step S102: Configure the SRS sending method. The sending method includes one of the following:

The SRS is sent as a component signal of the discovery signal;

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, sequence number configuration, or transmission configuration.

Step S104: The terminal sends the channel sounding signal SRS to the base station according to the above sending method.

Through the above steps, the terminal sends a channel sounding signal SRS to the base station. The SRS is used for uplink and downlink channel measurement, which solves the problem of not being able to measure uplink and downlink channel status information in a timely and effective manner, and improves the spectrum usage efficiency of unlicensed carriers.

In the embodiment of the present invention, the SRS as a component signal of the discovery signal DRS includes:

The SRS is a necessary component signal of the DRS, or the SRS is a configurable signal in the DRS.

In the embodiment of the present invention, when the SRS is transmitted as a component signal of the DRS,

The SRS is located on the whitespace symbol of the DRS; and/or,

The duration of the DRS is set to 13 symbols in the transmission subframe where the DRS is located, and the SRS is located on the 13th symbol of the transmission subframe where the DRS is located; alternatively, the duration of the DRS is set to the 13th symbol of the transmission subframe where the DRS is located; The last symbol of the previous transmission subframe in the two adjacent transmission subframes and the 12 symbols of the latter transmission subframe in the two adjacent transmission subframes, and the SRS is located in the two adjacent transmission subframes. On the last symbol of the previous transmission subframe; and/or,

The duration of the DRS is set to 14 symbols in the transmission subframe where the DRS is located, and the SRS is located on the 14th symbol of the transmission subframe where the DRS is located; or, the duration of the DRS is set to the 14th symbol of the transmission subframe where the DRS is located. The last two symbols of the previous transmission subframe in the two adjacent transmission subframes and the 12 symbols of the latter transmission subframe in the two adjacent transmission subframes, the SRS is located in the two adjacent transmission subframes on the penultimate symbol of the previous transmission subframe.

In the embodiment of the present invention, when the SRS and the DRS are sent in the same subframe or adjacent subframes,

The SRS is sent on the blank symbols of the DRS; and/or,

The SRS is sent on the 13th symbol or the 14th symbol in the sending subframe where the DRS is located; and/or,

The SRS is sent in the subframe preceding the sending subframe in which the DRS is located.

In the embodiment of the present invention, when the SRS and the DRS are sent in the same subframe or adjacent subframes, LBT is executed once, and the SRS and the DRS are sent according to the execution result of the LBT.

In the embodiment of the present invention, when the SRS is sent as a component signal of the DRS, or when the SRS and the DRS are sent in the same subframe or adjacent subframes, the configuration parameters of the SRS are modified or restricted, so that the SRS The sending position is located in the DRS measurement timing configuration DMTC subframe or DRS subframe, where the configuration parameters include at least one of the following: subframe configuration, configuration sequence number, period, and offset.

In the embodiment of the present invention, when the SRS is sent as a component signal of the discovery signal DRS, the configuration parameters of the SRS are the same as the DRS or the measurement timing configuration (DRS measurement timing configuration, DMTC for short), wherein, the configuration Parameters include: period and/or offset.

In the embodiment of the present invention, when the SRS and the downlink channel or signal are sent in the same subframe, the terminal is a terminal scheduled by the downlink channel, or the terminal is not a terminal scheduled by the downlink channel.

In the embodiment of the present invention, when the SRS is sent in the same subframe as the downlink channel or signal, the last symbol or a specific symbol of the subframe multiplexed by the downlink channel is reserved or determined to be used for sending the SRS. , wherein the downlink channel or signal is not mapped to the last symbol or specific symbol of the subframe.

In the embodiment of the present invention, when the SRS is sent in the same subframe as the downlink channel or signal, the SRS is sent in the last symbol of the subframe multiplexed with the downlink channel, where the SRS is in the channel state information The measurement reference signal CSI-RS or the downlink user-specific reference signal UE-specific RS is not transmitted on the symbols or subframes occupied.

In the embodiment of the present invention, sending the SRS according to the restricted or modified SRS subframe configuration includes:

Configure each subframe in the radio frame as a sending subframe that allows the SRS to be sent; or

Each uplink subframe in the radio frame is configured as a transmission subframe that allows transmission of the SRS.

In the embodiment of the present invention, sending the SRS according to the restricted or modified sequence number configuration includes:

Limit or modify the transmission cycle and/or transmission offset used to transmit the SRS;

The SRS is sent using a restricted or modified sending period and/or sending offset.

In the embodiment of the present invention, sending the SRS according to the restricted or modified sending configuration includes:

In the case where the terminal receives an SRS transmission request in subframe n, the terminal starts transmitting the SRS on the first idle subframe that meets the following conditions:

The first idle subframe is the n+kth subframe, where k is greater than or equal to 4;

The first idle subframe is the first idle subframe for uplink transmission, or the first idle subframe is the first subframe in which the terminal is scheduled to send the uplink physical shared channel PUSCH, or the first The idle subframes are transmission subframes that meet the preset SRS subframe configuration requirements, where the preset SRS subframe configuration requirements include: configuring each subframe in the radio frame as a transmission subframe that allows transmission of the SRS; or Configure each uplink subframe in the radio frame as a transmission subframe that allows transmission of the SRS; or configure a transmission subframe for transmitting the SRS through a restricted or modified transmission period and/or transmission offset;

In the embodiment of the present invention, before the terminal sends the channel sounding signal SRS to the base station, it also includes:

The terminal receives downlink control signaling sent by the base station, wherein the downlink control signaling satisfies at least one of the following formats: DCI format 0, DCI format 4, DCI format 1A, DCI format 2B, DCI format 2C; the downlink control The signaling includes at least one of the following fields: SRS period, SRS offset, single transmission of SRS, multiple transmissions of SRS in a preset burst, periodic transmission of SRS based on opportunities after triggering, and continuation of SRS transmission. Duration, SRS sending delay.

In the embodiment of the present invention, before the terminal sends the channel sounding signal SRS to the base station, it also includes:

The terminal receives downlink control signaling sent by the base station, wherein the downlink control signaling satisfies at least one of the following formats: DCI format 1C, DCI format 3A, DCI format 3C; the downlink control signaling includes the following fields: At least one of: SRS subframe set, SRS transmission pattern, SRS cycle, SRS offset, and SRS transmission duration.

This embodiment also provides a method for sending a channel sounding signal SRS. Figure 2 is a flow chart 2 of a method for sending a channel sounding signal SRS according to an embodiment of the present invention. As shown in Figure 2, the process includes Follow these steps:

Step S202: The base station configures the SRS transmission method. The transmission method includes one of the following:

The SRS is sent as a component signal of the discovery signal DRS;

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, sequence number configuration, or transmission configuration.

Step S204: The base station sends the transmission configuration information of the channel sounding signal SRS to the terminal.

Through the above steps, the base station sends the transmission configuration information of the channel sounding signal SRS to the terminal, which solves the problem of not being able to measure uplink and downlink channel status information in a timely and effective manner, and improves the spectrum usage efficiency of unlicensed carriers.

In the embodiment of the present invention, before the base station sends the transmission configuration information of the channel sounding signal SRS to the terminal, the method further includes:

Downlink control signaling sent by the base station to the terminal, wherein the downlink control signaling satisfies at least one of the following formats: DCI format 0, DCI format 4, DCI format 1A, DCI format 2B, DCI format 2C; the downlink control signaling The control signaling includes at least one of the following fields: SRS period, SRS offset, SRS single transmission, SRS multiple transmissions in the preset burst, SRS periodic transmission according to opportunities after triggering, SRS transmission Duration, SRS sending delay, and indication information indicating whether SRS is sent.

Figure 3 is a structural block diagram 1 of a device for transmitting a channel sounding signal SRS according to an embodiment of the present invention. As shown in Figure 3, the device is located in a terminal and includes:

The first configuration module 32 is used to configure the SRS transmission method. The transmission method includes one of the following:

The SRS is sent as a component signal of the discovery signal DRS;

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, sequence number configuration, or transmission configuration.

The first sending module 34 is connected to the first configuration module 32 and is used to send the channel sounding signal SRS to the base station according to the above sending method.

Figure 4 is a structural block diagram 2 of a device for transmitting a channel sounding signal SRS according to an embodiment of the present invention. As shown in Figure 4, the device is located in a base station and includes:

The second configuration module 42 is used to configure the SRS transmission method. The transmission method includes one of the following:

The SRS is sent as a component signal of the discovery signal DRS;

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, sequence number configuration, or transmission configuration.

The second sending module 44 is configured to connect to the second configuration module 42 and send information configuring the SRS sending mode to the terminal.

The present invention will be described in detail below with reference to preferred embodiments and implementation modes.

SRS can be sent alone or together with other uplink channels. SRS has two modes: periodic transmission and aperiodic transmission (ie trigger type 0 and trigger type 1). SRS is sent in the last symbol of the subframe (for TDD uplink pilot (UpPTS) it occupies 2 Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbols, both of which can be used transmitted in SRS). The period of SRS is between 2ms and 320ms (trigger type 0/1 and FDD/TDD are different).

Example 1:

Regarding the transmission relationship between uplink SRS and downlink discovery signal DRS, the following design is available:

In Rel-13, DRS has a higher LBT priority. It only needs to listen for a time interval not less than X us (such as 25us), and the base station can send DRS. In the Rel-12/13 version, the DMTC period is 40/80/160ms and the duration is 6ms. Therefore, DRS with a longer transmission cycle uses a higher priority LBT method and has little impact on data transmission. The SRS may be transmitted as a component signal of the DRS or in a manner accompanied by the DRS.

Method 1: SRS is sent as a component signal of DRS.

Redesign DRS for unlicensed carriers. The new DRS includes not only downlink CRS, PSS/SSS, configurable CSI-RS, but also uplink SRS. The uplink SRS can be a necessary component signal of DRS or a configurable signal in DRS, which can be used for uplink and downlink channel measurements.

DRS can still be the 12 OFDM symbol structure of Rel-13 DRS (symbol 0 to symbol 11, of which unknown signals or occupied signals can be sent on symbols 1/2/3/8. The standard is not defined and these can be regarded as blanks. symbol). SRS is sent on blank symbols in Rel-13 DRS, such as symbol 1 (the second symbol of the subframe, the same below), or symbol 2, or symbol 3, or symbol 8. SRS is sent on the blank symbols in the existing DRS. On the one hand, it does not change the length of the DRS. On the other hand, it also plays the role of occupying the channel;

DRS can also be a 13 symbol structure. The SRS is transmitted on symbol 12 (the 13th symbol of the subframe) of the same subframe, or the SRS is transmitted on the last symbol of the subframe before the existing DRS transmission subframe. That is, the last symbol of the previous subframe sends the SRS, and the first 12 symbols of the next subframe send the existing DRS. These 13 symbols constitute the new DRS. This method is a switch from uplink to downlink, and there is basically no need to consider the uplink and downlink switch delay.

New DRS including SRS and existing DRS only need to perform LBT once to send SRS and existing SRS. For example, for the former method, SRS can directly use the LBT result of DRS. After the existing DRS component signals are sent, SRS can be sent directly without the need to perform LBT or fill in occupancy signals or occupancy information. Figure 5 is a schematic diagram 1 of the positional relationship between SRS and DRS according to a preferred embodiment of the present invention. As shown in Figure 5, the new DRS includes symbol 13 on subframe n and symbols 0 to 11 on subframe n+1. A total of 13 symbols. In method one, the SRS in Figure 5 is the component signal of DRS. It should be noted that the duration of CCA is not necessarily a symbol in Figure 5. For example, it can be only tens of us. Figure 5 only gives an example of the location of CCA and does not limit the duration and method of CCA.

DRS can also be a 14 symbol structure. The SRS is sent on symbol 13 of the same subframe (the 14th symbol of the subframe), and symbol 12 can send CRS or some other signals or information. The advantage of this choice is that there is no need to change the time domain position of the existing SRS transmission. Furthermore, since Rel-13 limits the effective transmission duration of DRS LBT to be less than 1ms, this restriction can be modified, that is, the effective transmission duration of DRS LBT can be equal to or greater than 1ms, and at least DRS including 14 symbols can be transmitted. DRS adopts a 14-symbol structure, which also helps the UE handle the uplink and downlink transmission switching delay. Figure 6 is a second schematic diagram of the positional relationship between SRS and DRS according to a preferred embodiment of the present invention. As shown in Figure 6, in method one, the SRS in Figure 6 is a component signal of the DRS. The new DRS includes symbols 0 to 13 on subframe n+1, a total of 14 symbols. It should be noted that the duration of CCA is not necessarily a symbol in Figure 6. For example, it can be only tens of us. Figure 6 only gives an example of the location of CCA and does not limit the duration and method of CCA.

Alternatively, the SRS is transmitted in the penultimate symbol of the subframe preceding the existing DRS transmission subframe. That is, the penultimate symbol of the previous subframe sends SRS, and the first 12 symbols of the next subframe send the existing DRS. These 14 symbols form a new DRS (including the SRS and the existing DRS component signals). A blank symbol that can send an occupied signal or an undefined signal).

Preferably, the DRS including SRS adopts a 13 or 14 symbol structure.

The SRS subframe configuration (srs-SubframeConfig) and/or sequence number configuration (SRS ConfigurationIndex Isrs, which determines the SRS period and offset) may cause the SRS transmission position to not fall in the DMTC. For example, Isrs=37, the corresponding SRS period is 40ms and the offset is 0. If the period of DMTC is also 40ms, but the offset is 1ms, then according to the above configuration, SRS will not be sent in DMTC.

Therefore, one or more parameters such as the subframe configuration, configuration sequence number, period, and offset of the SRS can be modified and restricted to adapt to sending the SRS on the DMTC subframe or the DRS subframe. The configuration of srs-SubframeConfig in Table 5.5.3.3-1 and/or Table 5.5.3.3-2 in 3GPP 36.211Rel-10~13 can be restricted or modified. And/or, restrict the SRS Configuration Index Isrs configuration in Table 8.2-1, and/or Table 8.2-2, and/or Table 8.2-4, and/or Table 8.2-4 in 3GPP 36.213Rel-10~13 or modification. For example, determine the SRS period in DRS to 40, 80, or 160ms, for example, limit the SRS Configuration Index Isrs configuration range in DRS to 37-316.

Alternatively, the SRS configuration in DRS can be loosened from the traditional SRS configuration, that is, the SRS in DRS adopts the same configuration as DRS or DMTC, including the same period or offset. SRS can be a necessary component signal of DRS or a configurable signal in DRS. SRS is a configurable signal in DRS, which means that it can be configured to send SRS in DMTC or DRS subframe, or it can be configured not to send SRS.

The above design of DRS and the design of the SRS transmission method in DRS do not limit traditional SRS configuration transmission. That is, the SRS in DRS can be sent using the above method, and the traditional SRS can still be sent according to the traditional configuration or sending method.

Method 2: SRS can be multiplexed with DRS in the same subframe or sent in adjacent subframes

DL DRS and UL SRS can be sent in the same subframe. DRS can still adopt the Rel-13 structure, that is, the 12-symbol structure. SRS is not a component signal of DRS. Since DRS has a higher LBT priority, the base station only needs to listen for a time interval not less than X us (such as 25us) before the base station can send DRS. Therefore, SRS can use the LBT result of DRS to send. SRS can be sent on the DRS subframe, and no channel sensing is required.

Further, the SRS may be sent on DRS subframe symbol 12 (the 13th OFDM symbol in the subframe). SRS sends LBT results that can directly utilize DRS. After the DRS is sent, the SRS can be sent directly without performing LBT or filling in occupancy signals or occupancy information.

Alternatively, SRS is sent on DRS subframe symbol 13, and channel sensing is no longer required. As shown in Figure 6 (note that SRS is not a component signal of DRS in this method). Symbol 12 can send some other occupancy signals or information, which is not limited by the present invention. The advantage of this method is that it does not need to change the time domain position of the existing SRS transmission, and can ensure the uplink and downlink transmission switching delay of the UE. Since Rel-13 limits the effective sending time of DRS LBT to less than 1ms, this restriction can be modified, that is, the effective sending time of DRS LBT can be equal to or greater than 1ms to ensure that SRS can utilize the listening results of DRS LBT.

Alternatively, the SRS is sent on a blank symbol in the middle of the DRS, such as symbol 1, or symbol 2, or symbol 3, or symbol 8. The advantage is that there is no need to change the validity period of the existing DRS LBT listening results.

Alternatively, the SRS is sent on the subframe preceding the DRS subframe, preferably on the penultimate or penultimate symbol of the subframe preceding the DRS subframe. SRS and DRS can perform LBT once, and if successful, send SRS and DRS. The advantage of this method is that SRS is sent before DRS, there is no need to consider uplink and downlink switching delays, and the two can share the same LBT result. As shown in Figure 5 (note that SRS is not a component signal of DRS in this method).

In summary, SRS and DRS can be sent in the same subframe or adjacent subframes, and both share the result of one LBT listening. Whether SRS is sent before DRS, or DRS is sent before SRS, or both are sent in multiplexing, LBT or CCA only needs to be performed once.

Further, one or more parameters such as subframe configuration, period, and offset of the SRS may be restricted or modified to adapt to sending the SRS on the DMTC subframe or the DRS subframe. The configuration of srs-SubframeConfig in Table 5.5.3.3-1 and/or Table 5.5.3.3-2 in 3GPP 36.211Rel-10~13 can be restricted or modified. And/or, restrict the SRS Configuration Index Isrs configuration in Table 8.2-1, and/or Table 8.2-2, and/or Table 8.2-4, and/or Table 8.2-4 in 3GPP 36.213Rel-10~13 or modification. For example, the SRS period is 40, 80, or 160ms, and the SRS Configuration Index Isrs configuration range is limited to 37-316.

SRS can be configured to be sent in every DRS subframe or in DMTC, or it can be configured flexibly, that is, SRS is sent in some DRS subframes and SRS is not sent in some DRS subframes.

Example 2:

Regarding the transmission relationship between uplink SRS and downlink channels or signals, the following design is available:

The base station configures the UE to send SRS. Assuming that the channel is idle, the UE sends SRS according to the configured srs-SubframeConfig (determines the subframe in which SRS can be sent), SRS Configuration Index (determines the period and offset of SRS transmission), and/or other parameters. SRS can be sent together with other uplink channels or alone. When the SRS is transmitted alone, it only occupies the last symbol of the subframe. Therefore, from the perspective of resource saving and spectrum efficiency, the subframe can also be used for downlink scheduling or transmission. In the unlicensed carrier scenario, whether the SRS subframe can still be used for downlink scheduling or transmission is as follows:.

Method 1: The downlink channel or signal and the uplink SRS can be multiplexed and sent in the same subframe, and are not limited to the special subframes of Rel-10. The UE that receives the downlink channel and sends the uplink SRS may or may not be the same UE. For example, the UE that receives the downlink channel is the scheduled UE, and the UE that sends the uplink SRS is another UE. When the UE is configured to send SRS in a certain subframe, the downlink channel will not be mapped to the last symbol or specific symbol of the subframe. The downlink channel may be PDSCH or (E)PDCCH, etc.

Because SRS subframe configuration is a cell-level behavior, all UEs in the cell should know on which subframe sets UEs may send SRS. Therefore, the base station or the scheduled UE will make an assumption, that is, assuming that the PDSCH and/or other downlink channels or signals will not be mapped to the last symbol of the subframe, or specific symbols (such as the last two symbols), if the The subframe is or may be used to send SRS.

In other words, when the resource block, or resource element, or subframe, or symbol is not used for SRS transmission (plus some existing restrictions, such as not being used for PBCH, synchronization signals, CRS signals, etc.), PDSCH, and /Or other downlink channels or signals can be mapped to corresponding resources.

If the downlink channel such as PDSCH or (E)PDCCH is sent on the same symbol as the SRS, the SRS is not sent.

If the SRS occupies the last symbol, it will face collision problems with CSI-RS and downlink UE-specific RS. Another solution is that in order to maintain the channel measurement, demodulation and other functions of CSI-RS or downlink UE-specific RS, SRS is not transmitted on the symbols or subframes occupied by CSI-RS or downlink UE-specific RS.

Method 2: The downlink channel or signal will not be mapped to the subframe configured by SRS. For unlicensed carriers, in order to avoid the impact on periodic or aperiodic SRS transmission, the downlink channel/signal will not be mapped to the SRS configured subframe. The downlink channel/signal may include a discovery signal, or the downlink channel/signal may not include a discovery signal, and the discovery signal has a higher priority. If the discovery signal subframe encounters an SRS subframe, the discovery signal is sent first. Parameters such as SRS subframe configuration, SRS ConfigurationIndex (which determines the period and offset of SRS transmission), and SRS bandwidth are configured by high-level signaling. The base station can predict which subframes the UE served by the cell may transmit on. In order to avoid collision and interference between downlink channels or signals and SRS transmission, the base station does not send downlink channels or downlink signals in the SRS subframe.

Embodiment 3

Regarding the transmission relationship between the uplink SRS and the uplink channel or signal, the following design is available:

For SRS transmission of trigger type 1, there are currently the following restrictions:

(1) The set of subframe numbers that can be used to send SRS in a cell is configured through the srs-SubframeConfig field of IE (see 3GPP 36.331 protocol for details): SoundingRS-UL-ConfigCommon. This is a cell-level configuration (through SIB2 Issued).

Specifically how to configure the SRS transmission set through srs-SubframeConfig is given in Table 5.5.3.3-1 (for FDD) and Table 5.5.3.3-2 (for TDD) of 3GPP 36.211. These two tables give the set of subframes that can be used to send SRS within each system frame under each configuration. And the following conditions need to be met,

(2) If the UE configures aperiodic SRS on serving cell c and detects an SRS request on subframe n of serving cell c, the UE will send aperiodic SRS on the first subframe that meets the following conditions SRS:

a. This subframe satisfies, and n+k,k≥4, and

b. For "TDD cells with T _SRS,1 >2" and "FDD cells", the subframe used to send aperiodic SRS must satisfy (10·n _f +k _SRS -T _offset,1 )mod T _SRS,1 =0;

c. For "SRS transmission with TDD and T _SRS,1 =2", the subframes sent must satisfy (k _SRS -T _offset,1 ) mod 5=0.

Among them, for FDD, k _SRS = {0,1,...,9} is the subframe number within each system frame n _f . For TDD, k _SRS is defined in Table 8.2-3 of 3GPP 36.213 . The SRS period T _SRS,1 , and the SRS subframe offset, T _offset,1 , are determined by the SRS configuration sequence number I _SRS in 3GPP 36.213 Table 8.2-4 and Table 8.2-5. For FDD and TDD situations respectively.

For unlicensed carrier scenarios, it is necessary to listen to whether the channel is idle before sending SRS. Even if the channel is idle, it will be limited by the maximum sending duration Tmcot and/or regional rules. Coupled with the above-mentioned SRS subframe set restrictions and SRS transmission cycle/offset restrictions, the SRS transmission probability will be greatly reduced, thus affecting data scheduling. Therefore, it is necessary to design a new SRS transmission method to improve the success probability of SRS transmission.

Unlicensed carriers do not need to set SRS subframe configuration. That is, the srs-SubframeConfig field is not needed to configure the subframe set for sending SRS; or, the SRS subframe configuration in the unlicensed carrier is restricted or modified. For example, each subframe in the radio frame is restricted to be a possible transmission subframe of SRS, or each uplink subframe and/or part of the subframes in the radio frame is restricted to be a possible transmission subframe of SRS. For example, limit srs-SubframeConfig in Table 5.5.3.3-1 to 0, or limit srs-SubframeConfig in Table 5.5.3.3-2 to 7.

And/or, the unlicensed carrier does not need to set the SRS configuration sequence number. That is, there is no need to configure _ISRS , the corresponding period T _SRS and the offset T _offset for the UE through srs-ConfigIndexAp-r10. Or, limit or modify the SRS configuration sequence number in the unlicensed carrier. For example, limit the SRS configuration sequence number I _SRS to 0 or 1. That is, the SRS transmission period in unlicensed carriers is limited to 2ms. Or, limit or modify the SRS transmission cycle. For example, 2ms or 1ms.

And/or, if the UE receives an SRS transmission request in subframe n, the UE will start sending aperiodic SRS on the first idle subframe that meets the following conditions:

a.The subframe>=n+4, and

b. The first available subframe that can be used for uplink transmission; or the first subframe in which the UE is scheduled to send PUSCH; or the subframe that meets the SRS subframe configuration requirements (this one is the same as the existing technology, but the SRS The subframe configuration has been modified as above).

If the SRS subframe configuration is not retained or the SRS subframe configuration is restricted or modified, the UE needs to perform corresponding rate matching behavior based on the above modifications. For example, the UE will assume that the last symbol or specific symbol on each subframe or uplink subframe or part of the subframe available for uplink transmission may be used for SRS transmission. Therefore, the UE will not use the last symbol of the subframe. Or map PUSCH on a specific symbol. The specific symbol may be the first symbol of the subframe, or the penultimate symbol, or other symbols designated to transmit SRS.

In the existing technology, for trigger type 1 SRS (corresponding to aperiodic SRS), for FDD, the eNodeB can trigger the UE to send aperiodic SRS through DCI format 0/4/1A. For TDD, the eNodeB can trigger the UE to send aperiodic SRS through DCI format0/4/1A/2B/2C. (Use the SRS request field in the corresponding DCI)

The SRS triggering method in unlicensed carriers can be enhanced to improve SRS transmission probability and configuration flexibility.

In DCI format 0/4/1A/2B/2C (the "/" here is the "and/or" relationship). Add one or more of the following SRS transmission configuration fields: SRS cycle, SRS offset, SRS single transmission, SRS multiple transmissions in a burst (for example, multiple transmissions in a burst according to the configured cycle/offset, or (sent in every subframe in burst), SRS is sent periodically according to opportunities after triggering, duration of SRS sending, SRS sending delay, etc.

Alternatively, the base station sends public downlink signaling to the UE to notify the SRS transmission status. For example: the terminal receives downlink control signaling sent by the base station, wherein the downlink control signaling satisfies at least one of the following formats: DCI format 1C, DCI format 3A, DCI format 3C; in the downlink control signaling It includes at least one of the following fields: SRS transmission subframe set, SRS transmission pattern, SRS cycle, SRS offset, SRS transmission duration, and indication information used to indicate whether SRS is transmitted.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is Better implementation. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence or the part that contributes to the existing technology. The computer software product is stored in a storage medium (such as ROM/RAM, disk, CD), including several instructions to cause a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

It should be noted that each of the above modules can be implemented through software or hardware. For the latter, it can be implemented in the following ways, but is not limited to this: the above modules are all located in the same processor; or the above modules are located on multiple processors. in the processor.

An embodiment of the present invention also provides a storage medium. Optionally, in this embodiment, the above-mentioned storage medium may be configured to store program codes for performing the following steps:

S1, configure the SRS sending method. The sending method includes one of the following:

The SRS is sent as a component signal of the discovery signal;

The SRS and DRS are sent in the same subframe or adjacent subframes;

The SRS and the downlink channel or signal are multiplexed and sent in the same subframe;

The downlink channel or signal is mapped to a subframe other than the configured subframe of the SRS;

The SRS is sent according to the restricted or modified SRS subframe configuration, or sequence number configuration, or transmission configuration.

S2: The terminal sends the channel sounding signal SRS to the base station according to the above sending method.

Optionally, the storage medium is further configured to store program code for executing the method steps of the above embodiments:.

Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic Various media that can store program code, such as discs or optical disks.

Optionally, in this embodiment, the processor executes the method steps of the above embodiment according to the program code stored in the storage medium.

Optionally, for specific examples in this embodiment, reference can be made to the examples described in the above-mentioned embodiments and optional implementations, and details will not be described again in this embodiment.

Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented using general-purpose computing devices. They can be concentrated on a single computing device, or distributed across a network composed of multiple computing devices. , optionally, they may be implemented in program code executable by a computing device, such that they may be stored in a storage device for execution by the computing device, and in some cases, may be in a sequence different from that herein. The steps shown or described are performed either individually as individual integrated circuit modules, or as multiple modules or steps among them as a single integrated circuit module. As such, the invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (16)

1. A method for transmitting a channel sounding signal SRS, comprising:

The terminal transmits a channel sounding signal SRS to the base station, wherein the SRS transmission mode comprises one of the following steps:

the SRS is transmitted as a component signal of a discovery signal DRS, and is positioned on a blank symbol of the DRS when the SRS is transmitted as the component signal of the discovery signal DRS; and/or, the duration of the DRS is set to 13 symbols in a transmission subframe where the DRS is located, and the SRS is located on the 13 th symbol of the transmission subframe where the DRS is located; or the duration of the DRS is set to be the last symbol of the previous transmission subframe in two adjacent transmission subframes where the DRS is located and 12 symbols of the next transmission subframe in the two adjacent transmission subframes, and the SRS is located on the last symbol of the previous transmission subframe in the two adjacent transmission subframes; and/or, the duration of the DRS is set to be 14 symbols in a transmission subframe where the DRS is located, and the SRS is located on the 14 th symbol of the transmission subframe where the DRS is located; or the duration of the DRS is set to be the last two symbols of the previous transmission subframe in the two adjacent transmission subframes where the DRS is located and 12 symbols of the next transmission subframe in the two adjacent transmission subframes, and the SRS is located on the last two symbols of the previous transmission subframe in the two adjacent transmission subframes;

The SRS and the DRS are transmitted in the same subframe or adjacent subframes, wherein LBT is executed once under the condition that the SRS and the DRS are transmitted in the same subframe or adjacent subframes, and the SRS and the DRS are transmitted according to the execution result of the LBT;

the SRS is sent in a multiplexing manner with a downlink channel or a signal co-subframe, wherein when the SRS is sent in a multiplexing manner with the downlink channel or the signal co-subframe, the SRS is sent in the last symbol of the subframe multiplexed with the downlink channel, and the SRS is not sent in a symbol or subframe occupied by a channel state information measurement reference signal (CSI-RS) or a downlink user specific reference signal (UE-specific RS);

the downlink channel or signal is mapped to a subframe outside the configuration subframe of the SRS;

and transmitting the SRS according to the limited or modified SRS subframe configuration, or sequence number configuration or transmission configuration.

2. The method of claim 1, wherein the SRS as a constituent signal of a discovery signal DRS comprises:

the SRS is a necessary constituent signal of the DRS, or the SRS is a configurable signal in the DRS.

3. The method of claim 1, wherein, in the case where the SRS is transmitted with a DRS in a same subframe or in a neighboring subframe,

The SRS is sent on blank symbols of the DRS; and/or the number of the groups of groups,

the SRS is sent on the 13 th symbol or the 14 th symbol in the sending subframe where the DRS is located; and/or the number of the groups of groups,

the SRS is sent on a previous subframe of the sending subframe where the DRS is located.

4. The method of claim 1, wherein in the case where the SRS is transmitted as a constituent signal of a discovery signal DRS, or the SRS is transmitted with a DRS co-subframe or an adjacent subframe, a configuration parameter of the SRS is modified or limited such that a transmission position of the SRS is located in a DRS measurement timing configuration DMTC subframe or a DRS subframe, wherein the configuration parameter includes at least one of: subframe configuration, configuration sequence number, period and offset.

5. The method of claim 1, wherein configuration parameters of the SRS are the same as the DRS or DMTC in the case where the SRS is transmitted as a constituent signal of a discovery signal DRS, wherein the configuration parameters include: period and/or offset.

6. The method of claim 1, wherein the terminal is a terminal scheduled by the downlink channel or is not a terminal scheduled by the downlink channel in case the SRS is transmitted multiplexed with a downlink channel or a signal with a subframe.

7. The method of claim 1, wherein a last symbol or a particular symbol of a subframe in which the downlink channel is multiplexed is reserved or determined for transmitting the SRS in the case where the SRS is multiplexed with the downlink channel or signal, wherein the downlink channel or signal is not mapped to the last symbol or the particular symbol of the subframe.

8. The method of claim 1, wherein transmitting the SRS in accordance with a restricted or modified SRS subframe configuration comprises:

configuring each subframe in a radio frame as a transmission subframe allowing transmission of the SRS; or alternatively

Each uplink subframe in the radio frame is configured as a transmission subframe in which transmission of the SRS is allowed.

9. The method of claim 1, wherein transmitting the SRS in accordance with a restricted or modified sequence number configuration comprises:

limiting or modifying a transmission period and/or a transmission offset for transmitting the SRS;

the SRS is transmitted using the limited or modified transmission period and/or transmission offset.

10. The method of claim 1, wherein transmitting the SRS in accordance with a restricted or modified transmission configuration comprises:

In the case that the terminal receives an SRS transmission request in a subframe n, the terminal starts to transmit the SRS on a first idle subframe satisfying the following conditions, where n is any natural number from 0 to 9:

the first idle subframe is an n+k subframe, wherein k is greater than or equal to 4;

the first idle subframe is a first idle subframe for uplink transmission, or the first idle subframe is a subframe for the terminal to transmit an uplink physical shared channel PUSCH in a first scheduled manner, or the first idle subframe is a transmission subframe meeting a preset SRS subframe configuration requirement, where the preset SRS subframe configuration requirement includes: configuring each subframe in a radio frame as a transmission subframe allowing transmission of the SRS; or configuring each uplink subframe in the radio frame as a transmission subframe allowing transmission of the SRS; or a transmission subframe configured by limiting or modifying a transmission period and/or a transmission offset for transmitting the SRS.

11. The method of claim 1, further comprising, prior to the terminal transmitting the channel sounding signal SRS to the base station:

the terminal receives a downlink control signaling sent by a base station, wherein the downlink control signaling meets at least one of the following formats: DCI format 0, DCI format 4, DCI format 1a, DCI format 2b, DCI format 2C; the downlink control signaling comprises at least one of the following fields: the method comprises the steps of SRS period, SRS offset, single SRS transmission, multiple SRS transmission in a preset burst, SRS periodic transmission according to opportunities after triggering, duration of SRS transmission and SRS transmission time delay.

12. The method of claim 1, further comprising, prior to the terminal transmitting the channel sounding signal SRS to the base station:

the terminal receives a downlink control signaling sent by a base station, wherein the downlink control signaling meets at least one of the following formats: DCI format 1C, DCI format 3a, DCI format 3C; the downlink control signaling comprises at least one of the following fields: the method comprises the steps of subframe set of SRS, SRS transmission pattern, SRS period, SRS offset, SRS transmission duration and indication information for indicating whether the SRS is transmitted or not.

13. A method for transmitting a channel sounding signal SRS, comprising:

the base station transmits transmission configuration information of a channel sounding signal SRS to the terminal, wherein the transmission mode of the SRS in the transmission configuration information comprises one of the following steps:

the SRS is transmitted as a component signal of a discovery signal DRS, and is positioned on a blank symbol of the DRS when the SRS is transmitted as the component signal of the discovery signal DRS; and/or, the duration of the DRS is set to 13 symbols in a transmission subframe where the DRS is located, and the SRS is located on the 13 th symbol of the transmission subframe where the DRS is located; or the duration of the DRS is set to be the last symbol of the previous transmission subframe in two adjacent transmission subframes where the DRS is located and 12 symbols of the next transmission subframe in the two adjacent transmission subframes, and the SRS is located on the last symbol of the previous transmission subframe in the two adjacent transmission subframes; and/or, the duration of the DRS is set to be 14 symbols in a transmission subframe where the DRS is located, and the SRS is located on the 14 th symbol of the transmission subframe where the DRS is located; or the duration of the DRS is set to be the last two symbols of the previous transmission subframe in the two adjacent transmission subframes where the DRS is located and 12 symbols of the next transmission subframe in the two adjacent transmission subframes, and the SRS is located on the last two symbols of the previous transmission subframe in the two adjacent transmission subframes;

The SRS and the DRS are transmitted in the same subframe or adjacent subframes, wherein LBT is executed once under the condition that the SRS and the DRS are transmitted in the same subframe or adjacent subframes, and the SRS and the DRS are transmitted according to the execution result of the LBT;

the SRS is sent in a multiplexing manner with a downlink channel or a signal co-subframe, wherein when the SRS is sent in a multiplexing manner with the downlink channel or the signal co-subframe, the SRS is sent in the last symbol of the subframe multiplexed with the downlink channel, and the SRS is not sent in a symbol or subframe occupied by a channel state information measurement reference signal (CSI-RS) or a downlink user specific reference signal (UE-specific RS);

the downlink channel or signal is mapped to a subframe outside the configuration subframe of the SRS;

and transmitting the SRS according to the limited or modified SRS subframe configuration, or sequence number configuration or transmission configuration.

14. The method of claim 13, wherein before the base station transmits the transmission configuration information of the channel sounding signal SRS to the terminal, the method further comprises:

and the base station transmits downlink control signaling to the terminal, wherein the downlink control signaling meets at least one of the following formats: DCI format 0, DCI format 4, DCI format 1a, DCI format 2b, DCI format 2C; the downlink control signaling comprises at least one of the following fields: the method comprises the steps of SRS period, SRS offset, single SRS transmission, multiple SRS transmission in a preset burst, SRS periodic transmission according to opportunities after triggering, duration of SRS transmission and SRS transmission time delay.

15. A transmission apparatus for a channel sounding signal SRS, located in a terminal, comprising:

a transmitting module, configured to transmit a channel sounding signal SRS to a base station, where a transmission manner of the SRS includes one of:

the SRS is transmitted as a component signal of a discovery signal DRS, and is positioned on a blank symbol of the DRS when the SRS is transmitted as the component signal of the discovery signal DRS; and/or, the duration of the DRS is set to 13 symbols in a transmission subframe where the DRS is located, and the SRS is located on the 13 th symbol of the transmission subframe where the DRS is located; or the duration of the DRS is set to be the last symbol of the previous transmission subframe in two adjacent transmission subframes where the DRS is located and 12 symbols of the next transmission subframe in the two adjacent transmission subframes, and the SRS is located on the last symbol of the previous transmission subframe in the two adjacent transmission subframes; and/or, the duration of the DRS is set to be 14 symbols in a transmission subframe where the DRS is located, and the SRS is located on the 14 th symbol of the transmission subframe where the DRS is located; or the duration of the DRS is set to be the last two symbols of the previous transmission subframe in the two adjacent transmission subframes where the DRS is located and 12 symbols of the next transmission subframe in the two adjacent transmission subframes, and the SRS is located on the last two symbols of the previous transmission subframe in the two adjacent transmission subframes;

The SRS and the DRS are transmitted in the same subframe or adjacent subframes, wherein LBT is executed once under the condition that the SRS and the DRS are transmitted in the same subframe or adjacent subframes, and the SRS and the DRS are transmitted according to the execution result of the LBT;

the SRS is sent in a multiplexing manner with a downlink channel or a signal co-subframe, wherein when the SRS is sent in a multiplexing manner with the downlink channel or the signal co-subframe, the SRS is sent in the last symbol of the subframe multiplexed with the downlink channel, and the SRS is not sent in a symbol or subframe occupied by a channel state information measurement reference signal (CSI-RS) or a downlink user specific reference signal (UE-specific RS);

the downlink channel or signal is mapped to a subframe outside the configuration subframe of the SRS;

and transmitting the SRS according to the limited or modified SRS subframe configuration, or sequence number configuration or transmission configuration.

16. A transmission apparatus for a channel sounding signal SRS, located in a base station, comprising:

a configuration module, configured to send configuration information of a channel sounding signal SRS to a terminal, where a sending manner of the SRS in the configuration information includes one of the following:

the SRS is transmitted as a component signal of a discovery signal DRS, and is positioned on a blank symbol of the DRS when the SRS is transmitted as the component signal of the discovery signal DRS; and/or, the duration of the DRS is set to 13 symbols in a transmission subframe where the DRS is located, and the SRS is located on the 13 th symbol of the transmission subframe where the DRS is located; or the duration of the DRS is set to be the last symbol of the previous transmission subframe in two adjacent transmission subframes where the DRS is located and 12 symbols of the next transmission subframe in the two adjacent transmission subframes, and the SRS is located on the last symbol of the previous transmission subframe in the two adjacent transmission subframes; and/or, the duration of the DRS is set to be 14 symbols in a transmission subframe where the DRS is located, and the SRS is located on the 14 th symbol of the transmission subframe where the DRS is located; or the duration of the DRS is set to be the last two symbols of the previous transmission subframe in the two adjacent transmission subframes where the DRS is located and 12 symbols of the next transmission subframe in the two adjacent transmission subframes, and the SRS is located on the last two symbols of the previous transmission subframe in the two adjacent transmission subframes;

The SRS and the DRS are transmitted in the same subframe or adjacent subframes, wherein LBT is executed once under the condition that the SRS and the DRS are transmitted in the same subframe or adjacent subframes, and the SRS and the DRS are transmitted according to the execution result of the LBT;

the SRS is sent in a multiplexing manner with a downlink channel or a signal co-subframe, wherein when the SRS is sent in a multiplexing manner with the downlink channel or the signal co-subframe, the SRS is sent in the last symbol of the subframe multiplexed with the downlink channel, and the SRS is not sent in a symbol or subframe occupied by a channel state information measurement reference signal (CSI-RS) or a downlink user specific reference signal (UE-specific RS);

the downlink channel or signal is mapped to a subframe outside the configuration subframe of the SRS;

and transmitting the SRS according to the limited or modified SRS subframe configuration, or sequence number configuration or transmission configuration.