Communication method and communication apparatus

Abstract

A communication method, comprising: a first communication device receives reference signals from a second communication device, and determines, on the basis of the reference signals, channel information corresponding to N antenna ports of the second communication device. The reference signals correspond to P reference signal ports, the N antenna ports are in one-to-one correspondence with N data ports, the N data ports are used for transmitting uplink data, the P reference signal ports are associated with P antenna ports among the N antenna ports, N is a positive integer, and P is a positive integer less than N. For data from the N antenna ports, in the technical solution, only reference signals for the P antenna ports, instead of reference signals for the N antenna ports, are sent. The first communication device can use spatial-domain channel correlation between antennas to obtain channel information corresponding to the remaining antenna ports that have not sent reference signals, and the association between the N data ports and the N antenna ports is ensured. Thus, the resource overhead for sending reference signals is effectively reduced, and the system capacity is increased.

Description

Communication method and communication apparatus

[0001] This application claims priority to the Chinese patent application No. 202410865754.7, filed on June 28, 2024, and entitled "Communication method and communication apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication, and more particularly, to a communication method and a communication apparatus. BACKGROUND

[0003] Multiple-input multiple-output (MIMO) technology is a core technology of long term evolution (LTE) and new radio (NR) systems. By configuring multiple antennas at the transmitting end and / or receiving end and reasonable signal processing (such as precoding, etc.), parallel transmission of multiple data streams can be achieved. For uplink transmission, when a terminal device is configured with multiple antenna transmitting radio frequency channels, the device can perform uplink MIMO transmission through multiple antennas.

[0004] Currently, the NR protocol supports two uplink MIMO transmission modes of codebook-based transmission and non-codebook transmission. For codebook-based transmission, uplink channel measurement is mainly based on uplink sounding reference signals (SRS).

[0005] Generally, when performing uplink codebook-based transmission, the number of SRS ports required for configuration is equal to the number of terminal antenna ports. Facing the future demand for higher user experience, with the maturation of multi-antenna technology, the number of terminal antenna ports may be doubled, which will lead to a doubling of the number of SRS ports required. Different SRS ports are usually multiplexed through different time-frequency resources or code resources, and the increase in the number of SRS ports will increase the resources occupied by SRS. The increase in SRS resource overhead will directly squeeze the available resources for data transmission, thereby causing a loss of system capacity. How to reduce the resource overhead of uplink reference signals has become a problem to be solved. SUMMARY

[0006] The present application provides a communication method to reduce the resource overhead of uplink reference signals.

[0007] In a first aspect, a communication method is provided. The method can be performed by a first communication device. In the absence of specific description, the "first communication device" in the present application can refer to the first communication device itself (for example, a network device, a terminal device, etc.), a component (for example, a processor, a chip, or a chip system, etc.) in the first communication device, or a logic module or software capable of realizing all or part of the functions of the first communication device. For ease of description, the following description takes the first communication device as an example.

[0008] The communication method includes: receiving a reference signal from a second communication device, the reference signal corresponding to P reference signal ports. Determining channel information corresponding to N antenna ports of the second communication device according to the reference signal, the N antenna ports corresponding to N data ports one by one, the N data ports being used for transmitting data, the data being data sent by the second communication device to the first communication device, wherein the P reference signal ports are associated with P antenna ports of the N antenna ports, N is a positive integer, and P is a positive integer less than N.

[0009] Based on the above technical solution, the first communication device can determine the channel information corresponding to the N antenna ports of the second communication device based on the reference signal sent by the second communication device. The second communication device sends the reference signal at the P antenna ports associated with the P reference signal ports, the P reference signal ports correspond to P data ports of the N data ports one by one, the N antenna ports correspond to the N data ports one by one, and P is a positive integer less than N. It can be understood that for channel measurement and data transmission of the N antenna ports, the technical solution only sends reference signals of the P antenna ports instead of reference signals of the N antenna ports, the first communication device can utilize the spatial antenna inter-channel correlation to obtain the channel information corresponding to the remaining antenna ports which do not send reference signals or are not measured, and the association between the N data ports and the N antenna ports is ensured. Thus, the resource overhead of sending reference signals is effectively reduced, which helps to improve the system capacity.

[0010] In combination with the first aspect, in some implementations of the first aspect, first indication information is sent to the second communication device, the first indication information being used to indicate the P reference signal ports of the N reference signal ports corresponding to a first reference signal resource, wherein the first reference signal resource is one of at least one reference signal resource configured by the first communication device for the second communication device, each reference signal resource of the at least one reference signal resource corresponding to N reference signal ports, the N reference signal ports corresponding to the N antenna ports one by one, and the N reference signal ports corresponding to the N data ports one by one.

[0011] Based on the technical solution, the first communication device can configure reference signal resources of N reference signal ports for the second communication device. For example, the first communication device configures at least one reference signal resource for the second communication device, and each reference signal resource corresponds to N reference signal ports. In addition, the N reference signal ports correspond to the N antenna ports one by one, and the N reference signal ports correspond to the N data ports one by one, thereby establishing the association between the N antenna ports, the N reference signal ports, and the N data ports of the second communication device.

[0012] Further, in the technical solution, the first communication device indicates, through the first indication information, P reference signal ports of the N reference signal ports corresponding to the reference signal resource, which actually transmit the reference signal, thereby explicitly indicating the second communication device to transmit or not to transmit the reference signal antenna port. In the case of transmitting the reference signal in part of the reference signal ports, it can be explicitly indicated which antenna ports of the second communication device perform the reference signal transmission.

[0013] In combination with the first aspect, in some implementations of the first aspect, the first indication information is used to indicate the P reference signal ports of the N reference signal ports corresponding to the first reference signal resource, including: the first indication information indicates P reference signal ports of the N reference signal ports corresponding to the first reference signal resource, which are used to transmit the reference signal; or the first indication information indicates Q reference signal ports of the N reference signal ports corresponding to the first reference signal resource, which are not used to transmit the reference signal, and the Q reference signal ports are reference signal ports other than the P reference signal ports in the N reference signal ports.

[0014] Based on the technical solution, the first communication device can indicate, through the first indication information, P reference signal ports of the N reference signal ports used to transmit the reference signal, or Q reference signal ports of the N reference signal ports not used to transmit the reference signal, to achieve the purpose of indicating the P reference signal ports and improve the flexibility of the scheme. The N reference signal ports correspond to the N antenna ports of the second communication device, thereby indicating, through the first indication information, P antenna ports of the N antenna ports of the second communication device used to transmit the reference signal, or Q antenna ports of the N antenna ports of the second communication device not used to transmit the reference signal.

[0015] In combination with the first aspect, in some implementations of the first aspect, the first indication information is an N-bit bitmap, each bit corresponds to one of the N reference signal ports, and each bit is used to indicate whether its corresponding reference signal port is used to transmit the reference signal; or the first indication information is an identifier, and the identifier is used to indicate the P reference signal ports of the N reference signal ports.

[0016] Based on the above technical solution, the form of the first indication information can be various, for example, the first indication information can be in the form of a bit map, an index, or an identifier, and the specific form of the first indication information is not limited, thereby improving the flexibility of the first indication information.

[0017] With reference to the first aspect, in some implementations of the first aspect, the method further includes: sending, to the second communication device, first configuration information, the first configuration information being used to configure at least one reference signal resource group, each reference signal resource group including a plurality of reference signal resources, a first reference signal resource in the plurality of reference signal resources corresponding to the P reference signal ports, and a second reference signal resource in the plurality of reference signal resources corresponding to N reference signal ports, the N reference signal ports one-to-one corresponding to the N antenna ports, and the N reference signal ports one-to-one corresponding to the N data ports.

[0018] Based on the above technical solution, the first communication device can configure two associated reference signal resources in one reference signal resource group, one reference signal resource corresponding to N reference signal ports, the N reference signal ports one-to-one corresponding to N antenna ports, and the N reference signal ports one-to-one corresponding to N data ports, thereby establishing the association between the N antenna ports, the N reference signal ports, and the N data ports. Another reference signal resource corresponds to P reference signal ports, the P antenna ports corresponding to the P reference signal ports being used to transmit reference signals, which is equivalent to indicating the P reference signal ports of the actually transmitted reference signals, thereby explicitly indicating the second communication device to transmit or not to transmit the reference signal antenna ports. In the case of transmitting reference signals in part of the reference signal ports, the second communication device can be explicitly indicated to transmit reference signals through which antenna ports.

[0019] With reference to the first aspect, in some implementations of the first aspect, the method further includes: sending, to the second communication device, second indication information, the second indication information being used to indicate that the first reference signal resource corresponds to each reference signal port in the P reference signal ports, and that the second reference signal resource corresponds to one reference signal port in the N reference signal ports.

[0020] Based on the technical solution, the first communication device can indicate the correspondence between the P reference signal ports corresponding to the first reference signal resource and the P reference signal ports corresponding to the second reference signal resource through the second indication information. Since the N reference signal ports correspond to the N antenna ports one by one and correspond to the N data ports one by one, the P reference signal ports corresponding to the P antenna ports and the P data ports corresponding to the P reference signal ports can be indicated through the second indication information. Therefore, the association between the N data ports and the N antenna ports can be effectively determined in the case of transmitting the reference signal through part of the antenna ports.

[0021] With reference to the first aspect, in some implementations of the first aspect, among the reference signal ports corresponding to the first reference signal resource and the second reference signal resource, the associated reference signal ports correspond to the same antenna port.

[0022] With reference to the first aspect, in some implementations of the first aspect, the method further includes: sending, to the second communication device, third indication information, the third indication information being used to indicate a first period and a second period, wherein the first period is a transmission period of the reference signal resource corresponding to the N reference signal ports, and the second period is a transmission period of the reference signal resource corresponding to the P reference signal ports.

[0023] Based on the technical solution, the first communication device can indicate the transmission period of the reference signal resource corresponding to the N reference signal ports and the transmission period of the reference signal resource corresponding to the P reference signal ports through the third indication information, and establish the transmission period relationship between the reference signal resource of the N reference signal ports (full ports) and the reference signal resource of the P reference signal ports (partial ports). Therefore, the full port and the partial port reference signal transmission under long-short period matching can be implemented, wherein the full port can be transmitted in a long period to obtain the correlation matrix between the antenna ports, and the partial port can be transmitted in a short period to reduce the overhead of the reference signal resource.

[0024] With reference to the first aspect, in some implementations of the first aspect, the third indication information is used to indicate a first ratio, the first ratio being a ratio of the first period to the second period, or the first ratio being a ratio of the second period to the first period.

[0025] With reference to the first aspect, in some implementations of the first aspect, the method further includes: sending, to the second communication device, second configuration information, the second configuration information being used to configure at least one reference signal resource, each of the reference signal resources corresponding to the P reference signal ports.

[0026] Based on the above technical solution, the first communication device can configure a reference signal resource of P reference signal ports, so that the second communication device can send a reference signal in part of the reference signal ports.

[0027] In combination with the first aspect, in some implementations of the first aspect, the method further includes: sending fourth indication information to the second communication device, the fourth indication information being used to indicate that each reference signal port corresponding to each reference signal resource is associated with one data port of the N data ports.

[0028] Based on the above technical solution, the first communication device can indicate the correspondence between the P reference signal ports and the P data ports of the N data ports through the fourth indication information. Since the N data ports correspond one-to-one to the N antenna ports and correspond one-to-one to the N data ports, the P antenna ports corresponding to the P reference signal ports corresponding to the reference signal resource and the P data ports can be indicated through the fourth indication information. Thus, the association between the N data ports and the N antenna ports can still be effectively determined in the case of sending a reference signal in part of the antenna ports.

[0029] In combination with the first aspect, in some implementations of the first aspect, the associated reference signal port and data port correspond to the same antenna port.

[0030] In combination with the first aspect, in some implementations of the first aspect, the method further includes: sending at least one of the following information to the second communication device: information indicating that the function of the reference signal resource is codebook-based transmission, information indicating the time-frequency resource mapped by the reference signal resource, information indicating the transmission period of the reference signal resource, or information indicating the sequence corresponding to the reference signal.

[0031] In combination with the first aspect, in some implementations of the first aspect, in the case where the P reference signal ports are mapped within one time domain unit, the transmission power corresponding to each of the P reference signal ports is a ratio of the transmission power of the second communication device to the P, and the transmission power corresponding to each of the N data ports is a ratio of the transmission power of the second communication device to the N.

[0032] Based on the above technical solution, since the number of reference signal ports actually sending a reference signal is different from the number of data ports, the effective transmission power of each port of the N data ports is not aligned with the effective transmission power of each port of the P reference signal ports. The power of the data ports and the reference signal ports can be defined, so that the second communication device can accurately estimate the actual experienced channel based on the result of the channel measurement based on the reference signal.

[0033] In a second aspect, a communication method is provided. The method can be performed by a second communication device. In the absence of specific statements, the "second communication device" in the present application can refer to the second communication device itself (e.g., a terminal device, a network device, etc.), a component (e.g., a processor, a chip, or a chip system, etc.) in the second communication device, or a logic module or software capable of realizing all or part of the functions of the second communication device. For ease of description, the following description takes the second communication device as an example.

[0034] The communication method includes: generating P antenna port corresponding reference signals; and sending the reference signals to a first communication device, wherein the P reference signal ports are associated with P antenna ports of N antenna ports of the second communication device, N is a positive integer, P is a positive integer less than N, the N antenna ports correspond to N data ports one by one, and the N data ports are used for transmitting data, and the data is data sent by the second communication device to the first communication device.

[0035] In combination with the second aspect, in some implementations of the second aspect, the method further includes: receiving first indication information from the first communication device, the first indication information being used to indicate the P reference signal ports of N reference signal ports corresponding to a first reference signal resource, wherein the first reference signal resource is one of at least one reference signal resource configured by the first communication device for the second communication device, each of the at least one reference signal resource corresponds to N reference signal ports, the N reference signal ports correspond to the N antenna ports one by one, and the N reference signal ports correspond to the N data ports one by one.

[0036] In combination with the second aspect, in some implementations of the second aspect, the first indication information is used to indicate the P reference signal ports of the N reference signal ports corresponding to the first reference signal resource, including: the first indication information indicates the P reference signal ports of the N reference signal ports corresponding to the first reference signal resource, which are used for sending the reference signals; or the first indication information indicates Q reference signal ports of the N reference signal ports corresponding to the first reference signal resource, which are not used for sending the reference signals, and the Q reference signal ports are reference signal ports other than the P reference signal ports in the N reference signal ports.

[0037] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving first configuration information from the first communication device, the first configuration information being used to configure at least one reference signal resource group, each of the reference signal resource groups including a plurality of reference signal resources, a first reference signal resource of the plurality of reference signal resources corresponding to the P reference signal ports, a second reference signal resource of the plurality of reference signal resources corresponding to N reference signal ports, the N reference signal ports one-to-one corresponding to the N antenna ports, the N reference signal ports one-to-one corresponding to the N data ports.

[0038] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving second indication information from the first communication device, the second indication information being used to indicate that the first reference signal resource corresponds to each of the P reference signal ports, and one of the N reference signal ports corresponding to the second reference signal resource.

[0039] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving third indication information from the first communication device, the third indication information being used to indicate a first period and a second period, wherein the first period is a transmission period of the reference signal resource corresponding to the N reference signal ports, and the second period is a transmission period of the reference signal resource corresponding to the P reference signal ports.

[0040] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving second configuration information from the first communication device, the second configuration information being used to configure at least one reference signal resource, each of the reference signal resources corresponding to the P reference signal ports.

[0041] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving fourth indication information from the first communication device, the fourth indication information being used to indicate that each of the reference signal resources corresponds to each of the P reference signal ports, and one of the N data ports corresponding to the reference signal resource.

[0042] With reference to the second aspect, in some implementations of the second aspect, the method further includes receiving at least one of the following information from the first communication device: information indicating that a function of a reference signal resource is codebook-based transmission, information indicating time-frequency resources mapped by a reference signal resource, information indicating a transmission period of the reference signal resource, or information indicating a sequence corresponding to a reference signal.

[0043] With reference to the second aspect, in some implementations of the second aspect, when the P reference signal ports are mapped in one time domain unit, a transmission power corresponding to each of the P reference signal ports is a ratio of a transmission power of the second communication device and the P, and a transmission power corresponding to each of the N data ports is a ratio of the transmission power of the second communication device and the N.

[0044] The technical effects of the method according to the second aspect and possible designs of the second aspect can refer to the technical effects of the first aspect and possible designs of the first aspect.

[0045] In a third aspect, a communication apparatus is provided. The communication apparatus is configured to implement the first aspect and any of the possible implementations of the first aspect. Specifically, the communication apparatus includes a processor and a memory storing a computer program. The processor is configured to invoke and run the computer program stored in the memory, so that the communication apparatus implements the first aspect and any of the possible implementations of the first aspect.

[0046] In an implementation, the communication apparatus is a network device. When the communication apparatus is a network device, the transceiver unit can be a transceiver, or an input / output interface. The processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0047] In another implementation, the communication apparatus can be a chip, a chip system or a circuit in a network device. In this case, the transceiver unit can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit on the chip, the chip system or the circuit; and the processing unit can be at least one processor, a processing circuit or a logic circuit.

[0048] In a fourth aspect, a communication apparatus is provided. The communication apparatus is configured to implement the second aspect and any of the possible implementations of the second aspect. Specifically, the communication apparatus includes a processor and a memory storing a computer program. The processor is configured to invoke and run the computer program stored in the memory, so that the communication apparatus implements the second aspect and any of the possible implementations of the second aspect.

[0049] In an implementation, the communication apparatus is a terminal device. When the communication apparatus is a terminal device, the transceiver unit can be a transceiver, or an input / output interface. The processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0050] In another implementation, the communication apparatus can be a chip, a chip system or a circuit in a terminal device. In this case, the transceiving unit can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit on the chip, the chip system or the circuit; and the processing unit can be at least one processor, a processing circuit or a logic circuit.

[0051] In a fifth aspect, a computer readable storage medium is provided. The computer readable storage medium stores a computer program which, when executed, causes the method of any one of the implementation manners of the first aspect and the second aspect to be performed.

[0052] In a sixth aspect, a computer program product containing instructions is provided. When the computer program product is executed, the method provided by any one of the implementation manners of the first aspect and the second aspect is performed.

[0053] In a seventh aspect, a chip is provided. The chip includes a processor and a communication interface. The processor reads instructions through the communication interface and executes the method provided by any one of the implementation manners of the first aspect and the second aspect.

[0054] Optionally, as an implementation manner, the chip further includes a memory. The memory stores a computer program or instructions. The processor is configured to execute the computer program or instructions stored on the memory. When the computer program or instructions are executed, the processor is configured to execute the method provided by any one of the implementation manners of the first aspect and the second aspect.

[0055] In an eighth aspect, a communication system is provided. The communication system includes the communication apparatus of the third aspect and the communication apparatus of the fourth aspect.

[0056] In a ninth aspect, a computer program is provided. When the computer program is executed, the method provided by any one of the implementation manners of the first aspect and the second aspect is executed. BRIEF DESCRIPTION OF DRAWINGS

[0057] FIG. 1 is a schematic diagram of a communication system suitable for the present application.

[0058] FIG. 2 is a schematic diagram of a 4-port SRS resource implementing 8 antenna port channel measurement.

[0059] FIG. 3 is a schematic flowchart of a communication method provided by an embodiment of the present application.

[0060] FIG. 4 is a schematic diagram of an SRS resource configuration provided by an embodiment of the present application.

[0061] FIG. 5 is another schematic diagram of an SRS resource configuration provided by an embodiment of the present application.

[0062] FIG. 6 is a schematic diagram of another SRS resource configuration according to an embodiment of the present application.

[0063] FIG. 7 is a schematic block diagram of a communication device according to an embodiment of the present application.

[0064] FIG. 8 is a schematic diagram of another communication device according to an embodiment of the present application.

[0065] FIG. 9 is a schematic diagram of a chip system according to an embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to facilitate understanding of the embodiments of the present application, the following points are first explained.

[0067] First, in the present application, "for indicating" can include direct indication and indirect indication. When describing that certain indication information is for indicating A, it can include that the indication information directly indicates A or indirectly indicates A, and does not mean that A must be carried in the indication information.

[0068] The information indicated by the indication information is referred to as to-be-indicated information. In the specific implementation process, there are many ways to indicate the to-be-indicated information, for example, but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or an index of the to-be-indicated information. The to-be-indicated information can also be indirectly indicated by indicating other information, where the other information and the to-be-indicated information have an association relationship. The to-be-indicated information can also be only indicated in part, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be achieved by means of the arrangement order of each information agreed in advance (for example, a protocol stipulates), thereby reducing the indication overhead to a certain extent. At the same time, the common part of each information can be identified and uniformly indicated, so as to reduce the indication overhead caused by separately indicating the same information.

[0069] Second, in the present application, "at least one" means one or more, and "multiple" means two or more (including two). In addition, in the embodiments of the present application, "first", "second", and various numerical numbers (for example, "#1", "#2", etc.) are only for the convenience of description and do not limit the scope of the embodiments of the present application. The size of the serial number of each process below does not mean the execution order, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. It should be understood that the objects thus described can be interchanged under appropriate circumstances, so as to be able to describe schemes other than the embodiments of the present application. In addition, in the embodiments of the present application, the word "S310" is only for the convenience of description and does not limit the order of execution steps.

[0070] Third, in the embodiments of the present application, the words such as "exemplary" or "for example" are used to represent that an example, an example or an illustration is made. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words such as "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0071] Fourth, in the embodiments of the present application, "save" can refer to saving in one or more memories. The one or more memories can be separately arranged or integrated in the encoder or decoder, processor, or communication device. The one or more memories can also be partially separately arranged and partially integrated in the decoder, processor, or communication device. The type of memory can be any form of storage medium, which is not limited in the present application.

[0072] Fifth, in the embodiments of the present application, "protocol" can refer to a standard protocol in the communication field, which can include NR protocol and related protocols applied to future communication systems, which is not limited in the present application.

[0073] Sixth, in the embodiments of the present application, "of", "corresponding", "corresponding" and "associated" can be used interchangeably at times. It should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent.

[0074] Seventh, in the embodiments of the present application, "in the case of", "when", "if" can be used interchangeably at times. It should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent.

[0075] Eighth, the term "and / or" in this paper is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the existence of A alone, A and B, and B alone. In addition, the character " / " in this paper generally represents an "or" relationship between the associated objects before and after it.

[0076] Ninth, "message", "information", or "information element (IE)" and the like can be used interchangeably in this paper, and the name of the message or information is not limited in any way, as long as the corresponding function can be realized.

[0077] Tenth, in this application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending information to XX" can be understood as the destination of the information is XX, and "sending information" can include direct sending or indirect sending through other units or modules. "Receiving information from YY" can be understood as the source of the information is YY, and "receiving information" can include direct receiving from YY or indirectly receiving from YY through other units or modules. In addition to the air interface sending or receiving signals realized by the whole machine level such as network equipment or terminal equipment, "sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface. For example, the modem or system-level chip (such as SoC chip or SIP chip, etc.) sends or receives signals. "Sending" or "receiving" can also be carried out by device components, such as sending or receiving signals through several parts, modules, chips of the device by bus, wire or interface.

[0078] The technical solutions in this application will be described below with reference to the accompanying drawings.

[0079] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: an LTE system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) communication system, a 5th generation (5G) system or NR, and a future communication system, vehicle-to-X (V2X), where V2X can include vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to pedestrian (V2P), etc., LTE-V, Internet of Vehicles, machine type communication (MTC), Internet of Things (IoT), long term evolution-machine (LTE-M), machine to machine (M2M), etc.

[0080] FIG. 1 is a schematic diagram of a wireless communication system suitable for the embodiments of the present application. As shown in FIG. 1, the communication system 100 can include at least one network device, for example, the network device 101 shown in FIG. 1. The communication system 100 can also include at least one terminal device, for example, the terminal devices 102 to 107 shown in FIG. 1. Among them, the terminal devices 102 to 107 can be mobile or fixed. The network device 101 can provide communication coverage for a specific geographic area, and the terminal devices 102 to 107 can be terminal devices located in the coverage area. The network device 101 and one or more of the terminal devices 102 to 107 can communicate through a wireless link.

[0081] Optionally, the terminal devices can communicate directly with each other. For example, the direct communication between the terminal devices can be implemented by using a device to device (D2D) technology or the like. As shown in FIG. 1, the terminal device 105 and the terminal device 106, and the terminal device 105 and the terminal device 107 can communicate directly by using the D2D technology. The terminal device 106 and the terminal device 107 can communicate with the terminal device 105 separately or simultaneously.

[0082] The terminal devices 105 to 107 can also communicate with the network device 101 respectively. For example, the terminal devices 105 and 106 can communicate directly with the network device 101 as shown in the figure, and the terminal device 107 can communicate with the network device 101 indirectly via the terminal device 105 as shown in the figure.

[0083] A network device is a network-side device with wireless transceiving function. The network device can be an apparatus in a radio access network (RAN) that provides wireless communication function for terminal devices. The network device can be a 3rd generation partnership project (3GPP)-related cellular system, such as a 5G mobile communication system, or a future-oriented evolved system (such as a 6G mobile communication system). The network device can also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. For example, the network device can be a base station, an evolved NodeB (eNodeB), a next generation NodeB (gNB) in a 5G mobile communication system, a base station in a subsequent evolution of 3GPP, a transmission reception point (TRP), an access node in a WiFi system, a wireless relay node, a wireless backhaul node, etc. In a communication system employing different radio access technologies (RATs), the name of the device with base station function can be different. For example, in an LTE system, it can be referred to as an eNB or eNodeB, and in a 5G system or NR system, it can be referred to as a gNB. The specific name of the base station is not limited in the present application. The network device can contain one or more co-sited or non-co-sited transmission reception points. For another example, the network device can include at least one of the following: one or more central units (CUs), one or more distributed units (DUs), and one or more radio units (RUs).

[0084] In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, the CU can also be referred to as O-CU (open CU), the DU can also be referred to as O-DU (open DU), the CU-CP can also be referred to as O-CU-CP, the CU-UP can also be referred to as O-CU-UP, and the RU can also be referred to as O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. Exemplarily, the functions of the CU can be implemented by one entity or different entities. For example, the functions of the CU are further divided, i.e., the control plane and the user plane are separated and implemented by different entities, which are the control plane CU entity (i.e., the CU-CP entity) and the user plane CU entity (i.e., the CU-UP entity), respectively. The CU-CP entity and the CU-UP entity can be coupled with the DU to jointly complete the functions of the access network device. For example, the CU is responsible for processing non-real-time protocols and services, implementing the functions of the radio resource control (RRC) and the packet data convergence protocol (PDCP) layer. The DU is responsible for processing the physical layer protocol and real-time services, implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer and the physical (PHY) layer. In this way, part of the functions of the wireless access network device can be implemented by multiple network function entities. These network function entities can be network elements in a hardware device, or software functions running on a dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform). The network device can also include an active antenna unit (AAU). The AAU implements part of the physical layer processing functions, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, in this architecture, high-layer signaling, such as RRC layer signaling, can also be considered as being sent by the DU, or by the DU+AAU. It can be understood that the network device can be a device including one or more of the CU node, the DU node and the AAU node. In addition, the CU can be divided into a network device in the RAN, or the CU can be divided into a network device in the core network (CN), which is not limited in this application.For another example, in vehicle to everything (V2X) technology, the access network device can be a road side unit (RSU). A plurality of access network devices in a communication system can be base stations of the same type or base stations of different types. A base station can communicate with a terminal device directly or through a relay station. In embodiments of the present application, the device for implementing the function of a network device can be the network device itself or a device capable of supporting the network device to implement the function, such as a chip system or a combination device or component capable of implementing the function of an access network device, which can be installed in the network device. In embodiments of the present application, the chip system can be composed of a chip or can include a chip and other discrete devices.

[0085] The terminal device is a user-side device with wireless transceiver function, which can be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device (such as a communication module, a modem, or a chip system) built into the above devices. The terminal device is used to connect people, things, machines, etc., and can be widely used in various scenarios, such as cellular communication, D2D communication, V2X communication, machine-to-machine / machine-type communication (M2M / MTC) communication, Internet of Things, virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, unmanned aerial vehicle, robot, etc. Exemplarily, the terminal device can be a handheld terminal in cellular communication, a communication device in D2D, an Internet of Things device in MTC, a monitoring camera in smart transportation and smart city, or a communication device on an unmanned aerial vehicle, etc. The terminal device can also be referred to as user equipment (UE), user terminal, user device, user unit, user station, terminal, access terminal, access station, UE station, remote station, mobile device, or wireless communication device, etc. The terminal device can also be a terminal device in an IoT system. IoT is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the intelligent network of man-machine interconnection and object-object interconnection. In the embodiments of the present application, IoT technology can achieve massive connection, deep coverage, and terminal power saving through, for example, narrow band (NB) technology. In the embodiments of the present application, the device for realizing the function of the terminal device can be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system or a combination device or component that can realize the function of the terminal device, which can be installed in the terminal device. The terminal device is usually provided with a communication module, circuit or chip (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or system in package (SIP) chip containing a modem core) for executing corresponding communication functions. The terminal device is also configured with program instructions for executing corresponding communication functions.

[0086] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; and can also be deployed on airplanes, balloons and satellites in the air. The scene where the network device and the terminal device are located is not limited in the embodiments of the present application.

[0087] Each communication device in the communication system 100 shown in FIG. 1 can be configured with multiple antennas. For each communication device, the configured multiple antennas can include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. Therefore, the communication devices in the communication system 100 can communicate with each other through multiple-input multiple-output (MIMO) technology.

[0088] It should be understood that FIG. 1 is only a simplified schematic diagram for ease of understanding, and other network devices or other terminal devices can also be included in the communication system 100, which are not shown in FIG. 1. The embodiments of the present application can be applied to any communication scenario where the transmitting end device and the receiving end device communicate.

[0089] For example, the communication system 100 can further include an application function (AF) network element, which is a control plane network function provided by an operator network and used to provide application layer information; and the communication system 100 can further include a session management function (SMF) network element, which is a control plane network function provided by an operator network. In the embodiments of the present application, when the AF network element and the SMF network element are included in the communication system 100, the AF can send information related to services to the network device through the SMF.

[0090] To facilitate understanding of the embodiments of the present application, first, the basic concepts involved in the present application are described.

[0091] 1. Antenna port (antenna port): can be referred to as port (port). It can be understood as a transmitting antenna identified by a receiving end, or a transmitting antenna that can be distinguished in space, which can be a physical antenna or a virtual antenna or a spatial resource. The receiving end can be a network device or a terminal device. Each virtual antenna or spatial resource can correspond to an antenna port, and each virtual antenna can be a weighted combination of multiple physical antennas.

[0092] The antenna port in this application can be an antenna port of a terminal device or an antenna port of a network device. Therefore, for a terminal device, the antenna port of the terminal device can be referred to as a terminal device antenna port, a terminal antenna port, a terminal transmission antenna port, or a terminal reception antenna port, etc. Similarly, for a network device, the antenna port of the network device can be referred to as a network device antenna port, a network antenna port, a network transmission antenna port, or a network reception antenna port, etc.

[0093] 2. Reference signal port: a port carrying a reference signal is referred to as a reference signal port. Each reference signal port is associated with an antenna port in this application. The reference signal port can include, but is not limited to, an SRS port, a DMRS port, a channel state information reference signal (CSI-RS) port, etc.

[0094] For a DMRS port, each DMRS port corresponds to a spatial stream or a spatial layer. Each DMRS port corresponds to a port index. Each DMRS port corresponds to a DMRS sequence, and each DMRS port corresponds to one or more time-frequency resources. The corresponding DMRS sequence is mapped in the time-frequency resource unit contained in the one or more time-frequency resources according to a rule. The DMRS sequence can also be referred to as a DMRS symbol sequence or a DMRS symbol vector. The time-frequency resource unit can be a frequency domain subcarrier or an orthogonal frequency division multiplexing (OFDM) symbol, or a resource element (RE).

[0095] For an SRS port, each SRS port corresponds to a terminal antenna or a terminal antenna port, which is also referred to as a terminal reception antenna or a terminal antenna port. Each SRS port corresponds to an SRS sequence, which is mapped in the corresponding time-frequency resource unit. Different SRS ports can be multiplexed by different SRS sequences or different time-frequency resources. SRS is an uplink reference signal sent by a terminal device to a network device. After receiving the SRS signal, the network device can obtain the UL channel information from the terminal device to the network device according to the SRS signal. If the uplink and downlink channels have reciprocity characteristics (such as a TDD system), the network device can also obtain the DL channel information from the terminal device to the network device based on the SRS-based uplink channel measurement. After obtaining the UL channel information corresponding to the terminal device, the network device can perform data transmission resource scheduling or precoding processing on the terminal device according to the channel information.

[0096] 3、Data port: the port carrying data is called a data port. In this application, each data port is associated with an antenna port, and each data port corresponds to a reference signal port. Among them, the reference signal port can include but is not limited to a physical uplink shared channel (PUSCH) port.

[0097] 5、Spatial layer: for spatial multiplexing MIMO systems, multiple parallel data streams can be transmitted simultaneously on the same time-frequency resource, each data stream is called a spatial layer or a spatial stream or a layer. For a terminal device, the number of spatial layers or data streams corresponding to the transmission or reception can also be called rank. The number of spatial layers or data streams corresponding to the transmission or reception can also be called the value of the rank, or the rank value. The spatial layer can also be called a layer, a data stream or a stream.

[0098] 6、Reference signal: also known as pilot, in this application, SRS is taken as an example, but not limited to this, such as other reference signals, such as but not limited to the following reference signals:

[0099] Demodulation reference signal (DMRS), channel state information-reference signal (CSI-RS), tracking reference signal (TRS), phase tracking reference signal (PT-RS), positioning reference signal (PRS), sensing reference signal (SeRS), etc.

[0100] 7、MIMO spatial multiplexing: MIMO is the core technology of LTE and NR systems. By configuring multiple antennas at the sending end and / or receiving end, and through reasonable signal processing (such as precoding), multiple data streams can be transmitted in parallel, also known as MIMO spatial multiplexing. MIMO spatial multiplexing can effectively improve system capacity.

[0101] 8、Uplink transmission: For uplink transmission, when the terminal is configured with multiple antenna transmission radio frequency channels, the terminal can perform uplink MIMO transmission through multiple antennas. Alternatively, multiple terminals simultaneously transmit on the same time-frequency resource to form a virtual MIMO system, i.e., uplink multi-user multiple-input multiple-output (UL MU-MIMO) transmission.

[0102] Currently, NR protocol supports two uplink MIMO transmission modes: codebook-based transmission and non-codebook transmission.

[0103] 9、Codebook-based uplink transmission: For codebook-based transmission, uplink channel measurement is mainly based on uplink reference signal SRS. Based on the channel measurement result, the network device selects the optimal number of spatial layers (also known as rank) for uplink data transmission, and selects the precoding matrix corresponding to the number of spatial layers for uplink transmission in the predefined precoding matrix set (also known as codebook). Further, through control signaling, the terminal device is instructed the number of spatial layers and the index corresponding to the precoding matrix for uplink data transmission. The terminal device will use the indicated number of spatial layers and precoding matrix for transmission when transmitting uplink data.

[0104] The number of SRS ports required for codebook-based uplink transmission is equal to the number of terminal antenna ports. To meet the future demand for higher user experience, with the maturation of multi-antenna technology, the number of terminal antenna ports will be multiplied, which will result in a multiplied increase in the number of SRS ports required. The increase in SRS overhead will directly squeeze the available resources for data transmission, resulting in a loss of system capacity.

[0105] Exemplarily, codebook-based uplink transmission includes codebook-based physical uplink shared channel (PUSCH) transmission: For codebook-based uplink data transmission, its transmission mechanism is closely related to the SRS resource corresponding to the network device configuration.

[0106] Exemplarily, the codebook-based uplink data transmission process is as follows:

[0107] Step one: the network device configures SRS resource for the terminal device.

[0108] Specifically, the usage of the SRS resource is codebook. The network device can configure at most 2 SRS resources for the terminal device, and each SRS resource contains n ports.

[0109] Step two: the terminal device sends SRS to the network device.

[0110] In an implementation, the n ports of each SRS resource correspond to n antenna ports of the terminal device. The terminal device sends SRS to the network device through the corresponding n antenna ports based on the configured SRS resource.

[0111] As an example but not limitation, each SRS port corresponding to the sent SRS resource can correspond to different time-frequency resources or different SRS sequences.

[0112] For example, for a terminal device with 4 transmitting antenna ports (4Tx terminal), the network device configures one SRS resource for the terminal device, and the SRS resource corresponds to 4 SRS ports. The 4 SRS ports corresponding to the SRS resource can be mapped to the same subcarrier (also called frequency domain comb) of the same OFDM symbol, but correspond to different cyclic shifts (CS) in sequence, thereby ensuring the orthogonality or low interference between the ports. Or,

[0113] The 4 SRS ports corresponding to the SRS resource can be mapped to 2 different subcarriers (also called frequency domain comb) of the same OFDM symbol, each subcarrier corresponds to 2 SRS ports, and the 2 SRS ports correspond to different cyclic shifts. Assuming that the total transmission power of the terminal device sending the SRS resource is P, the total power is evenly distributed to n=4 SRS ports, that is, the transmission power corresponding to each SRS port is P / 4.

[0114] Step three: the network device performs uplink channel measurement according to the SRS sent by the terminal device, performs resource scheduling for the terminal device, and determines the information such as the SRS resource corresponding to the uplink transmission, the number of spatial layers of the uplink transmission, the corresponding precoding matrix, and the corresponding modulation and coding scheme (MCS).

[0115] Step four: the network device informs the UE of the resource allocation of the PUSCH, the corresponding MCS and the transmit precoding matrix indicator (TPMI), the rank and the corresponding SRS resource indicator.

[0116] Exemplarily, assuming that the network device configures 2 SRS resources (SRS resource 0 and SRS resource 1) for the terminal device, the network device finds that the channel quality of the antenna port corresponding to the SRS resource 0 is better by performing channel measurement on the SRS resource 0 and the SRS resource 1, and then indicates the network device that SRI = 0, indicating that the terminal antenna port corresponding to the SRS resource 0 is used for subsequent uplink data transmission.

[0117] Meanwhile, the network device selects the best rank and precoding matrix in the predefined precoding matrix set based on the channel measurement result, and indicates the rank and precoding matrix index to the terminal device for subsequent data transmission. For different rank values, different precoding matrix sets are used.

[0118] For ease of understanding, the following takes a 4Tx terminal device as an example to illustrate the precoding matrix set corresponding to 4-port transmission, which is shown in Tables 1-4.

[0119] Table 1-4: Precoding matrix set corresponding to single-stream transmission of 4 antenna ports

[0120] Table 2-4: Precoding matrix set corresponding to 2-stream transmission of 4 antenna ports

[0121] Table 3-4: Precoding matrix set corresponding to 3-stream transmission of 4 antenna ports

[0122] Table 4-4: Precoding matrix set corresponding to 4-stream transmission of 4 antenna ports

[0123] It should be noted that the number of PUSCH transmission ports is equal to the number of SRS ports of the SRS resource associated therewith. The PUSCH ports 0, 1, …, n-1 correspond to the SRS ports 0, 1, …, n-1, respectively. The terminal device needs to assume that each port of the PUSCH and the SRS port associated therewith correspond to the same terminal transmission antenna port.

[0124] 10. Spatial SRS Port Measurement: Typically, when performing SRS-based channel measurements, the number of configured SRS ports equals the number of terminal antenna ports. To further reduce SRS resource overhead, the spatial correlation between different antenna ports can be utilized to measure only a portion of the antenna ports, and the channel information for the other antenna ports can be predicted or extrapolated using the channel correlation matrix.

[0125] For example, taking a terminal device with 8 antenna ports as an example, the corresponding channel matrix is ​​H = [H1 H2 … H8]. Where H... k This represents the channel vector corresponding to the k-th antenna port (k = 1, 2, ..., 8). To obtain measurements of the channels corresponding to all antenna ports, an SRS resource with 8 SRS ports needs to be configured, with each SRS port corresponding to one antenna port.

[0126] To reduce SRS overhead, in one implementation, the terminal device can be configured with SRS resources containing only four SRS ports. As shown in Figure 2, the four SRS ports of this SRS resource correspond to antenna ports 1, 3, 5, and 7, respectively. Furthermore, by utilizing the correlation between antenna ports 2, 4, 6, and 8 and the channels corresponding to antenna ports 1, 3, 5, and 7, the channel matrix of the eight antennas can be estimated using the following formula: H8 = R 8×4 (R 4×4 +σ 2 I) -1 H4

[0127] Where H8 represents the channel matrix corresponding to the 8 antenna ports, and H4 represents the channel matrix corresponding to the 4 antenna ports obtained through SRS measurement. 8×4 R represents the cross-correlation matrix between the channels corresponding to the 8 antenna ports and the channels corresponding to the 4 antenna ports of the SRS. 4×4 This represents the autocorrelation matrix of the channel corresponding to the four antenna ports of the SRS. Where R... 8×4 The four antenna ports corresponding to SRS are related to which of the eight antenna ports.

[0128] By measuring the SRS ports in the airspace as described above, the number of SRS transmitting ports can be effectively reduced, thus lowering SRS resource overhead. The saved SRS resources can be used for channel measurements or data transmission in other terminal devices, thereby improving system performance.

[0129] The above briefly introduces the scenario to which the communication method provided by the embodiments of the present application can be applied, and introduces the basic concepts that can be involved in the embodiments of the present application, and introduces the codebook-based PUSCH transmission and the spatial domain partial SRS port measurement in the basic concepts. It can be known from the above introduction of the codebook-based PUSCH transmission that the PUSCH port and the SRS port are one-to-one corresponding, that is, the transmitting antenna port corresponding to the PUSCH port and the transmitting antenna port corresponding to the associated SRS port are the same. Therefore, for the N port PUSCH transmission, N port SRS resources need to be configured or associated. The following disadvantages and deficiencies exist:

[0130] 1) The number of associated SRS resource ports is large, especially as the terminal antenna scale improves, the number of SRS ports that need to be measured is multiplied, thereby causing the SRS resource overhead to be multiplied, affecting the system performance.

[0131] 2) Under the limited terminal transmitting power, the SRS transmitting power is divided by the corresponding N ports, so the more the number of transmitting ports is, the lower the effective transmitting power of each port is, thereby affecting the channel measurement quality.

[0132] However, when the spatial domain partial SRS port measurement is adopted, since only part of the SRS ports need to be transmitted, the following defects still exist:

[0133] 1) The terminal device maps the terminal antenna port on the SRS port and the associated PUSCH port by self-implementation, when only part of the SRS ports are transmitted, the terminal device cannot know which ports do not need to be transmitted.

[0134] 2) When only part of the SRS ports are transmitted, the number of PUSCH ports and the number of SRS ports are not aligned, and in the existing standard, the SRS port and the PUSCH port are one-to-one corresponding, so the association relationship between the PUSCH port and the SRS port cannot be known.

[0135] 3) The number of PUSCH ports and the number of SRS ports are different, under the given terminal device transmitting power, the effective power of each PUSCH port and SRS port is not aligned, which will cause the difference in the power coefficient between the SRS-based channel measurement result and the channel corresponding to the PUSCH.

[0136] In order to solve the problems existing in the above codebook-based uplink PUSCH transmission, the present application provides a communication method to reduce the resource overhead of the uplink reference signal.

[0137] The communication method provided by the embodiments of the present application can be applied to a system communicating through a multi-antenna technology, for example, the communication system 100 shown in FIG. 1. The communication system can include at least one network device and at least one terminal device.

[0138] The embodiments shown below do not particularly limit the specific structure of the subject performing the method provided by the embodiments of the present application, as long as the subject can communicate according to the method provided by the embodiments of the present application by running a program in which the code of the method provided by the embodiments of the present application is recorded. For example, the method provided by the embodiments of the present application can be performed by a first communication device, and in the case where no special description is made, the "first communication device" in the present application can refer to the first communication device itself (for example, a network device), a component (for example, a processor, a chip, or a chip system, etc.) in the first communication device, or a logic module or software capable of realizing all or part of the functions of the first communication device. For another example, the method provided by the embodiments of the present application can be performed by a second communication device, and in the case where no special description is made, the "second communication device" in the present application can refer to the second communication device itself (for example, a terminal device), a component (for example, a processor, a chip, or a chip system, etc.) in the second communication device, or a logic module or software capable of realizing all or part of the functions of the second communication device.

[0139] FIG. 3 is a schematic flowchart of a communication method provided by an embodiment of the present application, including the following steps:

[0140] S310, the second communication device sends a reference signal to the first communication device, and correspondingly, the first communication device receives the reference signal from the second communication device.

[0141] Specifically, the reference signal corresponds to P reference signal ports. The second communication device sends the reference signal through P antenna ports respectively associated with the P reference signal ports on time-frequency resources corresponding to the P reference signal ports. The P reference signal ports and the P antenna ports are in one-to-one correspondence, and P is a positive integer.

[0142] In this embodiment, the second communication device is a device with N antenna ports, N is a positive integer, and P described above is a positive integer less than N. The antenna port can also be referred to as a second communication device antenna port or a terminal antenna port. Each of the N antenna ports can correspond to a physical transmitting antenna of the second communication device, or can correspond to a virtual port, which is not limited in the present application. In order to facilitate the description below, the antenna port can be taken as an example of a terminal antenna port, for example, the second communication device is a terminal device with N terminal antenna ports, and the first communication device can be a network device communicating with the terminal device.

[0143] Optionally, the reference signal in this embodiment can be the SRS shown in the foregoing, or can also be other reference signals or pilots that can be used for uplink channel measurement. The specific form of the reference signal in this embodiment is not limited, for example, the reference signal in this embodiment can also be an uplink reference signal such as a tracking reference signal (TRS) or a phase tracking reference signal (PTRS).

[0144] For the convenience of description, the reference signal in the following description can be taken as an example of the SRS. The reference signal port can be referred to as an SRS port, and the reference signal resource can be referred to as an SRS resource. When the reference signal is a signal of other forms, the description of the reference signal as the SRS can be referred to, and the description will not be repeated.

[0145] For example, the second communication device sends the capability information to the first communication device, and the capability information is used to indicate the number of antenna ports of the second communication device. For example, the second communication device sends the capability information to the first communication device, and the capability information is used to indicate that the number of antenna ports of the second communication device is N = 8. The first communication device can know that the number of uplink data ports can be N = 8 when scheduling the second communication device to perform codebook-based uplink data transmission based on the capability information.

[0146] As can be seen from the foregoing, in this embodiment, the number of reference signal ports through which the second communication device transmits the reference signal is P, which is less than the number of antenna ports N of the second communication device. As an example but not limitation, the first communication device can indicate the P reference signal ports (or P antenna ports) through which the second communication device transmits the reference signal in the following ways:

[0147] Method one: The first communication device indicates the P reference signal ports through which the reference signal is transmitted by using the first indication information.

[0148] In the case shown in method one, the method flow shown in FIG. 3 includes the following steps:

[0149] S311, the first communication device sends the first indication information to the second communication device, and correspondingly, the second communication device receives the first indication information from the first communication device.

[0150] Specifically, the first indication information indicates P reference signal ports in N reference signal ports corresponding to the first reference signal resource. The first reference signal resource is one of at least one reference signal resource configured by the first communication device for the second communication device, each of the at least one reference signal resource corresponds to N reference signal ports, the N reference signal ports one-to-one correspond to N antenna ports, and the N reference signal ports one-to-one correspond to N data ports.

[0151] Optionally, the corresponding reference signal port and the data port correspond to the same antenna port. For example, each SRS port is associated with one antenna port, and N data ports corresponding to uplink data (such as PUSCH) one-to-one correspond to N antenna ports of the second communication device. If each SRS port is associated with N antenna ports, the terminal antenna port associated with the data port k is the same as the terminal antenna port associated with the SRS port k (k = 0, 1, …, N-1). It should be understood that the specific mapping and association mode of the SRS port and the antenna port are terminal implementation behaviors, and the present application does not make any limitation.

[0152] Exemplarily, the first communication device sends configuration information #1 to the second communication device, and the configuration information #1 is used to configure at least one reference signal resource, and each reference signal resource corresponds to N reference signal ports. The first indication information described above can be carried in the configuration information #1, or the first indication information and the configuration information #1 can be transmitted independently.

[0153] As a possible implementation manner, the first indication information indicates P reference signal ports in N reference signal ports corresponding to the first reference signal resource, which are used to send reference signals.

[0154] As another possible implementation manner, the first indication information indicates Q reference signal ports in N reference signal ports corresponding to the first reference signal resource, which are not used to send reference signals, and the Q reference signal ports are reference signal ports other than the P reference signal ports in the N reference signal ports.

[0155] Optionally, in the embodiment, the first indication information indicates the SRS ports actually transmitted or not transmitted in the N SRS ports corresponding to the resource of a certain SRS, including but not limited to the following possible implementation manners:

[0156] As a possible implementation manner, the first indication information can be a bitmap containing N bits, and each bit corresponds to one SRS port in the N SRS ports.

[0157] Optionally, the kth bit in the bitmap is 1, indicating that the kth SRS port is a port actually transmitting SRS; or the kth bit in the bitmap is 0, indicating that the kth SRS port is a port not transmitting SRS. Alternatively, the kth bit in the bitmap is 1, indicating that the kth SRS port is a port actually not transmitting SRS; or the kth bit in the bitmap is 0, indicating that the kth SRS port is a port transmitting SRS.

[0158] For example, when N = 8, the first indication information can be "11101010" in bitmap, indicating that the actually transmitting SRS ports are ports 0, 1, 2, 4 and 6, or the actually not transmitting SRS ports are ports 3, 5 and 7. The second communication device can determine to transmit SRS using the antenna ports corresponding to the SRS ports 0 / 1 / 2 / 4 / 6 based on the first indication information.

[0159] As another possible implementation, the first indication information can indicate the actually transmitting or not transmitting SRS ports in the N SRS ports by identifying the transmission mode.

[0160] Optionally, the first indication information is an identification (ID) of a mode, the ID identifying a combination mode of SRS ports, different combination modes corresponding to different actually transmitting or not transmitting SRS ports. The identification of the mode can be a combination number mode, such as selecting P reference signal ports from N reference signal ports, a total of bits are needed to indicate the combination mode.

[0161] For example, when N = 8, the combination modes of the ports include X modes, each combination mode corresponding to an identification, wherein the combination mode with an identification of 0 in the X combination modes indicates that the actually transmitting SRS ports are ports 0, 1, 2, 4 and 6, and the combination mode with an identification of 1 indicates that the actually transmitting SRS ports are ports 3, 5 and 7. If the first indication information indicates the identification of 0, it indicates that the actually transmitting SRS ports are ports 0, 1, 2, 4 and 6, and the terminal device can transmit corresponding SRS signals using the antenna ports corresponding to the SRS ports 0, 1, 2, 4 and 6.

[0162] As yet another possible implementation, the first indication information can directly indicate the indexes of the P reference signal ports used for transmission or the Q reference signal ports not used for transmission.

[0163] ​​Optionally, the first indication information is an ID of the port, and the ID is used to identify the port.

[0164] For example, when N=8, the indexes of the SRS ports corresponding to the 8 antenna ports are 0, 1, 2, 3, 4, 5, 6 and 7 respectively. If the first indication information indicates the SRS ports with indexes 0, 1, 2, 4 and 6, and the first indication information indicates the actually transmitted SRS ports, the terminal device can transmit corresponding SRS signals by using the antenna ports corresponding to the SRS ports 0, 1, 2, 4 and 6.

[0165] It should be understood that the above-mentioned possible forms of the first indication information are only examples and do not limit the protection scope of the present application, and other ways of indicating the actually transmitted or not transmitted SRS ports in the N SRS ports corresponding to the indicated SRS resources are also within the protection scope of the present application, which will not be illustrated one by one here.

[0166] Further, for the actually transmitted SRS port, the second communication device transmits the signal corresponding to the SRS port by using the antenna port associated with the SRS port in the time-frequency resource corresponding to the SRS port.

[0167] In order to facilitate understanding, the way of indicating the P reference signal ports by the first communication device for transmitting the reference signals will be introduced in detail in the case shown in FIG. 4.

[0168] As shown in FIG. 4, the number of antenna ports of the second communication device is 8 (for example, the 8 antenna ports with indexes 0-7 shown in FIG. 4), and the 8 antenna ports correspond to 8 data ports one by one (for example, the 8 data ports corresponding to PUSCH shown in FIG. 4). The first communication device indicates 5 SRS ports actually used for transmitting the reference signals by using the first indication information (for example, the bit pattern 11101010 shown in FIG. 4 indicates that the 5 SRS ports corresponding to the 5 antenna ports with indexes 0, 1, 2, 4 and 6 are actually used for transmitting the reference signals).

[0169] In addition, the time-frequency resources of the reference signal resource mapping, the periods of the SRS resources corresponding to the 8 SRS ports and the 5 SRS ports, the transmission power Psrs of the SRS ports on different time domain units and the like are also shown in FIG. 4, which will be described in detail below in combination with the specific indication information, and will not be described here.

[0170] Way two: the first communication device configures a resource group including multiple SRS resources by using the first configuration information, and there are SRS resources corresponding to P SRS ports in the multiple SRS resources in each resource group, and the P reference signal ports corresponding to the SRS resources are the above-mentioned P reference signal ports for transmitting the reference signals.

[0171] In the case shown in Mode Two, the method flow shown in FIG. 3 includes the following steps:

[0172] S312, the first communication device sends the first configuration information to the second communication device, and correspondingly, the second communication device receives the first configuration information from the first communication device.

[0173] Specifically, the first configuration information is used to configure at least one reference signal resource group, each reference signal resource group includes a plurality of reference signal resources, a first reference signal resource in the plurality of reference signal resources corresponds to P reference signal ports, a second reference signal resource in the plurality of reference signal resources corresponds to N reference signal ports, the N reference signal ports one-to-one correspond to N antenna ports, and the N reference signal ports one-to-one correspond to N data ports.

[0174] For example, the first communication device sends SRS configuration information to the second communication device, the SRS configuration information is used to configure one or more SRS resource groups for the second communication device, each SRS resource group contains 2 SRS resources, which are SRS resource 1 and SRS resource 2. The SRS resource 1 corresponds to N SRS ports, and the SRS resource 2 corresponds to the actually transmitted P SRS ports, wherein P is a positive integer less than N.

[0175] Optionally, each SRS port is associated with an antenna port, and the N data ports corresponding to the uplink data (such as PUSCH) one-to-one correspond to the N SRS ports of the SRS resource. The terminal antenna port associated with the data port k is the same as the terminal antenna port associated with the SRS port k (k = 0, 1, …, N-1). It should be understood that the specific mapping and association mode of the N SRS ports and the antenna ports are terminal implementation behaviors, and the present application does not make any limitation.

[0176] Further, in the case shown in Mode Two, the first communication device can indicate the P reference signal ports corresponding to the N reference signal ports corresponding to the second reference signal resource in the second indication information to the second communication device, and then the method flow shown in FIG. 3 further includes:

[0177] S313, the first communication device sends the second indication information to the second communication device, and correspondingly, the second communication device receives the second indication information from the first communication device.

[0178] Specifically, the second indication information is used to indicate that each of the P reference signal ports corresponding to the first reference signal resource is associated with one of the N reference signal ports corresponding to the second reference signal resource. Since the N reference signal ports corresponding to the second reference signal resource are one-to-one corresponding to the N antenna ports and one-to-one corresponding to the N data ports, the P antenna ports and the P data ports corresponding to the P reference signal ports corresponding to the first reference signal resource can be indicated by the second indication information. Thus, the association between the N data ports and the N antenna ports can be effectively determined in the case of transmitting reference signals through part of the antenna ports.

[0179] For example, SRS ports 0-7 in SRS resource 1 correspond to antenna ports 0-7 respectively, and SRS ports 0-3 in SRS resource 2 correspond to SRS ports 0, 2, 4 and 6 in SRS resource 1 respectively, which means that when transmitting reference signals through the SRS ports corresponding to SRS resource 2, antenna ports 0, 2, 4 and 6 are used for transmission.

[0180] Optionally, among the reference signal ports corresponding to the first reference signal resource and the second reference signal resource, the associated reference signal ports correspond to the same antenna port. For example, SRS ports 0-7 in SRS resource 1 correspond to antenna ports 0-7 respectively, and SRS ports 0-3 in SRS resource 2 correspond to SRS ports 0, 2, 4 and 6 in SRS resource 1 respectively, which means that SRS ports 0, 2, 4 and 6 in SRS resource 1 and SRS ports 0, 2, 4 and 6 in SRS resource 2 correspond to the same antenna port, wherein SRS port 0 in SRS resource 1 and SRS port 0 in SRS resource 2 correspond to the same antenna port, SRS port 2 in SRS resource 1 and SRS port 2 in SRS resource 2 correspond to the same antenna port, SRS port 4 in SRS resource 1 and SRS port 4 in SRS resource 2 correspond to the same antenna port, and SRS port 6 in SRS resource 1 and SRS port 6 in SRS resource 2 correspond to the same antenna port.

[0181] The second indication information described above can be carried in the first configuration information, or the second indication information and the first configuration information can be transmitted independently.

[0182] For ease of understanding, the manner in which the first communication device indicates the P reference signal ports for transmitting reference signals in the case shown in Mode Two will be described in detail in conjunction with FIG. 5.

[0183] As shown in FIG. 5, the number of antenna ports of the second communication device is 8 (a total of 8 antenna ports with indexes 0-7 as shown in FIG. 5), and the 8 antenna ports correspond to 8 data ports (8 data ports corresponding to PUSCH as shown in FIG. 5) one by one. The first communication device configures at least one reference signal resource group through the first configuration information, and each reference signal resource group includes a plurality of reference signal resources, such as the SRS resource group configuration shown in FIG. 5, including SRS resource 1 and SRS resource 2, wherein SRS resource 1 corresponds to 8 SRS ports, and SRS resource 2 corresponds to 4 SRS ports actually transmitted, which are denoted as P0, P1, P2, and P3.

[0184] Further, each SRS port is associated with an antenna port. As shown in FIG. 5, the 8 SRS ports corresponding to SRS resource 1 correspond to the 8 antenna ports one by one, and in addition, the first communication device can indicate through the second indication information that the 4 SRS ports corresponding to SRS resource 2 are associated with 4 of the 8 SRS ports corresponding to SRS resource 1, for example, P0 is associated with SRS port 0 of SRS resource 1, P1 is associated with SRS port 2 of SRS resource 1, P2 is associated with SRS port 4 of SRS resource 1, and P3 is associated with SRS port 6 of SRS resource 1, so that the 4 SRS ports corresponding to SRS resource 2 are respectively associated with 4 of the 8 antenna ports (antenna ports 0, 2, 4, and 6 as shown in FIG. 5).

[0185] In addition, the time-frequency resources of the reference signal resource mapping, the periods of the SRS resources corresponding to the 8 SRS ports and the 5 SRS ports, the transmission power Psrs of the SRS ports on different time-domain units, etc. are also shown in FIG. 5, which will be described in combination with specific indication information below, and will not be described here.

[0186] Optionally, in the cases shown in the above-mentioned mode one and mode two, the first communication device can further indicate the first period and the second period through the third indication information, wherein the first period is the transmission period of the reference signal resource corresponding to the N reference signal ports, and the second period is the transmission period of the reference signal resource corresponding to the P reference signal ports.

[0187] Optionally, the third indication information is used for a first ratio, and the first ratio is the ratio of the first period to the second period, or the first ratio is the ratio of the second period to the first period.

[0188] For example, for the above-mentioned mode one, the third indication information indicates the transmission period corresponding to the SRS resource of the N SRS ports and the SRS resource actually using the P SRS ports.

[0189] In an implementation, the third indication information can indicate a transmission period T corresponding to the SRS resources of the N SRS ports N_port For example, 5 ms, 10 ms, 20 ms, or 80 ms, further indicating a transmission period T corresponding to the SRS resources of the P SRS ports P_port and a proportion coefficient of the transmission period T of the N SRS ports N_port For example, 5 ms, 10 ms, 20 ms, or 80 ms, further indicating a transmission period T corresponding to the SRS resources of the P SRS ports

[0190] For example, the first communication device indicates through the third indication information that the period corresponding to the SRS resources of the N SRS ports is 20 ms, and indicates which means that in the SRS resource transmission process, the SRS resources of the N SRS ports are transmitted once every 20 ms, and the SRS resources of the P SRS ports are transmitted once every 5 ms. That is, in the transmission period of 20 ms, the SRS resources of the N SRS ports are transmitted once and the SRS resources of the P SRS ports are transmitted 3 times.

[0191] For example, the first communication device indicates through the third indication information that the period corresponding to the SRS resources of the P SRS ports is 5 ms, and indicates which means that in the SRS resource transmission process, the SRS resources of the N SRS ports are transmitted once every 20 ms, and the SRS resources of the P SRS ports are transmitted once every 5 ms. That is, in the transmission period of 20 ms, the SRS resources of the N SRS ports are transmitted once and the SRS resources of the P SRS ports are transmitted 3 times.

[0192] For ease of understanding, in combination with the above-mentioned FIG. 4, the SRS resources of the N SRS ports and the actual transmitted reference signals are the SRS resources of the P SRS ports, which are periodically transmitted, as shown in FIG. 4, if N=8 and P=4, the third indication information can indicate that every time the SRS resources of 8 SRS ports are transmitted, the SRS resources of 5 SRS ports are transmitted (α-1) times.

[0193] For example, for the above-mentioned mode two, the third indication information indicates the transmission periods corresponding to the SRS resources of the N SRS ports and the SRS resources of the P SRS ports in a certain resource group, respectively.

[0194] In an implementation, the third indication information can indicate a transmission period T corresponding to the SRS resources 1 of the N SRS ports N_port For example, 5 ms, 10 ms, 20 ms, or 80 ms, further indicating a transmission period T corresponding to the SRS resources 2 of the P SRS ports P_port and a proportion coefficient of the transmission period T of the N SRS ports N_port For example, 5 ms, 10 ms, 20 ms, or 80 ms, further indicating a transmission period T corresponding to the SRS resources of the P SRS ports

[0195] For example, the first communication device indicates through the third indication information that the period corresponding to the N SRS port SRS resource 1 is 20 ms, and indicates That is, in the SRS resource sending process, for at least one resource group configured by the first configuration information, the N SRS port SRS resource 1 is sent once every 20 ms, and the P SRS port SRS resource 2 is sent once every 5 ms.

[0196] Also, for example, the first communication device indicates through the third indication information that the period corresponding to the P SRS port SRS resource 2 is 5 ms, and indicates That is, in the SRS resource sending process, for at least one resource group configured by the first configuration information, the N SRS port SRS resource 1 is sent once every 20 ms, and the P SRS port SRS resource 2 is sent once every 5 ms.

[0197] For ease of understanding, in combination with the above-mentioned FIG. 5, the N SRS port SRS resource and the actual sending reference signal are the P SRS port SRS resource period, as shown in FIG. 4, if N = 8 and P = 4, the third indication information can be used to indicate that every time 8 SRS port SRS resources are sent, (a-1) times 4 SRS port SRS resources are sent.

[0198] That is, the third indication information is used to indicate the sending period of different SRS resources, for example, the N SRS port SRS resource can be sent once and the P SRS port SRS resource can be sent multiple times in a 20 ms sending period. In this way, full-port SRS resources (such as the above-mentioned N SRS port SRS resource) and partial-port SRS resources (such as the above-mentioned P SRS port SRS resource) can be measured together. For example, full-port SRS resource long-period measurement is used to obtain the correlation coefficient or correlation matrix between antenna ports, which is used for channel interpolation or filtering between antenna ports. Partial-port SRS resource short-period measurement can reduce SRS resource overhead.

[0199] Method three: the first communication device configures at least one reference signal resource through the second configuration information, and each reference signal resource in the at least one reference signal resource corresponds to the P reference signal ports of the above-mentioned sending reference signal.

[0200] In the case shown in method three, the method flow shown in FIG. 3 includes the following steps:

[0201] S314, the first communication device sends the second configuration information to the second communication device, and correspondingly, the second communication device receives the second configuration information from the first communication device.

[0202] Specifically, the second configuration information is used to configure at least one reference signal resource, each reference signal resource corresponds to P reference signal ports, and the P reference signal ports are associated with P antenna ports of the N antenna ports of the second communication device.

[0203] Further, in the case shown in the third mode, the first communication device can indicate, through the fourth indication information, that each reference signal port in the P reference signal ports corresponding to each reference signal resource is associated with one data port in the N data ports corresponding to the data, and then the method flow shown in FIG. 3 further includes:

[0204] S315, the first communication device sends the fourth indication information to the second communication device, and correspondingly, the second communication device receives the fourth indication information from the first communication device.

[0205] Specifically, the fourth indication information is used to indicate that each reference signal port in the P reference signal ports corresponding to each reference signal resource is associated with one data port in the N data ports. Since the N data ports correspond one-to-one to the N antenna ports, the P antenna ports corresponding to the P reference signal ports corresponding to the reference signal resource and the P data ports can be indicated through the fourth indication information. Thus, in the case of transmitting reference signals through part of the antenna ports, the association relationship between the N data ports and the N antenna ports can still be effectively determined.

[0206] For example, SRS ports 0-3 in the SRS resource correspond to data ports 0, 2, 4, and 6 respectively, which means that when the SRS ports corresponding to the SRS resource transmit reference signals, the corresponding antenna ports 0, 2, 4, and 6 corresponding to the data ports 0, 2, 4, and 6 are used for transmission.

[0207] Alternatively, the associated reference signal ports and data ports correspond to the same antenna port. For example, SRS ports 0-3 in the SRS resource correspond to data ports 0, 2, 4, and 6, respectively, and SRS ports 0, 1, 2, and 3 in the SRS resource and data ports 0, 2, 4, and 6 correspond to the same antenna port, wherein SRS port 0 in the SRS resource and data port 0 correspond to the same antenna port, SRS port 1 in the SRS resource and data port 2 correspond to the same antenna port, SRS port 2 in the SRS resource and data port 4 correspond to the same antenna port, and SRS port 3 in the SRS resource and data port 6 correspond to the same antenna port.

[0208] The fourth indication information can be carried in the second configuration information, or the fourth indication information and the second configuration information can be independently transmitted.

[0209] For ease of understanding, the first communication device indicates the P reference signal ports of the reference signal in the case shown in mode three will be introduced in detail in combination with FIG. 6.

[0210] As shown in FIG. 6, the number of antenna ports of the second communication device is 8 (for example, a total of 8 antenna ports with indexes 0-7 shown in FIG. 6), and the 8 antenna ports correspond to 8 data ports one by one (for example, 8 data ports corresponding to PUSCH shown in FIG. 6). The first communication device configures at least one reference signal resource through the second configuration information, each reference signal resource corresponds to P reference signal ports, for example, the SRS resource shown in FIG. 6 corresponds to P=4 SRS ports.

[0211] Further, the fourth indication information can be used to indicate that each SRS port is associated with one data port. As shown in FIG. 6, the 4 SRS ports in the SRS resource correspond to data ports 0, 2, 4 and 6 respectively.

[0212] In addition, the time-frequency resources of the reference signal resource mapping, the transmission power Psrs of the SRS port on different time domain units and the like are also shown in FIG. 6, which will be described in combination with specific indication information below, and will not be described here.

[0213] It should be noted that the above-mentioned modes one to three are used to illustrate how the first communication device indicates to the second communication device to use part of the N antenna ports to transmit the reference signal, which does not constitute any limitation on the protection scope of the present application. The first communication device in the present application can also indicate the above-mentioned P reference signal ports through other modes, for example, the protocol predefines the determination mode of part of the ports, and the antenna ports used in different transmission situations can be specified by the protocol.

[0214] For example, the first communication device can also send at least one of the following information to the second communication device: information indicating that the function of the reference signal resource is codebook-based transmission, information indicating the time-frequency resources of the reference signal resource mapping, information indicating the transmission period of the reference signal resource, or information indicating the sequence corresponding to the reference signal.

[0215] As an example but not limitation, the above-mentioned information indicating the function of the SRS resource, the mapping of the time-frequency resource, or the sequence can be carried in the configuration information.

[0216] Optionally, for the above-mentioned manner one, the configuration information #1 can also indicate that the function of the resource of the at least one SRS is codebook-based transmission (codebook). Alternatively, the first communication device can also indicate that the function of the resource of the at least one SRS is codebook through other information.

[0217] For example, the configuration information #1 includes information #1 indicating that the usage of the SRS resource configured by the configuration information #1 is codebook. Also for example, the information #1 is information independent of the configuration information #1, and the first communication device can indicate that the usage of the SRS resource configured by the configuration information #1 is codebook through the information #1.

[0218] Optionally, the above-mentioned configuration information #1 can also indicate the time-frequency resource, transmission period, or corresponding reference signal sequence, etc. of the resource mapping of each SRS. Alternatively, the first communication device can also indicate the characteristics of each SRS in the resource of the at least one SRS through other information other than the configuration information #1.

[0219] For example, the configuration information #1 includes information #2 indicating that the N SRS ports corresponding to each SRS in the resource of the at least one SRS configured by the configuration information #1 can be mapped within one OFDM symbol or within continuous multiple OFDM symbols.

[0220] Also for example, the configuration information #1 includes information #3 indicating that the ports mapped within the same OFDM symbol correspond to different frequency domain subcarriers (frequency domain comb) or SRS sequence cyclic shift (CS).

[0221] It should be understood that the above-mentioned information #2 and information #3 can be information independent of the configuration information #1, and the first communication device can indicate the information of the SRS resource configured by the configuration information #1 through the information #2 and information #3.

[0222] For the convenience of understanding, in combination with the above-mentioned FIG. 4, how the first communication device indicates the SRS resource function, period, time-frequency resource, or sequence, etc. information is described in connection with the above-mentioned manner one.

[0223] As shown in FIG. 4, for N=8 SRS port SRS resource, 8 SRS ports can be indicated to be mapped within 2 OFDM symbols (such as OFDM symbol 1 and OFDM symbol 2 shown in FIG. 4) through the configuration information #1, each OFDM symbol corresponds to 4 SRS ports, and 4 SRS ports are mapped on the same subcarrier, and orthogonality or low mutual interference is realized through different SRS sequences (cyclic shift).

[0224] For example, SRS ports 0~3 are mapped in OFDM symbol 1, corresponding to cyclic shifts 0, 2, 4 and 6. SRS ports 4~7 are mapped in OFDM symbol 2, corresponding to cyclic shifts 0, 2, 4 and 6. Based on the configuration information #1, 3 SRS ports, i.e., SRS ports 0, 1 and 2, are actually transmitted in OFDM symbol 1, and 2 SRS ports, i.e., SRS ports 4 and 6, are actually transmitted in OFDM symbol 2.

[0225] Optionally, for the above-described manner two, the first configuration information can further indicate time-frequency resources mapped by each SRS resource, a transmission period, and a corresponding SRS sequence, etc. Alternatively, the first communication device can further indicate information of each SRS resource in the at least one SRS resource group through other information than the first configuration information.

[0226] For example, the first configuration information described above includes information #4, which indicates that usage of the SRS resource group configured by the first configuration information is codebook. For another example, the information #4 is information independent of the first configuration information, and the first communication device can indicate that usage of the SRS resource group configured by the first configuration information is codebook through the information #4.

[0227] Optionally, the first configuration information described above can further indicate time-frequency resources mapped by each SRS resource, a transmission period, or a corresponding reference signal sequence, etc. Alternatively, the first communication device can further indicate information of each SRS resource in the at least one SRS resource group through other information than the first configuration information.

[0228] For example, the first configuration information described above includes information #5, which indicates that SRS resources corresponding to N SRS ports configured by the first configuration information can be mapped within one OFDM symbol or within multiple consecutive OFDM symbols.

[0229] For another example, the first configuration information described above includes information #6, which indicates that ports mapped within the same OFDM symbol correspond to different frequency domain subcarriers (frequency domain combs) or SRS sequence cyclic shifts.

[0230] It should be understood that the information #5 and the information #6 described above can be information independent of the first configuration information, and the first communication device can indicate information of the SRS resource configured by the first configuration information through the information #5 and the information #6.

[0231] For the convenience of understanding, the first communication device how to indicate information of SRS resource functions, periods, time-frequency resources, or sequences, etc. is described in combination with the above-described FIG. 5 for the above-described manner two.

[0232] As shown in FIG. 5, for SRS resource 2 with P = 4 SRS ports, 4 ports are mapped in 1 OFDM symbol, 4 SRS ports are mapped in the same subcarriers, and orthogonality or low mutual interference is achieved through different SRS sequences (cyclic shifts). For example, 4 SRS ports 0-3 are mapped in OFDM symbol 1, corresponding to cyclic shifts 0, 2, 4, and 6.

[0233] Optionally, for the third mode described above, the second configuration information indicates that the function of the SRS resource is codebook. Alternatively, the first communication device can also indicate that the function of the at least one SRS resource is codebook through other information.

[0234] For example, the second configuration information described above includes information #7, which indicates that the usage of the SRS resource configured by the second configuration information is codebook. For another example, information #7 is information independent of the second configuration information, and the first communication device can indicate that the usage of the SRS resource configured by the second configuration information is codebook through information #7.

[0235] Optionally, the second configuration information described above can also indicate the time-frequency resource, transmission period, or corresponding reference signal sequence of each SRS resource, etc. Alternatively, the first communication device can also indicate the characteristics of each SRS resource in the at least one SRS resource through other information in addition to the second configuration information.

[0236] For example, the network device configures the number of PUSCH ports as N = 8 and configures the SRS resource to contain SRS ports P = 4. The 4 SRS ports of the configured SRS resource can be mapped in one OFDM symbol, corresponding to different frequency domain subcarriers (frequency domain comb) or SRS sequence cyclic shifts.

[0237] For ease of understanding, in combination with the above-mentioned FIG. 6, how the first communication device indicates the SRS resource function, period, time-frequency resource, or sequence information is described for the second mode described above.

[0238] As shown in FIG. 6, for SRS resource with P = 4 SRS ports, 4 SRS ports are mapped in 1 OFDM symbol, 4 SRS ports are mapped in the same subcarriers, and orthogonality or low mutual interference is achieved through different SRS sequences (cyclic shifts). For example, ports 0-3 are mapped in OFDM symbol 1, corresponding to cyclic shifts 0, 2, 4, and 6.

[0239] Exemplarily, in a case that the P reference signal ports are mapped in one time domain unit, a transmission power corresponding to each of the P reference signal ports is a ratio of a transmission power of the second communication device to the P, and a transmission power corresponding to each of the N data ports is a ratio of the transmission power of the second communication device to the N.

[0240] The transmission power corresponding to the reference signal port can be understood as a transmission power corresponding to a reference signal transmitted by the reference signal port. For example, a transmission power corresponding to each of the P reference signals is a ratio of a transmission power of the second communication device to the P.

[0241] Optionally, for a transmission power of the second communication device being P0, a transmission power corresponding to each of the SRS ports is a ratio of the transmission power P0 to a number of SRS ports actually transmitted in an OFDM symbol.

[0242] For example, as shown in FIG. 4, a number of SRS ports actually transmitted in the OFDM symbol 1 is 3, and a transmission power corresponding to each of the SRS ports is P0 / 3. A number of SRS ports actually transmitted in the OFDM symbol 2 is 2, and a transmission power corresponding to each of the SRS ports is P0 / 2.

[0243] For another example, as shown in FIG. 5 and FIG. 6, a transmission power corresponding to each of the SRS ports is P0 / 4.

[0244] Exemplarily, after the second communication device receives the reference signal, the second communication device can perform channel measurement, and the method shown in FIG. 3 can further include:

[0245] S320, the first communication device performs channel measurement.

[0246] Specifically, the first communication device can determine channel information corresponding to N antenna ports of the second communication device according to the received reference signal, the N antenna ports correspond to the N data ports one by one, the N data ports are used for transmitting data, and the data is data transmitted by the second communication device to the first communication device. The data can be referred to as uplink data.

[0247] Optionally, for the above-mentioned manner one, after receiving the SRS sent by the P reference signal ports, the first communication device can obtain the channel information corresponding to the antenna port of the SRS not sent by measuring the spatial correlation matrix obtained by the full-port SRS resource. In the case shown by the manner one, the association between the N antenna ports and the N data ports is established by the SRS resource of the N SRS ports. Further, by indicating part of the SRS ports to send or not to send through the first indication information, it is equivalent to indicating part of the antenna ports of the second communication device not to send the SRS for channel measurement, so as to still guarantee the association between the N data ports and the N antenna ports in the case that the number of the data ports and the number of the SRS ports actually sending the reference signal are not equal.

[0248] Optionally, for the above-mentioned manner two, after receiving the SRS sent by the P reference signal ports corresponding to the SRS resource 2, the first communication device can obtain the channel information corresponding to the antenna port of the SRS not sent by measuring the spatial correlation matrix obtained by the full-port SRS resource 1. In the case shown by the manner two, the association between the N antenna ports and the N data ports is established by configuring the resource group including multiple SRS resources (such as the SRS resource 1 of the N SRS ports and the SRS resource 2 of the P SRS ports). Further, by the SRS resource 2 corresponding to the P SRS ports, it is implicitly indicated that part of the antenna ports of the second communication device do not send the SRS for channel measurement, so as to still guarantee the association between the N data ports and the N antenna ports in the case that the number of the data ports and the number of the SRS ports actually sending the reference signal are not equal.

[0249] Optionally, for the above-mentioned manner three, after receiving the SRS sent by the P reference signal ports corresponding to the SRS resource, the first communication device can obtain the channel information corresponding to the antenna port of the SRS not sent by measuring the spatial correlation matrix obtained by other measurement means. For example, the first communication device can obtain the channel correlation matrix between the N antenna ports by sending the SRS resource of the N reference signal ports, where the sending period of the SRS resource of the N reference signal ports can be greater than the sending period of the SRS resource of the P reference signal ports; for another example, the first communication device can obtain the channel correlation matrix between the antenna ports by the downlink reference signal CSI-RS by using the TDD system uplink-downlink channel reciprocity, and the second communication device feeds back the channel correlation matrix between the antenna ports obtained by the first communication device; for another example, the first communication device can measure by other reference signals; for another example, the first communication device can obtain the channel correlation matrix information between the antenna ports by the maintained channel knowledge graph.

[0250] In the case shown in Mode 3, the association between the N antenna ports and the N data ports is established. For example, the protocol directly defines that the N antenna ports correspond to the N data ports one by one. Further, by configuring the SRS resource corresponding to the P reference signal ports, it is implicitly indicated that part of the antenna ports of the second communication device do not send SRS for channel measurement, so that in the case where the number of SRS ports actually sending reference signals and the number of data ports are not equal, the association between the N data ports and the N antenna ports is still guaranteed.

[0251] In the communication method shown in FIG. 3, the first communication device can determine the channel information corresponding to the N antenna ports of the second communication device based on the reference signal sent by the second communication device. The second communication device sends the reference signal on the P antenna ports associated with the P reference signal ports, the P reference signal ports correspond to the P data ports in the N data ports one by one, the N antenna ports correspond to the N data ports one by one, and P is a positive integer less than N. It can be understood that for channel measurement and data transmission of the N antenna ports, this technical solution only sends reference signals of the P antenna ports instead of reference signals of the N antenna ports, and the first communication device can utilize the spatial antenna inter-channel correlation to obtain the channel information corresponding to the remaining antenna ports which do not send reference signals or are not measured, and the association between the N data ports and the N antenna ports is guaranteed. Therefore, the resource overhead of sending reference signals is effectively reduced, which helps to improve the system capacity.

[0252] It should be understood that the size of the serial number of the above processes does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0253] It should also be understood that in various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to if there is no special description and no logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0254] It should also be understood that in some of the above embodiments, the existing network architecture is mainly taken as an example for exemplary description, and it should be understood that the specific form of the device is not limited in the embodiments of the present application. For example, devices that can achieve the same function in the future are also applicable to the embodiments of the present application.

[0255] It can be understood that in each of the above method embodiments, the methods and operations implemented by the device (such as the first communication device and the second communication device) can also be implemented by components (such as chips or circuits) that can be used for the device.

[0256] It can also be understood that some optional features of the embodiments of the present application can not depend on other features in some scenarios, or can be combined with other features in some scenarios, without limitation.

[0257] The above describes the communication method provided by the embodiments of the present application in detail in combination with FIG. 3. The above communication method is mainly introduced from the perspective of the interaction between the first communication device and the second communication device. It can be understood that the first communication device and the second communication device contain the hardware structure and / or software module corresponding to the execution of each function in order to realize the above functions.

[0258] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0259] The following describes the communication device provided by the embodiments of the present application in detail in combination with FIG. 7 to FIG. 9. It should be understood that the description of the device embodiments corresponds to the description of the method embodiments, therefore, the content not described in detail can be referred to the above method embodiments, and part of the content will not be described again for brevity.

[0260] The embodiments of the present application can divide the function modules of the first communication device and the second communication device according to the above method examples, for example, each function module can be divided corresponding to each function, or two or more functions can be integrated in one processing module. The above integrated module can be realized in the form of hardware or software function module. It should be noted that the division of the modules in the embodiments of the present application is illustrative, and is only a logical function division, and another division mode can be used in actual implementation. The following takes dividing each function module corresponding to each function as an example for description.

[0261] FIG. 7 is a schematic block diagram of the communication device 10 provided by the embodiments of the present application. The device 10 includes a transceiver module 11 and a processing module 12. The transceiver module 11 can realize corresponding communication functions, and the processing module 12 is used for data processing, or the transceiver module 11 is used for executing the operations related to receiving and sending, and the processing module 12 is used for executing other operations except receiving and sending. The transceiver module 11 can also be called a communication interface or a communication unit.

[0262] Optionally, the apparatus 10 further includes a storage module 13, which can be configured to store instructions and / or data. The processing module 12 can read the instructions and / or data stored in the storage module, so as to enable the apparatus to implement the actions of the device in the foregoing method embodiments.

[0263] In one design, the apparatus 10 can correspond to, or be a component (e.g., a chip) of, the first communication device in the method embodiments above.

[0264] The apparatus 10 can implement the steps or procedures performed by the first communication device in the method embodiments above. The transceiver module 11 can be configured to perform the transceiving-related operations of the first communication device in the method embodiments above. The processing module 12 can be configured to perform the processing-related operations of the first communication device in the method embodiments above.

[0265] In one possible implementation, the transceiver module 11 is configured to receive a reference signal from a second communication device, the reference signal corresponding to P reference signal ports. The processing module 12 is configured to determine, according to the reference signal, channel information corresponding to N antenna ports of the second communication device, the N antenna ports one-to-one corresponding to N data ports, the N data ports being used to transmit data, the data being data sent by the second communication device to the first communication device, wherein the P reference signal ports are associated with P antenna ports of the N antenna ports, N being a positive integer, and P being a positive integer smaller than N.

[0266] When the apparatus 10 is configured to perform the method in FIG. 3, the transceiver module 11 can be configured to perform the steps of receiving information in the method, such as steps S310, S311, S312, S313, S313, S314, and S315. The processing module 12 can be configured to perform the processing steps in the method, such as step S320.

[0267] It should be understood that the specific process by which each unit performs the corresponding steps described above has been described in detail in the method embodiments above, and thus will not be described again here for brevity.

[0268] In another design, the apparatus 10 can correspond to, or be a component (e.g., a chip) of, the second communication device in the method embodiments above.

[0269] The apparatus 10 can implement the steps or procedures performed by the second communication device in the method embodiments above. The transceiver module 11 can be configured to perform the transceiving-related operations of the second communication device in the method embodiments above. The processing module 12 can be configured to perform the processing-related operations of the second communication device in the method embodiments above.

[0270] In a possible implementation, the processing module 12 is configured to generate reference signals corresponding to P antenna ports. The transceiver module 11 is configured to transmit the reference signals to the first communication device, wherein the P reference signal ports are associated with P antenna ports of N antenna ports of the second communication device, N is a positive integer, P is a positive integer less than N, the N antenna ports are in one-to-one correspondence with N data ports, and the N data ports are used to transmit data, and the data is data transmitted by the second communication device to the first communication device.

[0271] When the apparatus 10 is configured to perform the method in FIG. 3, the transceiver module 11 can be configured to perform the steps of transmitting and receiving information in the method, such as steps S310, S311, S312, S313, S313, S314 and S315; and the processing module 12 can be configured to perform the processing steps in the method.

[0272] It should be understood that the specific processes in which each unit performs the corresponding steps are described in detail in the above method embodiments, and thus will not be described here again for the sake of brevity.

[0273] It should also be understood that the apparatus 10 herein is embodied in the form of functional modules. The term "module" herein can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, and / or other suitable components that provide the described functionality. In an optional example, those skilled in the art can understand that the apparatus 10 can be embodied as a mobility management network element in the above embodiments, and can be configured to perform the processes and / or steps corresponding to the mobility management network element in the above method embodiments; or the apparatus 10 can be embodied as a terminal device in the above embodiments, and can be configured to perform the processes and / or steps corresponding to the terminal device in the above method embodiments, and thus will not be described here again for the sake of brevity.

[0274] The apparatus 10 of each of the above schemes has the function of performing the corresponding steps performed by the device (such as the first communication device and the second communication device) in the above method. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions; for example, the transceiver module can be replaced by a transceiver (for example, the sending unit in the transceiver module can be replaced by a transmitter, and the receiving unit in the transceiver module can be replaced by a receiver), and other units, such as the processing module, can be replaced by a processor, which performs the transmitting and receiving operations and related processing operations in each of the method embodiments.

[0275] In addition, the transceiver module 11 can also be a transceiver circuit (for example, can include a receiving circuit and a sending circuit), and the processing module can be a processing circuit.

[0276] Fig. 8 is a schematic diagram of another communication apparatus 20 provided by the embodiments of the present application. The apparatus 20 includes a processor 21 configured to execute computer programs or instructions stored in a memory 22, or read data / signaling stored in the memory 22, to perform the methods in the above method embodiments. Optionally, the processor 21 is one or more.

[0277] Optionally, as shown in Fig. 8, the apparatus 20 further includes the memory 22 configured to store computer programs or instructions and / or data. The memory 22 can be integrated with the processor 21, or can be separately arranged. Optionally, the memory 22 is one or more.

[0278] Optionally, as shown in Fig. 8, the apparatus 20 further includes a transceiver 23 configured to receive and / or send signals. For example, the processor 21 is configured to control the transceiver 23 to receive and / or send signals.

[0279] As an option, the apparatus 20 is configured to implement the operations performed by the first communication device or the second communication device in the above method embodiments.

[0280] It should be understood that the processor mentioned in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or the processor can also be any conventional processor.

[0281] It should also be understood that the memory mentioned in the embodiments of the present application can be a volatile memory and / or a non-volatile memory. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM). For example, the RAM can be used as an external cache. As an example but not limitation, the RAM includes the following various forms: static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM) and direct rambus RAM (DR RAM).

[0282] It should be noted that when the processor is a general processor, a DSP, an ASIC, a FPGA or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, the memory (storage module) can be integrated in the processor.

[0283] It should also be noted that the memory described herein is intended to include, but not limited to, these and any other suitable type of memory.

[0284] FIG. 9 is a schematic diagram of a chip system 30 provided by an embodiment of the present application. The chip system 30 (or also can be referred to as a processing system) includes a logic circuit 31 and an input / output interface 32.

[0285] Among them, the logic circuit 31 can be a processing circuit in the chip system 30. The logic circuit 31 can be coupled to a storage unit, call instructions in the storage unit, so that the chip system 30 can realize the method and function of each embodiment of the present application. The input / output interface 32 can be an input / output circuit in the chip system 30, output the information processed by the chip system 30, or input the data or signaling information to be processed into the chip system 30 for processing.

[0286] As a solution, the chip system 30 is configured to implement operations performed by the terminal device or the network device in the above method embodiments.

[0287] For example, the logic circuit 31 is configured to implement processing-related operations performed by the terminal device in the above method embodiments; and the input / output interface 32 is configured to implement sending and / or receiving-related operations performed by the terminal device in the above method embodiments.

[0288] The embodiments of the present application further provide a computer readable storage medium, having stored thereon computer instructions for implementing the method performed by the device in the above method embodiments.

[0289] For example, the computer program, when executed by a computer, enables the computer to implement the method performed by the first communication device or the second communication device in the above method embodiments.

[0290] The embodiments of the present application further provide a computer program product, containing instructions, which, when executed by a computer, implement the method performed by the first communication device or the second communication device in the above method embodiments.

[0291] The embodiments of the present application further provide a communication system, comprising the first communication device and the second communication device as described above.

[0292] The above-described explanations and advantages of the related contents in any of the apparatuses provided above can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0293] In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. For example, the division of the apparatus embodiments is only a logical function division, and other division manners can be adopted during actual implementation; for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0294] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable apparatus. For example, the computer can be a personal computer, a server, a network device, etc. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media sets. The available media can be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD), etc. For example, the foregoing available media includes but is not limited to: a variety of media that can store program codes such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0295] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method, characterized in that, Applied to a first communication device, including: Receive a reference signal, which corresponds to P reference signal ports; Based on the reference signal, the channel information corresponding to the N antenna ports of the second communication device is determined. Each of the N antenna ports corresponds one-to-one with one of the N data ports, which are used to transmit data. This data is the data sent by the second communication device to the first communication device. Wherein, the P reference signal ports are associated with P antenna ports out of the N antenna ports, where N is a positive integer and P is a positive integer less than N.

2. The method according to claim 1, characterized in that, The method further includes: Send first indication information, which is used to indicate P reference signal ports out of N reference signal ports corresponding to the first reference signal resource. Wherein, the first reference signal resource is one of at least one reference signal resource configured by the first communication device for the second communication device, each of the at least one reference signal resources corresponds to N reference signal ports, the N reference signal ports correspond one-to-one with the N antenna ports, and the N reference signal ports correspond one-to-one with the N data ports.

3. The method according to claim 2, characterized in that, The first indication information is used to indicate the P reference signal ports among the N reference signal ports corresponding to the first reference signal resource, including: The first indication information indicates P reference signal ports among the N reference signal ports corresponding to the first reference signal resource, used for transmitting the reference signal; or, The first indication information indicates that among the N reference signal ports corresponding to the first reference signal resource, Q reference signal ports are not used to transmit the reference signal, and the Q reference signal ports are the reference signal ports other than the P reference signal ports among the N reference signal ports.

4. The method according to claim 1, characterized in that, The method further includes: Send first configuration information, which is used to configure at least one reference signal resource group. Each reference signal resource group includes multiple reference signal resources. The first reference signal resource in the multiple reference signal resources corresponds to the P reference signal ports. The second reference signal resource in the multiple reference signal resources corresponds to N reference signal ports. The N reference signal ports correspond one-to-one with the N antenna ports and one-to-one with the N data ports.

5. The method according to claim 4, characterized in that, The method further includes: Send a second indication message, which indicates that each of the P reference signal ports corresponding to the first reference signal resource is associated with one of the N reference signal ports corresponding to the second reference signal resource.

6. The method according to any one of claims 1 to 5, characterized in that, The method further includes: Send a third indication message, which is used to indicate the first cycle and the second cycle. Wherein, the first period is the transmission period of the reference signal resources corresponding to N reference signal ports, and the second period is the transmission period of the reference signal resources corresponding to P reference signal ports.

7. The method according to claim 1, characterized in that, The method further includes: Send second configuration information, which is used to configure at least one reference signal resource, and each reference signal resource corresponds to the P reference signal ports.

8. The method according to claim 7, characterized in that, The method further includes: Send a fourth indication message, which indicates that each of the P reference signal ports corresponding to each reference signal resource is associated with one of the N data ports.

9. The method according to any one of claims 1 to 8, characterized in that, The method further includes: Send at least one of the following messages: The function of the reference signal resource is to indicate information based on codebook transmission, information of time-frequency resources mapped to the reference signal resource, information of the transmission period of the reference signal resource, or information of the sequence corresponding to the reference signal.

10. The method according to any one of claims 1 to 9, characterized in that, When the P reference signal ports are mapped within a time domain unit, the transmission power corresponding to each of the P reference signal ports is the ratio of the transmission power of the second communication device to P, and the transmission power corresponding to each of the N data ports is the ratio of the transmission power of the second communication device to N.

11. A communication method, characterized in that, Applied to a second communication device, including: Generate reference signals for P antenna ports; Send the reference signal, The P reference signal ports are associated with P antenna ports out of the N antenna ports of the second communication device, where N is a positive integer and P is a positive integer less than N. The N antenna ports correspond one-to-one with the N data ports, and the N data ports are used to transmit data, which is the data sent by the second communication device to the first communication device.

12. The method according to claim 11, characterized in that, The method further includes: Receive first indication information, the first indication information being used to indicate P reference signal ports out of N reference signal ports corresponding to the first reference signal resource. Wherein, the first reference signal resource is one of at least one reference signal resource configured by the first communication device for the second communication device, each of the at least one reference signal resource corresponds to N reference signal ports, the N reference signal ports correspond one-to-one with the N antenna ports, and the N reference signal ports correspond one-to-one with the N data ports.

13. The method according to claim 12, characterized in that, The first indication information is used to indicate the P reference signal ports among the N reference signal ports corresponding to the first reference signal resource, including: The first indication information indicates P reference signal ports among the N reference signal ports corresponding to the first reference signal resource, used for transmitting the reference signal; or, The first indication information indicates that among the N reference signal ports corresponding to the first reference signal resource, Q reference signal ports are not used to transmit the reference signal, and the Q reference signal ports are the reference signal ports other than the P reference signal ports among the N reference signal ports.

14. The method according to claim 11, characterized in that, The method further includes: Receive first configuration information, which is used to configure at least one reference signal resource group. Each reference signal resource group includes multiple reference signal resources. The first reference signal resource among the multiple reference signal resources corresponds to the P reference signal ports. The second reference signal resource among the multiple reference signal resources corresponds to N reference signal ports. The N reference signal ports correspond one-to-one with the N antenna ports and one-to-one with the N data ports.

15. The method according to claim 14, characterized in that, The method further includes: Receive second indication information, the second indication information being used to indicate that each of the P reference signal ports corresponding to the first reference signal resource is associated with one of the N reference signal ports corresponding to the second reference signal resource.

16. The method according to any one of claims 11 to 15, characterized in that, The method further includes: Receive third indication information, which is used to indicate the first cycle and the second cycle. Wherein, the first period is the transmission period of the reference signal resources corresponding to N reference signal ports, and the second period is the transmission period of the reference signal resources corresponding to P reference signal ports.

17. The method according to claim 11, characterized in that, The method further includes: Receive second configuration information, which is used to configure at least one reference signal resource, and each reference signal resource corresponds to the P reference signal ports.

18. The method according to claim 17, characterized in that, The method further includes: Receive fourth indication information, which is used to indicate that each of the P reference signal ports corresponding to each reference signal resource is associated with one of the N data ports.

19. The method according to any one of claims 11 to 18, characterized in that, The method further includes: Receive at least one of the following information: The function of the reference signal resource is to indicate information based on codebook transmission, information of time-frequency resources mapped to the reference signal resource, information of the transmission period of the reference signal resource, or information of the sequence corresponding to the reference signal.

20. The method according to any one of claims 11 to 19, characterized in that, When the P reference signal ports are mapped within a time domain unit, the transmission power corresponding to each of the P reference signal ports is the ratio of the transmission power of the second communication device to P, and the transmission power corresponding to each of the N data ports is the ratio of the transmission power of the second communication device to N.

21. A communication device, characterized in that, The terminal device includes a processor and a memory, the processor and the memory being coupled together, the memory being used to store a computer program, which, when the processor runs the computer program, causes the communication device to perform the method as described in any one of claims 1-10; or causes the communication device to perform the method as described in any one of claims 11-20.

22. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed on a communication device, cause the communication device to perform the method as described in any one of claims 1-20.

23. A computer program product, characterized in that, The computer instructions, when executed on the communication device, cause the communication device to perform the method as described in any one of claims 1-20.

24. A chip, characterized in that, The chip includes a processor and a communication interface. The processor reads and executes instructions through the communication interface. When the chip is installed in a communication device, the communication device performs the method as described in any one of claims 1-20.

25. A communication system, characterized in that, The communication system includes a terminal device and a network device, wherein the network device is used to perform the method as described in any one of claims 1-10, and the terminal device is used to perform the method as described in any one of claims 11-20.

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