WO2022151391A1

WO2022151391A1 - Sending frequency adjustment method and apparatus

Info

Publication number: WO2022151391A1
Application number: PCT/CN2021/072261
Authority: WO
Inventors: 李可; 李翔; 赵泽涵; 戴喜增
Original assignee: 华为技术有限公司
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2022-07-21
Also published as: CN116210172A

Abstract

Embodiments of the present application provide a sending frequency adjustment (FA) method and apparatus, for use in mitigating the technical problems in existing multi-TRP communication scenarios that a terminal device cannot determine an uplink sending frequency according to received multiple TRSs, and consequently, the terminal device cannot adjust the uplink sending frequency, and a wireless access network device cannot correctly track the center frequency of an uplink signal received by the TRPs, such that the demodulation performance of the wireless access network device is lowered. The method comprises: a terminal device measuring TRSs respectively sent by multiple TRPs, different TRPs corresponding to different TRSs; the terminal device determining an uplink sending frequency according to a reference TRP, the reference TRP being one of the multiple TRPs; the terminal device sending an uplink signal on the uplink sending frequency; receiving an FA command from the reference TRP; and adjusting the uplink sending frequency according to the FA command, the FA command being used for indicating an FA parameter, and the FA parameter being determined according to the uplink signal.

Description

Method and device for adjusting transmission frequency

technical field

The embodiments of the present application relate to the field of communications technologies, and in particular, to a method and apparatus for adjusting a transmission frequency.

Background technique

In the existing communication system, when the terminal device moves, there is a relative movement speed between the terminal device and the transmission reception point (TRP) of the wireless access network device. When the wireless access network device communicates with the terminal device through the TRP, The center frequency of the received signal may have an offset relative to the center frequency of the transmitted signal, and the offset value of the center frequency may be referred to as the Doppler shift.

The wireless access network equipment can send a tracking reference signal (TRS) to the terminal equipment through TRP, and the terminal equipment can estimate the downlink Doppler frequency shift according to the received TRS, and according to the estimated downlink Doppler frequency The frequency shift determines the uplink transmission frequency, and the uplink transmission frequency is used to send a demodulation reference signal (DMRS) to the TRP. The wireless access network equipment can estimate the uplink Doppler frequency shift according to the DMRS received by the TRP, and quantify the uplink Doppler frequency shift according to a certain ratio to obtain a frequency adjustment (frequency adjustment, FA) value, and the FA is determined by the TRP. The value is sent to the terminal device, so that the terminal device can adjust the uplink transmission frequency according to the FA value, so as to reduce the Doppler frequency shift of the uplink signal received by the TRP.

However, when the radio access network device includes multiple TRPs and uses multiple TRPs to communicate with the terminal device, the radio access network device sends multiple TRSs to the terminal device through the multiple TRPs. The relative movement speed may be different, so that the terminal device cannot determine the uplink transmission frequency according to the received multiple TRS, so the wireless access network device cannot estimate the uplink Doppler frequency shift, and thus cannot determine the FA value, so that the terminal device cannot determine the FA value according to the FA value. Adjusting the uplink transmission frequency cannot reduce the Doppler frequency shift of the uplink signals received by multiple TRPs at the same time. When the Doppler frequency shift of the uplink signals received by the TRP is large, it may exceed the wireless access network equipment. The capability of estimating the uplink Doppler frequency shift results in the inability of the radio access network device to correctly track the center frequency of the received uplink signal, which reduces the demodulation performance of the radio access network device.

SUMMARY OF THE INVENTION

In view of this, the present application provides a transmission frequency adjustment method and device, which can improve the existing multi-TRP communication scenarios, because the terminal equipment cannot determine the uplink transmission frequency according to the received multiple TRS, so that the terminal equipment cannot adjust the uplink transmission frequency. It is a technical problem that the wireless access network equipment cannot correctly track the center frequency of the uplink signal received by the TRP, and the demodulation performance of the wireless access network equipment is degraded.

In a first aspect, an embodiment of the present application provides a transmission frequency adjustment method, the method includes: a terminal device measures tracking reference signals TRS respectively sent by multiple transmission and reception points TRP, and determines an uplink transmission frequency according to the reference TRP; wherein, Different TRPs correspond to different TRSs; the reference TRP is one of multiple TRPs; the terminal device sends an uplink signal at the uplink transmission frequency, and receives a frequency adjustment FA command from the reference TRP; wherein, the FA command is used to indicate a frequency adjustment parameter; The frequency adjustment parameter is determined according to the uplink signal; the terminal device adjusts the uplink transmission frequency according to the FA command.

Based on the first aspect, by using one of the multiple TRPs as a reference TRP and determining the uplink transmission frequency according to the reference TRP, the terminal device can make the wireless access network device estimate the uplink Doppler frequency shift according to the uplink transmission frequency , and then determine the frequency adjustment parameter. By adjusting the uplink transmission frequency according to the frequency adjustment parameter, the terminal equipment can reduce the Doppler frequency shift of the uplink signals received by multiple TRPs at the same time, so that the wireless access network equipment can correctly track the receiving frequency. The center frequency of the received uplink signal improves the demodulation performance of the wireless access network equipment.

In a possible design, the terminal device receives the first identification information used to indicate the reference TRP from the radio access network device.

Based on this possible design, the terminal device can determine the reference TRP according to the first identification information sent by the radio access network device, which provides a feasible solution for the terminal device to determine the reference TRP.

In a possible design, the terminal device measures downlink reference signals respectively sent by multiple TRPs; and determines the reference TRP according to the measurement results of the multiple downlink reference signals.

Based on this possible design, the terminal device can also determine the reference TRP according to the measurement result of the downlink reference signal, which provides a feasible solution for the terminal device to determine the reference TRP.

In a possible design, the measurement result of the downlink reference signal includes one or more of the following: signal strength and Doppler frequency shift.

In a possible design, the terminal device determines, according to the signal strengths of multiple downlink reference signals, the TRP corresponding to the downlink reference signal with the strongest signal strength as the reference TRP.

In a possible design, the terminal device determines the TRP corresponding to the downlink reference signal with the largest Doppler frequency shift as the reference TRP according to the Doppler frequency shifts of multiple downlink reference signals.

Based on the above three possible designs, the terminal device can determine the reference TRP according to the signal strength or the Doppler frequency shift, which is not limited.

In a possible design, the terminal device sends second identification information used to indicate the reference TRP corresponding to the terminal device.

Based on this possible design, after determining the reference TRP, the terminal device may also send the second identification information to the radio access network device, so as to indicate the reference TRP corresponding to the terminal device to the radio access network device.

In a possible design, the frequency adjustment parameter includes a pre-compensation coefficient; or, the frequency adjustment parameter includes an index of the pre-compensation coefficient; wherein the pre-compensation coefficient is one of a preset pre-compensation coefficient value set; or, the frequency adjustment Parameters include frequency adjustment values.

Based on this possible design, the frequency adjustment parameter may be a pre-compensation coefficient, a parameter of the pre-compensation coefficient, or a frequency adjustment value, which provides a feasible solution for the frequency adjustment parameter. In addition, when the frequency adjustment parameter is the pre-compensation coefficient or the index of the pre-compensation coefficient, signaling overhead can be reduced.

In a possible design, the terminal device also receives the FA command sent by one or more TRPs other than the reference TRP among the multiple TRPs.

Based on this possible design, when the terminal device receives the frequency adjustment FA command sent by the radio access network device through the reference TRP, it can also receive the radio access network through one or more TRPs other than the reference TRP among the multiple TRPs. The FA command sent by the device improves the reliability of the terminal device receiving the FA command.

In a second aspect, an embodiment of the present application provides a communication device, which can implement the functions performed by the terminal device in the first aspect or a possible design of the first aspect, and the functions can be implemented by executing corresponding software through hardware. . The hardware or software includes one or more modules corresponding to the above functions. For example, a processing module and a transceiver module; the processing module is coupled with the transceiver module. The processing module is used to measure the tracking reference signal TRS sent by the multiple transmission and reception points TRP respectively, and determine the uplink transmission frequency according to the reference TRP; wherein, different TRPs correspond to different TRSs; the reference TRP is one of the multiple TRPs; The transceiver module is used to send the uplink signal at the uplink transmission frequency, and receive the frequency adjustment FA command from the reference TRP; wherein, the FA command is used to indicate the frequency adjustment parameter; the frequency adjustment parameter is determined according to the uplink signal; the processing module is also used for according to FA command to adjust the uplink transmission frequency.

It should be noted that, for the specific implementation of the communication device, reference may also be made to the behavior function of the terminal device in the transmission frequency adjustment method provided by the first aspect or any possible design of the first aspect, and the technology brought by the communication device. For the effect, reference may also be made to the technical effect brought by any of the possible designs of the first aspect above, which will not be repeated.

In a third aspect, an embodiment of the present application provides a communication device, and the communication device may be a communication device or a chip or a system-on-chip in the communication device. The communication apparatus can implement the functions performed by the terminal equipment in the above aspects or possible designs, and the functions can be implemented by hardware. In a possible design, the communication device may include: a processor and a transceiver. The processor and the transceiver may be used to support the communication device to implement the functions involved in the first aspect or any possible design of the first aspect. For example, the processor can be used to measure the tracking reference signals TRS respectively sent by multiple transmission and reception points TRP, and determine the uplink transmission frequency according to the reference TRP; wherein, different TRPs correspond to different TRSs; the reference TRP is one of the multiple TRPs One; the transceiver can be used to send the uplink signal at the uplink transmission frequency, and receive the frequency adjustment FA command from the reference TRP; wherein, the FA command is used to indicate the frequency adjustment parameter; the frequency adjustment parameter is determined according to the uplink signal; the processor can also use To adjust the uplink transmission frequency according to the FA command. In yet another possible design, the communication apparatus may further include a memory for storing necessary computer-executed instructions and data of the terminal device. When the communication device is in operation, the transceiver and processor execute the computer-implemented instructions stored in the memory to cause the communication device to perform the transmission frequency as described in the first aspect above or any possible design of the first aspect adjustment method.

For the specific implementation of the communication apparatus in the third aspect, reference may be made to the behavior function of the terminal device in the transmission frequency adjustment method provided in the first aspect or any possible design of the first aspect.

In a fourth aspect, an embodiment of the present application provides a method for adjusting a transmission frequency. The method includes: a wireless access network device sends a tracking reference signal TRS to a terminal device through a plurality of transmission and reception points TRP, and receives an uplink from the terminal device. signal; wherein, different TRPs correspond to different TRSs, and the uplink transmission frequency of the uplink signal is determined according to the reference TRP; the reference TRP is one of multiple TRPs; the radio access network equipment determines the frequency adjustment parameter according to the uplink signal, and passes the reference The TRP sends a frequency adjustment FA command to the terminal device, wherein the FA command is used to indicate frequency adjustment parameters.

Based on the fourth aspect, the wireless access network device sends TRS to the terminal device through multiple TRPs, so that the terminal device can use one of the multiple TRPs as a reference TRP, and determine the uplink transmission frequency according to the reference TRP, and the wireless access network The device can estimate the uplink Doppler frequency shift according to the uplink transmission frequency, and then determine the frequency adjustment parameter, so that the terminal device can adjust the uplink transmission frequency according to the frequency adjustment parameter, which can reduce the frequency of uplink signals received by multiple TRPs at the same time. Doppler frequency shift enables the wireless access network equipment to correctly track the center frequency of the received uplink signal and improves the demodulation performance of the wireless access network equipment.

In a possible design, the radio access network device sends the first identification information for indicating the reference TRP to the terminal device.

Based on this possible design, the radio access network device can send the first identification information to the terminal device, so that the terminal device determines the reference TRP according to the first identification information, which provides a feasible solution for the terminal device to determine the reference TRP.

In a possible design, the radio access network device receives second identification information from the terminal device that is used to indicate the reference TRP corresponding to the terminal device.

Based on this possible design, the radio access network device may determine the reference TRP corresponding to the terminal device according to the second identification information sent by the terminal device.

In a possible design, the radio access network device also sends the FA command to the terminal device through one or more TRPs other than the reference TRP among the multiple TRPs.

Based on this possible design, when the wireless access network device sends the FA command to the terminal device through the reference TRP, it can also send the FA command to the terminal device through one or more TRPs other than the reference TRP among the multiple TRPs, so as to improve the The reliability of the terminal device receiving FA commands.

In a fifth aspect, an embodiment of the present application provides a communication device, which can implement the functions performed by the wireless access network equipment in the fourth aspect or a possible design of the fourth aspect, and the functions can be performed by hardware corresponding to software implementation. The hardware or software includes one or more modules corresponding to the above functions. For example, a transceiver module and a processing module; the transceiver module is coupled with the processing module. The transceiver module is used to send the tracking reference signal TRS to the terminal equipment through a plurality of transmission and reception points TRP respectively, and receive the uplink signal from the terminal equipment; wherein, different TRPs correspond to different TRSs; the uplink transmission frequency of the uplink signal is based on the reference TRP Determine; the reference TRP is one of multiple TRPs; the processing module is used to determine the frequency adjustment parameter according to the uplink signal; the transceiver module is also used to send the frequency adjustment FA command to the terminal device through the reference TRP; wherein, the FA command is used for Indicates the frequency adjustment parameter.

It should be noted that, for the specific implementation of the communication device, reference may also be made to the behavior function of the radio access network device in the transmission frequency adjustment method provided by the fourth aspect or any possible design of the fourth aspect. For the technical effect obtained, reference may also be made to the technical effect brought by any possible design of the fourth aspect above, which will not be repeated.

In a sixth aspect, an embodiment of the present application provides a communication device, where the communication device may be a communication device or a chip or a system-on-chip in the communication device. The communication apparatus may implement the functions performed by the radio access network equipment in the above aspects or possible designs, and the functions may be implemented by hardware. In a possible design, the communication device may include: a transceiver and a processor. The transceiver and the processor may be used to support the communication device to implement the functions involved in the fourth aspect or any of the possible designs of the fourth aspect. For example, the transceiver can be used to send the tracking reference signal TRS to the terminal equipment through multiple transmission and reception points TRP respectively, and receive the uplink signal from the terminal equipment; wherein, different TRPs correspond to different TRSs; the uplink transmission frequency of the uplink signal is based on The reference TRP is determined; the reference TRP is one of multiple TRPs; the processor can be used to determine the frequency adjustment parameter according to the uplink signal; the transceiver can also be used to send a frequency adjustment FA command to the terminal device through the reference TRP; wherein, the FA command Used to indicate frequency adjustment parameters. In yet another possible design, the communication apparatus may further include a memory for storing necessary computer-executed instructions and data of the wireless access network device. When the communication device is in operation, the transceiver and processor execute the computer-executable instructions stored in the memory to cause the communication device to perform the transmission frequency as described in the fourth aspect above or any possible design of the fourth aspect adjustment method.

For the specific implementation of the communication apparatus in the sixth aspect, reference may be made to the behavior function of the radio access network device in the transmission frequency adjustment method provided in the fourth aspect or any possible design of the fourth aspect.

In a seventh aspect, a communication device is provided, the communication device comprising one or more processors, one or more processors for running a computer program or instructions, when the one or more processors execute the computer instructions or instructions , so that the communication device executes the transmission frequency adjustment method described in the first aspect or any possible design of the first aspect; or executes the transmission frequency adjustment method described in the fourth aspect or any possible design of the fourth aspect .

In a possible design, the communication device further includes one or more communication interfaces; the one or more communication interfaces are coupled with one or more processors, and the one or more communication interfaces are used to communicate with other modules outside the communication device to communicate.

In a possible design, the communication device further includes one or more memories coupled with one or more processors, and the one or more memories are used to store the above-mentioned computer programs or instructions. In one possible implementation, the memory is located outside the communication device. In another possible implementation, the memory is located within the communication device. In this embodiment of the present application, the processor and the memory may also be integrated into one device, that is, the processor and the memory may also be integrated together.

In an eighth aspect, a communication device is provided, the communication device includes an interface circuit and a logic circuit; the interface circuit is coupled with the logic circuit; the logic circuit is used to perform the first aspect or any possible design of the first aspect. A transmission frequency adjustment method; or executing the transmission frequency adjustment method according to the fourth aspect or any possible design of the fourth aspect; the interface circuit is used for communicating with other modules other than the communication device.

In a ninth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores computer instructions or programs, and when the computer instructions or programs are executed on a computer, the computer executes the first aspect or the first aspect. The transmission frequency adjustment method described in any possible design, or the transmission frequency adjustment method described in the fourth aspect or any possible design of the fourth aspect is performed.

A tenth aspect provides a computer program product comprising computer instructions that, when run on a computer, cause the computer to perform the transmission frequency adjustment method described in the first aspect or any possible design of the first aspect, or The transmission frequency adjustment method described in the fourth aspect or any possible design of the fourth aspect is performed.

In an eleventh aspect, an embodiment of the present application provides a computer program, which, when run on a computer, causes the computer to execute the transmission frequency adjustment method described in the first aspect or any possible design of the first aspect, or execute The transmission frequency adjustment method according to the fourth aspect or any possible design of the fourth aspect.

Wherein, for the technical effect brought about by any one of the design methods in the seventh aspect to the eleventh aspect, reference may be made to the technical effect brought about by any possible design of the above-mentioned first aspect, or refer to any of the above-mentioned fourth aspect. The technical effect brought by a possible design will not be repeated.

A twelfth aspect provides a communication system, the communication system comprising the terminal device according to any one of the second to third aspects and the wireless interface according to any one of the fifth to sixth aspects access equipment.

Description of drawings

FIG. 1a is a schematic diagram of a communication system provided by an embodiment of the present application;

FIG. 1b is a flowchart of an existing transmission frequency adjustment method provided by an embodiment of the application;

FIG. 1c is a schematic diagram of a frame structure of a random access sequence provided by an embodiment of the present application;

1d is a schematic diagram of a frame structure of a DMRS provided by an embodiment of the present application;

FIG. 1e is a schematic diagram of a communication system provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of the composition of a communication device according to an embodiment of the present application;

3 is a flowchart of a method for adjusting a transmission frequency provided by an embodiment of the present application;

4 is a schematic diagram of communication between a TRS and a terminal device according to an embodiment of the present application;

5 is a schematic diagram of a frame structure of a TRS provided by an embodiment of the present application;

6 is a graph of a correspondence between a Doppler frequency shift and a pre-compensation coefficient according to an embodiment of the present application;

FIG. 7 is a schematic diagram of the composition of a terminal device according to an embodiment of the present application;

FIG. 8 is a schematic diagram of the composition of a wireless access network device according to an embodiment of the present application.

Detailed ways

Before describing the embodiments of the present application, the technical terms involved in the embodiments of the present application are described.

Doppler shift: When there is relative motion between the sending device and the receiving device, when the sending device communicates with the receiving device, the center frequency of the received signal may be offset relative to the center frequency of the sent signal. The offset value may be referred to as the Doppler shift.

Among them, the Doppler frequency shift may be proportional to the relative motion speed between the receiving device and the transmitting device, that is, f _d =v/c*f _c ; where f _d is the Doppler frequency shift, v is the relative motion speed, c is the speed of light, and f _c is the center frequency of the transmitted signal. When the relative motion speed is large, the Doppler frequency shift will also be large.

It should be noted that when the receiving device moves toward the transmitting device, the Doppler frequency shift is positive; when the receiving device moves away from the transmitting device, the Doppler frequency shift is negative.

Exemplarily, taking the wireless access network equipment communicating with the terminal equipment through a transmission reception point (TRP) as an example, as shown in FIG. 1a, when the terminal equipment travels between TRP1 and TRP2, TRP1 can send The terminal equipment transmits a downlink signal with a center frequency of _fc (for example, a tracking reference signal (TRS)). Due to the relative motion between the terminal equipment and TRP1, the center frequency of the downlink signal received by the terminal equipment may change. is f _c +f _d1 , where f _d1 is the downlink Doppler frequency shift. After receiving the downlink signal, the terminal device can send an uplink signal (for example, a physical uplink shared channel (PUSCH), a physical uplink control channel (physical uplink control channel) to TRP1 based on the center frequency f _c +f _d1 of the downlink signal channel, PUCCH)), due to the relative motion between the terminal device and the TRP1, the center frequency of the uplink signal received by the TRP1 may become f _c +2f _d1 , where 2f _d1 is the uplink Doppler frequency shift. Similarly, for TRP2, f _d2 and 2f _d2 are the downlink Doppler frequency shift and the uplink Doppler frequency shift of the terminal equipment corresponding to TRP2, respectively.

Based on the above description of the Doppler frequency shift, when the wireless access network equipment communicates with the terminal equipment through the TRP, if the Doppler frequency shift of the uplink signal received by the TRP is large, it may exceed the wireless access network equipment. The capability of estimating the uplink Doppler frequency shift results in the inability of the radio access network device to correctly track the center frequency of the received uplink signal, which reduces the demodulation performance of the radio access network device.

Based on the above problem, as shown in FIG. 1b, the wireless access network device can use the following steps 101 to 110 to send a frequency adjustment (FA) command to the terminal device, so that the terminal device can adjust the uplink transmission according to the FA command. frequency, thereby reducing the Doppler frequency shift of the uplink signal received by the TRP and improving the demodulation performance of the wireless access network equipment.

Step 101: The terminal device sends a random access sequence to the radio access network device.

The terminal device may send the random access sequence to the radio access network device through the random access channel and through the TRP.

Step 102: The radio access network device estimates the initial Doppler frequency shift according to the random access sequence.

Exemplarily, taking the random access sequence received by the radio access network device as the random access sequence shown in FIG. 1c as an example, the random access sequence may include a cyclic prefix (cyclic prefix, CP) and N repeated Time domain sequence r; wherein, the length of each time domain sequence r is M; based on the random access sequence, the radio access network device can estimate the initial Doppler frequency shift according to the following formula:

Among them, f _d is the initial Doppler frequency shift; t is the time interval between the initial samples of two adjacent sequences r, and the unit can be seconds; L _cp is the number of samples of CP.

Step 103: The wireless access network device determines the FA value according to the initial Doppler frequency shift.

Exemplarily, the radio access network device may quantify the initial Doppler frequency shift according to a certain ratio to obtain the FA value.

E.g,

The initial Doppler frequency shift; wherein, n can be pre-specified by the communication protocol, or can be customized by the wireless access network device, which is not limited.

Step 104: The wireless access network device sends an FA command carrying the FA value to the terminal device.

The wireless access network device may send the FA command carrying the FA value to the terminal device through TRP.

Exemplarily, the radio access network device may send the FA command to the terminal device through random access response (random access response, RAR) signaling or media access control (media access control, MAC) signaling and other signaling.

Step 105: The terminal device adjusts the uplink transmission frequency according to the FA command.

Exemplarily, the terminal device may determine the FA value according to the FA command, and determine the difference between the current uplink transmission frequency and the FA value as the adjusted uplink transmission frequency.

For example, taking the current uplink transmission frequency as f _c +f _d as an example, the terminal device can adjust the uplink transmission frequency from f _c +f _d to f _c +f _d -FA value according to the received FA command.

Step 106: The terminal device sends an uplink signal to the wireless access network device according to the adjusted uplink transmission frequency.

The uplink signal may include a demodulation reference signal (demodulation reference signal, DMRS).

Exemplarily, the uplink signal may be PUCCH, PUSCH, etc., which is not limited.

Specifically, after the random access is successful, the terminal device may use the adjusted uplink transmission frequency to send the uplink signal to the wireless access network device through TRP.

Step 107: The radio access network device estimates the Doppler frequency shift according to the uplink signal.

The radio access network equipment may estimate the Doppler frequency shift according to the DMRS in the uplink signal.

Exemplarily, taking the position of the DMRS received by the radio access network device in a time slot (slot) as shown in Figure 1d as an example, it is assumed that the DMRS sent by the terminal device in the M frequency domains in a slot is x= _[ _x ₁ , _x ₂ _, _. r ₂ =[r ₂₁ , r ₂₂ ,...,r _2N ],...,r _M =[r _M1 ,r _M2 ,...,r _MN ], where N is an orthogonal frequency division multiplexing , the number of DMRS signals mapped in the OFDM) symbol. Then the wireless access network device can first divide each element in r ₁ , r ₂ , ..., r _M by each element in x, to obtain h ₁ =[h ₁₁ , h ₁₂ , ..., h _1N ], h ₂ =[h ₂₁ , h ₂₂ ,...,h _2N ],...,h _M =[h _M1 ,h _M2 ,...,h _MN ]; then the Doppler shift is estimated according to the following formula:

Wherein, t may be the time interval of the respective OFDM symbols where each column of DMRSs is located, and the unit may be seconds.

It should be noted that the maximum Doppler frequency shift that can be estimated by the radio access network device is related to the interval of the DMRS.

Step 108: The wireless access network device determines the FA value according to the Doppler frequency shift.

The specific process for the wireless access network device to determine the FA value according to the Doppler frequency shift may refer to the foregoing step 103, which will not be repeated.

Step 109: The wireless access network device sends an FA command carrying the FA value to the terminal device.

Wherein, the wireless access network device may send the FA command to the terminal device through PDSCH or MAC when the variation of the FA value exceeds the preset threshold.

Exemplarily, taking the FA value previously determined by the wireless access network device as FA1 and the currently determined FA value as FA2 as an example, the wireless access network device may send a message to the terminal when the difference between FA1 and FA2 exceeds a preset threshold. The device sends the FA command.

Step 110: The terminal device adjusts the uplink transmission frequency according to the FA command.

The specific process of step 110 may refer to the above-mentioned step 105, which will not be repeated.

However, when the wireless access network device includes multiple TRPs, the wireless access network device can send multiple TRSs to the terminal device through the multiple TRPs, and the terminal device cannot determine the uplink transmission frequency according to the multiple TRSs received, resulting in the wireless access network. The network access device cannot estimate the uplink Doppler frequency shift, and thus cannot determine the FA value, so that the terminal device cannot adjust the uplink transmission frequency according to the FA value, and cannot simultaneously reduce the Doppler frequency shift of the uplink signals received by multiple TRPs. When the Doppler frequency shift of the uplink signal received by the wireless access network equipment is large, it may exceed the ability of the wireless access network equipment to estimate the uplink Doppler frequency shift, so that the wireless access network equipment cannot correctly track the received signal. The center frequency of the uplink signal, which degrades the demodulation performance of the wireless access network equipment.

In order to solve the above problem, an embodiment of the present application provides a transmission frequency adjustment method, in which the terminal device can measure the TRSs sent by multiple TRPs respectively, and determine the uplink transmission frequency according to the reference TRP; different TRPs correspond to different TRSs; reference TRP is one of multiple TRPs; the terminal device can also send uplink signals at the uplink transmission frequency; and receives the FA command from the reference TRP, and adjusts the uplink transmission frequency according to the FA command; wherein, the FA command is used to indicate the frequency Adjustment parameters; frequency adjustment parameters are determined according to the uplink signal.

In the embodiment of the present application, the terminal device uses one TRP among multiple TRPs as a reference TRP and determines the uplink transmission frequency according to the reference TRP, so that the wireless access network device can estimate the uplink Doppler frequency according to the uplink transmission frequency By adjusting the uplink transmission frequency according to the frequency adjustment parameter, the terminal equipment can reduce the Doppler frequency shift of the uplink signals received by multiple TRPs at the same time, so that the wireless access network equipment can correctly track The center frequency of the received uplink signal improves the demodulation performance of the wireless access network equipment.

The implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The transmission frequency adjustment method provided in the embodiments of the present application can be used in any communication system, and the communication system can be a third generation partnership project (3GPP) communication system, for example, long term evolution (LTE) The system can also be the fifth generation (5G) mobile communication system, the new radio (NR) system, the new radio (vehicle to everything, NR V2X) system, and can also be applied to LTE and 5G hybrid systems In networked systems, or device-to-device (D2D) communication systems, machine-to-machine (M2M) communication systems, Internet of Things (IoT), and other next-generation communications The system may also be a non-3GPP communication system, which is not limited.

The sending frequency adjustment method provided in the embodiment of the present application can be applied to various communication scenarios, for example, can be applied to one or more of the following communication scenarios: enhanced mobile broadband (eMBB), ultra-reliable low-latency communication Communication scenarios such as (ultra reliable low latency communication, URLLC), machine type communication (MTC), massive machine type communication (mMTC), D2D, V2X, IoT, high-speed rail communication, etc. are not limited .

The method for adjusting the transmission frequency provided by the embodiment of the present application is described below by taking FIG. 1e as an example.

FIG. 1e is a schematic diagram of a communication system provided by an embodiment of the application. As shown in FIG. 1e, the communication system may include terminal equipment and wireless access network equipment. Wherein, the wireless access network device may be connected to the terminal device through a plurality of TRPs for communication.

Wherein, the terminal equipment in FIG. 1e may be located within the beam/cell coverage of the radio access network equipment. The terminal device may perform air interface communication with the radio access network device through an uplink (uplink, UL) or a downlink (downlink, DL). For example, in the UL direction, the terminal device can send uplink data to the radio access network device through the uplink physical layer shared channel (PUSCH); in the DL direction, the radio access network device can pass the downlink physical layer A layer shared channel (physical downlink shared channel, PDSCH) sends downlink data to terminal equipment.

The terminal device (terminal) in FIG. 1e may be a terminal device supporting a new air interface, and may access the communication system through the air interface, and initiate services such as calling and surfing the Internet. The terminal equipment may also be referred to as user equipment (user equipment, UE), or a mobile station (mobile station, MS) or a mobile terminal (mobile terminal, MT). Specifically, the terminal device in FIG. 1b may be a mobile phone (mobile phone), a tablet computer or a computer with a wireless transceiver function. It can also be a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, and a wireless terminal in smart grid. terminals, wireless terminals in smart cities, wireless terminals in smart homes, in-vehicle terminals, vehicles with vehicle-to-vehicle (V2V) communication capabilities, intelligent networked vehicles, There are no restrictions on UAVs with UAV to UAV (U2U) communication capabilities.

The wireless radio access network device in FIG. 1e can be any device with wireless transceiver function, which is mainly used to realize functions such as wireless physical control function, resource scheduling and wireless resource management, wireless access control and mobility management, etc. Reliable wireless transmission protocol and data encryption protocol, etc. Specifically, the wireless access network device may be a device supporting wired access or a device supporting wireless access. Exemplarily, the radio access network device may be an access network (access network, AN)/radio access network (radio access network, RAN) device, which is composed of multiple 5G-AN/5G-RAN nodes. 5G-AN/5G-RAN nodes can be: access point (AP), base station (nodeB, NB), enhanced base station (enhance nodeB, eNB), next-generation base station (NR nodeB, gNB), transmission and reception A transmission reception point (TRP), a transmission point (TP), or some other access node, etc.

During specific implementation, as shown in FIG. 1e , for example, each terminal device and wireless access network device may adopt the composition structure shown in FIG. 2 , or include the components shown in FIG. 2 . FIG. 2 is a schematic diagram of the composition of a communication apparatus 200 according to an embodiment of the present application. The communication apparatus 200 may be a terminal device or a chip or a system-on-chip in the terminal device; it may also be a wireless access network device or a wireless access network device chip or system-on-chip. As shown in FIG. 2 , the communication device 200 includes a processor 201 , a transceiver 202 and a communication line 203 .

Further, the communication apparatus 200 may further include a memory 204 . The processor 201 , the memory 204 and the transceiver 202 may be connected through a communication line 203 .

The processor 201 is a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, Programmable logic device (PLD) or any combination thereof. The processor 201 may also be other apparatuses having processing functions, such as circuits, devices or software modules, which are not limited.

Transceiver 202 for communicating with other devices or other communication networks. The other communication network may be Ethernet, radio access network (RAN), wireless local area networks (WLAN) and the like. Transceiver 202 may be a module, circuit, transceiver, or any device capable of enabling communication.

The communication line 203 is used to transmit information between components included in the communication device 200 .

Memory 204 for storing instructions. Wherein, the instructions may be computer programs.

The memory 204 may be a read-only memory (ROM) or other types of static storage devices that can store static information and/or instructions, or a random access memory (RAM) or a random access memory (RAM). Other types of dynamic storage devices that store information and/or instructions, and may also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD- ROM) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

It should be pointed out that the memory 204 may exist independently of the processor 201 , or may be integrated with the processor 201 . The memory 204 may be used to store instructions or program code or some data or the like. The memory 204 may be located in the communication device 200, or may be located outside the communication device 200, which is not limited. The processor 201 is configured to execute the instructions stored in the memory 204 to implement the sending frequency adjustment method provided by the following embodiments of the present application.

In one example, the processor 201 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 2 .

As an optional implementation manner, the communication apparatus 200 includes a plurality of processors, for example, in addition to the processor 201 in FIG. 2 , a processor 207 may also be included.

As an optional implementation manner, the communication apparatus 200 further includes an output device 205 and an input device 206 . Illustratively, the input device 206 is a device such as a keyboard, a mouse, a microphone or a joystick, and the output device 205 is a device such as a display screen, a speaker, and the like.

It should be noted that the communication apparatus 200 may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system or a device with a similar structure in FIG. 2 . In addition, the composition shown in FIG. 2 does not constitute a limitation on the communication device. In addition to the components shown in FIG. 2, the communication device may include more or less components than those shown in the figure, or combine some components , or a different component arrangement.

In this embodiment of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

In addition, actions, terms, etc. involved in the various embodiments of the present application can be referred to each other, and are not limited. In the embodiments of the present application, the names of the messages or the names of parameters in the messages exchanged between the devices are just an example, and other names may also be used in the specific implementation, which is not limited.

The method for adjusting the transmission frequency provided by the embodiment of the present application will be described below with reference to the following FIG. 3 in conjunction with the communication system shown in FIG. 1e, wherein the terminal device may be any terminal device in the communication system shown in FIG. The network device may be any wireless access network device in the communication system shown in FIG. 1e. Both the terminal device and the wireless access network device described in the following embodiments may have the components shown in FIG. 2 .

FIG. 3 is a flowchart of a method for adjusting a transmission frequency provided by an embodiment of the present application. As shown in FIG. 3 , the method may include:

Step 301: The wireless access network device sends TRS to the terminal device respectively through multiple TRPs.

Among them, different TRPs correspond to different TRSs.

Exemplarily, the TRS may be a 1-port channel state information reference signal (channel state information reference signal, CSI-RS) resource with a density of 3, and the TRS symbol interval in a time slot is 4. For the low frequency band, the upper layer can configure a CSI-RS resource set containing 4 periodic CSI-RS resources for the terminal equipment. These 4 CSI-RS resources are distributed in two consecutive time slots, and each time slot contains two Periodic CSI-RS resources, and the positions of the CSI-RS resources in the two time slots are the same in the time domain. For the high frequency band, the higher layer can configure a CSI-RS resource set for the terminal device that includes two periodic CSI-RS distributed in one time slot, or configure a CSI-RS resource set that includes four periodic CSI-RS distributed in two consecutive time slots - A CSI-RS resource set of RS resources, each time slot contains two periodic CSI-RS resources, and the CSI-RS resources in the two time slots are located in the same time domain.

Exemplarily, taking the multiple TRPs including TRP1 and TRP2 as an example, the wireless access network device can send TRS1 with a center frequency f _c to the terminal device through TRP1, or can send a TRS2 with a center frequency f _c to the terminal device through TRP2. .

Optionally, when the wireless access network device sends the TRS to the terminal device through the TRP, the TRS may be carried in the physical downlink shared channel (physical downlink shared channel, PDSCH) or the physical downlink control channel (physical downlink control channel, PDCCH), Sent to the terminal device via TRP.

Step 302: The terminal device determines the uplink transmission frequency according to the reference TRP.

Wherein, the terminal device may obtain TRSs respectively sent by multiple TRPs through measurement, and determine one TRP among the multiple TRPs as the reference TRP.

In a possible design, the terminal device receives the first identification information from the radio access network device; wherein the first identification information is used to indicate the reference TRP.

Wherein, the first identification information may be identification information such as an ID of the reference TRP, an IP address, etc., which may be used to indicate the reference TRP, which is not limited.

Exemplarily, the wireless access network device may, according to a certain plan, divide the network into multiple coverage areas, designate a TRP as the reference TRP for the divided coverage areas, and send the first identification information corresponding to the reference TRP to the reference TRP. Terminal devices within coverage.

Exemplarily, the terminal device may also send its own location information to the wireless access network device, so that the wireless access network device determines the reference TRP corresponding to the terminal device according to the location information of the terminal device, and sends the reference TRP to the terminal device. corresponding first identification information.

In another example, the terminal device may also measure the downlink reference signals sent by the radio access network device through multiple TRPs, obtain the signal strength of the downlink reference signals corresponding to each TRP, and calculate the signal strength of the downlink reference signals corresponding to each TRP. The signal strength is sent to the wireless access network equipment, and the wireless access network equipment determines the reference TRP corresponding to the terminal equipment according to the signal strength of each downlink reference signal corresponding to the terminal equipment, and sends the first identification information corresponding to the reference TRP to the terminal equipment. .

The radio access network device may determine, among the downlink reference signals corresponding to the terminal device, the TRP corresponding to the downlink reference signal with the highest signal strength as the reference TRP corresponding to the terminal device.

Optionally, the downlink reference signal is a reference signal such as TRS, CSI-RS, DMRS, and synchronization signal (synchronization signal, SS), which is not limited.

Optionally, the terminal device can use the reference signal received power (reference signal received power, RSRP), reference signal received quality (reference signal received quality, RSRQ), signal to interference plus noise ratio (signal to interference plus noise ratio, SINR), etc. Based on the parameter indicating the signal strength, the signal strength of the downlink reference signal is determined.

For example, taking the wireless access network equipment sending TRS1, TRS2, TRS3 to the terminal equipment through TRP1, TRP2, and TRP3 as an example, the terminal equipment can measure the received TRS1, TRS2, and TRS3 to obtain the signal strength of TRS1, the signal strength of TRS2, and the signal strength of TRS2. Signal strength, TRS3 signal strength, and send the TRS1 signal strength, TRS2 signal strength, and TRS3 signal strength to the wireless access network equipment, and the wireless access network equipment Signal strength, determine the TRS with the highest signal strength, assuming that the TRS with the highest signal strength is TRS1, the wireless access network device can determine the TRP1 corresponding to TRS1 as the reference TRP corresponding to the terminal device, and send the first identification information corresponding to TRP1 to the terminal device.

It should be noted that the terminal device may also send the magnitude relationship between the signal strengths of each downlink reference signal to the radio access network device according to the signal strength of each downlink reference signal, and the radio access network device determines the reference according to the magnitude relationship. TRP.

For example, taking the magnitude relationship between the signal strengths of each downlink reference signal TRS determined by the terminal device as: TRS1>TRS3>TRS2 as an example, the terminal device can send the magnitude relationship to the radio access network device, and the radio access network device can send the magnitude relationship to the radio access network device according to For the size relationship, the TRP corresponding to TRS1 is determined as the reference TRP corresponding to the terminal device, and the first identification information corresponding to the reference TRP is sent to the terminal device.

Similarly, the terminal equipment can also perform Doppler shift estimation on the downlink reference signals sent by the wireless access network equipment through multiple TRPs, obtain the Doppler frequency shifts of the downlink reference signals corresponding to each TRP, and assign each TRP corresponding to the Doppler frequency shift. The Doppler frequency shift of the downlink reference signal is sent to the wireless access network device, and the wireless access network device determines the reference TRP corresponding to the terminal device according to the Doppler frequency shift of each downlink reference signal corresponding to the terminal device, and sends it to the wireless access network device. The terminal device sends the first identification information corresponding to the reference TRP.

The radio access network device may determine the TRP corresponding to the downlink reference signal with the largest Doppler frequency shift among the downlink reference signals corresponding to the terminal device as the reference TRP corresponding to the terminal device.

In another example, the wireless access network device measures the uplink reference signals sent by the terminal device through multiple TRPs, obtains the signal strength of the uplink reference signals corresponding to each TRP, and obtains the signal strength of the uplink reference signals corresponding to each TRP according to the signal strength of the uplink reference signals corresponding to each TRP. , determine the reference TRP corresponding to the terminal device, and send the first identification information corresponding to the reference TRP to the terminal device.

The wireless access network device may determine, among the uplink reference signals corresponding to each TRP, the TRP corresponding to the uplink reference signal with the highest signal strength as the reference TRP corresponding to the terminal device.

Optionally, the uplink reference signal may be a channel sounding reference signal (sounding reference signal, SRS), DMRS and other reference signals, which are not limited.

Optionally, the terminal device determines the signal strength of the downlink reference signal according to parameters such as RSRP, RSRQ, and SINR that can be used to indicate signal strength.

For example, taking the terminal equipment sending SRS1, SRS2 and SRS3 to the wireless access network equipment respectively through TRP1, TRP2 and TRP3 as an example, the wireless access network equipment can measure the received SRS1, SRS2 and SRS3 to obtain the signal of SRS1 strength, signal strength of SRS2, and signal strength of SRS3. Assuming that the wireless access network equipment determines that the SRS with the highest signal strength is SRS1 according to the signal strength of SRS1, the signal strength of SRS2, and the signal strength of SRS3, the wireless access network equipment can The TRP1 corresponding to the SRS1 is determined as the reference TRP corresponding to the terminal device, and the first identification information corresponding to the TRP1 is sent to the terminal device.

Similarly, the wireless access network equipment may also perform Doppler frequency shift estimation on the uplink reference signals sent by the terminal equipment through multiple TRPs to obtain the Doppler frequency shifts of the uplink reference signals corresponding to the respective TRPs, and determine the Doppler frequency shifts of the uplink reference signals corresponding to the respective TRPs. The Doppler frequency shift of the uplink reference signal is determined, the reference TRP corresponding to the terminal device is determined, and the first identification information corresponding to the reference TRP is sent to the terminal device.

The radio access network device may determine, among the uplink reference signals corresponding to each TRP, the TRP corresponding to the uplink reference signal with the largest Doppler frequency shift as the reference TRP corresponding to the terminal device.

For example, taking the terminal equipment sending DMRS1, DMRS2, and DMRS3 to the wireless access network equipment respectively through TRP1, TRP2, and TRP3 as an example, the wireless access network equipment can perform Doppler frequency shift estimation on the received DMRS1, DMRS2, and DMRS3. , obtain the Doppler frequency shift of DMRS1, the Doppler frequency shift of DMRS2, and the Doppler frequency shift of DMRS3, assuming that the wireless access network equipment is based on the Doppler frequency shift of DMRS1, the Doppler frequency shift of DMRS2, the Doppler frequency shift of DMRS3 If it is determined that the DMRS with the largest Doppler frequency shift is DMRS1, the wireless access network device can determine the TRP1 corresponding to DMRS1 as the reference TRP corresponding to the terminal device, and send the first identification information corresponding to TRP1 to the terminal device.

Optionally, the wireless access network device sends the first identification information corresponding to the reference TRP to the terminal devices within the coverage area corresponding to the reference TRP in a multicast manner.

For example, it is determined by wireless access network equipment that coverage area 1 corresponds to reference TRP1, and coverage area 2 corresponds to reference TRP2. It is assumed that coverage area 1 includes terminal equipment 1, terminal equipment 2, and terminal equipment 3, and coverage area 2 includes terminal equipment 4, The terminal equipment 5 and the terminal equipment 6, the wireless access network equipment can send the first identification information corresponding to the reference TRP1 to the terminal equipment 1, the terminal equipment 2, and the terminal equipment 3 in a multicast manner, and send the first identification information corresponding to the reference TRP1 to the terminal equipment 4 in a multicast manner. . The terminal device 5 and the terminal device 6 send the first identification information corresponding to the reference TRP2.

It should be noted that the wireless access network device may send the first identification information to the terminal device through the reference TRP, or may send the first identification information to the terminal device through the non-reference TRP, which is not limited.

In another possible design, the terminal device measures downlink reference signals respectively sent by multiple TRPs; and determines the reference TRP according to the measurement results of the multiple downlink reference signals.

Wherein, the downlink reference signal may be a reference signal such as TRS, CSI-RS, DMRS, SS, etc., which is not limited.

Exemplarily, the measurement result of the downlink reference signal may include one or more of the following: signal strength, Doppler frequency shift.

When the measurement result of the downlink reference signal is the signal strength, the terminal device may determine the TRP corresponding to the downlink reference signal with the strongest signal strength as the reference TRP according to the signal strengths of multiple downlink reference signals.

The terminal device may determine the signal strength of the downlink reference signal according to parameters such as RSRP, RSRQ, and SINR that can be used to indicate signal strength.

When the measurement result of the downlink reference signal is Doppler frequency shift, the terminal equipment can perform Doppler frequency shift estimation on each downlink reference signal to obtain the Doppler frequency shift of each downlink reference signal, and calculate the Doppler frequency shift of each downlink reference signal. The TRP corresponding to the downlink reference signal with the largest frequency shift is determined as the reference TRP.

Exemplarily, assuming that the downlink reference signal is the TRS sent by the wireless access network device to the terminal device through multiple TRPs in the above step 301 as an example, the terminal device can perform Doppler frequency shift estimation for each TRS in the following manner: Get the Doppler shift for each TRS:

Taking the position of the TRS received by the terminal device in a time slot (slot) as shown in Figure 5 as an example, it is assumed that the TRS sent by the wireless access network device through the TRP in M frequency domains in a slot is x=[x ₁ _, _x ₂ _, _. _{_} _{_} _{_} r ₂₂ , . . . , r _2N ], where N is the number of TRS signals mapped in one OFDM symbol. Then the terminal device can first divide each element in r ₁ and r ₂ by each element in x respectively to obtain h ₁ =[h ₁₁ , h ₁₂ , . . . , h _1N ] and h ₂ =[h ₂₁ , h ₂₂ , ..., h _2N ]; then the terminal device can estimate the Doppler shift of the TRS according to the following formula:

Wherein, t may be the time interval of the respective OFDM symbols where the two columns of TRSs are located, and the unit may be seconds.

It should be noted that the maximum Doppler frequency shift that can be estimated by the terminal device is related to the interval of the TRS.

Wherein, after estimating the Doppler frequency shift of each TRS according to the above method, the terminal device may determine the TRP corresponding to the TRS with the largest Doppler frequency shift as the reference TRP.

Further, after determining the reference TRP according to the downlink reference signal, the terminal device may send the second identification information to the radio access network device.

The second identification information may be used to indicate the reference TRP corresponding to the terminal device.

Exemplarily, the second identification information may be the ID of the reference TRP, the IP address, etc., which may be used to indicate the identification information of the reference TRP, which is not limited.

It should be noted that the terminal device may send the second identification information to the wireless access network device through the reference TRP, or may send the second identification information to the wireless access network device through the non-reference TRP, which is not limited.

Based on the above two possible designs, after the terminal device determines the reference TRP, the terminal device can determine the Doppler frequency shift of the TRS according to the TRS corresponding to the reference TRP, and determine the Doppler frequency shift of the TRS according to the center frequency of the TRS and the Doppler frequency of the TRS. Frequency shift to determine the uplink transmission frequency.

Exemplarily, the terminal device may determine the sum of the center frequency of the TRS corresponding to the reference TRP and the Doppler frequency shift of the TRS as the uplink transmission frequency.

For example, as shown in FIG. 4 , taking the reference TRP corresponding to TRS1 as an example, it is assumed that the center frequency of TRS1 is f _c , and the Doppler frequency shift estimated by the terminal device according to TRS1 is f _dri ; then the terminal device can convert f _c +f The _dri is determined as the uplink sending frequency when the terminal device sends the uplink signal 1 to the reference TRP.

The terminal device may estimate the Doppler frequency shift of the TRS according to the method shown in FIG. 5 , which will not be repeated.

It should be noted that, when the downlink reference signal is the TRS sent by the wireless access network equipment through the TRP, after determining the reference TRP according to the Doppler frequency shift of the TRS, the terminal equipment can directly use the center frequency and the center frequency of the TRS corresponding to the reference TRP. The Doppler frequency shift of the TRS determines the uplink transmission frequency.

Step 303: The terminal device transmits an uplink signal at the uplink transmission frequency.

Wherein, the uplink signal may include DMRS.

Specifically, the terminal device may send the uplink signal 1 to the radio access network device by referring to the TRP on the uplink transmission frequency.

Exemplarily, the uplink signal may be PUCCH, PUSCH, etc., which is not limited.

It should be noted that when the terminal device needs to send the uplink signal 2 to the non-reference TRP, the terminal device can also send the uplink signal 2 to the non-reference TRP through the uplink transmission frequency f _c +f _dri .

Step 304: The wireless access network device determines a frequency adjustment parameter according to the uplink signal.

The wireless access network device may receive the uplink signal sent by the terminal device by referring to the TRP, perform Doppler frequency shift estimation on the uplink signal, and determine the frequency adjustment parameter according to the estimated Doppler frequency shift.

Exemplarily, the radio access network device may refer to the method described above when describing FIG. 1d, and estimate the Doppler frequency shift of the uplink signal received by referring to the TRP according to the DMRS in the uplink signal, which will not be repeated.

For example, as shown in FIG. 4 , the uplink transmission frequency is f _c + f _dri as an example. Based on the uplink transmission frequency, the terminal device can send an uplink signal to the radio access network device by referring to the TRP, and the radio access network device receives the uplink signal. After the uplink signal is obtained, Doppler frequency shift estimation can be performed to determine that the Doppler frequency shift of the uplink signal received by the radio access network device by referring to the TRP is 2f _dri .

Specifically, the radio access network device may pre-configure a value set of pre-compensation coefficients through RRC signaling, and determine pre-compensation from the value set of pre-compensation coefficients according to the Doppler frequency shift of the uplink signal corresponding to the reference TRP coefficient.

For example, the set of pre-compensation coefficients may be {0, 0.5, 0.75}, and the radio access network device may select a value from the set of values as the pre-compensation coefficient.

Further, the radio access network equipment can also perform Doppler shift estimation on the uplink signal received through the non-reference TRP, and according to the Doppler frequency shift of the uplink signal corresponding to the reference TRP and the uplink signal corresponding to the non-reference TRP The Doppler frequency shift of the pre-compensation coefficient is determined from the value set of the pre-compensation coefficient.

Wherein, as shown in FIG. 6 , the absolute value of the Doppler frequency shift of the uplink signal corresponding to the reference TRP may be |2f _dri |; the absolute value of the Doppler frequency shift of the uplink signal corresponding to the non-reference TRP may be |f _dri |+|f _dmi |; where f _dmi is the |Doppler shift from the terminal device to the non-reference TRP.

Taking the pre-compensation coefficient as k as an example, after the terminal equipment adjusts the uplink transmission frequency f _c + f _dri according to the pre-compensation coefficient k, the radio access network equipment receives the Doppler frequency shift of the uplink signal by referring to the TRP. The absolute value can be |2f _dri -k*2f _dri |, that is, |2(1-k)*f _dri |; the Doppler frequency shift of the uplink signal received through the non-reference TRP can be |f _dri +f _dmi -k*2f _dri |, ie |(1-2k)*f _dri |+|f _dmi |.

Based on the above Figure 6, it can be seen that when 0≤k≤0.5, the Doppler frequency shift at the reference TRP and the Doppler frequency shift at the non-reference TRP decrease as k increases; when 0.5≤k≤0.5 When 1, the Doppler frequency shift at the reference TRP decreases as k increases, and the Doppler frequency shift at the non-reference TRP increases as k increases.

As shown in Table 1 below, k takes different values, and the Doppler frequency shift compensation effect corresponding to the reference TRP and the non-reference TRP is different. The wireless access network equipment can refer to the above Figure 6 and the following Table 1, according to the actual communication requirements. The k value is reasonably selected from the value set of the precompensation coefficient.

Table 1

预补偿系数kPre-compensation coefficient k	参考TRPReference TRP	非参考TRPnon-reference TRP
k＝0k=0	没补偿no compensation	没补偿no compensation
k＝0.5k=0.5	补偿一半compensate half	降低到最低值reduced to the lowest value
k＝1k=1	全补偿，多普勒频移为0Fully compensated, Doppler shift is 0	没补偿no compensation

For example, taking the set of pre-compensation coefficients as {0, 0.5, 0.75} as an example, the wireless access network device may determine that the pre-compensation coefficient is 0 when |2f _dri | is less than the first threshold _; A threshold, when it is smaller than the second threshold, the pre-compensation coefficient is determined to be 0.5, and when |2f _dri | is greater than the second threshold, the pre-compensation coefficient is determined to be 0.75.

In a possible design, the frequency adjustment parameter includes the above-mentioned pre-compensation coefficient.

Exemplarily, the radio access network device may activate a pre-compensation coefficient from a value set of pre-compensation coefficients through DCI signaling, and carry the activated pre-compensation coefficient in the DCI signaling and send it to the terminal device by referring to the TRP. .

In another example, the radio access network device can also activate a pre-compensation coefficient from the value set of pre-compensation coefficients through MAC CE signaling, and carry the activated pre-compensation coefficient in the MAC CE signaling by referring to TRP is sent to the end device.

Based on the above two possible examples, the radio access network device may activate the pre-compensation coefficient through 2-bit information in DCI signaling or MAC CE signaling.

In yet another possible design, the frequency adjustment parameter includes an index of the pre-compensation coefficient.

The wireless access network device may determine a pre-compensation coefficient from the value set of pre-compensation coefficients according to the Doppler frequency shift of the uplink signal, and send the index of the determined pre-compensation coefficient to the reference TRP corresponding to the reference TRP. terminal equipment.

It should be noted that the wireless access network device may pre-configure the value set of the pre-compensation coefficient for the terminal device through RRC signaling, so that after the terminal device receives the index of the pre-compensation coefficient, Set of values to determine the pre-compensation coefficient.

Compared with the above-mentioned wireless access network device sending the activated pre-compensation coefficient to the terminal device, the wireless access network device can reduce signaling overhead by sending the index of the pre-compensation coefficient to the terminal device by referring to the TRP.

Optionally, the radio access network device sends the index of the pre-compensation coefficient to the terminal device through DCI signaling or MAC CE signaling.

In yet another possible design, the frequency adjustment parameter includes a frequency adjustment value.

Optionally, the wireless access network device determines a pre-compensation coefficient from the value set of pre-compensation coefficients according to the Doppler frequency shift of the uplink signal, and determines the pre-compensation coefficient according to the Doppler frequency shift and the pre-compensation coefficient of the uplink signal. The frequency adjustment value is sent to the terminal equipment corresponding to the reference TRP through the reference TRP.

The frequency adjustment value may be k*2f _dri , where k is the pre-compensation coefficient.

Alternatively, the wireless access network device quantifies the Doppler frequency shift of the uplink signal according to a certain proportion to obtain the frequency adjustment value.

E.g,

The initial Doppler frequency shift of the uplink signal; wherein, n can be pre-specified by the communication protocol, or can be customized by the wireless access network device, which is not limited.

Step 305: The wireless access network device sends a frequency adjustment FA command to the terminal device by referring to the TRP.

Among them, the FA command can be used to indicate the frequency adjustment parameter.

In a possible design, the radio access network device periodically sends the FA command to the terminal device by referring to the TRP.

Exemplarily, the radio access network device may pre-configure the pre-compensation period through RRC signaling, and when the pre-compensation period arrives, send the FA command to the terminal device by referring to the TRP.

Wherein, the unit of the pre-compensation period may be a time slot, an OFDM symbol or a second, etc., which is not limited.

In another possible design, when the Doppler frequency shift corresponding to the uplink signal is greater than or equal to a preset threshold, the radio access network device sends the FA command to the terminal device by referring to the TRP.

Exemplarily, the radio access network device may evaluate the Doppler frequency shift of the uplink signal, and when the Doppler frequency shift of the uplink signal is greater than or equal to a preset threshold, determine the frequency adjustment parameter, and pass the frequency adjustment parameter by reference. TRP is sent to the end device.

Further, when the wireless access network device sends the FA command to the terminal device through the reference TRP, it can also send the FA command to the terminal device through one or more non-reference TRPs, which improves the reliability of the terminal device receiving the FA command.

Step 306: The terminal device adjusts the uplink transmission frequency according to the FA command.

Exemplarily, when the FA command is used to indicate the pre-compensation coefficient, the terminal device may adjust the uplink transmission frequency according to the pre-compensation coefficient. When the FA command is used to indicate the index of the pre-compensation coefficient, the terminal device can determine the pre-compensation coefficient by the index of the pre-compensation coefficient, and adjust the uplink transmission frequency according to the pre-compensation coefficient.

For example, as shown in FIG. 4 , the uplink transmission frequency is f _c +f _dri and the pre-compensation coefficient is k as an example, the terminal device can adjust the uplink transmission frequency from f _c +f _dri to f _c +f _dri -k *2f _dri ; where k*2f _dri can also be described as FA in FIG. 4 .

Further, the terminal device may use the adjusted uplink transmission frequency to send the uplink signal to the radio access network device through multiple TRPs.

For example, taking the adjusted uplink transmission frequency f _c +f _dri -k*2f _dri as an example, the terminal device may use f _c +f _dri -k*2f _dri to send uplink signals to the wireless access network device through multiple TRPs.

Based on the method shown in FIG. 3, the terminal device can use one of the multiple TRPs as a reference TRP and determine the uplink transmission frequency according to the reference TRP, so that the wireless access network device can estimate the uplink transmission frequency according to the uplink transmission frequency. By adjusting the uplink transmission frequency according to the frequency adjustment parameter, the terminal equipment can reduce the Doppler frequency shift of the uplink signals received by multiple TRPs at the same time, so that the wireless access network equipment The center frequency of the received uplink signal can be tracked correctly, and the demodulation performance of the wireless access network equipment can be improved.

The foregoing mainly introduces the solutions provided by the embodiments of the present application from the perspective of interaction between devices. It can be understood that, in order to implement the above-mentioned functions, each device includes corresponding hardware structures and/or software modules for performing each function. Those skilled in the art should easily realize that the present application can be implemented in hardware or a combination of hardware and computer software with the algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In this embodiment of the present application, each device may be divided into functional modules according to the foregoing method examples. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.

In the case where each functional module is divided according to each function, FIG. 7 shows a terminal device, and the terminal device 70 may include a processing module 701 and a transceiver module 702 . Exemplarily, the terminal device 70 may be a terminal device, or may be a chip applied in the terminal device or other combined devices, components, etc. having the functions of the above-mentioned terminal device. When the terminal device 70 is a terminal device, the processing module 701 may be a processor (or a processing circuit), such as a baseband processor, and the baseband processor may include one or more CPUs; the transceiver module 702 may be a transceiver, a transceiver It can include antennas and radio frequency circuits, etc. When the terminal device 70 is a component with the above-mentioned terminal device functions, the processing module 701 may be a processor (or a processing circuit), such as a baseband processor; the transceiver module 702 may be a radio frequency unit. When the terminal device 70 is a chip system, the processing module 701 may be a processor (or a processing circuit) of the chip system, and may include one or more central processing units; the transceiver module 702 may be the input and output of a chip (eg, a baseband chip). interface. It should be understood that the processing module 701 in this embodiment of the present application may be implemented by a processor or a processor-related circuit component (or referred to as a processing circuit); the transceiver module 702 may be implemented by a transceiver or a transceiver-related circuit component.

For example, the processing module 701 may be configured to perform all operations except the transceiving operations performed by the terminal device in the embodiments shown in FIGS. 3-6, and/or other processes used to support the techniques described herein; Transceiver module 702 may be used to perform all of the transceive operations performed by the terminal device in the embodiments shown in FIGS. 3-6, and/or to support other processes of the techniques described herein.

Wherein, the processing module 701 is used to measure the TRSs sent by multiple TRPs respectively, and determine the uplink transmission frequency according to the reference TRP; wherein, different TRPs correspond to different TRSs; the reference TRP is one of the multiple TRPs;

The transceiver module 702 is used for sending an uplink signal at the uplink transmission frequency, and receiving a frequency adjustment FA command from the reference TRP; wherein, the FA command is used to indicate a frequency adjustment parameter; the frequency adjustment parameter is determined according to the uplink signal;

The processing module 701 is further configured to adjust the uplink transmission frequency according to the FA command.

In a possible design, the transceiver module 702 is further configured to receive the first identification information indicating the reference TRP from the radio access network device.

In a possible design, the processing module 701 is further configured to measure the downlink reference signals respectively sent by the multiple TRPs; and determine the reference TRP according to the measurement results of the multiple downlink reference signals.

In a possible design, the processing module 701 is specifically configured to determine the TRP corresponding to the downlink reference signal with the strongest signal strength as the reference TRP according to the signal strengths of multiple downlink reference signals.

In a possible design, the processing module 701 is specifically configured to determine the TRP corresponding to the downlink reference signal with the largest Doppler frequency shift as the reference TRP according to the Doppler frequency shifts of multiple downlink reference signals.

In a possible design, the transceiver module 702 is further configured to send second identification information for indicating the reference TRP corresponding to the terminal device.

As another implementation manner, the processing module 701 in FIG. 7 can be replaced by a processor, which can integrate the functions of the processing module 701; the transceiver module 702 can be replaced by a processor, and the processor can integrate the functions of the transceiver module 702. Function. Further, the terminal device 70 shown in FIG. 7 may further include a memory. When the processing module 701 is replaced by a processor and the transceiver module 702 is replaced by a transceiver, the terminal device 70 involved in this embodiment of the present application may be the communication device shown in FIG. 2 .

In the case where each functional module is divided corresponding to each function, FIG. 8 shows a wireless access network device, and the wireless access network device 80 may include a transceiver module 801 and a processing module 802 . Exemplarily, the radio access network device 80 may be a radio access network device, a chip applied in the radio access network device, or other combined devices, components, etc. having the functions of the above radio access network device. When the wireless access network device 80 is a wireless access network device, the transceiver module 801 may be a transceiver, and the transceiver may include an antenna and a radio frequency circuit; the processing module 802 may be a processor (or a processing circuit), such as a baseband processing The baseband processor may include one or more CPUs. When the radio access network device 80 is a component having the functions of the above radio access network device, the transceiver module 801 may be a radio frequency unit; the processing module 802 may be a processor (or a processing circuit), such as a baseband processor. When the wireless access network device 80 is a chip system, the transceiver module 801 may be an input and output interface of a chip (eg, a baseband chip); the processing module 802 may be a processor (or a processing circuit) of the chip system, which may include one or more a central processing unit. It should be understood that the transceiver module 801 in this embodiment of the present application may be implemented by a transceiver or a transceiver-related circuit component; the processing module 802 may be implemented by a processor or a processor-related circuit component (or referred to as a processing circuit).

For example, the transceiving module 801 may be used to perform all transceiving operations performed by the radio access network device in the embodiments shown in FIGS. 3-6 , and/or other processes used to support the techniques described herein; processing module 802 may be used to perform all of the operations performed by the radio access network device in the embodiments shown in FIGS. 3-6 , except for transceiving operations, and/or other processes for supporting the techniques described herein.

Wherein, the transceiver module 801 is used to send TRS to terminal equipment respectively through multiple TRPs, and receive uplink signals from terminal equipment; wherein, different TRPs correspond to different TRSs; the uplink transmission frequency of uplink signals is determined according to the reference TRP; TRP is one of multiple TRPs;

a processing module 802, configured to determine a frequency adjustment parameter according to the uplink signal;

The transceiver module 801 is further configured to send a frequency adjustment FA command to the terminal device by referring to the TRP, wherein the FA command is used to indicate a frequency adjustment parameter.

In a possible design, the transceiver module 801 is further configured to send the first identification information for indicating the reference TRP to the terminal device.

In a possible design, the transceiver module 801 is further configured to receive second identification information from the terminal device for indicating the reference TRP corresponding to the terminal device.

As another implementation manner, the transceiver module 801 in FIG. 8 can be replaced by a transceiver, which can integrate the functions of the transceiver module 801; the processing module 802 can be replaced by a processor, which can integrate the functions of the processing module 802. Function. Further, the radio access network device 80 shown in FIG. 8 may further include a memory. When the transceiver module 801 is replaced by a transceiver and the processing module 802 is replaced by a processor, the radio access network device 80 involved in the embodiment of the present application may be the communication device shown in FIG. 2 .

Embodiments of the present application also provide a computer-readable storage medium. All or part of the processes in the above method embodiments can be completed by instructing the relevant hardware by a computer program, the program can be stored in the above computer-readable storage medium, and when the program is executed, it can include the processes in the above method embodiments. . The computer-readable storage medium may be an internal storage unit of the terminal (including the data sending end and/or the data receiving end) in any of the foregoing embodiments, such as a hard disk or a memory of the terminal. The above-mentioned computer-readable storage medium can also be an external storage device of the above-mentioned terminal, such as a plug-in hard disk equipped on the above-mentioned terminal, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, flash memory card (flash card) etc. Further, the above-mentioned computer-readable storage medium may also include both an internal storage unit of the above-mentioned terminal and an external storage device. The above-mentioned computer-readable storage medium is used for storing the above-mentioned computer program and other programs and data required by the above-mentioned terminal. The above-mentioned computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

It should be noted that the terms "first" and "second" in the description, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

It should be understood that in this application, "at least one (item)" refers to one or more, "multiple" refers to two or more, and "at least two (item)" refers to two or three And three or more, "and/or" is used to describe the association relationship of related objects, indicating that three kinds of relationships can exist, for example, "A and/or B" can mean: only A exists, only B exists, and A exists at the same time and B three cases, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b or c, can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c" ", where a, b, c can be single or multiple.

From the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be allocated as required. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be Incorporation may either be integrated into another device, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

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

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

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, which are stored in a storage medium , including several instructions to make a device (may be a single chip microcomputer, a chip, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk and other mediums that can store program codes.

Claims

A transmission frequency adjustment method, comprising:

The terminal device measures the tracking reference signals TRS respectively sent by the multiple transmission and reception points TRP; wherein, different TRPs correspond to different TRSs;

The terminal device determines the uplink transmission frequency according to the reference TRP; wherein, the reference TRP is one of the multiple TRPs;

sending, by the terminal device, an uplink signal at the uplink sending frequency;

The terminal device receives a frequency adjustment FA command from the reference TRP; wherein, the FA command is used to indicate a frequency adjustment parameter; the frequency adjustment parameter is determined according to the uplink signal;

The terminal device adjusts the uplink transmission frequency according to the FA command.
The method according to claim 1, wherein the method further comprises:

The terminal device receives first identification information from a radio access network device; wherein, the first identification information is used to indicate the reference TRP.
The method according to claim 1, wherein the method further comprises:

The terminal device measures the downlink reference signals respectively sent by the multiple TRPs;

The terminal device determines the reference TRP according to a plurality of measurement results of the downlink reference signals.
The method of claim 3, wherein:

The measurement result of the downlink reference signal includes one or more of the following: signal strength and Doppler frequency shift.
The method according to claim 4, wherein the terminal device determines the reference TRP according to the measurement results of multiple downlink reference signals, comprising:

The terminal device determines, according to the signal strengths of a plurality of the downlink reference signals, the TRP corresponding to the downlink reference signal with the strongest signal strength as the reference TRP.
The method according to claim 4, wherein the terminal device determines the reference TRP according to the measurement results of multiple downlink reference signals, comprising:

The terminal device determines, according to the Doppler frequency shifts of the multiple downlink reference signals, the TRP corresponding to the downlink reference signal with the largest Doppler frequency shift as the reference TRP.
The method according to any one of claims 3-6, wherein the method further comprises:

The terminal device sends second identification information, wherein the second identification information is used to indicate the reference TRP corresponding to the terminal device.
The method according to any one of claims 1-7, wherein,

the frequency adjustment parameter includes a pre-compensation coefficient; or

The frequency adjustment parameter includes an index of a pre-compensation coefficient; wherein the pre-compensation coefficient is one of a preset pre-compensation coefficient value set; or

The frequency adjustment parameter includes a frequency adjustment value.
A transmission frequency adjustment method, comprising:

The wireless access network equipment sends the tracking reference signal TRS to the terminal equipment through the multiple transmission and reception points TRP respectively; wherein, different TRPs correspond to different TRSs;

The radio access network device receives an uplink signal from the terminal device; wherein, the uplink transmission frequency of the uplink signal is determined according to a reference TRP; the reference TRP is one of the multiple TRPs;

The wireless access network device determines a frequency adjustment parameter according to the uplink signal;

The wireless access network device sends a frequency adjustment FA command to the terminal device through the reference TRP, wherein the FA command is used to indicate the frequency adjustment parameter.
The method according to claim 9, wherein the method further comprises:

The radio access network device sends first identification information to the terminal device, wherein the first identification information is used to indicate the reference TRP.
The method according to claim 9, wherein the method further comprises:

The radio access network device receives second identification information from the terminal device; wherein the second identification information is used to indicate the reference TRP corresponding to the terminal device.
The method according to any one of claims 9-11, wherein,

the frequency adjustment parameter includes a pre-compensation coefficient; or

The frequency adjustment parameter includes an index of a pre-compensation coefficient; wherein the pre-compensation coefficient is one of a preset pre-compensation coefficient value set; or

The frequency adjustment parameter includes a frequency adjustment value.
A terminal device, characterized in that it includes:

a processing module, configured to measure the tracking reference signals TRS respectively sent by the multiple transmission and reception points TRP; wherein, different TRPs correspond to different TRSs;

The processing module is further configured to determine an uplink transmission frequency according to a reference TRP; wherein the reference TRP is one of the multiple TRPs;

a transceiver module, communicatively coupled with the processing module, for sending an uplink signal at the uplink sending frequency;

The transceiver module is further configured to receive a frequency adjustment FA command from the reference TRP; wherein the FA command is used to indicate a frequency adjustment parameter; the frequency adjustment parameter is determined according to the uplink signal;

The processing module is further configured to adjust the uplink transmission frequency according to the FA command.
The terminal device according to claim 13, wherein,

The transceiver module is further configured to receive first identification information from a wireless access network device; wherein the first identification information is used to indicate the reference TRP.
The terminal device according to claim 13, wherein,

The processing module is further configured to measure downlink reference signals sent respectively by the multiple TRPs;

The processing module is further configured to determine the reference TRP according to a plurality of measurement results of the downlink reference signals.
The terminal device according to claim 15, wherein,

The measurement result of the downlink reference signal includes one or more of the following: signal strength and Doppler frequency shift.
The terminal device according to claim 16, wherein,

The processing module is specifically configured to determine the TRP corresponding to the downlink reference signal with the strongest signal strength as the reference TRP according to the signal strengths of a plurality of the downlink reference signals.
The terminal device according to claim 16, wherein,

The processing module is specifically configured to determine the TRP corresponding to the downlink reference signal with the largest Doppler frequency shift as the reference TRP according to the Doppler frequency shifts of the plurality of downlink reference signals.
The terminal device according to any one of claims 15-18, wherein,

The transceiver module is further configured to send second identification information; wherein, the second identification information is used to indicate the reference TRP corresponding to the terminal device.
The terminal device according to any one of claims 13-19, wherein,

the frequency adjustment parameter includes a pre-compensation coefficient; or

The frequency adjustment parameter includes an index of a pre-compensation coefficient; wherein the pre-compensation coefficient is one of a preset pre-compensation coefficient value set; or

The frequency adjustment parameter includes a frequency adjustment value.
A wireless access network device, comprising:

a transceiver module, configured to send a tracking reference signal TRS to the terminal device through a plurality of transmission and reception points TRP respectively; wherein, different TRPs correspond to different TRSs;

The transceiver module is further configured to receive an uplink signal from the terminal device; wherein, the uplink transmission frequency of the uplink signal is determined according to a reference TRP; the reference TRP is one of the multiple TRPs;

a processing module, communicatively coupled with the transceiver module, for determining a frequency adjustment parameter according to the uplink signal;

The transceiver module is further configured to send a frequency adjustment FA command to the terminal device through the reference TRP, wherein the FA command is used to indicate the frequency adjustment parameter.
The wireless access network device according to claim 21, wherein:

The transceiver module is further configured to send first identification information to the terminal device, wherein the first identification information is used to indicate the reference TRP.
The wireless access network device according to claim 21, wherein:

The transceiver module is further configured to receive second identification information from the terminal device; wherein the second identification information is used to indicate the reference TRP corresponding to the terminal device.
The wireless access network device according to any one of claims 21-23, wherein,

the frequency adjustment parameter includes a pre-compensation coefficient; or

The frequency adjustment parameter includes an index of a pre-compensation coefficient; wherein the pre-compensation coefficient is one of a preset pre-compensation coefficient value set; or

The frequency adjustment parameter includes a frequency adjustment value.
A communication device, characterized in that the communication device comprises a processor; the processor is configured to run a computer program or an instruction, so that the communication device performs the sending according to any one of claims 1-8 frequency adjustment method, or implement the transmission frequency adjustment method according to any one of claims 9-12.
A communication device, characterized in that, the communication device comprises a processor and a communication interface; the communication interface is coupled to the processor, and the processor is used for running a computer program or instruction to implement the methods of claims 1-8 According to any one of the transmission frequency adjustment methods, or to execute the transmission frequency adjustment method according to any one of claims 9-12, the communication interface is used to communicate with other modules other than the communication device.
A communication device, characterized in that, the communication device includes an interface circuit and a logic circuit; the interface circuit is used to obtain input information and/or output information; the logic circuit is used to perform any one of claims 1-8. One of the method for adjusting the transmission frequency, or executing the method for adjusting the transmission frequency according to any one of claims 9-12, processing and/or generating the output information according to the input information.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions or programs, and when the computer instructions or programs are run on a computer, the computer is made to execute the method described in any one of claims 1-8. The transmission frequency adjustment method, or the transmission frequency adjustment method according to any one of claims 9-12 is performed.
A computer program product, characterized in that the computer program product includes computer instructions; when part or all of the computer instructions are run on a computer, the computer is made to execute the sending frequency according to any one of claims 1-8 adjustment method, or implement the transmission frequency adjustment method according to any one of claims 9-12.