Patent Description:
Embodiments of the disclosure relates to the technical field of communication, and in particular to a signal processing method and device.

In recent years, high-speed railways have been developed very rapidly, and the high-speed railways around the world have generally reached the speed of <NUM>/h, and some of them have even exceeded the speed of <NUM>/h. The increase of operating speed of the high-speed railway has a series of effects on mobile communication for the high-speed railway. For example, in a scenario of high-speed movement, a relative speed between a user and a base station is very high, causing a large Doppler frequency shift. When effective measures are not taken to suppress the Doppler effect, performance of a communication system will be seriously affected. Therefore, a terminal needs to estimate Doppler frequency shift of a signal.

Referring to <FIG>, a Building Base band Unit (BBU) is connected to three Remote Radio Heads (RRHs) by optical fibers, each of the RRHs has two antenna panels in different directions.

Signals transmitted by the RRHs are completely identical, and since the signals reach the terminal (e.g., User Equipment (UE)) through different paths, multiple "multipath" signals with different delays are received at the UE side, and the UE estimates the Doppler frequency based on a Tracking Reference Signal (TRS).

In the figure, two RRHs transmit data in two different directions, Doppler frequencies of the two channels are completely different or even opposite.

Therefore, from the perspective of the UE, the TRS transmitted by the two RRHs is similar to receiving two multipaths with completely different or even opposite Dopplers, and Doppler frequency estimated by the TRS is very inaccurate and cannot reflect actual Doppler frequencies of the two paths. Related technologies can be found in patent documents <CIT> and <CIT>, and in non-patent document CMCC: "<NPL>.

Embodiments of the disclosure provide a signal processing method and device, to solve a problem of how to accurately estimate frequencies of signals of different RRHs.

The present invention is defined in the appended set of claims.

In the embodiments of the disclosure, the network side may indicate the terminal to adjust the transmission frequency of the SRS according to the frequency estimated based on the TRS or the CSI-RS, so that the terminal may accurately estimate frequencies of signals transmitted by different network devices.

By reading detailed descriptions of alternative embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are intended to illustrate alternative embodiments only and are not intended to limit the disclosure. Furthermore, throughout the drawings, the same component is denoted by the same reference numeral. In the drawings:.

Technical solutions of the embodiments of the disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the disclosure. It is apparent that the described embodiments are part of but not all of the embodiments of the disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the disclosure without paying any creative work fall within the protection scope of the disclosure.

The term "include" as well as any variations thereof in the description and claims of the disclosure are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units are not necessarily limited to those steps or units clearly listed, but may include other steps or units which are not clearly listed or inherent to the process, method, product or device. Furthermore, the description and claims use "and/or" to denote at least one of the connected objects, for example, A and/or B denotes that there are three cases, i.e., including an individual A, an individual B, or both A and B.

In the embodiments of the disclosure, words such as "exemplary", "for example", or the like are are intended to be used as an example, examples, or explanations. In the embodiments of the disclosure, any embodiment or design scheme described as "exemplary" or "for example" should not be interpreted as being more preferable or advantageous than other embodiments or design schemes. Specifically, usage of the words such as "exemplary", "for example", or the like is intended to present relevant concepts in a specific way.

Technologies described herein are not limited to fifth-generation (<NUM>) mobile communication systems and subsequent evolutional communication systems, and are not limited to LTE/LTE-Advanced (LTE-A) systems, and may also be used in various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems.

Terms "system" and "network" are usually used interchangeably. CDMA system may implement radio technologies such as CDMA <NUM>, Universal Terrestrial Radio Access (UTRA), or the like. UTRA includes Wideband Code Division Multiple Access (WCDMA) and other CDMA variants. TDMA system may implement radio technologies such as Global System for Mobile Communication (GSM) or the like. OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), Evolution-UTRA (E-UTRA), IEEE <NUM> (Wi-Fi), IEEE <NUM> (WiMAX), IEEE <NUM>, Flash-OFDM, or the like. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE and more advanced LTE (such as LTE-A) are new UMTS releases using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named as "3rd Generation Partnership Project (3GPP)". CDMA <NUM> and UMB are described in documents from an organization named as "3rd Generation Partnership Project <NUM> (3GPP2)". The technologies described herein may be used in the above-mentioned systems and radio technologies as well as other systems and radio technologies.

Referring to <FIG>, an embodiment of the disclosure provides a processing method, the method is executed by a network device and includes a specific operation, i.e., operation <NUM>.

In operation <NUM>, first information is transmitted to the terminal. The first information includes information of a tracking reference signal (TRS) or a channel state information-reference signal (CSI-RS) associated with a sounding reference signal (SRS), and indicates a terminal to adjust a transmission frequency of the SRS according to a frequency estimated based on the TRS or the CSI-RS,.

In some implementations, the information of the TRS or the CSI-RS associated with the SRS includes at least one of:.

In some implementations, the parameters of the SRS may be any one of:.

In some implementations, based on the method shown in <FIG>, the method may further include the following operations before or after the operation <NUM>. A TRS or a CSI-RS with which the terminal performs frequency estimation is determined.

In an embodiment, the TRS or the CSI-RS with which the terminal performs frequency estimation may be determined in the following manners.

First manner: the TRS or the CSI-RS with which the terminal performs frequency estimation is determined according to downlink channel quality.

Exemplarily, a base station may determine channel quality of a RRH antenna panel according to feedback of the downlink channel quality, such as a Channel Quality Indicator (CQI) or the like, to further determine the frequency estimation to be performed by using the TRS or the CSI-RS transmitted by the RRH antenna panel.

Second manner: the TRS or the CSI-RS with which the terminal performs frequency estimation is determined according to uplink channel quality.

Exemplarily, channel quality of a RRH antenna panel may be determined by measuring the uplink channel quality, for example, by measuring uplink SRS, to further determine the frequency estimation to be performed by using the TRS or the CSI-RS transmitted by the RRH antenna panel.

Third manner: the TRS or the CSI-RS with which the terminal performs frequency estimation is determined according to indication information reported by the terminal.

The indication information may include TRS ID or CSI-RS ID. Exemplarily, UE explicitly reports a certain TRS ID or CSI-RS ID, for example, reports TRS1 or CSI-RS <NUM>, and notifies the base station that frequency estimation is performed by using the TRS1 or the CSI-RS <NUM>.

The indication information includes one or more SRSs corresponding to one or more TRSs or CSI-RSs. Exemplarily, the base station configures multiple SRSs for UE, and each of the SRSs is associated with a respective TRS or CSI-RS, for example, SRS1 is associated with TRS1 or CSI-RS1, SRS2 is associated with TRS2 or CSI-RS2. When the TRS <NUM> or the CSI-RS <NUM> is found to be better after measuring the TRS or the CSI-RS, UE transmits the SRS1 to the base station, so that the base station knows that UE performs frequency estimation by using the TRS1 or the CSI-RS <NUM>.

In an embodiment, the method further includes the following operations. An SRS is received from the terminal. Frequency estimated by the network device is determined according to the received SRS.

In an embodiment, the method may further include the following operations. A first frequency which is half of the frequency estimated by the network device is determined. The first frequency is transmitted, through an Xn interface, to other network devices around the network device.

In an embodiment, the method may further include the following operations. A first frequency which is half of the frequency estimated by the network device is determined. A subsequent PDCCH or PDSCH or downlink reference signal is transmitted with the first frequency.

In an embodiment, the method further includes the following operations before receiving the SRS from the terminal. The TRS or the CSI-RS is transmitted to the terminal with a frequency not subjected to frequency shift adjustment.

In the embodiment of the disclosure, each network device and different antenna panels of the network device transmit different TRSs or CSI-RSs. The TRS or the CSI-RS is transmitted at the frequency without frequency correction.

Referring to <FIG>, each RRH and different antenna panels of the RRH transmit different TRSs, i.e., the IDs of the TRSs are different. RRH1 transmits TRS0 and TRS1, RRH2 transmits TRS2 and TRS3, and RRH3 transmits TRS4 and TRS5, here TRS0, TRS1, TRS2, TRS3, TRS4 and TRS5 are transmitted at frequencies without frequency correction.

Furthermore, RRH1, RRH2 and RRH3 may exchange their estimated frequencies with interfaces (e.g., Xn interfaces) there-between, e.g., RRH1 informs RRH2 of a frequency Δf1.

In the embodiment of the disclosure, the network device divides the frequency estimated based on the SRS by <NUM>, to be used for subsequent transmission of the PDCCH or the PDSCH.

Referring to <FIG>, RRH1 informs RRH2 of the frequency Δf1, RRH1 transmits TRS1 at fc (a center frequency), UE estimates a frequency x is equal to fc- (fc+Δf1) based on TRS1 and transmits an SRS to RRH1 and RRH2 respectively with the frequency, the frequency estimated by RRH1 is 2Δf1, RRH1 divides the estimated frequency 2Δf1 by <NUM> and transmits signals carried on PDCCH/PDSCH at a frequency fc-Δf1.

With continued reference to <FIG>, RRH2 subtracts Δf1 based on interaction between base stations, RRH2 transmits signals carried on PDCCH/PDSCH to UE at a frequency fc-Δf2, and UE receive the signals carried on PDCCH/PDSCH at the frequency fc.

In the embodiment of the disclosure, the network side may indicate the terminal to adjust the transmission frequency of the SRS according to the frequency estimated based on the TRS or the CSI-RS, so that the terminal may accurately estimate frequencies of signals transmitted by different network devices.

Referring to <FIG>, an embodiment of the disclosure further provides a processing method, the method is executed by a terminal and includes a specific operation, i.e., operation <NUM>.

In operation <NUM>, first information is received. The first information includes information of a tracking reference signal (TRS) or a channel state information-reference signal (CSI-RS) associated with a sounding reference signal (SRS), and indicates the terminal to adjust a transmission frequency of the SRS according to frequency information estimated based on the TRS or the CSI-RS.

In some implementations, based on the method shown in <FIG>, the method may further include the following operations before or after the operation <NUM>.

Indication information is reported to a network device. The indication information indicates a TRS or a CSI-RS with which the terminal performs frequency estimation.

The indication information may include a TRS ID or a CSI-RS ID. Exemplarily, UE explicitly reports a certain TRS ID or CSI-RS ID, for example, TRS1 or CSI-RS <NUM>, and notifies the base station that frequency estimation is performed by using the TRS1 or the CSI-RS <NUM>.

The indication information may include one or more SRSs corresponding to one or more TRSs or CSI-RSs. Exemplarily, the base station configures multiple SRSs for the UE, and each of the SRSs is associated with a TRS or a CSI-RS, for example, SRS1 is associated with TRS1 or CSI-RS1, SRS2 is associated with TRS2 or CSI-RS2. When the TRS1 or the CSI-RS1 is found to be better after measuring the TRS or the CSI-RS, the UE transmits the SRS1 to the base station, so that the base station knows that UE performs frequency estimation by using the TRS1 or the CSI-RS <NUM>.

Referring to <FIG>, an embodiment of the disclosure further provides a network device <NUM>, including a first transmission module <NUM>.

The first transmission module <NUM> is configured to transmit first information to a terminal. The first information includes information of a TRS or a CSI-RS associated with an SRS, and indicates the terminal to adjust a transmission frequency of the SRS according to a frequency estimated based on the TRS or the CSI-RS.

In some implementations, based on those shown in <FIG>, the network device <NUM> may further include a first determination module. The first determination module is configured to determine a TRS or a CSI-RS with which the terminal performs frequency estimation.

Exemplarily, a base station may determine channel quality of a RRH antenna panel according to feedback of the downlink channel quality, such as a CQI or the like, to further determine the frequency estimation to be performed by using the TRS or the CSI-RS transmitted by the RRH antenna panel.

The indication information may include a TRS ID or a CSI-RS ID. Exemplarily, UE explicitly reports a certain TRS ID or CSI-RS ID, for example, TRS1 or CSI-RS1, and notifies the base station that frequency estimation is performed by using the TRS <NUM> or the CSI-RS <NUM>.

The indication information may include one or more SRSs corresponding to one or more TRSs or CSI-RSs. Exemplarily, the base station configures multiple SRSs for UE, and each of the SRSs is associated with a respecitve TRS or CSI-RS, for example, SRS1 is associated with TRS1 or CSI-RS1, SRS2 is associated with TRS2 or CSI-RS2. When the TRS <NUM> or the CSI-RS <NUM> is found to be better after measuring the TRS or the CSI-RS, UE transmits the SRS1 to the base station, so that the base station knows that UE performs frequency estimation by using the TRS1 or the CSI-RS <NUM>.

In some implementations, based on those shown in <FIG>, the network device <NUM> may further include a second receiving module and a second determination module.

The second receiving module is configured to receive an SRS from the terminal.

The second determination module is configured to determine, according to the received SRS, a frequency estimated by the network device.

In some implementations, based on those shown in <FIG>, the network device <NUM> may further include a third determination module and a second transmission module.

The third determination module is configured to determine a first frequency which is half of the frequency estimated by the network device.

The second transmission module is configured to transmit, through an Xn interface, the first frequency to other network devices around the network device.

In some implementations, based on those shown in <FIG>, the network device <NUM> may further include a fourth determination module and a transmitting module.

The fourth determination module is configured to determine a first frequency which is half of the frequency estimated by the network device.

The transmitting module is configured to transmit, by using the first frequency, a subsequent PDCCH or PDSCH or downlink reference signal.

In some implementations, based on those shown in <FIG>, the network device <NUM> may further include a third transmission module.

The third transmission module is configured to transmit the TRS or the CSI-RS to the terminal with a frequency not subjected to frequency shift adjustment, before receiving the SRS from the terminal.

The network device provided in the embodiment of the disclosure may execute the above method embodiment of <FIG>, the implementation principles and technical effects are similar, and are not elaborated here in the embodiment.

Referring to <FIG>, an embodiment of the disclosure further provides a network device <NUM>, including a first transceiver <NUM> and a first processor <NUM>. The first transceiver <NUM> is configured to transmit first information to a terminal. The first information includes information of a TRS or a CSI-RS associated with an SRS, and indicates the terminal to adjust a transmission frequency of the SRS according to a frequency estimated based on the TRS or the CSI-RS.

In some implementations, the parameter of the SRS may be any one of:.

In some implementations, the first processor <NUM> is configured to determine a TRS or a CSI-RS with which the terminal performs frequency estimation.

Explicit indication information may include TRS ID or CSI-RS ID. Exemplarily, UE explicitly reports a certain TRS ID or CSI-RS ID, for example, TRS1 or CSI-RS <NUM>, and notifies the base station that frequency estimation is performed by using the TRS1 or the CSI-RS <NUM>.

Implicit indication information may include one or more SRSs corresponding to one or more TRSs or CSI-RSs. Exemplarily, the base station configures multiple SRSs for UE, and each of the SRSs is associated with a respective TRS or CSI-RS, for example, SRS1 is associated with TRS1 or CSI-RS <NUM>, SRS2 is associated with TRS2 or CSI-RS2. When the TRS1 or the CSI-RS1 is found to be better after measuring the TRS or the CSI-RS, the UE transmits the SRS1 to the base station, so that the base station knows that UE performs frequency estimation by using the TRS1 or the CSI-RS <NUM>.

In some implementations, the first transceiver <NUM> may be further configured to receive an SRS from the terminal.

The first processor <NUM> may be further configured to determine, according to the received SRS, a frequency estimated by the network device.

In some implementations, the first processor <NUM> may be further configured to determine a first frequency which is half of the frequency estimated by the network device.

The first transceiver <NUM> may be further configured to transmit, through an Xn interface, the first frequency to other network devices around the network device.

The first processor <NUM> may be further configured to transmit, by using the first frequency, a subsequent PDCCH or PDSCH or downlink reference signal.

In some implementations, the first processor <NUM> may be further configured to transmit the TRS or the CSI-RS to the terminal with a frequency not subjected to frequency shift adjustment, before receiving the SRS from the terminal.

Referring to <FIG>, an embodiment of the disclosure further provides a terminal <NUM>, including a first receiving module <NUM>.

The first receiving module <NUM> is configured to receive first information. The first information includes information of a TRS or a CSI-RS associated with an SRS, and indicates the terminal to adjust a transmission frequency of the SRS according to a frequency estimated based on the TRS or the CSI-RS.

In some implementations, based on the method shown in <FIG>, the terminal <NUM> may further include a fourth transmission module.

The fourth transmission module is configured to report, to a network device, indication information indicating a TRS or a CSI-RS with which the terminal performs frequency estimation.

Explicit indication information may include TRS ID or CSI-RS ID. Exemplarily, UE explicitly reports a certain TRS ID, for example, TRS1, and notifies the base station that frequency estimation is performed by using the TRS1.

Implicit indication information may include one or more SRSs corresponding to one or more TRSs or CSI-RSs. Exemplarily, the base station configures multiple SRSs for UE, and each of the SRSs is associated with a respective TRS, for example, SRS1 is associated with TRS1, SRS2 is associated with TRS2. When the TRS1 is found to be better after measuring the TRS, UE transmits the SRS1 to the base station, so that the base station knows that UE performs frequency estimation by using the TRS1.

The terminal provided in the embodiment of the disclosure may execute the above method embodiment of <FIG>, the implementation principles and technical effects are similar, and are not elaborated here in the embodiment.

Referring to <FIG>, an embodiment of the disclosure further provides a terminal <NUM>, including a second transceiver <NUM> and a second processor <NUM>. The second transceiver <NUM> is configured to receive first information. The first information includes information of a TRS or a CSI-RS associated with an SRS, and indicates the terminal to adjust a transmission frequency of the SRS according to a frequency estimated based on the TRS or the CSI-RS.

In some implementations, the second transceiver <NUM> may be further configured to report, to a network device, indication information indicating a TRS or a CSI-RS with which the terminal performs frequency estimation.

Implicit indication information may include one or more SRSs corresponding to one or more TRSs or CSI-RSs. Exemplarily, the base station configures multiple SRSs for the UE, and each of the SRSs is associated with a respective TRS, for example, SRS1 is associated with TRS1, SRS2 is associated with TRS2. When the TRS1 is found to be better after measuring the TRS, the UE transmits the SRS1 to the base station, so that the base station knows that UE performs frequency estimation by using the TRS1.

Referring to <FIG>, it is a structural diagram of a communication device applied to an embodiment of the disclosure. As shown in <FIG>, the communication device <NUM> includes a processor <NUM>, a transceiver <NUM>, a memory <NUM>, and a bus interface. The processor <NUM> may be responsible for managing a bus architecture and general processing. The memory <NUM> may store data used by the processor <NUM> upon performing operations.

In an embodiment of the disclosure, the communication device <NUM> further includes a computer program stored on the memory <NUM> and executable by the processor <NUM>, the computer program implements operations of the above method of <FIG> or <FIG> when executed by the processor <NUM>.

In <FIG>, the bus architecture may include any number of interconnected buses and bridges, specifically, connected together by various circuits including one or more processors represented by the processor <NUM> and memories represented by the memory <NUM>. The bus architecture may also connect various other circuits, such as a peripheral device, a voltage regulator, a power management circuit, or the like together, which is well known in the art and thus is not described further here. The bus interface provides an interface. The transceiver <NUM> may include multiple elements, that is, include a transmitter and a receiver, to provide units for communicating with various other devices on a transmission medium.

The communication device provided in the embodiment of the disclosure may execute the above method embodiment of <FIG> or <FIG>, their implementation principles and technical effects are similar, and are not elaborated here in the embodiment.

Operations of the method or algorithm described in conjunction with contents disclosed by the disclosure may be implemented in form of hardware or in form of a processor executing software instructions. The software instructions may be consisted of corresponding software modules which may be stored in a Random Access Memory (RAM), a flash memory, a Read Only Memory (ROM), an Electrically Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a register, a hard disk, a mobile hard disk, a Compact Disk ROM (CD-ROM), or any other forms of storage mediums known in the art. An exemplary storage medium is coupled to the processor, enabling the processor to read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be part of the processor. The processor and the storage medium may be carried in an Application Specific Integrated Circuit (ASIC). Furthermore, the ASIC may be carried in a core network interface device. Of course, the processor and the storage media may also exist as discrete components in the core network interface device.

It may be appreciated by those skilled in the art that in at least one of the above examples, the functions described in the disclosure may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored in a computer-readable medium or transmitted as one or more instructions or codes on the computer-readable medium. The computer-readable medium includes a computer storage medium and a communication medium, and the communication medium includes any medium facilitating transmission of a computer program from one place to another. The storage medium may be any available medium accessible to a general purpose or special purpose computer.

It may be appreciated by those skilled in the art that the embodiments of the disclosure may be provided as a method, a system, or a computer program product. Therefore, the embodiments of the disclosure may take a form of an entire hardware embodiment, an entire software embodiment, or an embodiment combining software with hardware. Furthermore, the embodiments of the disclosure may take a form of a computer program product implemented on one or more computer-usable storage mediums containing computer-usable program codes (including, but not limited to, a magnetic disk memory, CD-ROM, an optical memory, or the like).

The units described as separate components may be or may not be physically separate, and the components shown as units may be or may not be physical units, i.e. they may be located in a place, or may be distributed over multiple network units. Part or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

Furthermore, the functional units in the embodiments of the disclosure may be integrated in a processing unit, or each of the unit may physically exist alone, or two or more of the units may be integrated in a unit.

When implemented in form of a software function module and sold or used as an independent product, the functions may be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the disclosure substantially or parts making contributions to the related art may be embodied in form of a software product, and the computer software product is stored in a storage medium, including multiple instructions for enabling a computer device (which may be a personal computer, a server, a network device, or the like) to execute all or part of operations of the methods in the embodiments of the disclosure. The above-mentioned storage medium includes various mediums capable of storing program codes such as a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk, an optical disk or the like.

It may be understood by those of ordinary skill in the art that all or part of the processes of the above method embodiments may be implemented by controlling related hardware through a computer program, the program may be stored in a computer-readable storage medium, and the program may include the processes of the above method embodiments when it is executed. The storage medium may be a magnetic disk, an optical disk, a ROM, a RAM, or the like.

It may be understood that these embodiments described in the embodiments of the disclosure may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, modules, units and subunits may be implemented in one or more ASICs, Digital Signal Processors (DSPs), DSP Devices (DSPDs), Programmable Logic Devices (PLDs), Field-Programmable Gate Arrays (FPGA), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in the disclosure, or a combinations thereof.

For software implementation, the technologies described in the embodiments of the disclosure may be implemented by modules (e.g., processes, functions, etc.) performing the functions described in the embodiments of the disclosure. The software codes may be stored in a memory and executed by a processor. The memory may be implemented in or out of the processor.

The embodiments of the disclosure are described with reference to flowcharts and/or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the disclosure. It may be understood that each process and/or block of the flowcharts and/or block diagrams, and a combination of processes and/or blocks of the flowcharts and/or block diagrams may be implemented by computer program instructions. The computer program instructions may be provided to a processor of a general purpose computer, a dedicated computer, an embedded processor, or another programmable data processing device to generate a machine, such that the instructions executed by the processor of the computer or another programmable data processing device generate an apparatus implementing the functions specified in one or more processes of the flowcharts and/or in one or more blocks of the block diagrams.

The computer program instructions may also be stored in a computer-readable memory capable of directing a computer or another programmable data processing device to operate in a particular way, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means that implement the functions specified in one or more processes of the flowcharts and/or in one or more blocks of the block diagrams.

Claim 1:
A signal processing method, applied to a base station, characterized in that the method comprises:
determining a plurality of different tracking reference signals, TRSs, or channel state information-reference signals, CSI-RSs, each to be transmitted by a respective one of panels of a plurality of Remote Radio Heads, RRHs, to perform Doppler frequency estimation,
transmitting the plurality of TRSs or CSI-RSs to the terminal;
transmitting (<NUM>), to a terminal, first information,
wherein the first information comprises information of association of the plurality of TRSs or CSI-RSs with a plurality of sounding reference signals, SRSs, wherein each of the plurality of SRSs is associated with a respective one of the plurality of TRSs or CSI-RSs, and the first information indicates the terminal to adjust a transmission frequency of each of the plurality of SRSs according to a Doppler frequency shift estimated by the terminal based on a respective one of the plurality of TRSs or CSI-RSs,
receiving one SRS of the plurality of SRSs with an estimated Doppler frequency shift corresponding to the SRS from the terminal; and
determining, according to the received one SRS, frequency estimated by the base station,
wherein the information of association of the plurality of TRSs or CSI-RSs with the plurality of SRSs comprises at least one of:
a parameter of each of the plurality of SRSs comprising a respective TRS identifier, ID, or a respective CSI-RS ID; or
a transmission configuration indication, TCI, state of each of the plurality of SRSs, wherein a quasi-colocation, QCL, in the TCI state is associated with the respective TRS ID or the respective CSI-RS ID.