Communication method and communication apparatus

Abstract

Provided in the present application is a communication method, the method being executed by a terminal device, and the method comprising: acquiring a first correspondence relationship, the first correspondence relationship indicating a correspondence relationship between N CDM groups and L sub-paths, where L≥N, and both L and N are positive integers; receiving first indication information, the first indication information being used for indicating a first CDM group, the first CDM group being one of the N CDM groups, and the first CDM group being a non-data-transmitting CDM group; and, on the basis of the first CDM group and the first correspondence relationship, performing no data transmission on a time-frequency resource to which a first sub-path is mapped, the first sub-path being a sub-path corresponding to the first CDM group. The described technical solution can reduce overheads of indication signaling, and further achieve throughput gains of MIMO systems.

Description

A communication method and a communication apparatus

[0001] The present application claims priority to the Chinese patent application No. 202411071386.5, filed on August 5, 2024, and entitled "A communication method and a 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 wireless communication, in particular, to a communication method and a communication apparatus. BACKGROUND

[0003] In a multi user-multiple input multiple output (MU-MIMO) scenario, a base station communicates with multiple terminals simultaneously. Before terminal #1 demodulates data based on a received demodulation reference signal (DMRS), terminal #1 needs to perform rate matching. Specifically, terminal #1 needs to know not only its own DMRS port, but also the DMRS ports of other terminals that are co-scheduled, based on the DMRS ports of terminal #1 and the co-scheduled terminals and resource mapping information corresponding to the DMRS ports, to determine which resource elements (REs) are occupied in a current transmission time slot, i.e., which REs will not transmit data of terminal #1. If terminal #1 cannot obtain this information, the data of terminal #1 will conflict with the DMRS of other terminals in time-frequency resources, affecting the DMRS estimation accuracy of other terminals and the decoding performance of terminal #1.

[0004] To implement DMRS rate matching of multiple terminals, a standard provides an explicit signaling indication method. The base station can indicate to terminal #1 CDM group information corresponding to the DMRS ports of terminal #1 and other co-scheduled terminals in a current transmission time slot, which can be used to determine which REs are occupied by the DMRS ports of terminal #1 and other co-scheduled terminals in the current transmission time slot. However, in this indication method, the indication signaling is issued together with the DMRS port indication information, and its overhead will increase sharply with the increase of the number of ports or the number of port combinations.

[0005] Therefore, how to reduce the indication signaling overhead of DMRS rate matching has become a problem to be solved. SUMMARY

[0006] The present application provides a communication method, which can reduce the indication signaling overhead of DMRS rate matching.

[0007] In a first aspect, a method of communication is provided, which can be performed by a terminal device, or also can be performed by a component (for example, a chip or a circuit) of the terminal device, without limitation, and for the convenience of description, the following is described by way of example of being performed by a terminal device.

[0008] The method can include: obtaining a first correspondence relationship, the first correspondence relationship indicating a correspondence relationship between N code division multiplexing (CDM) groups and L sub-radiates, L≥N, and L and N are positive integers; receiving first indication information, the first indication information being used to indicate a first CDM group, the first CDM group belonging to the N CDM groups, and the first CDM group being a CDM group in which no data is transmitted; and based on the first CDM group and the first correspondence relationship, not performing data transmission on a time-frequency resource mapped by a first sub-radiate or a time-frequency resource mapped by an antenna port corresponding to the first sub-radiate, the first sub-radiate being a sub-radiate corresponding to the first CDM group.

[0009] In the present application, time-frequency resources corresponding to each of the N CDM groups do not overlap.

[0010] It can be understood that the first CDM group is one or more of the N CDM groups.

[0011] It should be understood that the first CDM group can also be understood as a CDM group occupied by a DMRS.

[0012] It can be understood that the terminal device does not perform data reception or transmission on the time-frequency resource mapped by the first sub-radiate.

[0013] In the technical solution of the present application, the terminal device obtains the first correspondence relationship, then the terminal device receives the indication information indicating the first CDM group, and based on the first CDM group and the first correspondence relationship, determines a sub-radiate corresponding to the first CDM group, and does not perform data transmission on the time-frequency resource mapped by the sub-radiate or the antenna port corresponding to the sub-radiate. Based on the technical solution, a data transmission DMRS rate matching indication method suitable for a future communication network (for example, a sixth generation (6G) communication network) can be provided, which can save the overhead of indication signaling, and further achieve the throughput gain of a MIMO system. th

[0014] ​In some implementations of the first aspect, the first correspondence relationship indicates a correspondence relationship between the N CDM groups and the L sub-radiates, including any one of the following: the first correspondence relationship includes a one-to-one correspondence relationship between the L ports and the L sub-radiates, the L ports being ports corresponding to the N CDM groups; the first correspondence relationship includes a correspondence relationship between the N CDM groups and L ports, the L ports and the L sub-radiates being in one-to-one correspondence; the first correspondence relationship includes a correspondence relationship between the L sub-radiates and M time-frequency resources, the M time-frequency resources being time-frequency resources corresponding to the N CDM groups.

[0015] In some implementations of the first aspect, a number of time-frequency resources corresponding to each of the N CDM groups is the same, or a number of time-frequency resources corresponding to at least two of the N CDM groups is different.

[0016] In some implementations of the first aspect, the not performing data transmission on the time-frequency resource mapped by the first sub-radiate includes not performing data transmission on all time-frequency resources of a port corresponding to the first sub-radiate, or not performing data transmission on a first time-frequency resource of the port corresponding to the first sub-radiate, the first time-frequency resource being the time-frequency resource mapped by the first sub-radiate.

[0017] In some implementations of the first aspect, a value of the first indication information is related to an identifier of the first CDM group and / or a number of the first CDM group.

[0018] In some implementations of the first aspect, the first indication information is identifier information of the first CDM group.

[0019] In some implementations of the first aspect, the obtaining the first correspondence relationship includes receiving second indication information, the second indication information being used to indicate the first correspondence relationship.

[0020] In some implementations of the first aspect, the second indication information is identifier information of the first correspondence relationship.

[0021] In some implementations of the first aspect, the L sub-radiates are determined based on a correlation threshold and / or a power threshold.

[0022] In a second aspect, a communication method is provided, which can be executed by a terminal device or a component (such as a chip or a circuit) of the terminal device, and is not limited to this. For ease of description, the following describes the method as being executed by the terminal device.

[0023] The method can comprise: receiving third indication information, the third indication information being used to indicate X sub-radii, the X sub-radii corresponding to X ports in a one-to-one manner; and performing no data transmission on time-frequency resources corresponding to the X ports according to the third indication information, wherein X is a positive integer.

[0024] In the technical solution of the present application, the terminal device receives third indication information and performs no data transmission on time-frequency resources of X ports corresponding to X sub-radii indicated by the third indication information. Based on the above technical solution, a data transmission DMRS rate matching indication method suitable for future communication networks (such as 6G networks) can be provided, which can save the overhead of indication signaling and further realize the throughput gain of MIMO systems.

[0025] In combination with the second aspect, in some implementations of the second aspect, the X sub-radii are determined based on sensing information.

[0026] In combination with the second aspect, in some implementations of the second aspect, the third indication information is carried in high-layer signaling.

[0027] In combination with the second aspect, in some implementations of the second aspect, the third indication information is semi-statically configured or periodically configured. Based on the above technical solution, a semi-static or long-period RM configuration mode can be realized, further reducing the DMRS RM configuration overhead.

[0028] Thirdly, a communication method is provided, which can be executed by a network device or a component (such as a chip or a circuit) of the network device, and is not limited. For ease of description, the method executed by the network device is described below.

[0029] The method can comprise: determining a first correspondence relationship, the first correspondence relationship indicating a correspondence relationship between N CDM groups and L sub-radii, L≥N, and L and N are both positive integers; and sending first indication information, the first indication information being used to indicate a first CDM group, the first CDM group belonging to the N CDM groups, the first CDM group being a CDM group in which no data is transmitted, wherein the first CDM group and the first correspondence relationship are used to determine a first sub-radii, time-frequency resources mapped by the first sub-radii perform no data transmission, or time-frequency resources mapped by an antenna port corresponding to the first sub-radii perform no data transmission, and the first sub-radii is a sub-radii corresponding to the first CDM group.

[0030] In some implementations of the third aspect, in combination with the third aspect, the first correspondence relationship indicates a correspondence relationship between the N CDM groups and the L sub-radii, including any one of the following: the first correspondence relationship includes a one-to-one correspondence relationship between the L ports and the L sub-radii, the L ports being ports corresponding to the N CDM groups; the first correspondence relationship includes a correspondence relationship between the N CDM groups and L ports, the L ports and the L sub-radii being in a one-to-one correspondence; the first correspondence relationship includes a correspondence relationship between the L sub-radii and M time-frequency resources, the M time-frequency resources being time-frequency resources corresponding to the N CDM groups.

[0031] In some implementations of the third aspect, in combination with the third aspect, a number of time-frequency resources corresponding to each of the N CDM groups is the same; or a number of time-frequency resources corresponding to at least two of the N CDM groups is different.

[0032] In some implementations of the third aspect, in combination with the third aspect, the time-frequency resource of the first sub-radium does not perform data transmission, including: all time-frequency resources of the port corresponding to the first sub-radium do not perform data transmission; or a first time-frequency resource of the port corresponding to the first sub-radium does not perform data transmission, the first time-frequency resource being a time-frequency resource mapped by the first sub-radium.

[0033] In some implementations of the third aspect, in combination with the third aspect, a value of the first indication information is related to an identifier of the first CDM group and / or a number of the first CDM group.

[0034] In some implementations of the third aspect, in combination with the third aspect, the first indication information is identifier information of the first CDM group.

[0035] In some implementations of the third aspect, in combination with the third aspect, the method further includes: sending second indication information, the second indication information being used to indicate the first correspondence relationship.

[0036] In some implementations of the third aspect, in combination with the third aspect, the second indication information is identifier information of the first correspondence relationship.

[0037] In some implementations of the third aspect, in combination with the third aspect, the L sub-radii are determined based on a correlation threshold and / or a power threshold.

[0038] A fourth aspect provides a communication method, which can be executed by a network device, or can also be executed by a component (such as a chip or a circuit) of the network device, and the execution is not limited. For ease of description, the following describes the execution by the network device.

[0039] The method can include: sending third indication information, the third indication information being used to indicate X sub-radii, the X sub-radii corresponding to X ports one by one, time-frequency resources corresponding to the X ports not being used for data transmission; wherein X is a positive integer.

[0040] With reference to the fourth aspect, in some implementations of the fourth aspect, the X sub-radii are determined based on sensing information.

[0041] With reference to the fourth aspect, in some implementations of the fourth aspect, the third indication information is carried in high-layer signaling.

[0042] With reference to the fourth aspect, in some implementations of the fourth aspect, the third indication information is semi-statically configured or periodically configured.

[0043] The fifth aspect provides a communication apparatus, including: a processing unit configured to obtain a first correspondence relationship, the first correspondence relationship indicating a correspondence relationship between N CDM groups and L sub-radii, L≥N, and L and N are both positive integers; a transceiver configured to receive first indication information, the first indication information being used to indicate a first CDM group, the first CDM group belonging to the N CDM groups, and the first CDM group being a CDM group not used for data transmission; and the processing unit is configured to not perform data transmission on time-frequency resources mapped by a first sub-radii or on time-frequency resources mapped by an antenna port corresponding to the first sub-radii based on the first CDM group and the first correspondence relationship, the first sub-radii being a sub-radii corresponding to the first CDM group.

[0044] With reference to the fifth aspect, in some implementations of the fifth aspect, the first correspondence relationship indicating a correspondence relationship between N CDM groups and L sub-radii includes any of the following: the first correspondence relationship includes a one-to-one correspondence relationship between L ports and the L sub-radii, the L ports being ports corresponding to the N CDM groups; the first correspondence relationship includes a correspondence relationship between the N CDM groups and L ports, the L ports and the L sub-radii being one-to-one corresponding; and the first correspondence relationship includes a correspondence relationship between the L sub-radii and M time-frequency resources, the M time-frequency resources being time-frequency resources corresponding to the N CDM groups.

[0045] With reference to the fifth aspect, in some implementations of the fifth aspect, a number of time-frequency resources corresponding to each of the N CDM groups is the same; or a number of time-frequency resources corresponding to at least two of the N CDM groups is different.

[0046] In some implementations of the fifth aspect, in the method, the not performing data transmission on the time-frequency resource mapped by the first sub-radiation includes: not performing data transmission on all time-frequency resources of a port corresponding to the first sub-radiation; or not performing data transmission on a first time-frequency resource of the port corresponding to the first sub-radiation, the first time-frequency resource being the time-frequency resource mapped by the first sub-radiation.

[0047] In some implementations of the fifth aspect, in the method, the first indication information is related to an identifier of the first CDM group and / or a quantity of the first CDM group.

[0048] In some implementations of the fifth aspect, in the method, the first indication information is identifier information of the first CDM group.

[0049] In some implementations of the fifth aspect, in the method, the processing unit is specifically configured to: receive second indication information, the second indication information being used to indicate the first correspondence.

[0050] In some implementations of the fifth aspect, in the method, the second indication information is identifier information of the first correspondence.

[0051] In some implementations of the fifth aspect, in the method, the L sub-radiations are determined based on a correlation threshold and / or a power threshold.

[0052] In a sixth aspect, a communication apparatus is provided, including: a transceiver configured to receive third indication information, the third indication information being used to indicate X sub-radiations, the X sub-radiations corresponding to X ports in a one-to-one manner; and a processing unit configured to not perform data transmission on time-frequency resources corresponding to the X ports according to the third indication information, where X is a positive integer.

[0053] In some implementations of the sixth aspect, in the apparatus, the X sub-radiations are determined based on sensing information.

[0054] In some implementations of the sixth aspect, in the apparatus, the third indication information is carried in high-layer signaling.

[0055] In some implementations of the sixth aspect, in the apparatus, the third indication information is semi-statically configured or periodically configured.

[0056] In a seventh aspect, a communication apparatus is provided, comprising: a processing unit configured to determine a first correspondence relationship, the first correspondence relationship indicating a correspondence relationship between N CDM groups and L sub-ranges, L≥N, and L and N are positive integers; and a transceiver configured to send first indication information, the first indication information being used to indicate a first CDM group, the first CDM group belonging to the N CDM groups, and the first CDM group being a CDM group in which no data is transmitted, wherein the first CDM group and the first correspondence relationship are used to determine a first sub-range, time-frequency resources mapped by the first sub-range are not used for data transmission, and the first sub-range is a sub-range corresponding to the first CDM group.

[0057] With reference to the seventh aspect, in some implementations of the seventh aspect, the first correspondence relationship indicating the correspondence relationship between the N CDM groups and the L sub-ranges includes any of the following: the first correspondence relationship includes a one-to-one correspondence relationship between L ports and the L sub-ranges, the L ports being ports corresponding to the N CDM groups; the first correspondence relationship includes a correspondence relationship between the N CDM groups and L ports, the L ports and the L sub-ranges being in a one-to-one correspondence; or the first correspondence relationship includes a correspondence relationship between the L sub-ranges and M time-frequency resources, the M time-frequency resources being time-frequency resources corresponding to the N CDM groups.

[0058] With reference to the seventh aspect, in some implementations of the seventh aspect, a number of time-frequency resources corresponding to each of the N CDM groups is the same; or a number of time-frequency resources corresponding to at least two of the N CDM groups is different.

[0059] With reference to the seventh aspect, in some implementations of the seventh aspect, the time-frequency resources of the first sub-range not being used for data transmission includes: all time-frequency resources of a port corresponding to the first sub-range not being used for data transmission; or first time-frequency resources of the port corresponding to the first sub-range not being used for data transmission, the first time-frequency resources being time-frequency resources mapped by the first sub-range.

[0060] With reference to the seventh aspect, in some implementations of the seventh aspect, a value of the first indication information is related to an identifier of the first CDM group and / or a number of the first CDM group.

[0061] With reference to the seventh aspect, in some implementations of the seventh aspect, the first indication information is identifier information of the first CDM group.

[0062] With reference to the seventh aspect, in some implementations of the seventh aspect, the transceiver is further configured to send second indication information, the second indication information being used to indicate the first correspondence relationship.

[0063] With reference to the seventh aspect, in some implementations of the seventh aspect, the second indication information is identifier information of the first correspondence relationship.

[0064] With reference to the seventh aspect, in some implementations of the seventh aspect, the L sub-ranks are determined based on a correlation threshold and / or a power threshold.

[0065] An eighth aspect provides a communication apparatus, comprising: a transceiver configured to transmit third indication information, the third indication information being used to indicate X sub-ranks, the X sub-ranks corresponding to X ports, and time-frequency resources corresponding to the X ports not being used for data transmission; wherein X is a positive integer.

[0066] With reference to the eighth aspect, in some implementations of the eighth aspect, the X sub-ranks are determined based on sensing information.

[0067] With reference to the eighth aspect, in some implementations of the eighth aspect, the third indication information is carried in high-layer signaling.

[0068] With reference to the eighth aspect, in some implementations of the eighth aspect, the third indication information is semi-statically configured or periodically configured.

[0069] A ninth aspect provides a communication apparatus, which is configured to perform the method provided in the first aspect or the second aspect. Specifically, the apparatus can include units and / or modules for performing the method in the first aspect or any possible implementation of the first aspect, and the method in the second aspect or any possible implementation of the second aspect, such as a processing unit and / or a communication unit.

[0070] In an implementation, the apparatus is a terminal device. When the apparatus is a terminal device, the communication unit can be a transceiver, or an input / output interface; and 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.

[0071] In another implementation, the apparatus is a chip, a chip system or a circuit used in a terminal device. When the apparatus is a chip, a chip system or a circuit used in a terminal device, the communication 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, etc.; and the processing unit can be at least one processor, a processing circuit or a logic circuit, etc.

[0072] A tenth aspect provides a communication apparatus, which is configured to perform the method provided in the third aspect or the fourth aspect. Specifically, the apparatus can include units and / or modules for performing the method in the third aspect or any possible implementation of the third aspect, and the method in the fourth aspect or any possible implementation of the fourth aspect, such as a processing unit and / or a communication unit.

[0073] In one implementation, the device is a network device. When the device is a network device, the communication 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.

[0074] In another implementation, the device is a chip, chip system, or circuit used in a network device. When the device is a chip, chip system, or circuit used in a network device, the communication unit may be an input / output interface, interface circuit, output circuit, input circuit, pin, or related circuit on the chip, chip system, or circuit; the processing unit may be at least one processor, processing circuit, or logic circuit.

[0075] Eleventh aspect, a communication device is provided, the device comprising: at least one processor coupled to at least one memory, the at least one memory for storing computer programs or instructions, and the at least one processor for calling and running the computer programs or instructions from the at least one memory, such that the communication device performs the methods of the first aspect or any possible implementation thereof and the second aspect or any possible implementation thereof.

[0076] In one implementation, the device is a terminal device.

[0077] In another implementation, the device is a chip, chip system, or circuit used in a receiving device.

[0078] In a twelfth aspect, a communication device is provided, the device comprising: at least one processor coupled to at least one memory, the at least one memory for storing computer programs or instructions, and the at least one processor for calling and running the computer programs or instructions from the at least one memory, such that the communication device performs the methods of the third aspect or any possible implementation thereof and the fourth aspect or any possible implementation thereof.

[0079] In one implementation, the device is a network device.

[0080] In another implementation, the device is a chip, chip system, or circuit used in network equipment.

[0081] In a thirteenth aspect, a processor is provided for performing the methods provided in the foregoing aspects.

[0082] For the sending and obtaining / receiving operations involved by the processor, if no special description is given, or if it does not contradict with the actual role or internal logic in the related description, it can be understood as the processor output and receiving, input operations, and also can be understood as the sending and receiving operations performed by the radio frequency circuit and the antenna, and the present application does not limit this.

[0083] In a fourteenth aspect, a computer readable storage medium storing program code for execution by an apparatus is provided. The program code includes code for performing the method of any of the first aspect or the second aspect or the third aspect or the fourth aspect and any possible implementation of the first aspect or the second aspect or the third aspect or the fourth aspect.

[0084] In a fifteenth aspect, a computer program product containing instructions that, when executed on a computer, cause the computer to perform the method of any of the first aspect or the second aspect or the third aspect or the fourth aspect and any possible implementation of the first aspect or the second aspect or the third aspect or the fourth aspect.

[0085] In a sixteenth aspect, a chip is provided. The chip includes a processor and a communication interface. The processor reads instructions stored on a memory through the communication interface and performs the method of any of the first aspect or the second aspect or the third aspect or the fourth aspect and any possible implementation of the first aspect or the second aspect or the third aspect or the fourth aspect.

[0086] Optionally, as an implementation form, 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 perform the method of any of the first aspect or the second aspect or the third aspect or the fourth aspect and any possible implementation of the first aspect or the second aspect or the third aspect or the fourth aspect.

[0087] In a seventeenth aspect, a communication system is provided. The communication system includes the communication apparatus of the eleventh aspect and the twelfth aspect.

[0088] The related descriptions and beneficial effects of the third aspect to the seventeenth aspect can refer to the related descriptions and beneficial effects of the first aspect and the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0089] FIG. 1 is a schematic diagram of a wireless communication system 100 suitable for embodiments of the present application.

[0090] FIG. 2 shows two configuration types of DMRS patterns.

[0091] FIG. 3 is a schematic flowchart of a communication method 300 according to an embodiment of the present application.

[0092] FIG. 4 is a schematic diagram of time-frequency resources corresponding to different CDM groups.

[0093] FIG. 5 is another schematic diagram of time-frequency resources corresponding to different CDM groups.

[0094] FIG. 6 is a schematic flowchart of a communication method 600 according to another embodiment of the present application.

[0095] FIG. 7 is another schematic diagram of time-frequency resources corresponding to different CDM groups.

[0096] FIG. 8 is a schematic flowchart of a communication method 800 according to another embodiment of the present application.

[0097] FIG. 9 is another schematic diagram of time-frequency resources corresponding to different CDM groups.

[0098] FIG. 10 is a schematic flowchart of a communication method 1000 according to another embodiment of the present application.

[0099] FIG. 11 is a schematic block diagram of a communication apparatus 1100 according to an embodiment of the present application.

[0100] FIG. 12 is a schematic block diagram of a communication apparatus 1200 according to an embodiment of the present application. DETAILED DESCRIPTION

[0101] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0102] The technical solutions provided in the present application can be applied to various communication systems, for example: a 5th generation (5G) or new radio (NR) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, and the like. The technical solutions provided in the present application can also be applied to future communication systems, such as a 6th generation (6G) mobile communication system. The technical solutions provided in the present application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and an internet of things (IoT) communication system or other communication systems. The present application is not limited in this regard.

[0103] In the embodiments of the present application, the network device can be any device with wireless transceiving function. The device includes but is not limited to: an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (for example, a home evolved NodeB or a home Node B, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WiFi) system, a wireless relay node, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP), and the like, and can also be a gNB or a TP in a 5G, such as a NR, system, one or a group (including multiple antenna panels) of antenna panels of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (DU), or a base station in a next-generation communication 6G system, and the like.

[0104] In some deployments, a gNB can include a centralized unit (CU) and a DU. The gNB can also include an active antenna unit (AAU). The CU implements part of the functions of the gNB, and the DU implements part of the functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, implements the radio resource control (RRC), and the functions of the packet data convergence protocol (PDCP) layer. The DU is responsible for processing the physical layer protocol and real-time services, and implements the functions of the radio link control (RLC) layer, the medium access control (MAC) layer, and the physical (PHY) layer. 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 eventually becomes the information of the PHY layer, or is converted from the information of the PHY layer, under this architecture, high-layer signaling, such as RRC layer signaling, can also be considered as being sent by the DU, or being sent by the DU and the 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 radio access network (RAN), or can be divided into a network device in the core network (CN), which is not limited in the present application.

[0105] The network device provides services for a cell, and a terminal device communicates with the cell through transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the network device. The cell can belong to a macro base station (for example, a macro eNB or a macro gNB, etc.), or a base station corresponding to a small cell. The small cell can include a metro cell, a micro cell, a pico cell, a femto cell, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-speed data transmission services.

[0106] In the embodiments of the present application, the terminal device can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus.

[0107] The terminal device can be a device providing voice / data connectivity to a user, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. At present, some examples of terminals can be: a mobile phone, a pad, a computer (such as a notebook computer, a palm computer, etc.) with wireless transceiver function, a mobile internet device (MID), a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc.

[0108] Among them, the wearable device can also be called a wearable smart device, which is a general term for devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes. The wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. The wearable device is not only a hardware device, but also a powerful function realized through software support and data interaction, cloud interaction. The general wearable smart device includes functions, large size, and can realize complete or partial functions without relying on a smart phone, such as a smart watch or smart glasses, and focuses on a certain application function and needs to cooperate with other devices such as a smart phone, such as various smart wristbands and smart jewelry for monitoring vital signs.

[0109] In addition, the terminal device can also be a terminal device in an Internet of Things (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. IoT technology can achieve mass connection, deep coverage and terminal power saving through, for example, narrow band (NB) technology.

[0110] FIG. 1 is a schematic diagram of a wireless communication system 100 applicable to embodiments of the present application. As shown in FIG. 1, the wireless communication system 100 can include at least one network device, such as the network device 110 shown in FIG. 1, and at least one terminal device, such as the terminal devices 120 and 130 shown in FIG. 1. The network device and the terminal device can each be configured with multiple antennas, and the network device and the terminal device can communicate using multi-antenna technology. The terminal device and the terminal device can communicate directly with each other.

[0111] In the communication between the network device and the terminal device, the network device can manage at least one cell, and there can be at least one terminal device in a cell. Alternatively, the network device 110 and the terminal device 120 form a single-cell communication system, and without loss of generality, the cell is referred to as cell #1. The network device 110 can be a network device in cell #1, or the network device 110 can serve as a terminal device (such as the terminal device 120) in cell #1.

[0112] It should be noted that a cell can be understood as an area within the wireless signal coverage range of a network device.

[0113] It can be understood that FIG. 1 is a simplified schematic diagram for ease of understanding, and the wireless communication system 100 can further include other network devices or further include other terminal devices, which are not shown in FIG. 1. Embodiments of the present application can be applicable to any communication scenario of the communication between the network device and the terminal device. For example, it can be applicable to downlink communication, and also applicable to uplink communication. In downlink communication, the network device acts as a sending end and the terminal device acts as a receiving end, and the network device can send downlink reference signals and downlink data to the terminal device. In uplink communication, the terminal device acts as a sending end and the network device acts as a receiving end, and the terminal device can send uplink reference signals and uplink data to the network device.

[0114] The following is a brief description of the present application:

[0115] (1) In the embodiments of the present application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending information to XX" can be understood as that the destination of the information is XX, which can include direct sending through the air interface, or indirect sending through the air interface by other units or modules. "Receiving information from YY" can be understood as that the source of the information is YY, which can include direct receiving from YY through the air interface, or indirect receiving from YY through the air interface by other units or modules. "Sending" can also be understood as "output" of a chip interface, and "receiving" can also be understood as "input" of a chip interface.

[0116] In other words, sending and receiving can be between devices, such as between network devices and terminal devices, or within a device, such as between components, modules, chips, software modules or hardware modules within a device through a bus, wire or interface.

[0117] It can be understood that the information can be processed as necessary between the source and the destination of the information transmission, such as encoding and modulation, but the destination can understand the valid information from the source. Similar expressions in the present application can be similarly understood and will not be repeated here.

[0118] (2) In the embodiments of the present application, "indication" can include direct indication and indirect indication, and can also include explicit indication and implicit indication. The information indicated by a certain information (indication information as described below) is referred to as to-be-indicated information. In the 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 indicated only by a 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 be achieved by means of the arrangement order of each information agreed in advance (for example, protocol predefined), thereby reducing the indication overhead to a certain extent. The present application does not limit the specific manner of indication. It can be understood that for the sender of the indication information, the indication information can be used to indicate the to-be-indicated information, and for the receiver of the indication information, the indication information can be used to determine the to-be-indicated information.

[0119] To facilitate understanding of the embodiments of the present application, the terms involved in the embodiments of the present application are briefly introduced as follows.

[0120] 1. Multi-input multi-output (MIMO) technology

[0121] MIMO technology utilizes the resource of spatial dimension, can make the signal obtain array gain, multiplexing and diversity gain and interference cancellation gain in space without increasing the system bandwidth, and can multiply the capacity and spectrum efficiency of the communication system. For example, in the LTE system, the system can support up to 8 layers of transmission at the transmitting end and the receiving end by using multiple antennas, so as to effectively improve the system capacity.

[0122] 2, time-frequency resource

[0123] In the embodiments of the present application, data or information can be carried by a time-frequency resource. The time-frequency resource can include a resource in the time domain and a resource in the frequency domain. In the time domain, the time-frequency resource can include one or more time domain units (also referred to as time units, time units, etc.); in the frequency domain, the time-frequency resource can include one or more frequency domain units.

[0124] In the time domain, the smallest granularity is an orthogonal frequency division multiplexing (OFDM) symbol, and in the frequency domain, the smallest granularity is a subcarrier. A time-frequency resource composed of one OFDM symbol and one subcarrier is referred to as a resource element (RE), which is the smallest transmission unit for signal transmission, and the physical layer performs resource mapping in RE as the basic unit.

[0125] A time domain unit can be one symbol or several OFDM symbols, or one slot, or one mini-slot, or one subframe. A slot can include 7 or 14 symbols; a mini-slot can include at least one symbol (for example, 2 symbols or 7 symbols or 14 symbols, or any number of symbols less than or equal to 14 symbols); and the duration of a subframe in the time domain can be 1 millisecond (ms).

[0126] A frequency domain unit can be one resource block (RB), one subcarrier, one resource block group (RBG), one predefined subband, one precoding resource block group (PRG), one bandwidth part (BWP), or one carrier, or one serving cell. It should be understood that the above-mentioned time domain unit and frequency domain unit sizes are only for the convenience of understanding the scheme of the present application, and do not limit the protection scope of the present application.

[0127] 3、reference signal (RS)

[0128] The reference signal can also be called pilot, reference sequence, benchmark signal, etc. In this application, the reference signal can be a reference signal for channel measurement and channel estimation. The reference signal is distributed in the time-frequency two-dimensional space on different REs within the OFDM symbol, with known amplitude and phase. In the MIMO system, each transmitting antenna (virtual antenna or physical antenna) has an independent data channel. Based on the known RS signal, the receiver performs channel estimation for each transmitting antenna, and restores the transmitted data based on this. The current standard has defined various reference signals, such as cell-specific reference signals (CRS), demodulation reference signals (DMRS), channel state information-reference signals (CSI-RS), sounding reference signals (SRS), among which, the DMRS is used for channel estimation on the data channel (such as physical uplink share channel (PUSCH), physical downlink share channel (PDSCH)) or control channel (such as physical uplink control channel (PUCCH), physical downlink control channel (PDCCH)), thereby for the detection and demodulation of data on the corresponding channel. The CSI-RS is used for channel information measurement and realizes the reporting of channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI) and other information. The SRS is used for measuring the uplink channel, and the downlink channel can be estimated according to the uplink channel, so as to determine the precoding matrix for downlink transmission.

[0129] It should be understood that the reference signals listed above are only examples and should not constitute any limitation on the present application. The present application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

[0130] 4、antenna port

[0131] Antenna port is short for port, which can include a sending port (or called a transmitting port) and a receiving port. The sending port can be understood as a virtual antenna identified by a receiving device, or a transmitting antenna identified by a receiving end, or a spatially distinguishable transmitting antenna, which can also be called a port of a precoding reference signal. The reference signal of each sending port can be transmitted through one or more frequency domain units. One antenna port can be configured for each virtual antenna, and each virtual antenna can be a weighted combination of multiple physical antennas. The receiving port can be understood as a receiving antenna of a receiving device. For example, in downlink transmission, the receiving port can refer to the receiving antenna of a terminal device.

[0132] According to different signals carried, the antenna port can be divided into a reference signal antenna port (or called a reference signal port, a pilot port) and a data antenna port (short for a data port). The reference signal port can include but is not limited to a DMRS port, a CSI-RS port, and the like.

[0133] 5. Perception-assisted communication

[0134] As one of the potential key technologies of the next generation mobile communication system, perception fusion has become a research hotspot. The acquisition of perception signals can enhance the performance of wireless communication in some aspects, and at the same time, the performance of traditional perception services can also be improved by using a wireless communication system. For example, based on the characteristics of perception-assisted communication of the next generation communication system, MIMO systems can potentially achieve more efficient data that is independent of traditional CSI acquisition mechanisms based on the acquisition of perception parameters.

[0135] The most basic perception parameters include multipath parameters such as the angle, time delay, power, polarization, Doppler, and phase of multipath information. The above parameters can be fully utilized by MIMO algorithms to achieve performance enhancement. The potential gain can be in two aspects:

[0136] On the one hand, the resource overhead of channel acquisition and data demodulation reference signals is saved.

[0137] On the other hand, the CSI acquisition and data transmission process is simplified, and the problems of large transmission delay and complex configuration mechanism caused by the CSI acquisition process and RRC+DCI pilot configuration are alleviated.

[0138] 6. Rate matching (RM)

[0139] In order to avoid the mutual interference of the reference signal and the data from affecting the channel estimation performance and the data demodulation performance, the position of the reference signal mapping needs to be avoided by the sending end when performing data mapping, so as to ensure that the data and the reference signal are mapped on different time-frequency resources. Correspondingly, the receiving end needs to know which time-frequency resources in the time-frequency resources of the receiving end do not have data transmission, so as to avoid these time-frequency resources when demodulating the data, so as to correctly decode the data.

[0140] MIMO technology is one of the key technologies of 5G communication and future communication. When MIMO transmission data is used, the receiving end device can perform channel estimation according to the received reference signal (for example, DMRS), and then demodulate the data. Taking DMRS as an example, the number of ports and the rate matching method of the reference signal currently supported by the protocol are described below.

[0141] FIG. 2 shows two configuration types of DMRS patterns. Each square in FIG. 2 can be regarded as an RE. FIG. 2(a) is a schematic diagram of a type 1 DMRS pattern, which uses a multiplexing manner of comb + cyclic shift, and supports a maximum of 8 DMRS orthogonal ports, and the 8 DMRS orthogonal ports are 1000, 1001, 1002, 1003, 1004, 1005, 1006, and 1007, respectively. FIG. 2(b) is a schematic diagram of a type 2 DMRS pattern, which uses a manner of frequency division multiplexing + time-frequency domain code division multiplexing, and supports a maximum of 12 DMRS orthogonal ports, and the 12 DMRS orthogonal ports are 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, and 1011, respectively. As can be seen, the type 1 and type 2 DMRS patterns are configured with “double symbols” (symbols corresponding to serial numbers 2 and 3), and the DMRS ports occupy 24 REs in each RB. The main difference between the two types of DMRS patterns is the number of supported CDM groups, wherein the REs with different filling patterns represent different CDM groups. Specifically, the type 1 DMRS pattern supports 2 CDM groups, and the 8 DMRS ports belong to the 2 CDM groups (i.e., CDM group 0 and CDM group 1). Among them, CDM group 0 includes 1000, 1001, 1004, and 1005; and CDM group 1 includes 1002, 1003, 1006, and 1007. The type 2 DMRS pattern supports 3 CDM groups, and the 12 DMRS ports belong to the 3 CDM groups (CDM group 0, CDM group 1, and CDM group 2), and CDM group 0 includes 1000, 1001, 1006, and 1007; CDM group 1 includes 1002, 1003, 1008, and 1009; and CDM group 2 includes 1004, 1005, 1010, and 1011.

[0142] In actual data transmission process, the base station allocates DMRS ports to each UE and indicates the DMRS port to the UE, and the UE can determine the position of the DMRS resource allocated to itself based on the indicated port information and the DMRS pattern. The DMRS port indication can be realized through the port indication field of the downlink control information (DCI), and the field and its corresponding port allocation result are shown in Table 1. Table 1 only gives part of the port allocation result, and the complete table of Table 1 can be referred to the existing protocol. For example, the port indication field of the DCI indicates 2, and based on Table 1, the value of the 1 line of the value field is found to be 2, and it is determined that the DMRS port allocated to the UE is port 1000, 1001. It should be understood that 0, 1, 2, 3…8 in the DMRS port in Table 1 respectively represent DMRS ports 1000, 1001, 1002, 1003…1008.

[0143] Table 1

[0144] In the multi-user multiple input multiple output (MU-MIMO) scenario, the base station simultaneously communicates with multiple UEs, and the UE needs to perform rate matching when demodulating data based on the DMRS. Specifically, UE#1 needs to know the information of the DMRS port of the other UE that is commonly scheduled in addition to its own DMRS port, so as to obtain which REs are occupied by the DMRS in the current transmission time slot and no data of its own is transmitted. If UE#1 cannot obtain this information, the data of UE#1 will conflict with the DMRS of other UEs in the time-frequency resource, affecting the DMRS estimation accuracy of other UEs and the decoding performance of UE#1 itself.

[0145] In order to realize that the UE knows which DMRS time-frequency resource does not transmit data, two rate matching methods are given in the existing system.

[0146] The first is the implicit indication method adopted in LTE:

[0147] In LTE, the rate matching problem of MU-MIMO can be solved by ensuring that the DMRS of the scheduled port is multiplexed by CDM. At this time, the DMRS of all UEs is multiplexed on the same RE through CDM, thereby avoiding the rate matching problem of the DMRS. It should be noted that in this scheme, no indication information is needed to indicate the RE occupied by the DMRS.

[0148] The second is the explicit indication method adopted in 5G NR:

[0149] In 5G NR, in order to fully exert the advantages of MU-MIMO, the standard has adopted a design of supporting 12 maximum orthogonal ports for MU-MIMO (i.e. the design of the DMRS pattern corresponding to (b) of FIG. 2). In order to solve the rate matching problem of multiple users, the NR standard adopts the mode of explicit signaling indication, such as the value of num of CDM groups without data in Table 1 indicating the CDM group information occupied by all ports in the current transmission time slot of the system (because the order of the CDM group is agreed in the protocol, so knowing the number of CDM groups without data is equivalent to knowing which CDM groups, that is, knowing the serial number of the CDM group), that is, indicating the potential DMRS mapping resource, so that the user knows the potential DMRS position, and then performs data demodulation at other positions, wherein 1 represents CDM group 0, 2 represents CDM group 0 and CDM group 1, and 3 represents CDM group 0, CDM group 1 and CDM group 2.

[0150] However, the above two rate matching methods have defects: for the implicit indication method, MU-MIMO can only support a maximum of 4 orthogonal ports, which cannot meet the data transmission requirements in future communication systems. For the explicit indication method, the standard has adopted a design of supporting 12 maximum orthogonal ports for MU-MIMO. However, in the explicit indication method, the RM indication is issued together with the DMRS port indication information, and the overhead thereof increases sharply with the increase of the number of ports or the number of port combinations.

[0151] Based on this, the present application aims to provide a communication method capable of reducing the indication signaling overhead of DMRS rate matching.

[0152] The embodiments of the present application will be described in detail below with reference to the specific accompanying drawings.

[0153] FIG. 3 is a schematic flowchart of a communication method 300 provided by an embodiment of the present application, as shown in FIG. 3, the method at least includes the following steps.

[0154] S310, the terminal device obtains a first correspondence.

[0155] The first correspondence indicates the correspondence between the N CDM groups and the L sub-paths. In the present application, the time-frequency resources corresponding to each of the N CDM groups do not overlap.

[0156] It should be understood that "sub-path" can be replaced by "sub-path cluster", "path", "path", "path cluster", etc., and "correspondence" can be replaced by "mapping relationship", "association relationship", etc., which are not limited in the present application. For the sake of simplicity, the following will not be described again.

[0157] Specifically, the first correspondence relationship indicates a correspondence relationship between the N CDM groups and the L sub-radios, which can include the following cases.

[0158] Case one: the first correspondence relationship includes a one-to-one correspondence relationship between the L ports and the L sub-radios, and the L ports are ports corresponding to the N CDM groups.

[0159] Specifically, the L ports correspond to the N CDM groups, and in this case, the first correspondence relationship includes a one-to-one correspondence relationship between the L ports and the L sub-radios, which can be understood as that the first correspondence relationship indicates a correspondence relationship between the N CDM groups and the L sub-radios.

[0160] Case two: the first correspondence relationship includes a correspondence relationship between the N CDM groups and the L ports, and the L ports and the L sub-radios are in a one-to-one correspondence.

[0161] Specifically, the L ports and the L sub-radios are in a one-to-one correspondence, and in this case, the first correspondence relationship includes a correspondence relationship between the N CDM groups and the L ports, which can be understood as that the first correspondence relationship indicates a correspondence relationship between the N CDM groups and the L sub-radios.

[0162] Case three: the first correspondence relationship includes a correspondence relationship between the L sub-radios and the M time-frequency resources, and the M time-frequency resources are time-frequency resources corresponding to the N CDM groups.

[0163] Specifically, the M time-frequency resources correspond to the N CDM groups, and in this case, the first correspondence relationship includes a correspondence relationship between the L sub-radios and the M time-frequency resources, which can be understood as that the first correspondence relationship indicates a correspondence relationship between the N CDM groups and the L sub-radios.

[0164] Case four: the first correspondence relationship includes a correspondence relationship between the N CDM groups and the M time-frequency resources, and the M time-frequency resources are time-frequency resources mapped by the L sub-radios.

[0165] Specifically, the M time-frequency resources are time-frequency resources mapped by the L sub-radios, and in this case, the first correspondence relationship includes a correspondence relationship between the N CDM groups and the M time-frequency resources, which can be understood as that the first correspondence relationship indicates a correspondence relationship between the N CDM groups and the L sub-radios.

[0166] Further, in the embodiments of the present application, the terminal device can obtain the first correspondence relationship in a manner of direct indication or indirect indication by the network device.

[0167] Optionally, in a possible implementation manner, before step S310, the method can further include: the network device sends second indication information to the terminal device, the second indication information being used to indicate the first correspondence relationship, and correspondingly, the terminal device receives the second indication information.

[0168] The second indication information is used for indicating the first correspondence relationship, and can include the following two manners.

[0169] Manner one:

[0170] The second indication information directly indicates the first correspondence relationship. For example, the second indication information can directly indicate the correspondence relationship between the N CDM groups and the L sub-radii in the form of a literal language or a table.

[0171] For example, the second indication information can be in the form of a table.

[0172] For example, taking N=3 and L=4 as an example, the second indication information directly indicates the correspondence relationship between the identifiers of the 3 CDM groups and the identifiers of the 4 sub-radii in the form of a table, as shown in Table 2.

[0173] Table 2

[0174] It should be understood that the CDM group corresponding to the identifier 0 can be referred to as CDM group 0, the CDM group corresponding to the identifier 1 can be referred to as CDM group 1, and the CDM group corresponding to the identifier 2 can be referred to as CDM group 2. Correspondingly, the sub-radium corresponding to the identifier 0 can also be referred to as sub-radium 0, the sub-radium corresponding to the identifier 1 can also be referred to as sub-radium 1, and the sub-radium corresponding to the identifier 3 can also be referred to as sub-radium 3. For the sake of simplicity, the following will not be described in detail.

[0175] As can be seen from Table 2, the CDM group 0 corresponds to the sub-radium 0, the CDM group 1 corresponds to the sub-radium 1 and the sub-radium 2, and the CDM group 2 corresponds to the sub-radium 3.

[0176] It should be understood that the above is only an example, and the present application is not limited thereto.

[0177] Manner two:

[0178] The second indication information indirectly indicates the first correspondence relationship.

[0179] Optionally, in a possible implementation, the second indication information can be identification information of the first correspondence relationship.

[0180] Specifically, the terminal device can obtain a plurality of correspondence relationships in a protocol predefined manner, that is, the terminal device locally stores a plurality of correspondence relationships, and the plurality of correspondence relationships include the first correspondence relationship. The terminal device receives the second indication information, and at this time, the second indication information can be identification information of the first correspondence relationship. After receiving the second indication information (i.e., the identification information of the first correspondence relationship), the terminal device obtains the first correspondence relationship from the locally stored plurality of correspondence relationships according to the identification information of the first correspondence relationship.

[0181] The "identification information of the first correspondence" can also be replaced by "index of the first correspondence". For example, in the case of a table form of the first correspondence, the second indication information can be an index of the table. It should be understood that the present application does not limit this.

[0182] S320, the network device sends the first indication information to the terminal device, and correspondingly, the terminal device receives the first indication information.

[0183] Specifically, the first indication information is used to indicate the first CDM group, the first CDM group belongs to the N CDM groups, and the first CDM group is a CDM group without data transmission, or the first CDM group is a CDM group occupied by DMRS.

[0184] The first CDM group belongs to the N CDM groups, which can be understood as that the first CDM group is one or more of the N CDM groups.

[0185] Optionally, in a possible implementation, the first indication information is identification information of the first CDM group.

[0186] In this implementation, after receiving the identification information of the first CDM group, the terminal device selects a CDM group corresponding to the identification information of the first CDM group from the N CDM groups.

[0187] For example, in combination with Table 2, in the case that the first indication information is identification information of CDM group 0 (for example, the first indication information is identification 0), after receiving the identification 0, the terminal device selects CDM group 0 corresponding to the identification 0 from the N CDM groups. In this case, the first CDM group only includes CDM group 0.

[0188] For example, in combination with Table 2, in the case that the first indication information is identification information of CDM group 0 and identification information of CDM group 1 (for example, the first indication information includes identification 0 and identification 1), after receiving the identification 0 and the identification 1, the terminal device selects CDM group 0 and CDM group 1 corresponding to the identification 0 and the identification 1 respectively from the N CDM groups. In this case, the first CDM group can include CDM group 0 and CDM group 1.

[0189] Optionally, in a possible implementation, the value of the first indication information is related to the identification of the first CDM group.

[0190] Specifically, the value of the first indication information is related to the identification of the first CDM group, which can be understood as that the value of the first indication information is related to the identification of one or more CDM groups included in the first CDM group, or it can also be understood that the value of the first indication information corresponds to the identification of one or more CDM groups included in the first CDM group, as shown in Table 3.

[0191] Wherein, the identifier can be understood as identifier information, in this application, the identifier information and the identifier can be used alternatively.

[0192] Table 3

[0193] As shown in Table 3, when the value of the first indication information is "00", the corresponding CDM is identified as 0, i.e. CDM group 0; when the value of the first indication information is "01", the corresponding CDM is identified as 1, i.e. CDM group 1; when the value of the first indication information is "10", the corresponding CDM is identified as 2, i.e. CDM group 2; when the value of the first indication information is "11", the corresponding CDM is identified as 3 and 4, i.e. CDM group 3 and CDM group 4.

[0194] Further, after receiving the first indication information, the terminal device selects a CDM group corresponding to the value of the first indication information from the N CDM groups according to the value of the first indication information.

[0195] For example, in combination with Table 3, when the value of the first indication information is "00", after receiving the first indication information, the terminal device selects CDM group 0 corresponding to the value (e.g. 00) of the first indication information from the N CDM groups, in this case, the first CDM group only includes CDM group 0.

[0196] For example, when the value of the first indication information is "01", after receiving the first indication information, the terminal device selects CDM group 1 corresponding to the value (e.g. 01) of the first indication information from the N CDM groups, in this case, the first CDM group only includes CDM group 1.

[0197] For example, when the value of the first indication information is "10", after receiving the first indication information, the terminal device selects CDM group 2 corresponding to the value (e.g. 10) of the first indication information from the N CDM groups, in this case, the first CDM group only includes CDM group 2.

[0198] For example, when the value of the first indication information is "11", after receiving the first indication information, the terminal device selects CDM group 3 and CDM group 4 corresponding to the value (e.g. 11) of the first indication information from the N CDM groups, in this case, the first CDM group can include CDM group 3 and CDM group 4.

[0199] It should be understood that the above is only an example, which is not limited in the present application.

[0200] Optionally, in a possible implementation, the value of the first indication information is related to the number of the first CDM groups.

[0201] Specifically, the value of the first indication information is related to the number of the first CDM groups, which can be understood as that the value of the first indication information corresponds to the number of the CDM groups included in the first CDM groups. The correspondence between the value of the first indication information and the number of the first CDM groups is shown in Table 4.

[0202] Table 4

[0203] For example, in a case where the value of the first indication information is "1", the number of the CDM groups indicated by the first indication information is 1, at this time, the terminal device can be informed of which CDM group of the N CDM groups is selected through a protocol predefined manner, or the terminal device can be informed of which two CDM groups of the N CDM groups are selected through an additional indication information, for example, indication information #A.

[0204] For example, in a possible implementation, in a case where the value of the first indication information is "1", the terminal device can select CDM group 0 from the N CDM groups according to a protocol predefined manner after receiving the first indication information, at this time, the first CDM groups only include CDM group 0. Alternatively, the network device can also send indication information #A to the terminal device, where the indication information #A is used to indicate CDM group 0, for example, the indication information #A is the identifier of CDM group 0.

[0205] For example, in a case where the value of the first indication information is "2", the number of the CDM groups indicated by the first indication information is 2, at this time, the terminal device can be informed of which two CDM groups of the N CDM groups are selected through a protocol predefined manner, or the terminal device can be informed of which two CDM groups of the N CDM groups are selected through an additional indication information, for example, indication information #B.

[0206] For example, in a possible implementation, in a case where the value of the first indication information is "2", the terminal device can select CDM group 0 and CDM group 1 from the N CDM groups according to a protocol predefined manner after receiving the first indication information, at this time, the first CDM groups can include CDM group 0 and CDM group 1. Alternatively, the network device can also send indication information #B to the terminal device, where the indication information #B is used to indicate CDM group 0 and CDM group 1, for example, the indication information #B is the identifier of CDM group 0 and CDM group 1.

[0207] For example, in a possible implementation, when the value of the first indication information is "3", the terminal device can select CDM group 0, CDM group 1 and CDM group 2 from the N CDM groups according to a protocol predefinition after receiving the first indication information, and the first CDM group can include CDM group 0, CDM group 1 and CDM group 2. Alternatively, the network device can also send indication information #C to the terminal device, where the indication information #C is used to indicate CDM group 0, CDM group 1 and CDM group 2, for example, the indication information #C is the identifier of CDM group 0, CDM group 1 and CDM group 2.

[0208] For example, in a possible implementation, when the value of the first indication information is "3", the terminal device can select CDM group 0, CDM group 1 and CDM group 2 from the N CDM groups according to a protocol predefinition after receiving the first indication information, and the first CDM group can include CDM group 0, CDM group 1 and CDM group 2. Alternatively, the network device can also send indication information #C to the terminal device, where the indication information #C is used to indicate CDM group 0, CDM group 1 and CDM group 2, for example, the indication information #C is the identifier of CDM group 0, CDM group 1 and CDM group 2.

[0209] Optionally, in a possible implementation, the value of the first indication information is related to the identifier of the first CDM group and the number of the first CDM group.

[0210] Specifically, the value of the first indication information is related to the identifier of the first CDM group and the number of the first CDM group, which can be understood as that the value of the first indication information corresponds to the identifier and the number of the CDM group included in the first CDM group. That is, the value of the first indication information can correspond to the number of the CDM group, and at the same time, the value of the first indication information can also correspond to the identifier of the CDM group.

[0211] Table 5

[0212] As shown in Table 3, when the value of the first indication information is "1", the corresponding CDM group with identifier 0 is CDM group 0; when the value of the first indication information is "2", the corresponding CDM groups with identifier 0 and identifier 1 are CDM group 0 and CDM group 1; and when the value of the first indication information is "3", the corresponding CDM groups with identifier 0, identifier 1 and identifier 2 are CDM group 0, CDM group 1 and CDM group 2.

[0213] For example, in a possible implementation, when the value of the first indication information is "1", the terminal device can select the CDM group 0 corresponding to the first indication information (value 1) from the N CDM groups after receiving the first indication information, and in this case, the first CDM group includes one CDM group, that is, CDM group 0.

[0214] For example, in the case that the value of the first indication information is "2", the terminal device selects CDM group 0 and CDM group 1 corresponding to the first indication information (value 2) from the N CDM groups after receiving the first indication information, in which case the first CDM group can include 2 CDM groups, i.e., CDM group 0 and CDM group 1.

[0215] For example, in the case that the value of the first indication information is "3", the terminal device selects CDM group 0, CDM group 1 and CDM group 2 corresponding to the first indication information (value 3) from the N CDM groups after receiving the first indication information, in which case the first CDM group can include 3 CDM groups, i.e., CDM group 0, CDM group 1 and CDM group 2.

[0216] It should be understood that the above examples are only illustrative, and the present application is not limited in this regard.

[0217] S330, the terminal device does not perform data transmission on the time-frequency resources mapped by the first sub-beam based on the first CDM group and the first correspondence, wherein the first sub-beam is a sub-beam corresponding to the first CDM group.

[0218] Specifically, in step S320, the terminal device determines the first CDM group from the N CDM groups according to the first indication information, wherein the first CDM group is a CDM group that does not transmit data. Then, the terminal device determines the first sub-beam corresponding to the first CDM group based on the first CDM group and the first correspondence, and further, the terminal device does not perform data transmission on the time-frequency resources mapped by the first sub-beam.

[0219] It should be understood that the terminal device does not perform data transmission on the time-frequency resources mapped by the first sub-beam can be understood as the terminal device does not perform data reception or transmission on the time-frequency resources mapped by the first sub-beam.

[0220] The terminal device does not perform data transmission on the time-frequency resources mapped by the first sub-beam can include the following two cases:

[0221] Case one, the terminal device does not perform data transmission on all time-frequency resources of the port corresponding to the first sub-beam, wherein the port can refer to a DMRS port. For ease of description, hereinafter, port is used instead of DMRS port for description.

[0222] Case two, the terminal device does not perform data transmission on the first time-frequency resource of the port corresponding to the first sub-beam, wherein the first time-frequency resource is the time-frequency resource mapped by the first sub-beam.

[0223] For example, taking N=3 and L=5 as an example, Table 6 is the correspondence between the identifier of the CDM group and the identifier of the sub-beam.

[0224] Table 6

[0225] In a possible implementation, in a case where the terminal device determines, according to the first indication information, that the first CDM group is the CDM group 0, further, determines, based on the CDM group 0 and the first correspondence relationship, that the sub-raster corresponding to the CDM group 0 is the sub-raster 0. Then, the terminal device does not perform data transmission on the time-frequency resources mapped by the sub-raster 0.

[0226] In this implementation, corresponding to the case one, the terminal device does not perform data transmission on all time-frequency resources of the port corresponding to the sub-raster 0. Corresponding to the case two, the terminal device does not perform data transmission on the time-frequency resources mapped by the sub-raster 0 on the port corresponding to the sub-raster 0.

[0227] In a possible implementation, in a case where the terminal device determines, according to the first indication information, that the first CDM group is the CDM group 1, further, determines, based on the CDM group 1 and the first correspondence relationship, that the sub-raster corresponding to the CDM group 1 is the sub-raster 1 to the sub-raster 3. Then, the terminal device does not perform data transmission on the time-frequency resources mapped by the sub-raster 1 to the sub-raster 3.

[0228] In this implementation, corresponding to the case one, the terminal device does not perform data transmission on all time-frequency resources of the port corresponding to the sub-raster 1 to the sub-raster 3. Corresponding to the case two, the terminal device does not perform data transmission on the time-frequency resources mapped by the sub-raster 1 to the sub-raster 3 on the port corresponding to the sub-raster 1 to the sub-raster 3.

[0229] In a possible implementation, in a case where the terminal device determines, according to the first indication information, that the first CDM group is the CDM group 2, further, determines, based on the CDM group 2 and the first correspondence relationship, that the sub-raster corresponding to the CDM group 2 is the sub-raster 4. Then, the terminal device does not perform data transmission on the time-frequency resources mapped by the sub-raster 4.

[0230] In this implementation, corresponding to the case one, the terminal device does not perform data transmission on all time-frequency resources of the port corresponding to the sub-raster 4. Corresponding to the case two, the terminal device does not perform data transmission on the time-frequency resources mapped by the sub-raster 4 on the port corresponding to the sub-raster 4.

[0231] It should be noted that, in the present application, the time-frequency resources corresponding to each of the N CDM groups do not overlap, that is, the N CDM groups correspond to different time-frequency resources, where the case that the N CDM groups correspond to different time-frequency resources can be as follows.

[0232] Case one, the number of time-frequency resources corresponding to at least two CDM groups in the N CDM groups described above is different, that is, the time-frequency resources corresponding to the N CDM groups are unevenly distributed. For example, as shown in FIG. 4, the time-frequency resources corresponding to the CDM group 0 are 1 RE, the time-frequency resources corresponding to the CDM group 1 are 3 REs, and the time-frequency resources corresponding to the CDM group 2 are 2 REs.

[0233] Case two, the number of time-frequency resources corresponding to each CDM in the N CDM described above is the same, that is, the time-frequency resources corresponding to the N CDM groups are evenly distributed, or in other words, the DMRS pattern is regular. For example, as shown in FIG. 5, the time-frequency resources corresponding to the CDM group 0 are 2 REs, the time-frequency resources corresponding to the CDM group 1 are 2 REs, and the time-frequency resources corresponding to the CDM group 2 are 2 REs.

[0234] It should be noted that in case two, since the time-frequency resources corresponding to the N CDM groups are evenly distributed, the first indication information can directly indicate the number of CDM groups, and the terminal device can determine the first CDM group according to the first indication information and the protocol predefined manner. Regarding this case, detailed descriptions will be given in the embodiments below, which will not be repeated here.

[0235] It should be further noted that in the present application, before the network device sends the second indication information to the terminal device, the network device determines the L sub-radii based on the correlation threshold and / or the power threshold, and further determines the first correspondence, that is, the correspondence between the L sub-radii and the N CDM groups.

[0236] For example, in a possible implementation, the L sub-radii described above can be determined based on the correlation threshold. For example, the network device can determine the L sub-radii corresponding to the paired ports (i.e., DMRS ports) according to the following formula (1).

[0237] wherein V i represents the characteristic information of the i-th sub-radii, for example, a characteristic vector, V j represents the characteristic information of the j-th sub-radii, for example, a characteristic vector, c LX1 represents a sub-radii set with a size of Lx1, and Δ represents the correlation threshold. For ease of description, the i-th sub-radii is referred to as sub-radii i, and the j-th sub-radii is referred to as sub-radii j.

[0238] According to formula (1), when the correlation between the sub-radii i and the sub-radii j is less than the correlation threshold, the sub-radii i and the sub-radii j are selected as the sub-radii corresponding to the port, that is, the L sub-radii include the sub-radii i.

[0239] On the contrary, when the correlation between the sub-radiation i and the sub-radiation j is greater than or equal to the correlation threshold, one of the sub-radiation i and the sub-radiation j is selected as the sub-radiation corresponding to the port, i.e., the L sub-radiations include the sub-radiation i or the sub-radiation j, or the sub-radiation i and the sub-radiation j are not selected as the sub-radiation corresponding to the port, i.e., the L sub-radiations do not include the sub-radiation i and the sub-radiation j.

[0240] It should be understood that the correlation described above can be replaced by "similarity", "cosine similarity" and the like, which represent the similarity or correlation between different sub-radiations, and the present application does not limit this.

[0241] Optionally, in a possible implementation, the L sub-radiations described above can be determined based on a power threshold. For example, the network device can determine the L sub-radiations according to the following formula (2).

[0242] wherein Power i represents the power value of the sub-radiation i, P benchmark represents the power value of the main radiation, c LX1 represents the sub-radiation set with a size of Lx1, and xdB represents the power threshold.

[0243] It should be understood that the main radiation can be understood as the sub-radiation with the maximum power value, or can also be understood as the sub-radiation with the maximum power intensity, and the present application does not limit this.

[0244] In combination with the formula (2), when the ratio of the power value of the sub-radiation i to the power value of the main radiation is greater than the power threshold, the sub-radiation i is selected as the port corresponding sub-radiation, i.e., the L sub-radiations include the sub-radiation i.

[0245] On the contrary, when the ratio of the power value of the sub-radiation i to the power value of the main radiation is less than or equal to the power threshold, the sub-radiation i is not selected as the port corresponding sub-radiation, i.e., the L sub-radiations do not include the sub-radiation i.

[0246] It should be understood that the power described above can be replaced by "amplitude", "energy" and the like, which represent the power intensity characteristics of the sub-radiation, and the present application does not limit this.

[0247] Optionally, in a possible implementation, the L sub-radiations described above can also be determined based on the correlation threshold and the power threshold.

[0248] It should be understood that the above correlation threshold and power threshold are determined by the network device and the terminal device together. Among them, the above correlation threshold and power threshold can be determined by the network device and indicated to the terminal, or determined by the terminal device and fed back to the network device. Moreover, the above correlation threshold and power threshold related information can be periodically indicated or fed back, or triggered on demand. Further, the above correlation threshold and power threshold related information can be transmitted in the control channel or the data channel through dynamic signaling or semi-static signaling, and the application does not limit the signaling form or bearing design of the common negotiation interaction.

[0249] It should also be understood that the network device can determine the L sub-radii corresponding to the ports by other ways in addition to the correlation threshold and / or power threshold, which is not limited by the application.

[0250] According to the above technical solution, a rate matching indication method of DMRS suitable for data transmission in future communication networks (such as 6G networks) can be provided, which can save the overhead of indication signaling and further realize the throughput gain of MIMO system.

[0251] FIG. 6 is a schematic flowchart of a communication method 600 according to another embodiment of the application. It should be noted that the method 600 shown in FIG. 6 corresponds to the case one described above, that is, in the method 600 shown in FIG. 6, the time-frequency resources corresponding to the N CDM groups are unevenly distributed. As shown in FIG. 6, the method at least includes the following steps.

[0252] S610, the network device determines L sub-radii corresponding to L ports.

[0253] Among them, the L ports and the L sub-radii correspond one by one, and the network device determines the L sub-radii corresponding to the L ports based on the correlation threshold and / or the power threshold. It should be noted that the method for determining the L sub-radii by the network device can be determined as described above, which is not repeated here.

[0254] S620, the network device determines a first correspondence.

[0255] The first correspondence indicates the correspondence between the L sub-radii and the N CDM groups. For specific description of the first correspondence indicating the correspondence between the L sub-radii and the N CDM groups, please refer to the description above, which is not repeated here.

[0256] It should be noted that the network device can determine the correspondence between the L sub-radii and the N CDM groups based on whether at least one of the power value difference, the time delay difference and the Doppler difference of the L sub-radii satisfies the threshold condition.

[0257] For example, in a possible implementation, if the difference between the power values of the O sub-radiation in the L sub-radiation is less than the power threshold value, the O sub-radiation can correspond to the same CDM group. Conversely, if the difference between the power values of the O sub-radiation in the L sub-radiation is greater than or equal to the power threshold value, the O sub-radiation can correspond to different CDM groups.

[0258] For example, in a possible implementation, if the difference between the delay values of the O sub-radiation in the L sub-radiation is less than the delay value threshold value, the O sub-radiation can correspond to the same CDM group. Conversely, if the difference between the delay values of the O sub-radiation in the L sub-radiation is greater than or equal to the delay value threshold value, the O sub-radiation can correspond to different CDM groups.

[0259] For example, in a possible implementation, if the difference between the Doppler values of the O sub-radiation in the L sub-radiation is less than the Doppler value threshold value, the O sub-radiation can correspond to the same CDM group. Conversely, if the difference between the Doppler values of the O sub-radiation in the L sub-radiation is greater than or equal to the Doppler threshold value, the O sub-radiation can correspond to different CDM groups.

[0260] It should be noted that O≤L, and in the extreme case, when O=L, it can be understood that one CDM group corresponds to one sub-radiation, in other words, the ports corresponding to the L sub-radiation all use frequency division multiplexing.

[0261] For example, taking N=4 and L=7 as an example, the first correspondence relationship is the correspondence relationship between the identifier of the CDM group and the identifier of the sub-radiation.

[0262] Table 7

[0263] As shown in Table 7, CDM group 0 corresponds to sub-radiation 0, CDM group 1 corresponds to sub-radiation 1 to sub-radiation 3, CDM group 2 corresponds to sub-radiation 4, and CDM group 3 corresponds to sub-radiation 5 and sub-radiation 6.

[0264] It should be noted that the time-frequency resources corresponding to the four CDM groups are not uniformly distributed, as shown in FIG. 7, the time-frequency resource corresponding to CDM group 0 is RE0, the time-frequency resource corresponding to CDM group 1 is RE1 to RE3, the time-frequency resource corresponding to CDM group 2 is RE4, and the time-frequency resource corresponding to CDM group 3 is RE5 and RE6.

[0265] It should be understood that Table 7 and FIG. 7 are only for illustration, and the present application is not limited thereto.

[0266] S630, the network device sends second indication information to the terminal device, and correspondingly, the terminal device receives the second indication information.

[0267] The second indication information is used for directly or indirectly indicating the first correspondence relationship, and the terminal device determines the first correspondence relationship according to the received second indication information. The specific description of the second indication information can refer to the foregoing description, which will not be repeated here.

[0268] In S640, the network device sends the first indication information to the terminal device, and correspondingly, the terminal device receives the first indication information.

[0269] Specifically, the first indication information is used for indicating the first CDM group, wherein the first CDM group is a CDM group without data transmission, and the first CDM group is one or more of the N CDM groups.

[0270] Optionally, in a possible implementation, the first indication information can be identification information of the first CDM group. The specific description of the first indication information being the identification information of the first CDM group can refer to the foregoing description, which will not be repeated here.

[0271] Optionally, in a possible implementation, the first indication information is related to the identification of the first CDM group and / or the number of the first CDM group. The specific description of the first indication information being related to the identification of the first CDM group and / or the number of the first CDM group can refer to the foregoing description, which will not be repeated here.

[0272] In S650, the terminal device determines the first sub-beam according to the first CDM group and the first correspondence relationship, and does not perform data transmission on the time-frequency resource mapped by the first sub-beam.

[0273] For example, taking the first CDM group as CDM group 1 and CDM group 2 as an example, the terminal device determines that the CDM group 1 corresponds to sub-beams 1 to 3 and the CDM group 2 corresponds to sub-beam 4 according to the first CDM group and the first correspondence relationship, as shown in Table 7.

[0274] Optionally, in a possible implementation, the terminal device knows that the sub-beam and the RE are in one-to-one correspondence according to a protocol predefined manner, that is, sub-beams 1 to 3 correspond to REs 1 to 3, and sub-beam 4 corresponds to RE 4, as shown in FIG. 7.

[0275] Optionally, in a possible implementation, before or after S650, the method further includes: the network device sends indication information #1 to the terminal device, and the indication information #1 is used for indicating the correspondence relationship between the N CDM groups and the M time-frequency resources, wherein M≥N, and M and N are positive integers.

[0276] As shown in FIG. 7, the terminal device can determine, according to the indication information #1, that the time-frequency resource corresponding to the CDM group 0 is RE0, the time-frequency resource corresponding to the CDM group 1 is RE1-RE3, the time-frequency resource corresponding to the CDM group 2 is RE4, and the time-frequency resource corresponding to the CDM group 3 is RE5 and RE6.

[0277] For example, in combination with Table 7, taking the first CDM group as the CDM group 1 and the CDM group 2 as an example, the terminal device can determine, according to the first CDM group and the first correspondence relationship, that the sub-ray corresponding to the CDM group 1 is sub-ray 1-sub-ray 3, and the sub-ray corresponding to the CDM group 2 is sub-ray 4.

[0278] Further, the terminal device can determine, according to the indication information #1, that the time-frequency resource corresponding to the CDM group 1 is RE1-RE3, and the time-frequency resource corresponding to the CDM group 2 is RE4, that is, the terminal device determines that sub-ray 1-sub-ray 3 correspond to RE1-RE3, and sub-ray 4 corresponds to RE4.

[0279] Then, the terminal device does not perform data transmission on RE1-RE4. For example, the terminal device includes UE1 and UE2, at this time, UE1 not only does not perform data transmission on the time-frequency resource RE1-RE4 corresponding to itself, but also does not perform data transmission on the time-frequency resource RE4 corresponding to UE2.

[0280] According to the above technical solution, a data transmission DMRS rate matching indication method suitable for a future communication network (for example, a 6G network) can be provided, which can save the overhead of indication signaling and further realize the throughput gain of a MIMO system.

[0281] FIG. 8 is a schematic flowchart of a communication method 800 provided by another embodiment of the present application. It should be noted that the method 800 shown in FIG. 8 corresponds to the second case described above, that is, in the method 800 shown in FIG. 8, the time-frequency resources corresponding to the N CDM groups are uniformly distributed. As shown in FIG. 8, the method at least includes the following steps.

[0282] S810, the network device determines L sub-rays corresponding to L ports.

[0283] Step S810 is similar to step S610, which will not be described here.

[0284] S820, the network device determines a first correspondence relationship.

[0285] The first correspondence relationship indicates the correspondence relationship between the L sub-rays and the N CDM groups. For specific description of the first correspondence relationship between the L sub-rays and the N CDM groups, reference can be made to the foregoing description, which will not be described here.

[0286] For example, as shown in Table 7, taking N=4 and L=7 as an example, the first correspondence is the correspondence between the identifier of the CDM group and the identifier of the sub-radius.

[0287] It should be noted that the time-frequency resources corresponding to the four CDM groups described in Table 7 are uniformly distributed, as shown in FIG. 9. The time-frequency resources corresponding to CDM group 0 are RE0 and RE1, the time-frequency resources corresponding to CDM group 1 are RE2 and RE3, the time-frequency resources corresponding to CDM group 2 are RE4 and RE5, and the time-frequency resources corresponding to CDM group 3 are RE6 and RE7.

[0288] It should be understood that FIG. 8 is only an example, that is, the time-frequency resources corresponding to each of the four CDM groups can also be three REs, and the present application does not limit the number of REs corresponding to each CDM group.

[0289] S830, the network device sends second indication information to the terminal device, and correspondingly, the terminal device receives the second indication information.

[0290] Step S830 is similar to step S630, which will not be described here.

[0291] S840, the network device sends first indication information to the terminal device, and correspondingly, the terminal device receives the first indication information.

[0292] Unlike the foregoing, in the embodiment shown in FIG. 8, the time-frequency resources corresponding to the N CDM groups are uniformly distributed, and at this time, the first indication information can be related to the number of CDM groups.

[0293] For example, when the first indication information takes the value "1", the number of corresponding CDM groups is 1, and at this time, the terminal device determines the first CDM group to be CDM group 0 after receiving the first indication information.

[0294] For example, when the first indication information takes the value "2", the number of corresponding CDM groups is 2, and at this time, the terminal device determines the first CDM group to be CDM group 0 and CDM group 1 after receiving the first indication information.

[0295] For example, when the first indication information takes the value "3", the number of corresponding CDM groups is 3, and at this time, the terminal device determines the first CDM group to be CDM group 0, CDM group 1, and CDM group 3 after receiving the first indication information.

[0296] It should be understood that the above is only an example, and the present application does not limit this.

[0297] S850, the terminal device determines a first sub-radius according to the first CDM group and the first correspondence, and does not perform data transmission on the time-frequency resources mapped by the first sub-radius.

[0298] For example, in combination with Table 7, taking CDM group 1 and CDM group 2 as an example, the terminal device determines, according to the first CDM group and the first correspondence relationship, that the sub-ranges corresponding to the CDM group 1 are sub-range 1 to sub-range 3, and the sub-ranges corresponding to the CDM group 2 are sub-range 4.

[0299] Further, as shown in FIG. 9, since the time-frequency resources corresponding to the N CDM groups are uniformly distributed, the terminal device can directly determine that the time-frequency resources corresponding to the CDM group 1 are RE2 and RE3, and the time-frequency resources corresponding to the CDM group 2 are RE4 and RE5, that is, the terminal device determines that sub-range 1 to sub-range 3 correspond to RE2 and RE3, and sub-range 4 corresponds to RE4 and RE5.

[0300] Then, the terminal device does not perform data transmission on RE2 to RE5. For example, the terminal device includes UE1 and UE2, at this time, UE1 not only does not perform data transmission on the time-frequency resources RE2 and RE3 corresponding to itself, but also does not perform data transmission on the time-frequency resources RE4 and RE5 corresponding to UE2.

[0301] According to the above technical solution, a data transmission DMRS rate matching indication method suitable for future communication networks (such as 6G networks) can be provided, which can save the overhead of indication signaling and further realize the throughput gain of the MIMO system.

[0302] FIG. 10 is a schematic flowchart of a communication method 1000 provided by an embodiment of the present application. As shown in FIG. 10, the method can at least include the following steps.

[0303] S1010, the network device sends third indication information to the terminal device, and correspondingly, the terminal device receives the third indication information.

[0304] Specifically, the third indication information is used to indicate X sub-ranges, wherein the X sub-ranges correspond to X ports one by one, and X is a positive integer. It should be noted that the X sub-ranges can be understood as all the sub-ranges perceived by the base station in a certain environment, or the X ports can be understood as all the ports perceived by the base station in a certain environment. Wherein, the port can be understood as the DMRS port.

[0305] In the embodiment of the present application, the X sub-ranges can be determined by the network device based on the perception information or the measurement information. For example, the network device obtains the sub-range information corresponding to all the ports in the environment based on the perception information or the long-term measurement information.

[0306] It should be understood that the sub-range information can include the number of sub-ranges, the ports corresponding to the sub-ranges, the identification of the sub-ranges, the time-frequency resources mapped by the sub-ranges, etc., which are not limited in the present application.

[0307] Optionally, in a possible implementation, the X sub-ranges can be determined based on a reference signal in addition to the perception information, for example, the reference signal can be a CSI-RS.

[0308] S1020, the terminal device does not perform data transmission on the time-frequency resources corresponding to the X ports according to the third indication information.

[0309] It can be understood that not performing data transmission on the time-frequency resources corresponding to the X ports means not performing data transmission on all time-frequency resources corresponding to the X ports. Specifically, after receiving the third indication information, the terminal device determines the X sub-ranges according to the third indication information, and further does not perform data transmission on the X ports corresponding to the X sub-ranges.

[0310] Optionally, in a possible implementation, the third indication information described above is carried in high-layer signaling. For example, the third indication information can be carried in RRC signaling.

[0311] Optionally, in a possible implementation, the third indication information described above is semi-statically configured or periodically configured.

[0312] Specifically, the third indication information can not be indicated in real time with the change of the MU configuration state, and the configuration period is relatively long.

[0313] Optionally, the terminal device can trigger the third indication information to be updated based on changes in the surrounding environment.

[0314] Alternatively, optionally, the terminal device can also request to switch the signaling format of the third indication information based on its service state, such as a decrease in the number of paired streams.

[0315] Alternatively, optionally, the terminal device can also request to switch the judgment of the sub-range information based on its service state, such as a decrease in the number of paired streams, such as power threshold, correlation threshold, threshold, etc.

[0316] It should be noted that before performing step S1010 and step S1020, the pilot scheme needs to be determined first. The pilot scheme refers to the configuration mode of the DMRS.

[0317] According to the above technical solution, a DMRS rate matching (RM) indication method suitable for future communication networks (such as 6G networks) in data transmission can be provided, which can save the overhead of indication signaling, and further realize the throughput gain of the MIMO system. Further, a semi-static or long-period RM configuration mode can be realized, further reducing the DMRS RM configuration overhead.

[0318] The communication method provided in the present application is described in detail above, and the communication apparatus provided in the present application is introduced below. In a possible implementation, the apparatus is used to implement the steps or processes corresponding to the terminal device in the method embodiments described above. In another possible implementation, the apparatus is used to implement the steps or processes corresponding to the network device in the method embodiments described above.

[0319] FIG. 11 is a schematic block diagram of the communication apparatus 1100 provided in the embodiments of the present application. As shown in FIG. 11, the apparatus 1100 can include a communication unit 1110 and a processing unit 1120. The communication unit 1110 can communicate with the outside, and the processing unit 1120 is used for data processing. The communication unit 1110 can also be referred to as a communication interface or a transceiver unit.

[0320] In a possible design, the apparatus 1100 can implement the steps or processes corresponding to the network device performing in the method embodiments described above, in which the processing unit 1120 is used to perform the processing-related operations of the network device in the method embodiments described above, and the communication unit 1110 is used to perform the sending-related operations of the network device in the method embodiments described above.

[0321] In another possible design, the apparatus 1100 can implement the steps or processes corresponding to the terminal device performing in the method embodiments described above, in which the communication unit 1110 is used to perform the receiving-related operations of the terminal device in the method embodiments described above, and the processing unit 1120 is used to perform the processing-related operations of the terminal device in the method embodiments described above.

[0322] It should be understood that the apparatus 1100 herein is embodied in the form of functional units. The term “unit” herein can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (for example, a shared processor, a dedicated processor or a group processor and the like) and a memory for executing one or more software or firmware programs, a combination of logical circuit and / or other suitable components supporting the described functions. In an optional example, those skilled in the art can understand that the apparatus 1100 can be specifically embodied as the network device in the above-described embodiments, and can be used to perform the processes and / or steps corresponding to the network device in the above-described method embodiments, or the apparatus 1100 can be specifically embodied as the terminal device in the above-described embodiments, and can be used to perform the processes and / or steps corresponding to the terminal device in the above-described method embodiments. To avoid repetition, details are not described herein.

[0323] The apparatus 1100 of each of the above-mentioned solutions has a function of implementing the corresponding steps performed by the network device in the above-mentioned methods, or the apparatus 1100 of each of the above-mentioned solutions has a function of implementing the corresponding steps performed by the terminal device in the above-mentioned methods. 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-mentioned functions; for example, the communication unit can be replaced by a transceiver (for example, the sending unit in the communication unit can be replaced by a transmitter, and the receiving unit in the communication unit can be replaced by a receiver), and other units such as the processing unit can be replaced by a processor, which respectively performs the transceiving operations and related processing operations in each method embodiment.

[0324] In addition, the communication unit can also be a transceiving circuit (for example, can include a receiving circuit and a sending circuit), and the processing unit can be a processing circuit. In an embodiment of the present application, the apparatus in FIG. 11 can be a terminal device or a network device in the foregoing embodiments, or can be a chip or a chip system, for example, a system on chip (SoC). The communication unit can be an input / output circuit, a communication interface; and the processing unit can be a processor or a microprocessor integrated on the chip or an integrated circuit. In this regard, no limitation is made.

[0325] FIG. 12 is a schematic block diagram of a communication apparatus 1200 provided by an embodiment of the present application. The apparatus 1200 includes a processor 1210 and a transceiver 1220. The processor 1210 and the transceiver 1220 communicate with each other through an internal connection path. The processor 1210 is configured to execute instructions to control the transceiver 1220 to send and / or receive signals.

[0326] Optionally, the apparatus 1200 can further include a memory 1230, which communicates with the processor 1210 and the transceiver 1220 through an internal connection path. The memory 1230 is configured to store instructions, and the processor 1210 can execute the instructions stored in the memory 1230. In one possible implementation, the apparatus 1200 is configured to implement the corresponding processes and steps of the network device in the above-mentioned method embodiments. In another possible implementation, the apparatus 1200 is configured to implement the corresponding processes and steps of the terminal device in the above-mentioned method embodiments.

[0327] It should be understood that the apparatus 1200 can be specifically a network device or a terminal device in the above-described embodiments, or can be a chip or a chip system. Correspondingly, the transceiver 1220 can be a transceiver circuit of the chip, which is not limited here. Specifically, the apparatus 1200 can be configured to perform various steps and / or processes in the above-described method embodiments corresponding to the network device or the terminal device. Optionally, the memory 1230 can include a read-only memory and a random access memory, and provide instructions and data for the processor. A part of the memory can also include a non-volatile random access memory. For example, the memory can also store device type information. The processor 1210 can be configured to execute instructions stored in the memory, and when the processor 1210 executes the instructions stored in the memory, the processor 1210 is configured to perform various steps and / or processes in the above-described method embodiments corresponding to the network device or the terminal device.

[0328] In the implementation process, the steps of the above-described method can be completed by integrated logic circuits of hardware in the processor or instructions in the form of software. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as completed by a hardware processor, or completed by a combination of hardware and software modules in the processor. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, or other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above-described method. To avoid repetition, it will not be described in detail here.

[0329] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with a signal processing capability. In the implementation process, the steps of the above method embodiments can be completed by the integrated logic circuit or the instruction in the form of software in the processor. The processor mentioned above can be a general processor, a digital signal processing (DSP), an ASIC, a field-programmable gate array (FPGA) or other programmable logic devices, a discrete gate or transistor logic device, a discrete hardware component. The processor in the embodiments of the present application can realize or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general processor can be a microprocessor or the processor can also be any conventional processor and the like. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as a hardware code processor for execution, or be executed by a combination of hardware and software modules in the code processor. The software module can be located in a random memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register or other mature storage medium in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above method.

[0330] It is to be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. 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) used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM) and direct rambus RAM (DR RAM). It should be noted that the memory of the system and method described herein is intended to include, but not limited to, these and any other suitable types of memory

[0331] It should be noted that when the processor is a general processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated in the processor.

[0332] In addition, the present application also provides a computer readable storage medium, the computer readable storage medium has computer instructions stored therein, when the computer instructions run on the computer, the operations and / or processes performed by the network device or the terminal device in the method embodiments of the present application are executed.

[0333] The present application also provides a computer program product, the computer program product includes computer program code or instructions, when the computer program code or instructions run on the computer, the operations and / or processes performed by the network device or the terminal device in the method embodiments of the present application are executed.

[0334] Further, the present application provides a chip, which comprises a processor. A memory for storing a computer program is arranged independently of the chip, and the processor is configured to execute the computer program stored in the memory, so that the operations and / or processes performed by the network device or the terminal device in any one of the method embodiments are performed.

[0335] Further, the chip can further comprise a communication interface. The communication interface can be an input / output interface, an interface circuit, or the like. Further, the chip can further comprise a memory.

[0336] Further, the present application provides a communication system comprising the network device and the terminal device in the embodiments of the present application.

[0337] It should be further noted that the memory described herein is intended to include, but not limited to, these and any other suitable type of memory.

[0338] Those skilled in the art can understand that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software 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.

[0339] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0340] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented by other manners. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, 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.

[0341] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0342] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0343] If the functions are realized in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0344] 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 scope 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 by comprising: The method comprises the following steps: obtaining a first correspondence relationship, the first correspondence relationship indicating a correspondence relationship between N code division multiplexing (CDM) groups and L sub-radiates, L≥N, and L and N are positive integers; receiving first indication information, the first indication information being used for indicating a first CDM group, the first CDM group belonging to the N CDM groups, and the first CDM group being a CDM group in which no data is transmitted; based on the first CDM group and the first correspondence relationship, no data transmission is performed on time-frequency resources mapped by a first sub-radiate, the first sub-radiate being a sub-radiate corresponding to the first CDM group.

2. The method of claim 1, wherein, The first correspondence relationship indicates a correspondence relationship between N CDM groups and L sub-radiates, and includes any one of the following: The first correspondence relationship includes a one-to-one correspondence relationship between L ports and the L sub-radiates, the L ports being ports corresponding to the N CDM groups; The first correspondence relationship includes a correspondence relationship between the N CDM groups and L ports, the L ports and the L sub-radiates being in one-to-one correspondence; The first correspondence relationship includes a correspondence relationship between the L sub-radiates and M time-frequency resources, the M time-frequency resources being time-frequency resources corresponding to the N CDM groups.

3. The method of claim 1 or 2, wherein: a number of time-frequency resources corresponding to each of the N CDM groups is the same; or a number of time-frequency resources corresponding to at least two of the N CDM groups is different.

4. The method according to any one of claims 1 to 3, characterized in that, The no data transmission on the time-frequency resources mapped by the first sub-radiate includes: no data transmission is performed on all time-frequency resources of a port corresponding to the first sub-radiate; or no data transmission is performed on first time-frequency resources of the port corresponding to the first sub-radiate, the first time-frequency resources being time-frequency resources mapped by the first sub-radiate.

5. The method according to any one of claims 1 to 4, characterized in that, A value of the first indication information is related to an identifier of the first CDM group and / or a number of the first CDM group.

6. The method according to any one of claims 1 to 4, characterized in that, The first indication information is identifier information of the first CDM group.

7. The method according to any one of claims 1 to 6, characterized in that, The obtaining of the first correspondence relationship includes: receiving second indication information, the second indication information being used for indicating the first correspondence relationship.

8. The method of claim 7, wherein, The second indication information is identifier information of the first correspondence relationship.

9. The method according to any one of claims 1 to 8, characterized in that, The L sub-radiates are determined based on a correlation threshold and / or a power threshold.

10. A communication method characterized by comprising: The method comprises the following steps: receiving third indication information, the third indication information being used for indicating X sub-radiates, the X sub-radiates being in one-to-one correspondence with X ports; according to the third indication information, no data transmission is performed on time-frequency resources corresponding to the X ports; wherein X is a positive integer.

11. The method of claim 10, wherein, The X sub-radiates are determined based on sensing information.

12. The method according to claim 10 or 11, characterized in that, The third indication information is carried in high-layer signaling.

13. The method according to any one of claims 10 to 12, characterized in that, The third indication information is semi-statically configured or periodically configured.

14. A communication method, comprising: The method comprises the following steps: determining a first correspondence relationship, the first correspondence relationship indicating a correspondence relationship between N CDM groups and L sub-radiates, L≥N, and L and N being positive integers; sending first indication information, the first indication information being used for indicating a first CDM group, the first CDM group belonging to the N CDM groups, and the first CDM group being a CDM group in which no data is transmitted, The first CDM group and the first correspondence relationship are used to determine a first sub-radius, time-frequency resources mapped by the first sub-radius do not perform data transmission, and the first sub-radius is a sub-radius corresponding to the first CDM group.

15. The method of claim 14, wherein, The first correspondence relationship indicates a correspondence relationship between the N CDM groups and the L sub-radii, and includes any one of the following: The first correspondence relationship includes a one-to-one correspondence relationship between the L ports and the L sub-radii, and the L ports are ports corresponding to the N CDM groups. The first correspondence relationship includes a correspondence relationship between the N CDM groups and L ports, and the L ports and the L sub-radii are in a one-to-one correspondence. The first correspondence relationship includes a correspondence relationship between the L sub-radii and M time-frequency resources, and the M time-frequency resources are time-frequency resources corresponding to the N CDM groups.

16. A method of communication, comprising: The method comprises: sending third indication information, the third indication information being used to indicate X sub-radii, the X sub-radii being in a one-to-one correspondence with X ports, time-frequency resources corresponding to the X ports not performing data transmission, wherein X is a positive integer.

17. A communications device, characterized by The communication device comprises a processor, the processor being used to, by executing computer programs or instructions, or by a logic circuit, enable the communication device to perform the method in any one of claims 1 to 16.

18. A communications device, characterized by The communication device comprises a logic circuit and an input / output interface, the input / output interface being used to input and / or output signals, and the logic circuit being used to perform the method in any one of claims 1 to 16.

19. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer programs or instructions, and when the computer programs or the instructions run on a computer, the method in any one of claims 1 to 16 is executed.

20. A computer program product, characterised in that, The computer readable storage medium stores computer programs or instructions, and when the computer programs or the instructions run on a computer, the method in any one of claims 1 to 16 is executed.

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