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WO2025112637A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2025112637A1
WO2025112637A1 PCT/CN2024/110822 CN2024110822W WO2025112637A1 WO 2025112637 A1 WO2025112637 A1 WO 2025112637A1 CN 2024110822 W CN2024110822 W CN 2024110822W WO 2025112637 A1 WO2025112637 A1 WO 2025112637A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna ports
dmrs antenna
dmrs
pdcch
terminal device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/110822
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English (en)
French (fr)
Inventor
侯海龙
郭志恒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2025112637A1 publication Critical patent/WO2025112637A1/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present application relates to the field of communication technology, and in particular to a communication method and device.
  • MU-MIMO multi-user multiple-input multiple-output
  • NR new radio
  • the demodulation reference signals (DMRS) of multiple PDCCHs may not be able to ensure orthogonality, which will limit the PDCCH demodulation performance and affect the PDCCH capacity.
  • the present application provides a communication method and device, which can improve the PDCCH demodulation performance and capacity.
  • the present application adopts the following technical solutions:
  • a communication method is provided.
  • the method can be executed by a network device.
  • the "network device” in this application can refer to the network device itself, or a component in the network device (for example, a processor, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the network device functions.
  • the following is described by taking the execution subject as the network device as an example.
  • the method includes:
  • the network device determines L DMRS antenna ports from N demodulation reference signal DMRS antenna ports, the N DMRS antenna ports are used for physical downlink control channel PDCCH transmission, and any two DMRS antenna ports among the N DMRS antenna ports are orthogonally multiplexed through at least one of the following: time division multiplexing TDM, frequency division multiplexing FDM, or code division multiplexing CDM.
  • N is a positive integer greater than or equal to 2
  • L is a positive integer less than or equal to N.
  • the network device sends the DMRS of the first PDCCH through the L DMRS antenna ports.
  • the TDM between any two DMRS antenna ports means that different DMRS antenna ports are associated with or use different time domain resources.
  • the PDCCH DMRS transmitted on different DMRS antenna ports can use different time domain resources, thereby ensuring that the DMRS of different PDCCHs are orthogonal to each other.
  • the FDM between any two DMRS antenna ports means that different DMRS antenna ports are associated with or use different frequency domain resources.
  • the PDCCH DMRS transmitted on different DMRS antenna ports can use different frequency domain resources, thereby ensuring that the DMRS of different PDCCHs are orthogonal to each other.
  • the CDM between any two DMRS antenna ports means that different DMRS antenna ports are associated or use different orthogonal masks OCC.
  • the PDCCH DMRS transmitted on different DMRS antenna ports can use different orthogonal masks, thereby ensuring that the DMRS of different PDCCHs are orthogonal to each other.
  • the network device sends the DMRS of the first PDCCH through the L DMRS antenna ports, including: the network device sends the DMRS of the first PDCCH through at least one of the time domain resources, frequency domain resources, or orthogonal mask codes OCC associated with the L DMRS antenna ports, and the L DMRS antenna ports.
  • the first PDCCH also includes data information.
  • the network device sends the data information of the first PDCCH through the L DMRS antenna ports, including: the network device sends the data information of the first PDCCH through the L antenna ports, instead of using any one of the time domain resources, frequency domain resources and OCC associated with the L DMRS antenna ports to send the data information of the first PDCCH.
  • the network device may further perform the following operation: the network device determines L' DMRS antenna ports from the N DMRS antenna ports, and any one of the L' DMRS antenna ports is different from any one of the L DMRS antenna ports.
  • L' is a positive integer less than or equal to N.
  • the network device sends the DMRS of the second PDCCH through the L' DMRS antenna ports.
  • the second PDCCH is different from the first PDCCH.
  • the N DMRS antenna ports can be used for PDCCH transmission and the N DMRS antenna ports are orthogonal to each other, different PDCCH DMRS are transmitted through different DMRS antenna ports among the N DMRS antenna ports.
  • the DMRSs of different PDCCHs are made orthogonal to each other, for example, the DMRS of the first PDCCH is orthogonal to the DMRSs of other PDCCHs, which helps to improve the PDCCH demodulation performance and PDCCH capacity and ensure the PDCCH performance.
  • different frequency domain orthogonal mask codes OCC and/or different time domain OCC are associated between any two of the N DMRS antenna ports, so that any two of the above DMRS antenna ports are orthogonal to each other.
  • the N DMRS antenna ports belong to at least two CDM groups, and each of the at least two CDM groups includes a portion of the N DMRS antenna ports.
  • the number of DMRS antenna ports included in different CDM groups in the at least two CDM groups may be the same or different.
  • Different frequency domain OCCs and/or different time domain OCCs are associated between any two DMRS antenna ports in any one of the at least two CDM groups, so that any two DMRS antenna ports in each CDM group are orthogonal to each other.
  • Different frequency domain resources are associated between any two CDM groups of the at least two CDM groups, so that any two DMRS antenna ports between different CDM groups are orthogonal to each other.
  • the transmission resources of the first PDCCH include multiple resource element groups REGs, each of the multiple REGs includes M first resource elements RE, and the M first REGs are used to carry DMRS of the PDCCH, where M is a positive integer greater than 3.
  • Each of the multiple REGs includes one orthogonal frequency division multiplexing OFDM symbol in the time domain and one resource block RB in the frequency domain.
  • the N DMRS antenna ports can support the associated frequency domain OCC, avoid excessive DMRS overhead, and ensure DMRS performance.
  • the time domain resources of the first PDCCH include K symbols, and the K symbols include a first symbol and a second symbol.
  • K is a positive integer greater than or equal to 2.
  • the first PDCCH includes data information of the first PDCCH and a DMRS of the first PDCCH.
  • the data information of the first PDCCH occupies the first symbol, and the DMRS of the first PDCCH occupies the second symbol. That is, the data information of the first PDCCH and the DMRS of the first PDCCH are transmitted in a TDM manner.
  • the length of the frequency domain OCC is 2 or 4
  • the length of the time domain OCC is 2 or 4.
  • the value of N includes 2T or 3*Q, where T and Q are positive integers.
  • N includes one of the following: 2, 3, 4, 6, 8, 12, or 16.
  • the method further includes: the network device sending first information.
  • the first information indicates the L antenna ports.
  • the first information is carried in one of the following: radio resource control RRC signaling, system broadcast information block SIB, downlink control information DCI, or media access control layer control element MAC CE.
  • the network device indicates to the first terminal device: through which DMRS antenna port(s) the first PDCCH is detected, so as to simplify the computational complexity on the terminal device side.
  • the first SS set is all SS sets associated with all control resource sets CORESET of the first terminal device. That is to say, the network device indicates the DMRS antenna port at the terminal device granularity through the first information.
  • the first SS set is all SS sets associated with all CORESETs on the first bandwidth part BWP
  • the first BWP is one BWP among all BWPs of the first terminal device. That is, the network device indicates the DMRS antenna port with BWP granularity through the first information.
  • the first SS set is all SS sets associated with the first CORESET
  • the first CORESET is one CORESET among all CORESETs of the first terminal device. That is, the network device indicates the DMRS antenna port at the CORESET granularity through the first information.
  • the first SS set is one of all SS sets of the first terminal device. That is, the network device indicates the DMRS antenna port at the SS set granularity through the first information.
  • the first information indicating the L antenna ports includes: the first information indicating that the first terminal device uses the L DMRS antenna ports to detect the first PDCCH in all SS sets associated with the first CORESET group, and the The first CORESET group is one CORESET group among all CORESET groups of the first terminal device. That is, the network device indicates the DMRS antenna port at the CORESET group granularity through the first information.
  • the first information indicates the L antenna ports, including: the first information indicates that the first terminal device uses the L DMRS antenna ports on a first SS set group to detect the first PDCCH, and the first SS set group is one SS set group among all SS set groups of the first terminal device. That is, the network device indicates the DMRS antenna ports at the SS set group granularity through the first information.
  • the DCI corresponds to a first terminal device group, and the first terminal device group includes at least one terminal device.
  • the first information is carried in a first information block of the DCI, and the first information block corresponds to one or more terminal devices in the first terminal device group, and the one or more terminal devices include the first terminal device.
  • the network device indicates DMRS antenna ports for different terminal devices through the same DCI.
  • the L DMRS antenna ports are determined based on a radio network temporary identifier RNTI of the first terminal device, such as a cell radio network temporary identifier C-RNTI of the first terminal device.
  • n RNTI represents the value of the RNTI
  • mod is a modulo operation
  • the L DMRS antenna ports are determined according to a radio network temporary identifier RNTI of the first terminal device and a number of the first time unit.
  • the RNTI of the first terminal device may be a C-RNTI.
  • L 1.
  • n RNTI represents the value of the RNTI.
  • a and D are positive integers, and mod is a modulo operation.
  • the L DMRS antenna ports are determined according to the radio network temporary identifier RNTI of the first terminal device, the number of the first time unit, and the number of the first CORESET.
  • the RNTI of the first terminal device may be a C-RNTI.
  • L 1.
  • n RNTI represents the value of the RNTI.
  • p represents the number of the first CORESET
  • D is a positive integer
  • Ap is a positive integer determined according to p
  • mod is a modulo operation.
  • a communication method is provided.
  • the method can be executed by a first terminal device.
  • the "first terminal device” in this application can refer to the first terminal device itself, or a component in the first terminal device (for example, a processor, a chip, or a chip system, etc.), or a logic module or software that can realize all or part of the functions of the first terminal device.
  • the execution subject is described as the first terminal device.
  • the method includes: the first terminal device determines L demodulation reference signal DMRS antenna ports, the L DMRS antenna ports are one or more DMRS antenna ports among N DMRS antenna ports, the N DMRS antenna ports are used for physical downlink control channel PDCCH transmission, and any two DMRS antenna ports among the N DMRS antenna ports are orthogonally multiplexed by at least one of the following: time division multiplexing TDM, frequency division multiplexing FDM, or code division multiplexing CDM.
  • N is a positive integer greater than or equal to 2
  • L is a positive integer less than or equal to N.
  • the first terminal device receives the DMRS of the first PDCCH through the L DMRS antenna ports.
  • different frequency domain orthogonal mask codes OCC and/or different time domain OCC are associated between any two of the N DMRS antenna ports, so that any two of the above DMRS antenna ports are orthogonal to each other.
  • the N DMRS antenna ports belong to at least two CDM groups, and each of the at least two CDM groups includes a portion of the N DMRS antenna ports.
  • the number of DMRS antenna ports included in different CDM groups in the at least two CDM groups may be the same or different.
  • Different frequency domain OCCs and/or different time domain OCCs are associated between any two DMRS antenna ports in any one of the at least two CDM groups, so that any two DMRS antenna ports in each CDM group are orthogonal to each other.
  • Different frequency domain resources are associated between any two CDM groups of the at least two CDM groups, so that different CDM groups Any two DMRS antenna ports are orthogonal to each other.
  • the transmission resources of the first PDCCH include multiple resource element groups REGs, each of the multiple REGs includes M first resource elements RE, and the M first REGs are used to carry DMRS of the PDCCH, where M is a positive integer greater than 3.
  • Each of the multiple REGs includes one orthogonal frequency division multiplexing OFDM symbol in the time domain and one resource block RB in the frequency domain.
  • the time domain resources of the first PDCCH include K symbols, and the K symbols include a first symbol and a second symbol.
  • K is a positive integer greater than or equal to 2.
  • the first PDCCH includes data information of the first PDCCH and a DMRS of the first PDCCH.
  • the data information of the first PDCCH occupies the first symbol, and the DMRS of the first PDCCH occupies the second symbol.
  • the length of the frequency domain OCC is 2 or 4
  • the length of the time domain OCC is 2 or 4.
  • the value of N includes 2T or 3*Q, where T and Q are positive integers.
  • N includes one of the following: 2, 3, 4, 6, 8, 12, or 16.
  • the method further includes: the first terminal device receives first information.
  • the first information indicates the L antenna ports.
  • the first information is carried in one of the following: radio resource control RRC signaling, system broadcast information block SIB, downlink control information DCI, or media access control layer control element MAC CE.
  • the first information indicates the L antenna ports, including: the first information indicates that the first terminal device uses the L DMRS antenna ports on the first search space set SS set to detect the first PDCCH.
  • the first SS set is all SS sets associated with all control resource sets CORESET of the first terminal device.
  • the first SS set is all SS sets associated with all CORESETs on the first bandwidth part BWP
  • the first BWP is one BWP among all BWPs of the first terminal device.
  • the first SS set is all SS sets associated with the first CORESET
  • the first CORESET is one CORESET among all CORESETs of the first terminal device.
  • the first SS set is one SS set among all SS sets of the first terminal device.
  • the first information indicates the L antenna ports, including: the first information indicates that the first terminal device uses the L DMRS antenna ports to detect the first PDCCH on all SS sets associated with the first CORESET group, and the first CORESET group is one CORESET group among all CORESET groups of the first terminal device.
  • the first information indicates the L antenna ports, including: the first information indicates that the first terminal device uses the L DMRS antenna ports on a first SS set group to detect the first PDCCH, and the first SS set group is one SS set group among all SS set groups of the first terminal device.
  • the DCI corresponds to a first terminal device group, and the first terminal device group includes at least one terminal device.
  • the first information is carried in a first information block of the DCI, and the first information block corresponds to one or more terminal devices in the first terminal device group, and the one or more terminal devices include the first terminal device.
  • the L DMRS antenna ports are determined based on a radio network temporary identifier RNTI of the first terminal device.
  • n RNTI represents the value of the RNTI.
  • the L DMRS antenna ports are determined based on the radio network temporary identifier RNTI of the first terminal device and the number of the first time unit.
  • L 1.
  • n RNTI represents the value of the RNTI.
  • a and D are positive integers.
  • the L DMRS antenna ports are determined based on the radio network temporary identifier RNTI of the first terminal device, the number of the first time unit, and the number of the first CORESET.
  • L 1.
  • n RNTI represents the value of the RNTI.
  • p represents the number of the first CORESET
  • D is a positive integer
  • Ap is a positive integer determined according to p.
  • the technical effects brought about by the second aspect or any design method in the second aspect can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here.
  • a communication device for implementing the above-mentioned various methods.
  • the communication device includes a module, unit, or means corresponding to the implementation method, and the module, unit, or means can be implemented by hardware, software, or by hardware executing the corresponding software implementation.
  • the hardware or software includes one or more modules or units corresponding to the functions.
  • the communication device may include a processing module and a transceiver module.
  • the processing module may be used to implement the processing function in any of the above aspects and any possible implementations thereof.
  • the transceiver module which may also be referred to as a transceiver unit, is used to implement the sending and/or receiving functions in any of the above aspects and any possible implementations thereof.
  • the transceiver module may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module includes a sending module and/or a receiving module, which are respectively used to implement the sending or receiving functions in any of the above aspects and any possible implementation methods thereof.
  • a communication device comprising: a processor and a memory, wherein the processor and the memory are coupled, and the memory stores program instructions, and when the program instructions stored in the memory are executed by the processor, the communication device executes a method as in any one of the above aspects or any possible design of any one of the aspects.
  • a communication device comprising: a processor; the processor is used to execute a computer program or instruction so that the communication device executes the method described in any aspect or the method in any possible design of any aspect.
  • the communication device also includes a memory, which can be coupled to the processor, or the memory can also exist independently of the processor, for example, the memory and the processor are two independent modules.
  • the memory can be located outside the communication device or inside the communication device.
  • a computer-readable storage medium stores a computer program or instruction, and when the computer program or instruction is executed, the method described in any one of the above aspects or any possible design of any one of the above aspects is executed.
  • a computer program product comprising instructions, which, when executed, enables the method described in any of the above aspects or the method in any possible design of any aspect to be executed.
  • the communication device provided in any one of the third to seventh aspects may be the network device in the first aspect, or a component included in the network device, such as a chip or a chip system; or, the communication device may be the first terminal device in the second aspect, or a component included in the first terminal device, such as a chip or a chip system.
  • the device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices.
  • the communication device provided in any one of the third to seventh aspects is a chip
  • the sending action/function of the communication device can be understood as output information
  • the receiving action/function of the communication device can be understood as input information
  • a communication device for implementing the method described in any one of the above aspects or any possible design of any one of the above aspects.
  • the communication device includes a terminal device, a network device, a chip system or a chip, wherein the terminal device can be referred to as a first terminal device.
  • the technical effects brought about by any design method in the third aspect to the eighth aspect can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here.
  • FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application.
  • FIG2 is a schematic diagram of a control resource set configuration provided in an embodiment of the present application.
  • FIG3a is a schematic diagram of time-frequency resource distribution of a PDCCH provided in an embodiment of the present application.
  • FIG3b is a schematic diagram of time-frequency resource distribution of a control resource set provided in an embodiment of the present application.
  • FIG3c is a schematic diagram of time-frequency resource distribution of another control resource set provided in an embodiment of the present application.
  • FIG4 is a schematic diagram of a position distribution of a demodulation reference signal provided in an embodiment of the present application.
  • FIG5 is a flow chart of a communication method provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of the position distribution of another demodulation reference signal provided in an embodiment of the present application.
  • FIG7 is a schematic diagram of distribution of an orthogonal mask provided in an embodiment of the present application.
  • FIG8 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG9 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG10 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG11 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG12 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG13 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG14 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG15 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG16 is a schematic diagram of distribution of another orthogonal mask provided in an embodiment of the present application.
  • FIG17 is a flow chart of another communication method provided in an embodiment of the present application.
  • FIG18 is a schematic diagram of information block distribution provided in an embodiment of the present application.
  • FIG19 is a flow chart of another communication method provided in an embodiment of the present application.
  • FIG20 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.
  • FIG21 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • FIG22 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • system may be used interchangeably with “network”.
  • network may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and/or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. In addition, combinations of these schemes may also be used.
  • the network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application.
  • a person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
  • FIG. 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application.
  • the communication system 1000 includes at least one network device (such as 110a and 110b in FIG. 1 ) and at least one terminal device (such as 120a-120j in FIG. 1 ).
  • the terminal device can communicate with the network device wirelessly.
  • different network devices can communicate with each other.
  • different terminal devices can communicate with each other.
  • Figure 1 is only a schematic diagram.
  • the communication system 1000 may also include other network devices.
  • the communication system 1000 may also include one or more core network (CN) devices, wireless relay devices and wireless backhaul devices, which are not specifically limited here.
  • CN core network
  • the network device may be connected to the core network device wirelessly or wiredly.
  • the core network device and the network device may be independent and different physical devices, or the functions of the core network device and the logical functions of the network device may be integrated on the same physical device, or the functions of some core network devices and some network devices may be integrated on one physical device, which is not specifically limited in the embodiments of the present application.
  • the network device is a network-side device with wireless transceiver functions.
  • the network device may be a device in a radio access network (RAN) that provides wireless communication functions for terminal devices, referred to as a RAN device.
  • RAN may be an access network in the third generation partnership project (3GPP), for example, 4G, 5G, or a future-oriented 6G network.
  • 3GPP third generation partnership project
  • RAN may also be an open access network (open RAN, O-RAN or ORAN), a cloud radio access network (cloud radio access network, CRAN), or a communication network of two or more of the above networks.
  • RAN equipment may be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation base station (next generation nodeB, gNB) in a fifth generation (5th generation, 5G) mobile communication system, a next generation base station in a sixth generation (6th generation, 6G) mobile communication system, a base station in a future mobile communication system, a wireless fidelity (WiFi) system, a long range radio (LoRa) system, or an access node in a vehicle networking system.
  • RAN equipment can also be a module or unit that completes some functions of the base station, for example, it can be a centralized unit (CU), a distributed unit (DU), or a radio unit (RU).
  • the CU here completes the functions of the radio resource control protocol and packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the base station.
  • the functions of the radio link control layer and the medium access control (MAC) layer can also complete part of the physical layer or all of the physical layer.
  • 3GPP third generation partnership project
  • CU and DU can be set separately, or they can also be included in the same network element, such as a baseband unit (BBU).
  • BBU baseband unit
  • RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU) or a remote radio head (RRH).
  • RRU remote radio unit
  • AAU active antenna unit
  • RRH remote radio head
  • CU, DU or RU may also have different names, but those skilled in the art can understand their meanings.
  • CU can also be called O-CU (open CU)
  • DU can also be called O-DU
  • RU can also be called O-RU.
  • Any unit in the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.
  • the wireless access network device may be a macro base station (such as 110a in FIG. 1 ), a micro base station or an indoor station (such as 110b in FIG. 1 ), a relay node or a donor node, etc.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device.
  • network device is used as the abbreviation of wireless access network device
  • base station is used as an example of wireless access network device.
  • the terminal device accesses the core network through a network device.
  • the terminal device includes a device that provides voice and/or data connectivity to the user, specifically, a device that provides voice to the user, or a device that provides data connectivity to the user, or a device that provides voice and data connectivity to the user.
  • a device that provides voice and data connectivity to the user may include a handheld device with a wireless connection function, or a processing device connected to a wireless modem.
  • the terminal device can communicate with the core network via a wireless access network, exchange voice or data with the RAN, or exchange voice and data with the RAN.
  • the terminal device may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, D2D terminal equipment, V2X terminal equipment, machine-to-machine/machine-type communications (M2M/MTC) terminal equipment, Internet of Things (IoT) terminal equipment, subscriber unit, subscriber station, mobile station, remote station, access point (AP), remote terminal, access terminal, user terminal, user agent, or user device, etc.
  • UE user equipment
  • M2M/MTC machine-to-machine/machine-type communications
  • IoT Internet of Things
  • subscriber unit subscriber station
  • mobile station mobile station
  • remote station access point
  • remote terminal access terminal
  • user terminal user agent
  • it may include a mobile phone (or "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, or computer-built-in mobile device, etc.
  • PCS personal communication service
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • restricted devices such as devices with low power consumption, or devices with limited storage capacity, or devices with limited computing power, etc.
  • information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning systems (GPS), laser scanners, etc.
  • Vehicle-mounted terminal devices are also called on-board units (OBU).
  • OBU on-board units
  • the terminal device may also include a relay.
  • a relay any device that can communicate data with the base station.
  • the device for realizing the function of the terminal device may be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system, which may be installed in the terminal device.
  • the chip system may be composed of a chip, or may include a chip and other discrete devices.
  • the device for realizing the function of the terminal is a terminal device as an example for introduction.
  • the network equipment and terminal equipment can be fixed or movable.
  • the network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons and artificial satellites in the air.
  • the embodiments of the present application do not limit the application scenarios of the network equipment and terminal equipment.
  • the helicopter or drone 120i in Figure 1 can be configured as a mobile base station.
  • the terminal device 120i is a network device; but for the network device 110a, 120i is a terminal device, that is, 110a and 120i communicate through the wireless air interface protocol.
  • 110a and 120i can also communicate through the interface protocol between base stations.
  • relative to 110a, 120i is also a network device. Therefore, network devices and terminal devices can be collectively referred to as communication devices.
  • 110a and 110b in Figure 1 can be referred to as communication devices with network device functions
  • 120a-120j in Figure 1 can be referred to as communication devices with terminal device functions.
  • Network devices and terminal devices, network devices and network devices, and terminal devices and terminal devices can communicate through licensed spectrum, unlicensed spectrum, or both; they can communicate through spectrum below 6 gigahertz (GHz) or above 6 GHz. It is also possible to use spectrum below 6 GHz and spectrum above 6 GHz for communication at the same time.
  • the embodiments of the present application do not limit the spectrum resources used for wireless communication.
  • the functions of the network device may also be performed by a module (such as a chip) in the network device, or by a control subsystem including the network device function.
  • the control subsystem including the network device function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city.
  • the functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device including the terminal device function.
  • a network device sends a downlink signal or downlink information to a terminal device, and the downlink information is carried on a downlink channel; the terminal device sends an uplink signal or uplink information to the network device, and the uplink information is carried on an uplink channel.
  • the terminal device needs to establish a wireless connection with the cell controlled by the network device.
  • the cell with which the terminal device has established a wireless connection is called the service cell of the terminal device.
  • the NR communication system defines PDCCH to transmit downlink control information (DCI).
  • DCI downlink control information
  • the terminal device can blindly detect candidate PDCCHs from a network device (such as a base station) in one or more search space sets (search space sets, SS sets).
  • a network device such as a base station
  • search space sets search space sets, SS sets
  • SS set can indicate the starting symbol and period of PDCCH in the time domain.
  • SS set can be understood as the set of candidate PDCCHs that the terminal device needs to detect.
  • SS set is divided into common search space set (CSS set) and user search space set (USS set).
  • CORESET can indicate the frequency band occupied by PDCCH in frequency domain and the number of symbols occupied by PDCCH in time domain.
  • CORESET can be understood as the time-frequency resources used by terminal device when using one or more SS sets to detect candidate PDCCH.
  • a CORESET consists of resource blocks (RBs), continuous in time domain CORESET can appear at any time-frequency position in the bandwidth part (BWP) and is semi-statically configured by the network device side through high-level signaling.
  • BWP bandwidth part
  • Each terminal device can be configured with one or more CORESETs, as shown in Figure 2.
  • the time-frequency resources used by a PDCCH are composed of one or more control channel elements (CCE) in a CORESET, as shown in Figure 3a.
  • CCE can also be called aggregation level (AL).
  • a CCE consists of 6 resource element groups (REGs), each of which occupies one symbol in the time domain and one RB in the frequency domain.
  • One RB includes 12 subcarriers in the frequency domain.
  • each REG includes 12 resource elements (REs).
  • Non-interleaved mapping is shown in Figure 3b
  • interleaved mapping is shown in Figure 3c.
  • a symbol may refer to an orthogonal frequency division multiplexing (OFDM) symbol, which is the smallest time unit in the time domain in an OFDM system.
  • OFDM orthogonal frequency division multiplexing
  • DMRS PDCCH demodulation reference signal
  • the NR communication system introduces a PDCCH-specific DMRS, which can be described as: PDCCH DMRS, or PDCCH DMRS.
  • PDCCH DMRS a PDCCH-specific DMRS
  • the introduction of PDCCH DMRS enables network devices to transmit PDCCH using beamforming, thereby improving the coverage and performance of PDCCH.
  • the DMRS of the PDCCH is sent using a pseudo-random sequence.
  • the DMRS of the PDCCH is mapped to some subcarriers of the REG, such as the fourth subcarrier of every four subcarriers, as shown in Figure 4. Therefore, the overhead of the DMRS of the PDCCH is 1/4, that is, each REG has 3 REs for DMRS transmission.
  • the RE used to carry DMRS can be referred to as DMRS RE.
  • the data information of PDCCH can be understood as the DCI carried by PDCCH, which can be recorded as: PDCCH Data.
  • a certain PDCCH includes two parts, namely, data information of the PDCCH and DMRS of the PDCCH.
  • An antenna port is a logical port used for signal transmission.
  • An antenna port can correspond to one or more physical antennas. Different antenna ports can correspond to the same physical antenna or different physical antennas. From the perspective of the receiver, each antenna port corresponds to an independent wireless channel.
  • an antenna port is defined as an antenna port used to transmit a reference signal, which can be referred to as a reference signal antenna port.
  • an antenna port used to transmit DMRS can be referred to as a DMRS antenna port (DMRS port).
  • antenna ports refer to DMRS antenna ports.
  • an antenna port is also referred to as a port for short.
  • a DMRS antenna port may also be referred to as a DMRS port for short.
  • PDCCH only supports a single antenna port, and the port number is 2000.
  • the DMRS of PDCCH also only supports one antenna port, that is, a single DMRS antenna port.
  • the network device processes them in a transparent manner to the terminal device, that is, the same DMRS antenna port is used to transmit the PDCCHs of multiple terminal devices.
  • the network device uses the same DMRS antenna port to transmit the PDCCHs of multiple terminal devices on the same time-frequency resources.
  • the DMRSs of multiple PDCCHs may not be orthogonal, resulting in poor demodulation performance of the PDCCH.
  • the problem of limited PDCCH capacity may occur, affecting the PDCCH performance.
  • PDCCH only supports a single antenna port.
  • multiple PDCCHs are transmitted using MU-MIMO, since the DMRS of multiple PDCCHs are transmitted using the same antenna port, they may not be orthogonal to each other, which limits the PDCCH demodulation performance and affects the PDCCH capacity.
  • the present application provides a communication method, which can be applied to the system shown in Figure 1.
  • the method includes: a network device determines L DMRS antenna ports from N DMRS antenna ports.
  • the N DMRS antenna ports are used for PDCCH transmission, and any two DMRS antenna ports among the N DMRS antenna ports are orthogonally multiplexed through at least one of the following: time division multiplexing (time division multiplexing, TDM), frequency division multiplexing (frequency division multiplexing, FDM), or code division multiplexing (code division multiplexing, CDM).
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • N is a positive integer greater than or equal to 2
  • L is a positive integer less than or equal to N.
  • the network device sends the DMRS of the first PDCCH through the L DMRS antenna ports.
  • TDM between any two DMRS antenna ports means that different DMRS antenna ports are associated with or use different time domain resources.
  • PDCCH DMRS transmitted on different DMRS antenna ports can use different time domain resources, thereby ensuring that DMRS of different PDCCHs are orthogonal to each other.
  • FDM between any two DMRS antenna ports means that different DMRS antenna ports are associated with or use different frequency domain resources.
  • PDCCH DMRS transmitted on different DMRS antenna ports can use different frequency domain resources, thereby ensuring that DMRS of different PDCCHs are orthogonal to each other.
  • CDM between any two DMRS antenna ports means that different DMRS antenna ports are associated or use different orthogonal codes (such as orthogonal masks described below).
  • PDCCH DMRS transmitted on different DMRS antenna ports can use different orthogonal codes, thereby ensuring that DMRS of different PDCCHs are orthogonal to each other.
  • the DMRS of different PDCCHs are orthogonal to each other.
  • the DMRS of the first PDCCH is orthogonal to the DMRS of other PDCCHs, which helps to improve the PDCCH demodulation performance and PDCCH capacity.
  • the communication method 500 proposed in the embodiment of the present application includes the following operations:
  • S501 A network device determines L DMRS antenna ports from N DMRS antenna ports.
  • the network devices are introduced as follows:
  • This step can be performed by a network device.
  • the "network device” in this application can refer to the network device itself, or a component in the network device (for example, a processor, chip, or chip system, etc.), or it can also be a logic module or software that can implement all or part of the functions of the network device.
  • the L DMRS antenna ports are introduced as follows:
  • L is a positive integer less than or equal to N, that is, the L DMRS antenna ports are one or more DMRS antenna ports among the N DMRS antenna ports.
  • N DMRS antenna ports N DMRS antenna ports
  • N is a positive integer greater than or equal to 2, that is, the N DMRS antenna ports are two or more DMRS antenna ports.
  • N DMRS antenna ports are used for PDCCH transmission, which can be recorded as PDCCH DMRS antenna ports.
  • PDCCH supports multiple antenna ports.
  • any two of the N DMRS antenna ports are orthogonally multiplexed by at least one of the following: TDM, FDM, or CDM.
  • any two DMRS antenna ports among the N DMRS antenna ports are orthogonally multiplexed through CDM.
  • any two DMRS antenna ports among the N DMRS antenna ports are orthogonally multiplexed through CDM and FDM.
  • FDM is performed between the data information of the PDCCH and the DMRS of the PDCCH.
  • the transmission resources of the first PDCCH include multiple REGs, each of the multiple REGs includes M first REs, and the M first REs are used to carry the DMRS of the PDCCH, where M is a positive integer greater than 3.
  • Each of the multiple REGs includes 1 OFDM symbol in the time domain and 1 RB in the frequency domain, as described in the glossary for details.
  • each REG includes multiple REs (such as 12 REs), among which the RE used to carry the PDCCH DMRS is described as: the first RE.
  • the RE used to carry the PDCCH DMRS is described as: the first RE.
  • other REs may also be included, such as REs carrying data information of the PDCCH.
  • the DMRS antenna port uses an orthogonal cover code (OCC) in the frequency domain, and the length of the OCC is generally an even number
  • the number of REs used to carry DMRS in a REG is an even number
  • the 4 first REs in each REG are used to carry the DMRS of the PDCCH.
  • FIG6 shows the data information and DMRS distribution of PDCCH on a REG.
  • REs used to carry data information are shown as blank squares.
  • REs used to carry DMRS are shown as squares filled with diagonal lines.
  • the DMRS of the PDCCH is sent using a pseudo-random sequence, and an orthogonal sequence can be superimposed on the pseudo-random sequence to support multiple orthogonal DMRS antenna ports.
  • the pseudo-random sequence can be called a base sequence, and the orthogonal sequence is called an OCC.
  • OCC can also have other descriptions, such as an OCC sequence, which is not limited in this application.
  • OCC includes time domain OCC and frequency domain OCC.
  • Time domain OCC can be understood as: using OCC in the time domain dimension, which can be recorded as TD-OCC, that is, time domain-OCC.
  • Frequency domain OCC can be understood as: using OCC in the frequency domain dimension, which can be recorded as FD-OCC, that is, frequency domain-OCC.
  • OCC length of OCC
  • the OCC has two elements.
  • the OCC with a length of 2 can be a sequence including the sequence in Table 1:
  • the OCC has four elements.
  • the OCC with a length of 4 can be a sequence including the sequence in Table 2:
  • a time domain OCC with a length of 2 can be recorded as: 2 long TD-OCC.
  • a time domain OCC with a length of 4 can be recorded as: 4 long TD-OCC.
  • a frequency domain OCC with a length of 2 can be recorded as: 2 long FD-OCC.
  • a frequency domain OCC with a length of 4 can be recorded as: 4 long FD-OCC.
  • any two of the N DMRS antenna ports are orthogonally multiplexed through CDM.
  • any two of the N DMRS antenna ports are associated with (or use) different frequency domain OCCs and/or different time domain OCCs.
  • the N DMRS antenna ports are associated with (or use) the same time-frequency resources, and orthogonality is maintained by associating (or using) different time domain OCCs and/or different frequency domain OCCs.
  • any two of the N DMRS antenna ports are associated with (or use) different frequency domain OCCs.
  • the length of the associated (or used) frequency domain OCCs there may be the following examples (ie, the following examples 1-2):
  • the first two DMRS REs and the last two DMRS REs are associated with the same OCC of length 2.
  • each small square in FIG7 represents an RE.
  • the N DMRS antenna ports are respectively recorded as DMRS antenna port 0 and DMRS antenna port 1.
  • DMRS antenna port 0 and DMRS antenna port 1 are associated with different frequency domain OCCs to maintain orthogonality.
  • Fig. 7 the box where the letter a is located shows the frequency domain OCC associated with the DMRS antenna port 0.
  • the frequency domain OCC associated with the DMRS antenna port 0 is [+1, +1].
  • Fig. 7 the box where the letter b is located shows the frequency domain OCC associated with DMRS antenna port 1.
  • the frequency domain OCC associated with DMRS antenna port 1 is [+1, -1].
  • the four DMRS antenna ports are respectively recorded as: DMRS antenna port 0-DMRS antenna port 3.
  • the four DMRS antenna ports are associated with different frequency domain OCCs to maintain orthogonality.
  • the frequency domain OCC associated with DMRS antenna port 0 is [+1, +1, +1, +1].
  • the frequency domain OCC associated with DMRS antenna port 1 is [+1, -1, +1, -1].
  • the frequency domain OCC associated with DMRS antenna port 2 is [+1, +1, -1, -1].
  • the frequency domain OCC associated with DMRS antenna port 3 is [+1, -1, -1, +1].
  • the above frequency domain OCC can also be replaced by: time domain OCC.
  • the above frequency domain OCC can also be replaced by: time domain OCC.
  • any two DMRS antenna ports among the N DMRS antenna ports are orthogonally multiplexed through different frequency domain OCCs and time domain OCCs.
  • the following implementation methods ie, the following examples 3-6 may be used:
  • Example 3 frequency domain OCC with correlation length 2, and time domain OCC with length 2:
  • Each of the N DMRS antenna ports is associated with a time domain OCC of length 2 and a frequency domain OCC of length 2 for weighted processing.
  • the time domain symbol of the PDCCH is 2
  • the time domain OCC and frequency domain OCC associated with different DMRS antenna ports are shown in FIG9.
  • the time domain OCC and frequency domain OCC associated with different DMRS antenna ports are shown in FIG10.
  • the four DMRS antenna ports are respectively recorded as DMRS antenna port 0 to DMRS antenna port 3.
  • the frequency domain OCC with a length of 2 and the time domain OCC with a length of 2 associated with the four DMRS antenna ports remain orthogonal.
  • the time domain OCC associated with DMRS antenna port 0 is [+1, +1], and the frequency domain OCC associated with DMRS antenna port 0 is [+1, +1].
  • the time domain OCC associated with DMRS antenna port 1 is [+1, -1], and the frequency domain OCC associated with DMRS antenna port 0 is [+1, +1].
  • the time domain OCC associated with DMRS antenna port 2 is [+1, +1], and the frequency domain OCC associated with DMRS antenna port 2 is [+1, -1].
  • the time domain OCC associated with DMRS antenna port 3 is [+1, -1], and the frequency domain OCC associated with DMRS antenna port 3 is [+1, -1].
  • Example 4 frequency domain OCC with correlation length of 4, and time domain OCC with length of 2:
  • Each of the N DMRS antenna ports is associated with a time domain OCC of length 2 and a frequency domain OCC of length 4 for weighted processing.
  • the time domain symbol of the PDCCH is 2
  • the time domain OCC and frequency domain OCC associated with different DMRS antenna ports are shown in FIG11.
  • the time domain symbol of the PDCCH is 4, the time domain OCC and frequency domain OCC associated with different DMRS antenna ports are shown in FIG12.
  • the eight DMRS antenna ports are respectively recorded as DMRS antenna port 0 to DMRS antenna port 7.
  • the frequency domain OCC with an associated length of 4 and the time domain OCC with a length of 2 of the eight DMRS antenna ports are kept orthogonal.
  • the time domain OCC associated with DMRS antenna port 0 is [+1, +1]
  • the frequency domain OCC associated with DMRS antenna port 0 is [+1, +1, +1, +1].
  • the time domain OCC associated with DMRS antenna port 1 is [+1, -1]
  • the frequency domain OCC associated with DMRS antenna port 1 is [+1, +1, +1, +1].
  • the time domain OCC associated with DMRS antenna port 2 is [+1, +1]
  • the frequency domain OCC associated with DMRS antenna port 2 is [+1, -1, +1, -1].
  • the time domain OCC associated with DMRS antenna port 3 is [+1, -1], and the frequency domain OCC associated with DMRS antenna port 3 is [+1, -1, +1, -1].
  • the time domain OCC associated with DMRS antenna port 4 is [+1, +1], and the frequency domain OCC associated with DMRS antenna port 4 is [+1, +1, -1, -1].
  • the time domain OCC associated with DMRS antenna port 5 is [+1, -1], and the frequency domain OCC associated with DMRS antenna port 5 is [+1, +1, -1, -1].
  • the time domain OCC associated with DMRS antenna port 6 is [+1, +1], and the frequency domain OCC associated with DMRS antenna port 6 is [+1, -1, -1, +1].
  • the time domain OCC associated with DMRS antenna port 7 is [+1, -1], and the frequency domain OCC associated with DMRS antenna port 7 is [+1, -1, -1, +1].
  • Each of the N DMRS antenna ports is associated with a frequency domain OCC of length 2 and a time domain OCC of length 4 for weighted processing.
  • the frequency domain OCC and time domain OCC associated with different DMRS antenna ports are shown in FIG13.
  • the eight DMRS antenna ports are respectively recorded as DMRS antenna port 0 to DMRS antenna port 7.
  • the time domain OCC with an associated length of 4 and the frequency domain OCC with a length of 2 of the eight DMRS antenna ports are kept orthogonal.
  • the frequency domain OCC associated with DMRS antenna port 0 is [+1, +1]
  • the time domain OCC associated with DMRS antenna port 0 is [+1, +1, +1, +1].
  • the frequency domain OCC associated with DMRS antenna port 1 is [+1, -1]
  • the time domain OCC associated with DMRS antenna port 1 is [+1, +1, +1, +1].
  • the frequency domain OCC associated with DMRS antenna port 2 is [+1, +1]
  • the time domain OCC associated with DMRS antenna port 2 is [+1, -1, +1, -1].
  • the frequency domain OCC associated with DMRS antenna port 3 is [+1, -1], and the time domain OCC associated with DMRS antenna port 3 is [+1, -1, +1, -1].
  • the frequency domain OCC associated with DMRS antenna port 4 is [+1, +1], and the time domain OCC associated with DMRS antenna port 4 is [+1, +1, -1, -1].
  • the frequency domain OCC associated with DMRS antenna port 5 is [+1, -1], and the time domain OCC associated with DMRS antenna port 5 is [+1, +1, -1, -1].
  • the frequency domain OCC associated with DMRS antenna port 6 is [+1, +1], and the time domain OCC associated with DMRS antenna port 6 is [+1, -1, -1, +1].
  • the frequency domain OCC associated with DMRS antenna port 7 is [+1, -1], and the time domain OCC associated with DMRS antenna port 7 is [+1, -1, -1, +1].
  • Each of the N DMRS antenna ports is associated with a frequency domain OCC of length 4 and a time domain OCC of length 4 for weighted processing.
  • the frequency domain OCC and time domain OCC associated with different DMRS antenna ports are shown in FIG14.
  • the 16 DMRS antenna ports are respectively recorded as DMRS antenna port 0 to DMRS antenna port 15.
  • the time domain OCC with a length of 4 and the frequency domain OCC with a length of 4 associated with the 16 DMRS antenna ports remain orthogonal.
  • any two of the N DMRS antenna ports are orthogonally multiplexed through CDM and/or FDM.
  • the N DMRS antenna ports belong to at least two CDM groups, and each of the at least two CDM groups includes a portion of the N DMRS antenna ports.
  • Any two DMRS antenna ports in any one of the at least two CDM groups are associated with different frequency domain OCCs and/or different time domain OCCs.
  • the DMRS antenna ports included in any two CDM groups in the at least two CDM groups are associated with different frequency domain resources.
  • DMRS antenna ports that occupy the same time-frequency resources and are associated with time-domain OCC and/or frequency-domain OCC to maintain orthogonality belong to one CDM group
  • DMRS antenna ports that occupy different time-frequency resources belong to different CDM groups.
  • the number of DMRS antenna ports included in the groups may be the same or different.
  • the same number of DMRS antenna ports included in different CDM groups is taken as an example for description, which should not be construed as a limitation on the present application.
  • each CDM group includes 2 DMRS REs, as shown in the boxes ‘a1’ and ‘b1’ in Figure 15.
  • each CDM group can be associated with a frequency domain OCC of length 2, as shown in the boxes where ‘a2’ and ‘b2’ are located in Figure 15.
  • each CDM group can be associated with a time domain OCC of length 2, as shown in the box where ‘a3’ and ‘b3’ are located in Figure 15.
  • each CDM group can be associated with a time domain OCC of length 2 and a frequency domain OCC of length 2, as shown in the box where ‘a4’ and ‘b4’ are located in Figure 15.
  • N 8.
  • the data information of the PDCCH and the DMRS of the PDCCH are TDM-connected.
  • the time domain resources of the PDCCH include K symbols, and the K symbols include a first symbol and a second symbol.
  • the data information of the PDCCH occupies the first symbol, and the DMRS of the PDCCH occupies the second symbol.
  • K is a positive integer greater than or equal to 2.
  • the data information of the PDCCH occupies the first symbol, as shown by the blank squares.
  • the DMRS of the PDCCH occupies the second symbol, as shown by the filled squares.
  • the DMRS of the PDCCH can also occupy more symbols, such as 2 symbols, 4 symbols, etc., which is not limited in this application.
  • any two of the N DMRS antenna ports are orthogonally multiplexed through CDM.
  • any two of the N DMRS antenna ports are associated with or use different frequency domain OCCs and/or different time domain OCCs.
  • the N DMRS antenna ports occupy the same time-frequency resources and maintain orthogonality by associating different time domain OCCs and/or different frequency domain OCCs.
  • any two of the N DMRS antenna ports are associated with or use different frequency domain OCCs.
  • the length of the associated frequency domain OCC there may be the following examples:
  • any two DMRS antenna ports among the N DMRS antenna ports are associated with or use different time domain OCCs.
  • the length of the associated time domain OCC there may be the following examples:
  • each DMRS antenna port can be associated with a time domain OCC of length 2.
  • each DMRS antenna port can be associated with a time domain OCC of length 4.
  • the DMRS antenna ports in each CDM group can include 4 REs respectively, and it is considered to maintain the orthogonality between different DMRS antenna ports in the same CDM group by associating different frequency domain OCCs.
  • the DMRS antenna ports in each CDM group can include 4 REs respectively.
  • the frequency domain OCC maintains orthogonality between different DMRS antenna ports of the same CDM group.
  • the DMRS antenna ports in each CDM group can include 6 REs respectively.
  • each DMRS antenna port can be associated with a time domain OCC of length 2 and a frequency domain OCC of length 2.
  • N 8.
  • any two of the N DMRS antenna ports are orthogonally multiplexed by FDM.
  • any two of the N DMRS antenna ports are associated with or use different frequency domain resources.
  • N 3, DMRS antenna port 0 occupies 4 REs, such as the 1st/2nd/7th/8th RE of each REG.
  • DMRS antenna port 1 occupies 4 REs, such as the 3rd/4th/9th/10th RE of each REG.
  • DMRS antenna port 2 occupies 4 REs, such as the 5th/6th/11th/12th RE of each REG.
  • N may have other values, for example, the value of N includes 2 T or 3*Q, where T and Q are positive integers.
  • the network device After determining L DMRS antenna ports, the network device executes S502:
  • the network device sends a first PDCCH to the first terminal device through L DMRS antenna ports.
  • the first terminal device receives the first PDCCH from the network device through the L DMRS antenna ports.
  • the introduction of the first terminal device is as follows:
  • the "first terminal device” in this application can refer to the first terminal device itself, or a component in the first terminal device (for example, a processor, a chip, or a chip system, etc.), or it can also be a logic module or software that can implement all or part of the functions of the first terminal device.
  • the L DMRS antenna ports can be found in the introduction of S501 and will not be described in detail.
  • the introduction of the first PDCCH is as follows:
  • the first PDCCH includes two parts, namely, data information of the first PDCCH and a DMRS of the first PDCCH.
  • the network device sends the DMRS of the first PDCCH to the first terminal device through L DMRS antenna ports, including: the network device sends the DMRS of the first PDCCH to the first terminal device through at least one of the time domain resources, frequency domain resources, or OCC associated with the L DMRS antenna ports, and the L DMRS antenna ports.
  • the network device For the data information of the first PDCCH, the network device sends the data information of the first PDCCH to the first terminal device through L DMRS antenna ports, which only means: the network device sends the data information of the first PDCCH to the first terminal device through the L antenna ports that send the DMRS of the first PDCCH, instead of using any one of the time domain resources, frequency domain resources and OCC associated with the L DMRS antenna ports to send the data information of the first PDCCH to the first terminal device.
  • the PDCCH involved in the above two implementations ie, the first implementation and the second implementation
  • the PDCCH involved in the above two implementations can be replaced by: the first PDCCH.
  • the first terminal device determines L DMRS antenna ports.
  • the L DMRS antenna ports can be found in the introduction of S501 and will not be described in detail.
  • S503 is introduced in combination with two implementation schemes (the first implementation scheme and the second implementation scheme described below):
  • the communication method of this application comprises the following steps:
  • S503a The network device sends first information to the first terminal device.
  • the first terminal device receives the first information from the network device.
  • the first information is introduced as follows:
  • the first information indicates the L DMRS antenna ports, such as the first information includes the port numbers of the L DMRS antenna ports.
  • the first information indicates the DMRS antenna port at the terminal device granularity, that is, the first information indicates that the first terminal device uses L DMRS antenna ports on the first SS set to detect the first PDCCH.
  • the first SS set is all SS sets associated with all CORESETs of the first terminal device.
  • the device uses the L DMRS antenna ports to monitor the PDCCH on any SS set associated with any CORESET configured by the device.
  • the first information indicates the DMRS antenna port with a BWP granularity, that is, the first information indicates that the first terminal device uses L DMRS antenna ports on the second SS set to detect the first PDCCH.
  • the second SS set is all SS sets associated with all CORESETs on the first BWP, and the first BWP is one of all BWPs of the first terminal device.
  • all PDCCH transmissions of the first terminal device on the same BWP use the above L DMRS antenna ports
  • the DMRS antenna ports used for PDCCH transmissions on different BWPs are independently configured, which can be the same or different.
  • the first terminal device uses the above L DMRS antenna ports to monitor PDCCH on all SS set(s) associated with all CORESET(s) associated with the first BWP.
  • the first information indicates the DMRS antenna port at a CORESET granularity, that is, the first information indicates that the first terminal device uses L DMRS antenna ports on a third SS set to detect the first PDCCH.
  • the third SS set is all SS sets associated with the first CORESET, and the first CORESET is one CORESET among all CORESETs of the first terminal device.
  • all PDCCH transmissions performed by the first terminal device using the same CORESET use the above L DMRS antenna ports
  • the DMRS antenna ports used for PDCCH transmissions performed on different CORESETs are independently configured and can be the same or different.
  • the first terminal device uses the above L DMRS antenna ports to monitor PDCCH on all SS set(s) associated with the first CORESET.
  • the first information indicates the DMRS antenna port at a CORESET group granularity, that is, the first information indicates that the first terminal device uses L DMRS antenna ports on the fourth SS set to detect the first PDCCH.
  • the fourth SS set is all SS sets associated with the first CORESET group
  • the first CORESET group is a CORESET group among all CORESET groups of the first terminal device
  • each CORESET group includes one or more CORESETs.
  • all PDCCH transmissions performed by the first terminal device using the same CORESET group use the above L DMRS antenna ports
  • the DMRS antenna ports used for PDCCH transmissions performed on different CORESET groups are independently configured, which can be the same or different.
  • the first terminal device uses the above L DMRS antenna ports to monitor PDCCH on all SS set(s) associated with the first CORESET group.
  • the first information indicates the DMRS antenna port at the SS set granularity, that is, the first information indicates that the first terminal device uses L DMRS antenna ports on the fifth SS set to detect the first PDCCH.
  • the fifth SS set is one SS set among all SS sets of the first terminal device.
  • all PDCCH transmissions performed by the first terminal device using the same SS set use the above L DMRS antenna ports.
  • the DMRS ports used for PDCCH transmissions performed by the first terminal device on different SS sets are independently configured and can be the same or different.
  • the first terminal device uses the above L DMRS antenna ports to monitor PDCCH on the fifth SS set.
  • the first information indicates the DMRS antenna port at the granularity of the SS set group, that is, the first information indicates that the first terminal device uses L DMRS antenna ports on the first SS set group to detect the first PDCCH.
  • the first SS set group is one SS set group among all SS set groups of the first terminal device. Each SS set group includes one or more SS sets.
  • all PDCCH transmissions performed by the first terminal device using the same SS set group use the above L DMRS antenna ports.
  • the DMRS ports used for PDCCH transmissions performed by the first terminal device on different SS set groups are independently configured and can be the same or different.
  • the first terminal device uses the above L DMRS antenna ports to monitor PDCCH on the first SS set group.
  • the first information may be carried in at least one of the following:
  • Radio resource control (RRC) signaling system broadcast information block (SIB), multimedia access control layer control element (MAC CE), or downlink control information (DCI), etc.
  • SIB system broadcast information block
  • MAC CE multimedia access control layer control element
  • DCI downlink control information
  • a possible implementation method corresponds to the case where the first information is carried in a DCI, and the DCI corresponds to a first terminal device group.
  • the first terminal device group includes at least one terminal device.
  • the first information is carried in a first information block of the DCI, wherein the first information block corresponds to one or more terminal devices in the first terminal device group, and the one or more terminal devices include the first terminal device.
  • the DCI carrying the first information can be a terminal device group common DCI, such as a UE group common DCI, which is dedicated to indicating the L DMRS antenna ports used by each terminal device in a terminal device group (such as the above-mentioned first terminal device group).
  • the DCI carrying the first information includes X information blocks, the number of bits occupied by each information block is greater than or equal to 1, and each information block is associated with one or more
  • the terminal device corresponds to the PDCCH DMRS antenna port of the corresponding terminal device.
  • X is a positive integer greater than or equal to 1.
  • the first information is carried in the first information block, thereby indicating the L DMRS antenna ports for the first terminal device.
  • the first information block of the first DCI indicates the DMRS antenna port used to monitor the first PDCCH.
  • the communication method of the present application comprises the following steps:
  • the first terminal device determines L DMRS antenna ports according to the second information.
  • the second information is introduced in combination with the following three possible implementation modes:
  • the second information includes a radio network temporary identity (RNTI) of the first terminal device, such as a cell radio network temporary identity (C-RNTI). That is, the L DMRS antenna ports are determined based on the RNTI of the first terminal device.
  • RNTI radio network temporary identity
  • C-RNTI cell radio network temporary identity
  • n RNTI mod N the numbering of the L DMRS antenna ports satisfies: n RNTI mod N, wherein n RNTI represents the value of the RNTI of the first terminal device, and mod is a modulo operation.
  • n RNTI mod N the numbering of a DMRS antenna port among the L DMRS antenna ports satisfies: n RNTI mod N, wherein n RNTI represents the value of the RNTI of the first terminal device, and mod is a modulo operation.
  • the above formula i.e., n RNTI mod N
  • n RNTI mod N defines the numbering of the first DMRS antenna port among the L DMRS antenna ports, and the numbering of the remaining L-1 DMRS antenna ports increases successively, such as the numbering of the Mth DMRS antenna port among the L DMRS antenna ports satisfies: (n RNTI mod N+M-1)mod N.
  • the second information includes the RNTI of the first terminal device and the number of the first time unit. That is, the L DMRS antenna ports are determined according to the RNTI of the first terminal device and the number of the first time unit.
  • n RNTI represents the value of the RNTI of the first terminal device
  • a and D are positive integers
  • mod is a modulo operation.
  • the above formula defines the number of the first DMRS antenna port among the L DMRS antenna ports, and the numbers of the remaining L-1 DMRS antenna ports increase in sequence, such as the number of the Mth DMRS antenna port among the L DMRS antenna ports satisfies:
  • the first time unit can be understood as a time unit in which the first terminal device detects the first PDCCH.
  • the first terminal device receives the first PDCCH through the L DMRS antenna ports in the first time unit.
  • the L DMRS antenna ports are the DMRS antenna ports used by the first terminal device in the first time unit.
  • the second information includes the RNTI of the first terminal device, the number of the first time unit, and the number of the first CORESET. That is, the L DMRS antenna ports are determined according to the RNTI of the first terminal device, the number of the first time unit, and the number of the first CORESET.
  • n RNTI represents the value of the RNTI of the first terminal device
  • p represents the number of the first CORESET
  • D is a positive integer
  • mod is a modulo operation.
  • Ap is a positive integer determined according to p.
  • all CORESETs of the first terminal device are divided into three groups, and the DMRS antenna ports used for PDCCH transmission in each CORESET group are the same.
  • n RNTI represents the value of the RNTI of the first terminal device
  • p represents the number of the first CORESET
  • D is a positive integer
  • mod is a modulo operation.
  • D 65537.
  • the above formula defines the number of the first DMRS antenna port among the L DMRS antenna ports, and the numbers of the remaining L-1 DMRS antenna ports increase in sequence, such as the number of the Mth DMRS antenna port among the L DMRS antenna ports satisfies:
  • the first time unit can refer to the introduction of Example 2 and will not be repeated here.
  • the first CORESET can be understood as: the CORESET used by the first terminal device to detect the first PDCCH.
  • the first terminal device receives the first PDCCH through the above L DMRS antenna ports on the first CORESET.
  • the L DMRS antenna ports are the DMRS antenna ports used by the first terminal device on the first CORESET.
  • the DMRS antenna ports determined by the first terminal device at different times are also different, and/or, since different CORESETs have different numbers, the DMRS antenna ports determined by the first terminal device when detecting PDCCH in different CORESETs may also be different, thereby further reducing the probability of "DMRS antenna port conflict".
  • p represents the number of the first SS set, or p represents the number of the first BWP, or p represents the identifier of the first terminal device, etc., and this application does not limit this.
  • DMRS antenna port conflict can be understood as different terminal devices using the same DMRS antenna port to receive PDCCH.
  • N 8
  • the DMRS antenna port determined by the first terminal device based on Example 1 is the same as the DMRS antenna port determined by the second terminal device based on Example 1, which means that a DMRS antenna port conflict occurs.
  • the present application further includes the following steps:
  • the network device determines L’ DMRS antenna ports from N DMRS antenna ports.
  • the network device and the N DMRS antenna ports can be found in the introduction of S501 and will not be described in detail.
  • any one of the L' DMRS antenna ports is different from any one of the L DMRS antenna ports.
  • L' is a positive integer less than or equal to N.
  • S512 The network device sends a second PDCCH to the second terminal device through L’ DMRS antenna ports.
  • the second terminal device receives the second PDCCH from the network device through L’ DMRS antenna ports.
  • the second PDCCH includes data information of the second PDCCH and a DMRS of the second PDCCH.
  • the network device sends the DMRS of the second PDCCH to the second terminal device through at least one of the time domain resources, frequency domain resources, or OCC associated with L’ DMRS antenna ports, and L’ DMRS antenna ports.
  • the time domain resources, frequency domain resources, or OCC associated with L’ DMRS antenna ports, and L’ DMRS antenna ports For details, see the introduction of S502 and will not be repeated here.
  • the network device sends the data information of the second PDCCH to the second terminal device by sending the L’ antenna ports of the DMRS of the second PDCCH, instead of using any one of the time domain resources, frequency domain resources and OCC associated with the L’ DMRS antenna ports to send the data information of the second PDCCH to the second terminal device.
  • the L’ antenna ports of the DMRS of the second PDCCH instead of using any one of the time domain resources, frequency domain resources and OCC associated with the L’ DMRS antenna ports to send the data information of the second PDCCH to the second terminal device.
  • S511 and S512 are optional steps. For example, when L is less than N, the network device may execute S511 and S512. When L is equal to N, the network device may not execute S511 and S512, thereby helping to improve PDCCH demodulation performance.
  • the methods and/or steps implemented by the network device may also be implemented by components (such as processors, chips, chip systems, circuits, logic modules, or software) that can be used in the network device; the methods and/or steps implemented by the terminal device may also be implemented by components (such as processors, chips, chip systems, circuits, logic modules, or software) that can be used in the terminal device.
  • the chip system may be composed of chips, or the chip system may include chips and other discrete devices.
  • the communication device includes hardware structures and/or software modules corresponding to the execution of each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can analyze each specific The present invention may use different methods to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the embodiment of the present application can divide the functional modules of the communication device according to the above method embodiment.
  • each functional module can be divided according to each function, or two or more functions can be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be pointed out that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.
  • Fig. 20 shows a schematic diagram of the structure of a communication device 2000.
  • the communication device 2000 includes a processing module 2001 and a transceiver module 2002.
  • the communication device 2000 can be used to implement the functions of the above-mentioned network device or terminal device.
  • the communication device 2000 may further include a storage module (not shown in FIG. 20 ) for storing program instructions and data.
  • the transceiver module 2002 may also be referred to as a transceiver unit for implementing a sending and/or receiving function.
  • the transceiver module 2002 may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module 2002 may include a receiving module and a sending module, which are respectively used to execute the receiving and sending steps performed by the network device or terminal device in the above-mentioned method embodiment, and/or used to support other processes of the technology described in this document; the processing module 2001 may be used to execute the processing steps (such as determination, etc.) performed by the network device or terminal device in the above-mentioned method embodiment, and/or used to support other processes of the technology described in this document.
  • the transceiver module receives/sends information, which can also be understood as the processing module receives/sends information through the transceiver module.
  • the processing module receives/sends information through the transceiver module, which can also be understood as: the processing module controls the transceiver module to receive/send information.
  • the processing module sends information through the transceiver module, which can be understood as: the processing module outputs information to the transceiver module, and the transceiver module sends the information; the processing module receives information through the transceiver module, which can be understood as: the transceiver module receives information and inputs the information to the processing module.
  • the communication device 2000 may be presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here may refer to a specific application-specific integrated circuit (ASIC), a circuit, a processor and a memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above functions.
  • ASIC application-specific integrated circuit
  • the function/implementation process of the transceiver module 2002 can be implemented through the input and output interface (or communication interface) of the chip or the chip system, and the function/implementation process of the processing module 2001 can be implemented through the processor (or processing circuit) of the chip or the chip system.
  • the communication device 2000 provided in this embodiment can execute the above method, the technical effects that can be obtained can refer to the above method embodiments and will not be repeated here.
  • the network device or terminal device described in the embodiments of the present application can also be implemented using the following: one or more field programmable gate arrays (FPGA), programmable logic devices (PLD), controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits that can perform the various functions described throughout the present application.
  • FPGA field programmable gate arrays
  • PLD programmable logic devices
  • controllers state machines
  • gate logic discrete hardware components
  • discrete hardware components any other suitable circuits, or any combination of circuits that can perform the various functions described throughout the present application.
  • the network device or terminal device described in the embodiment of the present application can be implemented by a general bus architecture.
  • Figure 21 is a structural diagram of a communication device 2100 provided in an embodiment of the present application, and the communication device 2100 includes a processor 2101 and a transceiver 2102.
  • the communication device 2100 can be a network device, or a chip or chip system therein; or, the communication device 2100 can be a terminal device, or a chip or module therein.
  • Figure 21 only shows the main components of the communication device 2100.
  • the communication device 2100 may further include a memory 2103, and an input and output device (not shown in the figure).
  • the processor 2101 is mainly used to process the communication protocol and communication data, and to control the entire communication device, execute the software program, and process the data of the software program.
  • the memory 2103 is mainly used to store the software program and data.
  • the transceiver 2102 may include a radio frequency circuit and an antenna, and the radio frequency circuit is mainly used for converting the baseband signal and the radio frequency signal and processing the radio frequency signal.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • the input and output devices such as a touch screen, a display screen, a keyboard, etc., are mainly used to receive data input by the user and output data to the user.
  • the processor 2101, the transceiver 2102, and the memory 2103 may be connected via a communication bus.
  • the memory 2103 may exist independently of the processor 2101, or may be integrated with the processor 2101.
  • the memory 2103 may be located inside the communication device 2100, or may be located outside the communication device 2100, without limitation.
  • the processor 2101 can read the software program in the memory 2103, interpret and execute the instructions of the software program. Commands are used to process the data of the software program.
  • the processor 2101 performs baseband processing on the data to be sent, and then outputs the baseband signal to the RF circuit.
  • the RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna.
  • the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor 2101.
  • the processor 2101 converts the baseband signal into data and processes the data.
  • the RF circuit and antenna may be arranged independently of the processor performing baseband processing.
  • the RF circuit and antenna may be arranged remotely from the communication device.
  • the above-mentioned communication device 2000 may take the form of the communication device 2100 shown in FIG. 21 .
  • the function/implementation process of the processing module 2001 in FIG20 can be implemented by the processor 2101 in the communication device 2100 shown in FIG21 calling the computer execution instructions stored in the memory 2103.
  • the function/implementation process of the transceiver module 2002 in FIG20 can be implemented by the transceiver 2102 in the communication device 2100 shown in FIG21.
  • the network device or terminal device in the present application may adopt the composition structure shown in Figure 22, or include the components shown in Figure 22.
  • Figure 22 is a composition diagram of a communication device 2200 provided in the present application.
  • the communication device 2200 includes at least one processor 2201.
  • the communication device also includes a communication interface 2202.
  • the device 2200 can implement the method provided by any of the aforementioned embodiments and any possible designs thereof.
  • the processor 2201 is used to implement the method provided by any of the aforementioned embodiments and any possible designs thereof through a logic circuit or execution code instructions.
  • the communication interface 2202 may be used to receive program instructions and transmit them to the processor, or the communication interface 2202 may be used for the communication device 2200 to communicate and interact with other communication devices, such as interactive control signaling and/or business data, etc.
  • the communication interface 2202 may be used to receive signals from other devices outside the communication device 2200 and transmit them to the processor 2201 or to send signals from the processor 2201 to other communication devices outside the communication device 2200.
  • the communication interface 2202 may be a code and/or data read/write interface circuit, or the communication interface 2202 may be a signal transmission interface circuit between a communication processor and a transceiver, or may be a pin of a chip.
  • the communication device 2200 may further include at least one memory 2203, which may be used to store required program instructions and/or data.
  • the memory 2203 may exist independently of the processor 2201, or may be integrated with the processor 2201.
  • the memory 2203 may be located inside the communication device 2200, or may be located outside the communication device 2200, without limitation.
  • the communication device 2200 may further include a power supply circuit 2204, which may be used to supply power to the processor 2201.
  • the power supply circuit 2204 may be located in the same chip as the processor 2201, or in another chip other than the chip where the processor 2201 is located.
  • the communication device 2200 may further include a bus 2205 , and various parts of the communication device 2200 may be interconnected via the bus 2205 .
  • the communication device 2000 shown in FIG. 20 may take the form of the communication device 2200 shown in FIG. 22 .
  • the function/implementation process of the processing module 2001 in FIG20 can be implemented by the processor 2201 in the communication device 2200 shown in FIG22 calling the computer execution instructions stored in the memory 2203.
  • the function/implementation process of the transceiver module 2002 in FIG20 can be implemented by the communication interface 2202 in the communication device 2200 shown in FIG22.
  • the structure shown in FIG. 22 does not constitute a specific limitation on the network device or terminal device.
  • the network device or terminal device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently.
  • the components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.
  • the processor in the present application may be a central processing unit (CPU), which may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, etc.
  • CPU central processing unit
  • DSP digital signal processors
  • ASIC application-specific integrated circuits
  • FPGA field programmable gate arrays
  • a general-purpose processor may be a microprocessor, or the processor may also be any conventional processor, etc.
  • the memory in the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), or a programmable read-only memory (PROM).
  • the volatile memory may be a random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static RAM
  • DRAM dynamic random access memory
  • SDRAM synchronous DRAM
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous link dynamic random access memory
  • DR RAM direct rambus RAM
  • the power supply circuit described in the embodiments of the present application includes but is not limited to at least one of the following: a power supply line, a power supply subsystem, a power management chip, a power consumption management processor, or a power consumption management control circuit.
  • an embodiment of the present application further provides a communication device, which includes a processor for implementing a method in any of the above method embodiments.
  • the communication device further includes a memory.
  • the memory is used to store necessary computer programs and data.
  • the computer program may include instructions, and the processor may call the instructions in the computer program stored in the memory to instruct the communication device to execute the method in any of the above method embodiments.
  • the memory may not be in the communication device.
  • the communication device also includes an interface circuit, which is a code/data read/write interface circuit, which is used to receive computer execution instructions (computer execution instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor.
  • an interface circuit which is a code/data read/write interface circuit, which is used to receive computer execution instructions (computer execution instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor.
  • the communication device further includes a communication interface, and the communication interface is used to communicate with a module outside the communication device.
  • the communication device can be a chip or a chip system.
  • the communication device can be composed of chips, or it can include chips and other discrete devices.
  • the embodiments of the present application do not specifically limit this.
  • the present application also provides a computer-readable storage medium on which a computer program or instruction is stored.
  • a computer program or instruction is stored on which a computer program or instruction is stored.
  • the present application also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.
  • the systems, devices and methods described in the present application can also be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, i.e., they may be located in one place, or they may be distributed over multiple network units.
  • the components shown as units may or may not be physical units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or may contain one or more servers, data centers, and other data storage media that can be integrated with the medium.
  • the available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive (SSD)).
  • the computer may include the aforementioned device.

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Abstract

本申请提供一种通信方法及装置，涉及通信技术领域。该方法包括：网络设备从N个解调参考信号DMRS天线端口中确定L个DMRS天线端口，N个DMRS天线端口用于物理下行控制信道PDCCH传输，N个DMRS天线端口中任意两个DMRS天线端口之间通过以下至少一项进行正交复用：时分复用TDM，频分复用FDM，或码分复用CDM。N为大于或等于2的正整数，L为小于或等于N的正整数。网络设备通过L个DMRS天线端口发送第一PDCCH的DMRS。

Description

一种通信方法及装置
本申请要求于2023年11月30日提交至中国国家知识产权局、申请号为202311637463.4、发明名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
随着通信技术的发展，新无线(new radio，NR)通信系统中提出了多用户多输入多输出(multi-user multiple-input multiple-output，MU-MIMO)技术，即允许多个终端设备在同一时频资源上与网络设备进行通信，多个终端设备通过空分方式共享同一时频资源。
然而，在多个物理下行控制信道(physical downlink control channel，PDCCH)采用MU-MIMO传输时，多个PDCCH的解调参考信号(demodulation signal，DMRS)可能无法保证正交，从而导致PDCCH解调性能受限，也影响PDCCH容量。
发明内容
为了解决上述技术问题，本申请提供一种通信方法及装置，能够提升PDCCH解调性能和容量。为达到上述目的，本申请采用如下技术方案：
第一方面，提供一种通信方法。该方法可以由网络设备执行，在并不特殊说明的情况下，本申请中的“网络设备”既可以指所述网络设备本身，也可以是所述网络设备中的组件(例如，处理器、芯片、或芯片系统等)，或者也可以是能实现全部或部分网络设备功能的逻辑模块或软件。下面，以执行主体是所述网络设备为例进行描述。所述方法包括：
所述网络设备从N个解调参考信号DMRS天线端口中确定L个DMRS天线端口，所述N个DMRS天线端口用于物理下行控制信道PDCCH传输，所述N个DMRS天线端口中任意两个DMRS天线端口之间通过以下至少一项进行正交复用：时分复用TDM，频分复用FDM，或码分复用CDM。N为大于或等于2的正整数，L为小于或等于N的正整数。所述网络设备通过所述L个DMRS天线端口发送第一PDCCH的DMRS。
其中，所述任意两个DMRS天线端口之间TDM是指，不同的DMRS天线端口关联或者使用不同的时域资源。这样一来，不同DMRS天线端口上传输的PDCCH DMRS即可使用不同的时域资源，从而保证了不同的PDCCH的DMRS之间相互正交。
其中，所述任意两个DMRS天线端口之间FDM是指，不同的DMRS天线端口关联或者使用不同的频域资源。这样一来，不同DMRS天线端口上传输的PDCCH DMRS即可使用不同的频域资源，从而保证了不同的PDCCH的DMRS之间相互正交。
其中，所述任意两个DMRS天线端口之间CDM是指，不同的DMRS天线端口关联或者使用不同的正交掩码OCC。这样一来，不同DMRS天线端口上传输的PDCCH DMRS即可使用不同的正交掩码，从而保证了不同的PDCCH的DMRS之间相互正交。
其中，针对所述第一PDCCH的DMRS，所述网络设备通过所述L个DMRS天线端口发送所述第一PDCCH的DMRS，包括：所述网络设备通过所述L个DMRS天线端口所关联的时域资源、频域资源、或正交掩码OCC中的至少一项，以及所述L个DMRS天线端口，发送所述第一PDCCH的DMRS。
另外，所述第一PDCCH还包括数据信息。针对所述第一PDCCH的数据信息，所述网络设备通过所述L个DMRS天线端口发送所述第一PDCCH的数据信息，包括：所述网络设备通过所述L个天线端口发送所述第一PDCCH的数据信息，而非使用所述L个DMRS天线端口所关联的时域资源、频域资源和OCC中的任意一项，发送所述第一PDCCH的数据信息。
可选地，对应于L小于N，所述网络设备还可以执行如下操作：所述网络设备从所述N个DMRS天线端口中确定L’个DMRS天线端口，所述L’个DMRS天线端口中任意一个DMRS天线端口与所述L个DMRS天线端口中任意一个DMRS天线端口不同。L’为小于或等于N的正整数。所述网络设备通过所述L’个DMRS天线端口发送第二PDCCH的DMRS。所述第二PDCCH与所述第一PDCCH不同。
如此一来，由于所述N个DMRS天线端口能够用于PDCCH传输，且所述N个DMRS天线端口之间相互正交，所以，通过所述N个DMRS天线端口中不同DMRS天线端口传输不同PDCCH DMRS的 情况下，使得不同PDCCH的DMRS相互正交，比如，所述第一PDCCH的DMRS与其他PDCCH的DMRS相互正交，有助于提升PDCCH解调性能和PDCCH容量，保障PDCCH性能。
在一种可能的设计中，在所述N个DMRS天线端口中任意两个DMRS天线端口之间通过所述CDM进行正交复用的情况下，所述N个DMRS天线端口中任意两个DMRS天线端口之间关联不同的频域正交掩码OCC和/或不同的时域OCC，以使上述任意两个DMRS天线端口之间相互正交。
在一种可能的设计中，在所述N个DMRS天线端口中任意两个DMRS天线端口之间通过所述CDM和所述FDM进行正交复用的情况下：
所述N个DMRS天线端口属于至少两个CDM组，所述至少两个CDM组中每个CDM组包括所述N个DMRS天线端口中的一部分天线端口。其中，所述至少两个CDM组中不同CDM组所包括的DMRS天线端口数量，可以相同，也可以不同。
所述至少两个CDM组中任意一个CDM组中任意两个DMRS天线端口之间关联不同的频域OCC和/或不同的时域OCC，以使每个CDM组内的任意两个DMRS天线端口之间相互正交。
所述至少两个CDM组中任意两个CDM组之间关联不同的频域资源，以使不同CDM组之间的任意两个DMRS天线端口之间相互正交。
在一种可能的设计中，所述第一PDCCH的传输资源包括多个资源单元组REG，所述多个REG中每个REG包括M个第一资源单元RE，所述M个第一RE用于承载PDCCH的DMRS，M为大于3的正整数。其中，所述多个REG中每个REG包括时域上1个正交频分复用OFDM符号和频域上1个资源块RB。
例如，M为偶数，M＝4。
如此一来，所述N个DMRS天线端口能够支持关联频域OCC，且避免DMRS开销过大，还能够保证DMRS性能。
在一种可能的设计中，所述第一PDCCH的时域资源包括K个符号，所述K个符号包括第一符号和第二符号。K为大于或等于2的正整数。所述第一PDCCH包括所述第一PDCCH的数据信息和所述第一PDCCH的DMRS。所述第一PDCCH的数据信息占用所述第一符号，所述第一PDCCH的DMRS占用所述第二符号。也就是说，所述第一PDCCH的数据信息和所述第一PDCCH的DMRS之间采用TDM方式传输。
在一种可能的设计中，所述频域OCC的长度为2或者4，所述时域OCC的长度为2或者4。
在一种可能的设计中，所述N的取值包括2T或3*Q，T和Q为正整数。
例如，所述N的取值包括以下其中之一：2、3、4、6、8、12、或16。
在一种可能的设计中，所述方法还包括：所述网络设备发送第一信息。其中，所述第一信息指示所述L个天线端口。所述第一信息承载于以下其中之一：无线资源控制RRC信令，系统广播信息块SIB，下行控制信息DCI，或媒体接入控制层控制单元MAC CE。
也就是说，所述网络设备为第一终端设备指示：通过哪一(些)DMRS天线端口检测所述第一PDCCH，以简化终端设备侧的运算复杂度。
在一种可能的设计中，所述第一信息指示所述L个天线端口，包括：所述第一信息指示第一终端设备在第一搜索空间集合SS set上使用所述L个DMRS天线端口检测所述第一PDCCH。
其中，所述第一SS set是所述第一终端设备的所有控制资源集合CORESET所关联的所有SS set。也就是说，所述网络设备是通过所述第一信息以终端设备粒度指示DMRS天线端口的。
或者，所述第一SS set是第一带宽部分BWP上的所有CORESET所关联的所有SS set，所述第一BWP是所述第一终端设备的所有BWP中的一个BWP。也就是说，所述网络设备是通过所述第一信息以BWP粒度指示DMRS天线端口的。
或者，所述第一SS set是在第一CORESET所关联的所有SS set，所述第一CORESET是所述第一终端设备的所有CORESET中的一个CORESET。也就是说，所述网络设备是通过所述第一信息以CORESET粒度指示DMRS天线端口的。
或者，所述第一SS set是所述第一终端设备的所有SS set中的一个SS set。也就是说，所述网络设备是通过所述第一信息以SS set粒度指示DMRS天线端口的。
在一种可能的设计中，所述第一信息指示所述L个天线端口，包括：所述第一信息指示第一终端设备在第一CORESET组所关联的所有SS set上使用所述L个DMRS天线端口检测所述第一PDCCH，所述 第一CORESET组是所述第一终端设备的所有CORESET组中的一个CORESET组。也就是说，所述网络设备是通过所述第一信息以CORESET组粒度指示DMRS天线端口的。
在一种可能的设计中，所述第一信息指示所述L个天线端口，包括：所述第一信息指示第一终端设备在第一SS set组上使用所述L个DMRS天线端口检测所述第一PDCCH，所述第一SS set组是所述第一终端设备的所有SS set组中的一个SS set组。也就是说，所述网络设备是通过所述第一信息以SS set组粒度指示DMRS天线端口的。
在一种可能的设计中，所述DCI对应第一终端设备组，所述第一终端设备组包括至少一个终端设备。所述第一信息承载于所述DCI的第一信息块，所述第一信息块对应所述第一终端设备组中的一个或多个终端设备，所述一个或多个终端设备包括第一终端设备。
也就是说，所述网络设备通过同一DCI为不同的终端设备指示DMRS天线端口。
在一种可能的设计中，所述L个DMRS天线端口是根据所述第一终端设备的无线网络临时标识RNTI确定的，例如所述第一终端设备的小区无线网络临时标识C-RNTI。
例如，L＝1。所述L个DMRS天线端口的编号满足：nRNTImod N。其中，nRNTI表示所述RNTI的值，mod为取模操作。
在一种可能的设计中，所述L个DMRS天线端口是根据所述第一终端设备的无线网络临时标识RNTI和第一时间单元的编号确定的。例如，所述第一终端设备的RNTI可以是C-RNTI。
例如，L＝1。所述L个DMRS天线端口的编号满足：Y-1＝nRNTI。其中，nRNTI表示所述RNTI的值，表示所述第一时间单元的编号，A和D为正整数，mod为取模操作。
在一种可能的设计中，所述L个DMRS天线端口是根据所述第一终端设备的无线网络临时标识RNTI和第一时间单元的编号以及第一CORESET的编号确定的。例如，所述第一终端设备的RNTI可以是C-RNTI。
例如，L＝1。所述L个DMRS天线端口的编号满足：Yp,-1＝nRNTI。其中，nRNTI表示所述RNTI的值，表示所述第一时间单元的编号，p表示所述第一CORESET的编号，D为正整数，Ap是根据p确定的正整数，mod为取模操作。
第二方面，提供一种通信方法。该方法可以由第一终端设备执行，在并不特殊说明的情况下，本申请中的“第一终端设备”既可以指所述第一终端设备本身，也可以是所述第一终端设备中的组件(例如，处理器、芯片、或芯片系统等)，或者也可以是能实现全部或部分第一终端设备功能的逻辑模块或软件。下面，以执行主体是所述第一终端设备为例进行描述。所述方法包括：所述第一终端设备确定L个解调参考信号DMRS天线端口，所述L个DMRS天线端口是N个DMRS天线端口中的一个或多个DMRS天线端口，所述N个DMRS天线端口用于物理下行控制信道PDCCH传输，所述N个DMRS天线端口中任意两个DMRS天线端口之间通过以下至少一项进行正交复用：时分复用TDM，频分复用FDM，或码分复用CDM。N为大于或等于2的正整数，L为小于或等于N的正整数。所述第一终端设备通过所述L个DMRS天线端口接收第一PDCCH的DMRS。
在一种可能的设计中，在所述N个DMRS天线端口中任意两个DMRS天线端口之间通过所述CDM进行正交复用的情况下，所述N个DMRS天线端口中任意两个DMRS天线端口之间关联不同的频域正交掩码OCC和/或不同的时域OCC，以使上述任意两个DMRS天线端口之间相互正交。
在一种可能的设计中，在所述N个DMRS天线端口中任意两个DMRS天线端口之间通过所述CDM和所述FDM进行正交复用的情况下：
所述N个DMRS天线端口属于至少两个CDM组，所述至少两个CDM组中每个CDM组包括所述N个DMRS天线端口中的一部分天线端口。其中，所述至少两个CDM组中不同CDM组所包括的DMRS天线端口数量，可以相同，也可以不同。
所述至少两个CDM组中任意一个CDM组中任意两个DMRS天线端口之间关联不同的频域OCC和/或不同的时域OCC，以使每个CDM组内的任意两个DMRS天线端口之间相互正交。
所述至少两个CDM组中任意两个CDM组之间关联不同的频域资源，以使不同CDM组之间 的任意两个DMRS天线端口之间相互正交。
在一种可能的设计中，所述第一PDCCH的传输资源包括多个资源单元组REG，所述多个REG中每个REG包括M个第一资源单元RE，所述M个第一RE用于承载PDCCH的DMRS，M为大于3的正整数。其中，所述多个REG中每个REG包括时域上1个正交频分复用OFDM符号和频域上1个资源块RB。
例如，M为偶数，M＝4。
在一种可能的设计中，所述第一PDCCH的时域资源包括K个符号，所述K个符号包括第一符号和第二符号。K为大于或等于2的正整数。所述第一PDCCH包括所述第一PDCCH的数据信息和所述第一PDCCH的DMRS。所述第一PDCCH的数据信息占用所述第一符号，所述第一PDCCH的DMRS占用所述第二符号。
在一种可能的设计中，所述频域OCC的长度为2或者4，所述时域OCC的长度为2或者4。
在一种可能的设计中，所述N的取值包括2T或3*Q，T和Q为正整数。
例如，所述N的取值包括以下其中之一：2、3、4、6、8、12、或16。
在一种可能的设计中，所述方法还包括：所述第一终端设备接收第一信息。其中，所述第一信息指示所述L个天线端口。所述第一信息承载于以下其中之一：无线资源控制RRC信令，系统广播信息块SIB，下行控制信息DCI，或媒体接入控制层控制单元MAC CE。
在一种可能的设计中，所述第一信息指示所述L个天线端口，包括：所述第一信息指示所述第一终端设备在第一搜索空间集合SS set上使用所述L个DMRS天线端口检测所述第一PDCCH。
其中，所述第一SS set是所述第一终端设备的所有控制资源集合CORESET所关联的所有SS set。
或者，所述第一SS set是第一带宽部分BWP上的所有CORESET所关联的所有SS set，所述第一BWP是所述第一终端设备的所有BWP中的一个BWP。
或者，所述第一SS set是在第一CORESET所关联的所有SS set，所述第一CORESET是所述第一终端设备的所有CORESET中的一个CORESET。
或者，所述第一SS set是所述第一终端设备的所有SS set中的一个SS set。
在一种可能的设计中，所述第一信息指示所述L个天线端口，包括：所述第一信息指示所述第一终端设备在第一CORESET组所关联的所有SS set上使用所述L个DMRS天线端口检测所述第一PDCCH，所述第一CORESET组是所述第一终端设备的所有CORESET组中的一个CORESET组。
在一种可能的设计中，所述第一信息指示所述L个天线端口，包括：所述第一信息指示所述第一终端设备在第一SS set组上使用所述L个DMRS天线端口检测所述第一PDCCH，所述第一SS set组是所述第一终端设备的所有SS set组中的一个SS set组。
在一种可能的设计中，所述DCI对应第一终端设备组，所述第一终端设备组包括至少一个终端设备。所述第一信息承载于所述DCI的第一信息块，所述第一信息块对应所述第一终端设备组中的一个或多个终端设备，所述一个或多个终端设备包括所述第一终端设备。
在一种可能的设计中，所述L个DMRS天线端口是根据所述第一终端设备的无线网络临时标识RNTI确定的。
例如，L＝1。所述L个DMRS天线端口的编号满足：nRNTImod N。其中，nRNTI表示所述RNTI的值。
在一种可能的设计中，所述L个DMRS天线端口是根据所述第一终端设备的无线网络临时标识RNTI和第一时间单元的编号确定的。
例如，L＝1。所述L个DMRS天线端口的编号满足：Y-1＝nRNTI。其中，nRNTI表示所述RNTI的值，表示所述第一时间单元的编号，A和D为正整数。
在一种可能的设计中，所述L个DMRS天线端口是根据所述第一终端设备的无线网络临时标识RNTI和第一时间单元的编号以及第一CORESET的编号确定的。
例如，L＝1。所述L个DMRS天线端口的编号满足：Yp,-1＝nRNTI。其中，nRNTI表示所述RNTI的值，表示所述第一时间单元的编号，p表示所述第一CORESET的编号，D为正整数，Ap是根据p确定的正整数。
其中，第二方面或第二方面中任一种设计方式所带来的技术效果可参见第一方面中不同设计方式所带来的技术效果，在此不再赘述。
第三方面，提供了一种通信装置用于实现上述各种方法。所述通信装置包括实现方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与功能相对应的模块或单元。
在一些可能的设计中，该通信装置可以包括处理模块和收发模块。该处理模块，可以用于实现上述任一方面及其任意可能的实现方式中的处理功能。该收发模块，也可以称为收发单元，用以实现上述任一方面及其任意可能的实现方式中的发送和/或接收功能。该收发模块可以由收发电路，收发机，收发器或者通信接口构成。
在一些可能的设计中，收发模块包括发送模块和/或接收模块，分别用于实现上述任一方面及其任意可能的实现方式中的发送或接收功能。
第四方面，提供一种通信装置，包括：处理器和存储器，所述处理器和所述存储器耦合，所述存储器存储有程序指令，当所述存储器存储的程序指令被所述处理器执行时，使得所述通信装置执行如上述任一方面或任一方面任一种可能的设计中的方法。
第五方面，提供了一种通信装置，包括：处理器；所述处理器用于执行计算机程序或指令，以使该通信装置执行任一方面所述的方法或任一方面任一种可能的设计中的方法。可选地，该通信装置还包括存储器，该存储器可以与处理器耦合，或者，该存储器也可以独立于处理器存在，例如，存储器和处理器为两个独立的模块。该存储器可以位于所述通信装置之外，也可以位于所述通信装置之内。
第六方面，提供了一种计算机可读存储介质。该计算机可读存储介质存储有计算机程序或指令，当其被运行时，使得上述任一方面所述的方法或任一方面任一种可能的设计中的方法被执行。
第七方面，提供了一种包含指令的计算机程序产品，当其被运行时，使得上述任一方面所述的方法或任一方面任一种可能的设计中的方法被执行。
第三方面至第七方面中任一方面提供的通信装置可以为第一方面中的网络设备，或所述网络设备所包含的部件，比如芯片或芯片系统；或者，所述通信装置可以为第二方面中的第一终端设备，或所述第一终端设备所包含的部件，比如芯片或芯片系统。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
可以理解的是，第三方面至第七方面中任一方面提供的通信装置是芯片时，通信装置的发送动作/功能可以理解为输出信息，通信装置的接收动作/功能可以理解为输入信息。
第八方面，提供了一种通信装置，用于实现上述任一方面所述的方法或任一方面任一种可能的设计中的方法。可选地，该通信装置包括终端设备、网络设备、芯片系统或芯片，其中所述终端设备可称为第一终端设备。
其中，第三方面至第八方面中任一种设计方式所带来的技术效果可参见第一方面中不同设计方式所带来的技术效果，在此不再赘述。
附图说明
图1为本申请实施例提供的一种通信系统的架构示意图；
图2为本申请实施例提供的一种控制资源集合配置示意图；
图3a为本申请实施例提供的一种PDCCH的时频资源分布示意图；
图3b为本申请实施例提供的一种控制资源集合的时频资源分布示意图；
图3c为本申请实施例提供的再一种控制资源集合的时频资源分布示意图；
图4为本申请实施例提供的一种解调参考信号的位置分布示意图；
图5为本申请实施例提供的一种通信方法的流程示意图；
图6为本申请实施例提供的再一种解调参考信号的位置分布示意图；
图7为本申请实施例提供的一种正交掩码的分布示意图；
图8为本申请实施例提供的再一种正交掩码的分布示意图；
图9为本申请实施例提供的又一种正交掩码的分布示意图；
图10为本申请实施例提供的又一种正交掩码的分布示意图；
图11为本申请实施例提供的又一种正交掩码的分布示意图；
图12为本申请实施例提供的又一种正交掩码的分布示意图；
图13为本申请实施例提供的又一种正交掩码的分布示意图；
图14为本申请实施例提供的又一种正交掩码的分布示意图；
图15为本申请实施例提供的又一种正交掩码的分布示意图；
图16为本申请实施例提供的又一种正交掩码的分布示意图；
图17为本申请实施例提供的再一种通信方法的流程示意图；
图18为本申请实施例提供的一种信息块分布示意图；
图19为本申请实施例提供的又一种通信方法的流程示意图；
图20为本申请实施例提供的一种通信装置的结构示意图；
图21为本申请实施例提供的又一种通信装置的结构示意图；
图22为本申请实施例提供的又一种通信装置的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
在本申请中，术语“系统”可以和“网络”相互替换。本申请将围绕可包括多个设备、组件、模块等的系统来呈现各个方面、实施例或特征。应当理解和明白的是，各个系统可以包括另外的设备、组件、模块等，并且/或者可以并不包括结合附图讨论的所有设备、组件、模块等。此外，还可以使用这些方案的组合。
另外，在本申请实施例中，“示例性地”、“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用示例的一词旨在以具体方式呈现概念。
本申请实施例中，“的(of)”，“相应地(corresponding，relevant)”和“对应的(corresponding)”有时可以混用，应当指出的是，在不强调其区别时，其所要表达的含义是一致的。
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
图1是本申请的实施例应用的通信系统1000的架构示意图。如图1所示，该通信系统1000包括至少一个网络设备(如图1中的110a和110b)和至少一个终端设备(如图1中的120a-120j)。其中，终端设备可以通过无线的方式与网络设备通信。可选地，不同的网络设备之间可以相互通信。可选地，不同的终端设备之间可以相互通信。
需要指出的是，图1仅是示意图，虽然未示出，但是该通信系统1000还可以包括其它网络设备，如该通信系统1000还可以包括核心网(core network，CN)设备、无线中继设备和无线回传设备中的一个或多个，在此不做具体限定。
其中，网络设备可以通过无线或有线方式与核心网设备连接。核心网设备与网络设备可以是独立的不同的物理设备，也可以是将核心网设备的功能与网络设备的逻辑功能集成在同一个物理设备上，还可以是一个物理设备上集成了部分核心网设备的功能和部分的网络设备的功能，本申请实施例对此不做具体限定。
可选地，网络设备是一种具有无线收发功能的网络侧设备。网络设备可以是无线接入网(radio access network，RAN)中为终端设备提供无线通信功能的装置，称为RAN设备。RAN可以为第三代合作伙伴计划(3rd generation partnership project，3GPP)中的接入网，例如，4G、5G、或面向未来的6G网络。RAN还可以是开放式接入网(open RAN，O-RAN或ORAN)、云无线接入网络(cloud radio access network，CRAN)、或者以上两种或两种以上网络的通信网络。RAN设备，可以是基站(base station)、演进型基站(evolved NodeB，eNodeB)、发送接收点(transmission reception point，TRP)、第五代(5th generation，5G)移动通信系统中的下一代基站(next generation nodeB，gNB)、第六代(6th generation，6G)移动通信系统中的下一代基站、未来移动通信系统中的基站、无线保真(wireless fidelity，WiFi)系统、远距离无线电(long range radio，LoRa)系统或车联网系统中的接入节点。RAN设备也可以是完成基站部分功能的模块或单元，例如，可以是集中式单元(central unit，CU)，也可以是分布式单元(distributed unit，DU)，还可以是无线单元(radio unit，RU)。这里的CU完成基站的无线资源控制协议和分组数据汇聚层协议(packet data convergence protocol，PDCP)的功能，还可以完成业务数据适配协议(service data adaptation protocol，SDAP)的功能；DU完成基站的 无线链路控制层和介质访问控制(medium access control，MAC)层的功能，还可以完成部分物理层或全部物理层的功能，有关上述各个协议层的具体描述，可以参考第三代合作伙伴计划(3rd generation partnership project，3GPP)的相关技术规范。CU和DU可以是单独设置，或者也可以包括在同一个网元中，例如基带单元(baseband unit，BBU)中。RU可以包括在射频设备或者射频单元中，例如包括在射频拉远单元(remote radio unit，RRU)、有源天线处理单元(active antenna unit，AAU)或远程射频头(remote radio head，RRH)中。在不同系统中，CU、DU或RU也可以有不同的名称，但是本领域的技术人员可以理解其含义。例如，在ORAN系统中，CU也可以称为O-CU(开放式CU)，DU也可以称为O-DU，RU也可以称为O-RU。本申请中的CU(或CU-CP、CU-UP)、DU和RU中的任一单元，可以是通过软件模块、硬件模块、或者软件模块与硬件模块结合来实现。无线接入网设备可以是宏基站(如图1中的110a)，也可以是微基站或室内站(如图1中的110b)，还可以是中继节点或施主节点等。本申请的实施例对无线接入网设备所采用的具体技术和具体设备形态不做限定。为了便于描述，网络设备作为无线接入网设备的简称，基站作为无线接入网设备的一个举例。
可选地，终端设备通过网络设备接入核心网。终端设备，包括向用户提供语音和/或数据连通性的设备，具体的，包括向用户提供语音的设备，或包括向用户提供数据连通性的设备，或包括向用户提供语音和数据连通性的设备。例如可以包括具有无线连接功能的手持式设备、或连接到无线调制解调器的处理设备。该终端设备可以经无线接入网与核心网进行通信，与RAN交换语音或数据，或与RAN交互语音和数据。该终端设备可以包括用户设备(user equipment，UE)、无线终端设备、移动终端设备、D2D终端设备、V2X终端设备、机器到机器/机器类通信(machine-to-machine/machine-type communications，M2M/MTC)终端设备、物联网(internet of things，IoT)终端设备、签约单元(subscriber unit)、签约站(subscriber station)、移动站(mobile station)、远程站(remote station)、接入点(access point，AP)、远程终端(remote terminal)、接入终端(access terminal)、用户终端(user terminal)、用户代理(user agent)、或用户装备(user device)等。例如，可以包括移动电话(或称为“蜂窝”电话)，具有移动终端设备的计算机，便携式、袖珍式、手持式、计算机内置的移动装置等。例如，个人通信业务(personal communication service，PCS)电话、无绳电话、会话发起协议(session initiation protocol，SIP)话机、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)等设备。还包括受限设备，例如功耗较低的设备，或存储能力有限的设备，或计算能力有限的设备等。例如包括条码、射频识别(radio frequency identification，RFID)、传感器、全球定位系统(global positioning system，GPS)、激光扫描器等信息传感设备。
而如上介绍的各种终端设备，如果位于车辆上(例如放置在车辆内或安装在车辆内)，都可以认为是车载终端设备，车载终端设备例如也称为车载单元(on-board unit，OBU)。
本申请实施例中，终端设备还可以包括中继(relay)。或者理解为，能够与基站进行数据通信的都可以看作终端设备。
本申请实施例中，用于实现终端设备的功能的装置可以是终端设备，也可以是能够支持终端设备实现该功能的装置，例如芯片系统，该装置可以被安装在终端设备中。本申请实施例中，芯片系统可以由芯片构成，也可以包括芯片和其他分立器件。本申请实施例提供的技术方案中，以用于实现终端的功能的装置是终端设备为例，进行介绍。
应理解，网络设备和终端设备可以是固定位置的，也可以是可移动的。网络设备和终端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和人造卫星上。本申请的实施例对网络设备和终端设备的应用场景不做限定。
网络设备和终端设备的角色可以是相对的。例如，图1中的直升机或无人机120i可以被配置成移动基站，对于那些通过120i接入到无线接入网的终端设备120j来说，终端设备120i是网络设备；但对于网络设备110a来说，120i是终端设备，即110a与120i之间是通过无线空口协议进行通信的。当然，110a与120i之间也可以是通过基站与基站之间的接口协议进行通信的，此时相对于110a来说，120i也是网络设备。因此，网络设备和终端设备都可以统一称为通信装置，图1中的110a和110b可以称为具有网络设备功能的通信装置，图1中120a-120j可以称为具有终端设备功能的通信装置。
网络设备和终端设备之间、网络设备和网络设备之间、终端设备和终端设备之间可以通过授权频谱进行通信，也可以通过免授权频谱进行通信，也可以同时通过授权频谱和免授权频谱进行通信；可以通过6千兆赫兹(gigahertz，GHz)以下的频谱进行通信，也可以通过6GHz以上的频谱进行通信， 还可以同时使用6GHz以下的频谱和6GHz以上的频谱进行通信。本申请的实施例对无线通信所使用的频谱资源不做限定。
在本申请的实施例中，网络设备的功能也可以由网络设备中的模块(如芯片)来执行，也可以由包含有网络设备功能的控制子系统来执行。这里的包含有网络设备功能的控制子系统可以是智能电网、工业控制、智能交通、智慧城市等上述应用场景中的控制中心。终端设备的功能也可以由终端设备中的模块(如芯片或调制解调器)来执行，也可以由包含有终端设备功能的装置来执行。
在本申请的实施例中，网络设备向终端设备发送下行信号或下行信息，下行信息承载在下行信道上；终端设备向网络设备发送上行信号或上行信息，上行信息承载在上行信道上。终端设备为了与网络设备进行通信，需要与网络设备控制的小区建立无线连接。与终端设备建立了无线连接的小区称为该终端设备的服务小区。当终端设备与该服务小区进行通信的时候，还会受到来自邻区的信号的干扰。
应当指出的是，本申请实施例中的方案还可以应用于其他通信系统中，相应地名称也可以用其他通信系统中的对应功能的名称进行替代。
为了便于理解本申请实施例，下面先对本申请实施例中涉及的术语做简单说明。应理解，这些说明仅为便于理解本申请实施例，而不应对本申请构成任何限定。
1、PDCCH
与长期演进(long term evolution，LTE)通信系统相同，NR通信系统定义了PDCCH传输下行控制信息(downlink control information，DCI)。
对于终端设备而言，终端设备可以在一个或多个搜索空间集合(search space set，SS set)盲检测来自网络设备(如基站)的候选PDCCH。
其中，SS set能够指示PDCCH在时域上的起始符号和周期。SS set，可以理解为，终端设备需要检测的候选PDCCH的集合。SS set分为公共搜索空间集合(common search space set，CSS set)和用户搜索空间集合(user search space set，USS set)。
针对PDCCH，与LTE通信系统不同的是，NR通信系统引入了控制资源集合(control resource set，CORESET)的概念。其中，CORESET能够指示PDCCH在频域上占用的频段，以及PDCCH在时域上占用的符号数量。CORESET，可以理解为，终端设备使用一个或多个SS set检测候选PDCCH时所使用的时频资源。比如，一个CORESET由频域上个资源块(resource block，RB)、时域上连续个符号组成。CORESET可以出现在带宽部分(bandwidth part，BWP)的任意时频位置，由网络设备侧通过高层信令半静态配置，每个终端设备可以配置一个或者多个CORESET，如图2所示。
一个PDCCH使用的时频资源由一个CORESET内的一个或多个控制信道元素(control channel element，CCE)聚合构成，如图3a所示。其中，CCE也可以称为聚合等级(aggregation level，AL)。
目前，NR通信系统支持的PDCCH AL包括1、2、4、8、16。一个CCE由6个资源单元组(resource element group，REG)组成，每个REG在时域上占用一个符号、在频域上占用一个RB。其中，一个RB在频域上包括12个子载波。换言之，每个REG包括12个资源单元(resource element，RE)。
对于某一个CORESET而言，CCE到REG的映射有两种方式：交织映射(interleaved mapping)和非交织映射(non-interleaved mapping)。其中，非交织映射如图3b所示，交织映射如图3c所示。
在本申请中，符号，可以是指正交频分复用(orthogonal frequency division multiplex，OFDM)符号，是OFDM系统中时域上最小的时间单元。
2、PDCCH的解调参考信号(demodulation signal，DMRS)
通常，在终端设备处理接收的PDCCH过程中，需要进行信道估计。为此，NR通信系统引入PDCCH专属的DMRS，可以描述为：PDCCH的DMRS，或PDCCH DMRS。PDCCH DMRS的引入，使能网络设备采用波束赋型方式传输PDCCH，因此，PDCCH的覆盖和性能得到提升。
示例性地，PDCCH的DMRS使用伪随机序列发送。对于某个候选PDCCH而言，在该候选PDCCH占用的某一个REG中，PDCCH的DMRS映射到该REG的部分子载波上，如每四个子载波中的第四个子载波上，如图4所示。因此，PDCCH的DMRS的开销为1/4，即每个REG有3个RE用于DMRS传输。
在本申请中，用于承载DMRS的RE，可以记为DMRS RE。
3、PDCCH的数据信息
PDCCH的数据信息，可以理解为，承载于PDCCH的DCI，可以记为：PDCCH Data。
需要指出的是，在本申请中，对于某一PDCCH而言，包括两部分，即该PDCCH的数据信息和该PDCCH的DMRS。
4、天线端口
天线端口是用于信号传输的逻辑端口，一个天线端口可以对应一个或者多个物理天线。不同的天线端口可以对应相同的物理天线，也可以对应不同的物理天线。从接收端的角度看，每一个天线端口对应于一个独立的无线信道。在3GPP NR标准中，一个天线端口定义为用于传输参考信号的天线端口，可以简称为参考信号天线端口。例如，用于传输DMRS的天线端口，可以简称为DMRS天线端口(DMRS port)。
需要指出的是，在本申请中，天线端口，均指DMRS天线端口。
另外，天线端口也简称为端口，例如，DMRS天线端口也可简称为DMRS端口。
5、PDCCH支持的天线端口
以NR通信系统为例，PDCCH仅支持单天线端口，端口号为2000。这样一来，PDCCH的DMRS也仅支持一个天线端口，即单DMRS天线端口。
通常，在多输入多输出(multiple-input multiple-output，MIMO)传输场景中，由于PDCCH仅支持单天线端口，所以，对于一个PDCCH传输来说，仅支持单流传输。
在多个PDCCH进行MU-MIMO传输场景中，网络设备采用终端设备透明方式进行处理，即：使用同一个DMRS天线端口传输多个终端设备的PDCCH。换言之，网络设备在同一时频资源上，采用同一DMRS天线端口传输多个终端设备的PDCCH。此种情况下，多个PDCCH的DMRS之间可能无法保证正交，导致PDCCH的解调性能较差。另外，在小区用户数比较多的情况下，可能出现PDCCH容量受限的问题，影响PDCCH性能。
综上可知，在NR中，PDCCH仅支持单天线端口，在多个PDCCH采用MU-MIMO传输时，由于多个PDCCH的DMRS使用同一个天线端口传输，彼此之间可能无法保证正交，从而导致PDCCH解调性能受限，也影响了PDCCH容量。
有鉴于此，本申请提供一种通信方法，该方法可以应用于图1所示的系统。该方法包括：网络设备从N个DMRS天线端口中确定L个DMRS天线端口。其中，N个DMRS天线端口用于PDCCH传输，N个DMRS天线端口中任意两个DMRS天线端口之间通过以下至少一项进行正交复用：时分复用(time division multiplexing，TDM)，频分复用(frequency division multiplexing，FDM)，或码分复用(code division multiplexing，CDM)。N为大于或等于2的正整数，L为小于或等于N的正整数。网络设备通过L个DMRS天线端口发送第一PDCCH的DMRS。
在本申请中，任意两个DMRS天线端口之间TDM是指，不同的DMRS天线端口关联或者使用不同的时域资源。这样一来，不同DMRS天线端口上传输的PDCCH DMRS即可使用不同的时域资源，从而保证了不同的PDCCH的DMRS之间相互正交。
在本申请中，任意两个DMRS天线端口之间FDM是指，不同的DMRS天线端口关联或者使用不同的频域资源。这样一来，不同DMRS天线端口上传输的PDCCH DMRS即可使用不同的频域资源，从而保证了不同的PDCCH的DMRS之间相互正交。
在本申请中，任意两个DMRS天线端口之间CDM是指，不同的DMRS天线端口关联或者使用不同的正交码(如下文所述的正交掩码)。这样一来，不同DMRS天线端口上传输的PDCCH DMRS即可使用不同的正交码，从而保证了不同的PDCCH的DMRS之间相互正交。
如此一来，由于N个DMRS天线端口能够用于PDCCH传输，且N个DMRS天线端口之间相互正交，所以，通过N个DMRS天线端口中不同DMRS天线端口传输不同PDCCH DMRS的情况下，使得不同PDCCH的DMRS相互正交，比如，第一PDCCH的DMRS与其他PDCCH的DMRS相互正交，有助于提升PDCCH解调性能和PDCCH容量。
下面，结合图5，对本申请实施例提出的通信方法进行详细介绍。
本申请实施例提出的通信方法500包括如下操作：
S501、网络设备从N个DMRS天线端口中确定L个DMRS天线端口。
其中，网络设备的介绍如下：
该步骤可以由网络设备执行，在并不特殊说明的情况下，本申请中的“网络设备”既可以指所述网络设备本身，也可以是所述网络设备中的组件(例如，处理器、芯片、或芯片系统等)，或者也可以是能实现全部或部分网络设备功能的逻辑模块或软件。
其中，L个DMRS天线端口介绍如下：
L为小于或等于N的正整数，即L个DMRS天线端口是N个DMRS天线端口中的一个或多个DMRS天线端口。
其中，N个DMRS天线端口的介绍如下：
N为大于或等于2的正整数，即N个DMRS天线端口是两个或两个以上的DMRS天线端口。
第一，N个DMRS天线端口用于PDCCH传输，可以记为PDCCH DMRS天线端口。也就是说，PDCCH支持多天线端口。
第二，N个DMRS天线端口中任意两个DMRS天线端口之间通过以下至少一项进行正交复用：TDM，FDM，或CDM。
例如，N个DMRS天线端口中任意两个DMRS天线端口之间通过CDM进行正交复用。再如，N个DMRS天线端口中任意两个DMRS天线端口之间通过CDM和FDM进行正交复用。
接下来，通过两种实施方式(下述第一种实施方式、第二种实施方式)进行介绍：
第一种实施方式，PDCCH的数据信息和PDCCH的DMRS之间FDM。
首先，对PDCCH的DMRS开销进行介绍：
在第一种实施方式中，第一PDCCH的传输资源包括多个REG，多个REG中每个REG包括M个第一RE，M个第一RE用于承载PDCCH的DMRS，M为大于3的正整数。其中，多个REG中每个REG包括时域上1个OFDM符号和频域上1个RB，详见名词解释部分的介绍，不再赘述。
应理解，在本申请中，每个REG包括多个RE(如12个RE)，在多个RE中，用于承载PDCCH DMRS的RE，描述为：第一RE。针对每个REG而言，除了M个第一RE之外，还可以包括其他RE，如承载PDCCH的数据信息的RE。
由于本申请考虑DMRS天线端口在频域使用正交掩码(orthogonal cover code，OCC)，而OCC的长度一般为偶数，所以，在本申请中，一个REG中用于承载DMRS的RE个数为偶数，且综合考虑DMRS的开销和DMRS的性能，优先考虑DMRS开销为1/3，即M＝4。换言之，每个REG中的4个第一RE用于承载该PDCCH的DMRS。
以图6为例，图6示出了一个REG上PDCCH的数据信息和DMRS分布状况。用于承载数据信息的RE，如空白方格所示。用于承载DMRS的RE，如斜线填充的方格所示。
应理解，M也可以为其他值，如M＝6，本申请对此不作限定。
需要指出的是，OCC的含义介绍如下：
PDCCH的DMRS使用伪随机序列进行发送，在所述伪随机序列基础上可以继续叠加正交序列，来支持多个正交的DMRS天线端口。所述伪随机序列可称之为基序列，所述正交序列称之为OCC。其中，OCC也可以有其他描述，如OCC序列，本申请对此不作限定。
其中，OCC包括时域OCC和频域OCC。时域OCC，可以理解为：在时域维度上使用OCC，可以记为TD-OCC，即time domain-OCC。频域OCC，可以理解为：在频域维度上使用OCC，可以记为FD-OCC，即frequency domain-OCC。
需要指出的是，OCC的长度介绍如下：
对于长度为2的OCC，可以理解为：该OCC有两个元素。例如，所述长度为2的OCC可以为包括表1中的序列：
表1
对于长度为4的OCC，可以理解为：该OCC有四个元素。例如，所述长度为4的OCC可以为包括表2中的序列：
表2
在本申请中，长度为2的时域OCC，可以记为：2长TD-OCC。长度为4的时域OCC，可以记为：4长TD-OCC。长度为2的频域OCC，可以记为：2长FD-OCC。长度为4的频域OCC，可以记为：4长FD-OCC。
在第一种实施方式中，作为第一种选项(option1)：N个DMRS天线端口中任意两个DMRS天线端口之间通过CDM进行正交复用。例如，N个DMRS天线端口中任意两个DMRS天线端口关联(或使用)不同的频域OCC和/或不同的时域OCC。换言之，N个DMRS天线端口关联(或使用)相同的时频资源，而通过关联(或使用)不同的时域OCC和/或不同的频域OCC保持正交。
例如，N个DMRS天线端口中任意两个DMRS天线端口关联(或使用)不同的频域OCC。根据关联(或使用)的频域OCC的长度，可以有如下示例(即下述示例1-2)：
示例1，关联长度为2的频域OCC：
由于某一个REG中有4个第一RE用于承载DMRS(即4个DMRS RE)，因此，对于同一个DMRS天线端口，前两个DMRS RE和后两个DMRS RE均关联同一个长度为2的OCC。此种情况下，共支持2个DMRS天线端口，即N＝2。
如图7所示，图7中的每个小方格代表一个RE。N个DMRS天线端口分别记为DMRS天线端口0和DMRS天线端口1。图7中DMRS天线端口0和DMRS天线端口1关联不同的频域OCC保持正交。
在图7中，字母a所在的方框示出了DMRS天线端口0关联的频域OCC。其中，DMRS天线端口0关联的频域OCC为[+1，+1]。
在图7中，字母b所在的方框示出了DMRS天线端口1关联的频域OCC。其中，DMRS天线端口1关联的频域OCC为[+1，-1]。
需要指出的是，在图7中，字母a所在的方框和字母b所在的方框实际对应的是同一时频资源。为了方便介绍，给出了在同一时频资源中，不同DMRS天线端口是如何进行码分复用。
示例2，关联长度为4的频域OCC：
由于某一个REG中有4个第一RE用于承载DMRS(即4个DMRS RE)，因此，对于同一个DMRS天线端口，4个DMRS RE恰好关联一个长度为4的OCC，如图8所示。此种情况下，共支持4个DMRS天线端口，N＝4。
具体地，4个DMRS天线端口分别记为：DMRS天线端口0-DMRS天线端口3。4个DMRS天线端口关联不同的频域OCC保持正交。
比如，DMRS天线端口0关联的频域OCC为[+1，+1，+1，+1]。DMRS天线端口1关联的频域OCC为[+1，-1，+1，-1]。DMRS天线端口2关联的频域OCC为[+1，+1，-1，-1]。DMRS天线端口3关联的频域OCC为[+1，-1，-1，+1]。
应理解，针对上述示例1，在PDCCH的时域符号为偶数(如2、4)的情况下，上述频域OCC，也可以替换为：时域OCC。针对上述示例2，在PDCCH的时域符号为偶数(如4)的情况下，上述频域OCC，也可以替换为：时域OCC。
再如，N个DMRS天线端口中任意两个DMRS天线端口之间通过不同的频域OCC和时域OCC进行正交复用。根据关联(或使用)的频域OCC的长度，可以有如下实施方式(即下述示例3-6)：
示例3，关联长度为2的频域OCC，以及长度为2的时域OCC：
N个DMRS天线端口中每个DMRS天线端口关联长度为2的时域OCC和长度为2的频域OCC进行加权处理。此种情况下，共支持4个DMRS天线端口，即N＝4。例如，在PDCCH的时域符号为2的情况下，不同DMRS天线端口关联的时域OCC和频域OCC，如图9所示。再如，在PDCCH的时域符号为4的情况下，不同DMRS天线端口关联的时域OCC和频域OCC，如图10所示。
具体地，4个DMRS天线端口分别记为DMRS天线端口0-DMRS天线端口3。4个DMRS天线端口关联长度为2的频域OCC和长度为2的时域OCC保持正交。
比如，DMRS天线端口0关联的时域OCC为[+1，+1]，DMRS天线端口0关联的频域OCC为[+1，+1]。DMRS天线端口1关联的时域OCC为[+1，-1]，DMRS天线端口0关联的频域OCC为[+1，+1]。DMRS天线端口2关联的时域OCC为[+1，+1]，DMRS天线端口2关联的频域OCC为[+1，-1]。DMRS天线端口3关联的时域OCC为[+1，-1]，DMRS天线端口3关联的频域OCC为[+1，-1]。
示例4，关联长度为4的频域OCC，以及长度为2的时域OCC：
N个DMRS天线端口中每个DMRS天线端口关联长度为2的时域OCC和长度为4的频域OCC进行加权处理。此种情况下，共支持8个DMRS天线端口，即N＝8。例如，在PDCCH的时域符号为2的情况下，不同DMRS天线端口关联的时域OCC和频域OCC，如图11所示。再如，在PDCCH的时域符号为4的情况下，不同DMRS天线端口关联的时域OCC和频域OCC，如图12所示。
具体地，8个DMRS天线端口分别记为DMRS天线端口0-DMRS天线端口7。8个DMRS天线端口关联长度为4的频域OCC和长度为2的时域OCC保持正交。
比如，DMRS天线端口0关联的时域OCC为[+1，+1]，DMRS天线端口0关联的频域OCC为[+1，+1，+1，+1]。DMRS天线端口1关联的时域OCC为[+1，-1]，DMRS天线端口1关联的频域OCC为[+1，+1，+1，+1]。DMRS天线端口2关联的时域OCC为[+1，+1]，DMRS天线端口2关联的频域OCC为[+1，-1，+1，-1]。DMRS天线端口3关联的时域OCC为[+1，-1]，DMRS天线端口3关联的频域OCC为[+1，-1，+1，-1]。DMRS天线端口4关联的时域OCC为[+1，+1]，DMRS天线端口4关联的频域OCC为[+1，+1，-1，-1]。DMRS天线端口5关联的时域OCC为[+1，-1]，DMRS天线端口5关联的频域OCC为[+1，+1，-1，-1]。DMRS天线端口6关联的时域OCC为[+1，+1]，DMRS天线端口6关联的频域OCC为[+1，-1，-1，+1]。DMRS天线端口7关联的时域OCC为[+1，-1]，DMRS天线端口7关联的频域OCC为[+1，-1，-1，+1]。
示例5，关联长度为2的频域OCC，以及长度为4的时域OCC：
N个DMRS天线端口中每个DMRS天线端口关联长度为2的频域OCC和长度为4的时域OCC进行加权处理。此种情况下，共支持8个DMRS天线端口，即N＝8。例如，在PDCCH的时域符号为4的情况下，不同DMRS天线端口关联的频域OCC和时域OCC，如图13所示。
具体地，8个DMRS天线端口分别记为DMRS天线端口0-DMRS天线端口7。8个DMRS天线端口关联长度为4的时域OCC和长度为2的频域OCC保持正交。
比如，DMRS天线端口0关联的频域OCC为[+1，+1]，DMRS天线端口0关联的时域OCC为[+1，+1，+1，+1]。DMRS天线端口1关联的频域OCC为[+1，-1]，DMRS天线端口1关联的时域OCC为[+1，+1，+1，+1]。DMRS天线端口2关联的频域OCC为[+1，+1]，DMRS天线端口2关联的时域OCC为[+1，-1，+1，-1]。DMRS天线端口3关联的频域OCC为[+1，-1]，DMRS天线端口3关联的时域OCC为[+1，-1，+1，-1]。DMRS天线端口4关联的频域OCC为[+1，+1]，DMRS天线端口4关联的时域OCC为[+1，+1，-1，-1]。DMRS天线端口5关联的频域OCC为[+1，-1]，DMRS天线端口5关联的时域OCC为[+1，+1，-1，-1]。DMRS天线端口6关联的频域OCC为[+1，+1]，DMRS天线端口6关联的时域OCC为[+1，-1，-1，+1]。DMRS天线端口7关联的频域OCC为[+1，-1]，DMRS天线端口7关联的时域OCC为[+1，-1，-1，+1]。
示例6，关联长度为4的频域OCC，以及长度为4的时域OCC：
N个DMRS天线端口中每个DMRS天线端口关联长度为4的频域OCC和长度为4的时域OCC进行加权处理。此种情况下，共支持16个DMRS天线端口，即N＝16。例如，在PDCCH的时域符号为4的情况下，不同DMRS天线端口关联的频域OCC和时域OCC，如图14所示。
具体地，16个DMRS天线端口分别记为DMRS天线端口0-DMRS天线端口15。16个DMRS天线端口关联长度为4的时域OCC和长度为4的频域OCC保持正交。
在第一种实施方式中，作为第二种选项(option2)：N个DMRS天线端口中任意两个DMRS天线端口之间通过CDM和/或FDM进行正交复用。例如，N个DMRS天线端口属于至少两个CDM组，至少两个CDM组中每个CDM组包括N个DMRS天线端口中的一部分天线端口。至少两个CDM组中任意一个CDM组中的任意两个DMRS天线端口关联不同的频域OCC和/或不同的时域OCC。至少两个CDM组中的任意两个CDM组所包括的DMRS天线端口关联不同的频域资源。
需要指出的是，在本申请中，占用相同的时频资源而关联时域OCC和/或频域OCC保持正交的DMRS天线端口属于一个CDM组，占用不同时频资源的DMRS天线端口属于不同的CDM组。其中，不同CDM 组所包括的DMRS天线端口数量，可以相同，也可以不同。接下来，以不同CDM组所包括的DMRS天线端口数量相同为例，进行介绍，不应理解为对本申请的限定。
在本申请中，每个REG中的4个DMRS RE可以划分为2个CDM组(CDM group)，每个CDM组包括2个DMRS RE，如图15中‘a1’和‘b1’所在方框所示。
优选地，以2个CDM组为例，考虑通过关联不同频域OCC保持同一CDM组的不同DMRS天线端口之间正交。具体地，每个CDM组可以关联长度为2的频域OCC，如图15中‘a2’和‘b2’所在方框所示。此种情况下，每个CDM组包含2个DMRS天线端口，2个CDM组共支持4个DMRS天线端口。即N＝4。
优选地，以2个CDM组为例，考虑通过关联不同时域OCC保持同一CDM组的不同DMRS天线端口之间正交。具体地，在PDCCH的时域符号为2的情况下，每个CDM组可以关联长度为2的时域OCC，如图15中‘a3’和‘b3’所在方框所示。此种情况下，每个CDM组包含2个DMRS天线端口，2个CDM组共支持4个DMRS天线端口。即N＝4。
优选地，以2个CDM组为例，考虑通过关联不同时域OCC和频域OCC保持同一CDM组的不同DMRS天线端口之间正交。具体地，在PDCCH的时域符号为2的情况下，每个CDM组可以关联长度为2的时域OCC和长度为2的频域OCC，如图15中‘a4’和‘b4’所在方框所示。此种情况下，共支持8个DMRS天线端口。即N＝8。
容易理解的是，在每个CDM组内，不同DMRS天线端口关联的时域OCC与频域OCC，可以参见‘第一种实施方式的第一种选项’的介绍，不再赘述。
第二种实施方式，PDCCH的数据信息和PDCCH的DMRS之间TDM。例如，PDCCH的时域资源包括K个符号，K个符号包括第一符号和第二符号。其中，PDCCH的数据信息占用第一符号，PDCCH的DMRS占用第二符号。K为大于或等于2的正整数。
以图16为例，K＝2，PDCCH的数据信息占用第一符号，如空白方格所示。PDCCH的DMRS占用第二符号，如有填充的方格所示。当然，PDCCH的DMRS也可以占用更多的符号，如2个符号、4个符号等，本申请对此不作限定。
在第二种实施方式中，作为第一种选项(option1)：N个DMRS天线端口中任意两个DMRS天线端口之间通过CDM进行正交复用。例如，N个DMRS天线端口中任意两个DMRS天线端口关联或者使用不同的频域OCC和/或不同的时域OCC。换言之，N个DMRS天线端口占用相同的时频资源，且通过关联不同的时域OCC和/或不同的频域OCC保持正交。
例如，N个DMRS天线端口中任意两个DMRS天线端口关联或者使用不同的频域OCC。根据关联的频域OCC的长度，可以有如下示例：
每个DMRS天线端口可以关联长度为2的频域OCC，如图16中‘a1’所在方框所示。此种情况下，共支持2个DMRS天线端口。即N＝2。
每个DMRS天线端口可以关联长度为4的频域OCC，如图16中‘a2’所在方框所示。此种情况下，共支持4个DMRS天线端口。即N＝4。
再如，N个DMRS天线端口中任意两个DMRS天线端口关联或者使用不同的时域OCC。根据关联的时域OCC的长度，可以有如下示例：
在PDCCH的DMRS时域符号为偶数(如2、4)的情况下，每个DMRS天线端口可以关联长度为2的时域OCC。此种情况下，共支持2个DMRS天线端口。即N＝2。
在PDCCH的DMRS时域符号为偶数(如4)的情况下，每个DMRS天线端口可以关联长度为4的时域OCC。此种情况下，共支持4个DMRS天线端口。即N＝4。
在第二种实施方式中，作为第二种选项(option2)：N个DMRS天线端口中任意两个DMRS天线端口之间通过CDM和/或FDM进行正交复用。例如，N个DMRS天线端口属于至少两个CDM组，至少两个CDM组中每个CDM组包括N个DMRS天线端口中的一部分天线端口。至少两个CDM组中任意一个CDM组中的任意两个DMRS天线端口关联或者使用不同的频域OCC和/或不同的时域OCC。至少两个CDM组中的任意两个CDM组所包括的DMRS天线端口关联不同的频域资源。
以3个CDM组为例，每个CDM组中的DMRS天线端口可以分别包括4个RE，考虑通过关联不同频域OCC保持同一CDM组的不同DMRS天线端口之间正交。每个CDM组可以关联长度为2的频域OCC，如图16中‘b1’所在方框所示。此种情况下，共支持6个DMRS天线端口。即N＝6。
以3个CDM组为例，每个CDM组中的DMRS天线端口可以分别包括4个RE，考虑通过关联不同频 域OCC保持同一CDM组的不同DMRS天线端口之间正交。每个CDM组可以关联长度为4的频域OCC，如图16中‘b2’所在方框所示。此种情况下，共支持12个DMRS天线端口。即N＝12。
以2个CDM组为例，每个CDM组中的DMRS天线端口可以分别包括6个RE，考虑通过关联不同频域OCC保持同一CDM组的不同DMRS天线端口之间正交。每个CDM组可以关联长度为2的频域OCC，如图16中‘c2’所在方框所示。此种情况下，共支持4个DMRS天线端口。即N＝4。
以2个CDM组为例，在PDCCH的DMRS时域符号为偶数(如2、4)的情况下，每个DMRS天线端口可以关联长度为2的时域OCC，且关联长度为2的频域OCC。此种情况下，共支持8个DMRS天线端口。即N＝8。
在第二种实施方式中，作为第三种选项(option3)：N个DMRS天线端口中任意两个DMRS天线端口之间通过FDM进行正交复用。例如，N个DMRS天线端口中的任意两个DMRS天线端口关联或者使用不同的频域资源。例如，N＝3，DMRS天线端口0占用4个RE，如每个REG的第1/2/7/8个RE。DMRS天线端口1占用4个RE，如每个REG的第3/4/9/10个RE。DMRS天线端口2占用4个RE，如每个REG的第5/6/11/12个RE。
应理解，上述两种实施方式(即上述第一种实施方式、第二种实施方式)，为示例性介绍N个DMRS天线端口，不应理解为对本申请的限定。当然，可能还有更多的组合情况，在不同的组合情况下，N可能有其他取值，比如，N的取值包括2T或3*Q，T和Q为正整数。
对于网络设备而言，网络设备确定L个DMRS天线端口之后，执行S502：
S502、网络设备通过L个DMRS天线端口向第一终端设备发送第一PDCCH。相应的，第一终端设备通过L个DMRS天线端口接收来自网络设备的第一PDCCH。
其中，第一终端设备的介绍如下：
该步骤可以由第一终端设备执行，在并不特殊说明的情况下，本申请中的“第一终端设备”既可以指所述第一终端设备本身，也可以是所述第一终端设备中的组件(例如，处理器、芯片、或芯片系统等)，或者也可以是能实现全部或部分第一终端设备功能的逻辑模块或软件。
其中，L个DMRS天线端口，可以参见S501的介绍，不再赘述。
其中，第一PDCCH的介绍如下：
第一PDCCH包括两部分，即第一PDCCH的数据信息和第一PDCCH的DMRS。
应理解，针对第一PDCCH的DMRS，网络设备通过L个DMRS天线端口向第一终端设备发送第一PDCCH的DMRS，包括：网络设备通过L个DMRS天线端口所关联的时域资源、频域资源、或OCC中的至少一项，以及L个DMRS天线端口，向第一终端设备发送第一PDCCH的DMRS。
针对第一PDCCH的数据信息，网络设备通过L个DMRS天线端口向第一终端设备发送第一PDCCH的数据信息，仅是指：网络设备通过发送第一PDCCH的DMRS的所述L个天线端口，向第一终端设备发送第一PDCCH的数据信息，而并非要使用所述L个DMRS天线端口所关联的时域资源、频域资源和OCC中的任意一项，向第一终端设备发送第一PDCCH的数据信息。
应理解，在网络设备执行S502的情况下，上述两种实施方式(即第一种实施方式、第二种实施方式)中涉及的PDCCH，可以替换为：第一PDCCH。
容易理解的是，对于第一终端设备而言，如图17所示，第一终端设备执行S502之前，还执行S503：
S503、第一终端设备确定L个DMRS天线端口。
其中，L个DMRS天线端口，可以参见S501的介绍，不再赘述。
其中，结合两种实施方案(下述第一种实施方案、第二种实施方案)，对S503进行介绍：
第一种实施方案：本申请通信方法包括如下步骤：
S503a、网络设备向第一终端设备发送第一信息。相应的，第一终端设备接收来自网络设备的第一信息。
其中，第一信息的介绍如下：
第一信息指示上述L个DMRS天线端口，如第一信息包括上述L个DMRS天线端口的端口号。
一种可能的实施方式，第一信息以终端设备粒度指示DMRS天线端口，即：第一信息指示第一终端设备在第一SS set上使用L个DMRS天线端口检测第一PDCCH。其中，第一SS set是第一终端设备的所有CORESET所关联的所有SS set。
可以理解为：第一终端设备的所有PDCCH传输均采用上述L个DMRS天线端口。换言之，第一终端 设备采用上述L个DMRS天线端口在自身配置的任一个CORESET所关联的任一个SS set上监测PDCCH。
一种可能的实施方式，第一信息以BWP粒度指示DMRS天线端口，即：第一信息指示第一终端设备在第二SS set上使用L个DMRS天线端口检测第一PDCCH。其中，第二SS set是第一BWP上的所有CORESET所关联的所有SS set，第一BWP是第一终端设备的所有BWP中的一个BWP。
可以理解为：第一终端设备在同一个BWP(如上述第一BWP)上的所有PDCCH传输均采用上述L个DMRS天线端口，不同BWP上的PDCCH传输采用的DMRS天线端口是独立配置的，可以相同，也可以不同。换言之，第一终端设备使用上述L个DMRS天线端口在第一BWP所关联的所有CORESET(s)所关联的所有SS set(s)上监测PDCCH。
一种可能的实施方式，第一信息以CORESET粒度指示DMRS天线端口，即：第一信息指示第一终端设备在第三SS set上使用L个DMRS天线端口检测第一PDCCH。其中，第三SS set是第一SS set是在第一CORESET所关联的所有SS set，第一CORESET是第一终端设备的所有CORESET中的一个CORESET。
可以理解为：第一终端设备使用同一个CORESET进行的所有PDCCH传输均采用上述L个DMRS天线端口，不同CORESET上进行的PDCCH传输采用的DMRS天线端口是独立配置的，可以相同，也可以不同。换言之，第一终端设备使用上述L个DMRS天线端口在第一CORESET关联的所有SS set(s)上监测PDCCH。
一种可能的实施方式，第一信息以CORESET组粒度指示DMRS天线端口，即：第一信息指示第一终端设备在第四SS set上使用L个DMRS天线端口检测第一PDCCH。其中，第四SS set是第一CORESET组所关联的所有SS set，第一CORESET组是第一终端设备的所有CORESET组中的一个CORESET组，每个CORESET组包括一个或者多个CORESET。
可以理解为：第一终端设备使用同一个CORESET组进行的所有PDCCH传输均采用上述L个DMRS天线端口，不同CORESET组上进行的PDCCH传输采用的DMRS天线端口是独立配置的，可以相同，也可以不同。换言之，第一终端设备使用上述L个DMRS天线端口在第一CORESET组关联的所有SS set(s)上监测PDCCH。
一种可能的实施方式，第一信息以SS set粒度指示DMRS天线端口，即：第一信息指示第一终端设备在第五SS set上使用L个DMRS天线端口检测第一PDCCH。其中，第五SS set是第一终端设备的所有SS set中的一个SS set。
可以理解为：第一终端设备使用同一个SS set(如上述第五SS set)进行的所有PDCCH传输均采用上述L个DMRS天线端口。第一终端设备在不同SS set上进行的PDCCH传输采用的DMRS ports是独立配置的，可以相同，也可以不同。换言之，第一终端设备采用上述L个DMRS天线端口在第五SS set上监测PDCCH。
一种可能的实施方式，第一信息以SS set组粒度指示DMRS天线端口，即：第一信息指示第一终端设备在第一SS set组上使用L个DMRS天线端口检测第一PDCCH。其中，第一SS set组是第一终端设备的所有SS set组中的一个SS set组。每个SS set组包括一个或多个SS set。
可以理解为：第一终端设备使用同一个SS set组(如上述第一SS set组)进行的所有PDCCH传输均采用上述L个DMRS天线端口。第一终端设备在不同SS set组上进行的PDCCH传输采用的DMRS ports是独立配置的，可以相同，也可以不同。换言之，第一终端设备采用上述L个DMRS天线端口在第一SS set组上监测PDCCH。
其中，第一信息可以承载于以下至少一项：
无线资源控制(radio resource control，RRC)信令、系统广播信息块(system information block，SIB)、多媒体接入控制层控制单元(media access control control element，MAC CE)、或下行控制信息(downlink control information，DCI)等。
一种可能的实施方式，对应于第一信息承载于DCI的情况，该DCI对应第一终端设备组。其中，第一终端设备组包括至少一个终端设备。第一信息承载于该DCI的第一信息块，其中，第一信息块对应第一终端设备组中的一个或多个终端设备，所述一个或多个终端设备包括第一终端设备。以图18为例，承载第一信息的DCI，可以是终端设备组公共DCI，如UE group common DCI，专用于指示一个终端设备组(如上述第一终端设备组)中的每个终端设备所使用的L个DMRS天线端口。示例性地，承载第一信息的DCI包括X个信息块(blocks)，每个信息块占用的比特数大于或等于1，每个信息块与一个或者多个 终端设备对应，从而指示所对应的终端设备的PDCCH DMRS天线端口。X为大于或等于1的正整数。
以图18为例，第一信息承载于第一信息块，从而为第一终端设备指示上述L个DMRS天线端口。比如，第一PDCCH传输第二DCI的情况下，第一DCI的第一信息块指示监测第一PDCCH使用的DMRS天线端口。
第二种实施方式：本申请通信方法包括如下步骤：
S503b、第一终端设备根据第二信息确定L个DMRS天线端口。
其中，结合以下三个可能的实施方式，对第二信息进行介绍：
一种可能的实施方式，第二信息包括第一终端设备的无线网络临时标识(radio network tempory identity，RNTI)，如小区无线网络临时标识(cell radio network tempory identity，C-RNTI)。也就是说，上述L个DMRS天线端口是根据第一终端设备的RNTI确定的。
例如，当L＝1时，所述L个DMRS天线端口的编号满足：nRNTImod N，其中，nRNTI表示第一终端设备的RNTI的值，mod为取模操作。
再如，当L>1时，所述L个DMRS天线端口中某一个DMRS天线端口的编号满足：nRNTImod N，其中，nRNTI表示第一终端设备的RNTI的值，mod为取模操作。例如，上述公式(即nRNTImod N)定义了所述L个DMRS天线端口中第一个DMRS天线端口的编号，其余L-1个DMRS天线端口的编号依次增大，如所述L个DMRS天线端口中第M个DMRS天线端口的编号满足：(nRNTImod N+M-1)mod N。
一种可能的实施方式，第二信息包括第一终端设备的RNTI和第一时间单元的编号。也就是说，上述L个DMRS天线端口是根据第一终端设备的RNTI和第一时间单元的编号确定的。
例如，当L＝1时，L个DMRS天线端口的编号满足：Y-1＝nRNTI，其中，nRNTI表示第一终端设备的RNTI的值，表示第一时间单元的编号，A和D为正整数，mod为取模操作。示例性地，A可以取值{39827,39829,39839}中的某一个，D＝65537。
再如，当L>1时，所述L个DMRS天线端口中某一个DMRS天线端口的编号满足： Y-1＝nRNTI，其中，nRNTI表示第一终端设备的RNTI的值，表示第一时间单元的编号，A和D为正整数，mod为取模操作。例如，上述公式定义了所述L个DMRS天线端口中第一个DMRS天线端口的编号，其余L-1个DMRS天线端口的编号依次增大，如所述L个DMRS天线端口中第M个DMRS天线端口的编号满足：
其中，第一时间单元，可以理解为：第一终端设备检测第一PDCCH的时间单元。比如，第一终端设备在第一时间单元上通过上述L个DMRS天线端口，接收第一PDCCH。也就是说，L个DMRS天线端口是第一终端设备在第一时间单元上使用的DMRS天线端口。
如此一来，由于第一终端设备在不同时刻采用的时间单元编号不同，所以，第一终端设备在不同时刻确定的DMRS天线端口也不一样，从而降低了‘DMRS天线端口冲突’的概率。
一种可能的实施方式，第二信息包括第一终端设备的RNTI和第一时间单元的编号以及第一CORESET的编号。也就是说，上述L个DMRS天线端口是根据第一终端设备的RNTI和第一时间单元的编号以及第一CORESET的编号确定的。
例如，当L＝1时，L个DMRS天线端口的编号满足：Yp,-1＝nRNTI，其中，nRNTI表示第一终端设备的RNTI的值，表示第一时间单元的编号，p表示第一CORESET的编号，D为正整数，mod为取模操作。D＝65537。
其中，Ap是根据p确定的正整数。比如，将第一终端设备的所有CORESET划分为3个组，每个CORESET组内的PDCCH传输所使用的DMRS天线端口相同。此种情况下，Ap＝39827for pmod3＝0；Ap＝39829for pmod3＝1；Ap＝39839for pmod3＝2。
其中，Ap＝39827for pmod3＝0，可以理解为：在pmod3＝0的情况下，Ap＝39827。
其中，Ap＝39829for pmod3＝1，可以理解为：在pmod3＝1的情况下，Ap＝39829。
其中，Ap＝39839for pmod3＝2，可以理解为：在pmod3＝2的情况下，Ap＝39839。
再如，当L>1时，所述L个DMRS天线端口中某一个DMRS天线端口的编号满足： Yp,-1＝nRNTI，其中，nRNTI表示第一终端设备的RNTI的值，表示第一时间单元的编号，p表示第一CORESET的编号，D为正整数，mod为取模操作。D＝65537。例如，上述公式定义了所述L个DMRS天线端口中第一个DMRS天线端口的编号，其余L-1个DMRS天线端口的编号依次增大，如所述L个DMRS天线端口中第M个DMRS天线端口的编号满足：
其中，第一时间单元，可以参见示例2的介绍，不再赘述。
其中，第一CORESET，可以理解为：第一终端设备检测第一PDCCH所使用的CORESET。比如，第一终端设备在第一CORESET上通过上述L个DMRS天线端口，接收第一PDCCH。也就是说，L个DMRS天线端口是第一终端设备在第一CORESET上使用的DMRS天线端口。
如此一来，由于第一终端设备在不同时刻采用的时间单元编号不同，所以，第一终端设备在不同时刻确定的DMRS天线端口也不一样，和/或，由于不同CORESET的编号不同，所以，第一终端设备在不同CORESET检测PDCCH时，所确定的DMRS天线端口也可能不一样，从而进一步降低了‘DMRS天线端口冲突’的概率。
应理解，针对示例3，作为一种可能的替换方式，p表示第一SS set的编号，或p表示第一BWP的编号，或p表示第一终端设备的标识等，本申请对此不作限定。
需要补充的是，DMRS天线端口冲突，可以理解为，不同终端设备使用相同的DMRS天线端口接收PDCCH。比如，N＝8，第一终端设备的nRNTI＝1，第二终端设备的nRNTI＝9。此种情况下，第一终端设备基于示例1所确定的DMRS天线端口，与第二终端设备基于示例1所确定的DMRS天线端口相同，意味着，发生DMRS天线端口冲突。
在一些实施例中，如MU-MIMO传输场景下，如图19所示，本申请还包括如下步骤：
S511、网络设备从N个DMRS天线端口中确定L’个DMRS天线端口。
其中，网络设备和N个DMRS天线端口，可以参见S501的介绍，不再赘述。
其中，L’个DMRS天线端口中任意一个DMRS天线端口，与L个DMRS天线端口中任意一个DMRS天线端口不同。L’为小于或等于N的正整数。
S512、网络设备通过L’个DMRS天线端口向第二终端设备发送第二PDCCH。相应的，第二终端设备通过L’个DMRS天线端口接收来自网络设备的第二PDCCH。
其中，第二PDCCH包括第二PDCCH的数据信息和第二PDCCH的DMRS。
比如，针对第二PDCCH的DMRS，网络设备通过L’个DMRS天线端口所关联的时域资源、频域资源、或OCC中的至少一项，以及L’个DMRS天线端口，向第二终端设备发送第二PDCCH的DMRS，详见S502的介绍，不再赘述。
针对第二PDCCH的数据信息，网络设备通过发送第二PDCCH的DMRS的所述L’个天线端口，向第二终端设备发送第二PDCCH的数据信息，而并非要使用所述L’个DMRS天线端口所关联的时域资源、频域资源和OCC中的任意一项，向第二终端设备发送第二PDCCH的数据信息，详见S502的介绍，不再赘述。
需要指出的是，S511和S512是可选的步骤。比如，在L小于N的情况下，网络设备可以执行S511和S512。在L等于N的情况下，网络设备可以不执行S511和S512，从而有助于提升PDCCH解调性能。
可以理解的是，以上各个实施例中，由网络设备实现的方法和/或步骤，也可以由可用于该网络设备的部件(例如处理器、芯片、芯片系统、电路、逻辑模块、或软件)实现；由终端设备实现的方法和/或步骤，也可以由可用于该终端设备的部件(例如处理器、芯片、芯片系统、电路、逻辑模块、或软件)实现。其中，芯片系统可以由芯片构成，或者，芯片系统可以包括芯片和其他分立器件。
可以理解的是，该通信装置为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定 的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法实施例对通信装置进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要指出的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
图20示出了一种通信装置2000的结构示意图。该通信装置2000包括处理模块2001和收发模块2002。该通信装置2000可以用于实现上述网络设备或终端设备的功能。
在一些实施例中，该通信装置2000还可以包括存储模块(图20中未示出)，用于存储程序指令和数据。
在一些实施例中，收发模块2002，也可以称为收发单元用以实现发送和/或接收功能。该收发模块2002可以由收发电路、收发机、收发器或者通信接口构成。
在一些实施例中，收发模块2002，可以包括接收模块和发送模块，分别用于执行上述方法实施例中由网络设备或终端设备执行的接收和发送类的步骤，和/或用于支持本文所描述的技术的其它过程；处理模块2001，可以用于执行上述方法实施例中由网络设备或终端设备执行的处理类(例如确定等)的步骤，和/或用于支持本文所描述的技术的其它过程。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
可选地，本申请中，收发模块接收/发送信息，也可以理解为处理模块通过收发模块接收/发送信息。处理模块通过收发模块接收/发送信息，也可以理解为：处理模块控制收发模块接收/发送信息。或者，处理模块通过收发模块发送信息，可以理解为：处理模块向收发模块输出信息，由收发模块发送该信息；处理模块通过收发模块接收信息，可以理解为：收发模块接收信息，并向处理模块输入该信息。
在本申请中，该通信装置2000可以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定专用集成电路(application-specific integrated circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。
在一些实施例中，当图20中的通信装置2000是芯片或芯片系统时，收发模块2002的功能/实现过程可以通过芯片或芯片系统的输入输出接口(或通信接口)实现，处理模块2001的功能/实现过程可以通过芯片或芯片系统的处理器(或者处理电路)实现。
由于本实施例提供的通信装置2000可执行上述方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
作为一种可能的产品形态，本申请实施例所述的网络设备或终端设备，还可以使用下述来实现：一个或多个现场可编程门阵列(field programmable gate array，FPGA)、可编程逻辑器件(programmable logic device，PLD)、控制器、状态机、门逻辑、分立硬件部件、任何其它适合的电路、或者能够执行本申请通篇所描述的各种功能的电路的任意组合。
作为另一种可能的产品形态，本申请实施例所述的网络设备或终端设备，可以由一般性的总线体系结构来实现。为了便于说明，参见图21，图21是本申请实施例提供的通信装置2100的结构示意图，该通信装置2100包括处理器2101和收发器2102。该通信装置2100可以为网络设备，或其中的芯片或芯片系统；或者，该通信装置2100可以为终端设备，或其中的芯片或模块。图21仅示出了通信装置2100的主要部件。除处理器2101和收发器2102之外，所述通信装置2100还可以进一步包括存储器2103、以及输入输出装置(图未示意)。
可选地，处理器2101主要用于对通信协议以及通信数据进行处理，以及对整个通信装置进行控制，执行软件程序，处理软件程序的数据。存储器2103主要用于存储软件程序和数据。收发器2102可以包括射频电路和天线，射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
可选地，处理器2101、收发器2102、以及存储器2103可以通过通信总线连接。
需要指出的是，存储器2103可以独立于处理器2101存在，也可以和处理器2101集成在一起。存储器2103可以位于通信装置2100内，也可以位于通信装置2100外，不予限制。
当通信装置开机后，处理器2101可以读取存储器2103中的软件程序，解释并执行软件程序的指 令，处理软件程序的数据。当需要通过无线发送数据时，处理器2101对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到通信装置时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器2101，处理器2101将基带信号转换为数据并对该数据进行处理。
在另一种实现中，所述的射频电路和天线可以独立于进行基带处理的处理器而设置，例如在分布式场景中，射频电路和天线可以与独立于通信装置，呈拉远式的布置。
在一些实施例中，在硬件实现上，本领域的技术人员可以想到上述通信装置2000可以采用图21所示的通信装置2100的形式。
作为一种示例，图20中的处理模块2001的功能/实现过程可以通过图21所示的通信装置2100中的处理器2101调用存储器2103中存储的计算机执行指令来实现。图20中的收发模块2002的功能/实现过程可以通过图21所示的通信装置2100中的收发器2102来实现。
作为又一种可能的产品形态，本申请中的网络设备或终端设备可以采用图22所示的组成结构，或者包括图22所示的部件。图22为本申请提供的一种通信装置2200的组成示意图。
如图22所示，通信装置2200包括至少一个处理器2201。可选地，该通信装置还包括通信接口2202。
当涉及的程序指令在该至少一个处理器2201中执行时，可以使得该装置2200实现前述任一实施例所提供的方法及其中任一可能的设计。或者，该处理器2201通过逻辑电路或执行代码指令用于实现前述任一实施例所提供的方法及其中任一可能的设计。
通信接口2202，可以用于接收程序指令并传输至所述处理器，或者，通信接口2202可以用于通信装置2200与其他通信设备进行通信交互，比如交互控制信令和/或业务数据等。示例性的，该通信接口2202可以用于接收来自该通信装置2200之外的其它装置的信号并传输至该处理器2201或将来自该处理器2201的信号发送给该通信装置2200之外的其它通信装置。
可选地，该通信接口2202可以为代码和/或数据读写接口电路，或者，该通信接口2202可以为通信处理器与收发机之间的信号传输接口电路，或者为芯片的管脚。
可选地，该通信装置2200还可以包括至少一个存储器2203，该存储器2203可以用于存储所需的涉及的程序指令和/或数据。
需要指出的是，存储器2203可以独立于处理器2201存在，也可以和处理器2201集成在一起。存储器2203可以位于通信装置2200内，也可以位于通信装置2200外，不予限制。
可选地，该通信装置2200还可以包括供电电路2204，该供电电路2204可以用于为该处理器2201供电。该供电电路2204可以与处理器2201位于同一个芯片内，或者，位于处理器2201所在的芯片之外的另一个芯片内。
可选地，该通信装置2200还可以包括总线2205，该通信装置2200中的各个部分可以通过总线2205互联。
在一些实施例中，在硬件实现上，本领域的技术人员可以想到上述图20所示的通信装置2000可以采用图22所示的通信装置2200的形式。
作为一种示例，图20中的处理模块2001的功能/实现过程可以通过图22所示的通信装置2200中的处理器2201调用存储器2203中存储的计算机执行指令来实现。图20中的收发模块2002的功能/实现过程可以通过图22所示的通信装置2200中的通信接口2202来实现。
需要指出的是，图22所示的结构并不构成对网络设备或终端设备的具体限定。比如，在本申请另一些实施例中，网络设备或终端设备可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
可选地，本申请中的处理器可以为中央处理单元(central processing unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、或者分立硬件组件等。通用处理器可以是微处理器，或者该处理器也可以是任何常规的处理器等。
可选地，本申请中的存储器可以是易失性存储器或非易失性存储器，或者可以包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读 存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，RAM)可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic random access memory，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)、或者直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
可选地，本申请实施例所述的供电电路包括但不限于如下至少一个：供电线路，供电子系统、电源管理芯片、功耗管理处理器、或者功耗管理控制电路。
在一些实施例中，本申请实施例还提供一种通信装置，该通信装置包括处理器，用于实现上述任一方法实施例中的方法。
作为一种可能的实现方式，该通信装置还包括存储器。该存储器，用于保存必要的计算机程序和数据。该计算机程序可以包括指令，处理器可以调用存储器中存储的计算机程序中的指令以指令该通信装置执行上述任一方法实施例中的方法。当然，存储器也可以不在该通信装置中。
作为另一种可能的实现方式，该通信装置还包括接口电路，该接口电路为代码/数据读写接口电路，该接口电路用于接收计算机执行指令(计算机执行指令存储在存储器中，可能直接从存储器读取，或可能经过其他器件)并传输至该处理器。
作为又一种可能的实现方式，该通信装置还包括通信接口，该通信接口用于与该通信装置之外的模块通信。
可以理解的是，该通信装置可以是芯片或芯片系统，该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
本申请还提供了一种计算机可读存储介质，其上存储有计算机程序或指令，该计算机程序或指令被计算机执行时实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
本领域普通技术人员可以理解，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
可以理解，本申请中描述的系统、装置和方法也可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，即可以位于一个地方，或者也可以分布到多个网络单元上。作为单元显示的部件可以是或者也可以不是物理单元。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存 储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state drive，SSD))等。本申请实施例中,计算机可以包括前面所述的装置。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。

Claims (22)

  1. 一种通信方法，其特征在于，包括：
    从N个解调参考信号DMRS天线端口中确定L个DMRS天线端口，所述N个DMRS天线端口用于物理下行控制信道PDCCH传输，所述N个DMRS天线端口中任意两个DMRS天线端口之间通过以下至少一项进行正交复用：时分复用TDM，频分复用FDM，或码分复用CDM；N为大于或等于2的正整数，L为小于或等于N的正整数；
    通过所述L个DMRS天线端口发送第一PDCCH的DMRS。
  2. 根据权利要求1所述的方法，其特征在于，
    在所述N个DMRS天线端口中任意两个DMRS天线端口之间通过所述CDM进行正交复用的情况下，
    所述N个DMRS天线端口中任意两个DMRS天线端口之间关联不同的频域正交掩码OCC和/或不同的时域OCC。
  3. 根据权利要求1所述的方法，其特征在于，
    在所述N个DMRS天线端口中任意两个DMRS天线端口之间通过所述CDM和所述FDM进行正交复用的情况下，
    所述N个DMRS天线端口属于至少两个CDM组，所述至少两个CDM组中每个CDM组包括所述N个DMRS天线端口中的一部分天线端口；
    所述至少两个CDM组中任意一个CDM组中任意两个DMRS天线端口之间关联不同的频域OCC和/或不同的时域OCC；
    所述至少两个CDM组中任意两个CDM组之间关联不同的频域资源。
  4. 根据权利要求1-3中任一项所述的方法，其特征在于，
    所述第一PDCCH的传输资源包括多个资源单元组REG，所述多个REG中每个REG包括M个第一资源单元RE，所述M个第一RE用于承载PDCCH的DMRS，M为大于3的正整数；
    其中，所述多个REG中每个REG包括时域上1个正交频分复用OFDM符号和频域上1个资源块RB。
  5. 根据权利要求1-3中任一项所述的方法，其特征在于，
    所述第一PDCCH的时域资源包括K个符号，所述K个符号包括第一符号和第二符号；K为大于或等于2的正整数；
    所述第一PDCCH包括所述第一PDCCH的数据信息和所述第一PDCCH的DMRS；
    所述第一PDCCH的数据信息占用所述第一符号，所述第一PDCCH的DMRS占用所述第二符号。
  6. 根据权利要求2或3所述的方法，其特征在于，
    所述频域OCC的长度为2或者4，所述时域OCC的长度为2或者4。
  7. 根据权利要求1-6中任一项所述的方法，其特征在于，
    所述N的取值包括2T或3*Q，T和Q为正整数。
  8. 根据权利要求1-7中任一项所述的方法，其特征在于，所述方法还包括：
    发送第一信息；
    其中，所述第一信息指示所述L个天线端口；
    所述第一信息承载于以下其中之一：无线资源控制RRC信令，系统广播信息块SIB，下行控制信息DCI，或媒体接入控制层控制单元MAC CE。
  9. 根据权利要求8所述的方法，其特征在于，
    所述第一信息指示所述L个天线端口，包括：
    所述第一信息指示第一终端设备在第一搜索空间集合SS set上使用所述L个DMRS天线端口检测所述第一PDCCH；
    其中，所述第一SS set是所述第一终端设备的所有控制资源集合CORESET所关联的所有SS set；
    或者，所述第一SS set是第一带宽部分BWP上的所有CORESET所关联的所有SS set，所述第一BWP是所述第一终端设备的所有BWP中的一个BWP；
    或者，所述第一SS set是在第一CORESET所关联的所有SS set，所述第一CORESET是所述第一终端设备的所有CORESET中的一个CORESET；
    或者，所述第一SS set是所述第一终端设备的所有SS set中的一个SS set。
  10. 根据权利要求8所述的方法，其特征在于，
    所述第一信息指示所述L个天线端口，包括：
    所述第一信息指示第一终端设备在第一CORESET组所关联的所有SS set上使用所述L个DMRS天线端口检测所述第一PDCCH，所述第一CORESET组是所述第一终端设备的所有CORESET组中的一个CORESET组；
    或者，所述第一信息指示第一终端设备在第一SS set组上使用所述L个DMRS天线端口检测所述第一PDCCH，所述第一SS set组是所述第一终端设备的所有SS set组中的一个SS set组。
  11. 根据权利要求8-10中任一项所述的方法，其特征在于，
    所述DCI对应第一终端设备组，所述第一终端设备组包括至少一个终端设备；
    所述第一信息承载于所述DCI的第一信息块，所述第一信息块对应所述第一终端设备组中的一个或多个终端设备，所述一个或多个终端设备包括第一终端设备。
  12. 根据权利要求1-7中任一项所述的方法，其特征在于，
    所述L个DMRS天线端口是根据第一终端设备的无线网络临时标识RNTI确定的；或者，
    所述L个DMRS天线端口是根据第一终端设备的无线网络临时标识RNTI和第一时间单元的编号确定的，或者，
    所述L个DMRS天线端口是根据第一终端设备的无线网络临时标识RNTI和第一时间单元的编号以及第一CORESET的编号确定的。
  13. 根据权利要求12所述的方法，其特征在于，
    L＝1；
    所述L个DMRS天线端口的编号满足：nRNTImod N；其中，nRNTI表示所述RNTI的值；或者，
    所述L个DMRS天线端口的编号满足：Y-1＝nRNTI；其中，nRNTI表示所述RNTI的值，表示所述第一时间单元的编号，A和D为正整数；或者，
    所述L个DMRS天线端口的编号满足：Yp,-1＝nRNTI；其中，nRNTI表示所述RNTI的值，表示所述第一时间单元的编号，p表示所述第一CORESET的编号，D为正整数，Ap是根据p确定的正整数。
  14. 根据权利要求1-13中任一项所述的方法，其特征在于，所述方法还包括：
    从所述N个DMRS天线端口中确定L’个DMRS天线端口，所述L’个DMRS天线端口中任意一个DMRS天线端口与所述L个DMRS天线端口中任意一个DMRS天线端口不同；L’为小于或等于N的正整数；
    通过所述L’个DMRS天线端口发送第二PDCCH的DMRS，所述第二PDCCH与所述第一PDCCH不同。
  15. 一种通信方法，其特征在于，包括：
    确定L个解调参考信号DMRS天线端口，所述L个DMRS天线端口是N个DMRS天线端口中的一个或多个DMRS天线端口，所述N个DMRS天线端口用于物理下行控制信道PDCCH传输，所述N个DMRS天线端口中任意两个DMRS天线端口之间通过以下至少一项进行正交复用：时分复用TDM，频分复用FDM，或码分复用CDM；N为大于或等于2的正整数，L为小于或等于N的正整数；
    通过所述L个DMRS天线端口接收第一PDCCH的DMRS。
  16. 根据权利要求15所述的方法，其特征在于，所述方法还包括：
    接收第一信息；
    其中，所述第一信息指示所述L个天线端口；
    所述第一信息承载于以下其中之一：无线资源控制RRC信令，系统广播信息块SIB，下行控制信息DCI，或媒体接入控制层控制单元MAC CE。
  17. 一种通信装置，其特征在于，所述通信装置用于实现如权利要求1-14中任一项所述的方法。
  18. 根据权利要求17所述的通信装置，其特征在于，所述通信装置包括网络设备或芯片。
  19. 一种通信装置，其特征在于，所述通信装置用于实现如权利要求15或16所述的方法。
  20. 根据权利要求19所述的通信装置，其特征在于，所述通信装置包括终端设备或芯片。
  21. 一种计算机可读存储介质，存储有计算机程序或指令，其特征在于，当所述计算机程序或指令被执行时，使得如权利要求1-14中任一项所述的方法被实现，或者，使得如权利要求15或16所述的方法被实现。
  22. 一种计算机程序产品，其特征在于，当所述计算机程序产品被运行时，使得如权利要求1-14中任一项所述的方法被执行，或者，使得如权利要求15或16所述的方法被执行。
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