Signal transmission method, terminal, network device, and storage medium

Abstract

[0009] The present application provides a signal transmission method, a terminal, a network device, and a storage medium. The method includes receiving a plurality of first downlink signals, determining a downlink receiving frequency corresponding to each of the first downlink signals, and determining a transmission frequency of each uplink signal having a correlation with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals, and transmitting each of the uplink signals based on the transmission frequency of each uplink signal, wherein the frequency shift determined based on the uplink signal having the correlation with the first downlink signal is used to determine the transmission frequency of a second downlink signal. In the present application, each transmitting and receiving point pre-compensates for downlink Doppler shift, thereby reducing channel estimation error and improving downlink transmission performance.

Description

[Technical Field]

[0001] [Cross reference] This application claims priority to a Chinese patent application filed on March 5, 2020, bearing application number 2020101486671 and entitled "Signal transmission method, terminal, network device, and storage medium," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of wireless communication, and in particular to a signal transmission method, a terminal, a network device, and a storage medium. [Background technology]

[0003] Multipoint coordination is an important technical measure in wireless communication systems. Distributed transmission through multiple distributed transmitting / receiving points can improve cell edge coverage and reduce handover-induced delays and signaling overhead. For example, in high-speed train scenarios, a single-frequency network (SFN) deployment method is typically adopted to avoid frequent cell handovers by user equipment (UE). This is called a high-speed train-single-frequency network (HST-SFN) scenario. In HST-SFN scenarios, a cell contains multiple transmitting / receiving points (e.g., remote radio heads (RRHs)), and signals are transmitted simultaneously from multiple transmitting / receiving points. When a train travels between two adjacent transmitting / receiving points, one of the signals from the two RRHs has a negative Doppler shift and the other has a positive Doppler shift, generating a Doppler spectrum. Due to the high speed of train movement, the range of variation of the Doppler shift may be very large, which may result in the terminal being unable to successfully demodulate the downlink signal.

[0004] To solve the problem of signals received by a terminal from different remote radio heads having opposite Doppler shifts, one method is to pre-compensate for the Doppler shift at each remote radio head, thereby eliminating the Doppler spread of the downlink signal received by the UE. However, in the case of multi-point transmission in the prior art, the UE determines only one downlink frequency point and transmits the uplink signal based on the downlink frequency point. Because the geographical locations and / or receiving beam directions of each remote radio head are different, the uplink signal experiences different Doppler shifts before reaching each remote radio head. Because the remote radio head does not know which downlink frequency point the UE is based on to transmit the uplink signal, the remote radio head cannot estimate the Doppler shift experienced by the downlink signal or the uplink signal, and as a result, it cannot effectively pre-compensate for the Doppler shift. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present application provide a signal transmission method, a terminal, a network device, and a storage medium to address the problems existing in the prior art. [Means for solving the problem]

[0006] In a first aspect, an embodiment of the present application provides a method for transmitting a signal, the method comprising: receiving a plurality of first downlink signals; Determining a downlink receiving frequency corresponding to each of the first downlink signals, and determining a transmission frequency of each uplink signal having a correlation with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals; transmitting each uplink signal based on a transmission frequency of the respective uplink signal; Here, the frequency shift determined based on the uplink signal having the association relationship with the first downlink signal is for determining the transmission frequency of the second downlink signal.

[0007] Optionally, the association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the first downlink signal; The receiving terminal of the uplink signal and the transmitting terminal of the first downlink signal are the same network device.

[0008] Optionally, the association relation is a QCL relation, and the type of the association relation is: Type 1: {Doppler shift, Doppler spread, average delay, delay spread}, Type 2: {Doppler shift, Doppler spread}, Type 3: {Doppler shift, average delay}, Type 4: {Spatial parameter} or {Spatial relation information SpatialRelationInofo}, Type 5: {Doppler shift}, Type 6: Contains one or more types of frequency-related information.

[0009] Optionally, the association is indicated by configuration or trigger information of the uplink signal.

[0010] As an option, the configuration information or trigger information of the uplink signal includes information of a plurality of first downlink signals having the association relationship with the uplink signal, and correspondingly, the method further includes: determining the first downlink signals having the association relationship with the uplink signal based on an activation signal sent from a network side; or each of the association relationships is associated with a trigger state, and when the uplink signal is triggered, determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the uplink signal further includes identification information, which is for indicating a position of a resource corresponding to the first downlink signal in a resource set in which the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal.

[0011] As an option, the configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information for indicating that they have the association relationship; or The configuration information or trigger information of the first downlink signal includes identification information, and all uplink signals correspond to the same resource set, and each uplink signal for the resource set has a one-to-one correspondence with the identification information; or The first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources included in the different resource sets and the first downlink resources have a predefined one-to-one correspondence.

[0012] Optionally, the association relationship is indicated by configuration information or trigger information of the first downlink signal.

[0013] As an option, the configuration information of the first downlink signal includes information of a plurality of uplink signals having the association relationship with the first downlink signal, and correspondingly, the method further includes: determining the uplink signal having the association relationship with the first downlink signal based on an activation signal sent from a network side; or each of the association relationships is associated with a trigger state, and when the first downlink signal is triggered, determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the first downlink signal further includes identification information, which is for indicating a position of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

[0014] As an option, the step of transmitting each uplink signal based on a transmission frequency of each uplink signal may include: each said uplink signal being assigned to a different time domain resource; each of the uplink signals is allocated to a different frequency domain resource with a guard interval therebetween; and Each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

[0015] Optionally, the uplink signal includes, but is not limited to, one or more of an SRS, a RACH, a PUSCH, a PUCCH, a DMRS corresponding to a PUSCH, and a DMRS corresponding to a PUCCH.

[0016] Optionally, the first downlink signal includes, but is not limited to, one or more of SSB, TRS, and NZP-CSI RS.

[0017] Optionally, the first downlink signal is determined based on one or more of the following: network side indication information, configuration information of the downlink signal, and a type of the downlink signal.

[0018] In a second aspect, an embodiment of the present application provides another signal transmission method, the signal transmission method comprising: Transmitting a first downlink signal to a terminal, and determining, by the terminal, a transmission frequency of an uplink signal having a correlation with the first downlink signal based on a downlink reception frequency corresponding to the first downlink signal; receiving an uplink signal transmitted by the terminal based on the transmission frequency and having the association relationship with the first downlink signal; determining a frequency shift based on the uplink signal to determine a transmission frequency of a second downlink signal;

[0019] Optionally, the step of determining a frequency shift based on the uplink signal and determining a transmission frequency of the second downlink signal may include: determining a frequency adjustment value for a second downlink signal based on the frequency shift; and determining a transmission frequency of a second downlink signal using the frequency adjustment value.

[0020] Optionally, the association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the downlink signal; The receiving terminal of the uplink signal and the transmitting terminal of the downlink signal are the same network device.

[0021] Optionally, the association relation is a QCL relation, and the type of the association relation is: Type 1: {Doppler shift, Doppler spread, average delay, delay spread}, Type 2: {Doppler shift, Doppler spread}, Type 3: {Doppler shift, average delay}, Type 4: {Spatial parameter} or {Spatial relation information SpatialRelationInofo}, Type 5: {Doppler shift}, Type 6: Contains one or more types of frequency-related information.

[0022] Optionally, the association is indicated by configuration or trigger information of the uplink signal.

[0023] As an option, The configuration information of the uplink signal includes information of a plurality of the first downlink signals having the association relationship with the uplink signal, and correspondingly, the method further includes a network side sending an activation signal, and the terminal determining the first downlink signals having the association relationship with the uplink signal; or each of the association relationships is associated with one or more trigger states, and a network side sending a trigger signal to trigger the uplink signal, and the terminal determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the uplink signal further includes identification information, which is for indicating a position of a resource corresponding to the first downlink signal in a resource set in which the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal.

[0024] As an option, the configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information for indicating that they have the association relationship; or The configuration information or trigger information of the first downlink signal includes identification information, and all uplink signals correspond to the same resource set, and each uplink signal for the resource set has a one-to-one correspondence with the identification information; or The first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources included in the resource sets and the first downlink resources have a predefined one-to-one correspondence.

[0025] Optionally, the association relationship is indicated by configuration information or trigger information of the first downlink signal.

[0026] As an option, The configuration information of the first downlink signal further includes information of a plurality of uplink signals having the association relationship with the first downlink signal, and correspondingly, the method further includes: a network side sending an activation signal, and the terminal determining the uplink signal having the association relationship with the first downlink signal; or each of the association relationships is associated with a trigger state, and a network side sending a trigger signal to trigger the first downlink signal, and the terminal determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the first downlink signal further includes identification information, which is for indicating a position of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

[0027] Optionally, the transmission scheme of each said uplink signal comprises: each said uplink signal being assigned to a different time domain resource; each of the uplink signals is allocated to a different frequency domain resource with a guard interval therebetween; and Each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

[0028] Optionally, the uplink signal includes, but is not limited to, one or more of an SRS, a RACH, a PUSCH, a PUCCH, a DMRS corresponding to a PUSCH, and a DMRS corresponding to a PUCCH.

[0029] Optionally, the downlink signals include, but are not limited to, one or more of SSB, TRS, and NZP-CSI RS.

[0030] Optionally, the network side instructs the terminal to use the first downlink signal based on one or more of network side instruction information, configuration information of the downlink signal, and a type of the downlink signal.

[0031] In a third aspect, an embodiment of the present application provides a terminal, the terminal comprising: a first receiving module for receiving a plurality of first downlink signals; a first determining module for determining a downlink receiving frequency corresponding to each of the first downlink signals, and for respectively determining a transmission frequency of each uplink signal having a correlation with each of the first downlink signals according to the downlink receiving frequency corresponding to each of the first downlink signals; a first transmitting module for transmitting each uplink signal based on a transmission frequency of the each uplink signal; Here, the frequency shift determined based on the uplink signal having the association relationship with the first downlink signal is for determining the transmission frequency of the second downlink signal.

[0032] In a fourth aspect, an embodiment of the present application provides a terminal, the terminal including a memory, a processor, and a program stored in the memory and executable by the processor, the program, when executed by the processor, receiving a plurality of first downlink signals; Determining a downlink receiving frequency corresponding to each of the first downlink signals, and determining a transmission frequency of each uplink signal having a correlation with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals; transmitting each uplink signal based on a transmission frequency of the respective uplink signal; Here, the frequency shift determined based on the uplink signal having the association relationship with the first downlink signal is for determining the transmission frequency of the second downlink signal.

[0033] Optionally, the association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the first downlink signal; The receiving terminal of the uplink signal and the transmitting terminal of the first downlink signal are the same network device.

[0034] Optionally, the association relation is a QCL relation, and the type of the association relation is: Type 1: {Doppler shift, Doppler spread, average delay, delay spread}, Type 2: {Doppler shift, Doppler spread}, Type 3: {Doppler shift, average delay}, Type 4: {Spatial parameter} or {Spatial relation information SpatialRelationInofo}, Type 5: {Doppler shift}, Type 6: Contains one or more types of frequency-related information.

[0035] Optionally, the association is indicated by configuration or trigger information of the uplink signal.

[0036] As an option, the configuration information or trigger information of the uplink signal includes information of a plurality of first downlink signals having the association relationship with the uplink signal, and correspondingly, the method further includes: determining the first downlink signals having the association relationship with the uplink signal based on an activation signal sent from a network side; or each of the association relationships is associated with a trigger state, and when the uplink signal is triggered, determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the uplink signal further includes identification information, which is for indicating a position of a resource corresponding to the first downlink signal in a resource set in which the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal.

[0037] As an option, the configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information for indicating that they have an associated relationship; or The configuration information or trigger information of the first downlink signal includes identification information, and all uplink signals correspond to the same resource set, and each uplink signal for the resource set has a one-to-one correspondence with the identification information; or The first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources included in the different resource sets and the first downlink resources have a predefined one-to-one correspondence.

[0038] Optionally, the association relationship is indicated by configuration information or trigger information of the first downlink signal.

[0039] As an option, The configuration information of the first downlink signal includes information of a plurality of uplink signals having the association relationship with the first downlink signal, and correspondingly, the method further includes: determining the uplink signal having the association relationship with the first downlink signal based on an activation signal sent from a network side; or each of the association relationships is associated with a trigger state, and when the first downlink signal is triggered, determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the first downlink signal further includes identification information, which is for indicating a position of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

[0040] As an option, the step of transmitting each uplink signal based on a transmission frequency of each uplink signal may include: each said uplink signal being assigned to a different time domain resource; each of the uplink signals is allocated to a different frequency domain resource with a guard interval therebetween; and Each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

[0041] Optionally, the uplink signal includes, but is not limited to, one or more of an SRS, a RACH, a PUSCH, a PUCCH, a DMRS corresponding to a PUSCH, and a DMRS corresponding to a PUCCH.

[0042] Optionally, the first downlink signal includes, but is not limited to, one or more of SSB, TRS, and NZP-CSI RS.

[0043] Optionally, the first downlink signal is determined based on one or more of a network side indication information, a configuration information of the downlink signal, and a type of the downlink signal.

[0044] In a fifth aspect, an embodiment of the present application provides a network device, the network device comprising: a second transmitting module for transmitting a first downlink signal to a terminal, and for the terminal to determine a transmission frequency of an uplink signal having a correlation with the first downlink signal based on a downlink receiving frequency corresponding to the first downlink signal; a second receiving module for receiving an uplink signal transmitted by the terminal based on the transmission frequency, the uplink signal having the association relationship with the first downlink signal; and a second determining module for determining a frequency shift based on the uplink signal and determining a transmission frequency of a second downlink signal.

[0045] In a sixth aspect, an embodiment of the present application provides another network device, the network device including a memory, a processor, and a program stored in the memory and executable by the processor, the program, when executed by the processor, Transmitting a first downlink signal to a terminal, and determining, by the terminal, a transmission frequency of an uplink signal having a correlation with the first downlink signal based on a downlink reception frequency corresponding to the first downlink signal; receiving an uplink signal transmitted by the terminal based on the transmission frequency and having the association relationship with the first downlink signal; determining a frequency shift based on the uplink signal to determine a transmission frequency of a second downlink signal is realized.

[0046] Optionally, the step of determining a frequency shift based on the uplink signal and determining a transmission frequency of the second downlink signal may include: determining a frequency adjustment value for a second downlink signal based on the frequency shift; Using the frequency adjustment value to determine a transmission frequency of a second downlink signal.

[0047] Optionally, the association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the downlink signal; The receiving terminal of the uplink signal and the transmitting terminal of the downlink signal are the same network device.

[0048] Optionally, the association relation is a QCL relation, and the type of the association relation is: Type 1: {Doppler shift, Doppler spread, average delay, delay spread}, Type 2: {Doppler shift, Doppler spread}, Type 3: {Doppler shift, average delay}, Type 4: {Spatial parameter} or {Spatial relation information SpatialRelationInofo}, Type 5: {Doppler shift}, Type 6: Contains one or more types of frequency-related information.

[0049] Optionally, the association is indicated by configuration or trigger information of the uplink signal.

[0050] As an option, The configuration information of the uplink signal includes information of a plurality of the first downlink signals having the association relationship with the uplink signal, and correspondingly, the method further includes a network side sending an activation signal, and the terminal determining the first downlink signals having the association relationship with the uplink signal; or each of the association relationships is associated with one or more trigger states, and a network side sending a trigger signal to trigger the uplink signal, and the terminal determining the association relationship based on the trigger state; or The configuration information or trigger information of the uplink signal further includes identification information, which is for indicating a position of a resource corresponding to the first downlink signal in a resource set in which the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal.

[0051] As an option, the configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information for indicating that they have an associated relationship; or The configuration information or trigger information of the first downlink signal includes identification information, and all uplink signals correspond to the same resource set, and each uplink signal for the resource set has a one-to-one correspondence with the identification information; or The first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources included in the resource sets and the first downlink resources have a predefined one-to-one correspondence.

[0052] Optionally, the association relationship is indicated by configuration information or trigger information of the first downlink signal.

[0053] As an option, The configuration information of the first downlink signal further includes information of a plurality of uplink signals having the association relationship with the first downlink signal, and correspondingly, the method further includes: a network side sending an activation signal, and the terminal determining the uplink signal having the association relationship with the first downlink signal; or each of the association relationships is associated with a trigger state, and a network side sending a trigger signal to trigger the first downlink signal, and the terminal determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the first downlink signal further includes identification information, which is for indicating a position of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

[0054] Optionally, each said uplink signal comprises: each said uplink signal being assigned to a different time domain resource; each of the uplink signals is allocated to a different frequency domain resource with a guard interval therebetween; and Each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

[0055] Optionally, the uplink signal includes, but is not limited to, one or more of an SRS, a RACH, a PUSCH, a PUCCH, a DMRS corresponding to a PUSCH, and a DMRS corresponding to a PUCCH.

[0056] Optionally, the downlink signals include, but are not limited to, one or more of SSB, TRS, and NZP-CSI RS.

[0057] Optionally, instruct the terminal to determine whether a downlink signal is the first downlink signal based on one or more of: network side indication information, configuration information of the downlink signal, and a type of the downlink signal.

[0058] In a seventh aspect, an embodiment of the present application provides a non-transitory computer readable storage medium having stored thereon a computer program that, when executed by a processor, performs the steps of the method of the first aspect.

[0059] In an eighth aspect, embodiments of the present application provide a non-transitory computer-readable storage medium having stored thereon a computer program that, when executed by a processor, performs the steps of the method of the second aspect. [Effects of the Invention]

[0060] In the signal transmission method, terminal, network device, and storage medium according to the embodiments of the present application, the terminal determines a corresponding downlink receiving frequency for each received first downlink signal, and determines a transmission frequency for each uplink signal based on the downlink receiving frequency, where each first downlink signal and each uplink signal have a predetermined correlation, and each transmitting / receiving point can independently perform shift estimation and pre-compensation, and each transmitting / receiving point has pre-compensated for downlink Doppler shift, thereby reducing channel estimation error and improving downlink transmission performance.

[0061] In order to more clearly describe the embodiments of the present application or the technical solutions in the prior art, the drawings necessary for describing the embodiments or the prior art will be briefly described below. Of course, the drawings described below are only some embodiments of the present application, and those skilled in the art can further derive other drawings based on these drawings without any creative work. [Brief explanation of the drawings]

[0062] [Figure 1] 1 is a schematic flowchart of a signal transmission method according to an embodiment of the present invention. [Figure 2] 4 is a schematic flowchart of a signal transmission method according to another embodiment of the present application; [Figure 3] FIG. 2 is a schematic diagram illustrating the configuration of a terminal according to an embodiment of the present invention. [Figure 4] FIG. 10 is a schematic diagram of the structure of a terminal according to another embodiment of the present application; [Figure 5] FIG. 10 is a schematic diagram of the structure of a terminal according to yet another embodiment of the present application; [Figure 6] 1 is a schematic diagram illustrating a configuration of a network device according to an embodiment of the present invention. [Figure 7] FIG. 10 is a schematic diagram of a configuration of a network device according to another embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0063] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings of the embodiments of the present application. Of course, the described embodiments are not all embodiments, but only some embodiments of the embodiments of the present application. All other embodiments obtained by those skilled in the art without creative work based on the embodiments of the present application are included in the protection scope of the present application.

[0064] In an HST-SFN scenario, multiple transmission and reception points (TRPs) (which may be several RRHs) are connected to the same base band unit (BBU) via optical fiber, and these multiple TRPs use the same cell ID. Connecting multiple TRPs expands the cell coverage and reduces the cell switching frequency of terminals. Because the TRPs are connected to the BBU via optical fiber, the space between these TRPs can be considered an ideal backhaul. A common transmission method in an HST-SFN scenario is for all TRPs connected to a single BBU to simultaneously transmit downlink signals. That is, all TRPs transmit the same codeword, layer, and DMRS (Demodulation Reference Signal) port. Multiple TRPs are equivalent to forming more paths. When a train travels between two adjacent TRPs, one of the signals from the two TRPs has a negative Doppler shift and the other has a positive Doppler shift, creating a Doppler spectrum. Due to the high speed of train movement, the range of variation of the Doppler shift may be very large, which may result in the terminal being unable to successfully demodulate the downlink signal.

[0065] To solve the problem that signals received by a terminal from different TRPs have opposite Doppler shifts, one method is to pre-compensate for the Doppler shift at each TRP, thereby eliminating the Doppler spread of the downlink signal received by the UE. However, in the prior art, the UE detects an SSB (Synchronization Signal Block, sometimes referred to as an SS / PBCH block or Synchronization Signal / Physical Broadcast Channel Block), obtains a downlink frequency point based on the detected SSB, and obtains an uplink frequency point based on the downlink frequency point, and transmits the uplink signal at the uplink frequency point. When the UE is moving, the downlink frequency point obtained by the UE includes the downlink Doppler shift. During uplink transmission, the uplink Doppler shift is further superimposed. Therefore, during single-point transmission, the frequency of the uplink signal when receiving the TRP has a Doppler shift that is twice that of the uplink frequency point at the TRP. During multi-point transmission, the downlink frequency point of each TRP is the same, but the Doppler shift at the UE is different due to different geographical locations. However, the UE determines only one downlink frequency point and transmits an uplink signal based on the downlink frequency point. Because the geographical location and / or receiving beam direction of each TRP are different, the Doppler shift experienced by the uplink signal until it reaches each TRP is different. Because the TRP does not know which downlink frequency point the UE uses to transmit the uplink signal, the TRP cannot estimate the Doppler shift experienced by the downlink signal or the uplink signal, and as a result, Doppler shift pre-compensation cannot be performed effectively.

[0066] In order to solve the problem of degradation in demodulation performance caused by the presence of opposite-direction Dopplers in signals received by a terminal when data is simultaneously transmitted from multiple transmission / reception points in a high-speed railway SFN deployment scenario, the embodiments of the present application provide a multi-transmission / reception point signal transmission solution based on frequency pre-compensation, that is, the terminal determines the transmission frequency (frequency point) of the uplink signal transmitted to each transmission / reception point TRP based on the downlink signal transmitted by each transmission / reception point TRP, and transmits each uplink signal using the transmission frequency, so that each transmission / reception point can respectively obtain the Doppler shift of the terminal relative to itself, thereby performing frequency pre-compensation at each transmission / reception point, and eliminating the Doppler shift and Doppler spread at the terminal side. Systems to which the methods of the embodiments of the present application can be applied include, but are not limited to, 5G systems (e.g., New Radio (NR) systems), LTE systems, 6G systems, satellite systems, vehicle Internet systems, and their evolved versions.

[0067] In the embodiments of the present application, the network device may be a base station, and the base station may include multiple transmission / reception points (TRPs) or TRP groups. For each TRP, the TRP may transmit a first downlink signal, the UE may transmit an associated uplink signal, and the base station may determine a pre-compensation frequency for the TRP. For each TRP group, one TRP may transmit a first downlink signal, the UE may transmit an associated uplink signal, and the base station may determine a pre-compensation frequency for all TRPs in the TRP group. Here, the TRP may be an RRH, and the TRP group may be an RRH group.

[0068] The network side equipment according to the embodiments of the present application may include, but is not limited to, one or more of equipment such as a commonly used base station, an evolved node base station (eNB), a network side equipment in a 5G system (e.g., a next generation node base station (gNB), a transmission and reception point (TRP)), etc.

[0069] A terminal according to an embodiment of the present application may be referred to as user equipment (UE), etc. The terminal may include, but is not limited to, a handheld device, an in-vehicle device, etc. For example, the terminal may be a mobile phone, a tablet computer, a laptop computer, an Ultra-Mobile Personal Computer (UMPC), a netbook, or a Personal Digital Assistant (PDA), etc.

[0070] FIG. 1 is a schematic flowchart of a signal transmission method according to one embodiment of the present application. As shown in FIG. 1, the execution body of the method may be a terminal (e.g., a user equipment UE), and the method includes at least steps 100 to 102.

[0071] Step 100: Receive a plurality of first downlink signals.

[0072] In an HST-SFN scenario, a UE receives first downlink signals respectively delivered by a plurality of transmission / reception points (TRPs), i.e., for example, an HST-SFN scenario includes a plurality of transmission / reception points (TRPs), each of which transmits its own first downlink signal to a UE in the HST-SFN scenario. Furthermore, to avoid the problem in the prior art that each TRP cannot estimate the Doppler shift experienced by the downlink signal or the uplink signal, and therefore cannot effectively perform Doppler shift pre-compensation, in the method according to the present embodiment, each of the first downlink signals delivered to the UE by each TRP has a relationship with an uplink signal, and the UE transmits the uplink signal based on the relationship.

[0073] Step 101: Determine a downlink receiving frequency corresponding to each of the first downlink signals, and determine a transmission frequency of each uplink signal having an associated relationship with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals.

[0074] After receiving multiple first downlink signals, the UE can first determine a downlink receiving frequency corresponding to each first downlink signal. The downlink receiving frequency described in the embodiments of the present application may be the frequency at which the first downlink signal arrives at the UE or a downlink frequency point determined by the UE corresponding to the first downlink signal. However, due to factors such as device influence, inaccurate channel estimation, and algorithms, the downlink receiving frequency of the first downlink signal determined by the UE may deviate from the actual frequency at which the downlink signal arrives at the UE. A frequency point refers to a reference frequency, i.e., a frequency that can be used to determine the frequency location of a downlink radio frequency channel and / or SSB and / or other units. For example, the downlink frequency point may be a reference frequency for determining the frequency of one or more downlink transmissions, such as a downlink channel (e.g., PDSCH, PDCCH, etc.), SSB, downlink reference signal (e.g., downlink DMRS, CSI-RS, TRS), etc. For example, the uplink frequency point may be a reference frequency for determining the frequency of one or more uplink transmissions, such as an uplink channel (PUSCH, PUCCH, RACH, etc.), an uplink reference signal (e.g., SRS), etc.

[0075] Alternatively, the UE determines a downlink receiving frequency corresponding to each first downlink signal based on one or more of the first downlink signals, and the downlink receiving frequencies corresponding to all the first downlink signals are the same. As a possible method, the UE determines one downlink frequency point, and the frequency point is used as the downlink receiving frequency corresponding to each first downlink signal determined by the UE.

[0076] Alternatively, the UE determines a downlink receiving frequency corresponding to each first downlink signal based on each first downlink signal, and the downlink receiving frequencies corresponding to each first downlink signal may be the same or different. As one possible method, the UE determines one downlink frequency point for each first downlink signal, and these downlink frequency points are used as the downlink receiving frequencies corresponding to each first downlink signal.

[0077] The method by which the UE respectively determines the transmission frequency of each uplink signal having an associated relationship with each first downlink signal based on the downlink receiving frequency corresponding to each first downlink signal may include various methods.

[0078] Alternatively, the UE determines the transmission frequency of each uplink signal based on the same downlink reception frequency.

[0079] Alternatively, the UE determines a downlink frequency point, and then determines an uplink frequency point based on the downlink frequency point and the uplink-downlink frequency deviation. The UE determines a Doppler shift of each first downlink signal relative to the downlink frequency point based on the first downlink signal. When determining the transmission frequency of an uplink signal, the UE determines an actual frequency point of the uplink signal by adding the Doppler shift of the first downlink signal having the above-mentioned correlation relationship with the uplink signal to the uplink frequency point, and determines the transmission frequency of the uplink signal based on the actual frequency point.

[0080] As an option, the UE determines, based on each first downlink signal, a Doppler shift of the first downlink signal relative to a downlink frequency point, determines a downlink receiving frequency of the first downlink signal based on the Doppler shift corresponding to each first downlink signal and the downlink frequency point, and then determines a transmission frequency of each uplink signal based on the downlink receiving frequency of the first downlink signal and the uplink-downlink frequency deviation.

[0081] The uplink and downlink frequency offsets may be agreed upon in a protocol, configured by the network equipment via signaling, or determined based on frequency indication information for the uplink and / or downlink of the network equipment.

[0082] As an option, the UE determines a downlink receiving frequency based on each first downlink signal, and uses the downlink receiving frequency to determine the transmission frequency of the uplink signal corresponding to the first downlink signal.

[0083] Optionally, the transmission frequency of one uplink signal is determined based on the downlink reception frequency of the first downlink signal with which the above-mentioned relationship exists plus the uplink to downlink frequency offset.

[0084] Step 102: Transmit each uplink signal according to the transmission frequency of each uplink signal.

[0085] The UE can determine the transmission frequencies of uplink signals having a correlation with each first downlink signal, and then transmit corresponding uplink signals to each TRP based on the transmission frequencies, and use different transmission frequencies to transmit the uplink signals. Each TRP can receive an uplink signal having a correlation with a previously transmitted first downlink signal transmitted by the UE, determine a frequency shift based on the uplink signal to perform frequency pre-compensation, and transmit a subsequent second downlink signal to the UE based on the pre-compensated transmission frequency.

[0086] In an embodiment of the present application, the UE determines the transmission frequency (frequency point) of the uplink signal to be transmitted to each transmission / reception point based on the first downlink signal transmitted by each transmission / reception point, and transmits each uplink signal using the transmission frequency. In this way, each transmission / reception point can obtain the Doppler shift of the terminal relative to itself, thereby performing frequency pre-compensation at each transmission / reception point to eliminate the Doppler shift and Doppler spread on the terminal side.

[0087] In each embodiment of the present application, the terms "first downlink signal" and "second downlink signal" are used to distinguish between downlink signals transmitted twice to a UE by the same TRP. The first downlink signal may be a downlink signal initially transmitted to a UE. Based on the first downlink signal, the UE can determine an associated uplink signal and determine the transmission frequency to be used to transmit the uplink signal from the TRP. The second downlink signal is a downlink signal transmitted by the TRP after frequency pre-compensation, thereby reducing channel estimation errors and improving downlink transmission performance. However, the first downlink signal and the second downlink signal may be different signals or two transmissions of the same signal. For example, when a UE first transmits a TRS for transmitting an uplink signal described in the present application, the TRS is the first downlink signal, and when the frequency-precompensated TRS is retransmitted a second time, the TRS is the second downlink signal.

[0088] In the method according to the embodiment of the present application, the terminal determines a corresponding downlink receiving frequency for each received first downlink signal, and determines a transmission frequency for each uplink signal based on the downlink receiving frequency, where each first downlink signal has a predetermined relationship with each uplink signal, and each transmitting / receiving point can independently perform shift estimation and pre-compensation, and each transmitting / receiving point has pre-compensated for downlink Doppler shift, thereby reducing channel estimation error and improving downlink transmission performance.

[0089] In the above embodiment, the association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the first downlink signal; The receiving terminal of the uplink signal and the transmitting terminal of the first downlink signal are the same network equipment, that is, the receiving terminal of the uplink signal and the transmitting terminal of the first downlink signal are quasi co-located (QCL).

[0090] Based on the above association relationship between downlink and uplink signals, alternatively, some characteristics of the channel experienced by the target signal can be obtained from the source signal, or the spatial transmit parameters of the target signal can be obtained from the spatial receive parameters of the source signal.

[0091] The association relationship is a QCL relationship, and the type of the association relationship includes one or more of the following types:

[0092] Type 1 ('QCL-TypeA'): {Doppler shift, Doppler spread, average delay, delay spread}, Type 2 ('QCL-TypeB'): {Doppler shift, Doppler spread}, Type 3 ('QCL-TypeC'): {Doppler shift, average delay}, Type 4 (e.g., 'QCL-TypeE'): {Spatial parameter} or {Spatial related information SpatialRelationInofo} The spatial transmission parameters of the target signal can be obtained from the spatial reception parameters of the source signal, Type 5 (e.g., 'QCL-TypeF'): {Doppler shift}, Type 6: Frequency-related information (the transmission frequency of the target signal is determined based on the source signal); Type 7: A new QCL type that includes a Doppler shift.

[0093] Some possible association relationship types between uplink and downlink signals are shown in Table 1 below, and the association relationship may include one or more of the types in the following table, and if multiple types are included, it can be one of the combinations of Type 1 / 2 / 3 / 5 / 6+Type 4.

[0094] [Table 1]

[0095] As options, if Type 1 is included, the UE determines the Doppler shift, Doppler spread, mean delay, and delay spread of the uplink signal based on the first downlink signal. If Type 2 is included, the UE determines the Doppler shift and Doppler spread of the uplink signal based on the first downlink signal. If Type 3 is included, the UE determines the Doppler shift and mean delay of the uplink signal based on the first downlink signal. If Type 4 is included, the UE determines the transmit beam of the uplink signal based on the downlink signal. If Type 4 is included, the UE uses the receive spatial filter of the downlink signal as the transmit spatial filter of the uplink signal. If Type 5 is included, the UE determines the Doppler shift of the uplink signal based on the first downlink signal. If Type 6 is included, the UE determines the frequency-related information of the uplink signal based on the first downlink signal, and so on.

[0096] It can be understood that the association relationship may be indicated by other indication methods other than the QCL type method, and that as long as the function of the association relationship proposed in this application can be realized, it is included in the embodiments of this application.

[0097] As described in the above embodiment, the uplink signal optionally includes, but is not limited to, one or more of an SRS (Sounding Reference Signal), a RACH (Random Access Channel), a PUSCH (Physical Uplink Shared Channel), a PUCCH (Physical Uplink Control Channel), a DMRS corresponding to a PUSCH, and a DMRS corresponding to a PUCCH.

[0098] Optionally, the first downlink signal includes, but is not limited to, one or more of SSB, TRS (Tracking Reference Signal), and NZP-CSI RS (Non-zero power Channel state information reference signal).

[0099] Optionally, one or more of the following methods can be used to determine whether a downlink signal sent by the network side is the first downlink signal:

[0100] Indication information of the network side: For example, the network side may directly indicate which signal is the first downlink signal, that is, determine it based on the association relationship indicated by the network side.

[0101] The configuration information of the first downlink signal: For example, it may be directly indicated in the configuration parameters of the downlink signal.

[0102] The type of the downlink signal: for example, all SSBs are considered to be primary downlink signals, or all TRSs are considered to be primary downlink signals, or the protocol agrees that downlink signals using a particular sequence are primary downlink signals, or the protocol agrees that downlink signals with particular characteristics are primary downlink signals, etc.

[0103] Optionally, the uplink signal further determines a Doppler shift, a Doppler spread, a mean delay, a delay spread, a transmit beam, etc. of the uplink signal based on the first downlink signal.

[0104] The following embodiment describes how the network side configures or indicates the association relationship to the UE.

[0105] In one method, the network side indicates the association relationship to the UE through dedicated signaling. Alternatively, the signaling is during uplink configuration (e.g., uplink-config). The association relationship is indicated through TCI (Transmission Configuration Indicator) signaling. For example, TCI signaling is configured during uplink configuration.

[0106] Alternatively, the association relationship is included in configuration information or trigger information of the uplink signal, i.e., the network side is indicated by the configuration information or trigger information of the uplink signal, and the UE correspondingly determines the association relationship based on the configuration information or trigger information of the uplink signal. Alternatively, the configuration information of the uplink signal is transmitted via RRC (Radio Resource Control) signaling. Alternatively, the configuration information of the uplink signal is transmitted via MAC-CE (Media Access Control Unit) signaling. Alternatively, the trigger information of the uplink signal is indicated via DCI (Downlink Control Information) signaling.

[0107] Alternatively, the configuration information or trigger information of the uplink signal may include information on the first downlink signals having the association relationship with the uplink signal, i.e., there are multiple first downlink signals having an association relationship with the uplink signal under the instruction of the configuration information or trigger information of the uplink signal. For example, the configuration information of the uplink signal may include configuration information on multiple / multiple groups of TCI states, and the network side may also instruct the UE on the activated TCI states, and the UE may determine the association type and the first downlink signal associated with the uplink signal based on the activated TCI states. After receiving the first downlink signal activated by the activation signal sent by the network side, the UE may transmit the uplink signal to the network side. Furthermore, the configuration information or trigger information of the uplink signal may include information on the first downlink signals having the association relationship with the uplink signal, i.e., there are multiple first downlink signals having an association relationship with the uplink signal under the instruction of the configuration information or trigger information of the uplink signal. Each association relationship is associated with one trigger state, and when the uplink signal is triggered, the association relationship is determined based on the trigger state. The configuration information of the uplink signal includes configuration information of multiple / multiple groups of TCI-states, and the association relationship is associated with the trigger state and indicated via the TCI-state. When the uplink signal is triggered, the terminal can obtain the type of association relationship and first downlink signal information associated with the uplink signal based on the trigger state.

[0108] As an example, one TCI-state configuration is as follows: TCI-State::= SEQUENCE { tci-StateId TCI-StateId, qcl-Type1 QCL-Info, qcl-Type2 QCL-Info OPTIONAL, -- Need R ... } QCL-Info::= SEQUENCE { cell ServCellIndex OPTIONAL, --Need R bwp-Id BWP-Id OPTIONAL,--Cond CSI-RS-Indicated referenceSignal CHOICE{ csi-rs NZP-CSI-RS-ResourceId, ssb SSB-Index }, qcl-Type ENUMERATED{typeA,typeB,typeC,typeD}, ... } where tci-StateId represents a TCI-state identifier, qcl-Type1 and qcl-Type2 represent QCL types, and referenceSignal represents a first downlink signal associated with the uplink signal. Furthermore, the configuration information or trigger information of the uplink signal may further include identification information, which indicates a location of a resource corresponding to the first downlink signal in a resource set where the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal. Specifically, multiple first downlink signals correspond to the same resource set, and the network side carries one identification information through the configuration information or trigger information of the uplink signal, which identification information indicates whether a downlink signal corresponding to the resource set is used to associate with the uplink signal, and the UE determines the first downlink signal corresponding to the resource set based on the location indicated by the identification information.

[0109] Alternatively, the association between the uplink signal and the first downlink signal is implicitly indicated.

[0110] Alternatively, the configuration or trigger information of the uplink signal and the configuration or trigger information of the first downlink signal may include identification information to indicate that they have an associated relationship. For example, the configuration / trigger information of the uplink signal and the first downlink signal may include identification information, and if one uplink signal has the same identification information as the first downlink signal, these two signals have an associated relationship. Alternatively, the type of the associated relationship may be agreed upon in advance (e.g., specified by a protocol). Or, The configuration information or trigger information of the first downlink signal includes identification information, all uplink signals correspond to the same resource set, and each uplink signal for the resource set has a one-to-one correspondence with the identification information. Specifically, the configuration / trigger information of the first downlink signal includes specific identification information, all uplink signals corresponding to TRPs correspond to the same resource set, and the uplink signals corresponding to the resource set and the TRPs corresponding to the identification information have a one-to-one correspondence according to a predefined relationship. The corresponding uplink signal can be determined based on the identification information. Or, The first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources included in the different resource sets have a predefined one-to-one correspondence with the first downlink resources. Specifically, the first downlink signals all correspond to the same resource set type, and the uplink signals all correspond to the same resource set type, and the types of the uplink signals and the first downlink signals may be the same or different. There is a predefined one-to-one correspondence between the uplink resources and the downlink resources included in these resource set types. Based on the one-to-one correspondence, an association relationship between the uplink signal and the first downlink signal can be determined.

[0111] As another alternative, the association relationship is included in the configuration information or trigger information of the first downlink signal, i.e., the network side indicates it through the configuration information or trigger information of the first downlink signal, and the UE correspondingly determines the association relationship based on the configuration information or trigger information of the first downlink signal.

[0112] Alternatively, the configuration information of the first downlink signal includes information on multiple uplink signals having the association relationship with the first downlink signal, i.e., there are multiple uplink signals having the association relationship with the first downlink signal under the instruction of the configuration information or trigger information of the first downlink signal. Alternatively, the UE can directly determine the uplink signal associated with the first downlink signal based on the configuration information. The UE can further determine the uplink signal having the association relationship with the first downlink signal based on an activation signal sent from a network side, specifically, the network side also indicates activated configuration information to the UE, and the UE determines the type of association relationship and the uplink signal associated with the first downlink signal based on the activated configuration information.

[0113] Alternatively, the configuration information of the first downlink signal may include information on multiple uplink signals having the association relationship with the first downlink signal, i.e., multiple uplink signals may have an association relationship with the first downlink signal under the instruction of the configuration information or trigger information of the first downlink signal. Each of the association relationships is associated with a trigger state, and when the first downlink signal is triggered, the association relationship is determined based on the trigger state. Specifically, the configuration information of the first downlink signal may include configuration information on multiple / multiple groups of TCI states, and the association relationship is associated with the trigger state and indicated via the TCI state. When the first downlink signal is triggered, the UE may obtain the type of association relationship and uplink signal information associated with the first downlink signal based on the trigger state.

[0114] As an option, the configuration information or trigger information of the first downlink signal further includes identification information, which is for indicating a location of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

[0115] In the above embodiment, optionally, the uplink signal and the first downlink signal are both non-periodic signals, and trigger signaling of an uplink signal simultaneously triggers a first downlink signal associated therewith, and trigger signaling of a first downlink signal simultaneously triggers an uplink signal associated therewith.

[0116] Alternatively, the triggering method may be applicable to all types of association relationships. Alternatively, the triggering method may be applicable only to specific types of association relationships.

[0117] According to the above embodiments, the UE transmitting each uplink signal based on the transmission frequency of each uplink signal includes any one or more of the following:

[0118] Each uplink signal is assigned to a different time domain resource, i.e., each uplink signal is transmitted in a time division multiplexed manner. Specifically, uplink signals corresponding to different TRPs are assigned to different time domain resources of the same frequency domain resource, such as different symbols, different time slots, different REs, etc. This method can avoid interference between subcarriers caused by uplink signals with multiple mismatched transmission frequency points, but uses more time domain resources.

[0119] Alternatively, each of the uplink signals may be allocated to a different frequency domain resource with a guard interval t between them, i.e., each of the uplink signals may be transmitted in a frequency division multiplexing manner with a guard interval t between different uplink signals. Specifically, uplink signals corresponding to different TRPs may be allocated to different frequency domain resources at the same time with a guard interval t between them, and the guard interval t may be at the subcarrier level, PRB level, etc. This method can save time domain resources and avoid inter-subcarrier interference caused by uplink signals with multiple transmission frequency points that do not coincide.

[0120] Each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

[0121] In the method according to the embodiment of the present application, the terminal determines a corresponding downlink receiving frequency for each received first downlink signal, and determines the transmission frequency of each uplink signal based on the downlink receiving frequency. Each first downlink signal has a predetermined relationship with each uplink signal, and each transmitting / receiving point can independently perform shift estimation and pre-compensation. Since each transmitting / receiving point has pre-compensated for downlink Doppler shift, the signals received by the UE from each transmitting / receiving point are Doppler shift-compensated. If there is no error, the Doppler shift is fully compensated, and the signals received by the UE from each transmitting / receiving point are Doppler shift-free, thereby reducing channel estimation error and improving downlink transmission performance.

[0122] FIG. 2 is a schematic flowchart of a signal transmission method according to another embodiment of the present application. As shown in FIG. 2, the execution body of the method may be a network device, such as a TRP or a TRP group. Hereinafter, the TRP will be taken as an example for description, and the method includes at least step 200 to step 202.

[0123] Step 200: Send a first downlink signal to a terminal, and the terminal determines a transmission frequency of an uplink signal having an association relationship with the first downlink signal based on a downlink receiving frequency corresponding to the first downlink signal.

[0124] In an HST-SFN scenario, a UE receives first downlink signals respectively delivered by a plurality of transmission / reception points (TRPs), i.e., for example, an HST-SFN scenario includes a plurality of transmission / reception points (TRPs), each of which transmits its own first downlink signal to a UE in the HST-SFN scenario. Furthermore, to avoid the problem in the prior art that each TRP cannot estimate the Doppler shift experienced by the downlink signal or the uplink signal, and therefore cannot effectively perform Doppler shift pre-compensation, in the method according to the present embodiment, each of the first downlink signals delivered to the UE by each TRP has a relationship with an uplink signal, and the UE transmits the uplink signal based on the relationship.

[0125] After receiving the first downlink signals, the UE can first determine a downlink receiving frequency corresponding to each of the first downlink signals. The downlink receiving frequency described in the embodiments of the present application refers to the receiving frequency at which the UE receives the first downlink signals. The method for the UE to respectively determine the transmission frequency of each uplink signal associated with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals may include various methods. The specific method is the same as that of the above-mentioned embodiment, and will not be described again here.

[0126] Step 201: Receive an uplink signal transmitted by the terminal based on the transmission frequency and having the association relationship with the first downlink signal.

[0127] Step 202: Determine a frequency shift based on the uplink signal to determine a transmission frequency of a second downlink signal.

[0128] After determining the transmission frequencies of the uplink signals having an associated relationship with each first downlink signal, the UE transmits the corresponding uplink signals to each TRP according to the transmission frequencies, and can transmit the uplink signals using different transmission frequencies.

[0129] Each TRP can receive an uplink signal transmitted by a UE, which has a correlation with a previously transmitted first downlink signal, determine a frequency shift based on the uplink signal to perform frequency pre-compensation, and transmit a subsequent second downlink signal to the UE based on the pre-compensated transmission frequency.

[0130] Optionally, the network includes a plurality of TRPs, each TRP transmitting a different first downlink signal, and each TRP determines a frequency shift based on an uplink signal having the association relationship with the first downlink signal transmitted by the TRP, and uses the frequency shift to determine a transmission frequency of a second downlink signal transmitted by the TRP.

[0131] Optionally, the network includes multiple TRPs, which are grouped together, each TRP including one or more TRPs. Each TRP group transmits a different first downlink signal (in each TRP group, one or more TRPs can transmit the first downlink signal). Each TRP group determines a frequency shift corresponding to itself based on an uplink signal having the association relationship with the first downlink signal transmitted by itself, and uses the frequency shift to determine the transmission frequency of the second downlink signal transmitted by the TRP included in itself.

[0132] In an embodiment of the present application, the UE determines the transmission frequency (and / or frequency point) of the uplink signal to be transmitted to each transmission / reception point based on the first downlink signal transmitted by each transmission / reception point, and transmits each uplink signal using the transmission frequency. In this way, each transmission / reception point can obtain the Doppler shift of the terminal relative to itself, thereby performing frequency pre-compensation at each transmission / reception point to eliminate the Doppler shift and Doppler spread on the terminal side.

[0133] In the embodiments of the present application, the terms "first downlink signal" and "second downlink signal" are used to distinguish between downlink signals transmitted twice to a UE by the same TRP. The first downlink signal may be a downlink signal initially transmitted to a UE. Based on the first downlink signal, the UE can determine an associated uplink signal and determine the transmission frequency to be used to transmit the uplink signal from the TRP. The second downlink signal is a downlink signal transmitted by the TRP after frequency pre-compensation, thereby reducing channel estimation errors and improving downlink transmission performance. However, the first downlink signal and the second downlink signal may be different signals or two transmissions of the same signal. For example, when a UE first transmits a TRS for transmitting the uplink signal described in the present application, the TRS is the first downlink signal, and when the frequency-precompensated TRS is retransmitted a second time, the TRS is the second downlink signal.

[0134] In the method according to the embodiment of the present application, the terminal determines a corresponding downlink receiving frequency for each received first downlink signal, and determines a transmission frequency for each uplink signal based on the downlink receiving frequency, where each first downlink signal has a predetermined relationship with each uplink signal, and each transmitting / receiving point can independently perform shift estimation and pre-compensation, and each transmitting / receiving point has pre-compensated for downlink Doppler shift, thereby reducing channel estimation error and improving downlink transmission performance.

[0135] According to the above embodiment, the network equipment configures or indicates the association relationship between the uplink signal and the downlink signal, so that the terminal can determine the transmission frequency (and / or frequency point) of the uplink signal based on the downlink signal. As one method for the terminal to determine the transmission frequency of the uplink signal based on the downlink signal, the terminal can determine the corresponding downlink frequency (and / or frequency point) based on one downlink signal, and then determine the frequency (and / or frequency point) of the uplink signal based on this downlink frequency and the difference between the uplink and downlink frequencies. For example, the downlink frequency point determined by the terminal is f DL The difference between the uplink and downlink frequencies is f d If the uplink frequency is f DL +f d It can be determined that this is the case.

[0136] In this embodiment, the order of the steps of the TRP establishing the association and the UE transmitting the first downlink signal is not particularly limited. The UE uses the detected first downlink signal based on the configured or instructed association, to determine the transmission frequency (e.g., frequency point) of the uplink signal having the association with the detected first downlink signal, and transmits the uplink signal at the transmission frequency based on the configuration or instruction for the uplink signal. Each TRP receives its corresponding uplink signal, and the TRP uses its corresponding uplink signal to determine a frequency shift and uses the frequency shift to determine the transmission frequency of the subsequent downlink transmission (performing frequency pre-compensation for the transmission of the downlink signal). The uplink signal corresponding to the TRP refers to the uplink signal having the association with the downlink signal transmitted by the TRP.

[0137] In the above embodiment, step 202 includes: determining a frequency adjustment value for a subsequent downlink signal based on the frequency shift in step 2021; and determining 2022 the transmission frequency of a subsequent downlink signal (second downlink signal) using the frequency adjustment value.

[0138] Here, one method for the TRP to determine the frequency shift based on the uplink signal corresponding to itself is for the TRP to receive the uplink signal corresponding to itself, perform shift estimation, and obtain a frequency shift value for pre-compensation through the shift estimation.

[0139] Alternatively, the pre-compensation frequency shift value of a subsequent downlink signal transmitted by a TRP is equal to a function of a shift estimate obtained by the TRP using an uplink signal having a relationship with the first downlink signal transmitted by the TRP. For example, the pre-compensation frequency shift value of a subsequent downlink signal transmitted by a TRP is equal to a shift estimate obtained by the TRP using an uplink signal having a relationship with the first downlink signal transmitted by the TRP. For example, the pre-compensation frequency shift value of a subsequent downlink signal transmitted by a TRP is equal to a negative value of a shift estimate obtained by the TRP using an uplink signal having a relationship with the first downlink signal transmitted by the TRP. For example, the pre-compensation frequency shift value of a subsequent downlink signal transmitted by a TRP is equal to half of a shift estimate obtained by the TRP using an uplink signal having a relationship with the first downlink signal transmitted by the TRP. For example, the pre-compensation frequency shift value of a subsequent downlink signal transmitted by one TRP is equal to the negative of half the shift estimate obtained using an uplink signal that has a correlation with the first downlink signal transmitted by the TRP itself.

[0140] Alternatively, there may be multiple TRPs in the network, and these TRPs may be grouped, and the pre-compensation frequency shift value of a subsequent downlink signal transmitted by one of all TRPs in a TRP group may be equal to a function of a shift estimate obtained using an uplink signal that has a relationship with the first downlink signal transmitted by the TRP group itself. For example, the pre-compensation frequency shift value of a subsequent downlink signal transmitted by all TRPs in a TRP group may be equal to a shift estimate obtained using an uplink signal that has a relationship with the first downlink signal transmitted by the TRP group itself. For example, the pre-compensation frequency shift value of a subsequent downlink signal transmitted by all TRPs in a TRP group may be equal to a negative value of a shift estimate obtained using an uplink signal that has a relationship with the first downlink signal transmitted by the TRP group itself. For example, the pre-compensation frequency shift value of a subsequent downlink signal transmitted by all TRPs in a TRP group may be equal to half of a shift estimate obtained using an uplink signal that has a relationship with the first downlink signal transmitted by the TRP group itself. For example, the pre-compensation frequency shift value of subsequent downlink signals transmitted by all TRPs in a TRP group is equal to the negative of half the shift estimate obtained using an uplink signal that has an associated relationship with the first downlink signal transmitted by the TRP group itself.

[0141] As an option, a method for determining the transmission frequency of a subsequent downlink signal using the frequency adjustment value is to determine a frequency point of the subsequent downlink signal (second downlink signal) as the original frequency point plus the frequency adjustment value, and determine the transmission frequency of the subsequent downlink signal based on the frequency point.

[0142] As an option, a method for determining the transmission frequency of a subsequent downlink signal using the frequency adjustment value is to determine a frequency point of the subsequent downlink signal (second downlink signal) as the original frequency point minus the frequency adjustment value, and determine the transmission frequency of the subsequent downlink signal based on that frequency point.

[0143] As an option, a method of using the frequency adjustment value to determine the transmission frequency of the subsequent downlink signal is to determine the transmission frequency of the subsequent downlink signal as the frequency before frequency pre-compensation plus the frequency adjustment value.

[0144] As an option, a method of using the frequency adjustment value to determine the transmission frequency of the subsequent downlink signal is to determine the transmission frequency of the subsequent downlink signal as the frequency before frequency pre-compensation minus the frequency adjustment value.

[0145] Optionally, determining the transmission frequency of the subsequent downlink signal using the frequency adjustment value includes determining the downlink frequency point corresponding to each TRP as the original frequency point plus the frequency adjustment value corresponding to each TRP.

[0146] Optionally, determining the transmission frequency of the subsequent downlink signal using the frequency adjustment value includes determining the downlink frequency point corresponding to each TRP as the original frequency point of each TRP minus the frequency adjustment value respectively corresponding to each TRP.

[0147] Optionally, determining the transmission frequency of the subsequent downlink signal using the frequency adjustment value includes determining the downlink frequency point corresponding to the TRP in one TRP group as the original frequency point of the TRP group plus the frequency adjustment value corresponding to the TRP group.

[0148] Optionally, determining the transmission frequency of the subsequent downlink signal using the frequency adjustment value includes determining the TRP downlink frequency points within one TRP group as the original frequency points of each TRP minus the frequency adjustment value corresponding to each TRP.

[0149] As an option, the method of using the frequency adjustment value to determine the transmission frequency of the subsequent downlink signal is that each TRP uses the frequency adjustment value to determine the transmission frequency of the subsequent downlink signal.

[0150] For example, the result of the shift estimation is f d and the frequency shift value for pre-compensation is -f d / 2 The shift estimation algorithm can use some of the shift estimation algorithms of the prior art. d / 2 The transmission frequency of the second downlink signal is pre-compensated using the frequency shift value estimation method, so that when the UE receives the downlink signal, only a small frequency shift remains. The frequency shift value estimation is an estimate of the difference between the received frequency of the uplink signal and the uplink actual frequency point.

[0151] Alternatively, the UE may not perform frequency pre-compensation for the first downlink signal to determine the pre-compensation frequency shift, so that the TRP can always use the same shift pre-compensation determination method.

[0152] Alternatively, the TRP may use one pre-compensation frequency determination method when the UE first accesses the TRP, and another pre-compensation frequency determination method in subsequent processes. For example, when the UE first accesses the TRP, the frequency shift value estimated by the TRP is f d Then, TRP is -f d / 2 The transmission frequency of the downlink signal can be pre-compensated using the TRP. Then, when the pre-compensation frequency estimation is performed using the uplink signal, the frequency shift value estimated by the TRP is f d’Then, TRP is -f d’ can be used to pre-compensate the transmission frequency of the downlink signal.

[0153] In the above embodiment, the association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the first downlink signal; The receiving terminal of the uplink signal and the transmitting terminal of the first downlink signal are the same network equipment, that is, the receiving terminal of the uplink signal and the transmitting terminal of the first downlink signal are quasi co-located (QCL).

[0154] Based on the above association relationship between downlink and uplink signals, alternatively, some characteristics of the channel experienced by the target signal can be obtained from the source signal, or the spatial transmit parameters of the target signal can be obtained from the spatial receive parameters of the source signal.

[0155] The association relationship is a QCL relationship, and the type of the association relationship includes one or more of the following types:

[0156] Type 1 ('QCL-TypeA'): {Doppler shift, Doppler spread, average delay, delay spread}, Type 2 ('QCL-TypeB'): {Doppler shift, Doppler spread}, Type 3 ('QCL-TypeC'): {Doppler shift, average delay}, Type 4 (e.g., 'QCL-TypeE'): {Spatial parameter} or {Spatial related information SpatialRelationInofo} The spatial transmission parameters of the target signal can be obtained from the spatial reception parameters of the source signal, Type 5 (e.g., 'QCL-TypeF'): {Doppler shift}, Type 6: Frequency-related information (the transmission frequency of the target signal is determined based on the source signal); Type 7: A new QCL type that includes a Doppler shift.

[0157] Some possible association relationship types between uplink and downlink signals are shown in Table 2 below, and the association relationship may include one or more of the types in the following table, and if multiple types are included, it can be one of the combinations of Type 1 / 2 / 3 / 5 / 6+Type 4.

[0158] [Table 2]

[0159] As options, if Type 1 is included, the UE determines the Doppler shift, Doppler spread, mean delay, and delay spread of the uplink signal based on the first downlink signal. If Type 2 is included, the UE determines the Doppler shift and Doppler spread of the uplink signal based on the first downlink signal. If Type 3 is included, the UE determines the Doppler shift and mean delay of the uplink signal based on the first downlink signal. If Type 4 is included, the UE determines the transmit beam of the uplink signal based on the downlink signal. If Type 4 is included, the UE uses the receive spatial filter of the downlink signal as the transmit spatial filter of the uplink signal. If Type 5 is included, the UE determines the Doppler shift of the uplink signal based on the first downlink signal. If Type 6 is included, the UE determines the frequency-related information of the uplink signal based on the first downlink signal, and so on.

[0160] It can be understood that the association relationship may be indicated by other indication methods other than the QCL type method, and that as long as the function of the association relationship proposed in this application can be realized, it is included in the embodiments of this application.

[0161] As described in the above embodiments, optionally, the uplink signal includes, but is not limited to, one or more of SRS, RACH, PUSCH, PUCCH, DMRS corresponding to PUSCH, and DMRS corresponding to PUCCH.

[0162] Optionally, the first downlink signal includes, but is not limited to, one or more of SSB, TRS, and NZP-CSI RS.

[0163] As an option, the network side can instruct the UE to determine whether a downlink signal sent by the network side is the first downlink signal by one or more of the following methods:

[0164] Indication information of the network side: For example, the network side may directly indicate which signal is the first downlink signal, that is, determine it based on the association relationship indicated by the network side.

[0165] The configuration information of the first downlink signal: For example, it may be directly indicated in the configuration parameters of the downlink signal.

[0166] The type of the downlink signal: for example, all SSBs are considered to be primary downlink signals, or all TRSs are considered to be primary downlink signals, or the protocol agrees that downlink signals using a particular sequence are primary downlink signals, or the protocol agrees that downlink signals with particular characteristics are primary downlink signals, etc.

[0167] Optionally, the uplink signal further determines a Doppler shift, a Doppler spread, a mean delay, a delay spread, a transmit beam, etc. of the uplink signal based on the first downlink signal.

[0168] The following embodiment describes how the network side configures or indicates the association relationship to the UE.

[0169] In one method, the network side indicates the association relationship to the UE through dedicated signaling. Alternatively, the signaling is during uplink configuration (e.g., uplink-config). The association relationship is indicated through TCI signaling. For example, the TCI signaling is configured during uplink configuration.

[0170] Alternatively, the association relationship is included in configuration information or trigger information of the uplink signal, i.e., the network side is indicated by the configuration information or trigger information of the uplink signal, and the UE correspondingly determines the association relationship based on the configuration information or trigger information of the uplink signal. Alternatively, the configuration information of the uplink signal is transmitted via RRC signaling. Alternatively, the configuration information of the uplink signal is transmitted via MAC-CE signaling. Alternatively, the trigger information of the uplink signal is indicated via DCI signaling.

[0171] Alternatively, the configuration information or trigger information of the uplink signal may include information on a plurality of first downlink signals having the association relationship with the uplink signal, i.e., there are a plurality of first downlink signals having an association relationship with the uplink signal under the instruction of the configuration information or trigger information of the uplink signal. For example, the configuration information of the uplink signal may include configuration information on a plurality / multiple groups of TCI states, and the network side may also instruct the UE on the activated TCI states, and the UE may determine the type of association and the first downlink signal associated with the uplink signal based on the activated TCI states. The network side may send an activation signal to the UE to determine the first downlink signal having the association relationship with the uplink signal, and the UE may send the uplink signal to the network side after receiving the first downlink signal activated by the activation signal sent by the network side.

[0172] Furthermore, the configuration information or trigger information of the uplink signal may include information on a plurality of first downlink signals having the association relationship with the uplink signal, i.e., there are a plurality of first downlink signals having an association relationship with the uplink signal under the instruction of the configuration information or trigger information of the uplink signal. Each of the association relationships is associated with a trigger state, and the network side sends a trigger signal to trigger the uplink signal, and the UE determines the association relationship based on the trigger state. The configuration information of the uplink signal includes configuration information of a plurality / multiple groups of TCI states, and the association relationship is associated with a trigger state and indicated via the TCI state. When the uplink signal is triggered, the terminal can obtain the type of association relationship and first downlink signal information associated with the uplink signal based on the trigger state.

[0173] Furthermore, the configuration information or trigger information of the uplink signal may further include identification information, which is for indicating a location of a resource corresponding to the first downlink signal in a resource set where the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal. Specifically, multiple first downlink signals correspond to the same resource set, and the network side carries one identification information through the configuration information or trigger information of the uplink signal, which identification information is for indicating whether a downlink signal corresponding to the resource set is used to associate with the uplink signal, and the UE determines the first downlink signal corresponding to the resource set according to the location indicated by the identification information.

[0174] Alternatively, the association between the uplink signal and the first downlink signal is implicitly indicated.

[0175] The configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information to indicate that they have an associated relationship. For example, the configuration / trigger information of the uplink signal and the first downlink signal include identification information, and if one uplink signal has the same identification information as the first downlink signal, these two signals have an associated relationship. Alternatively, the type of the associated relationship is agreed upon in advance (e.g., specified by a protocol). Or, The configuration information or trigger information of the first downlink signal includes identification information, all uplink signals correspond to the same resource set, and each uplink signal for the resource set has a one-to-one correspondence with the identification information. Specifically, the configuration / trigger information of the first downlink signal includes specific identification information, all uplink signals corresponding to TRPs correspond to the same resource set, and the uplink signals corresponding to the resource set and the TRPs corresponding to the identification information have a one-to-one correspondence according to a predefined relationship. The corresponding uplink signal can be determined based on the identification information. Or, The first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources included in the different resource sets have a predefined one-to-one correspondence with the first downlink resources. Specifically, the first downlink signals all correspond to the same resource set type, and the uplink signals all correspond to the same resource set type, and the types of the uplink signals and the first downlink signals may be the same or different. There is a predefined one-to-one correspondence between the uplink resources and the downlink resources included in these resource set types. Based on the one-to-one correspondence, an association relationship between the uplink signal and the first downlink signal can be determined.

[0176] As another alternative, the association relationship is included in the configuration information or trigger information of the first downlink signal, i.e., the network side indicates it through the configuration information or trigger information of the first downlink signal, and the UE correspondingly determines the association relationship based on the configuration information or trigger information of the first downlink signal.

[0177] Optionally, the configuration information of the first downlink signal includes information of multiple uplink signals having the association relationship with the first downlink signal, i.e., under the instruction of the configuration information or trigger information of the first downlink signal, there are multiple uplink signals having an association relationship with the first downlink signal. Optionally, the UE can directly determine the uplink signal associated with the first downlink signal based on the configuration information.

[0178] As an option, the network side can send an activation signal, and the UE determines the uplink signal that has the association relationship with the first downlink signal; the UE can determine the uplink signal that has the association relationship with the first downlink signal based on the activation signal sent from the network side; specifically, the network side also indicates activated configuration information to the UE, and the UE determines the type of association relationship and the uplink signal associated with the first downlink signal based on the activated configuration information.

[0179] Alternatively, the configuration information of the first downlink signal may include information on multiple uplink signals having the association relationship with the first downlink signal. That is, multiple uplink signals may have an association relationship with the first downlink signal under the instruction of the configuration information or trigger information of the first downlink signal. Each of the association relationships is associated with a trigger state. The network side sends a trigger signal to trigger the first downlink signal, and the UE determines the association relationship based on the trigger state. Specifically, the configuration information of the first downlink signal may include configuration information on multiple / multiple groups of TCI states. The association relationship is associated with a trigger state and is indicated via the TCI state. When the first downlink signal is triggered, the UE may obtain the type of association relationship and uplink signal information associated with the first downlink signal based on the trigger state.

[0180] As an option, the configuration information or trigger information of the first downlink signal further includes identification information, which is for indicating a location of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

[0181] In the above embodiment, optionally, the uplink signal and the first downlink signal are both non-periodic signals, and trigger signaling of an uplink signal simultaneously triggers a first downlink signal associated therewith, and trigger signaling of a first downlink signal simultaneously triggers an uplink signal associated therewith.

[0182] Alternatively, the triggering method may be applicable to all types of association relationships. Alternatively, the triggering method may be applicable only to specific types of association relationships.

[0183] Based on the above embodiments, each of the uplink signal transmission methods includes one or more of the following:

[0184] Each uplink signal is allocated to a different time domain resource, specifically, uplink signals corresponding to different TRPs are allocated to different time domain resources of the same frequency domain resource, such as different symbols, different time slots, different REs, etc. This method can avoid interference between subcarriers caused by uplink signals with multiple mismatched transmission frequency points, but uses more time domain resources.

[0185] Alternatively, each of the uplink signals may be allocated to different frequency domain resources with a guard interval σ between them, specifically, uplink signals corresponding to different TRPs may be allocated to different frequency domain resources in the same time with a guard interval σ between them, and the guard interval σ may be at a subcarrier level, a PRB level, etc. This method can save time domain resources and avoid inter-subcarrier interference caused by uplink signals with multiple mismatched transmission frequency points.

[0186] Each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

[0187] In the method according to the embodiment of the present application, the terminal determines a corresponding downlink receiving frequency for each received first downlink signal, and determines the transmission frequency of each uplink signal based on the downlink receiving frequency. Each first downlink signal has a predetermined relationship with each uplink signal, and each transmitting / receiving point can independently perform shift estimation and pre-compensation. Since each transmitting / receiving point has pre-compensated for downlink Doppler shift, the signals received by the UE from each transmitting / receiving point are Doppler shift-compensated. If there is no error, the Doppler shift is fully compensated, and the signals received by the UE from each transmitting / receiving point are Doppler shift-free, thereby reducing channel estimation error and improving downlink transmission performance.

[0188] Hereinafter, an example of a method for frequency pre-compensation in a base station according to an embodiment of the present application will be described. For example, one BBU is connected to four TRPs, specifically, four remote radio heads (RRHs). Depending on the direction of travel of the train, the sequence in which the train passes through these RRHs is RRH1, RRH2, RRH3, and RRH4. Table 3 shows a comparison table of the frequencies at which the downlink signals from each remote radio head (RRH) arrive at the UE before and after frequency pre-compensation. Assuming that the Doppler shift estimations of the RRHs and the UE are ideal, the unidirectional Doppler shifts of RRH1, RRH2, RRH3, and RRH4 are f1, f2, f3, and f4, respectively, and the frequency pre-compensation value is half the Doppler shift determined based on the uplink signals received by the RRHs. Therefore, in this embodiment, the Doppler shift of the downlink signals from each remote radio head (RRH) received by the UE can be eliminated, resulting in better downlink reception performance for the UE.

[0189] The frequency values of the downlink signal from each RRH point received by the UE before and after frequency pre-compensation. [Table 3]

[0190] FIG. 3 is a schematic diagram of the configuration of a terminal according to an embodiment of the present application. As shown in FIG. 3, the terminal includes: a first receiving module 301, a first determining module 302, and a first sending module 303, where: The first receiving module 301 is for receiving a plurality of first downlink signals; the first determining module 302 is for determining a downlink receiving frequency corresponding to each of the first downlink signals, and for respectively determining a transmission frequency of each uplink signal having a correlation with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals; the first transmitting module 303 is for transmitting each of the uplink signals based on the transmission frequency of each uplink signal, wherein the frequency shift determined based on the uplink signal having the correlation with the first downlink signal is for determining the transmission frequency of a second downlink signal.

[0191] In an embodiment of the present application, the terminal determines a corresponding downlink receiving frequency for each received first downlink signal, and determines the transmission frequency of each uplink signal based on the downlink receiving frequency. Each first downlink signal has a predetermined relationship with each uplink signal, and each transmitting / receiving point can independently perform shift estimation and pre-compensation. Since each transmitting / receiving point has pre-compensated for downlink Doppler shift, the signals received by the UE from each transmitting / receiving point are Doppler shift-compensated. If there is no error, the Doppler shift is fully compensated, and the signals received by the UE from each transmitting / receiving point are Doppler shift-free, thereby reducing channel estimation errors and improving downlink transmission performance.

[0192] 4 is a schematic structural diagram of a terminal according to another embodiment of the present application. As shown in FIG. 4, the terminal 400 may include at least one processor 401, a memory 402, at least one network interface 404, and another user interface 403. The components of the terminal 400 are coupled together by a bus system 405. It can be understood that the bus system 405 is used to realize communication connections between these components. In addition to a data bus, the bus system 405 further includes a power bus, a control bus, and a status signal bus. For clarity, various buses are illustrated as the bus system 405 in FIG. 4.

[0193] Here, the user interface 403 may include a display, a keyboard, or a pointing device such as a mouse, a trackball, a touchpad, or a touchscreen.

[0194] It may be understood that memory 402 in the present embodiment may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. Here, nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM) and used as an external cache. By way of example and not limitation, various types of RAM may be used, such as static random access memory (Static RAM, SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronously linked dynamic random access memory (Synchlink DRAM, SLDRAM), and direct memory bus random access memory (Direct Rambus RAM, DRRAM). The memory 402 of the systems and methods described in the embodiments herein includes, but is not limited to, these and any other suitable types of memory.

[0195] In some embodiments, memory 402 stores executable modules or data structures, or a subset or extended set thereof, such as an operating system 4021 and application programs 4022 .

[0196] Here, the operating system 4021 includes various system programs such as a framework layer, a core library layer, and a driver layer, and is used to realize various basic services and process hardware-based tasks. The application programs 4022 include various application programs such as a media player and a browser, and are used to realize various application services. A program for implementing the method of the embodiment of the present application may be included in the application programs 7022.

[0197] In an embodiment of the present application, by calling a computer program or instruction stored in the memory 402, specifically, for example, a computer program or instruction stored in the application program 4022, the processor 401: receiving a plurality of first downlink signals; Determining a downlink receiving frequency corresponding to each of the first downlink signals, and determining a transmission frequency of each uplink signal having a correlation with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals; transmitting each uplink signal based on a transmission frequency of the each uplink signal; Here, the frequency shift determined based on the uplink signal having the correlation with the first downlink signal is used to determine the transmission frequency of the second downlink signal.

[0198] The above-described methods according to the embodiments of the present application can be applied to or implemented by the processor 401. The processor 401 may be an integrated circuit chip with signal processing capabilities. In the process of implementation, each step of the above-described method can be implemented by an integrated logic circuit of hardware in the processor 401 or instructions in the form of software. The processor 401 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. Each method, step, and logical block diagram disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present application can be directly embodied to be executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be arranged in a storage medium that is mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is arranged in the memory 402, and the processor 401 reads the information in the memory 402 and executes the steps of the above method in combination with its hardware.

[0199] It will be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For a hardware implementation, a processing unit may be implemented in one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSP Devices (DSPDs), Programmable Logic Devices (PLDs), Field-Programmable Gate Arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units, or a combination thereof, for performing the functions described herein.

[0200] For a software implementation, the techniques may be implemented with modules (e.g., processes, functions, etc.) that perform the functions described in the embodiments of the present application. The software code may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

[0201] Alternatively, in another embodiment, the association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the first downlink signal; The receiving terminal of the uplink signal and the transmitting terminal of the first downlink signal are the same network device.

[0202] Alternatively, in another embodiment, the association relationship is a QCL relationship, and the type of the association relationship is: Type 1: {Doppler shift, Doppler spread, average delay, delay spread}, Type 2: {Doppler shift, Doppler spread}, Type 3: {Doppler shift, average delay}, Type 4: {Spatial parameter} or {Spatial relation information SpatialRelationInofo}, Type 5: {Doppler shift}, Type 6: Frequency related information, Type 7: Includes one or more of the new QCL types that include Doppler shift.

[0203] Alternatively, in another embodiment, the association relationship is indicated by configuration or trigger information of the uplink signal.

[0204] Alternatively, in another embodiment: The configuration information or trigger information of the uplink signal includes information of the first downlink signals having the association relationship with the uplink signal, and correspondingly, the method further includes: determining the first downlink signals having the association relationship with the uplink signal based on an activation signal sent from a network side; or each of the association relationships is associated with a trigger state, and when the uplink signal is triggered, determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the uplink signal further includes identification information, which is for indicating a position of a resource corresponding to the first downlink signal in a resource set in which the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal.

[0205] Alternatively, in another embodiment, the configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information for indicating that they have an associated relationship; or The configuration information or trigger information of the first downlink signal includes identification information, and all uplink signals correspond to the same resource set, and each uplink signal for the resource set has a one-to-one correspondence with the identification information; or The first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources included in the different resource sets and the first downlink resources have a predefined one-to-one correspondence.

[0206] Alternatively, in another embodiment, the association relationship is indicated by configuration information or trigger information of the first downlink signal.

[0207] Alternatively, in another embodiment: The configuration information of the first downlink signal includes information of a plurality of uplink signals having the association relationship with the first downlink signal, and correspondingly, the method further includes: determining the uplink signal having the association relationship with the first downlink signal based on an activation signal sent from a network side; or each of the association relationships is associated with a trigger state, and when the first downlink signal is triggered, determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the first downlink signal further includes identification information, which is for indicating a position of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

[0208] Alternatively, in another embodiment, the step of transmitting each uplink signal based on a transmission frequency of each uplink signal may include: each said uplink signal being assigned to a different time domain resource; each of the uplink signals is allocated to a different frequency domain resource with a guard interval therebetween; and Each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

[0209] Alternatively, in another embodiment, the uplink signal includes, but is not limited to, one or more of an SRS, a RACH, a PUSCH, a PUCCH, a DMRS corresponding to a PUSCH, and a DMRS corresponding to a PUCCH.

[0210] Optionally, the first downlink signal includes, but is not limited to, one or more of SSB, TRS, and NZP-CSI RS.

[0211] Optionally, in another embodiment, determine whether a downlink signal is the first downlink signal based on one or more of the network side indication information, the configuration information of the downlink signal, and the type of the downlink signal.

[0212] The terminal according to the embodiment of the present application may implement each process implemented by the terminal in the above embodiment, and the description thereof will be omitted here to avoid repetition.

[0213] 5 is a schematic diagram of the structure of a terminal according to yet another embodiment of the present application, which may be a mobile phone, a tablet computer, a personal digital assistant (PDA), an e-reader, a portable game console, a point of sale (POS), an in-vehicle electronic device (in-vehicle computer), etc. As shown in FIG. 5 , the mobile terminal includes a radio frequency (RF) circuit 510, a memory 520, an input unit 530, a display unit 540, a processor 560, an audio circuit 570, a wireless fidelity (WiFi) module 580, and a power supply 590. Those skilled in the art will understand that the structure of the mobile phone shown in FIG. 5 is not limiting and may include more or fewer components than those shown, or may combine some components, separate some components, or include a different arrangement of components.

[0214] The input unit 530 can receive numeric or character information input by a user and generate signal inputs related to user settings and function control of the mobile terminal. Specifically, in an embodiment of the present application, the input unit 530 can include a touch panel 5301. The touch panel 5301, also referred to as a touch screen, can collect a user's touch operation on or near the touch panel 5301 (e.g., a user's operation on the touch panel 5301 using an appropriate object or accessory, such as a finger or a stylus) and drive a corresponding connected device according to a pre-set program. Optionally, the touch panel 5301 can include two parts: a touch detection device and a touch controller. The touch detection device detects the user's touch direction, detects a signal resulting from the touch operation, and transmits the signal to the touch controller. The touch controller receives touch information from the touch detection device, converts it into touch point coordinates, transmits them to the processor 560, and can receive and execute instructions transmitted by the processor 560. The touch panel 5301 can be implemented in various types, such as a resistive type, a capacitive type, an infrared type, and a surface acoustic wave type. In addition to the touch panel 5301, the input unit 530 may include other input devices 5302. The other input devices 5302 can be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the other input devices 5302 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, an optical mouse (an optical mouse is a touch-sensitive surface that does not display visual output or is an extension of the touch-sensitive surface formed by a touchscreen), etc.

[0215] Here, the display unit 540 can be used to display information input by or provided to a user, and various menu interfaces of the mobile terminal. The display unit 540 may include a display panel 5401. Here, the display panel 5401 may be arranged in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc.

[0216] It should be noted that the touch panel 5301 can cover the display panel 5401 to form a touch display, which detects a touch action on or near it and transmits it to the processor 560 to determine the type of touch event, and then the processor 560 provides a corresponding visual output on the touch display according to the type of touch event.

[0217] The touch display includes an application program interface display area and a common control display area. The arrangement of the application program interface display area and the common control display area is not particularly limited and may be arranged vertically or horizontally, etc., so that the two display areas can be distinguished. The application program interface display area can be used to display the application program interfaces. Each interface may include at least one application program icon and / or interface elements such as widget desktop controls. The application program interface display area may be a blank interface without any content. The common control display area can be used to display frequently used controls, such as a settings button, interface number, scroll bar, and application program icons such as a phone book icon.

[0218] The RF circuit 510 can be used to transmit and receive signals during information transmission and reception or during a call, particularly to receive downlink information from the network side and then send it to the processor 560 for processing, and to transmit configured uplink data to the network side. Typically, the RF circuit 510 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc. Note that the RF circuit 510 can also communicate with a network and other devices via wireless communication. The wireless communication may use any communication standard or protocol, including, but not limited to, Global System of Mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), etc.

[0219] The memory 520 is for storing software programs and modules, and the processor 560 executes the software programs and modules stored in the memory 520 to perform various functional applications and data processing of the mobile terminal. The memory 520 may mainly include a program storage area and a data storage area, where the program storage area can store an operating system, an application program required for at least one function (e.g., an audio playback function, an image playback function, etc.), etc., and the data storage area can store data generated by use of the mobile terminal (e.g., audio data, a phone book, etc.). The memory 520 may include a high-speed random access memory, and may also include, for example, at least one nonvolatile memory such as a magnetic disk storage device, a flash storage device, or other volatile solid-state storage device.

[0220] Here, the processor 560 is the control center of the mobile terminal, and uses various interfaces and lines to connect each part of the entire mobile phone, runs or executes software programs and / or modules stored in the first memory 5201, and accesses data stored in the second memory 5202, thereby performing various functions and data processing of the mobile terminal, and thereby monitoring the entire mobile terminal. Optionally, the processor 560 may include one or more processing units.

[0221] In an embodiment of the present application, by calling software programs and / or modules stored in the first memory 5201 and / or data in the second memory 5202, the processor 560 is used for receiving a plurality of first downlink signals, determining a downlink receive frequency corresponding to each of the first downlink signals, and respectively determining a transmission frequency of each uplink signal having an associated relationship with each first downlink signal based on the downlink receive frequency corresponding to each first downlink signal, and transmitting each of the uplink signals based on the transmission frequency of each uplink signal, wherein the frequency shift determined based on the uplink signal having the associated relationship with the first downlink signal is for determining the transmission frequency of a second downlink signal.

[0222] The terminal according to the embodiment of the present application may implement each process implemented by the terminal in the above embodiment, and the description thereof will be omitted here to avoid repetition.

[0223] FIG. 6 is a schematic diagram of a network device according to an embodiment of the present invention. As shown in FIG. 6, the network device may be a TRP or a TRP group, where the TRP includes: a second sending module 601, a second receiving module 602, and a second determining module 603; The second transmitting module 601 is for transmitting a first downlink signal to a terminal, and for the terminal to determine a transmission frequency of an uplink signal having a correlation with the first downlink signal according to a downlink receiving frequency corresponding to the first downlink signal; the second receiving module 602 is for receiving an uplink signal transmitted by the terminal according to the transmission frequency and having the association relationship with the first downlink signal; The second determining module 603 is for determining a frequency shift according to the uplink signal, and determining the transmission frequency of the second downlink signal.

[0224] In an embodiment of the present application, the terminal determines a corresponding downlink receiving frequency for each received first downlink signal, and determines the transmission frequency of each uplink signal based on the downlink receiving frequency. Each first downlink signal has a predetermined relationship with each uplink signal, and each transmitting / receiving point can independently perform shift estimation and pre-compensation. Since each transmitting / receiving point has pre-compensated for downlink Doppler shift, the signals received by the UE from each transmitting / receiving point are Doppler shift-compensated. If there is no error, the Doppler shift is fully compensated, and the signals received by the UE from each transmitting / receiving point are Doppler shift-free, thereby reducing channel estimation errors and improving downlink transmission performance.

[0225] FIG. 7 is a schematic diagram of a network device according to another embodiment of the present application. As shown in FIG. 7, the network device 700 includes at least one processor 701, a memory 702, at least one other user interface 703, and a transceiver 704. The components of the base station 700 are coupled together by a bus system 705. It can be understood that the bus system 705 is used to realize communication between these components. In addition to a data bus, the bus system 705 also includes a power bus, a control bus, and a status signal bus. For clarity, various buses are shown as the bus system 705 in FIG. 7. The bus system may include any number of interconnected buses and bridges. Specifically, various circuits of one or more processors, such as the processor 701, and memories, such as the memory 702, are linked together. The bus system may also link various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and will not be described in the present embodiment. The bus interface provides an interface. The transceiver 704 may be multiple elements, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium. For different user equipment, the user interface 703 may be an interface that can connect required equipment externally / internally, and the connected equipment includes, but is not limited to, a keypad, a display, a speaker, a microphone, a joystick, etc.

[0226] It may be understood that memory 702 in the present embodiment may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. Here, nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM) and used as an external cache. By way of example and not limitation, various types of RAM may be used, such as static random access memory (Static RAM, SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronously linked dynamic random access memory (Synchlink DRAM, SLDRAM), and direct memory bus random access memory (Direct Rambus RAM, DRRAM). The memory 702 of the systems and methods described in the embodiments herein includes, but is not limited to, these and any other suitable types of memory.

[0227] The processor 701 is used to manage the bus system and general processing, and the memory 702 can store computer programs or instructions used by the processor 701 to perform operations. Specifically, the processor 701: The method can be used to transmit a first downlink signal to a terminal, and determine the transmission frequency of an uplink signal having a correlation with the first downlink signal based on the downlink receiving frequency corresponding to the first downlink signal by the terminal; receive an uplink signal having the correlation with the first downlink signal transmitted by the terminal based on the transmission frequency; determine a frequency shift based on the uplink signal, and determine the transmission frequency of a second downlink signal.

[0228] The above-described methods according to the embodiments of the present application can be applied to or implemented by a processor 701. The processor 701 may be an integrated circuit chip with signal processing capabilities. In the process of implementation, each step of the above-described method can be implemented by an integrated logic circuit of hardware in the processor 701 or instructions in the form of software. The processor 701 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. Each method, step, and logical block diagram disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present application can be directly embodied to be executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be arranged in a storage medium that is mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is arranged in the memory 702, and the processor 701 reads information in the memory 702 and executes the steps of the above method in combination with the hardware.

[0229] It may be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For a hardware implementation, a processing unit may be implemented in one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSP Devices (DSPDs), Programmable Logic Devices (PLDs), Field-Programmable Gate Arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units, or a combination thereof, for performing the functions described herein.

[0230] For a software implementation, the techniques may be implemented with modules (e.g., processes, functions, etc.) that perform the functions described in the embodiments of the present application. The software code may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

[0231] Alternatively, in another embodiment, the step of determining a frequency shift based on the uplink signal and determining a transmission frequency of the second downlink signal may include: determining a frequency adjustment value for a subsequent downlink signal based on the frequency shift; and using the frequency adjustment to determine a transmission frequency of a subsequent downlink signal.

[0232] Alternatively, in another embodiment, the association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the downlink signal; The receiving terminal of the uplink signal and the transmitting terminal of the downlink signal are the same network device.

[0233] Alternatively, in another embodiment, the association relationship is a QCL relationship, and the type of the association relationship is: Type 1: {Doppler shift, Doppler spread, average delay, delay spread}, Type 2: {Doppler shift, Doppler spread}, Type 3: {Doppler shift, average delay}, Type 4: {Spatial parameter} or {Spatial relation information SpatialRelationInofo}, Type 5: {Doppler shift}, Type 6: Frequency related information, Type 7: Includes one or more of the new QCL types that include Doppler shift.

[0234] Alternatively, in another embodiment, the association relationship is indicated by configuration or trigger information of the uplink signal.

[0235] Alternatively, in another embodiment: The configuration information of the uplink signal includes information of the plurality of first downlink signals having the association relationship with the uplink signal, and correspondingly, the method further includes: a network side sending an activation signal, and the terminal determining the first downlink signal having the association relationship with the uplink signal; or each of the association relationships is associated with one or more trigger states, and a network side sending a trigger signal to trigger the uplink signal, and the terminal determining the association relationship based on the trigger state; or The configuration information or trigger information of the uplink signal further includes identification information, which is for indicating a position of a resource corresponding to the first downlink signal in a resource set in which the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal.

[0236] Alternatively, in another embodiment, the configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information for indicating that they have an associated relationship; or The configuration information or trigger information of the first downlink signal includes identification information, and all uplink signals correspond to the same resource set, and each uplink signal for the resource set has a one-to-one correspondence with the identification information; or The first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources included in the resource sets and the first downlink resources have a predefined one-to-one correspondence.

[0237] Alternatively, in another embodiment, the association relationship is indicated by configuration information or trigger information of the first downlink signal.

[0238] Alternatively, in another embodiment: The configuration information of the first downlink signal further includes information of a plurality of uplink signals having the association relationship with the first downlink signal, and correspondingly, the method further includes: a network side sending an activation signal, and the terminal determining the uplink signal having the association relationship with the first downlink signal; or each of the association relationships is associated with a trigger state, and a network side sending a trigger signal to trigger the first downlink signal, and the terminal determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the first downlink signal further includes identification information, which is for indicating a position of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

[0239] Alternatively, in another embodiment, the transmission scheme of each of the uplink signals is: each said uplink signal being assigned to a different time domain resource; each of the uplink signals is allocated to a different frequency domain resource with a guard interval therebetween; and Each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

[0240] Alternatively, in another embodiment, the uplink signal includes, but is not limited to, one or more of an SRS, a RACH, a PUSCH, a PUCCH, a DMRS corresponding to a PUSCH, and a DMRS corresponding to a PUCCH.

[0241] Optionally, the first downlink signal includes, but is not limited to, one or more of SSB, TRS, and NZP-CSI RS.

[0242] Optionally, in another embodiment, the UE is instructed to determine whether a downlink signal is the first downlink signal based on one or more of the network side indication information, the configuration information of the downlink signal, and the type of the downlink signal.

[0243] The network device according to the embodiment of the present application can implement each process implemented by the network device in the above-described embodiment, and the description thereof will be omitted here to avoid repetition.

[0244] The above describes the technical solutions according to the embodiments of the present application from the perspective of terminals and network devices. To realize the above functions, it can be understood that the terminals and network devices according to the embodiments of the present application include corresponding hardware structures and / or software modules for performing each function. Those skilled in the art will easily understand that the present application can be realized in the form of hardware or a combination of hardware and computer software according to the units and algorithm steps of each example described in the embodiments disclosed herein.

[0245] Whether a function is implemented by hardware or by computer software driving the hardware is determined by the specific application and design constraints of the technical solution. Those skilled in the art may realize the described functions using different methods for each specific application, but such realization should not be considered beyond the scope of the present application.

[0246] In the embodiments of the present application, functional modules can be divided into electronic devices or the like according to the above-described method examples. For example, each functional module can be divided according to its function, or two or more functions can be integrated into one processing module. The integrated modules can be realized in the form of hardware or software functional modules.

[0247] However, in the embodiment of the present application, the division into modules is merely an example and is merely a logical division of functions, and other division methods may be used in actual implementation.

[0248] Those skilled in the art can clearly understand that for convenience and simplicity of explanation, the division of each functional module above is only described as an example, and in actual application, the allocation of the above functions can be performed by different functional modules as needed, that is, the internal structure of the device can be divided into various functional modules to perform all or part of the functions described above. For the specific work processes of the systems, devices and units described above, reference can be made to the corresponding processes in the above method embodiments, and the description thereof will be omitted here.

[0249] In some embodiments provided herein, it should be understood that the disclosed apparatus and method can be realized in other forms. For example, the apparatus embodiments described above are merely exemplary, and the division of the modules or units is merely a division of logical functions. In actual implementation, other division methods are possible. For example, multiple units or components can be combined or integrated into another system, or some functions can be omitted or not performed. Furthermore, the shown or discussed couplings or direct couplings or communication connections with each other may be indirect couplings or communication connections via some interfaces, devices, or units.

[0250] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. The objectives of the technical solution of this embodiment can be achieved by selecting some or all of the units herein according to actual needs.

[0251] Furthermore, 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 realized in the form of software functional units.

[0252] The above-mentioned integrated units can be realized in the form of software functional units and stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, all or part of the technical solution may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (e.g., a personal computer, a server, or a network device) or a processor to execute all or part of the steps of the method in each embodiment of the present application. The computer storage medium is a non-transitory medium, including various media that can store program code, such as a flash memory, a removable hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

[0253] The non-transitory computer-readable storage medium according to the embodiments of the present application is specifically for performing the processes of the signal transmission method according to the embodiments of each of the above methods, and its specific functions and flow can refer to the embodiments of the above methods, and the description thereof will be omitted here.

[0254] Finally, the above embodiments are merely for explaining the technical solutions of the present application, and are not intended to limit the technical solutions of the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified or some of the technical features thereof can be equivalently replaced, and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application. [Explanation of symbols]

[0255] 510 RF circuit 520 memory 530 Input Unit 540 display unit 560 processor 570 Audio Circuit 580 WiFi module 590 Power supply

Claims

1. A signal transmission method in which the execution body is a terminal, comprising: receiving a plurality of first downlink signals; Determine a downlink receiving frequency corresponding to each of the first downlink signals, and determine a transmission frequency of each uplink signal having an associated relationship with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals and an uplink-downlink frequency deviation, wherein the frequency deviation is agreed upon by a protocol, configured by signaling, or determined based on frequency indication information; transmitting each of the uplink signals based on a transmission frequency of each of the uplink signals; wherein the frequency shift determined based on the uplink signal having the association relationship with the first downlink signal is for determining the transmission frequency of a subsequent second downlink signal.

2. The association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the first downlink signal; 2. The signal transmission method according to claim 1, wherein the receiving terminal of the uplink signal and the transmitting terminal of the first downlink signal are the same network device.

3. The association relationship is a QCL relationship, and the type of the association relationship is: Type 1: {Doppler shift, Doppler spread, average delay, delay spread}, Type 2: {Doppler shift, Doppler spread}, Type 3: {Doppler shift, average delay}, Type 4: {Spatial reception parameters} or {SpatialRelationInformation}, Type 5: {Doppler shift}, 3. The signal transmission method according to claim 2, wherein the signal includes one or more of the following: Type 6: frequency-related information.

4. the association is indicated by configuration or trigger information of the uplink signal; or 4. The method of claim 2 or 3, wherein the association is indicated by configuration information or trigger information of the first downlink signal.

5. If the association relationship is indicated by configuration information or trigger information of the uplink signal, The configuration information or trigger information of the uplink signal includes information of the first downlink signals having the association relationship with the uplink signal, and the method further includes: determining the first downlink signal having the association relationship with the uplink signal based on an activation signal sent from a network side; Or, The configuration information or trigger information of the uplink signal includes information of the first downlink signals having the association relationship with the uplink signal, and the method further includes: each of the association relationships is associated with a trigger state; and when the uplink signal is triggered, determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the uplink signal includes identification information, and the identification information is for indicating a location of a resource corresponding to the first downlink signal in a resource set where the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal; If the association relationship is indicated by configuration information or trigger information of the first downlink signal, The configuration information of the first downlink signal includes information of a plurality of uplink signals having the association relationship with the first downlink signal, and the method further includes determining the uplink signal having the association relationship with the first downlink signal based on an activation signal transmitted from a network side; Or, the configuration information of the first downlink signal includes information of a plurality of the uplink signals having the association relationship with the first downlink signal, each of the association relationships being associated with one trigger state, and the method further includes, when the first downlink signal is triggered, determining the association relationship based on the trigger state; or 5. The signal transmission method of claim 4, wherein the configuration information or trigger information of the first downlink signal further includes identification information, the identification information being for indicating a position of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

6. the configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information for indicating that the association relationship exists; or The configuration information or trigger information of the first downlink signal includes identification information, and all the uplink signals correspond to the same resource set, and each of the uplink signals for the resource set has a one-to-one correspondence with the identification information; or 4. The signal transmission method according to claim 1, wherein the first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources and the first downlink resources included in the different resource sets have a predefined one-to-one correspondence.

7. The transmitting of each of the uplink signals based on the transmission frequency of each of the uplink signals as described above includes: each said uplink signal being assigned to a different time domain resource; each of the uplink signals is allocated to a different frequency domain resource with a guard interval therebetween; and 4. The signal transmission method according to claim 1, 2 or 3, characterized in that each of the uplink signals is not transmitted simultaneously with uplink signals for other uses.

8. The signal transmission method according to claim 1, 2 or 3, characterized in that the first downlink signal is determined based on one or more of the following: instruction information from the network side, configuration information of the downlink signal, and a type of the downlink signal.

9. A signal transmission method in which the execution body is a network device, Send a first downlink signal to a terminal, and the terminal determines a transmission frequency of an uplink signal having a correlation with the first downlink signal based on a downlink receiving frequency corresponding to the first downlink signal and an uplink-downlink frequency deviation, where the frequency deviation is agreed upon by a protocol, configured by signaling, or determined based on frequency indication information; receiving the uplink signal transmitted by the terminal based on the transmission frequency and having the association relationship with the first downlink signal; determining a frequency shift based on the uplink signal to determine a transmission frequency of a subsequent second downlink signal.

10. The association relationship is: one or more channel characteristics and / or spatial transmission parameters of the uplink signal may be inferred from one or more channel characteristics and / or spatial transmission parameters of the downlink signal; The signal transmission method according to claim 9, wherein the receiving terminal of the uplink signal and the transmitting terminal of the downlink signal are one or more of the same network equipment.

11. the association is indicated by configuration or trigger information of the uplink signal; or the association relationship is indicated by configuration information or trigger information of the first downlink signal; If the association relationship is indicated by configuration information or trigger information of the uplink signal, The configuration information or trigger information of the uplink signal includes information of the first downlink signals having the association relationship with the uplink signal, and the method further includes: determining the first downlink signal having the association relationship with the uplink signal based on an activation signal sent from a network side; or The configuration information or trigger information of the uplink signal includes information of the first downlink signals having the association relationship with the uplink signal, and the method further includes: each of the association relationships is associated with a trigger state; and when the uplink signal is triggered, determining the association relationship based on the trigger state; Or, The configuration information or trigger information of the uplink signal further includes identification information, the identification information being for indicating a location of a resource corresponding to the first downlink signal in a resource set in which the resource corresponding to the first downlink signal is located, and the first downlink signal has the association relationship with the uplink signal; If the association relationship is indicated by configuration information or trigger information of the first downlink signal, The configuration information of the first downlink signal includes information of a plurality of uplink signals having the association relationship with the first downlink signal, and the method further includes determining the uplink signal having the association relationship with the first downlink signal based on an activation signal transmitted from a network side; Or, The configuration information of the first downlink signal includes information of a plurality of the uplink signals having the association relationship with the first downlink signal, and the method further includes: each of the association relationships being associated with one trigger state; and when the uplink signal is triggered, determining the association relationship based on the trigger state; Or, 11. The signal transmission method of claim 10, wherein the configuration information or trigger information of the first downlink signal further includes identification information, the identification information being for indicating a position of a resource corresponding to the uplink signal in a resource set in which the resource corresponding to the uplink signal is located, and the uplink signal has the association relationship with the first downlink signal.

12. the configuration information or trigger information of the uplink signal and the configuration information or trigger information of the first downlink signal include identification information for indicating that the association relationship exists; or The configuration information or trigger information of the first downlink signal includes identification information, and all the uplink signals correspond to the same resource set, and each of the uplink signals for the resource set has a one-to-one correspondence with the identification information; or 11. The signal transmission method according to claim 9, wherein the first downlink signal and the uplink signal correspond to different resource sets, respectively, and the uplink resources and the first downlink resources included in the resource sets have a predefined one-to-one correspondence.

13. On the network side, Network side instruction information, Configuration information of the downlink signal; and 11. The method of claim 9, further comprising instructing the terminal to transmit the first downlink signal based on one or more types of the downlink signal.

14. 1. A terminal including a memory, a processor, and a program stored in the memory and executable by the processor, the program, when executed by the processor, receiving a plurality of first downlink signals; Determine a downlink receiving frequency corresponding to each of the first downlink signals, and determine a transmission frequency of each uplink signal having an associated relationship with each of the first downlink signals based on the downlink receiving frequency corresponding to each of the first downlink signals and an uplink-downlink frequency deviation, wherein the frequency deviation is agreed upon by a protocol, configured by signaling, or determined based on frequency indication information; transmitting each of the uplink signals based on a transmission frequency of each of the uplink signals; wherein the frequency shift determined based on the uplink signal having the association relationship with the first downlink signal is for determining the transmission frequency of a subsequent second downlink signal.

15. 1. A network device comprising: a memory; a processor; and a program stored in the memory and executable by the processor, wherein, when the program is executed by the processor, Send a first downlink signal to a terminal, and the terminal determines a transmission frequency of an uplink signal having a correlation with the first downlink signal based on a downlink receiving frequency corresponding to the first downlink signal and an uplink-downlink frequency deviation, where the frequency deviation is agreed upon by a protocol, configured by signaling, or determined based on frequency indication information; receiving the uplink signal transmitted by the terminal based on the transmission frequency and having the association relationship with the first downlink signal; determining a frequency shift based on the uplink signal to determine a transmission frequency of a subsequent second downlink signal.

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