Reference signal transmission method and apparatus

Abstract

A reference signal transmission method and apparatus, which relate to the technical field of communications, and can improve the accuracy of channel estimation on the basis of increasing the number of antenna ports. The method comprises: on the basis of a frequency-domain channel matrix associated with antenna ports and the frequency-domain sampling number of reference signals associated with the antenna ports, determining a frequency-domain resource mapping relationship of the reference signals; sending first information to a receiving-end device, wherein the first information is used for indicating the frequency-domain resource mapping relationship of the reference signals; and on the basis of the frequency-domain resource mapping relationship of the reference signals, sending or receiving the reference signals.

Description

Reference signal transmission method and device Technical Field

[0001] The embodiments of the present application relate to the field of communication technologies, and in particular to a method and apparatus for transmitting a reference signal. Background Art

[0002] In a communication system, a network device may send a reference signal to a terminal device through an antenna port, and the terminal device performs channel estimation based on the received reference signal.

[0003] Among them, by increasing the number of antenna ports, the time-frequency resources of the reference signal can be sparse, a higher number of transmission streams can be achieved, and communication performance can be improved.

[0004] To maintain the total reference signal overhead, the time-frequency density of antenna ports needs to be reduced accordingly as the number of antenna ports increases. This can be achieved by increasing the sampling interval. However, increasing the sampling interval reduces the sampling bandwidth, resulting in a higher proportion of aliasing energy, which affects the accuracy of channel estimation.

[0005] Therefore, how to improve the accuracy of channel estimation on the basis of increasing antenna ports has become a technical problem that needs to be solved urgently.

[0006] Summary of the Invention

[0007] The present application provides a reference signal transmission method and apparatus, which can improve the accuracy of channel estimation on the basis of increasing antenna ports.

[0008] In the first aspect, an embodiment of the present application provides a method for transmitting a reference signal, which can be executed by a transmitting device. Unless otherwise specified, the "transmitting device" in this application can refer to the transmitting device itself, or to a component in the transmitting device (such as a processor, chip, or chip system, etc.), or to a logic module or software that can implement all or part of the functions of the transmitting device. The method includes: determining the frequency domain resource mapping relationship of the reference signal based on the frequency domain channel matrix associated with the antenna port and the frequency domain sampling number of the reference signal associated with the antenna port; sending first information to the receiving device; wherein the first information is used to indicate the frequency domain resource mapping relationship of the reference signal; and sending or receiving the reference signal based on the frequency domain resource mapping relationship of the reference signal.

[0009] Based on the first aspect, the transmitting device can dynamically determine the frequency domain resource mapping relationship of the reference signal according to the frequency domain channel matrix associated with the antenna port and the frequency domain sampling number of the reference signal associated with the antenna port, and dynamically switch the frequency domain resource mapping relationship of the reference signal through the first information, so that on the basis of increasing the antenna port, it can dynamically obtain a better frequency domain sampling position, improve the accuracy of channel estimation, and improve communication performance.

[0010] In one possible design, the frequency domain resource mapping relationship interval of the reference signal is determined based on the frequency domain channel matrix and the frequency domain sampling number of the reference signal; the frequency domain resource mapping relationship of the reference signal is determined based on the frequency domain resource mapping relationship interval of the reference signal and the frequency domain sampling number of the reference signal.

[0011] Based on this possible design, the transmitting device can first determine the frequency domain resource mapping relationship interval of the reference signal, and then determine the frequency domain resource mapping relationship of the reference signal within the interval, thereby improving the reliability of the determined frequency domain resource mapping relationship.

[0012] In one possible design, the rank and first value of the frequency domain channel matrix are determined based on the frequency domain channel matrix; wherein the first value is the number of singular values ​​that meet the first condition in the singular value decomposition result of the frequency domain channel matrix, and the first condition is that the difference between the reconstructed matrix corresponding to the singular value and the frequency domain channel matrix is ​​less than or equal to the first threshold; based on the rank of the frequency domain channel matrix, the first value, and the frequency domain sampling number of the reference signal, the frequency domain resource mapping relationship interval of the reference signal is determined.

[0013] In one possible design, when the frequency domain sampling number of the reference signal is less than or equal to the first value, the frequency domain resource mapping relationship interval of the reference signal is the first frequency domain resource mapping relationship interval; or, when the frequency domain sampling number of the reference signal is greater than the first value and less than or equal to the rank of the frequency domain channel matrix, the frequency domain resource mapping relationship interval of the reference signal is the second frequency domain resource mapping relationship interval; or, when the frequency domain sampling number of the reference signal is greater than the rank of the frequency domain channel matrix, the frequency domain resource mapping relationship interval of the reference signal is the third frequency domain resource mapping relationship interval.

[0014] Based on the above two possible designs, the transmitting device can divide the frequency domain resource mapping relationship interval according to the rank of the frequency domain channel matrix, the first value, and the frequency domain sampling number of the reference signal, and then select an appropriate frequency domain resource mapping relationship indication method for each frequency domain resource mapping relationship interval to improve the reliability of the frequency domain resource mapping relationship.

[0015] In one possible design, first indication information is sent to a receiving device; wherein the first indication information is used to indicate a frequency domain resource mapping relationship interval of a reference signal.

[0016] Based on this possible design, the transmitting device can use the first indication information to explicitly indicate the frequency domain resource mapping relationship interval of the reference signal.

[0017] In one possible design, the first indication information includes the rank of the frequency domain channel matrix, a first value and the frequency domain sampling number of the reference signal; wherein the first value is the number of singular values ​​that meet the first condition in the singular value decomposition result of the frequency domain channel matrix, and the first condition is that the difference between the reconstructed matrix corresponding to the singular value and the frequency domain channel matrix is ​​less than or equal to the first threshold; or, the first indication information includes the interval index of the frequency domain resource mapping relationship interval of the reference signal; or, the first indication information includes the interval frequency domain range information of the frequency domain resource mapping relationship interval of the reference signal; or, the first indication information includes the interval position information of the frequency domain resource mapping relationship interval of the reference signal.

[0018] Based on this possible design, multiple feasible solutions are provided for the design of the first indication information.

[0019] In one possible design, singular value decomposition is performed on the frequency domain channel matrix to obtain a singular value decomposition result; and the number of frequency domain samples of the reference signal is determined based on the singular value decomposition result.

[0020] In one possible design, a pseudo-random sequence is determined based on a random number seed; the subcarrier associated with each frequency domain resource in one or more frequency domain resources associated with the reference signal is determined based on the pseudo-random sequence and the frequency domain sampling number of the reference signal; and the frequency domain resource mapping relationship is determined based on the position of the subcarrier associated with the reference signal in the frequency domain resource mapping relationship interval of the reference signal.

[0021] Based on this possible design, the transmitting device can determine the frequency domain resource mapping relationship according to the random number seed and the frequency domain sampling number of the reference signal, providing a feasible solution for determining the frequency domain resource mapping relationship.

[0022] In one possible design, the first information includes a random number seed.

[0023] In one possible design, the first information also includes the frequency domain sampling number of the reference signal.

[0024] Based on the above two possible designs, the transmitting device can send a random number seed (and the frequency domain sampling number of the reference signal) to the receiving device through the first information, which can reduce the signaling overhead on the basis that the receiving device can determine the frequency domain resource mapping relationship based on the random number seed and the frequency domain sampling number of the reference signal.

[0025] In one possible design, the first information is also used to indicate that the frequency domain resource mapping relationship interval of the reference signal is a third frequency domain resource mapping relationship interval.

[0026] Based on this possible design, the third frequency domain resource mapping relationship interval can be an area with a higher frequency domain density (i.e., a larger number of frequency domain samplings) and is less sensitive to the resource position of the reference signal. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the third frequency domain resource mapping relationship interval), the frequency domain resource mapping relationship can be indicated by using a random number seed and the frequency domain sampling number of the reference signal to improve the reliability of the frequency domain resource mapping relationship.

[0027] In one possible design, a frequency domain channel matrix is ​​subjected to singular value decomposition to obtain a singular value decomposition result; a projection matrix is ​​determined based on the singular value decomposition result; wherein the number of rows of the projection matrix is ​​equal to the number of frequency domain resources associated with the reference signal, and the number of columns of the projection matrix is ​​equal to the number of frequency domain subcarriers; a frequency domain sampling sequence is determined based on the projection matrix; and a frequency domain resource mapping relationship of the reference signal is determined based on the frequency domain sampling sequence.

[0028] Based on this possible design, the transmitting end device can determine the frequency domain resource mapping relationship according to the frequency domain sampling sequence, providing a feasible solution for determining the frequency domain resource mapping relationship.

[0029] In one possible design, a frequency domain sampling sequence index corresponding to the frequency domain sampling sequence is determined according to the frequency domain sampling sequence.

[0030] In one possible design, the first information includes a frequency domain sampling sequence index.

[0031] Based on this possible design, the transmitting device can send the frequency domain sampling sequence index to the receiving device through the first information, which can reduce the signaling overhead on the basis that the receiving device can determine the frequency domain resource mapping relationship according to the frequency domain sampling sequence index.

[0032] In one possible design, the first information is also used to indicate that the frequency domain resource mapping relationship interval of the reference signal is the second frequency domain resource mapping relationship interval.

[0033] Based on this possible design, the second frequency domain resource mapping relationship interval can be an area where the number of frequency domain samples is equivalent to the rank or first value of the frequency domain channel matrix. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the second frequency domain resource mapping relationship interval), the frequency domain resource mapping relationship can be indicated by means of frequency domain sampling sequence index to improve the reliability of the frequency domain resource mapping relationship.

[0034] In one possible design, a preset correspondence is sent to a receiving device; wherein the preset correspondence is used to indicate a frequency domain sampling sequence index and a frequency domain sampling sequence associated with the frequency domain sampling sequence index.

[0035] Based on this possible design, the transmitting device sends a preset correspondence to the receiving device, so that the receiving device can determine the frequency domain sampling sequence associated with the frequency domain sampling sequence index according to the preset correspondence, and further determine the frequency domain resource mapping relationship.

[0036] In one possible design, singular value decomposition is performed on the frequency domain channel matrix to obtain a singular value decomposition result; a projection matrix is ​​determined based on the singular value decomposition result; wherein the number of rows of the projection matrix is ​​equal to the number of frequency domain resources associated with the reference signal, and the number of columns of the projection matrix is ​​equal to the number of frequency domain subcarriers; a bit map is determined based on the projection matrix; wherein the bit map is used to indicate the subcarrier associated with each frequency domain resource in one or more frequency domain resources associated with the reference signal.

[0037] Based on this possible design, the transmitting end device can determine the frequency domain resource mapping relationship according to the bit map, providing a feasible solution for determining the frequency domain resource mapping relationship.

[0038] In one possible design, the first information includes a bit map.

[0039] Based on this possible design, the transmitting device may send a bit map to the receiving device via the first information to improve the reliability of the frequency domain resource mapping relationship.

[0040] In one possible design, the first information is also used to indicate that the frequency domain resource mapping relationship interval of the reference signal is the first frequency domain resource mapping relationship interval.

[0041] Based on this possible design, the first frequency domain resource mapping relationship interval can be an area with very low frequency domain density and is very sensitive to the resource position of the reference signal. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the first frequency domain resource mapping relationship interval), a bit map can be used to indicate the frequency domain resource mapping relationship to improve the reliability of the frequency domain resource mapping relationship.

[0042] In a second aspect, an embodiment of the present application provides a method for transmitting a reference signal, which can be executed by a receiving device. Unless otherwise specified, the "receiving device" in this application can refer to the receiving device itself, or a component in the receiving device (such as a processor, chip, or chip system, etc.), or a logical module or software that can implement all or part of the functions of the receiving device. The method includes: obtaining first information; wherein the first information is used to indicate the frequency domain resource mapping relationship of the reference signal associated with the antenna port; receiving or sending the reference signal according to the frequency domain resource mapping relationship of the reference signal.

[0043] Based on the second aspect, the transmitting device can dynamically switch the frequency domain resource mapping relationship of the reference signal through the first information, so that it can dynamically obtain a better frequency domain sampling position on the basis of increasing the antenna port, improve the accuracy of channel estimation, and improve communication performance.

[0044] In one possible design, the first information includes a random number seed.

[0045] In one possible design, the first information also includes the frequency domain sampling number of the reference signal.

[0046] Based on the above two possible designs, the transmitting device can send a random number seed (and the frequency domain sampling number of the reference signal) to the receiving device through the first information, which can reduce the signaling overhead on the basis that the receiving device can determine the frequency domain resource mapping relationship based on the random number seed and the frequency domain sampling number of the reference signal.

[0047] In one possible design, the first information is also used to indicate that the frequency domain resource mapping relationship interval of the reference signal is a third frequency domain resource mapping relationship interval.

[0048] Based on this possible design, the third frequency domain resource mapping relationship interval can be an area with a higher frequency domain density (i.e., a larger number of frequency domain samplings) and is less sensitive to the resource position of the reference signal. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the third frequency domain resource mapping relationship interval), the frequency domain resource mapping relationship can be indicated by using a random number seed and the frequency domain sampling number of the reference signal to improve the reliability of the frequency domain resource mapping relationship.

[0049] In one possible design, a pseudo-random sequence is determined based on a random number seed; the subcarrier associated with each frequency domain resource in one or more frequency domain resources associated with the reference signal is determined based on the pseudo-random sequence and the frequency domain sampling number of the reference signal; and the frequency domain resource mapping relationship is determined based on the position of the subcarrier associated with the reference signal in the third frequency domain resource mapping relationship interval.

[0050] Based on this possible design, the receiving device can determine the frequency domain resource mapping relationship according to the random number seed and the frequency domain sampling number of the reference signal, providing a feasible solution for determining the frequency domain resource mapping relationship.

[0051] In one possible design, the first information includes a frequency domain sampling sequence index.

[0052] Based on this possible design, the transmitting device can send the frequency domain sampling sequence index to the receiving device through the first information, which can reduce the signaling overhead on the basis that the receiving device can determine the frequency domain resource mapping relationship according to the frequency domain sampling sequence index.

[0053] In one possible design, the first information is also used to indicate that the frequency domain resource mapping relationship interval of the reference signal is the second frequency domain resource mapping relationship interval.

[0054] Based on this possible design, the second frequency domain resource mapping relationship interval can be an area where the number of frequency domain samples is equivalent to the rank or first value of the frequency domain channel matrix. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the second frequency domain resource mapping relationship interval), the frequency domain resource mapping relationship can be indicated by means of frequency domain sampling sequence index to improve the reliability of the frequency domain resource mapping relationship.

[0055] In one possible design, according to the frequency domain sampling sequence index, the frequency domain sampling sequence associated with the frequency domain sampling sequence index is determined from a preset correspondence relationship; wherein the preset correspondence relationship includes the frequency domain sampling sequence index and the frequency domain sampling sequence associated with the frequency domain sampling sequence index; according to the frequency domain sampling sequence, the subcarrier associated with each frequency domain resource in one or more frequency domain resources associated with the reference signal is determined; and the frequency domain resource mapping relationship is determined according to the position of the subcarrier associated with the reference signal in the second frequency domain resource mapping relationship interval.

[0056] Based on this possible design, the receiving end device can determine the frequency domain resource mapping relationship according to the frequency domain sampling sequence index, providing a feasible solution for determining the frequency domain resource mapping relationship.

[0057] In one possible design, the preset corresponding relationship is predefined; or, the preset corresponding relationship is received from the sending device.

[0058] In one possible design, the first information includes a bit map, wherein the bit map is used to indicate a subcarrier associated with each frequency domain resource in one or more frequency domain resources associated with a reference signal.

[0059] Based on this possible design, the transmitting device may send a bit map to the receiving device via the first information to improve the reliability of the frequency domain resource mapping relationship.

[0060] In one possible design, the first information is also used to indicate that the frequency domain resource mapping relationship interval of the reference signal is the first frequency domain resource mapping relationship interval.

[0061] Based on this possible design, the first frequency domain resource mapping relationship interval can be an area with very low frequency domain density and is very sensitive to the resource position of the reference signal. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the first frequency domain resource mapping relationship interval), a bit map can be used to indicate the frequency domain resource mapping relationship to improve the reliability of the frequency domain resource mapping relationship.

[0062] In one possible design, the frequency domain resource mapping relationship is used to indicate the position of the subcarrier associated with the reference signal in the first frequency domain resource mapping relationship interval.

[0063] In one possible design, first indication information is received from a transmitting device; wherein the first indication information is used to indicate a frequency domain resource mapping relationship interval of a reference signal.

[0064] Based on this possible design, the transmitting device can use the first indication information to explicitly indicate the frequency domain resource mapping relationship interval of the reference signal.

[0065] In one possible design, the first indication information includes the rank of the frequency domain channel matrix, a first value and the frequency domain sampling number of the reference signal; wherein the first value is the number of singular values ​​that meet the first condition in the singular value decomposition result of the frequency domain channel matrix, and the first condition is that the difference between the reconstructed matrix corresponding to the singular value and the frequency domain channel matrix is ​​less than or equal to the first threshold; or, the first indication information includes the interval index of the frequency domain resource mapping relationship interval of the reference signal; or, the first indication information includes the interval frequency domain range information of the frequency domain resource mapping relationship interval of the reference signal; or, the first indication information includes the interval position information of the frequency domain resource mapping relationship interval of the reference signal.

[0066] Based on this possible design, multiple feasible solutions are provided for the design of the first indication information.

[0067] In one possible design, when the first indication information includes the rank of the frequency domain channel matrix, a first value, and the frequency domain sampling number of the reference signal, when the frequency domain sampling number of the reference signal is less than or equal to the first value, the frequency domain resource mapping relationship interval of the reference signal is the first frequency domain resource mapping relationship interval; or, when the frequency domain sampling number of the reference signal is greater than the first value and less than or equal to the rank of the frequency domain channel matrix, the frequency domain resource mapping relationship interval of the reference signal is the second frequency domain resource mapping relationship interval; or, when the frequency domain sampling number of the reference signal is greater than the rank of the frequency domain channel matrix, the frequency domain resource mapping relationship interval of the reference signal is the third frequency domain resource mapping relationship interval.

[0068] In the third aspect, an embodiment of the present application provides a communication device, which can be applied to the transmitting device of the first aspect above to implement the functions performed by the transmitting device above. The communication device can be a transmitting device, or a chip or chip system or system on chip of the transmitting device, etc. The communication device can perform the functions performed by the transmitting device above through hardware, or can perform the corresponding software implementation through hardware. The hardware or software includes one or more modules corresponding to the above functions. For example, a transceiver module and a processing module. The transceiver module can independently complete the following transceiver operations, or cooperate with the processing module to complete the following transceiver operations; accordingly, the processing module can also independently complete the following processing operations, or cooperate with the transceiver module to complete the following processing operations, without limitation.

[0069] Exemplarily, a processing module is used to determine the frequency domain resource mapping relationship of the reference signal based on the frequency domain channel matrix associated with the antenna port and the frequency domain sampling number of the reference signal associated with the antenna port; the transceiver module is used to send first information to the receiving end device; wherein the first information is used to indicate the frequency domain resource mapping relationship of the reference signal; the transceiver module is also used to send or receive the reference signal according to the frequency domain resource mapping relationship of the reference signal.

[0070] Optionally, the transceiver module and processing module of the communication device in the third aspect can also perform the corresponding functions in the above-mentioned first aspect or any possible design of the first aspect. Please refer to the detailed description in the method example for details. The beneficial effects that can be achieved can also be referred to the above-mentioned related content.

[0071] In a fourth aspect, an embodiment of the present application provides a communication device, which can be applied to the receiving device of the second aspect above to implement the functions performed by the receiving device above. The communication device can be a receiving device, or a chip or chip system or system on chip of the receiving device, etc. The communication device can perform the functions performed by the receiving device above through hardware, or it can perform the corresponding software implementation through hardware. The hardware or software includes one or more modules corresponding to the above functions. For example, a transceiver module and a processing module. The transceiver module can independently complete the following transceiver operations, or it can cooperate with the processing module to complete the following transceiver operations; accordingly, the processing module can also independently complete the following processing operations, or it can cooperate with the transceiver module to complete the following processing operations, without limitation.

[0072] Exemplarily, the transceiver module is used to obtain first information; wherein the first information is used to indicate the frequency domain resource mapping relationship of the reference signal associated with the antenna port; the transceiver module is also used to receive or send the reference signal according to the frequency domain resource mapping relationship of the reference signal.

[0073] Optionally, the transceiver module and processing module of the communication device in the fourth aspect can also perform the corresponding functions in the above-mentioned second aspect or any possible design of the second aspect. Please refer to the detailed description in the method example for details. The beneficial effects that can be achieved can also be found in the above-mentioned related content.

[0074] In a fifth aspect, an embodiment of the present application provides a communication device, which includes one or more processors; one or more processors are used to run computer programs or instructions, and when the one or more processors execute the computer instructions or instructions, the reference signal transmission method described in any one of the first aspect to the second aspect is executed.

[0075] In one possible design, the communication device further includes one or more memories, the one or more memories being coupled to one or more processors, and the one or more memories being used to store the above-mentioned computer programs or instructions. In one possible implementation, the memory is located outside the communication device. In another possible implementation, the memory is located within the communication device. In an embodiment of the present application, the processor and the memory may also be integrated into one device, that is, the processor and the memory may also be integrated together. In one possible implementation, the communication device further includes a transceiver, and the transceiver is used to receive information and / or send information.

[0076] In one possible design, the communication device further includes one or more communication interfaces, the one or more communication interfaces are coupled to the one or more processors, and the one or more communication interfaces are used to communicate with other modules outside the communication device.

[0077] In a sixth aspect, an embodiment of the present application provides a communication device, which includes an interface circuit and a logic circuit; the interface circuit is used to input and / or output information; the logic circuit is used to execute the reference signal transmission method described in any one of the first to second aspects, and process and / or generate information based on the information.

[0078] In the seventh aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer instructions or programs. When the computer instructions or programs are run on a computer, the reference signal transmission method described in any one of the first to second aspects is executed.

[0079] In an eighth aspect, an embodiment of the present application provides a computer program product comprising computer instructions, which, when executed on a computer, enables the reference signal transmission method as described in any one of the first to second aspects to be executed.

[0080] In a ninth aspect, an embodiment of the present application provides a computer program, which, when executed on a computer, enables the reference signal transmission method as described in any one of the first to second aspects to be executed.

[0081] In the tenth aspect, an embodiment of the present application provides a chip, comprising: a processor, the processor being coupled to a memory, the memory being used to store programs or instructions, and when the program or instructions are executed by the processor, the reference signal transmission method as described in any one of the first aspect to the second aspect is executed.

[0082] Among them, the technical effects brought about by any one of the design methods in the fifth to tenth aspects can refer to the technical effects brought about by any one of the first to second aspects mentioned above, and will not be repeated here.

[0083] In the eleventh aspect, an embodiment of the present application provides a communication system, which may include a communication device for executing the communication described in the first aspect or any possible design of the first aspect and a communication device for executing the communication described in the second aspect or any possible design of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] FIG1 is a schematic diagram of a correspondence between DMRS and ports provided in an embodiment of the present application;

[0085] FIG2 is a schematic diagram of a correspondence between the number of ports, frequency domain sampling interval, and aliasing energy provided by an embodiment of the present application;

[0086] FIG3 is a schematic diagram of a communication system provided in an embodiment of the present application;

[0087] FIG4 is a schematic diagram of the composition of a communication device provided in an embodiment of the present application;

[0088] FIG5 is a flowchart of a reference signal transmission method provided in an embodiment of the present application;

[0089] FIG6 is a flowchart of determining a frequency domain resource mapping relationship interval of a reference signal provided by an embodiment of the present application;

[0090] FIG7 is a schematic diagram of a frequency domain resource mapping relationship interval of a reference signal provided by an embodiment of the present application;

[0091] FIG8 is a flowchart of a reference signal transmission method provided in an embodiment of the present application;

[0092] FIG9 is a schematic diagram of a method for determining a frequency domain resource mapping relationship of a reference signal provided in an embodiment of the present application;

[0093] FIG10 is a flowchart of a reference signal transmission method provided in an embodiment of the present application;

[0094] FIG11 is a schematic diagram of a typical frequency domain resource mapping relationship of a frequency domain resource mapping relationship interval of a reference signal provided by an embodiment of the present application;

[0095] FIG12 is a schematic diagram of a method for determining a frequency domain resource mapping relationship of a reference signal provided in an embodiment of the present application;

[0096] FIG13 is a schematic diagram of a frequency domain sampling sequence provided in an embodiment of the present application;

[0097] FIG14 is a flowchart of a reference signal transmission method provided in an embodiment of the present application;

[0098] FIG15 is a schematic diagram of a method for determining a frequency domain resource mapping relationship of a reference signal provided in an embodiment of the present application;

[0099] FIG16 is a schematic diagram of a method for determining a bitmap provided in an embodiment of the present application;

[0100] FIG17 is a flowchart of a reference signal transmission method provided in an embodiment of the present application;

[0101] FIG18 is a schematic diagram of a communication device provided in an embodiment of the present application;

[0102] FIG19 is a structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0103] Before describing the embodiments of the present application, the technical terms involved in the embodiments of the present application are described.

[0104] With the continuous advancement of communication technology, wireless communication systems have evolved from first-generation analog communications to fifth-generation (5G) New Radio (NR) communication systems and the development of 6G technologies. Throughout this complex evolution, high throughput and large connections have always been core challenges for wireless communication networks.

[0105] Among the various solutions for 5G NR and 6G, Massive Multiple Input Multiple Output (Massive MIMO) technology, a key technology that significantly improves system capacity and meets high-speed transmission requirements, is a key enabler. By leveraging spatial resources, Massive MIMO enables signals to achieve array gain, multiplexing and diversity gain, and interference cancellation gain without increasing system bandwidth, exponentially increasing communication system capacity and spectral efficiency.

[0106] In Massive MIMO technology, the importance of estimating the uplink or downlink channel is becoming increasingly apparent in order to send and receive data, obtain system synchronization, and feedback channel information. Channel estimation refers to the process of reconstructing or restoring the receiving channel to compensate for signal distortion caused by channel fading and noise fading. A reference signal known in advance by the transmitter and receiver can be used to track the time and frequency domain changes of the channel. This reference signal, also known as a pilot signal or reference signal (RS), is distributed across different resource elements (REs) in the two-dimensional time-frequency space within an orthogonal frequency division multiplexing (OFDM) symbol and has a known amplitude and phase.

[0107] To implement channel quality measurement for Massive MIMO technology, the 5G NR system defines the following reference signals: sounding reference signal (SRS), channel state information reference signal (CSI-RS), demodulation reference signal (DMRS), etc.

[0108] Among them, SRS can be used for uplink channel measurement. The network equipment can estimate the uplink channel based on the SRS sent by the terminal device, and perform frequency selection resource scheduling, power control, timing estimation and modulation / coding scheme order selection, and downlink precoding generation in time division duplex (TDD) based on the channel estimation results, without restriction.

[0109] Among them, CSI-RS can be used for downlink channel measurement corresponding to the physical antenna port (or also called antenna port, port, etc.). The terminal device can perform channel estimation for each port sent by the network device and use the channel estimation result to provide channel state information (CSI) feedback. The CSI may include: channel quality indicator (CQI), rank indicator (RI), precoding matrix indicator (PMI), layer indicator (LI) and other related information.

[0110] Among them, DMRS can be used to assist in the demodulation of the physical downlink shared channel (PDSCH). DMRS can include DMRS Type I (DMRS Type I) and DMRS Type II (DMRS Type II). As shown in (a) of Figure 1, in Rel-15, DMRS Type I can support a maximum of 8 ports, and the corresponding frequency domain density is one resource block (RB) corresponding to 3 REs (i.e., 3REs / RB). As shown in (b) of Figure 1, DMRS Type II can support a maximum of 12 ports, and the corresponding frequency domain density is 2REs / RB.

[0111] Among them, the DMRS used for PDSCH (i.e., DMRS for PDSCH) can have the following characteristics:

[0112] (1) It is divided into front-loaded DMRS (FL DMRS) and additional DMRS (Add-on DMRS). FL DMRS occupies 1 to 2 OFDM symbols (such as OFDM symbol 2 and OFDM symbol 3). When FL DMRS occupies 1 OFDM symbol, Add-on DMRS occupies 3 OFDM symbols; or when FL DMRS occupies 2 OFDM symbols, Add-on DMRS occupies 0 to 2 OFDM symbols.

[0113] (2) The rules are mapped to each scheduling unit (a scheduling unit can be a physical resource block pair (PRB pair)). A complete port mapping exists on any scheduling PRB (i.e., each port is mapped to each scheduling unit). A complete port mapping exists within any scheduling slot.

[0114] (3) DMRS PRB bundling: Consecutive PRBs are processed jointly in the frequency domain as a bundle or precoding resource block group (PRG) to improve reception performance.

[0115] (4) DMRS rate matching (DMRS RM): Indicates the number of code division multiplexing (CDM) group occupancy to confirm RM information.

[0116] Based on the above description of reference signals, sparse time-frequency resources of reference signals is one of the main ways to achieve a higher number of transmission streams.

[0117] Among them, by increasing the number of antenna ports, the time-frequency resources of the reference signal can be sparse, a higher number of transmission streams can be achieved, and communication performance can be improved.

[0118] For example, taking the reference signal as DMRS, in communication version 18 (Rel-18), DMRS Type I and DMRS Type II can be enhanced to obtain DMRS eType I and DMRS eType II. DMRS eType I can support a maximum of 16 ports, with a corresponding frequency domain density of 3RE / 2RB. DMRS eType II can support a maximum of 24 ports, with a corresponding frequency domain density of 1RE / RB. The frequency domain density of DMRS eType I and DMRS eType II is halved relative to that of DMRS Type I and DMRS Type II, respectively, to achieve sparse time-frequency resources for the reference signal.

[0119] To maintain the total reference signal overhead, the time-frequency density of antenna ports needs to be reduced accordingly as the number of antenna ports increases. This can be achieved by increasing the sampling interval. However, increasing the sampling interval reduces the sampling bandwidth, resulting in a higher proportion of aliasing energy, which affects the accuracy of channel estimation.

[0120] For example, taking the reference signal as DMRS, the design method of DMRS can be based on the uniform sampling theorem in the frequency domain (such as the Nyquist sampling theorem) and use an actual Wiener filter when the terminal device performs channel estimation. Among them, the actual Wiener filter needs to assume that the channel delay power spectrum satisfies a specific distribution (such as a negative exponential distribution). Within the range allowed by the channel frequency domain coherence bandwidth, the interpolation filtering performance is positively correlated with the frequency domain density of the reference signal.

[0121] Among them, the delay power spectrum can be:

[0122] The time-delay frequency domain autocorrelation function can be:

[0123] The actual Wiener filter coefficients can be:

[0124] Where p represents the pth DMRS port; τ represents the multipath delay; τ RMS represents the root mean square (RMS) of the multipath delay τ; Δ m Indicates timing deviation; Δ m ax represents the maximum value of multipath delay deviation; n represents the nth frequency domain position; m represents the mth frequency domain position; f represents frequency; FFT represents fast Fourier transform; I represents the covariance matrix of the channel matrix at the time-frequency resource position where the reference signal is located; rs Represents Unit matrices of the same dimension; SNR stands for signal-to-noise ratio.

[0125] Assuming the total DMRS overhead remains unchanged, as shown in Figure 2 (a), increasing the number of orthogonal DMRS ports (for example, from 24 to 72) requires a corresponding reduction in the frequency domain density of specific DMRS ports. This can be achieved by increasing the sampling interval. However, as shown in Figure 2 (b), increasing the sampling interval reduces the sampling bandwidth, resulting in energy aliasing in the delayed power spectrum of the DMRS channel response due to undersampling. This poses a significant challenge to channel estimation in terminal devices.

[0126] In summary, how to improve the accuracy of channel estimation on the basis of increasing antenna ports has become a technical problem that needs to be solved urgently.

[0127] In order to solve this technical problem, an embodiment of the present application provides a reference signal transmission method, in which the transmitting device can determine the frequency domain resource mapping relationship of the reference signal based on the frequency domain channel matrix associated with the antenna port and the frequency domain sampling number of the reference signal associated with the antenna port; and send first information to the receiving device; wherein the first information is used to indicate the frequency domain resource mapping relationship of the reference signal; the transmitting device can also send or receive the reference signal based on the frequency domain resource mapping relationship of the reference signal.

[0128] In an embodiment of the present application, the transmitting device can dynamically determine the frequency domain resource mapping relationship of the reference signal based on the frequency domain channel matrix associated with the antenna port and the frequency domain sampling number of the reference signal associated with the antenna port, and dynamically switch the frequency domain resource mapping relationship of the reference signal through the first information, so that on the basis of increasing the antenna port, it can dynamically obtain a better frequency domain sampling position, improve the accuracy of channel estimation, and improve communication performance.

[0129] The following describes in detail the implementation of the embodiments of the present application in conjunction with the accompanying drawings.

[0130] The reference signal transmission method provided in the embodiments of the present application can be used in any communication system, which can be a third generation partnership project (3GPP) communication system, for example, a long term evolution (LTE) system, or a fifth generation (5G) mobile communication system, a system of hybrid networking of LTE and 5G, a new radio (NR) system, an NR vehicle to everything (V2X) system, a TDD system, a frequency-division duplex (FDD) system, a device-to-device (D2D) communication system, a machine to machine (M2M) communication system, the Internet of Things (IoT), a narrowband Internet of Things (NB-IoT) system, a global system for mobile communications (GSM), an enhanced data rate for GSM evolution (EDGE), a wideband code division multiple access (CDMA) system, and the like. The following types of communication systems are not restricted: wireless communication systems (WCDMA), code division multiple access 2000 (CDMA), code division multiple access 2000 (CDMA), time division-synchronization code division multiple access (TD-SCDMA), enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), enhanced machine-type communication (eMTC), and various types of next-generation communication systems, such as the sixth generation (6G) mobile communication system, and non-terrestrial network (NTN) system, non-3GPP communication system, etc.

[0131] The embodiments of the present application can be applied to homogeneous network scenarios, heterogeneous network scenarios, multi-point collaborative transmission scenarios (such as macro base stations and macro base stations, micro base stations and micro base stations, macro base stations and micro base stations), low-frequency (below 6G) scenarios, high-frequency (above 6G) scenarios, single transmission reception point (Single-TRP) scenarios, multi-TRP (Multi-TRP) scenarios, or any scenario derived from single TRP or multi-TRP, and other communication scenarios, without limitation.

[0132] The communication system provided in the embodiment of the present application is described below using FIG3 as an example.

[0133] Among them, the communication system provided by the embodiment of the present application may include one or more sending end devices and one or more receiving end devices.

[0134] For example, as shown in (a) of FIG3 , the transmitting device and the receiving device can be a network device and a terminal device, respectively, that is, the embodiment of the present application can be applied to the communication process between a network device and a terminal device, and can be applied to communication scenarios with network coverage. Alternatively, as shown in (b) or (c) of FIG3 , the transmitting device and the receiving device can also be different terminal devices, that is, the embodiment of the present application can be applied to the communication process between terminal devices, and the terminal device can be located within the coverage range of the network device or outside the coverage range of the network device, that is, it can be applied to communication scenarios with and without network coverage, without limitation.

[0135] The terminal device in Figure 3 can be a device with wireless transceiver functions or a chip or chip system that can be set in the device, which can allow the user to access the network and is a device for providing voice and / or data connectivity to the user. The terminal device can communicate with the network device through the Uu interface, or the terminal device can also communicate with the terminal device through the PC5 interface. The terminal device can also be called user equipment (UE), subscriber unit (subscriber unit), terminal (terminal), mobile station (MS), mobile terminal (MT), etc.

[0136] Exemplarily, the terminal device in FIG3 may be a mobile phone, a tablet computer, or a computer with wireless transceiver function. The terminal device may also be a user station, a mobile station, a remote station, a remote terminal device, a mobile terminal device, a user terminal device, a wireless communication device, a user agent, a user device, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device, a processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in the Internet of Things, a home appliance, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a wireless terminal in a smart home, a vehicle with vehicle-to-vehicle (V2V) communication capabilities, an in-vehicle communication module or other embedded communication module, an intelligent connected vehicle, a UAV to UAV (UAV to Unmanned aerial vehicles (UAVs, U2Us) with communication capabilities, terminal devices in future networks, or terminal devices in future evolved public land mobile networks (PLMNs), etc. are not restricted.

[0137] The network device in Figure 3 can be any device deployed in an access network that can communicate wirelessly with a terminal device. It can also be a chip or chip system that can be installed in the above-mentioned device. It can also be a logical node or logical module or a function implemented in software. It can be used to implement functions such as wireless physical control, resource scheduling and wireless resource management, wireless access control, and mobility management. Specifically, the network device can be a device that supports wired access or a device that supports wireless access.

[0138] Exemplarily, the network device may be composed of one or more access network (AN) / radio access network (RAN) nodes. The AN / RAN node may be: a base station (NB), a macro base station, a micro base station (or described as a small station), a pico base station, a balloon base station, a relay station, an enhanced nodeB (eNB), a next generation nodeB (gNB), a home base station (e.g., a home evolved NodeB, or a home NodeB, HNB), a base station in a 5G communication system, a base station in a future mobile communication system, an access point (AP) in a wireless-fidelity (WiFi) system, a TRP, a transmission point (TP), a transmission measurement function (TMF), a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a wearable device, an in-vehicle device, or some other access node, etc., without limitation.

[0139] In another example, in a distributed base station scenario, network equipment may include a baseband unit (BBU) and a remote radio unit (RRU). The BBU and RRU can be placed in different locations, for example: the RRU can be remotely located in a high-traffic area, while the BBU can be placed in a central equipment room. The BBU and RRU can also be placed in the same equipment room. The BBU and RRU can also be different components within the same rack.

[0140] In another example, in a cloud radio access network (CRAN) scenario, the network equipment may include a baseband pool (BBU pool) and an RRU.

[0141] In another example, the network device may also be a device including a centralized unit (CU) node, or a distributed unit (DU) node, or a CU node and a DU node. For example, the network device can be divided into CU and DU from a logical function perspective, with some protocol layer functions placed in the CU for centralized control, and the remaining part or all of the protocol layer functions distributed in the DU, which is centrally controlled by the CU. Furthermore, the centralized unit CU can also be divided into a control plane (CU-CP) and a user plane (CU-UP). In different systems, CU (including CU-CP or CU-UP) or DU may also have different names. For example, in an open radio access network (O-RAN) system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, and CU-UP may also be called O-CU-UP.

[0142] It should be noted that the transmitting device and the receiving device of the embodiments of the present application can be one or more chips, or a system on chip (SOC), etc. Figure 3 is only an exemplary figure, and the number of devices included is not limited. In addition, in addition to the devices shown in Figure 3, the communication system can also include other devices, such as wireless relay devices and wireless backhaul devices. The names of the various devices and the names of the various links in Figure 3 are not limited. In addition to the names shown in Figure 3, the various devices and the various links can also be named other names without limitation.

[0143] In a specific implementation, as shown in Figure 3 , each transmitting device and receiving device may adopt the structure shown in Figure 4 , or include the components shown in Figure 4 . Figure 4 is a schematic diagram of the structure of a communication device 400 provided in an embodiment of the present application. The communication device 400 may be a transmitting device or a chip or system-on-chip within the transmitting device; it may also be a receiving device or a chip or system-on-chip within the receiving device. As shown in Figure 4 , the communication device 400 includes a processor 401 , a transceiver 402 , and a communication circuit 403 .

[0144] Furthermore, the communication device 400 may further include a memory 404 . The processor 401 , the memory 404 and the transceiver 402 may be connected via a communication line 403 .

[0145] The processor 401 is a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 401 may also be other devices with processing functions, such as circuits, devices, or software modules, without limitation.

[0146] Transceiver 402 is used to communicate with other devices or other communication networks. Such other communication networks may be Ethernet, radio access networks (RAN), wireless local area networks (WLAN), etc. Transceiver 402 may be a module, circuit, transceiver, or any device capable of communication.

[0147] The communication line 403 is used to transmit information between the components included in the communication device 400.

[0148] The memory 404 is used to store instructions, where the instructions may be computer programs.

[0149] The memory 404 may be a read-only memory (ROM) or other type of static storage device that can store static information and / or instructions, or a random access memory (RAM) or other type of dynamic storage device that can store information and / or instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0150] It should be noted that memory 404 can exist independently of processor 401 or can be integrated with processor 401. Memory 404 can be used to store instructions, program code, or some data. Memory 404 can be located within communication device 400 or outside of communication device 400, without limitation. Processor 401 is configured to execute instructions stored in memory 404 to implement the reference signal transmission method provided in the following embodiments of this application.

[0151] In one example, the processor 401 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 4 .

[0152] As an optional implementation, the communication device 400 includes multiple processors. For example, in addition to the processor 401 in FIG. 4 , it may also include a processor 407 .

[0153] As an optional implementation, the communication apparatus 400 further includes an output device 405 and an input device 406. For example, the input device 406 is a keyboard, a mouse, a microphone, a joystick, or the like, and the output device 405 is a display screen, a speaker, or the like.

[0154] It should be noted that the communication device 400 may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device having a structure similar to that shown in FIG4 . Furthermore, the structure shown in FIG4 does not limit the communication device. In addition to the components shown in FIG4 , the communication device may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0155] In the embodiment of the present application, the chip system can be composed of chips, or can include chips and other discrete devices.

[0156] In addition, the actions, terms, etc. involved in the various embodiments of this application can refer to each other without limitation. The message names or parameter names in the messages exchanged between the various devices in the embodiments of this application are only examples, and other names can also be used in specific implementations without limitation.

[0157] In conjunction with the communication system shown in Figure 3, with reference to Figure 5 below, the reference signal transmission method provided in an embodiment of the present application is described, wherein the transmitting device may be a network device or a terminal device in the communication system shown in Figure 3, and the receiving device may be a terminal device in the communication system shown in Figure 2. The transmitting device and the receiving device described in the following embodiments may both have the components shown in Figure 4. The processing performed by a single execution subject (transmitting device or receiving device) shown in the embodiment of the present application may also be divided into executions by multiple execution subjects, and these execution subjects may be logically and / or physically separated without restriction.

[0158] FIG5 is a flowchart of a reference signal transmission method provided in an embodiment of the present application. As shown in FIG5 , the method may include:

[0159] Step 501: The transmitting end device determines a frequency domain resource mapping relationship of a reference signal according to a frequency domain channel matrix associated with an antenna port and a frequency domain sampling number of the reference signal associated with the antenna port.

[0160] The frequency domain resource mapping relationship of the reference signal may be used to indicate a subcarrier associated with each of one or more frequency domain resources associated with the reference signal.

[0161] Optionally, the transmitting device can determine the frequency domain resource mapping relationship interval of the reference signal based on the frequency domain channel matrix and the frequency domain sampling number of the reference signal; determine the frequency domain resource mapping relationship of the reference signal based on the frequency domain resource mapping relationship interval of the reference signal and the frequency domain sampling number of the reference signal.

[0162] The frequency domain channel matrix may be used to indicate a user channel of frequency domain information, and the frequency domain sampling number may also be other parameters that may be used to indicate the frequency domain sampling number, etc., without limitation.

[0163] Among them, the description of the frequency domain resource mapping relationship interval of the reference signal can refer to the relevant description in Figures 6 to 8 below, and will not be repeated here.

[0164] Optionally, the transmitting device may perform singular value decomposition on the frequency domain channel matrix to obtain a singular value decomposition result, and determine the number of frequency domain samples of the reference signal according to the singular value decomposition result.

[0165] Optionally, the transmitting device may also adopt any one or more of the methods shown in the following Figures 9 to 17 to determine the frequency domain resource mapping relationship of the reference signal, which will not be described in detail here.

[0166] Step 502: The transmitting device sends first information to the receiving device. Correspondingly, the receiving device receives the first information from the transmitting device.

[0167] The first information may be used to indicate a frequency domain resource mapping relationship of a reference signal associated with an antenna port.

[0168] Optionally, the receiving device may adopt any one or more of the methods shown in the following Figures 9 to 17 to determine the frequency domain resource mapping relationship of the reference signal according to the first information, which is not described in detail here.

[0169] Optionally, the sending device can carry the first information in one or more of the following signaling and send it to the receiving device: downlink control information (DCI), media access control control element (MAC CE), radio resource control (RRC) signaling, etc., without restriction.

[0170] Step 503: The transmitting end device transmits the reference signal according to the frequency domain resource mapping relationship of the reference signal; correspondingly, the receiving end device receives the reference signal according to the frequency domain resource mapping relationship of the reference signal.

[0171] Optionally, the receiving device may perform channel estimation based on the received reference signal.

[0172] Alternatively, the above step 503 may be replaced by the following step 504.

[0173] Step 504: The receiving end device sends the reference signal according to the frequency domain resource mapping relationship of the reference signal; correspondingly, the transmitting end device receives the reference signal according to the frequency domain resource mapping relationship of the reference signal.

[0174] Optionally, the transmitting device may perform channel estimation based on the received reference signal.

[0175] Based on the method shown in Figure 5 above, the transmitting device can dynamically determine the frequency domain resource mapping relationship of the reference signal according to the frequency domain channel matrix associated with the antenna port and the frequency domain sampling number of the reference signal associated with the antenna port, and dynamically switch the frequency domain resource mapping relationship of the reference signal through the first information, so that on the basis of increasing the antenna port, it can dynamically obtain a better frequency domain sampling position, improve the accuracy of channel estimation, and improve communication performance.

[0176] Based on the method shown in FIG5 , the frequency domain resource mapping relationship interval of the reference signal is described in detail with reference to FIG6 below.

[0177] FIG6 is a flowchart of determining a frequency domain resource mapping relationship interval of a reference signal according to an embodiment of the present application. As shown in FIG6 , the method may include:

[0178] Step 601: A transmitting end device determines a rank and a first value of a frequency domain channel matrix according to the frequency domain channel matrix.

[0179] The dimension of the frequency domain channel matrix may be the number of receiving antennas*the number of frequency domain resources.

[0180] Among them, the first value can be the number of singular values ​​in the singular value decomposition result of the frequency domain channel matrix that meet the first condition, and the first condition can be that the difference between the reconstructed matrix corresponding to the singular value and the frequency domain channel matrix is ​​less than or equal to the first threshold.

[0181] Step 602: The transmitting end device determines a frequency domain resource mapping relationship interval of the reference signal according to the rank of the frequency domain channel matrix, the first value, and the number of frequency domain samples of the reference signal.

[0182] For example, as shown in Figure 7, when the frequency domain sampling number of the reference signal is less than or equal to the first value, the frequency domain resource mapping relationship interval of the reference signal may be the first frequency domain resource mapping relationship interval; or, when the frequency domain sampling number of the reference signal is greater than the first value and less than or equal to the rank of the frequency domain channel matrix, the frequency domain resource mapping relationship interval of the reference signal may be the second frequency domain resource mapping relationship interval; or, when the frequency domain sampling number of the reference signal is greater than the rank of the frequency domain channel matrix, the frequency domain resource mapping relationship interval of the reference signal may be the third frequency domain resource mapping relationship interval.

[0183] Optionally, the transmitting device may also refer to step 603 below to send first indication information to the receiving device.

[0184] 603. The transmitting device sends first indication information to the receiving device; correspondingly, the receiving device receives the first indication information from the transmitting device.

[0185] Step 604: The receiving end device determines the frequency domain resource mapping relationship interval of the reference signal according to the first indication information.

[0186] The first indication information may be used to indicate a frequency domain resource mapping relationship interval of a reference signal.

[0187] In a first possible design, the first indication information may include the rank of the frequency domain channel matrix, a first numerical value, and the number of frequency domain samples of the reference signal; wherein the first numerical value is the number of singular values ​​in the singular value decomposition result of the frequency domain channel matrix that meet the first condition, and the first condition is that the difference between the reconstructed matrix corresponding to the singular value and the frequency domain channel matrix is ​​less than or equal to the first threshold.

[0188] The receiving end device may determine the frequency domain resource mapping relationship interval of the reference signal according to the first indication information and with reference to the description shown in FIG. 7 .

[0189] Optionally, the transmitting device can carry the rank of the frequency domain channel matrix, the first value, and the frequency domain sampling number of the reference signal in the same first indication information and send it to the receiving device. Alternatively, as shown in Figure 8, the transmitting device can also carry the rank and the first value of the frequency domain channel matrix in the first indication information 1, and carry the frequency domain sampling number of the reference signal in the first indication information 2 and send it to the receiving device without restriction. Then, the receiving device can determine the frequency domain resource mapping relationship interval of the reference signal based on the first indication information 1 and the first indication information 2, determine the frequency domain resource mapping relationship of the reference signal based on the frequency domain resource mapping relationship interval of the reference signal, and then perform channel estimation based on the reference signal received based on the frequency domain resource mapping relationship of the reference signal.

[0190] Optionally, the first indication information 1 and the first indication information 2 may have periods of different lengths or periods of the same length, without limitation.

[0191] In a second possible design, the first indication information may include an interval index of a frequency domain resource mapping relationship interval of a reference signal.

[0192] The receiving end device may determine, based on the received first indication information, from a preset mapping relationship, a frequency domain resource mapping relationship interval corresponding to the interval index indicated by the first indication information.

[0193] The preset mapping relationship may be used to indicate the interval index and the frequency domain resource mapping relationship interval corresponding to the interval index.

[0194] Exemplarily, the preset mapping relationship can be used to indicate that the interval index 00 corresponds to the first frequency domain resource mapping relationship interval, the interval index 01 corresponds to the second frequency domain resource mapping relationship interval, and the interval index 10 corresponds to the third frequency domain resource mapping relationship interval.

[0195] Optionally, the preset mapping relationship may be predefined by a communication protocol. Alternatively, the preset mapping relationship may be determined by a transmitting device, and the transmitting device may send the preset mapping relationship determined by itself to the receiving device.

[0196] In a third possible design, the first indication information includes interval frequency domain range information of the frequency domain resource mapping relationship interval of the reference signal.

[0197] Exemplarily, the interval frequency domain range information may include a frequency domain minimum value and a frequency domain maximum value of the frequency domain resource mapping relationship interval.

[0198] In a fourth possible design, the first indication information includes interval position information of the frequency domain resource mapping relationship interval of the reference signal.

[0199] Exemplarily, the interval position information can be the absolute position information of the frequency domain resource mapping relationship interval (such as the position information of the frequency domain resource mapping relationship interval in the frequency domain), or the interval position information can also be the relative position information of the frequency domain resource mapping relationship interval (such as the position information of the frequency domain resource mapping relationship interval relative to the starting position of a certain frequency domain range), etc., without limitation.

[0200] Optionally, the above four possible designs can be used independently or in combination without limitation.

[0201] Based on the above description of the first indication information, optionally, the transmitting device can carry the first indication information in one or more of the following signaling and send it to the receiving device: DCI, MAC CE, RRC signaling, etc., without limitation.

[0202] Based on the above description, with reference to the following FIG. 9 to FIG. 17 , a detailed description is given of the frequency domain resource mapping relationship for determining the reference signal between the transmitting device and the receiving device.

[0203] FIG9 is a schematic diagram of a method for determining a frequency domain resource mapping relationship of a reference signal provided by an embodiment of the present application. As shown in FIG9 , the method may include:

[0204] Step 901: The sending end device determines a pseudo-random sequence based on a random number seed.

[0205] The method for generating a pseudo-random sequence based on a random number seed may be predefined by the protocol. Alternatively, the method may be determined independently by the transmitting device. Optionally, as shown in FIG10 , the transmitting device may further indicate the generation method to the receiving device via second indication information, so that the receiving device generates the same pseudo-random sequence as the transmitting device based on the generation method and the random number seed indicated by the transmitting device.

[0206] Step 902: The transmitting end device determines a subcarrier associated with each of one or more frequency domain resources associated with the reference signal according to the pseudo-random sequence and the number of frequency domain samples of the reference signal.

[0207] Step 903: The transmitting end device determines the frequency domain resource mapping relationship according to the position of the subcarrier associated with the reference signal in the frequency domain resource mapping relationship interval of the reference signal.

[0208] Exemplarily, the transmitting end device may refer to the following formula (1) to perform singular value decomposition on the frequency domain channel matrix of the antenna port, refer to the following formula (2) to determine the frequency domain sampling number r and the projection matrix V of the reference signal, and then refer to the following pseudo code to form a matrix P corresponding to the frequency domain resource mapping relationship according to the pseudo-random sequence. The matrix P can be generated by the main column vector of the projection matrix:

[0209] Among them, H i represents the frequency domain channel matrix of the i-th antenna port; nrx represents the number of antenna ports at the receiving end; nsc represents the number of frequency domain subcarriers; SVD represents singular value decomposition; U represents the matrix composed of the left singular vectors of the singular value decomposition; ∑ represents the diagonal matrix composed of the singular values ​​of the singular value decomposition; V′ H represents the transpose of V′; V′ represents the matrix consisting of the right singular vectors of the singular value decomposition.

[0210] Wherein, r represents the number of frequency domain samples of the reference signal, or can also be described as r represents the number of frequency domain resources associated with the reference signal; k represents the index of the row element or column element in the matrix ∑; T represents the transpose of the matrix; Truncate represents truncation.

[0211] pseudocode:

[0212] random_state_configure(random_seed,random_method); #Configure the initial random state using random seed random_seed and random sequence generation method random_method;

[0213] idx = random_permutation(1:nsc,r); #Randomly select r numbers from nsc numbers from 1 to nsc;

[0214] P = eye(nsc); #Generate an identity matrix with dimensions of nsc rows and nsc columns;

[0215] P=P(:,idx); #Select the column vector specified by idx from the matrix P;

[0216] Where your_seed represents the random number seed, and the matrix P is an nsc*r matrix.

[0217] Based on the method shown in FIG. 9 , when the transmitting device sends the first information to the receiving device, as shown in FIG. 10 , the random number seed may be carried in the first information.

[0218] Optionally, the first information may further include the number of frequency domain samples of the reference signal. Alternatively, the number of frequency domain samples of the reference signal may be indicated by the transmitting device to the receiving device through other information, which is not limited.

[0219] Optionally, the first information can also be used to indicate that the frequency domain resource mapping relationship interval of the reference signal is a third frequency domain resource mapping relationship interval. Or it can be described as when the frequency domain resource mapping relationship interval is the third frequency domain resource mapping relationship interval, the frequency domain resource mapping relationship is represented by a random number seed and the frequency domain sampling number of the reference signal. The frequency domain resource mapping relationship can be used to indicate the position of the subcarrier associated with the reference signal in the third frequency domain resource mapping relationship interval. When the receiving device receives the first information including the random number seed, the receiving device can determine that the frequency domain resource mapping relationship interval of the reference signal is the third frequency domain resource mapping relationship interval.

[0220] Among them, the third frequency domain resource mapping relationship interval can be area 3 as shown in (c) in Figure 11, where the frequency domain density is higher (that is, the number of frequency domain samples is larger) and the resource position of the reference signal is less sensitive. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the third frequency domain resource mapping relationship interval), the frequency domain resource mapping relationship can be indicated by using a random number seed and the frequency domain sampling number of the reference signal.

[0221] Among them, in Figure 11, three sub-graphs can be used to respectively represent the probability of the frequency domain resource mapping relationship of different antenna ports selecting a specific frequency domain position within the three frequency domain resource mapping relationship intervals. As shown in (a) in Figure 11, the figure shows the probability of the frequency domain resource mapping relationship of different antenna ports selecting a specific frequency domain position when the number of frequency domain samples of a given reference signal is equal to 3 subcarriers. This is a typical case of the frequency domain resource mapping relationship within the first frequency domain resource mapping relationship interval. It can be seen from the figure that, except for the starting subcarrier position and the ending subcarrier position, the selection probability at the remaining subcarrier positions is small, the positions with a selection probability equal to 0 are more, and the positions with non-zero selection probabilities do not have obvious regularity. As shown in Figure 11(b), the figure shows the probability of selecting a specific frequency domain location for the frequency domain resource mapping relationship of different antenna ports when the frequency domain sampling number of a given reference signal is equal to 11 subcarriers. This is a typical case of the frequency domain resource mapping relationship within the second frequency domain resource mapping relationship interval. As can be seen from the figure, except for the starting and ending subcarrier positions, where the selection probabilities are close to 1, the selection probabilities at specific subcarrier positions are also close to or equal to 1, and there is a significant regularity in the positions with non-zero selection probabilities. As shown in Figure 11(c), the figure shows the probability of selecting a specific frequency domain location for the frequency domain resource mapping relationship of different antenna ports when the frequency domain sampling number of a given reference signal is equal to 19 subcarriers. This is a typical case of the frequency domain resource mapping relationship within the third frequency domain resource mapping relationship interval. As can be seen from the figure, except for the starting and ending subcarrier positions, where the selection probabilities are close to 1, the selection probabilities at the remaining subcarrier positions are small, the positions where the selection probabilities are equal to 0 are relatively few, and there is no obvious regularity in the positions with non-zero selection probabilities.

[0222] Optionally, different from the above-mentioned sending end device implicitly indicating that the frequency domain resource mapping relationship interval of the reference signal is the third frequency domain resource mapping relationship interval through the first information, as shown in Figure 10, the sending end device can also indicate the frequency domain resource mapping relationship interval of the reference signal through the first indication information without restriction.

[0223] Optionally, the first information, first indication information, and second indication information may have periods of different lengths, or periods of the same length, without limitation.

[0224] Based on the above description of the random number seed and the frequency domain sampling number of the reference signal, the receiving device can also refer to the method shown in Figure 9 above to determine the frequency domain resource mapping relationship of the reference signal according to the random number seed and the frequency domain sampling number of the reference signal.

[0225] Exemplarily, the receiving device can determine a pseudo-random sequence based on a random number seed; determine the subcarrier associated with each of one or more frequency domain resources associated with the reference signal based on the pseudo-random sequence and the number of frequency domain samples of the reference signal; and determine the frequency domain resource mapping relationship of the reference signal based on the position of the subcarrier associated with the reference signal in the third frequency domain resource mapping relationship interval. Furthermore, as shown in Figure 10, the receiving device can receive the reference signal from the transmitting device based on the frequency domain resource mapping relationship of the reference signal and perform channel estimation based on the reference signal.

[0226] Unlike the above-mentioned Figures 9 to 10, in which the transmitting device determines and indicates the frequency domain resource mapping relationship of the reference signal based on the random number seed and the frequency domain sampling number of the reference signal, referring to the following Figures 12 to 14, the transmitting device can also determine and indicate the frequency domain resource mapping relationship of the reference signal based on the frequency domain sampling sequence.

[0227] FIG12 is a schematic diagram of a method for determining a frequency domain resource mapping relationship of a reference signal provided by an embodiment of the present application. As shown in FIG12 , the method may include:

[0228] Step 1201: The transmitting end device performs singular value decomposition on the frequency domain channel matrix to obtain a singular value decomposition result.

[0229] Exemplarily, the transmitting end device may perform singular value decomposition on the frequency domain channel matrix with reference to formula (1) in FIG9 to obtain a singular value decomposition result.

[0230] Step 1202: The transmitting device determines a projection matrix according to the singular value decomposition result.

[0231] The number of rows of the projection matrix is ​​equal to the number of frequency domain resources associated with the reference signal, and the number of columns of the projection matrix is ​​equal to the number of frequency domain subcarriers.

[0232] Exemplarily, the transmitting end device may refer to formula (2) in FIG. 9 and determine the projection matrix according to the singular value decomposition result.

[0233] Step 1203: The transmitting device determines a frequency domain sampling sequence according to the projection matrix.

[0234] The frequency domain resource mapping relationship corresponding to the frequency domain sampling sequence can be a regular sequence (the frequency domain position indexes selected by the frequency domain resource mapping relationship shown in (b) of FIG11 are symmetrical, and the starting and ending frequency domain positions can be selected with a high probability), a non-uniform sequence (such as a larger interval in the middle and a smaller interval at both ends), or a sparse sequence (such as a sparse matrix, or a corresponding sparsity factor or sparsity degree less than or equal to a preset threshold, etc.). Alternatively, the frequency domain sampling sequence can also be a low-density sequence with equal intervals.

[0235] Among them, the frequency domain position index selected by the frequency domain resource mapping relationship is symmetrical, which can mean that the sequence composed of multiple frequency domain position indexes selected by the frequency domain resource mapping relationship is flipped left and right, and the flipped sequence is added to the original sequence. If the added sequence is a symmetrical sequence, then the frequency domain position index selected by the frequency domain resource mapping relationship is considered to be symmetrical.

[0236] For example, as shown in (b) in Figure 11, taking the sequence composed of multiple frequency domain position indices selected by the frequency domain resource mapping relationship as [1, 6, 17, 33, 52, 72, 93, 112, 128, 139, 144] as an example, the sequence can be flipped left and right to obtain the flipped sequence [144, 139, 128, 112, 93, 72, 52, 33, 17, 6, 1], and the flipped sequence and the original sequence are added to obtain the added sequence [145, 145, 145, 145, 145, 144, 145, 145, 145, 145, 145], which is a symmetric sequence, indicating that the frequency domain position indices selected by the frequency domain resource mapping relationship shown in (b) in Figure 11 are symmetric.

[0237] The higher probability of being selected may mean that when the frequency domain position index is equal to 1 and 144, the selection probability of the frequency domain resource mapping relationship is close to 1.

[0238] For example, the transmitting end device may refer to the following formula (3), based on QR decomposition, determine the matrix P corresponding to the frequency domain resource mapping relationship according to the projection matrix, and indicate the matrix P in the form of a frequency domain sampling sequence. The matrix P can be generated by the main column vector of the projection matrix: V H ·P T =Q·R Formula (3)

[0239] Among them, P T represents the permutation matrix after matrix transposition (wherein the elements are 0 or 1, and the position of 1 represents the frequency domain position selected by the frequency domain resource mapping relationship); Q represents the Q matrix after QR decomposition, and R represents the R matrix after QR decomposition.

[0240] For example, taking the frequency domain range of the reference signal as 36 subcarriers, as shown in Figure 13, the three columns from left to right represent: the frequency domain sampling sequence when the frequency domain sampling number of the reference signal is 8, the frequency domain sampling sequence when the frequency domain sampling number of the reference signal is 9, and the frequency domain sampling sequence when the frequency domain sampling number of the reference signal is 10.

[0241] Optionally, the specific value of the frequency domain sampling sequence may be related to the PRB Bundling size and the number of frequency domain sampling resources of the antenna port, and is not limited.

[0242] Optionally, the specific value of the frequency domain sampling sequence is not affected by factors such as the number of multi-user (MU) pairings and the number of antennas of the terminal device.

[0243] Step 1204: The transmitting end device determines a frequency domain sampling sequence index corresponding to the frequency domain sampling sequence according to the frequency domain sampling sequence.

[0244] When the transmitting device sends the first information to the receiving device, as shown in FIG14 , the frequency domain sampling sequence index may be included in the first information. The receiving device may determine, based on the received first information, the frequency domain sampling sequence corresponding to the frequency domain sampling sequence index from a preset correspondence. Compared to sending the frequency domain sampling sequence, sending the frequency domain sampling sequence index can reduce signaling overhead.

[0245] The preset corresponding relationship may be used to indicate a frequency domain sampling sequence index and a frequency domain sampling sequence corresponding to the frequency domain sampling sequence index.

[0246] Exemplarily, the preset correspondence may be used to indicate that the frequency domain sampling sequence index 00 corresponds to the first frequency domain sampling sequence, the frequency domain sampling sequence index 01 corresponds to the second frequency domain sampling sequence, and the frequency domain sampling sequence index 10 corresponds to the third frequency domain sampling sequence.

[0247] Optionally, the preset corresponding relationship may be predefined by a communication protocol. Alternatively, as shown in FIG14 , the preset corresponding relationship may be sent by the transmitting device to the receiving device via third indication information.

[0248] Optionally, the first information can also be used to indicate that the frequency domain resource mapping relationship interval of the reference signal is the second frequency domain resource mapping relationship interval. Or it can be described as when the frequency domain resource mapping relationship interval is the second frequency domain resource mapping relationship interval, the frequency domain resource mapping relationship is represented as a frequency domain sampling sequence index. The frequency domain resource mapping relationship can be used to indicate the position of the subcarrier associated with the reference signal in the second frequency domain resource mapping relationship interval. When the receiving device receives the first information including the frequency domain sampling sequence index, the receiving device can determine that the frequency domain resource mapping relationship interval of the reference signal is the second frequency domain resource mapping relationship interval.

[0249] Among them, the second frequency domain resource mapping relationship interval can be area 2 as shown in (b) in Figure 11, where the number of frequency domain samples is equivalent to the rank or first value of the frequency domain channel matrix. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the second frequency domain resource mapping relationship interval), the frequency domain resource mapping relationship can be indicated by means of frequency domain sampling sequence index.

[0250] Optionally, different from the above-mentioned sending end device implicitly indicating that the frequency domain resource mapping relationship interval of the reference signal is the second frequency domain resource mapping relationship interval through the first information, as shown in Figure 14, the sending end device can also indicate the frequency domain resource mapping relationship interval of the reference signal through the first indication information without restriction.

[0251] Optionally, the first information, first indication information, and third indication information may have periods of different lengths, or periods of the same length, without limitation.

[0252] Based on the above description of the frequency domain sampling sequence index, the receiving device can determine the frequency domain sampling sequence associated with the frequency domain sampling sequence index from a preset correspondence based on the frequency domain sampling sequence index; determine the subcarrier associated with each of the one or more frequency domain resources associated with the reference signal based on the frequency domain sampling sequence; and determine the frequency domain resource mapping relationship based on the position of the subcarrier associated with the reference signal in the second frequency domain resource mapping relationship interval. Furthermore, as shown in Figure 14, the receiving device can receive the reference signal from the transmitting device based on the frequency domain resource mapping relationship of the reference signal and perform channel estimation based on the reference signal.

[0253] Unlike the above-mentioned Figures 12 to 14, in which the transmitting device determines and indicates the frequency domain resource mapping relationship of the reference signal based on the frequency domain sampling sequence, referring to the following Figures 15 to 17, the transmitting device can also determine and indicate the frequency domain resource mapping relationship of the reference signal based on the bit map.

[0254] FIG15 is a schematic diagram of a method for determining a frequency domain resource mapping relationship of a reference signal provided by an embodiment of the present application. As shown in FIG15 , the method may include:

[0255] Step 1501: The transmitting end device performs singular value decomposition on the frequency domain channel matrix to obtain a singular value decomposition result.

[0256] Step 1502: The transmitting device determines a projection matrix according to the singular value decomposition result.

[0257] The number of rows of the projection matrix is ​​equal to the number of frequency domain resources associated with the reference signal, and the number of columns of the projection matrix is ​​equal to the number of frequency domain subcarriers.

[0258] The description of step 1501 and step 1502 may refer to the above description of step 1201 and step 1202 and will not be repeated here.

[0259] Step 1503: The transmitting device determines a bitmap according to the projection matrix.

[0260] The bitmap is used to indicate the subcarrier associated with each frequency domain resource in one or more frequency domain resources associated with the reference signal.

[0261] For example, as shown in FIG16 , taking the number of frequency domain subcarriers nsc as 432 and the number of frequency domain samples r as 8 as an example, the transmitting end device can decompose V based on QR, referring to formula (3) H ·P T =Q·R, determine the matrix P corresponding to the frequency domain resource mapping relationship according to the projection matrix V, and indicate the matrix P in a bitmap manner, wherein the matrix P can be generated by the main column vectors of the projection matrix.

[0262] The elements of the matrix P can be 0 or 1, 0 means unoccupied and 1 means occupied. The bitmap can be expressed as

[0263] Optionally, when the transmitting device sends the first information to the receiving device, the bitmap may be included in the first information, as shown in Figure 17. The receiving device may determine the frequency domain resource mapping relationship based on the bitmap in the received first information.

[0264] Optionally, the first information can also be used to indicate that the frequency domain resource mapping relationship interval of the reference signal is the first frequency domain resource mapping relationship interval. Or it can be described as when the frequency domain resource mapping relationship interval is the first frequency domain resource mapping relationship interval, the frequency domain resource mapping relationship is represented as a bit map. The frequency domain resource mapping relationship can be used to indicate the position of the subcarrier associated with the reference signal in the first frequency domain resource mapping relationship interval. When the receiving device receives the first information including the bit map, the receiving device can determine that the frequency domain resource mapping relationship interval of the reference signal is the first frequency domain resource mapping relationship interval.

[0265] Among them, the first frequency domain resource mapping relationship interval can be area 1 as shown in (a) in Figure 11, where the frequency domain density is very low and the resource position of the reference signal is very sensitive. For frequency domain resource mapping relationship intervals with this feature (including but not limited to the first frequency domain resource mapping relationship interval), the frequency domain resource mapping relationship can be indicated in the form of a bit map.

[0266] Optionally, different from the above-mentioned sending end device implicitly indicating that the frequency domain resource mapping relationship interval of the reference signal is the first frequency domain resource mapping relationship interval through the first information, as shown in Figure 17, the sending end device can also indicate the frequency domain resource mapping relationship interval of the reference signal through the first indication information without restriction.

[0267] Optionally, the first information and the first indication information may have periods of different lengths, or periods of the same length, without limitation.

[0268] Optionally, based on the description of Figures 5 to 17 above, the transmitting device may further send fourth indication information to the receiving device. For example, as shown in Figures 10, 14, or 17, the transmitting device may send fourth indication information to the receiving device.

[0269] The fourth indication information is used to indicate an interpolation matrix, and the interpolation matrix is ​​used to assist the receiving end device in performing channel estimation to improve system spectrum efficiency.

[0270] For example, the transmitting end device may determine the interpolation matrix according to the matrix P corresponding to the frequency domain resource mapping relationship by referring to the following formula:

[0271] Optionally, the transmitting device may quantize the interpolation matrix, carry the quantization result in the fourth indication information and send it to the receiving device to reduce signaling overhead.

[0272] Optionally, the first information, the first indication information, the second indication information, the third indication information, and the fourth indication information may have periods of different lengths or periods of the same length, without limitation.

[0273] It should be noted that the various embodiments of this application can be implemented independently or in combination, without limitation. Unless otherwise specified or there is a logical conflict, the terms and / or descriptions of the different embodiments provided in this application are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0274] It is understood that in the embodiments of the present application, the execution subject may perform some or all of the steps in the embodiments of the present application. These steps or operations are merely examples, and the embodiments of the present application may also perform other operations or variations of various operations. In addition, the various steps may be performed in a different order than those presented in the embodiments of the present application, and it is possible that not all operations in the embodiments of the present application need to be performed.

[0275] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between devices. It is understandable that, in order to implement the above functions, each device includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily appreciate that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0276] The embodiments of the present application can divide the functional modules of each device according to the above method examples. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods.

[0277] In the case of dividing each functional module according to each function, Figure 18 shows a communication device 180, which can execute the actions performed by the sending end device or the receiving end device in the methods shown in Figures 5 to 17 above. All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module. The technical effects that can be obtained can be referred to the above method embodiment and will not be repeated here.

[0278] The communication device 180 may include a transceiver module 1801 and a processing module 1802. Exemplarily, the communication device 180 may be a communication device, or a chip used in a communication device, or other combined device or component having the aforementioned communication device functionality. When the communication device 180 is a communication device, the transceiver module 1801 may be a transceiver, which may include an antenna and radio frequency circuits, etc.; the processing module 1802 may be a processor (or processing circuit), such as a baseband processor, which may include one or more CPUs. When the communication device 180 is a component having the aforementioned communication device functionality, the transceiver module 1801 may be a radio frequency unit; the processing module 1802 may be a processor (or processing circuit), such as a baseband processor. When the communication device 180 is a system-on-chip (SoC), the transceiver module 1801 may be the input / output interface of the SoC (e.g., a baseband chip); the processing module 1802 may be the SoC's processor (or processing circuit), which may include one or more central processing units. It should be understood that the transceiver module 1801 in the embodiment of the present application can be implemented by a transceiver or a transceiver-related circuit component; the processing module 1802 can be implemented by a processor or a processor-related circuit component (or, referred to as a processing circuit).

[0279] For example, the transceiver module 1801 can be used to perform all transceiver operations performed by the communication device in the embodiments shown in Figures 5 to 17, and / or to support other processes of the technology described herein; the processing module 1802 can be used to perform all operations other than transceiver operations performed by the communication device in the embodiments shown in Figures 5 to 17, and / or to support other processes of the technology described herein.

[0280] As another possible implementation, the transceiver module 1801 in FIG18 can be replaced by a transceiver that integrates the functionality of the transceiver module 1801; the processing module 1802 can be replaced by a processor that integrates the functionality of the processing module 1802. Furthermore, the communication device 180 shown in FIG18 can also include a memory.

[0281] Alternatively, when the processing module 1802 is replaced by a processor and the transceiver module 1801 is replaced by a transceiver, the communication device 180 involved in the embodiment of the present application may also be the communication device 190 shown in Figure 19, wherein the processor may be the logic circuit 1901 and the transceiver may be the interface circuit 1902. Furthermore, the communication device 190 shown in Figure 19 may also include a memory 1903.

[0282] The embodiments of the present application also provide a computer program product, which, when executed by a computer, can implement the functions of any of the above method embodiments.

[0283] The embodiments of the present application also provide a computer program, which, when executed by a computer, can implement the functions of any of the above method embodiments.

[0284] The embodiment of the present application also provides a computer-readable storage medium. All or part of the processes in the above-mentioned method embodiments can be completed by a computer program to instruct the relevant hardware, and the program can be stored in the above-mentioned computer-readable storage medium. When the program is executed, it can include the processes of the above-mentioned method embodiments. The computer-readable storage medium can be an internal storage unit of the terminal (including the data sending end and / or the data receiving end) of any of the above-mentioned embodiments, such as the hard disk or memory of the terminal. The above-mentioned computer-readable storage medium can also be an external storage device of the above-mentioned terminal, such as a plug-in hard disk equipped on the above-mentioned terminal, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. Further, the above-mentioned computer-readable storage medium can also include both the internal storage unit of the above-mentioned terminal and an external storage device. The above-mentioned computer-readable storage medium is used to store the above-mentioned computer program and other programs and data required by the above-mentioned terminal. The above-mentioned computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0285] It should be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. "First" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this embodiment, unless otherwise specified, "multiple" means two or more.

[0286] Furthermore, the terms "include," "comprise," and "have," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0287] It should be understood that in this application, "at least one (item)" refers to one or more. "Multiple" refers to two or more. "At least two (items)" refers to two or three and more than three. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple. “When” and “if” both mean that corresponding measures will be taken under certain objective circumstances. They do not limit the time, nor do they require any judgment action when they are implemented, nor do they mean that there are other limitations.

[0288] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner to facilitate understanding.

[0289] In this application, "sending information to ... (a terminal device)" can be understood as the destination of the information being the terminal device. This can include sending information directly or indirectly to the terminal device. "Receiving information from ... (a terminal device)" can be understood as the source of the information being the terminal device. This can include receiving information directly or indirectly from the terminal device. The information may undergo necessary processing between the source and destination, such as formatting changes, but the destination can still understand the valid information from the source.

[0290] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0291] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0292] The units described as separate components may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0293] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0294] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

Claims

1. A method for transmitting a reference signal, characterized in that Including: Determine the frequency-domain resource mapping relationship of the reference signal according to the frequency-domain channel matrix associated with the antenna port and the number of frequency-domain samples of the reference signal associated with the antenna port; Send first information to the receiving-end device; wherein, the first information is used to indicate the frequency-domain resource mapping relationship of the reference signal; Send or receive the reference signal according to the frequency-domain resource mapping relationship of the reference signal.

2. The method according to claim 1, wherein The determining the frequency-domain resource mapping relationship of the reference signal according to the frequency-domain channel matrix associated with the antenna port and the number of frequency-domain samples of the reference signal associated with the antenna port includes: Determine the interval of the frequency-domain resource mapping relationship of the reference signal according to the frequency-domain channel matrix and the number of frequency-domain samples of the reference signal; Determine the frequency-domain resource mapping relationship of the reference signal according to the interval of the frequency-domain resource mapping relationship of the reference signal and the number of frequency-domain samples of the reference signal.

3. The method according to claim 2, characterized in that, The determining the interval of the frequency-domain resource mapping relationship of the reference signal according to the frequency-domain channel matrix and the number of frequency-domain samples of the reference signal includes: Determine the rank and a first value of the frequency-domain channel matrix according to the frequency-domain channel matrix; wherein, the first value is the number of singular values satisfying a first condition in the singular value decomposition result of the frequency-domain channel matrix, and the first condition is that the difference between the reconstruction matrix corresponding to the singular value and the frequency-domain channel matrix is less than or equal to a first threshold; Determine the interval of the frequency-domain resource mapping relationship of the reference signal according to the rank of the frequency-domain channel matrix, the first value, and the number of frequency-domain samples of the reference signal.

4. The method according to claim 3, wherein when the number of frequency-domain samples of the reference signal is less than or equal to the first value, the interval of the frequency-domain resource mapping relationship of the reference signal is a first frequency-domain resource mapping relationship interval; or when the number of frequency-domain samples of the reference signal is greater than the first value and less than or equal to the rank of the frequency-domain channel matrix, the interval of the frequency-domain resource mapping relationship of the reference signal is a second frequency-domain resource mapping relationship interval; or when the number of frequency-domain samples of the reference signal is greater than the rank of the frequency-domain channel matrix, the interval of the frequency-domain resource mapping relationship of the reference signal is a third frequency-domain resource mapping relationship interval.

5. The method according to any one of claims 2-4, characterized in that, The method further includes: Send first indication information to the receiving-end device; wherein, the first indication information is used to indicate the interval of the frequency-domain resource mapping relationship of the reference signal.

6. The method according to claim 5, wherein the first indication information includes the rank of the frequency-domain channel matrix, the first value, and the number of frequency-domain samples of the reference signal; wherein, the first value is the number of singular values satisfying a first condition in the singular value decomposition result of the frequency-domain channel matrix, and the first condition is that the difference between the reconstruction matrix corresponding to the singular value and the frequency-domain channel matrix is less than or equal to a first threshold; or the first indication information includes the interval index of the interval of the frequency-domain resource mapping relationship of the reference signal; or the first indication information includes the interval frequency-domain range information of the interval of the frequency-domain resource mapping relationship of the reference signal; The first indication information includes interval position information of an interval of a frequency-domain resource mapping relationship of the reference signal.

7. The method according to any one of claims 1-6, characterized in that, The method further includes: Performing singular value decomposition on the frequency-domain channel matrix to obtain a singular value decomposition result; Determining a frequency-domain sampling number of the reference signal according to the singular value decomposition result.

8. The method according to any one of claims 1 to 7, characterized in that, The determining of the frequency-domain resource mapping relationship of the reference signal according to the frequency-domain channel matrix associated with the antenna port and the frequency-domain sampling number of the reference signal associated with the antenna port includes: Determining a pseudo-random sequence according to a random number seed; Determining sub-carriers associated with each of one or more frequency-domain resources associated with the reference signal according to the pseudo-random sequence and the frequency-domain sampling number of the reference signal; Determining the frequency-domain resource mapping relationship according to positions of the sub-carriers associated with the reference signal in an interval of the frequency-domain resource mapping relationship of the reference signal.

9. The method according to claim 8, wherein the first information includes the random number seed.

10. The method according to claim 9, wherein the first information further includes the frequency-domain sampling number of the reference signal.

11. The method according to any one of claims 8-10, wherein the first information is further used to indicate that the interval of the frequency-domain resource mapping relationship of the reference signal is a third frequency-domain resource mapping relationship interval.

12. The method according to any one of claims 1-7, characterized in that, The determining of the frequency-domain resource mapping relationship of the reference signal according to the frequency-domain channel matrix associated with the antenna port and the frequency-domain sampling number of the reference signal associated with the antenna port includes: Performing singular value decomposition on the frequency-domain channel matrix to obtain a singular value decomposition result; Determining a projection matrix according to the singular value decomposition result; wherein the number of rows of the projection matrix is equal to the number of frequency-domain resources associated with the reference signal, and the number of columns of the projection matrix is equal to the number of frequency-domain sub-carriers; Determining a frequency-domain sampling sequence according to the projection matrix; Determining the frequency-domain resource mapping relationship of the reference signal according to the frequency-domain sampling sequence.

13. The method according to claim 12, wherein Determining a frequency-domain sampling sequence index corresponding to the frequency-domain sampling sequence according to the frequency-domain sampling sequence.

14. The method according to claim 13, wherein the first information includes the frequency-domain sampling sequence index.

15. The method according to any one of claims 12-14, wherein the first information is further used to indicate that the interval of the frequency-domain resource mapping relationship of the reference signal is a second frequency-domain resource mapping relationship interval.

16. The method according to any one of claims 12-15, characterized in that, The method further includes: Sending a preset correspondence relationship to the receiving-end device; wherein the preset correspondence relationship is used to indicate the frequency-domain sampling sequence index and the frequency-domain sampling sequence associated with the frequency-domain sampling sequence index.

17. The method according to any one of claims 1-7, characterized in that, The determining of the frequency-domain resource mapping relationship of the reference signal according to the frequency-domain channel matrix associated with the antenna port and the frequency-domain sampling number of the reference signal associated with the antenna port includes: Performing singular value decomposition on the frequency-domain channel matrix to obtain a singular value decomposition result; Determine a projection matrix according to the singular value decomposition result; wherein, the number of rows of the projection matrix is equal to the number of frequency domain resources associated with the reference signal, and the number of columns of the projection matrix is equal to the number of frequency domain subcarriers; Determine a bit map according to the projection matrix; wherein, the bit map is used to indicate the subcarriers associated with each of one or more frequency domain resources associated with the reference signal.

18. The method according to claim 17, wherein The first information includes the bit map.

19. The method according to claim 17 or 18, wherein The first information is further used to indicate that the frequency domain resource mapping relationship interval of the reference signal is a first frequency domain resource mapping relationship interval.

20. A method for transmitting a reference signal, characterized in that, Includes: Obtain first information; wherein, the first information is used to indicate the frequency domain resource mapping relationship of the reference signal associated with the antenna port; Receive or transmit the reference signal according to the frequency domain resource mapping relationship of the reference signal.

21. The method according to claim 20, wherein The first information includes a random number seed.

22. The method according to claim 21, wherein The first information further includes the number of frequency domain samples of the reference signal.

23. The method according to claim 21 or 22, wherein The first information is further used to indicate that the frequency domain resource mapping relationship interval of the reference signal is a third frequency domain resource mapping relationship interval.

24. The method according to any one of claims 21-23, wherein Determine a pseudo-random sequence according to the random number seed; Determine the subcarriers associated with each of one or more frequency domain resources associated with the reference signal according to the pseudo-random sequence and the number of frequency domain samples of the reference signal; Determine the frequency domain resource mapping relationship according to the positions of the subcarriers associated with the reference signal in the third frequency domain resource mapping relationship interval.

25. The method according to claim 20, wherein The first information includes a frequency domain sampling sequence index.

26. The method according to claim 25, wherein The first information is further used to indicate that the frequency domain resource mapping relationship interval of the reference signal is a second frequency domain resource mapping relationship interval.

27. The method according to claim 25 or 26, wherein Determine the frequency domain sampling sequence associated with the frequency domain sampling sequence index from a preset corresponding relationship; wherein, the preset corresponding relationship includes the frequency domain sampling sequence index and the frequency domain sampling sequence associated with the frequency domain sampling sequence index; Determine the subcarriers associated with each of one or more frequency domain resources associated with the reference signal according to the frequency domain sampling sequence; Determine the frequency domain resource mapping relationship according to the positions of the subcarriers associated with the reference signal in the second frequency domain resource mapping relationship interval.

28. The method according to claim 27, wherein The preset corresponding relationship is predefined; or Receive the preset corresponding relationship from the transmitting end device.

29. The method according to claim 20, wherein The first information includes a bitmap, where the bitmap is used to indicate subcarriers associated with each of one or more frequency-domain resources associated with the reference signal.

30. The method according to claim 29, wherein the first information is further used to indicate that the frequency-domain resource mapping relationship interval of the reference signal is a first frequency-domain resource mapping relationship interval.

31. The method according to claim 29 or 30, wherein the frequency-domain resource mapping relationship is used to indicate the position of the subcarriers associated with the reference signal in the first frequency-domain resource mapping relationship interval.

32. The method according to any one of claims 20-31, characterized in that, The method further includes: receiving first indication information from a transmitting-end device; wherein the first indication information is used to indicate the frequency-domain resource mapping relationship interval of the reference signal.

33. The method according to claim 32, wherein the first indication information includes the rank of the frequency-domain channel matrix, a first value, and the number of frequency-domain samples of the reference signal; wherein the first value is the number of singular values in the singular value decomposition result of the frequency-domain channel matrix that satisfy a first condition, and the first condition is that the difference between the reconstruction matrix corresponding to the singular value and the frequency-domain channel matrix is less than or equal to a first threshold; or the first indication information includes an interval index of the frequency-domain resource mapping relationship interval of the reference signal; or the first indication information includes interval frequency-domain range information of the frequency-domain resource mapping relationship interval of the reference signal; or the first indication information includes interval position information of the frequency-domain resource mapping relationship interval of the reference signal.

34. The method according to claim 33, wherein, When the first indication information includes the rank of the frequency-domain channel matrix, the first value, and the number of frequency-domain samples of the reference signal, the method further includes: when the number of frequency-domain samples of the reference signal is less than or equal to the first value, the frequency-domain resource mapping relationship interval of the reference signal is a first frequency-domain resource mapping relationship interval; or when the number of frequency-domain samples of the reference signal is greater than the first value and less than or equal to the rank of the frequency-domain channel matrix, the frequency-domain resource mapping relationship interval of the reference signal is a second frequency-domain resource mapping relationship interval; or when the number of frequency-domain samples of the reference signal is greater than the rank of the frequency-domain channel matrix, the frequency-domain resource mapping relationship interval of the reference signal is a third frequency-domain resource mapping relationship interval.

35. A communication device, characterized in that, The communication device includes a processor; the processor is configured to run a computer program or instruction, so that the reference signal transmission method according to any one of claims 1-19 is executed, or so that the reference signal transmission method according to any one of claims 20-34 is executed.

36. A communication device, characterized in that, The communication device includes an interface circuit and a logic circuit; the interface circuit is configured to input and / or output information; the logic circuit is configured to execute the reference signal transmission method according to any one of claims 1-19, or execute the reference signal transmission method according to any one of claims 20-34, and process and / or generate the information according to the information.

37. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions or programs, which, when run on a computer, cause the method for transmitting a reference signal according to any one of claims 1-19 to be executed, or cause the method for transmitting a reference signal according to any one of claims 20-34 to be executed.

38. A computer program product, characterized in that, The computer program product includes computer instructions; when some or all of the computer instructions are run on a computer, the method for transmitting a reference signal according to any one of claims 1-19 is caused to be executed, or the method for transmitting a reference signal according to any one of claims 20-34 is caused to be executed.

39. A chip, characterized in that, It includes a processor, the processor is coupled to a memory, and the memory is used to store programs or instructions, which, when executed by the processor, cause the method for transmitting a reference signal according to any one of claims 1-19 to be executed, or cause the method for transmitting a reference signal according to any one of claims 20-34 to be executed.

40. A communication system, characterized in that, It includes a communication device for executing the method for transmitting a reference signal according to any one of claims 1-19 and a communication device for executing the method for transmitting a reference signal according to any one of claims 20-34.

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