WO2023207782A1 - 通信方法与通信装置 - Google Patents

通信方法与通信装置 Download PDF

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Publication number
WO2023207782A1
WO2023207782A1 PCT/CN2023/089749 CN2023089749W WO2023207782A1 WO 2023207782 A1 WO2023207782 A1 WO 2023207782A1 CN 2023089749 W CN2023089749 W CN 2023089749W WO 2023207782 A1 WO2023207782 A1 WO 2023207782A1
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WIPO (PCT)
Prior art keywords
mapping
indication parameter
communication device
layer
indication
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PCT/CN2023/089749
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English (en)
French (fr)
Inventor
刘磊
毕晓艳
刘永
王婷
蒋成龙
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华为技术有限公司
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Publication of WO2023207782A1 publication Critical patent/WO2023207782A1/zh

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Classifications

    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the embodiments of the present application relate to the field of communication technology, and more specifically, to a communication method and a communication device.
  • MIMO Multiple-input multiple-output
  • 5G fifth generation
  • NR new radio
  • the size of the transmitting and receiving antennas of the MIMO system is constantly increasing.
  • the ever-increasing scale of transmitting and receiving antennas has greatly increased the number of transmission streams and terminal devices that the MIMO system can support, and the number of transmission streams for a single terminal device can also increase to dozens of streams.
  • the existing mapping relationship between codewords and layers cannot support such a high number of transmission streams. In other words, the existing mapping relationship between codewords and layers cannot meet the requirements of the MIMO system's gradually increasing scale of transmitting and receiving antennas.
  • Embodiments of the present application provide a communication method and communication device that can dynamically adjust and/or indicate the mapping of codewords to layers.
  • a terminal device can use different mappings of codewords to layers at different times.
  • different terminals Devices can use different codeword-to-layer mappings at the same time. Therefore, in scenarios where there is a large performance difference between streams between terminal devices or between streams at different times, different codewords can be used.
  • the mapping to layers can also support the transmission of more streams, so that the mapping of codewords to layers can meet the requirements of the gradually increasing transmit and receive antenna scale of MIMO systems.
  • a communication method including: a first communication device receiving a first indication parameter, the first indication parameter having a corresponding relationship with a mapping of a first codeword to a layer; the first communication device according to the first The indication parameter determines the mapping of the first codeword to the layer.
  • different first indication parameters correspond to different mappings of codewords to layers.
  • the first communication device receives different first indication parameters and determines the mapping of the corresponding first codewords to layers according to the received first indication parameters. Mapping, so that different mappings of codewords to layers can be flexibly used, which can make the mapping of codewords used by the first communication device to layers in flexible adjustment, so that the mapping of codewords used by the first communication device to layers can be flexibly adjusted.
  • the mapping relationship can meet the requirements of the gradually increasing transmit and receive antenna scale of the MIMO system.
  • mapping of codewords to layers may include a mapping table of codewords to layers, or may include a specific row or column in the mapping table of codewords to layers. Therefore, the first indication parameter is the same as the first indication parameter.
  • a codeword to layer mapping tool A corresponding relationship can be understood as: there is a corresponding relationship between the first indication parameter and the mapping table of the first codeword to the layer, or it can also be understood as: the specific relationship between the first indication parameter and the mapping table of the first codeword to the layer.
  • a certain row or column has a corresponding relationship.
  • the embodiments of the present application do not limit the understanding of the corresponding relationship between the first indication parameter and the mapping of the first codeword to the layer.
  • the embodiments of the present application can dynamically adjust and/or indicate the mapping of codewords to layers.
  • a terminal device can use different mappings of codewords to layers at different times.
  • different terminal devices can use different mappings of codewords to layers at the same time.
  • Different codewords to layer mappings can be used at each time. Therefore, in scenarios where performance differences between streams between terminal devices are large or between streams at different times, different codewords can be used to map to layers.
  • Mapping can also support the transmission of more streams, so that the mapping of codewords to layers can meet the requirements of the gradually increasing transmit and receive antenna scale of MIMO systems.
  • the first indication parameter includes at least one of the following: channel characteristics, service characteristics, communication device capabilities, or scheduling information.
  • channel characteristics can characterize flow performance and differences between flows
  • service characteristics can characterize communication service requirements
  • communication device capabilities can characterize the processing capabilities of communication devices
  • scheduling information can characterize communication quality.
  • the above-mentioned first indication parameter has a significant impact on the mapping relationship between codewords and layers. In a scenario where the above-mentioned first indication parameter differs greatly between terminal devices or in a scenario where the above-mentioned first indication parameter differs greatly between different times, you can use Different codeword-to-layer mappings can improve communication capabilities.
  • the channel characteristics include at least one of the following: channel characteristic value threshold, signal-to-noise ratio threshold, number of antenna ports, scenario, location, channel path characteristics, channel delay Characteristics, or,spectrum.
  • the service characteristics include at least one of the following: coverage, mobility, time sensitivity, delay, or reliability.
  • Service types include at least one of the following: enhanced mobile communications, ultra-high reliability and ultra-low latency communications, or machine-type communications.
  • the communication device capability includes at least one of the following: a maximum number of codewords supported, a maximum number of layers supported, or whether to support dynamic mapping of codewords to layers. .
  • the scheduling information includes at least one of the following: modulation mode, code rate, transport block size, or layer identifier.
  • the method further includes: the first communication device sending a second indication parameter.
  • the terminal device reports the second indication parameter to the network device.
  • the second indication parameter may be the same as the first indication parameter, or may be different from the first indication parameter.
  • the embodiment of the present application can enable the network device to base the second indication parameter sent by the terminal device on The indication parameter determines the appropriate first indication parameter, and the second indication parameter reported by the terminal device to the network device can affect the network device's codeword-to-layer mapping decision during data transmission, and then the network device can determine the appropriate first indication parameter. , thereby improving communication performance.
  • the method further includes: the first communication device sending first indication information, the first indication information being used to indicate whether the first indication parameter is applicable or whether the first indication parameter is applicable. Indicates whether the parameter needs to be updated.
  • the terminal device feeds back to the network device whether the first indication parameter indicated by the network device is appropriate or necessary.
  • the embodiments of the present application can enable the network device to determine the appropriate first indication parameter based on the indication information sent by the terminal device, and the indication information reported by the terminal device to the network device can affect the code of the network device during data transmission. Word-to-layer mapping decisions are made, and then the network device can determine an appropriate first indication parameter, thereby improving communication performance.
  • the method further includes: the first communication device sending second indication information, the second indication information including the suggested indication parameters.
  • embodiments of the present application can enable the network device to determine the appropriate first indication parameter based on the suggested indication parameters sent by the terminal device, and the terminal device reports the suggested indication parameters to the network device. It can influence the codeword-to-layer mapping decision of the network device during data transmission, and then the network device can determine the appropriate first indication parameter, thereby improving communication performance.
  • the first communication device determines the mapping of the first codeword to the layer according to the first indication parameter, including: the first communication device determines according to the first indication parameter The corresponding relationship between the first indication parameter and the mapping of the first codeword to the layer; the first communication device is based on the first indication parameter and the relationship between the first indication parameter and the mapping of the first codeword to the layer. The corresponding relationship determines the mapping of the first codeword to the layer.
  • the first communication device determines the mapping of the first codeword to the layer according to the first indication parameter, including: the first communication device receives the first indication. The corresponding relationship between the parameter and the first indication parameter and the mapping of the first codeword to the layer; the first communication device is based on the first indication parameter and the mapping of the first indication parameter to the first codeword to the layer. The correspondence between them determines the mapping of the first codeword to the layer.
  • the first communication device determines the mapping of the first codeword to the layer according to the first indication parameter, including: the first communication device determines the mapping of the first codeword to the layer according to the first indication.
  • the corresponding relationship between the parameter and the first indication parameter and the mapping of the first codeword to the layer determines the mapping of the first codeword to the layer, wherein the first indication parameter and the mapping of the first codeword to the layer The correspondence between them is predefined.
  • the first communication device receiving the first indication parameter includes: the first communication device receiving the first indication parameter sent by the second communication device.
  • the mapping of codewords to layers is a mapping of codeword identifiers to layer identifiers, or a mapping of codeword numbers to layer numbers.
  • the indication information of the first indication parameter and the indication information of the correspondence between the first indication parameter and the mapping of the first codeword to the layer are user level indication information, user group level indication information, or cell level indication information.
  • the indication information of the first indication parameter is user-level indication information, user group-level indication information, or cell-level indication information.
  • the indication information of the correspondence between the first indication parameter and the mapping of the first codeword to a layer is user-level indication information, and user group-level indication information , or cell-level indication information.
  • the first indication parameter and/or the indication information of the correspondence relationship is high-layer signaling or physical layer signaling.
  • a communication method including: a second communication device determining a first indication parameter, the first indication parameter having a corresponding relationship with a mapping of a first codeword to a layer; the second communication device The device sends the first indication parameter.
  • the first indication parameter includes at least one of the following: channel characteristics, service characteristics, communication device capabilities, or scheduling information.
  • the channel characteristics include at least one of the following: channel characteristic value threshold, signal-to-noise ratio threshold, number of antenna ports, scene, location, channel path characteristics, channel delay Characteristics, or,spectrum.
  • the service characteristics include at least one of the following: coverage, mobility, time sensitivity, delay, or reliability.
  • Service types include at least one of the following: enhanced mobile communications, ultra-high reliability and ultra-low latency communications, or machine-type communications.
  • the communication device capability includes at least one of the following: a maximum supported number of codewords, a maximum supported number of layers, or whether to support dynamic mapping of codewords to layers. .
  • the scheduling information includes at least one of the following: modulation mode, code rate, transport block size, or layer identifier.
  • the method further includes: the second communication device sending the corresponding relationship to the first communication device.
  • the method further includes: the second communication device receiving a second indication parameter sent by the first communication device, and the second indication parameter and the second codeword are The mapping of layers has a corresponding relationship.
  • the method further includes: the second communication device receiving first indication information sent by the first communication device, the first indication information being used to indicate the first indication parameter. Whether it is applicable or whether the first indication parameter needs to be updated.
  • the method further includes: the second communication device receiving second indication information sent by the first communication device, where the second indication information includes the suggested indication parameters.
  • the mapping of codewords to layers is a mapping of codeword identifiers to layer identifiers, or a mapping of codeword numbers to layer numbers.
  • the indication information of the first indication parameter and the indication information of the correspondence between the first indication parameter and the mapping of the first codeword to the layer are user level indication information, user group level indication information, or cell level indication information.
  • the indication information of the first indication parameter is user-level indication information, user group-level indication information, or cell-level indication information.
  • the indication information of the correspondence between the first indication parameter and the mapping of the first codeword to the layer is user-level indication information, and user group-level indication information. , or cell-level indication information.
  • the first indication parameter and/or the indication information of the correspondence relationship is high-layer signaling, or physical layer signaling.
  • a communication device including: a transceiver unit, configured to receive a first indication parameter, which has a corresponding relationship with a mapping of a first codeword to a layer; and a processing unit, configured to receive the first indication parameter according to the The first indication parameter determines the mapping of the first codeword to the layer.
  • the first indication parameter includes at least one of the following: Channel characteristics, service characteristics, communication device capabilities, or scheduling information.
  • the channel characteristics include at least one of the following: channel characteristic value threshold, signal-to-noise ratio threshold, number of antenna ports, scene, location, channel path characteristics, channel delay Characteristics, or,spectrum.
  • the service characteristics include at least one of the following: coverage, mobility, time sensitivity, delay, or reliability.
  • Service types include at least one of the following: enhanced mobile communications, ultra-high reliability and ultra-low latency communications, or machine-type communications.
  • the communication device capability includes at least one of the following: a maximum number of codewords supported, a maximum number of layers supported, or whether to support dynamic mapping of codewords to layers. .
  • the scheduling information includes at least one of the following: modulation mode, code rate, transport block size, or layer identifier.
  • the transceiver unit is further configured to send a second indication parameter, where the second indication parameter has a corresponding relationship with the mapping of the second codeword to the layer.
  • the transceiver unit is further configured to send first indication information, the first indication information being used to indicate whether the first indication parameter is applicable or whether the first indication parameter Does it need to be updated?
  • the transceiver unit is further configured to send second indication information, where the second indication information includes suggested indication parameters.
  • the processing unit is configured to determine a correspondence between the first indication parameter and the mapping of the first codeword to a layer according to the first indication parameter; The processing unit is further configured to determine the mapping of the first codeword to the layer based on the first indication parameter and the corresponding relationship between the first indication parameter and the mapping of the first codeword to the layer.
  • the transceiver unit is configured to receive the correspondence between the first indication parameter and the mapping of the first codeword to the layer; the processing unit is also configured to The mapping of the first codeword to the layer is determined according to the first indication parameter and the corresponding relationship between the first indication parameter and the mapping of the first codeword to the layer.
  • the processing unit is further configured to perform a mapping according to the first indication parameter and the corresponding relationship between the first indication parameter and the mapping of the first codeword to the layer.
  • the mapping of the first codeword to the layer is determined, wherein the correspondence between the first indication parameter and the mapping of the first codeword to the layer is predefined.
  • the transceiver unit is also configured to receive the first indication parameter sent by the second communication device.
  • the mapping of codewords to layers is a mapping of codeword identifiers to layer identifiers, or a mapping of codeword numbers to layer numbers.
  • the indication information of the first indication parameter and the indication information of the correspondence between the first indication parameter and the mapping of the first codeword to the layer are user level indication information, user group level indication information, or cell level indication information.
  • the indication information of the first indication parameter is user-level indication information, user group-level indication information, or cell-level indication information.
  • the indication information of the correspondence between the first indication parameter and the mapping of the first codeword to the layer is user-level indication information, and user group-level indication information , or, cell level refers to display information.
  • the first indication parameter and/or the indication information of the correspondence relationship is high-layer signaling, or physical layer signaling.
  • a communication device including: a processing unit, configured to determine a first indication parameter, which has a corresponding relationship with the mapping of codewords to layers; and a transceiver unit, configured to send the first indication parameter to the first communication device. Send the first indication parameter.
  • the first indication parameter includes at least one of the following: channel characteristics, service characteristics, communication device capabilities, or scheduling information.
  • the channel characteristics include at least one of the following: channel characteristic value threshold, signal-to-noise ratio threshold, number of antenna ports, scenario, location, channel path characteristics, channel delay Characteristics, or,spectrum.
  • the service characteristics include at least one of the following: coverage, mobility, time sensitivity, delay, or reliability.
  • Service types include at least one of the following: enhanced mobile communications, ultra-high reliability and ultra-low latency communications, or machine-type communications.
  • the communication device capability includes at least one of the following: a maximum number of codewords supported, a maximum number of layers supported, or whether to support dynamic mapping of codewords to layers. .
  • the scheduling information includes at least one of the following: modulation mode, code rate, transport block size, or layer identifier.
  • the transceiver unit is also configured to send the corresponding relationship to the first communication device.
  • the transceiver unit is also configured to receive a second indication parameter sent by the first communication device, the second indication parameter and the mapping of the second codeword to the layer Have a corresponding relationship.
  • the transceiver unit is further configured to receive first indication information sent by the first communication device, where the first indication information is used to indicate whether the first indication parameter applicable or whether the first indication parameter needs to be updated.
  • the transceiver unit is further configured to receive second indication information sent by the first communication device, where the second indication information includes suggested indication parameters.
  • the mapping of codewords to layers is a mapping of codeword identifiers to layer identifiers, or a mapping of codeword numbers to layer numbers.
  • the indication information of the first indication parameter and the indication information of the correspondence between the first indication parameter and the mapping of the first codeword to the layer are user level indication information, user group level indication information, or cell level indication information.
  • the indication information of the first indication parameter is user-level indication information, user group-level indication information, or cell-level indication information.
  • the indication information of the correspondence between the first indication parameter and the mapping of the first codeword to the layer is user-level indication information, and user group-level indication information , or cell-level indication information.
  • the first indication parameter and/or the indication of the corresponding relationship The display information is high-level signaling or physical layer signaling.
  • a communication device including a processor, the processor is coupled to a memory, and the processor is used to execute a computer program or instructions, so that the communication device performs the first aspect and any of the possibilities of the first aspect.
  • a communication device including a logic circuit and an input-output interface.
  • the logic circuit is used to execute a computer program or instructions, so that the communication device executes the first aspect and any possible implementation of the first aspect.
  • a computer-readable storage medium including a computer program or an instruction.
  • the computer program or the instruction When the computer program or the instruction is run on a computer, it causes the computer to perform the first aspect and any of the possibilities of the first aspect. Implement the method described in any one of the ways; or, make the computer perform the method described in any one of the second aspect and any possible implementation of the second aspect.
  • An eighth aspect provides a computer program product that includes instructions that, when run on a computer, cause the computer to perform any one of the methods of the first aspect and any possible implementation of the first aspect. ; Or, causing the computer to perform the method described in any one of the second aspect and any possible implementation manner of the second aspect.
  • Figure 1 is a schematic diagram of a communication system architecture applicable to an embodiment of the present application.
  • Figure 2 is an interactive schematic diagram of the communication method in the embodiment of the present application.
  • Figure 3 is an interactive schematic diagram of a communication method in an embodiment of the present application.
  • Figure 4 is an interactive schematic diagram of yet another communication method in an embodiment of the present application.
  • Figure 5 is an interactive schematic diagram of another communication method in an embodiment of the present application.
  • Figure 6 is a schematic block diagram of a communication device 600 in an embodiment of the present application.
  • Figure 7 is a schematic block diagram of yet another communication device 700 in an embodiment of the present application.
  • FIG. 8 is a schematic block diagram of another communication device 800 in an embodiment of the present application.
  • GSM global system for mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • Wi-MAX microwave access
  • the satellite communication system includes satellite base stations and and terminal equipment.
  • the satellite base station provides communication services to terminal equipment.
  • Satellite base stations can also communicate with base stations. Satellites can serve as base stations and terminal equipment.
  • satellites can refer to unmanned aerial vehicles, hot air balloons, low-orbit satellites, medium-orbit satellites, high-orbit satellites, etc. Satellites can also refer to non-ground base stations or non-ground equipment.
  • the embodiments of this application are applicable to both homogeneous and heterogeneous network scenarios. At the same time, there are no restrictions on transmission points. They can be multi-point coordinated transmission between macro base stations and macro base stations, micro base stations and micro base stations, or macro base stations and micro base stations. , applicable to both FDD/TDD systems.
  • the embodiments of this application are applicable to both low-frequency scenarios (sub 6G) and high-frequency scenarios (above 6GHz), terahertz, optical communications, etc.
  • the embodiments of the present application are not only applicable to the communication between network devices and terminals, but also applicable to the communication between network devices and network devices, the communication between terminals, the Internet of Vehicles, the Internet of Things, the Industrial Internet, etc.
  • the terminal in the embodiment of this application may be a device with wireless transceiver function, which may specifically refer to user equipment (UE), access terminal, subscriber unit (subscriber unit), user station, or mobile station (mobile station). , remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device.
  • UE user equipment
  • access terminal subscriber unit (subscriber unit)
  • subscriber unit subscriber unit
  • user station or mobile station (mobile station).
  • remote station remote terminal, mobile device, user terminal, wireless communication device, user agent or user device.
  • the terminal device may also be a satellite phone, a cellular phone, a smartphone, a wireless data card, a wireless modem, a machine type communications device, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (wireless local) loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, vehicle-mounted equipment, communication equipment carried on high-altitude aircraft, wearable Equipment, drones, robots, terminals in device-to-device (D2D) communication, terminals in vehicle outreach (vehicle to everything, V2X), virtual reality (VR) terminal equipment, Augmented reality (AR) terminal equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, smart grid ), wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, or terminal equipment in communication networks evolved after 5G, etc. , the embodiments of this application are not limited.
  • the device used to implement the functions of the terminal device in the embodiment of the present application may be a terminal device; it may also be a device that can support the terminal device to implement the function, such as a chip system.
  • the device can be installed in a terminal device or used in conjunction with the terminal device.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the network device in the embodiment of the present application has a wireless transceiver function and is used to communicate with the terminal device.
  • the access network equipment can be a node in the radio access network (radio access network, RAN), and can also be called a base station or a RAN node. It can be an evolved base station (evolved Node B, eNB or eNodeB) in LTE; or a base station in a 5G network such as gNodeB (gNB) or a base station in a public land mobile network (public land mobile network, PLMN) evolved after 5G. Broadband network gateway (BNG), aggregation switch or 3rd generation partnership project (3GPP) access equipment, etc.
  • eNB evolved Node B
  • gNB gNodeB
  • PLMN public land mobile network
  • BNG Broadband network gateway
  • aggregation switch or 3rd generation partnership project (3GPP) access equipment etc.
  • the network equipment in the embodiment of the present application may also include various forms of base stations, such as: macro base stations, micro base stations (also called small stations), relay stations, access nodes in the Wi-Fi system, transmission points (transmitting and receiving point, TRP), transmitting point (TP), mobile switching center and device-to-device (D2D), vehicle outreach (vehicle-to-everything, V2X), machine-to-machine (machine- to-machine, M2M) Equipment that undertakes base station functions in communications can also include centralized units (CU) and distributed units (DU) and NTN in the cloud radio access network (C-RAN) system.
  • the network equipment in the communication system is not specifically limited in the embodiments of this application.
  • the device used to implement the function of the network device in the embodiment of the present application may be a network device, or may be a device that can support the network device to implement the function, such as a chip system.
  • the device can be installed in a network device or used in conjunction with a network device.
  • the chip system in the embodiment of the present application may be composed of chips, or may include chips and other discrete devices.
  • Figure 1 is a schematic diagram of a communication system architecture applicable to an embodiment of the present application.
  • the communication system includes terminal equipment and network equipment.
  • the embodiment of the present application does not limit the number of terminal devices and network devices included in the communication system.
  • the schematic diagram shown in Figure 1 is only used as an exemplary description and cannot limit the actual application scope of the technical solutions of the embodiments of the present application.
  • the terminal device shown in Figure 1 can be any terminal device listed above, and the network device can also be any network device listed above.
  • Codeword (codeword, CW) is a cyclic redundancy check (CRC) insertion and code for a transmission block (TB) sent on a transmission time interval (TTI).
  • CRC cyclic redundancy check
  • TTI transmission time interval
  • the data code stream obtained after block segmentation and inserting CRC, channel coding, and rate matching for each code block.
  • One codeword corresponds to one transport block.
  • a codeword becomes a layer mapped to multiple parallel transmissions (a layer can also be understood as a stream).
  • Codeword-to-layer mapping is used to represent the layer mapping relationship between codewords and layers.
  • layers are introduced to map the modulation symbols of codewords to different transmission layers.
  • the number of layers is equal to the number of data streams that can be transmitted independently in parallel.
  • the number of codewords is less than or equal to the number of layers, and the number of layers is less than or equal to the number of transmitting antennas.
  • 3GPP TS 38.211V17.0.0 predefines a table for mapping codewords to layers, as shown in Table 1.
  • Terminal equipment and network equipment can obtain the mapping of codewords to layers by looking up the table, that is, mapping the complex modulation symbols of each codeword to be transmitted to one or several layers.
  • the complex modulation symbols of codeword q are evenly mapped to v layers in order.
  • Both uplink and downlink transmission use predefined codeword-to-layer mapping tables, but the maximum number of layers supported by each is different.
  • Downlink transmission supports up to 2 codewords and 8 layers.
  • Uplink transmission supports up to 1 codeword and 4 layers.
  • the MIMO system will further increase the number of data streams transmitted in parallel.
  • the number of data streams that a MIMO system can support can increase to hundreds of streams, and the number of supported terminal devices is also increasing dramatically.
  • the above mapping of codewords to layers cannot support transmission with more than 4 layers (uplink)/8 layers (downlink).
  • mapping of codewords to layers is fixed, that is, for a certain layer number, the number of codewords that can be mapped is fixed, and all terminal devices use fixed mapping at all times, which will cause problems in the terminal In scenarios where there is a large performance difference between streams between devices or between streams at different times, this will seriously affect the system capacity performance of the MIMO system.
  • the existing codeword-to-layer mapping relationship cannot meet the increasingly large transceiver antenna scale requirements of MIMO systems.
  • embodiments of the present application provide a communication method and communication device that can dynamically adjust and/or indicate the mapping of codewords to layers.
  • the terminal device can use different mappings of codewords to layers at different times.
  • different terminal devices may use different codeword-to-layer mappings at the same time. Therefore, in scenarios where performance differences between streams between terminal devices are large or between streams at different times, it is possible to Using different codeword-to-layer mappings can also support the transmission of more streams, so that the codeword-to-layer mapping can meet the requirements of the MIMO system's gradually increasing transceiver antenna scale.
  • FIG. 1 is an interactive schematic diagram of the communication method in the embodiment of the present application.
  • This method #200 includes:
  • the second communication device determines a first indication parameter, where the first indication parameter has a corresponding relationship with the mapping of codewords to layers.
  • the description of the technical solution for codewords may be applied to transport blocks, coding blocks or data blocks.
  • the codewords may be replaced by transport blocks, coding blocks or data blocks.
  • the description of the technical solution of a layer may also be applied to a flow or a rank, for example, the layer may be replaced by a flow or a rank.
  • the mapping of codewords to layers can also be understood as: the mapping of codewords to streams, the mapping of transport blocks to layers, the mapping of transport blocks to streams, the mapping of the number of codewords to the number of layers, and the mapping of codeword identifiers to layer identifiers. Mapping and similar expressions.
  • the aforementioned mapping of codewords to layers may include a mapping table of codewords to layers, or may include a specific row or column in the mapping table of codewords to layers. Therefore, the first indication parameter
  • the corresponding relationship between the mapping of codewords to layers can be understood as: the corresponding relationship between the first indication parameter and the mapping table of codewords to layers, or the correspondence between the first indication parameter and the mapping table of codewords to layers.
  • There is a corresponding relationship between a specific row or a certain column in and the embodiment of the present application does not limit the understanding of the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer.
  • the embodiment of the present application uses the example of the corresponding relationship between the first indication parameter and the mapping table of codewords to layers to describe the technical solution of the embodiment of the present application, but does not exclude the mapping of the first indication parameter and the mapping table of codewords to layers.
  • a specific row or column in the table (the mapping table can be the existing Table 1, or Table 2, Table 3 or other tables in the embodiment of the present application) has a corresponding technical solution, and the two are in The technical solutions are the same or similar.
  • the embodiment of the present application does not elaborate on the technical solution in which the first indication parameter has a corresponding relationship with a specific row or column in the codeword-to-layer mapping table, but focuses on describing the third One indicates the correspondence between the parameters and the mapping table from codewords to layers.
  • the first indication parameter determined by the second communication device is determined by the second communication device from the indication parameters, and the indication parameter includes at least two candidate values of the first indication parameter.
  • the second communication device obtains information from multiple of the indicated parameters.
  • the first indication parameter is determined among the candidate values. This is further described below.
  • the indication parameter may be predefined, or may be indicated by the second communication device to the first communication device.
  • the first indication parameter includes at least one of the following: channel characteristics, service characteristics, communication device capabilities, or scheduling information, etc.
  • channel characteristics can characterize flow performance and differences between flows
  • service characteristics can characterize communication service requirements
  • communication device capabilities can characterize the processing capabilities of communication devices
  • scheduling information can characterize communication quality.
  • the above-mentioned first indication parameter has a significant impact on the mapping relationship between codewords and layers. In a scenario where the above-mentioned first indication parameter differs greatly between terminal devices or in a scenario where the above-mentioned first indication parameter differs greatly between different times, you can use Different codeword-to-layer mappings can improve communication capabilities.
  • the first indication parameter when the first indication parameter includes channel characteristics, the first indication parameter may include at least one of the channel characteristics; when the first indication parameter includes service characteristics, the first indication parameter may include at least one of the service characteristics. items; when the first indication parameter includes communication device capabilities, the first indication parameter may include at least one of the communication device capabilities; when the first indication parameter includes scheduling information, the first indication parameter may include at least one of the scheduling information. items, which will be described in detail below.
  • the channel characteristics include at least one of the following: channel characteristic value threshold, signal-to-noise ratio threshold, number of antenna ports, scene, location, channel path characteristics, channel delay characteristics or spectrum
  • the first indication parameter may include channel characteristic value threshold, At least one of the signal-to-noise ratio threshold, the number of antenna ports, scenarios, locations, channel path characteristics, channel delay characteristics, or spectrum, etc.
  • the indication parameters may include channel characteristic value thresholds, signal-to-noise ratio thresholds, number of antenna ports, scenarios, At least one of location, channel path characteristics, channel delay characteristics, or spectrum.
  • the service characteristics include at least one of the following: coverage, mobility, time sensitivity, transmission delay or reliability
  • the first indication parameter may include coverage, mobility, time sensitivity, transmission delay or reliability, etc.
  • At least one of the indication parameters may include at least one of coverage, mobility, time sensitivity, transmission delay or reliability.
  • the communication device capability includes at least one of the following: a maximum number of codewords supported, a maximum number of layers supported, or whether dynamic mapping of codewords to layers is supported.
  • the first indication parameter may include a maximum number of codewords supported, a maximum number of layers supported. Or whether at least one of dynamic mapping of codewords to layers is supported, etc., the indication parameter may include at least one of the maximum number of supported codewords, the maximum number of supported layers, or whether dynamic mapping of codewords to layers is supported.
  • the scheduling information includes at least one of the following: modulation mode, code rate, transport block size (TBS), or layer identifier.
  • the first indication parameter may include at least one of the modulation mode, code rate, transport block size, or layer identifier.
  • the indication parameter may include at least one of modulation mode, code rate, transport block size, layer identifier, etc.
  • the first communication device or the second communication device determines the mapping of codewords to layers based on service characteristics, and may further determine the mapping of codewords to layers based on service types.
  • the first indication parameter may include the service type.
  • the indication parameter may include the service type.
  • the indication parameters may include at least two of enhanced mobile broadband (enhance mobile broadband, eMBB), ultra-reliable and low latency communications (URLLC), or machine type communication (MTC). item.
  • the first indication parameter when the first indication parameter includes time sensitivity, the first indication parameter may include at least one of time sensitivity; when the first indication parameter includes reliability, the first indication parameter may include at least one of reliability. At least one item; when the first indication parameter includes a position, the first indication parameter may include at least one item of the position; when the first indication parameter includes a channel path characteristic, the first indication parameter may include at least one of the channel path characteristics. items, which will be detailed below describe.
  • Time sensitivity includes at least one of the following: execution time or response time.
  • the first indication parameter may include at least one of execution time, response time, etc.
  • the indication parameter may include at least one of execution time, response time, etc.
  • Reliability includes at least one of the following: validity, availability, accuracy, completeness, robustness, or scalability.
  • the first indication parameter may include at least one of validity, availability, accuracy, completeness, robustness, or scalability, and the indication parameter may include validity, availability, accuracy, completeness, robustness, or scalability. At least one of sex, etc.
  • the position includes at least one of the following: the position of the first communication device, the position of the second communication device, or the distance between the first communication device and the second communication device, the speed of the first communication device, the speed of the second communication device, or the third communication device.
  • the first indication parameter may include the position of the first communication device, the position of the second communication device or the distance between the first communication device and the second communication device, the speed of the first communication device, the speed of the second communication device or the first communication device.
  • the indication parameter may include the position of the first communication device, the position of the second communication device, or the distance between the first communication device and the second communication device , at least one of the speed of the first communication device, the speed of the second communication device, or the relative speed between the first communication device and the second communication device.
  • the channel path characteristics may include at least one of the following: number of paths, number of path clusters, path angle distribution status, path cluster angle distribution status, etc.
  • the first indication parameter may include at least one of the number of paths, the number of path clusters, the state of path angle distribution, the state of path cluster angle distribution, etc.
  • the indication parameter may include the number of paths, the number of path clusters, the state of path angle distribution, the state of path cluster angle distribution. At least one of the status, etc.
  • the channel characteristic value in the channel characteristic value threshold refers to the characteristic value of the channel on the antenna port.
  • the signal-to-noise ratio in the signal-to-noise ratio threshold refers to the signal-to-noise ratio of the channel on the antenna port.
  • the channel of the antenna port may be a channel of the antenna port that has not undergone precoding processing or beamforming, or may be a channel of the antenna port that has undergone precoding processing or beamforming.
  • the first indication parameter includes a channel characteristic value threshold
  • the first indication parameter includes at least one of a channel characteristic value threshold, a signal power threshold, a signal energy threshold, or a reference signal received power (RSRP) threshold.
  • the indication parameter includes a channel characteristic value threshold
  • the indication parameter includes at least one of the channel characteristic value threshold, signal power threshold, signal energy threshold, or reference signal received power (RSRP) threshold.
  • the first indication parameter includes a signal-to-noise ratio threshold
  • the first indication parameter includes a signal-to-noise ratio (SNR) threshold or a signal-to-interference&noise ratio (SINR) threshold, etc.
  • SNR signal-to-noise ratio
  • SINR signal-to-interference&noise ratio
  • SINR signal-to-interference&noise ratio
  • the first indication parameter includes the number of antenna ports
  • the first indication parameter includes the number of ports configured in the channel state information reference signal (CSI-RS) resource, the sounding reference signal (sounding reference signal), At least one of the number of ports configured with SRS) resources, the number of ports configured with demodulation reference signal (DMRS) resources, the number of receiving antenna ports, the number of transmitting antenna ports, the maximum number of receiving antenna ports, or the maximum number of transmitting antenna ports. item.
  • the indication parameter includes the number of antenna ports
  • the indication parameter includes channel state information-reference signal (channel state information).
  • the number of ports configured with information reference signal (CSI-RS) resources the number of ports configured with sounding reference signal (SRS) resources, the number of ports configured with demodulation reference signal (DMRS) resources, receiving antenna ports At least one of the number, the number of transmitting antenna ports, the maximum number of receiving antenna ports, or the maximum number of transmitting antenna ports.
  • CSI-RS information reference signal
  • SRS sounding reference signal
  • DMRS demodulation reference signal
  • the first indication parameter includes a layer identifier
  • the first indication parameter includes at least one of a starting layer identifier, a termination layer identifier, and the like.
  • the indication parameter includes a layer identifier
  • the indication parameter includes at least one of a starting layer identifier or an ending layer identifier.
  • the layer identifier can be any non-negative integer less than or equal to the maximum supported number of layers.
  • the first indication parameter includes a frequency band
  • the first indication parameter includes at least one of a spectrum, a frequency band, a frequency point, a frequency band, or a frequency.
  • the indication parameter includes a frequency band
  • the indication parameter includes at least one of a spectrum, a frequency band, a frequency point, a frequency band, or a frequency.
  • the indication parameter is any one of transmission delay, scenario, channel path characteristics, channel delay characteristics, modulation method, reliability, frequency, and code rate
  • the candidate values included in the indication parameter will be detailed below. describe.
  • the indication parameter includes at least two of transmission delay, scenario, channel path characteristics, channel delay characteristics, modulation mode, reliability, frequency, code rate, etc.
  • the candidate values included in the indication parameter are multiple indication parameters. The combination of candidate values will not be described again below.
  • the indication parameter When the indication parameter is transmission delay, the indication parameter includes at least two of ultra-low transmission delay, low transmission delay, high transmission delay and ultra-high transmission delay.
  • the indication parameters include at least two of (0, 0.1], (0.1ms, 3ms], (3ms, 30ms] or (30ms, ⁇ ], etc.
  • the indication parameter When the indication parameter is a scene, the indication parameter includes outdoor (outdoor), indoor (indoor), urban microcell (UMi), urban macrocell (UMa), suburban/rural macrocell (RMa) ), street (street), office (indoor-office), factory (indoor factory, InF) and vehicle (vehicle), etc. At least two items.
  • the indication parameter when the indication parameter is a channel path characteristic, the indication parameter includes at least two items including line of sight (LOS) and non-line of sight (NLOS).
  • LOS line of sight
  • NLOS non-line of sight
  • the indication parameter when the indication parameter is a channel delay characteristic, the indication parameter includes at least two of high delay, medium delay, low delay and ultra-low delay.
  • high latency is (1000ns, ⁇ ]
  • medium latency is (100ns, 1000ns]
  • low latency is (10ns, 100ns]
  • ultra-low latency is (0ns, 10ns].
  • the indication parameter includes at least two of ultra-low mobility, low mobility, high mobility, and ultra-high mobility.
  • ultra-low mobility is (0, 10km/h]
  • low mobility is (10km/h, 50km/h]
  • high mobility is (50km/h, 200km/h]
  • ultra-high mobility is (200km /h, ⁇ ] etc.
  • the indication parameter when the indication parameter is a modulation method, includes at least two of quadrature phase shift keying (QPSK), 64 quadrature amplitude modulation (quadrature amplitude modulation, QAM), 256QAM or 1024QAM.
  • QPSK quadrature phase shift keying
  • QAM quadrature amplitude modulation
  • 256QAM 256QAM
  • 1024QAM 1024QAM
  • the indication parameter includes a frequency band (which can also be understood as spectrum, frequency band, frequency point, frequency band or frequency)
  • the indication parameter includes at least two of low frequency, high frequency, millimeter wave and terahertz.
  • the indication parameter includes at least two of 3.5GHz, 39GHz or 300GHz.
  • the indicator parameter when the indicator parameter is reliability, the indicator parameter includes at least two of low reliability, high reliability, and ultra-high reliability. Alternatively, the indication parameter includes at least two of 99.9999999%, 99.99999%, 99.999%, and so on.
  • the indication parameter includes code rate
  • the indication parameter includes ultra-high code rate, high code rate, medium code rate, low code rate and ultra-low code rate. At least two of the above.
  • the indication parameter includes at least two of (0.8, 0.94], (0.6, 0.8], (0.4, 0.6], (0.2, 0.4] or (0, 0.2], etc.
  • the first indication parameter may be any of the above-mentioned parameters.
  • the specific value or type in the parameter For example, if the indication parameter is transmission delay, the first indication parameter can be low transmission delay; when the indication parameter is scene, the first indication parameter can be outdoor; when the indication parameter is modulation mode , the first indication parameter may be QPSK, etc.
  • the first indication parameter may be a specific value or combination of types among multiple parameters among the parameters mentioned above. For example, when the indication parameter is transmission delay and reliability, the first indication parameter may be low transmission delay. and ultra-high reliability.
  • the first indication parameter can be understood as a specific indication parameter among the indication parameters.
  • the indication parameter is transmission delay
  • the indication parameter includes at least two of ultra-low transmission delay, low transmission delay, high transmission delay, and ultra-high transmission delay
  • the first indication parameter may be low transmission delay.
  • the indication parameter when the indication parameter is a scene, the indication parameter includes outdoor (outdoor), indoor (indoor), urban microcell (UMi), urban macrocell (urban maceocell, UMa), suburban/rural macrocell (rural macrocell) , at least two of RMa), street (street), office (indoor-office), factory (indoor factory, InF) and vehicle (vehicle), etc.
  • the first indication parameter can be outdoor;
  • the indication parameters include at least two of quadrature phase shift keying (QPSK), 64 quadrature amplitude modulation (QAM), 256QAM or 1024QAM.
  • the first The indication parameter can be QPSK, etc.; when the indication parameter is transmission delay and reliability, the indication parameter includes low transmission delay and ultra-high reliability, high transmission delay and ultra-high reliability, low transmission delay and low Reliability, high transmission delay and low reliability, the first indicator parameter may be low transmission delay and ultra-high reliability.
  • different candidate values in the indication parameter correspond to different mappings of codewords to layers.
  • different candidate values in the indication parameter have different corresponding relationships with the mapping of codewords to layers.
  • the indication parameter contains at least two candidate values, and there are at least two correspondences between the indication parameter and the mapping of the codeword to the layer, including a correspondence between the first indication parameter and the mapping of the codeword to the layer.
  • the candidate values in the indication parameter include ⁇ #A, #B ⁇ , and the corresponding relationship between the indication parameter and the mapping of codewords to layers is as follows: the indication parameter is #A, which corresponds to the mapping of codewords to layers #A1; the indication parameter is #B, which corresponds to the mapping of codewords to layers #B1.
  • the codeword-to-layer mapping #A1 may be at least two columns or at least two rows in Table 2.
  • the codeword-to-layer mapping #B1 may be at least two columns or at least two rows in Table 3.
  • the first indication parameter is #A. According to the corresponding relationship between the above indication parameter and the mapping of codewords to layers and/or the corresponding relationship between the first indication parameter and the mapping of codewords to layers, it can be known that the mapping of codewords to layers is # A1.
  • the manner in which the first communication device determines the corresponding relationship between the indication parameter and the mapping of codewords to layers and/or the corresponding relationship between the first indication parameter and the mapping of codewords to layers is explained in S230, which will not be described again here.
  • the first column is the number of layers
  • the second column is the number of codewords
  • the third column is the description of the codeword-to-layer mapping 1
  • the fourth column is the codeword-to-layer mapping 2 describe.
  • the third column describes the mapping of each codeword to a layer.
  • the fourth column describes the mapping of the complex modulation symbols of each codeword to the complex modulation symbols of the layer.
  • the third column and the fourth column have a corresponding relationship, and one column can be used to deduce the other. For specific derivation, see Table 2 or Table 3.
  • Table 2 is the mapping #A1 from the codeword corresponding to the indicator parameter #A to the layer
  • Table 3 is the mapping from the codeword corresponding to the indicator parameter #B to the layer. Mapping #B1.
  • Table 2 or Table 3 can also be understood as the mapping of codewords to layers corresponding to the number of layers n, 1 ⁇ n ⁇ L. n layers are mapped to C n codewords, as shown in the first and second columns of the table.
  • the layer identifier is [0, 1, ..., n-1]
  • the codeword identifier is [0, 1, ..., C n -1].
  • the third column describes the mapping of each of the C n codewords to the layer identifier.
  • the layer identifier mapped by codeword q is Among them, the number of layers mapped by the first q+1 codewords is 0 ⁇ q ⁇ C n -1. The number of layers mapped by codeword q is in, 0 ⁇ q ⁇ C n -1.
  • the fourth column describes the mapping of the complex modulation symbols of each of the C n codewords to the complex modulation symbols of the layer. Complex modulation symbol of codeword q Modulation symbols mapped to layers superior, is the total number of modulation symbols of codeword q.
  • Table 2 uses the modulation symbols of codeword q evenly divided into layers, so the number of modulation symbols in each layer is Specifically, all modulation symbols of codeword q are grouped, and each group has modulation symbols, divided into groups, the modulation symbols in each group are mapped to on a layer. In this way, each group of modulation symbols is mapped to each layer, as follows:
  • the embodiment of the present application takes the uniform distribution of modulation symbols as an example to describe the mapping of codewords to layers.
  • the mapping of codewords to layers may also use the non-uniform distribution of modulation symbols.
  • the modulation symbols of a part of each codeword are only allocated to the layers of a part of the codeword, and the modulation symbols of another part of the codeword are only allocated to the layers of another part of the codeword.
  • Table 3 please refer to the description of Table 2 and will not be described again here.
  • the embodiment of the present application does not limit the number of candidate values of the indication parameter.
  • the embodiment of this application takes the number of candidate values of the indication parameter as 2 as an example to describe the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer.
  • the number of candidate values is greater than 2
  • Table 2 indicates the mapping of codewords corresponding to parameter #A to layer #A1
  • Table 3 indicates the mapping of codewords corresponding to parameter #B to layer #B1
  • the channel characteristic value threshold (dB) (which can be understood as an indicator parameter) includes at least 2 candidate values among ⁇ 5, 10, 15, 20,... ⁇ . Sindote
  • the eigenvalue threshold (dB) is 5 (can be understood as the first indication parameter), which corresponds to the mapping of codewords to layers #A1; the channel eigenvalue threshold (dB) is 10, which corresponds to the mapping of codewords to layers #B1, etc.
  • the above-mentioned channel characteristic value threshold can be understood as one of channel characteristic value threshold, signal power threshold, signal energy threshold or reference signal received power threshold.
  • the signal-to-noise ratio threshold (dB) (which can be understood as an indicator parameter) includes at least 2 candidate values among ⁇ 5, 10, 15, 20,... ⁇ .
  • the signal-to-noise ratio threshold (dB) is 5 (can be understood as the first indicator parameter), which corresponds to the mapping of codewords to layers #A1; the signal-to-noise ratio threshold (dB) is 10, which corresponds to the mapping of codewords to layers #B1 ,etc.
  • the above-mentioned signal-to-noise ratio threshold can be understood as one of the signal-to-noise ratio threshold or the signal-to-interference-to-noise ratio threshold.
  • the number of antenna ports correspond to different mappings of codewords to layers.
  • the number of antenna ports (can be understood as an indication parameter) includes at least 2 candidate values among ⁇ 4, 8, 16, 32, 64, 128, 256, 512, 1024,... ⁇ .
  • the number of antenna ports is 64 (can be understood as the first indication parameter), which corresponds to the mapping of codewords to layers #A1; the number of antenna ports is 1024, which corresponds to the mapping of codewords to layers #B1, and so on.
  • the above number of antenna ports can be understood as the number of ports configured with channel state information reference signal (CSI-RS) resources, the number of ports configured with sounding reference signal (SRS) resources, and demodulation reference One of the number of ports, the number of receiving antenna ports, the number of transmitting antenna ports, the maximum number of receiving antenna ports, or the maximum number of transmitting antenna ports for signal (demodulation reference signal, DMRS) resource configuration.
  • CSI-RS channel state information reference signal
  • SRS sounding reference signal
  • DMRS demodulation reference signal
  • Table 4 exemplifies the mapping #A1 from codewords to layers corresponding to the number of antenna ports being 64
  • Table 5 exemplifies the mapping #B1 from codewords to layers corresponding to the number of antenna ports being 1024.
  • Table 4 and Table 5 are schematic tables showing the mapping of codewords to layers corresponding to the number of antenna ports as indicator parameters, and the codewords corresponding to other indicator parameters such as scene, location, distance, etc.
  • layer mapping you can also refer to the content shown in Table 4 or Table 5, which will not be described again later.
  • the scenario corresponds to different mappings of codewords to layers.
  • the scenario (can be understood as an indicator parameter) includes at least 2 candidate values in ⁇ outdoor, indoor, urban micro cell, urban macro cell, suburban/rural macro cell, street, office, factory, transportation,... ⁇ .
  • the scene is an urban micro cell (which can be understood as the first indication parameter), which corresponds to the codeword to layer mapping #A1; the scene is an urban macro cell, which corresponds to the codeword to layer mapping #B1; the scene is a suburban/rural macro cell , which corresponds to the mapping of codewords to layers #C1, and so on.
  • the distance between the first communication device and the second communication device correspond to different mappings of codewords to layers.
  • the distance between the first communication device and the second communication device (can be understood as an indication parameter) includes at least 2 candidate values among ⁇ 150m, 300m, 500m, 1000m, ... ⁇ .
  • the distance between the first communication device and the second communication device is 150m (can be understood as the first indication parameter), which corresponds to the mapping of codewords to layers #A1; the distance between the first communication device and the second communication device is 300m, which corresponds to the mapping of codewords to layer #B1, etc.
  • different channel path characteristics correspond to different mappings of codewords to layers.
  • the channel path characteristics (can be understood as indicator parameters) include at least two candidate values in ⁇ line-of-sight, non-line-of-sight,... ⁇ .
  • the channel path characteristic is LOS (can be understood as the first indication parameter), which corresponds to the mapping of codewords to layers #A1; the channel path characteristic is NLOS, which corresponds to the mapping of codewords to layers #B1, and so on.
  • channel delay characteristics correspond to different mappings of codewords to layers.
  • the channel delay characteristics (can be understood as indicator parameters) include at least 2 candidate values in ⁇ high delay, medium delay, low delay, ultra-low delay,... ⁇ , where high delay (ns), Medium latency (ns), low latency (ns), and ultra-low latency (ns) can also be described by (1000, ⁇ ], (100, 1000], (10, 100], (0, 10].
  • the channel delay characteristic is ultra-low delay (can be understood as the first indicator parameter), which corresponds to the mapping of codewords to layers #A1; the channel delay characteristic is low delay, which corresponds to the mapping of codewords to layers #B1; the channel delay characteristic is medium delay, which corresponds to the mapping of codewords to layers #C1; the channel delay characteristic is high delay, which corresponds to the mapping of codewords to layers #D1, and so on.
  • the channel delay characteristic (ns) is (0, 10], which corresponds to the mapping of codewords to layers #A1; the channel delay characteristic (ns) is (10, 100], which corresponds to the mapping of codewords to layers # B1; The channel delay characteristic (ns) is (100, 1000], which corresponds to the mapping of codewords to layers #C1; The channel delay characteristic (ns) is (1000, ⁇ ], which corresponds to the mapping of codewords to layers # D1, etc.
  • different frequency spectra correspond to different mappings of codewords to layers.
  • the spectrum (can be understood as an indicator parameter) includes at least 2 candidate values in ⁇ low frequency, high frequency, millimeter wave, terahertz, etc. ⁇ .
  • Low frequency (GHz), high frequency (GHz), millimeter wave (GHz), terahertz (GHz), etc. can also be described by 3.5, 39, 300, 1000.
  • the spectrum is low frequency (can be understood as the first indicator parameter), which corresponds to the mapping of codewords to layers #A1; the spectrum is millimeter wave, which corresponds to the mapping of codewords to layers #B1; the spectrum is terahertz, which corresponds to Mapping of codewords to layer #C1, etc.
  • the spectrum (GHz) is 3.5, which corresponds to the codeword to layer mapping #A1; the spectrum (GHz) is 300, which corresponds to the codeword to layer mapping #B1; the spectrum (GHz) is 1000, which corresponds to the codeword Mapping to layer #C1, etc.
  • the service type (can be understood as an indication parameter) includes at least two candidate values in ⁇ eMBB, URLLC, MTC,... ⁇ .
  • eMBB (can be understood as the first indication parameter) corresponds to the mapping of codewords to layers #A1
  • URLLC corresponds to the mapping of codewords to layers #B1
  • MTC corresponds to the mapping of codewords to layers #C1, and so on.
  • different modulation modes correspond to different mappings of codewords to layers.
  • the modulation method (it can be understood that is an indication parameter) including at least 2 candidate values among ⁇ QPSK, 64QAM, 256QAM, 1024QAM,... ⁇ .
  • QPSK (can be understood as the first indication parameter) corresponds to the mapping of codewords to layers #A1; 64QAM corresponds to the mapping of codewords to layers #B1; 256QAM corresponds to the mapping of codewords to layers #C1; 1024QAM corresponds to the mapping of codewords to layers #C1 Mapping to layer #D1, etc.
  • the code rate (which can be understood as an indicator parameter) includes at least 2 candidate values among ⁇ ultra-high code rate, high code rate, medium code rate, low code rate, ultra-low code rate,... ⁇ .
  • Ultra-high bit rate, high bit rate, medium bit rate, low bit rate, ultra-low bit rate, etc. can also be used (0.8, 0.94], (0.6, 0.8], (0.4, 0.6], (0.2, 0.4], ( 0, 0.2] for description.
  • the ultra-high code rate (can be understood as the first indicator parameter) corresponds to the mapping of codewords to layers #A1; the high code rate corresponds to the mapping of codewords to layers #B1; the medium code rate corresponds to the code Mapping #C1 from word to layer; Mapping #D1 corresponding to codeword to layer for low code rate; Mapping #E1 corresponding to codeword to layer for ultra-low code rate, etc.
  • mapping codeword to Layer mapping #A1 corresponds to mapping codeword to Layer mapping #A1;
  • 0.6, 0.8 corresponds to codeword to layer mapping #B1;
  • 0.4, 0.6] corresponds to codeword to layer mapping #C1;
  • 0.2, 0.4] corresponds to codeword to layer mapping #D1 ; (0, 0.2] corresponds to the mapping of codewords to layer #E1, and so on.
  • different reliability service types correspond to different mappings of codewords to layers.
  • reliability (can be understood as an indicator parameter) includes at least 2 candidate values in ⁇ ultra-high reliability, high reliability, medium reliability, low reliability, ultra-low reliability,... ⁇ .
  • ultra-high reliability, high reliability, low reliability, etc. can also be described by 99.9999999%, 99.99999%, and 99.999%.
  • 99.9999999% (can be understood as the first indication parameter) corresponds to the mapping of codewords to layer #A1; 99.99999% corresponds to the mapping of codewords to layer #B1, 99.999% corresponds to the mapping of codewords to layer #C1, and so on.
  • Ultra-high reliability corresponds to codeword-to-layer mapping #A1; high reliability corresponds to codeword-to-layer mapping #B1, low reliability corresponds to codeword-to-layer mapping #C1, and so on.
  • the maximum supported number of codewords (can be understood as an indication parameter) includes at least 2 candidate values among ⁇ 2, 4, 6, 8,... ⁇ .
  • the maximum number of codewords supported is 2 (can be understood as the first indication parameter), which corresponds to the mapping relationship #A1 from codewords to layers; the maximum number of codewords supported is 8, which corresponds to the mapping relationship #B1 from codewords to layers. etc.
  • the maximum supported number of layers (can be understood as an indicator parameter) is at least 2 candidate values among ⁇ 4, 8, 16, 32,... ⁇ .
  • the maximum number of supported layers is 4 (can be understood as the first indication parameter), corresponding to the mapping relationship #A1 from codewords to layers; the maximum number of supported codewords is 32, and the corresponding mapping relationship #B1 from codewords to layers, etc. wait.
  • dynamic mapping of codewords to layers corresponds to different mappings of codewords to layers.
  • dynamic mapping of codewords to layers is supported (can be understood as the first indication parameter), which corresponds to the mapping relationship #A1 of codewords to layers; dynamic mapping of codewords to layers is not supported, which corresponds to the mapping relationship # of codewords to layers. B1.
  • different layer identifiers correspond to different mappings of codewords to layers.
  • the layer identifier (can be understood as an indication parameter) includes at least 2 candidate values among ⁇ 1, 2, 3, 4,... ⁇ .
  • the layer identifier is 1 (which can be understood as the first indication parameter), corresponding to the mapping relationship #A1 from codewords to layers; the layer identifier is 4, corresponding to the mapping relationship #B1 from codewords to layers.
  • the above-mentioned layer identifier can be understood as one of the starting layer identifier and the ending layer identifier.
  • mobility corresponds to different mappings of codewords to layers.
  • mobility can be understood as an indicator parameter
  • mobility includes at least 2 candidate values in ⁇ ultra-low mobility, low mobility, high mobility, ultra-high mobility,... ⁇ .
  • Ultra-low mobility (km/h), low mobility (km/h), high mobility (km/h) can be used (0, 10], (10, 50], (50, 200], (200 , ⁇ ] description.
  • ultra-low mobility corresponds to the mapping relationship #A1 from codewords to layers; low mobility corresponds to the mapping relationship #B1 from codewords to layers; high mobility corresponds to codes Word-to-layer mapping #C1; Ultra-high mobility, corresponding codeword to layer mapping relationship #D1, etc.
  • (0, 10) corresponds to the mapping relationship #A2 from codewords to layers; (10, 50) corresponds to the mapping relationship #B2 from codewords to layers; (50, 200) corresponds to the mapping relationship #C2 from codewords to layers ;(200, ⁇ ], corresponding to the mapping relationship from codeword to layer #D2, etc.
  • the transmission delay (can be understood as an indicator parameter) includes at least two candidate values among ⁇ ultra-high transmission delay, high transmission delay, low transmission delay, ultra-low transmission delay, ... ⁇ .
  • Ultra-high transmission delay (ms), high transmission delay (ms), low transmission delay (ms), and ultra-low transmission delay (ms) can be used (0, 0.1], (0.1, 3], (3, 30], (30, ⁇ ] description.
  • ultra-high transmission delay corresponds to the mapping relationship #A1 from codewords to layers; high transmission delay corresponds to the mapping relationship from codewords to layers #B1; low transmission delay corresponds to the mapping relationship #C1 from codewords to layers; ultra-low transmission delay corresponds to the mapping relationship #D1 from codewords to layers, etc.
  • the transmission delay is (0, 0.1]
  • the corresponding codeword to layer mapping relationship is #A2; the transmission delay is (0.1, 3), which corresponds to the codeword to layer mapping relationship #B2; the transmission delay is (3, 30), which corresponds to the codeword to layer mapping relationship #C2 ;
  • the transmission delay is (30, ⁇ ] corresponding to the mapping relationship #D2 from codeword to layer, and so on.
  • the first indication parameter may be one parameter, or may be two or more parameters.
  • the indication parameter can be one parameter or two or more parameters.
  • channel characteristic value thresholds and layer identifiers correspond to different mappings of codewords to layers.
  • the combination of channel characteristic value threshold and layer identifier (can be understood as an indication parameter) includes ⁇ channel characteristic value threshold (dB) is 10 and layer identifier 1, channel characteristic value threshold (dB) is 10 and layer identifier 9,... ⁇ at least 2 candidate values.
  • the channel characteristic value threshold (dB) is 10 and the layer identifier is 1 (can be understood as the first indication parameter), which corresponds to the mapping of codewords to layers #A1; the channel characteristic value threshold (dB) is 10 and the layer identifier is 9, which corresponds to Mapping of codewords to layer #B1, etc.
  • the combination of the signal-to-noise ratio threshold and the layer identifier (which can be understood as an indication parameter) includes ⁇ the signal-to-noise ratio threshold (dB) is 10 and the layer identifier 1, the signal-to-noise ratio threshold (dB) is 10 and the layer identifier 9,... ⁇ at least 2 candidate values.
  • the signal-to-noise ratio threshold (dB) is 10 and the layer identifier is 1 (can be understood as the first indication parameter), which corresponds to the mapping of codewords to layers #A1; the signal-to-noise ratio threshold (dB) is 10 and the layer identifier is 9, which corresponds to Mapping of codewords to layer #B1, etc.
  • the embodiment of the present application does not limit the number of codewords, the number of layers, and the number of candidate values in the indication parameter.
  • the second communication device establishes a corresponding relationship between any one or more of the above indication parameters and the mapping of codewords to layers, where the indication parameters include at least two candidate values.
  • the first indication parameter determined by the second communication device is selected from a plurality of candidate values in the indication parameter, for example, ⁇ #Y, #Z,... ⁇ , so that the second communication device can based on the first indication Parameters enable flexible and dynamic adjustment or indicate the mapping of codewords to layers.
  • the second communication device sends the first indication parameter to the first communication device.
  • the first communication device receives the first indication parameter sent by the second communication device.
  • the second communication device may send the first indication parameter to the first communication device through high-layer signaling or physical layer signaling.
  • the embodiment of the present application is described by taking the first indication parameter sent by the second communication device to the first communication device as the first indication parameter #A as an example.
  • the second communication device may send the first indication parameter to the first communication device in at least one of data transmission, CSI feedback, and codec, or may send the first indication parameter to the first communication device in other communication processes.
  • first instruction Parameters are not limited in the embodiments of this application.
  • data transmission may include: data reception and/or data transmission.
  • high-level signaling may include radio resource control (RRC) signaling, media access control (media access control, MAC) signaling, or other high-level signaling, etc.
  • RRC radio resource control
  • MAC media access control
  • Physical layer signaling may include downlink control information (DCI) signaling, or other physical layer signaling, such as uplink control information (UCI) and so on.
  • DCI downlink control information
  • UCI uplink control information
  • the indication information corresponding to the first indication parameter may be user-level indication information, user group-level indication information or cell-level indication information.
  • the user-level indication information means that the first indication parameter sent by the second communication device to the first communication device is only applicable to the first communication device and not applicable to other first communication devices.
  • the user group level indication information means that the first indication parameter sent by the second communication device to the first communication device is not only applicable to the first communication device, but also applicable to other first communication devices.
  • Cell-level indication information means that the first indication parameter sent by the second communication device to the first communication device is not only applicable to the first communication device, but also applicable to all other first communication devices in the same cell as the first communication device.
  • the second communication device configures multiple candidate values in the indication parameter in semi-static RRC signaling, or the multiple candidate values in the indication parameter are predefined, and the second communication device configures the indication parameter through dynamic DCI signaling.
  • the bit field of the signal is used to indicate one of multiple candidate values configured or predefined in the RRC signaling, for example, the first indication parameter.
  • the number of bits used for indication in the DCI signaling may be determined according to the number of candidate values configured in the RRC signaling.
  • the indication parameter includes two candidate values: #A and #B. In this embodiment, bit "1" is used to indicate #A, and bit "0" is used to indicate #B. Therefore, this embodiment of the present application may use one bit of DCI signaling to indicate the first indication parameter.
  • the first communication device may determine the first indication parameter sent by the second communication device to the first communication device based on the bit field in the DCI.
  • the first communication device determines the mapping of codewords of the DCI scheduled data to layers according to the first indication parameter.
  • the second communication device may configure in RRC signaling whether the DCI includes a bit field used to indicate the first indication parameter, and the first communication device determines whether the DCI includes the first indication parameter based on the indication field.
  • the second communication device may not configure the indication field in RRC signaling, and the first communication device determines whether it includes the first indication parameter by blindly checking the DCI.
  • the second communication device configures multiple candidate values of the indication parameter in semi-static RRC signaling, or the multiple candidate values of the indication parameter are predefined, and the second communication device configures multiple candidate values of the indication parameter through semi-static RRC signaling.
  • the signaling indicates one of a plurality of candidate values, for example, a first indication parameter.
  • the first communication device determines a mapping of codewords to layers based on the first indication parameter.
  • the DCI signaling sent by the second communication device to the first communication device may be a group of DCIs, and the group of DCIs includes multiple information blocks.
  • One information block corresponds to one first communication device.
  • a first indication parameter may be indicated using one or more bits.
  • An information block of a first communication device includes at least one bit for indicating the first indication parameter, and the number of DCI bits included in the information block may be determined according to the number of candidates in the indication parameter.
  • the second communication device may configure the specific position of its corresponding information block in the group of DCIs for each first communication device in the RRC signaling.
  • Group DCI can jointly send control information of a group of users, which can reduce control signaling overhead and control channel resource overhead.
  • the first indication parameter is applicable to multiple first communication devices, that is, multiple first communication devices
  • One first indication parameter can be shared.
  • the first communication device may configure a group number for the user group in RRC signaling.
  • One group number corresponds to one user group, and one user group includes multiple first communication devices.
  • a user group corresponds to a first indication parameter
  • a user group corresponds to a DCI information block
  • the position of the information block in the DCI is configured in RRC signaling.
  • the information block includes at least one bit used to indicate the first indication parameter, and the number of DCI bits included in the information block may be determined according to the number of candidates in the indication parameter.
  • the first communication device determines the position of the corresponding information block in the RRC signaling according to its own group number and obtains the first indication parameter. Compared with user-level instructions, this implementation can significantly reduce signaling overhead.
  • the first indication parameter is applicable to all first communication devices in a cell.
  • the second communication device broadcasts the first indication parameter to all first communication devices in a cell.
  • the second communication device indicates the first indication parameter in a physical broadcast channel (PBCH) or a system information block (SIB) or public RRC signaling.
  • PBCH physical broadcast channel
  • SIB system information block
  • public RRC signaling Compared with user-level instructions or user group-level instructions, this implementation can significantly reduce signaling overhead.
  • the second communication device senses the change of the scene in advance.
  • the second communication device can indicate the scene and take effect to the first communication device in advance. Time (referring to the time when the mapping of the codeword to the layer corresponding to the scene takes effect).
  • the first communication device when the first communication device senses that the scene has changed, it can feed back the scene information to the second communication device.
  • the first communication device may be a terminal device (hereinafter, the first communication device is a terminal device will be described as an example), and the second communication device may be a network device (hereinafter, the second communication device is a network device).
  • the device is described as an example). Therefore, S220 can be understood as: the network device sends the first indication parameter to the terminal device.
  • the first communication device and the second communication device may both be terminal equipment.
  • the first communication device and the second communication device may both be terminal equipment. Therefore, S220 can also be understood as: one terminal device sends the first indication parameter to another terminal device.
  • S220 can also be understood as: one terminal device sends the first indication parameter to another terminal device.
  • this embodiment of the present application takes the second communication device as a network device as an example to describe the technical solution of the embodiment of the present application, but the possibility that the second communication device is a terminal device cannot be ruled out.
  • S220 can be understood as: the first communication device receives the first indication parameter, where the first communication device is a terminal device.
  • the first communication device determines the mapping of the first codeword to the layer according to the first indication parameter.
  • the first communication device may determine the mapping of the first codeword to the layer according to the first indication parameter. More specifically, the first communication device may determine the mapping of the first codeword to the layer after determining the correspondence between the first indication parameter and the mapping of the first codeword to the layer.
  • the first communication device can determine the corresponding relationship in the following three ways:
  • Method #1 The second communication device sends the corresponding relationship to the first communication device
  • Method #2 The first communication device determines the corresponding relationship according to the first indication parameter
  • the first communication device determines the mapping of codewords to layers through the first indication parameter sent by the second communication device and the corresponding relationship.
  • the first communication device may determine the corresponding relationship based on the first indication parameter sent by the second communication device.
  • the process or rule of the first communication device determining the corresponding relationship based on the first indication parameter is the same as the second communication device based on the first indication parameter.
  • the process or rules for determining the corresponding relationship by the first indication parameter are consistent. This can be determined by pre-defining the protocol on the terminal equipment side and the network equipment side. In this way, the second communication device
  • the first indication parameter can be directly sent to the first communication device without sending the corresponding relationship.
  • the first communication device can determine the mapping of codewords to layers based on the first indication parameter. In this way, signaling overhead can be saved.
  • the corresponding relationship between the indication parameter and the mapping of the codeword to the layer is configured in a predefined manner, which includes the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer (which can be understood as this correspondence).
  • the indication parameter contains at least 2 candidate values, and there are at least 2 corresponding relationships between the indication parameter and the mapping of the codeword to the layer.
  • the second communication device can directly send the first indication parameter to the first communication device without sending the corresponding relationship.
  • the first communication device can determine the mapping of codewords to layers based on the first indication parameter. In this way, information can be saved. Order overhead.
  • a possible implementation method is that the second communication device can send the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer to the first communication device in real time through physical layer signaling (which can be understood as the corresponding relationship ).
  • the second communication device indicates the corresponding relationship to the first communication device through DCI or group DCI signaling.
  • a possible implementation method is that the second communication device can send the corresponding relationship between the indication parameter and the mapping of the codeword to the layer to the first communication device through high-layer signaling, which includes the first indication parameter and the mapping of the codeword to the layer.
  • the corresponding relationship between layer mappings can be understood as this corresponding relationship).
  • the indication parameter contains at least 2 candidate values, and there are at least 2 corresponding relationships between the indication parameter and the mapping of the codeword to the layer.
  • the second communication device indicates to the first communication device through semi-static RRC signaling the corresponding relationship between the indication parameter and the mapping of the codeword to the layer, which includes the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer (may understood as the corresponding relationship), the first communication device can determine the corresponding relationship.
  • using semi-static RRC to indicate the corresponding relationship between parameters and codeword-to-layer mapping can save signaling overhead.
  • a possible implementation manner is that the first communication device has a memory function for the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer. Therefore, the second communication device determines whether the corresponding relationship has been indicated to the first communication device before, in other words, whether the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer saved by the first communication device is the same as the corresponding relationship, If yes, the correspondence does not need to be indicated again; if not, the second communication device can send the correspondence between the first indication parameter and the mapping of the codeword to the layer to the first communication device through physical layer signaling (this correspondence can be understood) , for example, the second communication device indicates the corresponding relationship to the first communication device through DCI or group DCI signaling.
  • the first notification device receives the corresponding relationship and saves it. Afterwards, when the first communication device receives the first indication parameter again, the corresponding relationship can be directly determined without the need for the second communication device to indicate the corresponding relationship. Compared with using dynamic DCI to indicate the corresponding relationship in real time, this method can save signaling overhead.
  • the indication information corresponding to the correspondence relationship may be user-level indication information, user group-level indication information or cell-level indication information.
  • the user-level indication information means that the corresponding relationship sent by the second communication device to the first communication device is only applicable to the first communication device and not applicable to other first communication devices.
  • the user group level indication information means that the corresponding relationship sent by the second communication device to the first communication device is not only applicable to the first communication device, but also applicable to other first communication devices.
  • Cell-level indication information means that the corresponding relationship sent by the second communication device to the first communication device is not only applicable to the first communication device, but also applicable to all other first communication devices in the same cell as the first communication device.
  • the first communication device may based on the first indication parameter and the first indication parameter and the first codeword. Mapping to layer The correspondence between determines the mapping of the first codeword to the layer.
  • the first communication device sends capability indication information to the second communication device, where the capability indication information is used to indicate whether the first communication device supports dynamic mapping of codewords to layers. This step may occur before S210 or before S230, and is not specifically limited in the embodiment of this application.
  • the second communication device will maintain the existing mapping of codewords to layers with the first communication device. If the capability indication information indicates that the first communication device supports dynamic mapping of codewords to layers, the second communication device will use the above technical solution to maintain dynamic mapping of codewords to layers with the first communication device.
  • the first communication device sends a second indication parameter to the second communication device, and the first indication parameter sent by the second communication device to the first communication device may be the second indication parameter, or may not be the second indication parameter. .
  • This step may occur before step S210.
  • the first communication device sends the second indication parameter to the second communication device before the second communication device sends the first indication parameter.
  • the first communication device indicates the second indication parameter in the CSI measurement feedback (the second indication parameter may be understood as the indication parameter suggested by the first communication device).
  • the first communication device receives the CSI-RS sent by the second communication device, and indicates the second indication parameter corresponding to the CSI resource in the CSI measurement feedback.
  • the terminal device includes the second indication parameter in the CSI feedback, and the second indication parameter does not correspond to the CSI resource.
  • the first communication device indicates the second indication parameter during data transmission. Specifically, the first communication device receives the downlink data sent by the second communication device, and indicates the second indication parameter in the ACK/NACK. Exemplarily, the first communication device determines the second indication parameter according to the detection performance of DMRS. The first communication device feeds back the second indication parameter in a joint coding manner (for example, "NACK+#X") with a non-acknowledgment mechanism (non acknowledgment, NACK), or in an independent coding manner to feed back the second indication parameter.
  • a joint coding manner for example, "NACK+#X”
  • NACK non-acknowledgment mechanism
  • the first communication device after receiving the first indication parameter, sends first indication information to the second communication device indicating whether the first indication parameter is applicable or needs to be updated; or, after receiving the first indication parameter, the first communication device After the first indication parameter, the second indication information including the second indication parameter is sent to the second communication device.
  • the first communication device determines whether the first indication parameter is appropriate based on the detection performance of DMRS.
  • the first communication device may use a joint encoding method with the NACK mechanism (such as: NACK+applicable; or NACK+not applicable) to send the first indication information to the second communication device to indicate whether the first indication parameter is applicable or whether it needs to be updated,
  • the first indication information indicating whether the first indication parameter is applicable or needs to be updated may also be sent to the second communication device in an independent coding manner.
  • the second communication device sends the third indication parameter again based on the first indication information or the second indication information.
  • the correspondence relationship in the embodiment of the present application can be adjusted according to the interleaving scheme, such as the first indication parameter, the correspondence relationship between the first indication parameter and the mapping of codewords to layers, the mapping of codewords to layers, and so on.
  • the interleaving scheme can be inter-codeword interleaving, intra-codeword interleaving, etc.
  • the embodiment of the present application can improve communication performance through the interleaving scheme.
  • different first indication parameters correspond to different mappings of codewords to layers.
  • the first communication device receives different first indication parameters and determines the corresponding mapping of codewords to layers according to the received first indication parameters, Therefore, different codeword-to-layer mappings can be flexibly used, which can make the codeword-to-layer mapping used by the first communication device to be flexibly adjusted, and can enable the codeword-to-layer mapping used by the first communication device to be flexibly adjusted. Meet the gradually increasing requirements for transmitting and receiving antennas in MIMO systems.
  • the embodiments of the present application can dynamically adjust and/or indicate the mapping of codewords to layers.
  • a terminal device can use different mappings of codewords to layers at different times.
  • different terminal devices can use different mappings of codewords to layers at the same time.
  • Different codewords to layer mappings can be used at each time. Therefore, in scenarios where performance differences between streams between terminal devices are large or between streams at different times, different codewords can be used to map to layers.
  • Mapping can also support the transmission of more streams, so that the mapping of codewords to layers can meet the needs of the MIMO system's gradually increasing transceiver antenna size. For example, it can support the transmission of more layers, and the terminal equipment can replace the codewords. Mapping to layers and so on.
  • the terminal device can directly determine the correspondence between the first indication parameter and the mapping of the codeword to the layer based on the first indication parameter, without the need for the network device to indicate the corresponding relationship. In this way, the network device only needs to dynamically indicate the first indication parameter. , compared with directly dynamically indicating the mapping of codewords to layers, the embodiments of this application can effectively reduce signaling overhead.
  • Figure 3 is an interactive flow chart of a communication method in an embodiment of the present application.
  • Method #300 shown in Figure 3 is an implementation method in which the terminal device determines the corresponding relationship between the channel characteristic value threshold and the mapping of the codeword to the layer based on the channel characteristic value threshold, and then determines the mapping of the codeword to the layer. This implementation does not require The corresponding relationship is predefined or indicated by the network device.
  • This method #300 includes:
  • S310 The network device determines the channel characteristic value.
  • one flow corresponds to one channel characteristic value.
  • the channel characteristic value is used to characterize the channel quality of the flow. For example, the larger the channel characteristic value of a flow is, the better the channel quality of the flow is.
  • the terminal device reports the channel characteristic value of the flow and/or the relevant parameters describing the changing relationship of the channel characteristic value of the flow to the network device.
  • the network device receives the channel characteristic value of the flow reported by the terminal device. and/or related parameters that describe the changing relationship of the channel characteristic value of the flow, thereby determining the channel characteristic value.
  • the network device uses the channel H between the network device and the terminal device to obtain the channel characteristic value of the flow.
  • the network device performs singular value decomposition (SVD) decomposition on the channel H of the network device and the terminal device to obtain n channel characteristic values corresponding to n streams, where n ⁇ min ⁇ H Number, number of columns of H ⁇ .
  • SVD singular value decomposition
  • the network device selects n flows from min ⁇ number of rows of H, number of columns of H ⁇ flows, and the selection rules can be determined in a predefined manner.
  • the selection rule #P may include selecting n flows with the largest channel characteristic values, or selecting n flows with channel characteristic values greater than or equal to a certain channel characteristic value threshold, etc.
  • S320 The network device determines the channel characteristic value threshold #A.
  • the network device selects the channel characteristic value threshold #A (can be understood as the first indication parameter) from at least two candidate values among the channel characteristic value thresholds (can be understood as the indication parameter) based on the criterion #Q.
  • criterion #Q may refer to optimal performance of the terminal device, minimum signaling overhead, etc.
  • the channel characteristic value threshold #A has a corresponding relationship with the mapping of codewords to layers.
  • the candidate values for the channel eigenvalue threshold (dB) are ⁇ 5, 10 ⁇ , the channel eigenvalue threshold (dB) is 5, and the corresponding codeword to layer mapping is #A1, as shown in Table 7;
  • Channel eigenvalue threshold (dB) is 10, and the mapping of the corresponding codeword to the layer is #B1, as shown in Table 8.
  • #A is 10.
  • the network device determines the channel characteristic value threshold #A based on the channel characteristic value threshold #A. and the mapping of codewords to layers, and then determine the mapping of codewords to layers corresponding to the channel characteristic value threshold #A.
  • the specific process by which the network device determines the correspondence between the channel characteristic value threshold #A and the mapping of codewords to layers is the same as the terminal device's determination of the correspondence between the channel characteristic value threshold #A and the mapping of codewords to layers described later (S350).
  • S350 the process of correspondence. I won’t go into details here.
  • the network device sends the channel characteristic value threshold #A to the terminal device.
  • the terminal device receives the channel characteristic value threshold #A sent by the network device.
  • the network device may send the channel characteristic value threshold #Y to the first communication device through high-layer signaling or physical layer signaling.
  • the network device may indicate the channel characteristic value threshold #A through the implementation manner in the foregoing embodiments, which will not be described again here.
  • the network device can send the channel characteristic value threshold #A to the terminal device in at least one of data transmission, CSI feedback, and encoding and decoding, or can also send the channel characteristic value threshold #A to the terminal device in other communication processes.
  • data transmission may include: data reception and/or data transmission.
  • the channel characteristic value threshold #A can be applied to one terminal device, that is, one terminal device can use one channel characteristic value threshold #A.
  • the channel characteristic value threshold #A can also be applied to multiple terminal devices, that is, multiple terminal devices can share one channel characteristic value threshold #A.
  • the channel characteristic value threshold #A can also be applied to all terminal devices in a cell.
  • S340 The terminal device determines the channel characteristic value.
  • the terminal device can execute S330 and S340 at the same time, or it can execute S330 first, and then execute S340, or it can execute S340 first, and then execute S330. This is not limited by the embodiments of this application.
  • the terminal device uses the channel H' between the network device and the terminal device to obtain the channel characteristic value of the flow. For example: the terminal device performs SVD decomposition on the channel H′ of the network device and the terminal device, and obtains n channel characteristic values corresponding to n streams, where n ⁇ min ⁇ the number of rows of H′, the number of columns of H′ ⁇ .
  • the terminal device selects n streams from the min ⁇ number of rows of H′, number of columns of H′ ⁇ streams, and the selection rules can be determined in a predefined manner/instructed by the network device to the terminal device.
  • the selection rules may include selecting n flows with the largest channel characteristic values, or selecting n flows with channel characteristic values greater than or equal to a certain channel characteristic value threshold, etc.
  • the channel characteristic values determined by the terminal equipment and the network equipment are the same, or H' and H are the same.
  • S350 The terminal device determines the corresponding relationship between the channel characteristic value threshold #A and the mapping of codewords to layers based on the channel characteristic value threshold #A.
  • the terminal device determines the corresponding relationship between the channel characteristic value threshold (dB) #A and the mapping of codewords to layers based on the following steps.
  • S350#A determine the difference between each channel characteristic value and the maximum channel characteristic value.
  • the terminal device sorts the n channel characteristic values determined in S340 in order from large to small (or from small to large).
  • the sorting result is expressed as:
  • the terminal device After the terminal device determines the maximum channel characteristic value e max among the n channel characteristic values, it then determines the difference between each channel characteristic value and the maximum channel characteristic value. This difference is expressed as:
  • Table 6 exemplifies the difference between each of the n channel characteristic values and the maximum channel characteristic value. See Table 6 for details.
  • n 32 and the channel characteristic value of the flow with flow identifier 0 is the maximum channel characteristic value.
  • the value shown in the second column of Table 6 represents the difference between the channel characteristic value of the flow corresponding to each flow identifier and the channel characteristic value of the flow with flow number 0.
  • the unit of difference is dB.
  • the difference can also be understood as the energy difference between each channel characteristic value and the maximum channel characteristic value.
  • mapping relationship between each codeword and the layer is as follows, which can also be understood as: the mapping relationship between the qth codeword and the layer is as follows:
  • the terminal device determines the corresponding relationship between each channel characteristic value threshold and the mapping of codewords to layers.
  • a channel feature value threshold corresponds to a mapping of codewords to layers.
  • Table 7 exemplifies the mapping of codewords to layers corresponding to a channel characteristic value threshold (dB) of 5.
  • Table 8 exemplifies the mapping of codewords to layers corresponding to a channel characteristic value threshold (dB) of 10.
  • the third column in Table 7 or Table 8 can be obtained, that is, the codeword to layer mapping 1.
  • the fourth column has a corresponding relationship with the third column.
  • the fourth column can be deduced from the third column, that is, the codeword to Layer mapping 2.
  • the corresponding relationship can be referred to Table 2 or Table 3, which will not be described again below.
  • Table 7 The mapping of codewords to layers corresponding to the channel eigenvalue threshold (dB) of 5
  • Table 8 The mapping of codewords to layers corresponding to the channel eigenvalue threshold (dB) of 10
  • S360 The terminal device determines the mapping of codewords to layers based on the channel characteristic value threshold #A and the corresponding relationship.
  • the terminal device determines the mapping of the codeword corresponding to the channel characteristic value threshold #A to the layer based on the corresponding relationship between the channel characteristic value threshold #A, the channel characteristic value threshold #A, and the mapping of the codeword to the layer.
  • the corresponding relationship between the channel characteristic value threshold #A determined by the terminal device and the mapping of codewords to layers is consistent with the corresponding relationship between the channel characteristic value threshold #A determined by the network device and the mapping of codewords to layers. Specifically, it can be done in the following ways:
  • TDD system The network device instructs the terminal device to use the channel characteristic value of the flow of the reference time channel as the channel characteristic value for determining the mapping of codewords to layers. In this way, it can be ensured that the channel characteristic value used by the terminal device is consistent with the channel characteristic value used by the network device.
  • FDD system downlink transmission The terminal device feeds back the channel characteristic values of each flow to the network device. In this way, it can be ensured that the channel characteristic value used by the terminal device is consistent with the channel characteristic value used by the network device.
  • the terminal equipment can use the same codeword-to-layer mapping as the FDD system downlink transmission.
  • the terminal device sends capability indication information to the network device, where the capability indication information is used to indicate whether the terminal device supports dynamic mapping of codewords to layers.
  • the network device will maintain the existing mapping of codewords to layers with the terminal device. If the capability indication information indicates that the terminal device supports dynamic mapping of codewords to layers, the network device will use the above technical solution to maintain dynamic mapping of codewords to layers with the terminal device.
  • the terminal device sends first indication information to the network device indicating whether the first indication parameter is applicable or needs to be updated.
  • the terminal device sends second indication information including the suggested indication parameter to the network device. This can be done by sending the first indication information or the second indication information through the aforementioned implementation method, which will not be described again here.
  • the above technical solution realizes mapping multiple streams with similar channel characteristic values to the same codeword by setting the channel characteristic value threshold.
  • the allocation result is the maximum between the channel characteristic values of any two streams in the same codeword. The difference does not exceed the set channel characteristic value threshold.
  • the embodiment of the present application can make the modulation coding scheme (MCS) value set based on the codeword be compared with the MCS value of each stream corresponding to the codeword. close, which can reduce the performance loss of MIMO systems.
  • MCS modulation coding scheme
  • the value of the channel characteristic value threshold can be changed.
  • the embodiment of the present application adjusts the value of the channel characteristic value threshold, so as to achieve a balance between the capacity performance and signaling overhead of the MIMO system. For example, the larger the channel characteristic value threshold, the smaller the capacity and the smaller the overhead; The smaller the channel characteristic value threshold, the greater the capacity and the greater the overhead.
  • the terminal device determines the channel characteristic value by itself, and determines the channel characteristic value threshold and the mapping of the codeword to the layer based on the channel characteristic value threshold sent by the network device to the terminal device. The corresponding relationship between them is determined, and then the mapping of the codeword corresponding to the channel characteristic value threshold to the layer is determined.
  • the terminal device may not It is necessary to determine the channel characteristic value, directly based on the corresponding relationship sent by the network device to the terminal device or the corresponding relationship predefined by the protocol, and determine the corresponding codeword to layer mapping based on the channel characteristic value threshold sent by the network device to the terminal device,
  • the channel characteristic value threshold sent by the network device to the terminal device
  • the embodiment of the present application maps multiple streams with similar channel characteristic values to the same codeword, and maps multiple streams with dissimilar channel characteristic values to different codewords. In this way, the signaling overhead can be effectively reduced. .
  • the embodiments of the present application can effectively improve the system capacity of the MIMO system.
  • the embodiments of the present application can support any number of stream transmissions and can support dynamic mapping of codewords to layers.
  • Different terminal devices can flexibly and dynamically adjust the mapping of codewords to layers according to the channel characteristic value threshold of the flow at different times.
  • embodiments of the present application can improve system capacity.
  • Embodiments of the present application can also change the value of the channel characteristic value threshold to achieve a balance between the capacity performance and signaling overhead of the MIMO system to meet the requirements of the increasingly developing MIMO system.
  • the terminal device can determine the corresponding relationship between the channel characteristic value threshold and the mapping of the codeword to the layer according to the channel characteristic value threshold, without requiring the network device to indicate or predefine the corresponding relationship.
  • Network devices only need to dynamically indicate channel characteristic value thresholds. Compared with directly dynamically indicating the mapping of codewords to layers, the embodiments of the present application can effectively reduce signaling overhead.
  • the embodiments of the present application can improve the system capacity. Compared with the method of directly dynamically indicating the mapping relationship between codewords and layers, the embodiment of the present application dynamically indicates the channel characteristic value threshold, which can effectively reduce signaling overhead.
  • Method #300 in the embodiment of this application describes using the channel characteristic value threshold as the first indication parameter, but the first indication parameter may also be a signal power threshold, a signal energy threshold, a reference signal received power threshold, or a signal-to-noise ratio threshold. , signal-to-interference-to-noise ratio threshold.
  • the channel characteristic value threshold in the scheme can be replaced by signal power threshold, signal energy threshold, reference signal received power threshold, signal-to-noise ratio threshold, signal-to-interference-to-noise ratio threshold, and the channel characteristic value can be replaced by signal power, signal energy, reference signal Received power, signal-to-noise ratio, signal-to-interference-to-noise ratio. Therefore, for the above-mentioned technical solutions related to the first indication parameter, reference may be made to the content shown in method #300, and the embodiments of this application will not elaborate further.
  • mapping of codewords to layers may also include a specific row or column in the mapping table of codewords to layers. Therefore, the corresponding relationship between the first indication parameter and the mapping of codewords to layers can be understood as:
  • An indication parameter has a corresponding relationship with a specific row or column in the mapping table from codewords to layers (the mapping table is Table 7).
  • the channel characteristic value threshold (dB) is 5 corresponding to the third row of Table 7
  • the channel characteristic value threshold (dB) is 10 corresponding to the fourth row of Table 7, etc.
  • Figure 4 is an interactive schematic diagram of yet another communication method in an embodiment of the present application.
  • Method #400 shown in Figure 4 is to implement dynamic indication codeword to layer mapping based on channel characteristic value thresholds and layer identifiers. Specifically, the terminal device determines the mapping of the corresponding codeword to the layer based on the channel characteristic value threshold and the layer identifier. This implementation does not need to predefine the corresponding relationship between the channel characteristic value threshold, the layer identifier and the mapping of the codeword to the layer or by The network device indicates the correspondence between the channel characteristic value threshold, the layer identifier, and the mapping of codewords to layers.
  • This method #400 includes:
  • S410 The network device determines the channel characteristic value.
  • a combination parameter includes a channel characteristic value threshold #U and a layer identifier #U.
  • the layer identifier may include at least one of the following: a starting layer identifier or an ending layer identifier, and so on.
  • the layer identifier is any positive integer less than or equal to the maximum supported number of layers.
  • this embodiment of the present application uses the starting layer identifier as an example to describe the technical solution, but other expression forms are not limited.
  • the technical solution of the embodiment of the present application is described based on the termination layer identifier.
  • the network device selects the combination parameter #U from the candidate values of the combination parameter based on the criterion #Q.
  • Criterion #Q may refer to the optimal performance of the terminal device, the minimum signaling overhead, etc.
  • the combination parameter #U has a corresponding relationship with the mapping of codewords to layers.
  • the candidate values of the combination parameter are ⁇ channel characteristic value threshold (dB) is 10 and layer identification is 0, channel characteristic value threshold (dB) is 10 and layer identification is 8 ⁇ , where the combination parameter #A (channel characteristic value The threshold (dB) is 10 and the layer identifier is 0) and the corresponding codeword to layer mapping is #A, and the combination parameter #U (the channel characteristic value threshold (dB) is 10 and the layer identifier is 8) corresponds to the codeword to layer mapping. for #B.
  • the network device determines the correspondence between the combination parameter #U and the mapping of the codeword to the layer based on the combination parameter #U, and then determines the mapping of the codeword to the layer corresponding to the combination parameter #U.
  • the specific process by which the network device determines the correspondence between the combination parameter #U and the mapping of codewords to layers is the same as the process by which the terminal device determines the correspondence between the combination parameter #U and the mapping of codewords to layers described later (S450). , which will not be described in detail here.
  • S430 The network device sends the combined parameter #U to the terminal device.
  • the terminal device receives the combined parameter #U sent by the network device.
  • the combined parameter #U indicated by the network device to the terminal device may separately indicate the channel characteristic value threshold #A and the layer identification #R, or may jointly indicate the channel characteristic value threshold #A and the layer identification #R.
  • the network device may send the combined parameter #U to the terminal device through high-layer signaling or physical layer signaling.
  • the network device may indicate the combination parameter #U through the implementation method in the foregoing embodiments, which will not be described again here.
  • the network device can send the combined parameter #U to the terminal device in at least one of data transmission, CSI feedback, and codec, or can also send the combined parameter #U to the terminal device in other communication processes.
  • data transmission may include: data reception and/or data transmission.
  • One possible implementation method is that the combination parameter #U can be applied to one terminal device, that is, one terminal device can use one combination parameter #U.
  • the combination parameter #U can also be applied to multiple terminal devices, that is, multiple terminal devices can share one combination parameter #U.
  • the combination parameter #U can also be applied to all terminal devices in a cell.
  • the above implementation method may indicate the combination parameter #U through the implementation method of the previous embodiment, which will not be described again here.
  • S440 The terminal device determines the channel characteristic value.
  • the terminal device can execute S430 and S440 at the same time, or it can execute S430 first and S440 later, or it can execute S440 first and S430 first, which is not limited by the embodiments of this application.
  • the terminal device uses the channel H ' between the network device and the terminal device to obtain the channel characteristic value of the flow. For example, the terminal device performs SVD decomposition on the channel H ′ of the network device and the terminal device to obtain n channel characteristic values corresponding to n flows between the #Rth flow to the #R+n-1th flow. . n ⁇ min ⁇ number of rows of H ′ , number of columns of H ′ ⁇ . Among them, the channel characteristic values determined by the terminal equipment and the network equipment are the same, or in other words, H ′ and H are the same.
  • the terminal device determines the correspondence between the combination parameter #U and the mapping of the codeword to the layer based on the combination parameter #U. Specifically, the terminal device determines the channel characteristic value threshold (dB) #A and layer identifier #R and the mapping of codewords to layers based on the following steps: The correspondence between the shots.
  • dB channel characteristic value threshold
  • S450#A determine the difference between each channel characteristic value and the maximum channel characteristic value.
  • step S350#A For details, reference may be made to the description of step S350#A, which will not be described again here.
  • S450#B uses the channel characteristic value threshold to divide n flows into group.
  • step S350#B For details, reference may be made to the description of step S350#B, which will not be described again here.
  • the number of mapped codewords obtained is C n . This can be understood as the number of layers n is mapped to the number of codewords C n .
  • C n card(S n )
  • mapping relationship between each codeword and the layer is as follows, which can also be understood as: the mapping relationship between the qth codeword and the layer is as follows:
  • the terminal device determines the corresponding relationship between each combination parameter and the mapping of codewords to layers.
  • a combination parameter corresponds to a mapping of codewords to layers.
  • Table 9 exemplifies the codeword-to-layer mapping #A1 corresponding to a channel characteristic value threshold (dB) of 10 and a layer identifier of 0.
  • Table 10 exemplifies the codeword-to-layer mapping #B1 corresponding to a channel characteristic value threshold (dB) of 10 and a layer identifier of 8.
  • the third column in Table 9 or Table 10 can be obtained, that is, the codeword to layer mapping 1.
  • the fourth column has a corresponding relationship with the third column.
  • the fourth column can be deduced from the third column, that is, the codeword to Layer mapping 2.
  • the corresponding relationship can be referred to Table 2 or Table 3, which will not be described again below.
  • Table 9 Codeword to layer mapping #A1 corresponding to the channel characteristic value threshold (dB) of 10 and the layer identifier of 0
  • Table 10 Codeword to layer mapping #B1 corresponding to a channel eigenvalue threshold (dB) of 10 and a layer identifier of 8
  • the terminal device determines the mapping of codewords to layers based on the combination parameter #U and the corresponding relationship.
  • the terminal device determines the mapping of the codeword to the layer corresponding to the combination parameter #U based on the combination parameter #U, the correspondence between the combination parameter #U and the mapping of the codeword to the layer.
  • the corresponding relationship between the combination parameters determined by the terminal device and the mapping of codewords to layers is consistent with the corresponding relationship between the combination parameters determined by the network device and the mapping of codewords to layers. Specifically, it can be done in the following ways:
  • TDD system The network device instructs the terminal device to use the channel characteristic value of the flow of the reference time channel as the channel characteristic value for determining the mapping of codewords to layers. In this way, it can be ensured that the channel characteristic value used by the terminal device is consistent with the channel characteristic value used by the network device.
  • FDD system downlink transmission The terminal device feeds back the channel characteristic values of each stream to the network device. In this way, it can be ensured that the channel characteristic value used by the terminal device is consistent with the channel characteristic value used by the network device.
  • the terminal equipment can use the same codeword-to-layer mapping as the FDD system downlink transmission.
  • the terminal device sends capability indication information to the network device, where the capability indication information is used to indicate whether the terminal device supports dynamic mapping of codewords to layers.
  • the network device will maintain the existing mapping of codewords to layers with the terminal device. If the capability indication information indicates that the terminal device supports dynamic mapping of codewords to layers, the network device will use the above technical solution to maintain dynamic mapping of codewords to layers with the terminal device.
  • the terminal device sends indication information to the network device indicating whether the combination parameter #U is applicable or needs to be updated.
  • the terminal device sends a new combination parameter suggestion value #Z to the network device. This can be done by sending indication information or combination parameter suggestions whether it is applicable or needs to be updated through the aforementioned implementation method. value, which will not be described again here.
  • this embodiment of the present application maps multiple streams with similar channel characteristic values to the same codeword by setting a channel characteristic value threshold.
  • the allocation result is between the channel characteristic values of any two streams in the same codeword.
  • the layer identifier is set according to the scheduling information, and the layer identifier is used to adjust the mapping relationship between codewords and layers to improve MIMO system performance.
  • the embodiments of the present application can support any number of transmission layers and can support the dynamic mapping relationship between codewords and layers.
  • Different terminal devices can flexibly and dynamically adjust the mapping relationship between codewords and layers according to the combination parameters at different times.
  • embodiments of the present application can improve system capacity.
  • Embodiments of the present application can achieve a balance between the capacity performance and signaling overhead of the MIMO system by changing the values of the combination parameters.
  • the terminal device can determine the correspondence between the combination parameters and the layer mapping relationship based on the combination parameters without requiring instructions from the network device.
  • Network devices only need to dynamically indicate the combined parameters.
  • the embodiments of the present application can effectively reduce signaling overhead.
  • Embodiments of the present application map multiple streams with similar channel characteristic values to the same codeword, and map multiple streams with dissimilar channel characteristic values to different codewords. In this way, signaling overhead can be effectively reduced. The greater the number of codewords, the greater the signaling overhead. When the signaling overhead is the same, the embodiments of the present application can effectively improve the system capacity of the MIMO system.
  • some terminal devices will schedule the top n streams with the largest channel characteristic values, and some terminal devices will schedule the n streams with channel characteristic values in the middle. If the channel characteristic value difference of the first n streams is much different from the channel characteristic value difference of the middle n streams, all terminal equipment uses the mapping of the codewords corresponding to the first n streams to the layer or the mapping of the codewords corresponding to the middle n streams to the layer. This can reduce system performance.
  • the embodiment of the present application adds a layer identifier, which can be used to indicate the position of n streams in the L stream.
  • the embodiment of the present application can support codewords based on the layer identifier for different terminal devices at different times to the layer. Dynamic adjustment of mapping.
  • the implementation of this application can determine the layer identifier according to the scheduling result of the flow of the terminal device, so as to obtain the mapping of the codeword to the layer that is consistent with the scheduling result, thereby improving the system capacity.
  • the layer identifier shown in Figure 4 can also become an independent first indication parameter.
  • a layer identifier corresponds to a mapping relationship between a codeword and a layer.
  • the network device can flexibly indicate the layer identification according to different channel conditions. Realize dynamically adjusting the mapping of codewords to layers. For specific content, please refer to the foregoing description and will not be repeated here.
  • method #400 describes using the channel characteristic value threshold and layer identifier as the first indication parameter, but the first indication parameter can also be the signal power threshold and layer identifier, the signal energy threshold and layer identifier, Reference signal received power threshold and layer identification, signal-to-noise ratio threshold and layer identification, signal-to-interference-to-noise ratio threshold and layer identification.
  • the channel characteristic value threshold and layer identifier in the solution can be replaced by signal power threshold and layer identifier, signal energy threshold and layer identifier, reference signal received power threshold and layer identifier, signal-to-noise ratio threshold and layer identifier, signal-to-interference-noise ratio
  • the threshold and layer identifier, channel characteristic value and layer identifier are replaced by signal power and layer identifier, signal energy and layer identifier, reference signal received power and layer identifier, signal-to-noise ratio and layer identifier, signal-to-interference-noise ratio and layer identifier. Therefore, for the above-mentioned technical solution related to the first indication parameter, reference may be made to the content shown in method #400, which will not be described again in this embodiment of the present application.
  • the mapping of codewords to layers may also include a specific row or column in the mapping table of codewords to layers. Therefore, the corresponding relationship between the first indication parameter and the mapping of codewords to layers can be understood as:
  • An indication parameter has a corresponding relationship with a specific row or column in the mapping table from codewords to layers (the mapping table is Table 9).
  • the mapping table is Table 9
  • the channel characteristic value threshold (dB) is 10 and the layer identifier is 0 corresponding to the third row
  • the channel characteristic value threshold (dB) is 10 and the layer identifier is 8 corresponding to the fourth row and so on.
  • FIG. 5 is an interactive schematic diagram of another communication method in an embodiment of the present application.
  • This method #500 includes:
  • the terminal device determines the indication parameter #V, which has a corresponding relationship with the mapping of codewords to layers.
  • the terminal device selects the indication parameter #V from the candidate values of the indication parameter based on the criterion #Q (the indication parameter #V can be understood as the indication parameter suggested by the terminal device) for reporting to the network device.
  • criterion #Q may refer to optimal performance of the terminal device, minimum signaling overhead, and so on.
  • the indication parameter #V has a corresponding relationship with the mapping of codewords to layers.
  • the candidate values of the indication parameter are ⁇ #Y, #Z, #V ⁇
  • the indication parameter is #Y, which corresponds to the mapping of codewords to layers #A1
  • the indication parameter is #Z, which corresponds to the mapping of codewords to layers #B1 , indicating that the parameter is #V, corresponding to the mapping of codewords to layers #C1.
  • the foregoing content please refer to the foregoing content and will not be repeated here.
  • S520 The terminal device reports the indication parameter #V to the network device.
  • the network device receives the indication parameter #V.
  • the terminal device reports the indication parameter #V in the CSI measurement feedback.
  • the network device sends CSI-RS to the terminal device, and the terminal device obtains the channel through channel estimation.
  • the terminal device selects the indication parameter #V from the candidate values of the indication parameter based on the criterion #Q for reporting to the network device.
  • the terminal device determines the indication parameter #V, it determines the mapping of the codeword to the layer corresponding to the indication parameter #V based on the correspondence between the indication parameter #V and the mapping of the indication parameter to the codeword to the layer.
  • the terminal device determines the rank indicator. , RI) and precoding matrix (precoding matrix indicator, PMI), and then determine the channel quality indicator (channel quality indicator, CQI).
  • the terminal device can report one or more CQIs on each codeword, which can assist network device scheduling or codeword-to-layer mapping decisions during data transmission, thereby improving communication performance.
  • the terminal device may report the indication parameter #V to the network device during CSI feedback.
  • the terminal device can report RI, PMI, CQI, etc. to the network device.
  • the terminal device reports the indication parameter #V in the physical uplink control channel (physical uplink control channel, PUCCH) or the physical uplink shared channel (physical uplink shared channel, PUSCH).
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the network device determines a first indication parameter, which has a corresponding relationship with the mapping of codewords to layers.
  • the network device selects the first indication parameter from candidate values of the indication parameter.
  • the network device may determine the first indication parameter based on the indication parameter #V reported by the terminal device.
  • the first indication parameter may be the same as the indication parameter #V, or may be different from the indication parameter #V.
  • S540 The network device sends the first indication parameter to the terminal device.
  • the terminal device receives the first indication parameter.
  • the network device may send the first indication parameter to the terminal device through high-layer signaling or physical layer signaling.
  • the network device may indicate the first indication parameter through the implementation manner in the foregoing embodiments, which will not be described again here.
  • the first indication parameter is applicable to one terminal device, that is, one terminal device can use one first indication parameter.
  • the first indication parameter is applicable to multiple terminal devices, that is, multiple terminal devices can share one first indication parameter.
  • the first indication parameter is applicable to all terminal devices in a cell.
  • the above implementation manner may indicate the first indication parameter through the implementation manner in the foregoing embodiments, which will not be described again here.
  • S550 The terminal device determines the correspondence between the first indication parameter and the mapping of codewords to layers.
  • the terminal device can determine the corresponding relationship through the three methods in the aforementioned embodiments, which will not be described again here.
  • S560 The terminal device determines the mapping of codewords to layers according to the first indication parameter and the corresponding relationship.
  • step S230 For details, reference may be made to the foregoing description of step S230, which will not be described again here.
  • method #500 may also include:
  • S570 The terminal device sends the first indication information or the second indication information to the network device.
  • the first indication information is used to indicate whether the first indication parameter is applicable or needs to be updated, and the second indication information includes the indication parameter #Z recommended by the terminal device.
  • the terminal device determines whether the first indication parameter is appropriate based on the detection performance of DMRS.
  • the terminal device can use a joint encoding method with the NACK mechanism to send the first indication information to the network device (for example: NACK+ is applicable; or NACK+ is not applicable) to indicate whether the first indication parameter is applicable or needs to be updated, or it can be independently used.
  • the first indication information used to indicate whether the first indication parameter is applicable or needs to be updated is sent to the network device in an encoding manner.
  • the terminal device after receiving the first indication parameter, sends the second indication information including the suggested indication parameter #Z to the network device by encoding it jointly with the non-acknowledgement mechanism (for example: NACK+#Z), or it can The second indication information including the suggested indication parameter #Z is sent to the network device in an independent encoding manner.
  • the non-acknowledgement mechanism for example: NACK+#Z
  • embodiments of the present application can enable the network device to determine the appropriate first indication parameter based on the indication parameter or indication information sent by the terminal device, and the terminal device reports to the network device
  • the reported indication parameter or indication information can influence the network device's codeword-to-layer mapping decision during data transmission, and then the network device can determine the appropriate first indication parameter, thereby improving communication performance.
  • method #500 may also include:
  • S580 The network device sends the third indication parameter to the terminal device.
  • the first indication information or the second indication information reported by the terminal device to the network device can affect the network
  • the device determines the codeword-to-layer mapping during data transmission.
  • the network device can determine the appropriate indication parameter (for example, the third indication parameter) based on the first indication information or the second indication information sent by the terminal device. , thereby improving communication performance.
  • method #500 may include S510 to S580, or may include S510 to S570, or may include S530 to S580, or may include S510 to S560, or may include S530 to S570, etc., in the embodiment of the present application No restrictions.
  • the network device sends CSI-RS to the terminal device, and the terminal device obtains the channel through channel estimation.
  • the network device determines a first indication parameter, and the first indication parameter has a corresponding relationship with the mapping of codewords to layers.
  • the network device sends the first indication parameter to the terminal device.
  • the terminal device determines the first indication parameter, it determines the mapping of the codeword to the layer corresponding to the first indication parameter based on the first indication parameter and the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer, and then the terminal device determines the rank identifier ( rank indicator (RI) and precoding matrix (precoding matrix indicator, PMI), and then determine the channel quality indicator (channel quality indicator, CQI).
  • rank indicator rank indicator
  • precoding matrix indicator precoding matrix indicator
  • CQI channel quality indicator
  • the terminal device can report one or more CQIs on each codeword, which can assist network device scheduling or codeword-to-layer mapping decisions during data transmission, thereby improving communication performance.
  • the terminal device may report the second indication parameter to the network device during CSI feedback.
  • the terminal device can report RI, PMI, CQI, etc. to the network device. In this way, embodiments of the present application can assist network devices in making codeword-to-layer mapping decisions during data transmission, thereby improving communication performance.
  • both the terminal and the network device may include a hardware structure and/or a software module to implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above functions is performed as a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
  • FIG 6 is a schematic diagram of a communication device 600 in an embodiment of the present application.
  • the communication device 600 includes a processor 601 and a communication interface 602.
  • the processor 601 and the communication interface 602 are connected to each other through a bus 603.
  • the communication device 600 shown in Figure 6 may be a network device or a terminal device.
  • the communication device 600 further includes a memory 604.
  • Memory 604 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read only memory (EPROM), or Portable read-only memory (compact disc read-only memory, CD-ROM), the memory 604 is used for related instructions and data.
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable read only memory
  • CD-ROM Compact disc read-only memory
  • the processor 601 may be one or more central processing units (CPUs). When the processor 601 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.
  • CPUs central processing units
  • the processor 601 in the communication device 600 is used to read the computer program or instructions stored in the memory 604. For example, perform the following operations:
  • the communication device 600 When the communication device 600 is a network device, it will be responsible for executing the methods or steps related to the network device in the foregoing method embodiments.
  • the processor 601 in the communication device 600 is used to read the program code stored in the memory 604, and for example, performs the following operations:
  • Receive the first indication parameter which has a corresponding relationship with the mapping of the codeword to the layer; determine the corresponding relationship; determine the mapping of the codeword to the layer according to the first indication parameter and the corresponding relationship.
  • the communication device 600 When the communication device 600 is a terminal device, it will be responsible for executing the methods or steps related to the terminal device in the foregoing method embodiments.
  • FIG. 7 is a schematic diagram of another communication device 700 in an embodiment of the present application.
  • the communication device 700 can be applied to network equipment and can be used to implement the method involved in the above embodiment.
  • the communication device 700 includes a transceiver unit 710 and a processing unit 720.
  • the transceiver unit 710 and the processing unit 720 are exemplarily introduced below.
  • the transceiver unit 710 is used to send the first indication parameter.
  • the processing unit 720 is configured to determine a first indication parameter and determine a correspondence between the first indication parameter and the mapping of codewords to layers.
  • the transceiver unit 710 may also be used to receive indication information or second indication parameters sent by the terminal device.
  • the communication device 700 When the communication device 700 is a network device, it will be responsible for executing the methods or steps related to the network device in the foregoing method embodiments.
  • the communication device 700 further includes a storage unit 730, which is used to store a program or code for executing the foregoing method.
  • the communication device 700 shown in Figure 7 can also be applied to terminal equipment, and can be used to implement the methods involved in the above embodiments.
  • the transceiver unit 710 is used to receive the first indication parameter.
  • the processing unit 720 is configured to determine the corresponding relationship between the first indication parameter and the mapping of the codeword to the layer, and is also used to determine the mapping of the codeword to the layer according to the first indication parameter and the corresponding relationship.
  • the communication device 700 When the communication device 700 is a terminal device, it will be responsible for executing the methods or steps related to the terminal device in the foregoing method embodiments.
  • the device embodiments shown in Figures 6 and 7 are used to implement the contents described in Figures 2 to 5 of the foregoing method embodiments. Therefore, the specific execution steps and methods of the devices shown in Figures 6 and 7 can be referred to the content described in the foregoing method embodiments.
  • FIG. 8 is a schematic diagram of another communication device 800 in an embodiment of the present application.
  • the communication device 800 can be used to implement the functions of the first communication device and the second communication device in the above method.
  • the communication device 800 can be a communication device or a chip in the communication device.
  • the communication device 800 includes: an input and output interface 820 and a processor 810.
  • the input/output interface 820 may be an input/output circuit.
  • the processor 810 can be a signal processor, a chip, or other integrated circuit that can implement the method of the present application. road. Among them, the input and output interface 820 is used for input or output of signals or data.
  • the input and output interface 820 is used to receive the first indication parameter.
  • the input and output interface 820 is used to send the first indication parameter.
  • the processor 810 is configured to execute some or all steps of any method provided by the embodiments of this application.
  • the communication device 800 when the communication device 800 is a first communication device, it is used to perform steps performed by the first communication device in various possible implementations in the above method embodiment.
  • the processor 810 is configured to determine the mapping of the codeword corresponding to the first indication parameter to the layer.
  • the processor 810 is configured to determine a first indication parameter.
  • the processor 810 implements the functions implemented by the first communication device, the second communication device, or the terminal by executing instructions stored in the memory.
  • the communication device 800 also includes a memory.
  • processor and memory are integrated together.
  • the memory is external to the communication device 800 .
  • the processor 810 may be a logic circuit, and the processor 810 inputs/outputs messages or signaling through the input/output interface 820 .
  • the logic circuit may be a signal processor, a chip, or other integrated circuits that can implement the methods of the embodiments of the present application.
  • FIG. 8 The above description of the device in FIG. 8 is only an exemplary description.
  • the device can be used to perform the method described in the foregoing embodiments.
  • An embodiment of the present application also provides a chip, including a processor, configured to call from a memory and run instructions stored in the memory, so that the communication device installed with the chip executes the methods in each of the above examples.
  • An embodiment of the present application also provides another chip, including: an input interface, an output interface, and a processor.
  • the input interface, the output interface, and the processor are connected through an internal connection path.
  • the processor is used to execute the memory. code, and when the code is executed, the processor is used to perform the methods in each of the above examples.
  • the chip also includes a memory for storing computer programs or codes.
  • Embodiments of the present application also provide a processor, coupled to a memory, and used to perform methods and functions involving the first communication device or the second communication device in any of the above embodiments.
  • a computer program product containing instructions is provided.
  • the method of the aforementioned embodiment is implemented.
  • An embodiment of the present application also provides a computer program.
  • the computer program is run in a computer, the method of the foregoing embodiment is implemented.
  • a computer-readable storage medium stores a computer program.
  • the computer program is executed by a computer, the method described in the previous embodiment is implemented.
  • plural means two or more than two.
  • At least one of the following” or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items).
  • at least one of a, b, or c can mean: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple .
  • the term "first”, “second” and other words distinguish the same or similar items with basically the same functions and effects. Those skilled in the art can understand that the words “first”, “second” and other words do not limit the quantity and order of execution. And words such as “first” and “second” are not necessarily different. At the same time, in the embodiments of this application, words such as “exemplarily” or “for example” are used to represent examples, illustrations or explanations.
  • A/B can represent A or B; "and/or” in this application "It is just an association relationship that describes related objects. It means that there can be three relationships.
  • a and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A , B can be singular or plural.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be determined by the implementation process of the embodiments of the present application. constitute any limitation.
  • the size of the sequence numbers of each process does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be determined by the execution order of the embodiments of the present application.
  • the implementation process constitutes no limitation.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • a unit described as a separate component may or may not be physically separate.
  • a component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the units can 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 can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.
  • Functions may be stored in a computer-readable storage medium when implemented in the form of software functional units and sold or used as independent products.
  • the technical solutions of the embodiments of the present application are essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

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Abstract

本申请实施例提供一种通信方法与通信装置，该方法包括：第一通信装置接收第一指示参数，该第一指示参数与第一码字到层的映射具有对应关系；第一通信装置根据第一指示参数确定该第一码字到层的映射。通过该方法，本申请实施例能够动态调整和/或指示码字到层的映射，例如，终端设备可以在不同时刻使用不同的码字到层的映射，又例如，不同终端设备可以在同一时刻可以使用不同的码字到层的映射，因此在终端设备间的流之间性能差异大的场景或者不同时刻间的流之间性能差异大的场景中，可以使用不同的码字到层的映射，同时也可以支持更多流的传输，从而能够满足多输入多输出系统的逐渐增大的收发天线规模的需求。

Description

通信方法与通信装置
本申请要求于2022年4月25提交国家知识产权局、申请号为202210441001.4、申请名称为“通信方法与通信装置”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
本申请实施例涉及通信技术领域，更具体地，涉及一种通信方法与通信装置。
背景技术
多输入多输出(multiple-input multiple-output，MIMO)是第五代(5th generation，5G)通信系统的核心技术，其通过发射端的多个发射天线和接收端的多个接收天线分别进行信号的发射与接收，实现多发多收，改善通信质量。新空口(new radio，NR)通信系统支持MIMO传输，并定义了码字、层等概念。码字与层之间具有映射关系。
为了进一步提升MIMO系统容量，MIMO系统的收发天线规模在不断增大。不断增大的收发天线规模使得MIMO系统可支持的传输流数目和终端设备的数目剧增，单个终端设备的传输流数目也可增加到几十个流。但是现有的码字到层的映射关系不能支持如此高的传输流数目，换言之，现有的码字到层的映射关系无法满足MIMO系统逐渐增大的收发天线规模的需求。
发明内容
本申请实施例提供一种通信方法与通信装置，能够动态调整和/或指示码字到层的映射，例如，终端设备可以在不同时刻使用不同的码字到层的映射，又例如，不同终端设备可以在同一时刻使用不同的码字到层的映射，因此在终端设备间的流之间性能差异大的场景或者不同时刻间的流之间性能差异大的场景中，可以使用不同的码字到层的映射，同时也可以支持更多流的传输，从而可以使得码字到层的映射能够满足MIMO系统逐渐增大的收发天线规模的需求。
第一方面，提供了一种通信方法，包括：第一通信装置接收第一指示参数，该第一指示参数与第一码字到层的映射具有对应关系；该第一通信装置根据该第一指示参数确定该第一码字到层的映射。
具体地，不同的第一指示参数对应不同的码字到层的映射，第一通信装置通过接收不同的第一指示参数，并根据接收的第一指示参数确定对应的第一码字到层的映射，从而能够灵活使用不同的码字到层的映射，这可以使得第一通信装置所使用的码字到层的映射处于灵活调整中，从而可以使得第一通信装置所使用的码字到层的映射关系能够满足MIMO系统逐渐增大的收发天线规模的需求。
可以理解的是，前述的码字到层的映射可以包括码字到层的映射表格，也可以包括码字到层的映射表格中具体的某行或者某列，因此，第一指示参数与第一码字到层的映射具 有对应关系可以理解为：第一指示参数与第一码字到层的映射表格之间的具有对应关系，也可以理解为：第一指示参数与第一码字到层的映射表格中具体的某行或者某列具有对应关系。本申请实施例不限定对第一指示参数与第一码字到层的映射之间具有对应关系的理解。
通过上述技术方案，本申请实施例能够动态调整和/或指示码字到层的映射，例如，终端设备可以在不同时刻使用不同的码字到层的映射，又例如，不同终端设备可以在同一时刻可以使用不同的码字到层的映射，因此在终端设备间的流之间性能差异大的场景或者不同时刻间的流之间性能差异大的场景中，可以使用不同的码字到层的映射，同时也可以支持更多流的传输，从而使得码字到层的映射能够满足MIMO系统逐渐增大的收发天线规模的需求。
结合第一方面，在第一方面的某些实现方式中，该第一指示参数包括以下至少一项：信道特征，业务特性，通信装置能力，或者，调度信息。
具体地，信道特征能够表征流的性能及流间差异，业务特性能够表征通信业务的需求，通信装置能力能够表征通信装置的处理能力，调度信息能够表征通信质量。上述第一指示参数对码字到层的映射关系有显著影响，在终端设备间的上述第一指示参数差异大的场景或者不同时刻间的上述第一指示参数差异大的场景中，可以通过使用不同的码字到层的映射，从而可以提升通信能力。
结合第一方面，在第一方面的某些实现方式中，该信道特征包括以下至少一项：信道特征值阈值，信噪比阈值，天线端口数量，场景，位置，信道径特征，信道时延特征，或者，频谱。
结合第一方面，在第一方面的某些实现方式中，该业务特性包括以下至少一项：覆盖性，移动性，时间敏感性，时延性，或者，可靠性。
基于业务特性可以将业务划分为不同的业务类型。业务类型包括至少以下至少一项：增强移动通信，超高可靠性超低时延通信，或者，机器类通信。
结合第一方面，在第一方面的某些实现方式中，该通信装置能力包括以下至少一项：最大支持的码字数目，最大支持的层数目，或者，是否支持码字到层的动态映射。
结合第一方面，在第一方面的某些实现方式中，该调度信息包括以下至少一项：调制方式，码率，传输块大小，或者，层标识。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：该第一通信装置发送第二指示参数。
通过终端设备向网络设备上报第二指示参数，该第二指示参数可以与第一指示参数相同，也可以与第一指示参数不同，本申请实施例可以使得网络设备可以基于终端设备发送的第二指示参数确定合适的第一指示参数，且终端设备向网络设备上报的第二指示参数能够影响网络设备在数据传输时的码字到层映射的决策，继而网络设备能够确定合适的第一指示参数，从而可以提升通信性能。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：第一通信装置发送第一指示信息，该第一指示信息用于指示该第一指示参数是否适用或者该第一指示参数是否需要更新。
通过终端设备向网络设备反馈由网络设备指示的第一指示参数是否合适或者是否需 要更新的指示信息，本申请实施例可以使得网络设备可以基于终端设备发送的指示信息确定合适的第一指示参数，且终端设备向网络设备上报的指示信息能够影响网络设备在数据传输时的码字到层映射的决策，继而网络设备能够确定合适的第一指示参数，从而可以提升通信性能。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：第一通信装置发送第二指示信息，该第二指示信息包括建议的指示参数。
通过终端设备向网络设备上报建议的指示参数，本申请实施例可以使得网络设备可以基于终端设备发送的建议的指示参数确定合适的第一指示参数，且终端设备向网络设备上报的建议的指示参数能够影响网络设备在数据传输时的码字到层映射的决策，继而网络设备能够确定合适的第一指示参数，从而可以提升通信性能。
结合第一方面，在第一方面的某些实现方式中，该第一通信装置根据第一指示参数确定第一码字到层的映射，包括：该第一通信装置根据该第一指示参数确定该第一指示参数与该第一码字到层的映射之间的对应关系；该第一通信装置根据该第一指示参数以及该第一指示参数与该第一码字到层的映射之间的对应关系确定该第一码字到层的映射。
结合第一方面，在第一方面的某些实现方式中，该第一通信装置根据该第一指示参数确定该第一码字到层的映射，包括：该第一通信装置接收该第一指示参数以及该第一指示参数与该第一码字到层的映射之间的对应关系；该第一通信装置根据该第一指示参数以及该第一指示参数与该第一码字到层的映射之间的对应关系确定该第一码字到层的映射。
结合第一方面，在第一方面的某些实现方式中，该第一通信装置根据该第一指示参数确定该第一码字到层的映射，包括：该第一通信装置根据该第一指示参数以及该第一指示参数与该第一码字到层的映射之间的对应关系确定该第一码字到层的映射，其中，该第一指示参数与该第一码字到层的映射之间的对应关系是预定义的。
结合第一方面，在第一方面的某些实现方式中，该第一通信装置接收该第一指示参数，包括：该第一通信装置接收第二通信装置发送的该第一指示参数。
结合第一方面，在第一方面的某些实现方式中，该码字到层的映射为码字标识到层标识的映射，或者，码字数目到层数目的映射。
结合第一方面，在第一方面的某些实现方式中，该第一指示参数的指示信息和该第一指示参数与该第一码字到层的映射之间的对应关系的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第一方面，在第一方面的某些实现方式中，该第一指示参数的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第一方面，在第一方面的某些实现方式中，该第一指示参数与该第一码字到层的映射之间的对应关系的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第一方面，在第一方面的某些实现方式中，该第一指示参数和/或该对应关系的指示信息为高层信令或者物理层信令。
第二方面，提供了一种通信方法，包括：第二通信装置确定第一指示参数，该第一指示参数与第一码字到层的映射具有对应关系；该第二通信装置向第一通信装置发送该第一指示参数。
结合第二方面，在第二方面的某些实现方式中，该第一指示参数包括以下至少一项：信道特征，业务特性，通信装置能力，或者，调度信息。
结合第二方面，在第二方面的某些实现方式中，该信道特征包括以下至少一项：信道特征值阈值，信噪比阈值，天线端口数量，场景，位置，信道径特征，信道时延特征，或者，频谱。
结合第二方面，在第二方面的某些实现方式中，该业务特性包括以下至少一项：覆盖性，移动性，时间敏感性，延时性，或者，可靠性。
基于业务特性可以将业务划分为不同的业务类型。业务类型包括至少以下至少一项：增强移动通信，超高可靠性超低时延通信，或者，机器类通信。
结合第二方面，在第二方面的某些实现方式中，该通信装置能力包括以下至少一项：最大支持的码字数目，最大支持的层数目，或者，是否支持码字到层的动态映射。
结合第二方面，在第二方面的某些实现方式中，该调度信息包括以下至少一项：调制方式，码率，传输块大小，或者，层标识。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：该第二通信装置向该第一通信装置发送该对应关系。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：该第二通信装置接收该第一通信装置发送的第二指示参数，该第二指示参数与第二码字到层的映射具有对应关系。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：第二通信装置接收第一通信装置发送的第一指示信息，该第一指示信息用于指示该第一指示参数是否适用或者该第一指示参数是否需要更新。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：第二通信装置接收第一通信装置发送的第二指示信息，该第二指示信息包括建议的指示参数。
结合第二方面，在第二方面的某些实现方式中，该码字到层的映射为码字标识到层标识的映射，或者，码字数目到层数目的映射。
结合第二方面，在第二方面的某些实现方式中，该第一指示参数的指示信息和该第一指示参数与该第一码字到层的映射之间的对应关系的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第二方面，在第二方面的某些实现方式中，该第一指示参数的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第二方面，在第二方面的某些实现方式中，该第一指示参数与该第一码字到层的映射之间的对应关系的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第二方面，在第二方面的某些实现方式中，该第一指示参数和/或该对应关系的指示信息为高层信令，或者，物理层信令。
第三方面，提供了一种通信装置，包括：收发单元，用于接收第一指示参数，该第一指示参数与第一码字到层的映射具有对应关系；该处理单元，用于根据该第一指示参数确定该第一码字到层的映射。
结合第三方面，在第三方面的某些实现方式中，该第一指示参数包括以下至少一项： 信道特征，业务特性，通信装置能力，或者，调度信息。
结合第三方面，在第三方面的某些实现方式中，该信道特征包括以下至少一项：信道特征值阈值，信噪比阈值，天线端口数量，场景，位置，信道径特征，信道时延特征，或者，频谱。
结合第三方面，在第三方面的某些实现方式中，该业务特性包括以下至少一项：覆盖性，移动性，时间敏感性，时延性，或者，可靠性。
基于业务特性可以将业务划分为不同的业务类型。业务类型包括至少以下至少一项：增强移动通信，超高可靠性超低时延通信，或者，机器类通信。
结合第三方面，在第三方面的某些实现方式中，该通信装置能力包括以下至少一项：最大支持的码字数目，最大支持的层数目，或者，是否支持码字到层的动态映射。
结合第三方面，在第三方面的某些实现方式中，该调度信息包括以下至少一项：调制方式，码率，传输块大小，或者，层标识。
结合第三方面，在第三方面的某些实现方式中，该收发单元，还用于发送第二指示参数，该第二指示参数与第二码字到层的映射具有对应对应关系。
结合第三方面，在第三方面的某些实现方式中，该收发单元，还用于发送第一指示信息，该第一指示信息用于指示该第一指示参数是否适用或者该第一指示参数是否需要更新。
结合第三方面，在第三方面的某些实现方式中，该收发单元，还用于发送第二指示信息，该第二指示信息包括建议的指示参数。
结合第三方面，在第三方面的某些实现方式中，该处理单元，用于根据该第一指示参数确定该第一指示参数与该第一码字到层的映射之间的对应关系；该处理单元，还用于根据该第一指示参数以及该第一指示参数与该第一码字到层的映射之间的对应关系确定该第一码字到层的映射。
结合第三方面，在第三方面的某些实现方式中，该收发单元，用于接收该第一指示参数与该第一码字到层的映射之间的对应关系；该处理单元，还用于根据该第一指示参数以及该第一指示参数与该第一码字到层的映射之间的对应关系确定该第一码字到层的映射。
结合第三方面，在第三方面的某些实现方式中，该处理单元，还用于根据该第一指示参数以及该第一指示参数与该第一码字到层的映射之间的对应关系确定该第一码字到层的映射，其中，该第一指示参数与该第一码字到层的映射之间的对应关系是预定义的。
结合第三方面，在第三方面的某些实现方式中，该收发单元，还用于接收第二通信装置发送的该第一指示参数。
结合第三方面，在第三方面的某些实现方式中，该码字到层的映射为码字标识到层标识的映射，或者，码字数目到层数目的映射。
结合第三方面，在第三方面的某些实现方式中，该第一指示参数的指示信息和该第一指示参数与该第一码字到层的映射之间的对应关系的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第三方面，在第三方面的某些实现方式中，该第一指示参数的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第三方面，在第三方面的某些实现方式中，该第一指示参数与该第一码字到层的映射之间的对应关系的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指 示信息。
结合第三方面，在第三方面的某些实现方式中，该第一指示参数和/或该对应关系的指示信息为高层信令，或者，物理层信令。
第四方面，提供了一种通信装置，包括：处理单元，用于确定第一指示参数，该第一指示参数与码字到层的映射具有对应关系；收发单元，用于向第一通信装置发送该第一指示参数。
结合第四方面，在第四方面的某些实现方式中，该第一指示参数包括以下至少一项：信道特征，业务特性，通信装置能力，或者，调度信息。
结合第四方面，在第四方面的某些实现方式中，该信道特征包括以下至少一项：信道特征值阈值，信噪比阈值，天线端口数量，场景，位置，信道径特征，信道时延特征，或者，频谱。
结合第四方面，在第四方面的某些实现方式中，该业务特性包括以下至少一项：覆盖性，移动性，时间敏感性，时延性，或者，可靠性。
基于业务特性可以将业务划分为不同的业务类型。业务类型包括至少以下至少一项：增强移动通信，超高可靠性超低时延通信，或者，机器类通信。
结合第四方面，在第四方面的某些实现方式中，该通信装置能力包括以下至少一项：最大支持的码字数目，最大支持的层数目，或者，是否支持码字到层的动态映射。
结合第四方面，在第四方面的某些实现方式中，该调度信息包括以下至少一项：调制方式，码率，传输块大小，或者，层标识。
结合第四方面，在第四方面的某些实现方式中，该收发单元，还用于向该第一通信装置发送该对应关系。
结合第四方面，在第四方面的某些实现方式中，该收发单元，还用于接收该第一通信装置发送的第二指示参数，该第二指示参数与第二码字到层的映射具有对应对应关系。
结合第四方面，在第四方面的某些实现方式中，该收发单元，还用于接收该第一通信装置发送的第一指示信息，该第一指示信息用于指示该第一指示参数是否适用或者该第一指示参数是否需要更新。
结合第四方面，在第四方面的某些实现方式中，该收发单元，还用于接收该第一通信装置发送的第二指示信息，该第二指示信息包括建议的指示参数。
结合第四方面，在第四方面的某些实现方式中，该码字到层的映射为码字标识到层标识的映射，或者，码字数目到层数目的映射。
结合第四方面，在第四方面的某些实现方式中，该第一指示参数的指示信息和该第一指示参数与该第一码字到层的映射之间的对应关系的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第四方面，在第四方面的某些实现方式中，该第一指示参数的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第四方面，在第四方面的某些实现方式中，该第一指示参数与该第一码字到层的映射之间的对应关系的指示信息为用户级指示信息，用户组级指示信息，或者，小区级指示信息。
结合第四方面，在第四方面的某些实现方式中，该第一指示参数和/或该对应关系的指 示信息为高层信令，或者，物理层信令。
第五方面，提供了一种通信装置，包括处理器，该处理器与存储器耦合，该处理器用于执行计算机程序或指令，使得该通信装置执行如第一方面以及第一方面的任一种可能实现方式中任意一项所述的方法；或者，使得该通信装置执行如第二方面以及第二方面的任一种可能实现方式中任意一项所述的方法。
第六方面，提供了一种通信装置，包括逻辑电路和输入输出接口，该逻辑电路用于执行计算机程序或指令，使得该通信装置执行如第一方面以及第一方面的任一种可能实现方式中任意一项所述的方法；或者，使得该通信装置执行如第二方面以及第二方面的任一种可能实现方式中任意一项所述的方法。
第七方面，提供了一种计算机可读存储介质，包括计算机程序或指令，当该计算机程序或该指令在计算机上运行时，使得该计算机执行如第一方面以及第一方面的任一种可能实现方式中任意一项所述的方法；或者，使得该计算机执行如第二方面以及第二方面的任一种可能实现方式中任意一项所述的方法。
第八方面，提供了一种计算机程序产品，包含指令，当该指令在计算机上运行时，使得该计算机执行如第一方面以及第一方面的任一种可能实现方式中任意一项该的方法；或者，使得该计算机执行如第二方面以及第二方面的任一种可能实现方式中任意一项所述的方法。
附图说明
图1为本申请实施例中适用通信系统架构的示意图。
图2为本申请实施例中通信方法的交互示意图。
图3为本申请实施例中一种通信方法的交互示意图。
图4为本申请实施例中又一通信方法的交互示意图。
图5为本申请实施例中另一通信方法的交互示意图。
图6为本申请实施例中通信装置600的示意性框图。
图7为本申请实施例中又一通信装置700的示意性框图。
图8为本申请实施例中另一通信装置800的示意性框图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(global system for mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，Wi-MAX)通信系统、第五代(5th generation，5G)系统或新空口(new radio，NR)、未来第六代(6th generation，6G)系统、星间通信和卫星通信等通信系统。该卫星通信系统包括卫星基站以 及终端设备。该卫星基站为终端设备提供通信服务。卫星基站也可以与基站进行通信。卫星可作为基站，也可作为终端设备。其中，卫星可以是指无人机，热气球，低轨卫星，中轨卫星，高轨卫星等。卫星也可以是指非地面基站或非地面设备等。
本申请实施例对于同构网络与异构网络的场景均适用，同时对于传输点也无限制，可以是宏基站与宏基站、微基站与微基站和宏基站与微基站间的多点协同传输，对FDD/TDD系统均适用。本申请实施例即适用于低频场景(sub 6G)，也适用于高频场景(6GHz以上)，太赫兹，光通信等。本申请实施例不仅可以适用于网络设备和终端的通信，也可以适用于网络设备和网络设备的通信，终端和终端的通信，车联网，物联网，工业互联网等的通信。
本申请实施例中的终端可以是一种具有无线收发功能的设备，具体可以指用户设备(user equipment，UE)、接入终端、用户单元(subscriber unit)、用户站、移动台(mobile station)、远方站、远程终端、移动设备、用户终端、无线通信设备、用户代理或用户装置。终端设备还可以是卫星电话、蜂窝电话、智能手机、无线数据卡、无线调制解调器、机器类型通信设备、可以是无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、高空飞机上搭载的通信设备、可穿戴设备、无人机、机器人、设备到设备通信(device-to-device，D2D)中的终端、车辆外联(vehicle to everything，V2X)中的终端、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端或者5G之后演进的通信网络中的终端设备等，本申请实施例不作限制。
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或者和终端设备匹配使用。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。
本申请实施例中的网络设备具有无线收发功能的设备，用于与终端设备进行通信。接入网设备可以为无线接入网(radio access network，RAN)中的节点，又可以称为基站，还可以称为RAN节点。可以是LTE中的演进型基站(evolved Node B，eNB或eNodeB)；或者gNodeB(gNB)等5G网络中的基站或者5G之后演进的公共陆地移动网络(public land mobile network，PLMN)中的基站，宽带网络业务网关(broadband network gateway，BNG)，汇聚交换机或者第三代合作伙伴项目(3rd generation partnership project，3GPP)接入设备等。
本申请实施例中的网络设备还可以包括各种形式的基站，例如：宏基站、微基站(也称为小站)、中继站、Wi-Fi系统中的接入节点，传输点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、移动交换中心以及设备到设备(device-to-device，D2D)、车辆外联(vehicle-to-everything，V2X)、机器到机器(machine-to-machine，M2M) 通信中承担基站功能的设备等，还可以包括云接入网(cloud radio access network，C-RAN)系统中的集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)、NTN通信系统中的网络设备，本申请实施例不作具体限定。
本申请实施例中用于实现网络设备的功能的装置可以是网络设备，也可以是能够支持网络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网络设备中或者和网络设备匹配使用。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。
图1为本申请实施例中适用通信系统架构的示意图。该通信系统包括终端设备和网络设备。本申请实施例对该通信系统包括的终端设备和网络设备的数量不作限定。图1所示的示意图仅作为示例性描述，不能限定本申请实施例的技术方案实际的应用范围。图1所示的终端设备可以是如上所列举的任意一个终端设备，网络设备也可以是如上所列举的任意一个网络设备。
下文将对本申请实施例的相关技术术语作简单描述。
第一，码字。
码字(codeword，CW)是对在一个传输时间间隔(transmission time interval，TTI)上发送的一个传输块(transmission block，TB)进行循环冗余码校验(cyclic redundancy check，CRC)插入、码块分割并为每个码块插入CRC、信道编码、速率匹配之后得到的数据码流。一个码字与一个传输块相对应。一个码字经过加扰、调制和层映射之后，成为映射到多路并行发送的层(层也可以理解为流)。
第二，码字到层的映射。
码字到层的映射(codeword-to-layer mapping)是用于表征码字与层之间的层映射关系。为了实现空间复用，因此引入“层”实现将码字的调制符号映射到不同的发送层上。层数目等于能够独立并行传输的数据流的数目。码字数量小于或等于层数目，层数目小于或等于发送天线的数量。
3GPP TS 38.211V17.0.0预定义了码字到层的映射的表格，可以见表1。终端设备和网络设备可以通过查表获得码字到层的映射，即将待传输的每个码字的复调制符号映射到一个或几个层上。码字q的复调制符号映射到层x(i)＝[x0(i) … xυ-1(i)]T上，其中，v表示层数，表示每层的调制符号数目。码字q的复调制符号按次序均匀地映射到v个层上。上下行传输均采用预定义的码字到层的映射表格，但是各自支持的最大层数是不同的。下行传输最大支持2个码字和8层。上行传输最大支持1个码字和4层。
表1用于空间复用的码字到层的映射
随着MIMO系统的收发天线规模的逐渐增大，MIMO系统会进一步提升并行传输的数据流数目。MIMO系统可支持的数据流数目可增加到上百个流，可支持的终端设备的数目也在剧增。但是上述码字到层的映射不能支持层数超过4层(上行)/8层(下行)的传输。另外，上述的码字到层的映射是固定的，即对于某一个层数，其能够映射的码字数目是固定的，以及，所有终端设备在所有时刻均采用固定的映射，这会在终端设备间的流之间性能差异大的场景或者不同时刻间的流之间性能差异大的场景下，这会严重影响MIMO系统的系统容量性能。总体而言，现有的码字到层的映射关系无法满足MIMO系统逐渐增大的收发天线规模的需求。
鉴于上述技术问题，本申请实施例提供一种通信方法和通信装置，能够动态调整和/或指示码字到层的映射，例如，终端设备可以在不同时刻使用不同的码字到层的映射，又例如，不同终端设备可以在同一时刻使用不同的码字到层的映射，因此在终端设备间的流之间性能差异大的场景或者不同时刻间的流之间性能差异大的场景中，可以使用不同的码字到层的映射，同时也可以支持更多流的传输，从而可以使得码字到层的映射能够满足MIMO系统逐渐增大的收发天线规模的需求。
下文将结合附图对本申请实施例的通信方法进行描述。
图2为本申请实施例中通信方法的交互示意图。该方法#200包括：
S210，第二通信装置确定第一指示参数，该第一指示参数与码字到层的映射具有对应关系。
在本申请实施例中，对于码字的技术方案的描述可以适用于传输块、编码块或者数据块，比如可以将码字替换为传输块、编码块或者数据块。对于层的技术方案的描述也可以适用于流或者秩，比如可以将层替换为流或秩。码字到层的映射也可以理解为：码字到流的映射、传输块到层的映射、传输块到流的映射、码字数目到层数目的映射，以及，码字标识到层标识的映射等类似表述。
在本申请实施例中，前述的码字到层的映射可以包括码字到层的映射表格，也可以包括码字到层的映射表格中具体的某行或者某列，因此，第一指示参数与码字到层的映射具有对应关系可以理解为：第一指示参数与码字到层的映射表格之间的具有对应关系，也可以理解为：第一指示参数与码字到层的映射表格中具体的某行或者某列具有对应关系，本申请实施例不限定对第一指示参数与码字到层的映射之间具有对应关系的理解。
为便于描述，本申请实施例以第一指示参数与码字到层的映射表格具有对应关系为例进行描述本申请实施例的技术方案，但不排除第一指示参数与码字到层的映射表格(该映射表格可以是现有的表1，也可以是本申请实施例的表2、表3或者其他的表格)中的具体某行或者某列具有对应关系的技术方案，且二者在技术方案方面是相同或者相似的，因此，本申请实施例不过多赘述第一指示参数与码字到层的映射表格中的具体某行或者某列具有对应关系的技术方案，而侧重于描述第一指示参数与码字到层的映射表格之间的对应关系。
具体而言，第二通信装置确定的第一指示参数是第二通信装置从指示参数中确定的，指示参数包括至少2个第一指示参数的候选值。换言之，第二通信装置从指示参数中的多 个候选值中确定第一指示参数。下文将做进一步的描述。
可选地，指示参数可以是预定义的，也可以是第二通信装置向第一通信装置指示的。
一个可能的实现方式，第一指示参数包括以下至少一项：信道特征、业务特性、通信装置能力、或者、调度信息等。
具体地，信道特征能够表征流的性能及流间差异，业务特性能够表征通信业务的需求，通信装置能力能够表征通信装置的处理能力，调度信息能够表征通信质量。上述第一指示参数对码字到层的映射关系有显著影响，在终端设备间的上述第一指示参数差异大的场景或者不同时刻间的上述第一指示参数差异大的场景中，可以通过使用不同的码字到层的映射，从而可以提升通信能力。
具体而言，当第一指示参数包括信道特征时，第一指示参数可以包括信道特征中的至少一项；当第一指示参数包括业务特性时，第一指示参数可以包括业务特性中的至少一项；当第一指示参数包括通信装置能力时，第一指示参数可以包括通信装置能力中的至少一项；当第一指示参数包括调度信息时，第一指示参数可以包括调度信息中的至少一项，下文将对其做具体描述。
例如，信道特征包括以下至少一项：信道特征值阈值、信噪比阈值、天线端口数量、场景、位置、信道径特征、信道时延特征或者频谱，第一指示参数可以包括信道特征值阈值、信噪比阈值、天线端口数量、场景、位置、信道径特征、信道时延特征或者频谱等中的至少一项，指示参数可以包括信道特征值阈值、信噪比阈值、天线端口数量、场景、位置、信道径特征、信道时延特征或者频谱等中的至少一项。业务特性包括以下至少一项：覆盖性、移动性、时间敏感性、传输时延或者可靠性，第一指示参数可以包括覆盖性、移动性、时间敏感性、传输时延或者可靠性等中的至少一项，指示参数可以包括覆盖性、移动性、时间敏感性、传输时延或者可靠性等中的至少一项。通信装置能力包括以下至少一项：最大支持的码字数目、最大支持的层数目或者是否支持码字到层的动态映射，第一指示参数可以包括最大支持的码字数目、最大支持的层数目或者是否支持码字到层的动态映射等中的至少一项，指示参数可以包括最大支持的码字数目、最大支持的层数目或者是否支持码字到层的动态映射等中的至少一项。调度信息包括以下至少一项：调制方式、码率、传输块大小(transport block size，TBS)或者层标识，第一指示参数可以包括调制方式、码率、传输块大小或者层标识等中的至少一项，指示参数可以包括调制方式、码率、传输块大小或者层标识等中的至少一项。
本申请实施例可以基于业务特性将业务划分为不同的业务类型。第一通信装置或者第二通信装置基于业务特性确定码字到层的映射，进一步可以基于业务类型确定码字到层的映射。具体而言，第一指示参数可以包括业务类型。指示参数可以包括业务类型。指示参数可以包括增强移动宽带(enhance mobile broadband，eMBB)、超高可靠性超低时延通信(ultra-reliable and low latency communications，URLLC)或者机器类通信(machine type communication，MTC)等中至少二项。
具体而言，当第一指示参数包括时间敏感性时，第一指示参数可以包括时间敏感性中的至少一项；当第一指示参数包括可靠性时，第一指示参数可以包括可靠性中的至少一项；当第一指示参数包括位置时，第一指示参数可以包括位置中的至少一项；当第一指示参数包括信道径特征时，第一指示参数可以包括信道径特征中的至少一项，下文将对其做具体 描述。
时间敏感性包括以下至少一项：执行时间或者响应时间。具体而言，第一指示参数可以包括执行时间或者响应时间等中的至少一项，指示参数可以包括执行时间或者响应时间等中的至少一项。
可靠性包括以下至少一项：有效性、可用性、准确性、完整性、鲁棒性或者扩展性。第一指示参数可以包括有效性、可用性、准确性、完整性、鲁棒性或者扩展性等中的至少一项，指示参数可以包括有效性、可用性、准确性、完整性、鲁棒性或者扩展性等中的至少一项。
位置包括以下至少一项：第一通信装置的位置、第二通信装置的位置或者第一通信装置与第二通信装置之间的距离、第一通信装置的速度、第二通信装置的速度或者第一通信装置与第二通信装置之间的相对速度等。第一指示参数可以包括第一通信装置的位置、第二通信装置的位置或者第一通信装置与第二通信装置之间的距离、第一通信装置的速度、第二通信装置的速度或者第一通信装置与第二通信装置之间的相对速度等中的至少一项，指示参数可以包括第一通信装置的位置、第二通信装置的位置或者第一通信装置与第二通信装置之间的距离、第一通信装置的速度、第二通信装置的速度或者第一通信装置与第二通信装置之间的相对速度等中的至少一项。
信道径特征可以包括以下至少一项：径数目、径簇数目、径角度分布状态、径簇角度分布状态等。第一指示参数可以包括径数目、径簇数目、径角度分布状态、径簇角度分布状态等中的至少一项，指示参数可以包括径数目、径簇数目、径角度分布状态、径簇角度分布状态等中的至少一项。
信道特征值阈值中的信道特征值是指天线端口上的信道的特征值。信噪比阈值中的信噪比是指天线端口上的信道的信噪比。其中，天线端口的信道可以是没有经过预编码处理或波束赋形的天线端口的信道，也可以是经过预编码处理或波束赋形后的天线端口的信道。
当第一指示参数包括信道特征值阈值时，可以理解为第一指示参数包括信道特征值阈值信号功率阈值、信号能量阈值或者参考信号接收功率(reference signal received power，RSRP)阈值等中至少一项。当指示参数包括信道特征值阈值时，可以理解为指示参数包括信道特征值阈值信号功率阈值、信号能量阈值或者参考信号接收功率(reference signal received power，RSRP)阈值等中至少一项。
当第一指示参数包括信噪比阈值时，可以理解为第一指示参数包括信噪比(signal-to-noise ratio，SNR)阈值或者信干噪比(signal to interference&noise ratio，SINR)阈值等中至少一项。当指示参数包括信噪比阈值时，可以理解为指示参数包括信噪比(signal-to-noise ratio，SNR)阈值或者信干噪比(signal to interference&noise ratio，SINR)阈值等中至少一项。
当第一指示参数包括天线端口数量时，可以理解为第一指示参数包括信道状态信息-参考信号(channel state information reference signal，CSI-RS)资源配置的端口数量、探测参考信号(sounding reference signal，SRS)资源配置的端口数量、解调参考信号(demodulation reference signal，DMRS)资源配置的端口数量、接收天线端口数量、发射天线端口数量、接收最大天线端口数量或者发射最大天线端口数量等中至少一项。当指示参数包括天线端口数量时，可以理解为指示参数包括信道状态信息-参考信号(channel state  information reference signal，CSI-RS)资源配置的端口数量、探测参考信号(sounding reference signal，SRS)资源配置的端口数量、解调参考信号(demodulation reference signal，DMRS)资源配置的端口数量、接收天线端口数量、发射天线端口数量、接收最大天线端口数量或者发射最大天线端口数量等中至少一项。
当第一指示参数包括层标识时，可以理解为第一指示参数包括起始层标识和终止层标识等中至少一项。当指示参数包括层标识时，可以理解为指示参数包括起始层标识或者终止层标识等中至少一项。层标识可以是小于等于最大支持的层数目的任意非负整数。
当第一指示参数包括频段时，可以理解为第一指示参数包括频谱、频带、频点、频段或者频率等中至少一项。当指示参数包括频段时，可以理解为指示参数包括频谱、频带、频点、频段或者频率等中至少一项。
具体而言，当指示参数是传输时延、场景、信道径特征、信道时延特征、调制方式、可靠性、频率、码率中任意一项时，下文将对指示参数包括的候选值做具体描述。当指示参数包括传输时延、场景、信道径特征、信道时延特征、调制方式、可靠性、频率、码率等中至少二项时，指示参数包括的候选值是多项的指示参数包括的候选值的组合，下文不再赘述。
当指示参数是传输时延时，指示参数包括超低传输时延、低传输时延、高传输时延和超高传输时延等中至少二项。指示参数包括(0，0.1]、(0.1ms，3ms]、(3ms，30ms]或者(30ms，∞]等中至少二项。
当指示参数是场景时，指示参数包括室外(outdoor)、室内(indoor)、城区微小区(urban microcell，UMi)、城区宏蜂窝(urban maceocell，UMa)、郊区/农村宏蜂窝(rural macrocell，RMa)、街道(street)、办公室(indoor-office)、工厂(indoor factory，InF)和交通工具(vehicle)等中至少二项。
当指示参数是信道径特征时，指示参数包括包括视距(line of sight，LOS)和非视距(non line of sight，NLOS)等中至少二项。
当指示参数是信道时延特征时，指示参数包括高时延、中时延、低时延和超低时延等中至少二项。例如，高时延为(1000ns，∝]，中时延为(100ns，1000ns]，低时延为(10ns，100ns]，超低时延为(0ns，10ns]。
当指示参数是移动性时，指示参数包括超低移动性、低移动性、高移动性和超高移动性等中至少二项。例如，超低移动性是(0，10km/h]、低移动性是(10km/h，50km/h]、高移动性是(50km/h，200km/h]和超高移动性是(200km/h，∞]等。
当指示参数是调制方式时，指示参数包括正交相移键控(quadrature phase shift keying，QPSK)、64正交振幅调制(quadrature amplitude modulation，QAM)、256QAM或者1024QAM等中至少二项。
当指示参数包括频段(也可以理解为频谱、频带、频点、频段或者频率)时，指示参数包括低频、高频、毫米波和太赫兹等中至少二项。或者，指示参数包括3.5GHz、39GHz或者300GHz等中至少二项。
当指示参数是可靠性，指示参数包括低可靠性、高可靠性和超高可靠性等中至少二项。或者，指示参数包括99.9999999％、99.99999％、99.999％等中至少二项。
当指示参数包括码率，指示参数包括超高码率、高码率、中码率、低码率和超低码率 等中至少两项。或者，指示参数包括(0.8，0.94]、(0.6，0.8]、(0.4，0.6]、(0.2，0.4]或者(0，0.2]等中至少二项。
上述内容仅作为示例性理解，本申请实施例未详细列举所有的可能性。未列举的指示参数可以参考前述已经列举的内容。
示例性地，指示参数包括传输时延、场景、信道径特征、信道时延特征、调制方式、可靠性、频率、码率等时，第一指示参数可以是上述所提及的参数中任一项参数中的具体数值或者类型，例如，指示参数是传输时延时，第一指示参数可以是低传输时延；指示参数是场景时，第一指示参数可以是室外；指示参数是调制方式时，第一指示参数可以是QPSK等。或者，第一指示参数可以是上述所提及的参数中多项参数中的具体数值或者类型的组合，例如，指示参数是传输时延和可靠性时，第一指示参数可以是低传输时延和超高可靠性。
可以理解的是，第一指示参数可以理解为指示参数中的具体某个指示参数。例如，当指示参数是传输时延时，指示参数包括超低传输时延、低传输时延、高传输时延和超高传输时延等中至少二项，第一指示参数可以是低传输时延；当指示参数是场景时，指示参数包括室外(outdoor)、室内(indoor)、城区微小区(urban microcell，UMi)、城区宏蜂窝(urban maceocell，UMa)、郊区/农村宏蜂窝(rural macrocell，RMa)、街道(street)、办公室(indoor-office)、工厂(indoor factory，InF)和交通工具(vehicle)等中至少二项，第一指示参数可以是室外；当指示参数是调制方式时，指示参数包括正交相移键控(quadrature phase shift keying，QPSK)、64正交振幅调制(quadrature amplitude modulation，QAM)、256QAM或者1024QAM等中至少二项，指示参数是调制方式时，第一指示参数可以是QPSK，等等；当指示参数是传输时延和可靠性时，指示参数包括低传输时延和超高可靠性，高传输时延和超高可靠性，低传输时延和低可靠性，高传输时延和低可靠性，第一指示参数可以是低传输时延和超高可靠性。在此做示例性描述，后文不再叙述。
一般而言，指示参数中的不同候选值对应不同的码字到层的映射，换言之，指示参数中不同候选值与码字到层的映射具有不同的对应关系。指示参数中包含至少2个候选值，指示参数与码字到层的映射的对应关系至少有2个，其中包含第一指示参数与码字到层的映射的对应关系。例如，指示参数中的候选值包括{#A，#B}，指示参数与码字到层的映射的对应关系如下：指示参数为#A，其对应码字到层的映射#A1；指示参数为#B，其对应码字到层的映射#B1。码字到层的映射#A1可以是表2中的至少二列或至少二行。码字到层的映射#B1可以是表3中的至少二列或至少二行。第一指示参数为#A，根据上述指示参数与码字到层的映射的对应关系和/或者第一指示参数与码字到层的映射的对应关系可知，其码字到层的映射为#A1。第一通信装置确定指示参数与码字到层的映射的对应关系和/或者第一指示参数与码字到层的映射的对应关系的方式在S230中阐述，此处不再赘述。
如表2或表3所示，第一列是层数目，第二列是码字数目，第三列是码字到层的映射1的描述，第四列是码字到层的映射2的描述。
具体地，第三列描述的是每个码字到层的映射。第四列描述的是每个码字的复调制符号到层的复调制符号的映射。第三列和第四列具有对应关系，可以根据其中一列推导出另一列，具体推导可以参见表2或表3。
表2是指示参数#A对应的码字到层的映射#A1，表3是指示参数#B对应的码字到层 的映射#B1。表2或者表3也可以理解为层数目为n对应的码字到层的映射，1≤n≤L。n个层映射到Cn个码字上，如表中第一列和第二列所示。层标识为[0，1，…，n-1]，码字标识为[0，1，…，Cn-1]。第三列描述的是Cn个码字中每个码字到层标识的映射。码字q映射的层标识为其中，前q+1个码字映射的层数目为 0≤q≤Cn-1。码字q映射的层数目为其中， 0≤q≤Cn-1。第四列描述的是Cn个码字中每个码字的复调制符号到层的复调制符号的映射。码字q的复调制符号映射到层的调制符号上， 是码字q的调制符号总数。
表2采用的是码字q的调制符号均匀平分到个层上，因此每层的调制符号数目为具体地，对码字q的所有调制符号进行分组，每组有个调制符号，共分成个组，每组内调制符号分别映射到个层上。以此方式将各组的调制符号分别映射到各个层上，如下所示：


其中，
可以理解的是，本申请实施例以调制符号均匀分配的方式为例进行描述码字到层的映射，码字到层的映射也可以采用调制符号非均匀的分配方式。比如每个码字的一部分的调制符号只分配到该码字的一部分的层上，另一部分的调制符号只分配到该码字的另一部分的层上。对于表3的描述可以参考表2的描述，在此不赘述。
本申请实施例对指示参数的候选值数目不做限定。本申请实施例以指示参数的候选值数目为2为例描述第一指示参数和码字到层的映射的对应关系，但候选值数目大于2的技术方案也可以参照本申请实施例。
表2指示参数#A对应的码字到层的映射#A1
表3指示参数#B对应的码字到层的映射#B1
示例性地，不同的信道特征值阈值对应不同的码字到层的映射。例如，信道特征值阈值(dB)(可以理解为指示参数)包括{5，10，15，20，…}中至少2个候选值。信道特 征值阈值(dB)为5(可以理解为第一指示参数)，其对应码字到层的映射#A1；信道特征值阈值(dB)为10，其对应码字到层的映射#B1，等等。上述的信道特征值阈值可以理解为信道特征值阈值、信号功率阈值、信号能量阈值或者参考信号接收功率阈值等中一项。
示例性地，不同的信噪比阈值对应不同的码字到层的映射。例如，信噪比阈值(dB)(可以理解为指示参数)包括{5，10，15，20，…}中至少2个候选值。信噪比阈值(dB)为5(可以理解为第一指示参数)，其对应码字到层的映射#A1；信噪比阈值(dB)为10，其对应码字到层的映射#B1，等等。上述的信噪比阈值可以理解为信噪比阈值或者信干噪比阈值等中一项。
示例性地，不同的天线端口数量对应不同的码字到层的映射。例如，天线端口数量(可以理解为指示参数)包括{4，8，16，32，64，128，256，512，1024，…}中至少2个候选值。天线端口数量为64(可以理解为第一指示参数)，其对应码字到层的映射#A1；天线端口数目为1024，其对应码字到层的映射#B1，等等。上述的天线端口数量可以理解为信道状态信息-参考信号(channel state information reference signal，CSI-RS)资源配置的端口数量、探测参考信号(sounding reference signal，SRS)资源配置的端口数量、解调参考信号(demodulation reference signal，DMRS)资源配置的端口数量、接收天线端口数量、发射天线端口数量、接收最大天线端口数量或者发射最大天线端口数量等中一项。
表4示例性地例举了天线端口数量为64对应的码字到层的映射#A1，表5示例性地例举了天线端口数量为1024对应的码字到层的映射#B1。
表4天线端口数量为64对应的码字到层的映射#A1
表5天线端口数量为1024对应的码字到层的映射#B1
可以理解的是，表4和表5所示的是以指示参数为天线端口数量对应的码字到层的映射的示意表格，其他例如场景、位置、距离等内容的指示参数对应的码字到层的映射也可以参考表4或者表5所示的内容，后文不再赘述。
示例性地，不同的场景对应不同的码字到层的映射。例如，场景(可以理解为指示参数)包括{室外，室内，城区微小区，城区宏蜂窝，郊区/农村宏蜂窝，街道、办公室，工厂，交通工具，…}中至少2个候选值。场景为城区微小区(可以理解为第一指示参数)，其对应码字到层的映射#A1；场景为城区宏蜂窝，其对应码字到层的映射#B1；场景为郊区/农村宏蜂窝，其对应码字到层的映射#C1，等等。
示例性地，不同的第一通信装置与第二通信装置之间的距离对应不同的码字到层的映射。例如，第一通信装置与第二通信装置之间的距离(可以理解为指示参数)包括{150m，300m，500m，1000m，…}中至少2个候选值。第一通信装置与第二通信装置之间的距离为150m(可以理解为第一指示参数)，其对应码字到层的映射#A1；第一通信装置与第二通信装置之间的距离为300m，其对应码字到层的映射#B1，等等。
示例性地，不同的信道径特征对应不同的码字到层的映射。例如，信道径特征(可以理解为指示参数)包括{视距，非视距，…}中至少2个候选值。信道径特征是LOS(可以理解为第一指示参数)，其对应码字到层的映射#A1；信道径特征是NLOS，其对应码字到层的映射#B1，等等。
示例性地，不同的信道时延特征对应不同的码字到层的映射。例如，信道时延特征(可以理解为指示参数)包括{高时延，中时延，低时延，超低时延，…}中至少2个候选值，其中，高时延(ns)，中时延(ns)，低时延(ns)，超低时延(ns)还可以用(1000，∝]、(100，1000]、(10，100]、(0，10]进行描述。
具体地，信道时延特征是超低时延(可以理解为第一指示参数)，其对应码字到层的映射#A1；信道时延特征是低时延，其对应码字到层的映射#B1；信道时延特征是中时延，其对应码字到层的映射#C1；信道时延特征是高时延，其对应码字到层的映射#D1，等等。或者，信道时延特征(ns)是(0，10]，其对应码字到层的映射#A1；信道时延特征(ns)是(10，100]，其对应码字到层的映射#B1；信道时延特征(ns)是(100，1000]，其对应码字到层的映射#C1；信道时延特征(ns)是(1000，∝]，其对应码字到层的映射#D1，等等。
示例性地，不同的频谱对应不同的码字到层的映射。例如，频谱(可以理解为指示参数)包括{低频，高频，毫米波，太赫兹，等等}中至少2个候选值。低频(GHz)，高频(GHz)，毫米波(GHz)，太赫兹(GHz)等还可以用3.5，39，300，1000描述。
具体地，频谱是低频(可以理解为第一指示参数)，其对应码字到层的映射#A1；频谱是毫米波，其对应码字到层的映射#B1；频谱是太赫兹，其对应码字到层的映射#C1，等等。又或者，频谱(GHz)是3.5，其对应码字到层的映射#A1；频谱(GHz)是300，其对应码字到层的映射#B1；频谱(GHz)是1000，其对应码字到层的映射#C1，等等。
示例性地，不同的业务类型对应不同的码字到层的映射。例如，业务类型(可以理解为指示参数)包括{eMBB，URLLC，MTC，…}中至少2个候选值。eMBB(可以理解为第一指示参数)对应码字到层的映射#A1，URLLC对应码字到层的映射#B1，MTC对应码字到层的映射#C1，等等。
示例性地，不同的调制方式对应不同的码字到层的映射。例如，调制方式(可以理解 为指示参数)包括{QPSK，64QAM，256QAM，1024QAM，…}中的至少2个候选值。示例性地，QPSK(可以理解为第一指示参数)对应码字到层的映射#A1；64QAM对应码字到层的映射#B1；256QAM对应码字到层的映射#C1；1024QAM对应码字到层的映射#D1，等等。
示例性地，不同的码率对应不同的码字到层的映射。例如，码率(可以理解为指示参数)包括{超高码率，高码率，中码率，低码率，超低码率，…}中至少2个候选值。超高码率，高码率，中码率，低码率，超低码率等还可以用(0.8，0.94]，(0.6，0.8]，(0.4，0.6]，(0.2，0.4]，(0，0.2]进行描述。例如，超高码率(可以理解为第一指示参数)对应码字到层的映射#A1；高码率对应码字到层的映射#B1；中码率对应码字到层的映射#C1；低码率对应码字到层的映射#D1；超低码率对应码字到层的映射#E1，等等。又或者，(0.8，0.94]对应码字到层的映射#A1；(0.6，0.8]对应码字到层的映射#B1；(0.4，0.6]对应码字到层的映射#C1；(0.2，0.4]对应码字到层的映射#D1；(0，0.2]对应码字到层的映射#E1，等等。
示例性地，不同的可靠性业务类型对应不同的码字到层的映射。例如，可靠性(可以理解为指示参数)包括{超高可靠性，高可靠性，中可靠性，低可靠性，超低可靠性，…}中至少2个候选值。其中，超高可靠性，高可靠性，低可靠性等还可以用99.9999999％,99.99999％，99.999％的描述。例如，99.9999999％(可以理解为第一指示参数)对应码字到层的映射#A1；99.99999％对应码字到层的映射#B1，99.999％对应码字到层的映射#C1，等等。超高可靠性对应码字到层的映射#A1；高可靠性对应码字到层的映射#B1，低可靠性对应码字到层的映射#C1，等等。
示例性地，不同的最大支持的码字数目对应不同的码字到层的映射。例如，最大支持的码字数目(可以理解为指示参数)包括{2，4，6，8，…}中至少2个候选值。最大支持的码字数目为2(可以理解为第一指示参数)，对应码字到层的映射关系#A1；最大支持的码字数目为8，对应的码字到层的映射关系#B1，等等。
示例性地，不同的最大支持的层数目对应不同的码字到层的映射。例如，最大支持的层数目(可以理解为指示参数)为{4，8，16，32，…}中的至少2个候选值。最大支持的层数目为4(可以理解为第一指示参数)，对应码字到层的映射关系#A1；最大支持的码字数目为32，对应的码字到层的映射关系#B1，等等。
示例性地，是否支持码字到层的动态映射(可以理解为指示参数)对应不同的码字到层的映射。例如，支持码字到层的动态映射(可以理解为第一指示参数)，对应码字到层的映射关系#A1；不支持码字到层的动态映射，对应码字到层的映射关系#B1。
示例性地，不同的层标识对应不同的码字到层的映射。例如，层标识(可以理解为指示参数)包括{1，2，3，4，…}中至少2个候选值。层标识为1(可以理解为第一指示参数)，对应码字到层的映射关系#A1；层标识为4，对应码字到层的映射关系#B1。上述层标识，可以理解为起始层标识和终止层标识等中一项。
示例性地，不同的移动性对应不同的码字到层的映射。例如，移动性(可以理解为指示参数)包括{超低移动性，低移动性，高移动性，超高移动性，…}中至少2个候选值。超低移动性(km/h)，低移动性(km/h)，高移动性(km/h)，可以用(0，10]，(10，50]，(50，200]，(200，∞]描述。例如，超低移动性(可以理解为第一指示参数)对应码字到层的映射关系#A1；低移动性对应码字到层的映射关系#B1；高移动性对应码字到层的映射关系 #C1；超高移动性，对应码字到层的映射关系#D1，等等。又例如，(0，10]对应码字到层的映射关系#A2；(10，50]对应码字到层的映射关系#B2；(50，200]对应码字到层的映射关系#C2；(200，∞]，对应码字到层的映射关系#D2，等等。
示例性地，不同的传输时延对应不同的码字到层的映射。例如，传输时延(可以理解为指示参数)包括{超高传输时延，高传输时延，低传输时延，超低传输时延，…}中至少2个候选值。超高传输时延(ms)，高传输时延(ms)，低传输时延(ms)，超低传输时延(ms)可以用(0，0.1]，(0.1，3]，(3，30]，(30，∞]的描述。例如，超高传输时延(可以理解为第一指示参数)对应码字到层的映射关系#A1；高传输时延对应码字到层的映射关系#B1；低传输时延对应码字到层的映射关系#C1；超低传输时延，对应码字到层的映射关系#D1，等等。又例如，传输时延是(0，0.1]对应码字到层的映射关系#A2；传输时延是(0.1，3]对应码字到层的映射关系#B2；传输时延是(3，30]对应码字到层的映射关系#C2；传输时延是(30，∞]对应码字到层的映射关系#D2，等等。
一个可能的实现方式中，第一指示参数可以是一个参数，也可以是二个以上的参数。指示参数可以是一个参数，也可以是二个以上的参数。
示例性地，不同的信道特征值阈值和层标识的组合对应不同的码字到层的映射。例如，信道特征值阈值和层标识的组合(可以理解为指示参数)包括{信道特征值阈值(dB)为10和层标识1，信道特征值阈值(dB)为10和层标识9，…}中至少2个候选值。信道特征值阈值(dB)为10和层标识1(可以理解为第一指示参数)，其对应码字到层的映射#A1；信道特征值阈值(dB)为10和层标识9，其对应码字到层的映射#B1，等等。
示例性地，不同的信噪比阈值和层标识的组合对应不同的码字到层的映射。例如，信噪比阈值和层标识的组合(可以理解为指示参数)包括{信噪比阈值(dB)为10和层标识1，信噪比阈值(dB)为10和层标识9，…}中至少2个候选值。信噪比阈值(dB)为10和层标识1(可以理解为第一指示参数)，其对应码字到层的映射#A1；信噪比阈值(dB)为10和层标识9，其对应码字到层的映射#B1，等等。
在上述所列举的各个码字到层的映射中，本申请实施例对码字数目、层数目和指示参数中的候选值数目均不作限定。
上述内容仅作为示例性理解，本申请实施例未详细列举所有的可能性。未列举的其他方式可以参考前述已经列举的内容。
第二通信装置通过将上述任意一项或者多项指示参数与码字到层的映射建立对应关系，该指示参数包括至少2个候选值。第二通信装置确定的第一指示参数是从指示参数中的多个候选值，例如，{#Y，#Z，…}中选出的，如此，第二通信装置就可以基于该第一指示参数实现灵活、动态地调整或者指示码字到层的映射。
S220，第二通信装置向第一通信装置发送第一指示参数。
相应地，第一通信装置接收第二通信装置发送的第一指示参数。
具体地，第二通信装置可以通过高层信令或者物理层信令向第一通信装置发送该第一指示参数。为便于区分和描述，本申请实施例以第二通信装置向第一通信装置发送的第一指示参数为第一指示参#A为例进行说明。
示例性地，第二通信装置可以在数据传输、CSI反馈和编解码中的至少一项中向第一通信装置发送该第一指示参数，也可以在其他的通信流程中向第一通信装置发送第一指示 参数，本申请实施例不做限定。其中，数据传输可以包括：数据接收和/或数据发送。
在本申请实施例中，高层信令可以包括无线资源控制(radio resource control，RRC)信令、媒体接入控制(media access control，MAC)信令、或者其他高层信令等等。物理层信令可以包括下行控制信息(downlink control information，DCI)信令，或者，其他物理层信令，例如，上行控制信息(uplink control information，UCI)等等。
一个可能的实现方式，第一指示参数对应的指示信息可以是用户级指示信息、用户组级指示信息或者小区级指示信息。
具体地，用户级指示信息是指第二通信装置向第一通信装置发送的第一指示参数仅适用于第一通信装置，不适用于其他的第一通信装置。用户组级指示信息是指第二通信装置向第一通信装置发送的第一指示参数不仅适用于第一通信装置，还适用于其他的第一通信装置。小区级指示信息是指第二通信装置向第一通信装置发送的第一指示参数不仅适用于第一通信装置，还适用于与第一通信装置处于同一个小区内的所有其他第一通信装置。
一个可能的实现方式，第二通信装置在半静态RRC信令中配置指示参数中的多个候选值，或者，指示参数中的多个候选值是预定义的，第二通信装置通过动态DCI信令的比特域来指示RRC信令中所配置或者预定义的多个候选值的其中一个，例如，第一指示参数。该DCI信令中用于指示的比特数目可以根据RRC信令中配置的候选值的数量确定。例如，指示参数包括二个候选值：#A和#B，本申请实施例以比特“1”指示#A，以比特“0”指示#B。因此本申请实施例可以使用DCI信令的一个比特用以指示第一指示参数。第一通信装置可以基于该DCI中的比特域确定第二通信装置向第一通信装置发送的第一指示参数。第一通信装置根据该第一指示参数确定该DCI调度的数据的码字到层的映射。本申请实施例通过采用动态的DCI信令，这样可以实时、动态、灵活地调整码字到层的映射，在第一指示参数变化较快的场景下能拥有更好的通信性能。
一个可能的实现方式，第二通信装置可以在RRC信令中配置DCI是否包括用于指示第一指示参数的比特域，第一通信装置根据该指示域确定该DCI是否包括第一指示参数。第二通信装置也可以不在RRC信令中配置该指示域，第一通信装置通过盲检DCI确定其是否包括第一指示参数。
一个可能的的实现方式，第二通信装置在半静态RRC信令中配置指示参数的多个候选值，或者，指示参数的多个候选值是预定义的，第二通信装置通过半静态的RRC信令指示多个候选值的其中一个，例如，第一指示参数。第一通信装置根据该第一指示参数确定码字到层的映射。本申请实施例通过采用半静态的RRC信令，可以半静态地调整码字到层的映射，适用于第一指示参数变化较慢的场景，这可以降低信令开销。
一种可能的的实现方式，第二通信装置向第一通信装置发送的DCI信令可以是组DCI，该组DCI包括多个信息块。一个信息块对应一个第一通信装置。一个第一指示参数可以使用一个或者多个比特进行指示。一个第一通信装置的信息块包括至少一个比特，用于指示第一指示参数，该信息块中包括的DCI比特数量可以根据指示参数中的候选项个数进行确定。第二通信装置可以在RRC信令中为每个第一通信装置配置其对应的信息块在该组DCI中的具体位置。组DCI可以将一组用户的控制信息联合发送，这可以降低控制信令开销，也可以降低控制信道资源开销。
一种可能的实现方式，第一指示参数适用于多个第一通信装置，即多个第一通信装置 可以共用一个第一指示参数。第一通信装置可以在RRC信令中为用户组配置一个组号。一个组号对应一个用户组，一个用户组包括多个第一通信装置。一个用户组对应一个第一指示参数，一个用户组对应一个DCI信息块，在RRC信令中配置该信息块在DCI中的位置。该信息块包括至少一个比特，用于指示第一指示参数，该信息块中包括的DCI比特数量可以根据指示参数中的候选项个数进行确定。第一通信设备根据自身的组号在RRC信令中确定对应的信息块的位置并获得第一指示参数。相比用户级的指示，该实现方式可以显著减少信令开销。
一种可能的实现方式，第一指示参数适用于一个小区内所有第一通信装置。第二通信装置向一个小区内所有第一通信装置广播该第一指示参数。例如，第二通信装置在物理广播信道(physical broadcast channel，PBCH)或者系统信息块(system information block，SIB)或者公共RRC信令中指示第一指示参数。相比用户级的指示或者用户组级的指示，该实现方式可以显著减少信令开销。
一种可能的实现方式，当指示参数包括场景时，第二通信装置提前感知到场景的改变，为使得第一通信装置业务无感知，第二通信装置可以提前向第一通信装置指示场景和生效时刻(是指该场景对应的码字到层的映射生效的时刻)。
一种可能的实现方式，第一通信装置感知到场景发生变化时，可以向第二通信装置反馈场景信息。
在本申请实施例中，第一通信装置可以是终端设备(后文以第一通信装置是终端设备为例进行描述)，第二通信装置可以是网络设备(后文以第二通信装置是网络设备为例进行描述)。因此，S220可以理解为：网络设备向终端设备发送第一指示参数。第一通信装置和第二通信装置也可以都是终端设备，例如，在D2D通信场景中，第一通信装置和第二通信装置都是终端设备。因此，S220也可以理解为：一个终端设备向另一个终端设备发送第一指示参数。在此做统一说明。
为便于描述，本申请实施例以第二通信装置是网络设备为例描述本申请实施例的技术方案，但并不能排除第二通信装置是终端设备的可能性。
综上，S220可以理解为：第一通信装置接收第一指示参数，其中，第一通信装置是终端设备。
S230，第一通信装置根据第一指示参数确定第一码字到层的映射。
具体地，第一通信装置可以根据第一指示参数确定第一码字到层的映射。更为具体地，第一通信装置可以通过确定第一指示参数与第一码字到层的映射之间的对应关系之后再确定第一码字到层的映射。
示例性地，第一通信装置可以通过如下三种方式确定该对应关系：
方式#1：第二通信装置向第一通信装置发送该对应关系；
方式#2：第一通信装置根据该第一指示参数确定该对应关系；
方式#3：该对应关系是预定义的。
对于方式#1，第一通信装置通过第二通信装置发送的第一指示参数以及该对应关系确定码字到层的映射。
对于方式#2，第一通信装置可以根据第二通信装置发送的第一指示参数确定该对应关系，第一通信装置根据第一指示参数确定该对应关系的过程或者规则与第二通信装置根据 第一指示参数确定该对应关系的过程或者规则一致，这可以通过协议预定义的方式将根据第一指示参数确定对应关系的规则在终端设备侧与网络设备侧确定下来，如此，第二通信装置就可以直接向该第一通信装置发送第一指示参数，不需要发送该对应关系，第一通信装置就可以基于该第一指示参数确定码字到层的映射，如此，可以节约信令开销。
对于方式#3，指示参数与码字到层的映射的对应关系采用预定义的方式配置，其中包含第一指示参数与码字到层的映射的对应关系(可以理解为该对应关系)。指示参数中包含至少2个候选值，指示参数与码字到层的映射的对应关系至少有2个。第二通信装置就可以直接向第一通信装置发送第一指示参数，不需要发送该对应关系，第一通信装置就可以基于该第一指示参数确定码字到层的映射，如此，可以节约信令开销。
对于方式#1，一种可能的实现方式，第二通信装置可以通过物理层信令向第一通信装置实时发送第一指示参数与码字到层的映射的对应关系(可以理解为该对应关系)。例如，第二通信装置通过DCI或者组DCI信令向第一通信装置指示该对应关系。
对于方式#1，一种可能的实现方式，第二通信装置可以通过高层信令向第一通信装置发送指示参数与码字到层的映射的对应关系，其中包含第一指示参数与码字到层的映射的对应关系(可以理解为该对应关系)。指示参数中包含至少2个候选值，指示参数与码字到层的映射的对应关系至少有2个。例如，第二通信装置通过半静态的RRC信令向第一通信装置指示指示参数与码字到层的映射的对应关系，其中包含第一指示参数与码字到层的映射的对应关系(可以理解为该对应关系)，第一通信装置可确定该对应关系。与利用动态DCI实时指示该对应关系相比，采用半静态RRC指示指示参数与码字到层的映射的对应关系，可以节约信令开销。
对于方式#1，一种可能的实现方式，第一通信装置对第一指示参数与码字到层的映射的对应关系具有记忆功能。因此，第二通信装置确定该对应关系是否之前已经向第一通信装置指示过，换言之，第一通信装置保存的第一指示参数与码字到层的映射的对应关系与该对应关系是否相同，若是，该对应关系无需再次指示；若否，第二通信装置可以通过物理层信令向第一通信装置发送第一指示参数与码字到层的映射的对应关系(可以理解为该对应关系)，例如，第二通信装置通过DCI或者组DCI信令向第一通信装置指示该对应关系。第一通知装置接收该对应关系，并将其保存。之后，当第一通信装置再次接收到该第一指示参数时，可以直接确定该对应关系，无需第二通信装置指示该对应关系。与利用动态DCI实时指示该对应关系相比，采用此方式，可以节约信令开销。
对于方式#1，该对应关系所对应的指示信息可以是用户级指示信息、用户组级指示信息或者小区级指示信息。
具体地，用户级指示信息是指第二通信装置向第一通信装置发送的该对应关系仅适用于第一通信装置，不适用于其他的第一通信装置。用户组级指示信息是指第二通信装置向第一通信装置发送的该对应关系不仅适用于第一通信装置，还适用于其他的第一通信装置。小区级指示信息是指第二通信装置向第一通信装置发送的该对应关系不仅适用于第一通信装置，还适用于与第一通信装置处于同一个小区内所有其他第一通信装置。方式#1中的用户级、用户组级、小区级的指示方式可以参照前述的第一指示参数的描述。
第一通信装置在获取第一指示参数以及确定该第一指示参数与第一码字到层的映射之间的对应关系之后，可以基于第一指示参数与该第一指示参数与第一码字到层的映射之 间的对应关系确定第一码字到层的映射。
一个可能的实现方式，第一通信装置通过向第二通信装置发送能力指示信息，该能力指示信息用于指示第一通信装置是否支持码字到层的动态映射。该步骤可以发生在S210之前或者S230之前，本申请实施例不作具体限定。
具体地，若该能力指示信息指示第一通信装置不支持码字到层的动态映射，第二通信装置将与第一通信装置保持现有的码字到层的映射。若该能力指示信息指示第一通信装置支持码字到层的动态映射，第二通信装置将使用上述技术方案与第一通信装置保持动态的码字到层的映射。
一个可能的实现方式，第一通信装置向第二通信装置发送第二指示参数，第二通信装置向第一通信装置发送的第一指示参数可以是第二指示参数，也可以不是第二指示参数。该步骤可以发生在步骤S210之前。例如，第一通信装置在第二通信装置发送第一指示参数之前向第二通信装置发送第二指示参数。
例如，第一通信装置在CSI测量反馈中指示第二指示参数(第二指示参数可以理解为是第一通信装置建议的指示参数)。示例性地，第一通信装置接收第二通信装置发送的CSI-RS，并在CSI测量反馈中指示与该CSI资源对应的第二指示参数。又或者，终端设备在CSI反馈中包括第二指示参数，第二指示参数不与该CSI资源对应。
又例如，第一通信装置在数据传输中指示第二指示参数。具体地，第一通信装置接收第二通信装置发送的下行数据，并在ACK/NACK中指示第二指示参数。示例性地，第一通信装置根据DMRS的检测性能确定第二指示参数。第一通信装置采用与非确认机制(non acknowledgement，NACK)联合编码的方式(比如，“NACK+#X”)反馈第二指示参数，也可以采用独立编码的方式反馈第二指示参数。
一个可能的实现方式，第一通信装置在接收到第一指示参数之后，向第二通信装置发送第一指示参数是否适用或者是否需要更新的第一指示信息；或者，第一通信装置在接收到第一指示参数之后，再向第二通信装置发送包括第二指示参数的第二指示信息。
一个可能的实现方式，第一通信装置在接收第一指示参数之后，根据DMRS的检测性能确定第一指示参数是否合适。第一通信装置可以采用与NACK机制联合编码的方式(比如：NACK+适用；或者，NACK+不适用)向第二通信装置发送用于指示第一指示参数是否适用或者是否需要更新的第一指示信息，也可以采用独立编码的方式向第二通信装置发送用于指示第一指示参数是否适用或者是否需要更新的第一指示信息。
一个可能的实现方式中，第二通信装置基于该第一指示信息或者第二指示信息再次发送第三指示参数。
一个可能的实现方式，本申请实施例的对应关系可以根据交织方案进行调整，比如第一指示参数，第一指示参数与码字到层的映射的对应关系、码字到层的映射等等。交织方案可以是码字间交织、码字内交织等。本申请实施例通过交织方案可以使得通信性能提升。
具体地，不同的第一指示参数对应不同的码字到层的映射，第一通信装置通过接收不同的第一指示参数，并根据接收的第一指示参数确定对应的码字到层的映射，从而能够灵活使用不同的码字到层的映射，这可以使得第一通信装置所使用的码字到层的映射处于灵活调整中，可以使得第一通信装置所使用的码字到层的映射能够满足MIMO系统逐渐增大的收发天线规模的需求。
通过上述技术方案，本申请实施例能够动态调整和/或指示码字到层的映射，例如，终端设备可以在不同时刻使用不同的码字到层的映射，又例如，不同终端设备可以在同一时刻可以使用不同的码字到层的映射，因此在终端设备间的流之间性能差异大的场景或者不同时刻间的流之间性能差异大的场景中，可以使用不同的码字到层的映射，同时也可以支持更多流的传输，从而使得码字到层的映射能够满足MIMO系统逐渐增大的收发天线规模的需求，例如，可以支持更多层的传输，终端设备可以更换码字到层的映射等等。
另外，终端设备可以根据第一指示参数直接确定第一指示参数与码字到层的映射之间的对应关系，不需要网络设备指示该对应关系，如此，网络设备只需要动态指示第一指示参数，相比直接动态指示码字到层的映射，本申请实施例可有效降低信令开销。
下文将结合图3至图5对图2的技术方案作进一步的描述。图3至图5的技术方案可以理解是图2的技术方案的支撑，也可以理解是图2的技术方案的其他表述方式。
图3为本申请实施例中一种通信方法的交互流程图。图3所示的方法#300是终端设备根据信道特征值阈值确定信道特征值阈值和码字到层的映射之间的对应关系，继而确定码字到层的映射的实现方式，该实现方式无需预定义该对应关系或者由网络设备指示该对应关系。该方法#300包括：
S310，网络设备确定信道特征值。
具体而言，一个流对应一个信道特征值。信道特征值是用于表征流的信道质量的好坏。例如，流的信道特征值越大，其表示该流的信道质量就越好。
一种可能的实现方式，终端设备向网络设备上报流的信道特征值和/或描述流的信道特征值的变化关系的相关参数等，对应的，网络设备接收终端设备上报的流的信道特征值和/或描述流的信道特征值的变化关系的相关参数，从而确定信道特征值。
一种可能的实现方式，网络设备利用网络设备与终端设备的信道H获得流的信道特征值。例如，网络设备对网络设备与终端设备的信道H进行奇异值分解(singular value decomposition，SVD)分解，获得与n个流一一对应的n个信道特征值，其中，n≤min{H的行数目，H的列数目}。
可选地，网络设备在min{H的行数目，H的列数目}个流中选取n个流，选取规则可以以预定义的方式进行确定。
示例性地，选取规则#P可以包括选择信道特征值最大的n个流，或者，选择信道特征值大于或等于某个信道特征值阈值的n个流等。
S320，网络设备确定信道特征值阈值#A。
具体地，网络设备基于准则#Q从信道特征值阈值(可以理解为指示参数)中的至少二个候选值中选出信道特征值阈值#A(可以理解为第一指示参数)。例如，准则#Q可以是指终端设备的性能最优、信令开销最小等。
信道特征值阈值#A与码字到层的映射具有对应关系。例如，信道特征值阈值(dB)的候选值为{5，10}，信道特征值阈值(dB)为5，对应码字到层的映射为#A1，如表7所示；信道特征值阈值(dB)为10，对应码字到层的映射为#B1，如表8所示。假设#A为10。
一个可能的实现方式中，网络设备基于该信道特征值阈值#A确定信道特征值阈值#A 与码字到层的映射之间的对应关系，继而确定该信道特征值阈值#A对应的码字到层的映射。网络设备确定信道特征值阈值#A与码字到层的映射之间的对应关系的具体过程同后述(S350)的终端设备确定信道特征值阈值#A与码字到层的映射之间的对应关系的过程。在此不再赘述。
S330，网络设备向终端设备发送信道特征值阈值#A。
相应地，终端设备接收网络设备发送的信道特征值阈值#A。
具体地，网络设备可以通过高层信令或者物理层信令向第一通信装置发送该信道特征值阈值#Y。网络设备可以通过前述实施例中的实现方式来指示信道特征值阈值#A，在此不再赘述。
示例性地，网络设备可以在数据传输、CSI反馈和编解码中的至少一项向终端设备发送该信道特征值阈值#A，也可以在其他的通信流程中向终端设备发送信道特征值阈值#A，本申请实施例不做限定。其中，数据传输可以包括：数据接收和/或数据发送。
一个可能的实现方式，信道特征值阈值#A可以适用于1个终端设备，即1个终端设备可以用一个信道特征值阈值#A。
一个可能的实现方式，信道特征值阈值#A也可以适用于多个终端设备，即多个终端设备可以共用一个信道特征值阈值#A。
一个可能的实现方式，信道特征值阈值#A还可以适用于一个小区内的所有终端设备。
S340，终端设备确定信道特征值。
具体地，终端设备可以同时执行S330和S340，也可以先执行S330，再执行S340，也可以先执行S340，再执行S330，本申请实施例不做限定。
一种可能的实现方式，终端设备利用网络设备与终端设备的信道H′获得流的信道特征值。例如：终端设备对网络设备与终端设备的信道H′进行SVD分解，获得与n个流一一对应的n个信道特征值，其中，n≤min{H′的行数目，H′的列数目}。
一个可能的实现方式，终端设备在min{H′的行数目，H′的列数目}个流中选取n个流，选取规则可以以预定义/网络设备指示给终端设备的方式进行确定。
示例性地，选取规则可以包括选择信道特征值最大的n个流，或者，选择信道特征值大于或等于某个信道特征值阈值的n个流等。终端设备和网络设备确定的信道特征值是相同的，或者，H′和H是相同的。
S350，终端设备基于信道特征值阈值#A确定信道特征值阈值#A与码字到层的映射之间的对应关系。
具体地，终端设备基于如下步骤确定信道特征值阈值(dB)#A与码字到层的映射之间的对应关系。
S350#A，确定每个信道特征值与最大信道特征值之间的差值。
示例性地，终端设备对S340确定的n个信道特征值按照由大到小(也可以是由小到大)的顺序进行排序。该排序结果表示为：
e0，e1，…，en-1   (1)
终端设备确定n个信道特征值中最大信道特征值emax之后，再确定每个信道特征值与最大信道特征值之间的差值。该差值表示为：
在公式(1)和(2)中，emax＝e0。
表6示例性地例举了n个信道特征值中每个信道特征值与最大信道特征值之间的差值。具体见表6。
表6每个信道特征值与最大信道特征值之间的差值
表6中，n＝32，流标识为0的流的信道特征值是最大信道特征值。表6中第2列所示的数值表征的是每个流标识对应的流的信道特征值与流编号为0的流的信道特征值之间的差值。差值的单位是dB。差值也可以理解为是每个信道特征值与最大信道特征值之间的能量差值。
S350#B，利用信道特征值阈值#A将n个流分成个组。第qtmp个组包含的流标识记为：
S350#C，去除空集的组，非空集的组标识为
S350#D，获得映射的码字数目为Cn。可以理解为，层数目为n映射到码字数目为Cn。
Cn＝card(Sn)  (5)
S350#E，获得每个码字到层的映射关系。第q个码字包含的层标识如下所示，也可以理解为：第q个码字到层的映射关系如下所示：
基于公式(6)，每个码字(码字0～码字Cn-1)到层的映射关系均可获得。
通过S350，终端设备确定每个信道特征值阈值与码字到层的映射之间的对应关系。换言之，一个信道特征值阈值对应一个码字到层的映射。
示例性地，假设选取规则#P是选择信道特征值最大的n个流，表7示例性地例举了信道特征值阈值(dB)为5对应的码字到层的映射。表8示例性地例举了信道特征值阈值(dB)为10对应的码字到层的映射。根据上述步骤可以获得表7或者表8中的第三列，即码字到层映射1，第四列与第三列有对应关系，通过第三列可推导出第四列，即码字到层的映射2。该对应关系可参照表2或表3，后文不再赘述。
表7信道特征值阈值(dB)为5对应的码字到层的映射


表8信道特征值阈值(dB)为10对应的码字到层的映射


S360，终端设备根据信道特征值阈值#A和该对应关系确定码字到层的映射。
具体地，终端设备根据信道特征值阈值#A、信道特征值阈值#A与码字到层的映射之间的对应关系，确定信道特征值阈值#A对应的码字到层的映射。
终端设备确定的信道特征值阈值#A与码字到层的映射之间的对应关系与网络设备确定的信道特征值阈值#A与码字到层的映射之间的对应关系是一致的。具体可以通过如下方式：
TDD系统：网络设备指示终端设备用参考时刻信道的流的信道特征值作为确定码字到层的映射的信道特征值。如此，可以保证终端设备使用的信道特征值与网络设备使用的信道特征值保持一致。
FDD系统下行传输：终端设备反馈给网络设备各个流的信道特征值。如此，可以保证终端设备使用的信道特征值与网络设备使用的信道特征值保持一致。
FDD系统上行传输：终端设备可采用与FDD系统下行传输相同的码字到层的映射。
可选地，终端设备通过向网络设备发送能力指示信息，该能力指示信息用于指示终端设备是否支持码字到层的动态映射。
具体地，若该能力指示信息指示终端设备不支持码字到层的动态映射，网络设备将与终端设备保持现有的码字到层的映射。若该能力指示信息指示终端设备支持码字到层的动态映射，网络设备将使用上述技术方案与终端设备保持动态的码字到层的映射。
可选地，终端设备向网络设备发送该第一指示参数是否适用或是否需要更新的第一指示信息。或者，终端设备在接收到网络设备发送的第一指示参数之后，向网络设备发送包括建议的指示参数的第二指示信息。这可以通过前述的实现方式发送第一指示信息或第二指示信息，在此不再赘述。
具体地，上述技术方案通过设置信道特征值阈值实现将信道特征值相近的多个流映射到同一个码字，分配结果是同一个码字内的任意二个流的信道特征值之间的最大差值不超过设定的信道特征值阈值，如此，本申请实施例就可以使得基于码字设置的调制编码策略(modulation coding scheme，MCS)值会与该码字对应的各个流的MCS值比较接近，这能够减少MIMO系统的性能损失。
在本申请实施例中，信道特征值阈值的数值是可以改变的。本申请实施例通过对信道特征值阈值的数值进行调整，如此就可以在MIMO系统的容量性能与信令开销之间达成平衡，例如，信道特征值阈值越大，容量越小，开销越小；信道特征值阈值越小，容量越大，开销越大。
另外，在图3所示的方法#300的技术方案中，终端设备自行确定信道特征值，且根据网络设备向终端设备发送的信道特征值阈值确定该信道特征值阈值与码字到层的映射之间的对应关系，继而确定该信道特征值阈值对应的码字到层的映射，但当该对应关系是由网络设备向终端设备发送的或者通过协议预定义的方式确定时，终端设备可以不需要确定信道特征值，直接根据网络设备向终端设备发送的该对应关系或者协议预定义的该对应关系，以及根据网络设备向终端设备发送的信道特征值阈值确定对应的码字到层的映射，具体描述可以参见前述关于S230的描述。该描述同样也适用于后文的内容描述，后文不再 赘述。
通过上述技术方案，本申请实施例将信道特征值相近的多个流映射到同一个码字，将信道特征值不相近的多个流映射到不同码字，如此，就可以有效降低信令开销。码字数目越多，信令开销越大。在信令开销相同时，本申请实施例就够有效提升MIMO系统的系统容量。
另外，本申请实施例可支持任意数目的流传输、可支持码字到层的动态映射。不同终端设备在不同时刻可以根据流的信道特征值阈值灵活、动态地调整码字到层的映射。在不同终端设备间的信道差异大或者终端设备在不同时刻信道差异大的场景下，相比固定的映射关系，本申请实施例可提高系统容量。本申请实施例还可以改变信道特征值阈值的数值，实现在MIMO系统的容量性能与信令开销之间达成平衡，满足日益发展的MIMO系统的要求。
另外，终端设备可以根据信道特征值阈值确定信道特征值阈值与码字到层的映射之间的对应关系，无需通过网络设备指示或者预定义该对应关系。网络设备只需要动态指示信道特征值阈值。相比直接动态指示码字到层的映射，本申请实施例可有效降低信令开销。
在终端设备的信道频繁变换或终端设备的信道差异明显的场景下，相比码字到层的固定映射关系，本申请实施例可提高系统容量。相比直接动态指示码字到层映射关系的方法，本申请实施例动态指示信道特征值阈值，可有效降低信令开销。
本申请实施例中的方法#300描述的是以信道特征值阈值为第一指示参数，但是该第一指示参数也可以是信号功率阈值、信号能量阈值、参考信号接收功率阈值、信噪比阈值、信干噪比阈值。比如可以把方案中的信道特征值阈值替换为信号功率阈值、信号能量阈值、参考信号接收功率阈值、信噪比阈值、信干噪比阈值，信道特征值替换为信号功率、信号能量、参考信号接收功率、信噪比、信干噪比。因此，对于上述所提及的第一指示参数相关的技术方案可以参考方法#300所示的内容，本申请实施例不做过多赘述。
前文提到，码字到层的映射也可以包括码字到层的映射表格中具体的某行或者某列，因此，第一指示参数与码字到层的映射具有对应关系可以理解为：第一指示参数与码字到层的映射表格(该映射表格为表7)中具体的某行或者某列具有对应关系。
示例性地，在表7中，信道特征值阈值(dB)为5对应表7的第三行，信道特征值阈值(dB)为10对应表7的第四行等。关于第一指示参数与码字到层的映射表格中具体的某行或者某列具有对应关系的描述可以参考该所述内容，该所述内容仅作为示例性理解。
图4为本申请实施例中又一种通信方法的交互示意图。图4所示的方法#400是基于信道特征值阈值和层标识实现动态指示码字到层的映射。具体地，终端设备根据信道特征值阈值、层标识确定对应的码字到层的映射，该实现方式无需预定义信道特征值阈值、层标识与码字到层的映射之间的对应关系或者由网络设备指示信道特征值阈值、层标识与码字到层的映射之间的对应关系。该方法#400包括：
S410，网络设备确定信道特征值。
具体描述可以参考S310，在此不再赘述。
S420，网络设备确定组合参数#U，一个组合参数包括一个信道特征值阈值#U与层标识#U。
在本申请实施例中，层标识可以包括以下至少一项：起始层标识或者终止层标识，等等。层标识是小于或等于最大支持的层数目的任意正整数。
为便于描述，本申请实施例以起始层标识为例描述本技术方案，但不限定其他的表述形式，例如，基于终止层标识描述本申请实施例的技术方案。
具体地，网络设备基于准则#Q从组合参数的候选值中选出组合参数#U。例如：准则#Q可以是指终端设备的性能最优、信令开销最小等。组合参数#U与码字到层的映射具有对应关系。例如，组合参数的候选值为{信道特征值阈值(dB)为10和层标识为0，信道特征值阈值(dB)为10和层标识为8}，其中，组合参数#A(信道特征值阈值(dB)为10和层标识为0)对应码字到层的映射为#A，组合参数#U(信道特征值阈值(dB)为10和层标识为8)对应码字到层的映射为#B。
一个可能的实现方式，网络设备基于该组合参数#U确定组合参数#U与码字到层的映射之间的对应关系，继而确定该组合参数#U对应的码字到层的映射。网络设备确定组合参数#U与码字到层的映射之间的对应关系的具体过程同后述(S450)的终端设备确定组合参数#U与码字到层的映射之间的对应关系的过程，在此不再赘述。
S430，网络设备向终端设备发送组合参数#U。
相应地，终端设备接收网络设备发送的组合参数#U。
其中，网络设备向终端设备指示的组合参数#U可以分别指示信道特征值阈值#A和层标识#R，也可以是联合指示信道特征值阈值#A和层标识#R。网络设备可以通过高层信令或者物理层信令向终端设备发送组合参数#U。网络设备可以通过前述实施例中的实现方式来指示组合参数#U，在此不再赘述。
示例性地，网络设备可以在数据传输、CSI反馈和编解码中的至少一项向终端设备发送该组合参数#U，也可以在其他通信流程中向终端设备发送组合参数#U，本申请实施例不做限定。其中，数据传输可以包括：数据接收和/或数据发送。
一个可能的实现方式，组合参数#U可以适用于1个终端设备，即1个终端设备可以用一个组合参数#U。
一个可能的实现方式，组合参数#U也可以适用于多个终端设备，即多个终端设备可以共用一个组合参数#U。
一个可能的实现方式，组合参数#U还可以适用于一个小区内的所有终端设备。
上述的实现方式可以通过前述实施例的实现方式指示组合参数#U，在此不再赘述。
S440，终端设备确定信道特征值。
具体而言，终端设备可以同时执行S430与S440，也可以是S430执行在先，S440执行在后，也可以是S440执行在先，S430执行在先，本申请实施例不做限定。
一种可能的实现方式，终端设备利用网络设备与终端设备的信道H′获得流的信道特征值。例如，终端设备基于对网络设备与终端设备的信道H′进行SVD分解，获得第#R个流到第#R+n-1的流之间的n个流一一对应的n个信道特征值。n≤min{H′的行数目，H′的列数目}。其中，终端设备与网络设备确定的信道特征值是相同的，或者说，H′与H是相同的。
S450，终端设备基于组合参数#U确定组合参数#U与码字到层的映射之间的对应关系。具体地，终端设备基于如下步骤确定信道特征值阈值(dB)#A和层标识#R与码字到层的映 射之间的对应关系。
S450#A，确定每个信道特征值与最大信道特征值之间的差值。
具体可以参考前述步骤S350#A的描述，在此不再赘述。
S450#B，利用信道特征值阈值将n个流分成个组。
具体可以参考前述步骤S350#B的描述，在此不再赘述。
S450#C，去除空集的组，非空集的组标识为
S450#D，获得映射的码字数目为Cn。这可以理解为，层数目为n映射到码字数目为Cn。
Cn＝card(Sn)
S450#E，获得每个码字到层的映射关系。第q个码字包含的层标识如下所示，也可以理解为：第q个码字到层的映射关系如下所示：
通过S450，终端设备确定每个组合参数与码字到层的映射之间的对应关系。换言之，一个组合参数对应一个码字到层的映射。
表9示例性地例举了信道特征值阈值(dB)为10和层标识为0对应的码字到层的映射#A1。表10示例性地例举了信道特征值阈值(dB)为10和层标识为8对应的码字到层的映射#B1。根据上述步骤可以获得表9或者表10中的第三列，即码字到层映射1，第四列与第三列有对应关系，通过第三列可推导出第四列，即码字到层的映射2。该对应关系可参照表2或表3，后文不再赘述。
表9信道特征值阈值(dB)为10和层标识为0对应的码字到层的映射#A1


表10信道特征值阈值(dB)为10和层标识为8对应的码字到层的映射#B1

S460，终端设备根据组合参数#U和该对应关系确定码字到层的映射。
具体地，终端设备根据组合参数#U、组合参数#U与码字到层的映射之间的对应关系，确定组合参数#U对应的码字到层的映射。
终端设备确定的组合参数与码字到层的映射之间的对应关系与网络设备确定的组合参数与码字到层的映射之间的对应关系是一致的。具体可以通过如下方式：
TDD系统：网络设备指示终端设备用参考时刻信道的流的信道特征值作为确定码字到层的映射的信道特征值。如此，可以保证终端设备使用的信道特征值与网络设备使用的信道特征值保持一致。
FDD系统下行传输：终端设备反馈给网络设备各个流的信道特征值。如此，可以保证终端设备使用的信道特征值与网络设备使用的信道特征值保持一致。
FDD系统上行传输：终端设备可采用与FDD系统下行传输相同的码字到层的映射。
可选地，终端设备通过向网络设备发送能力指示信息，该能力指示信息用于指示终端设备是否支持码字到层的动态映射。
具体地，若该能力指示信息指示终端设备不支持码字到层的动态映射，网络设备将与终端设备保持现有的码字到层的映射。若该能力指示信息指示终端设备支持码字到层的动态映射，网络设备将使用上述技术方案与终端设备保持动态的码字到层的映射。
可选地，终端设备向网络设备发送该组合参数#U是否适用或者是否需要更新的指示信息。或者，终端设备在接收到网络设备发送的组合参数#U之后向网络设备发送新的组合参数建议值#Z，这可以通过前述的实现方式发射是否适用或者是否需要更新的指示信息或组合参数建议值，在此不再赘述。
具体而言，本申请实施例通过设置信道特征值阈值实现将信道特征值相近的多个流映射到同一个码字，分配结果是同一个码字内的任意二个流的信道特征值之间的最大差值不超过设定的信道特征值阈值，如此，本申请实施例就可以使得基于码字设置的MCS值会与该码字对应的各个流的MCS值比较接近，这能够减少MIMO系统的性能损失。并根据调度信息来设置层标识，利用层标识来调整码字到层的映射关系，以提升MIMO系统性能。
通过上述技术方案，本申请实施例可支持任意数目的传输层数、可支持码字与层的动态映射关系。不同终端设备在不同时刻可以根据组合参数灵活、动态地调整码字与层的映射关系。在不同终端设备间的信道差异大或者终端设备在不同时刻信道差异大的场景下，相比固定的层映射关系，本申请实施例可提高系统容量。本申请实施例可以通过改变组合参数的数值，实现在MIMO系统的容量性能与信令开销之间达成平衡。
另外，终端设备可以根据组合参数确定组合参数与层映射关系之间的对应关系，无需通过网络设备指示。网络设备只需要动态指示组合参数。相比直接动态指示码字到层的映射，本申请实施例可有效降低信令开销。本申请实施例将信道特征值相近的多个流映射到同一个码字，将信道特征值不相近的多个流映射到不同码字，如此，就可以有效降低信令开销。码字数目越多，信令开销越大。在信令开销相同时，本申请实施例就够有效提升MIMO系统的系统容量。
在多用户MIMO场景下，由于干扰的影响，有的终端设备会调度信道特征值最大的前n流，有的终端设备会调度信道特征值大小处于中间的n流。如果前n流的信道特征值差异与中间n流的信道特征值差异相差很多，所有终端设备均采用前n流对应的码字到层的映射或者中间n流对应的码字到层的映射，这会降低系统性能。
为此，本申请实施例通过增加层标识，其能够用于指示传输n个流在L流中的位置，本申请实施例就可以支持不同时刻、不同终端设备的基于层标识的码字到层的映射的动态调整。本申请实施可以根据终端设备的流的调度结果确定层标识，以获得与调度结果相符的码字到层的映射，从而可提高系统容量。
图4所示的层标识也可以成为一个独立的第一指示参数，例如，一个层标识对应一个码字到层的映射关系。如此，就可以使得网络设备根据信道条件的不同灵活指示层标识， 实现动态调整码字到层的映射。具体内容可以参考前述描述，在此就不再赘述。
在本申请实施例中，方法#400描述的是以信道特征值阈值与层标识为第一指示参数，但是该第一指示参数也可以是信号功率阈值和层标识、信号能量阈值和层标识、参考信号接收功率阈值和层标识、信噪比阈值和层标识、信干噪比阈值和层标识。比如可以把方案中的信道特征值阈值和层标识替换为信号功率阈值和层标识、信号能量阈值和层标识、参考信号接收功率阈值和层标识、信噪比阈值和层标识、信干噪比阈值和层标识，信道特征值和层标识替换为信号功率和层标识、信号能量和层标识、参考信号接收功率和层标识、信噪比和层标识、信干噪比和层标识。因此，对于上述所提及的第一指示参数相关的技术方案可以参考方法#400所示的内容，本申请实施例不再赘述。
前文提到，码字到层的映射也可以包括码字到层的映射表格中具体的某行或者某列，因此，第一指示参数与码字到层的映射具有对应关系可以理解为：第一指示参数与码字到层的映射表格(该映射表格为表9)中具体的某行或者某列具有对应关系。示例性地，在表9中，信道特征值阈值(dB)为10、层标识为0对应第三行，信道特征值阈值(dB)为10、层标识为8对应第四行等。关于第一指示参数与码字到层的映射表格中具体的某行或者某列具有对应关系的描述可以参考该所述内容，该所述内容仅作为示例性理解。
图5为本申请实施例中另一种通信方法的交互示意图。该方法#500包括：
S510，终端设备确定指示参数#V，该指示参数#V与码字到层的映射具有对应关系。
具体地，终端设备基于准则#Q从指示参数的候选值中选出指示参数#V(指示参数#V可以理解为终端设备建议的指示参数)，用以上报给网络设备。
示例性地，准则#Q可以是指终端设备的性能最优、信令开销最小等等。指示参数#V与码字到层的映射具有对应关系。例如，指示参数的候选值为{#Y，#Z，#V}，指示参数为#Y，对应码字到层的映射#A1，指示参数为#Z，对应码字到层的映射#B1，指示参数为#V，对应码字到层的映射#C1。具体可以参见前述内容，在此不再赘述。
S520，终端设备向网络设备上报指示参数#V。
相应地，网络设备接收指示参数#V。
一个可能的实现方式，终端设备在CSI测量反馈中上报指示参数#V。
具体地，网络设备向终端设备发送CSI-RS，终端设备通过信道估计获得信道。终端设备基于准则#Q从指示参数的候选值中选出指示参数#V用以上报给网络设备。终端设备确定指示参数#V之后，基于指示参数#V和指示参数与码字到层的映射的对应关系确定指示参数#V对应的码字到层的映射，终端设备再确定秩标识(rank indicator，RI)和预编码矩阵(precoding matrix indicator，PMI)，并继而确定信道质量标识(channel quality indicator，CQI)。
终端设备可以在每个码字上上报一个或多个CQI，这可以辅助网络设备调度或数据传输时的码字到层映射的决策，从而提升通信性能。终端设备可以在CSI反馈时向网络设备上报指示参数#V。同时，终端设备可以向网络设备上报RI、PMI和CQI等。
一个可能的实现方式，终端设备在物理上行控制信道(physical uplink control channel，PUCCH)或物理上行共享信道(physical uplink shared channel，PUSCH)中上报指示参数#V。
S530，网络设备确定第一指示参数，该第一指示参数与码字到层的映射具有对应关系。
具体地，网络设备从指示参数的候选值中选出第一指示参数。
可选地，网络设备可以基于终端设备上报的指示参数#V确定第一指示参数。第一指示参数可以与指示参数#V相同，也可以与指示参数#V不同。
S540，网络设备向终端设备发送第一指示参数。
相应地，终端设备接收第一指示参数。
具体地，网络设备可以通过高层信令或者物理层信令向终端设备发送第一指示参数。网络设备可以通过前述实施例中的实现方式来指示第一指示参数，在此不再赘述。
一个可能的实现方式，第一指示参数适用于1个终端设备，即1个终端设备可以用一个第一指示参数。
一个可能的实现方式，第一指示参数适用于多个终端设备，即多个终端设备可以共用一个第一指示参数。
一个可能的实现方式，第一指示参数适用于一个小区内所有终端设备。
上述的实现方式可以通过前述实施例中的实现方式来指示第一指示参数，在此不再赘述。
S550，终端设备确定第一指示参数与码字到层的映射之间的对应关系。
具体地，终端设备可以通过前述实施例中的三种方式确定该对应关系，在此不再赘述。
S560，终端设备根据第一指示参数与该对应关系确定码字到层的映射。
具体可以参考前述步骤S230的描述，在此不再赘述。
可选地，该方法#500还可以包括：
S570，终端设备向网络设备发送第一指示信息或者第二指示信息。
具体地，第一指示信息用于指示第一指示参数是否适用或者是否需要更新，第二指示信息包括终端设备建议的的指示参数#Z。
一个可能的示例，终端设备在接收第一指示参数之后根据DMRS的检测性能确定第一指示参数是否合适。终端设备可以采用与NACK机制联合编码的方式向(比如：NACK+适用；或者，NACK+不适用)网络设备发送用于指示第一指示参数是否适用或者是否需要更新的第一指示信息，也可以采用独立编码的方式向网络设备发送用于指示第一指示参数是否适用或者是否需要更新的第一指示信息。
又一个可能的示例，终端设备在接收第一指示参数之后采用与非确认机制联合编码(比如：NACK+#Z)的方式向网络设备发送包括建议的指示参数#Z的第二指示信息，也可以采用独立编码的方式向网络设备发送包括建议的指示参数#Z的第二指示信息。
通过终端设备向网络设备上报建议的指示参数#Z或者指示信息，本申请实施例可以使得网络设备可以基于终端设备发送的指示参数或者指示信息确定合适的第一指示参数，且终端设备向网络设备上报的指示参数或者指示信息能够影响网络设备在数据传输时的码字到层映射的决策，继而网络设备能够确定合适的第一指示参数，从而可以提升通信性能。
可选地，该方法#500还可以包括：
S580，网络设备向终端设备发送第三指示参数。
具体而言，终端设备向网络设备上报的第一指示信息或者第二指示信息能够影响网络 设备在数据传输时的码字到层映射的决策，具体地，网络设备基于终端设备发送的第一指示信息或者第二指示信息继而网络设备能够确定合适的指示参数(例如，第三指示参数)，从而可以提升通信性能。
在本申请实施例中，方法#500可以包括S510～S580，也可以包括S510～S570，也可以包括S530～S580，也可以包括S510～S560，也可以包括S530～S570等等，本申请实施例不做限定。
在本申请实施例中，图2、、图3、图4和图5所示的方法不仅可以应用于数据传输，还可以应用于CSI反馈。
具体地，网络设备向终端设备发送CSI-RS，终端设备通过信道估计获得信道。网络设备确定第一指示参数，第一指示参数与码字到层的映射具有对应关系。网络设备发送第一指示参数给终端设备。终端设备确定第一指示参数后，基于第一指示参数和第一指示参数与码字到层的映射的对应关系确定第一指示参数对应的码字到层的映射，终端设备再确定秩标识(rank indicator，RI)和预编码矩阵(precoding matrix indicator，PMI)，并继而确定信道质量标识(channel quality indicator，CQI)。
终端设备可以在每个码字上上报一个或多个CQI，这可以辅助网络设备调度或数据传输时的码字到层映射的决策，从而提升通信性能。终端设备可以在CSI反馈时向网络设备上报第二指示参数。终端设备可以向网络设备上报RI、PMI和CQI等。如此，本申请实施例就可以实现辅助网络设备在数据传输时的码字到层映射的决策，可提升通信性能。
以上描述了本申请实施例的方法实施例，下面对相应的装置实施例进行介绍。
为了实现上述本申请实施例提供的方法中的各功能，终端、网络设备均可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
图6为本申请实施例中通信装置600的示意图。该通信装置600包括处理器601和通信接口602，该处理器601和通信接口602通过总线603相互连接。图6所示的通信装置600可以是网络设备，也可以是终端设备。
可选地，该通信装置600还包括存储器604。
存储器604包括但不限于是随机存储记忆体(random access memory，RAM)、只读存储器(read-only memory，ROM)、可擦除可编程只读存储器(erasable programmable read only memory，EPROM)、或便携式只读存储器(compact disc read-only memory，CD-ROM)，该存储器604用于相关指令及数据。
处理器601可以是一个或多个中央处理器(central processing unit，CPU)，在处理器601是一个CPU的情况下，该CPU可以是单核CPU，也可以是多核CPU。
当该通信装置600是网络设备，该通信装置600中的处理器601用于读取该存储器604中存储的计算机程序或指令，示例性地，执行以下操作：
确定第一指示参数，该第一指示参数与码字到层的映射具有对应关系；发送第一指示参数。
又示例性地，可以执行以下操作：
确定第一指示参数与码字到层的映射之间的对应关系；发送该对应关系。
上述所述内容仅作为示例性描述。该通信装置600是网络设备时，其将负责执行前述方法实施例中与网络设备相关的方法或者步骤。
当该通信装置600是终端设备，该通信装置600中的处理器601用于读取该存储器604中存储的程序代码，示例性地，执行以下操作：
接收第一指示参数，第一指示参数与码字到层的映射具有对应关系；确定该对应关系；根据第一指示参数与该对应关系确定码字到层的映射。
上述所述内容仅作为示例性描述。该通信装置600是终端设备时，其将负责执行前述方法实施例中与终端设备相关的方法或者步骤。
上述描述仅是示例性描述。具体内容可以参见上述方法实施例所示的内容。另外，图7中的各个操作的实现还可以对应参照图2至图5所示的方法实施例的相应描述。
图7为本申请实施例中又一通信装置700的示意图，该通信装置700可以应用于网络设备，可以用于实现上述实施例涉及的方法。该通信装置700包括收发单元710和处理单元720。下面对该收发单元710和处理单元720进行示例性地介绍。
当该通信装置700是网络设备，示例性地，该收发单元710用于发送第一指示参数。该处理单元720用于确定第一指示参数、确定第一指示参数与码字到层的映射之间的对应关系。该收发单元710还可以用于接收终端设备发送的指示信息或者第二指示参数。
上述所述内容仅作为示例性描述。该通信装置700是网络设备时，其将负责执行前述方法实施例中与网络设备相关的方法或者步骤。
作为一个可能的实现方式，该通信装置700还包括存储单元730，该存储单元730用于存储用于执行前述方法的程序或者代码。
另外，图7的各个操作的实现还可以对应参照上述实施例所示的方法相应描述，在此不再赘述。
图7所示的通信装置700还可以应用于终端设备，可以用于实现上述实施例涉及的方法。当该通信装置700是终端设备，示例性地，该收发单元710用于接收第一指示参数。该处理单元720用于确定第一指示参数与码字到层的映射之间的对应关系，还用于根据第一指示参数与该对应关系确定码字到层的映射。
上述所述内容仅作为示例性描述。该通信装置700是终端设备时，其将负责执行前述方法实施例中与终端设备相关的方法或者步骤。
图6和图7所示的装置实施例是用于实现前述方法实施例图2至图5所述的内容的。因此，图6和图7所示装置的具体执行步骤与方法可以参见前述方法实施例所述的内容。
图8为本申请实施例中另一通信装置800的示意图。该通信装置800可用于实现上述方法中第一通信装置、第二通信装置的功能，该通信装置800可以是通信装置或者通信装置中的芯片。
该通信装置800包括：输入输出接口820和处理器810。输入输出接口820可以是输入输出电路。处理器810可以是信号处理器、芯片，或其他可以实现本申请方法的集成电 路。其中，输入输出接口820用于信号或数据的输入或输出。
举例来说，当该通信装置800为第一通信装置时，输入输出接口820用于接收第一指示参数。举例来说，当该通信装置800为第二通信装置时，输入输出接口820用于发送第一指示参数。其中，处理器810用于执行本申请实施例提供的任意一种方法的部分或全部步骤。
举例来说，当该通信装置800为第一通信装置时，用于执行上述方法实施例中各种可能的实现方式中第一通信装置执行的步骤。例如，处理器810用于确定第一指示参数对应的码字到层的映射。当该通信装置800为第二通信装置时，用于执行上述方法实施例中各种可能的实现方法中第二通信装置执行的步骤。例如，处理器810用于确定第一指示参数。
一种可能的实现中，处理器810通过执行存储器中存储的指令，以实现第一通信装置、第二通信装置或终端实现的功能。
可选的，该通信装置800还包括存储器。
可选的，处理器和存储器集成在一起。
可选的，存储器在通信装置800之外。
一种可能的实现中，处理器810可以为逻辑电路，处理器810通过输入输出接口820输入/输出消息或信令。其中，逻辑电路可以是信号处理器、芯片，或其他可以实现本申请实施例方法的集成电路。
上述对于图8的装置的描述仅是作为示例性描述，该装置能够用于执行前述实施例所述的方法，具体内容可以参见前述方法实施例的描述，在此不再赘述。
本申请实施例还提供了一种芯片，包括处理器，用于从存储器中调用并运行所述存储器中存储的指令，使得安装有所述芯片的通信设备执行上述各示例中的方法。
本申请实施例还提供另一种芯片，包括：输入接口、输出接口、处理器，所述输入接口、输出接口以及所述处理器之间通过内部连接通路相连，所述处理器用于执行存储器中的代码，当所述代码被执行时，所述处理器用于执行上述各示例中的方法。可选地，该芯片还包括存储器，该存储器用于存储计算机程序或者代码。
本申请实施例还提供了一种处理器，用于与存储器耦合，用于执行上述各实施例中任一实施例中涉及第一通信装置或者第二通信装置的方法和功能。
在本申请的另一实施例中提供一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，前述实施例的方法得以实现。
本申请实施例还提供一种计算机程序，当该计算机程序在计算机中被运行时，前述实施例的方法得以实现。
在本申请的另一实施例中提供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，该计算机程序被计算机执行时实现前述实施例所述的方法。
在本申请实施例的描述中，除非另有说明，“多个”是指二个或多于二个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。
另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第 一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。同时，在本申请实施例中，“示例性地”或者“例如”等词用于表示作例子、例证或说明。
本申请实施例中被描述为“示例性地”或者“例如”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"示例性的"或者"例如"等词旨在以具体方式呈现相关概念，便于理解。
在本申请实施例的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A，B可以是单数或者复数。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。
因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
可以理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。
因此，在整个说明书各个实施例未必指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
可以理解，在本申请的各种实施例中，各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，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，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，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。
所属领域的技术人员可以清楚地了解到，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。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，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，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。
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，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。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，在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，也可以二个或二个以上单元集成在一个单元中。
功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上，仅为本申请实施例的具体实施方式，但本申请实施例的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请实施例揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请实施例的保护范围之内。因此，本申请实施例的保护范围应以权利要求的保护范围为准。

Claims (34)

  1. 一种通信方法，其特征在于，包括：
    第一通信装置接收第一指示参数，所述第一指示参数与第一码字到层的映射具有对应关系；
    所述第一通信装置根据所述第一指示参数确定所述第一码字到层的映射。
  2. 根据权利要求1所述的方法，其特征在于，所述第一指示参数包括以下至少一项：
    信道特征，通信装置能力，或者，调度信息。
  3. 根据权利要求2所述的方法，其特征在于，所述信道特征包括以下至少一项：
    信道特征值阈值，信噪比阈值，天线端口数量，场景，位置，信道径特征，或者，信道时延特征；
    或者，所述通信装置能力包括以下至少一项：
    最大支持的码字数目，最大支持的层数目，或者，是否支持码字到层的动态映射；
    或者，所述调度信息包括以下至少一项：
    调制方式，码率，传输块大小，或者，层标识。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一通信装置发送第二指示参数，所述第二指示参数与第二码字到层的映射具有对应关系。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述第一通信装置根据所述第一指示参数确定所述第一码字到层的映射，包括：
    所述第一通信装置根据所述第一指示参数确定所述第一指示参数与所述第一码字到层的映射之间的对应关系；
    所述第一通信装置根据所述第一指示参数以及所述第一指示参数与所述第一码字到层的映射之间的对应关系确定所述第一码字到层的映射；或者，
    所述第一通信装置接收所述第一指示参数与所述第一码字到层的映射之间的对应关系；
    所述第一通信装置根据所述第一指示参数以及所述第一指示参数与所述第一码字到层的映射之间的对应关系确定所述第一码字到层的映射；或者，
    所述第一通信装置根据所述第一指示参数以及所述第一指示参数与所述第一码字到层的映射之间的对应关系确定所述第一码字到层的映射，其中，所述第一指示参数与所述第一码字到层的映射之间的对应关系是预定义的。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述第一通信装置接收第一指示参数之后，所述方法还包括：
    所述第一通信装置发送第一指示信息，所述第一指示信息用于指示所述第一指示参数是否适用或者所述第一指示参数是否需要更新。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，
    所述第一指示参数的指示信息和所述第一指示参数与所述第一码字到层的映射之间的对应关系的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息； 或者，
    所述第一指示参数的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息；或者，
    所述第一指示参数与所述第一码字到层的映射之间的对应关系的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，所述第一通信装置接收所述第一指示参数，包括：
    所述第一通信装置接收第二通信装置发送的所述第一指示参数。
  9. 一种通信方法，其特征在于，包括：
    第二通信装置确定第一指示参数，所述第一指示参数与第一码字到层的映射具有对应关系；
    所述第二通信装置向第一通信装置发送所述第一指示参数。
  10. 根据权利要求9所述的方法，其特征在于，所述第一指示参数包括以下至少一项：
    信道特征，通信装置能力，或者，调度信息。
  11. 根据权利要求10所述的方法，其特征在于，所述信道特征包括以下至少一项：
    信道特征值阈值，信噪比阈值，天线端口数量，场景，位置，信道径特征，或者，信道时延特征；
    或者，所述通信装置能力包括以下至少一项：
    最大支持的码字数目，最大支持的层数目，或者，是否支持码字到层的动态映射；
    或者，所述调度信息包括以下至少一项：
    调制方式，码率，传输块大小，或者，层标识。
  12. 根据权利要求9至11中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二通信装置向所述第一通信装置发送所述第一指示参数与所述第一码字到层的映射之间的对应关系。
  13. 根据权利要求9至12中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二通信装置接收所述第一通信装置发送的第二指示参数，所述第二指示参数与第二码字到层的映射具有对应关系。
  14. 根据权利要求9至13中任一项所述的方法，其特征在于，所述第二通信装置向第一通信装置发送所述第一指示参数之后，所述方法还包括：
    所述第二通信装置接收所述第一通信装置发送的第一指示信息，所述第一指示信息用于指示所述第一指示参数是否适用或者所述第一指示参数是否需要更新。
  15. 根据权利要求9至14中任一项所述的方法，其特征在于，
    所述第一指示参数的指示信息和所述第一指示参数与所述第一码字到层的映射之间的对应关系的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息；或者，
    所述第一指示参数的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息；或者，
    所述第一指示参数与所述第一码字到层的映射之间的对应关系的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息。
  16. 一种通信装置，其特征在于，包括：
    收发单元，用于接收第一指示参数，所述第一指示参数与第一码字到层的映射具有对应关系；
    处理单元，用于根据所述第一指示参数确定所述第一码字到层的映射。
  17. 根据权利要求16所述的装置，其特征在于，所述第一指示参数包括以下至少一项：
    信道特征，通信装置能力，或者，调度信息。
  18. 根据权利要求17所述的装置，其特征在于，所述信道特征包括以下至少一项：
    信道特征值阈值，信噪比阈值，天线端口数量，场景，位置，信道径特征，或者，信道时延特征；
    或者，所述通信装置能力包括以下至少一项：
    最大支持的码字数目，最大支持的层数目，或者，是否支持码字到层的动态映射；
    或者，所述调度信息包括以下至少一项：
    调制方式，码率，传输块大小，或者，层标识。
  19. 根据权利要求16至18中任一项所述的装置，其特征在于，所述收发单元，还用于发送第二指示参数，所述第二指示参数与第二码字到层的映射具有对应关系。
  20. 根据权利要求16至19中任一项所述的装置，其特征在于，
    所述处理单元，用于根据所述第一指示参数确定所述第一指示参数与所述第一码字到层的映射之间的对应关系；
    所述处理单元，还用于根据所述第一指示参数以及所述第一指示参数与所述第一码字到层的映射之间的对应关系确定所述第一码字到层的映射；或者，
    所述收发单元，还用于接收所述第一指示参数与所述第一码字到层的映射之间的对应关系；
    所述处理单元，还用于根据所述第一指示参数以及所述第一指示参数与所述第一码字到层的映射之间的对应关系确定所述第一码字到层的映射；或者，
    所述处理单元，还用于根据所述第一指示参数以及所述第一指示参数与所述第一码字到层的映射之间的对应关系确定所述第一码字到层的映射，
    其中，所述第一指示参数与所述第一码字到层的映射之间的对应关系是预定义的。
  21. 根据权利要求16至20中任一项所述的装置，其特征在于，
    所述收发单元，还用于发送第一指示信息，所述第一指示信息用于指示所述第一指示参数是否适用或者所述第一指示参数是否需要更新。
  22. 根据权利要求16至21中任一项所述的装置，其特征在于，
    所述第一指示参数的指示信息和所述第一指示参数与所述第一码字到层的映射之间的对应关系的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息；或者，
    所述第一指示参数的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息；或者，
    所述第一指示参数与所述第一码字到层的映射之间的对应关系的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息。
  23. 根据权利要求16至22中任一项所述的装置，其特征在于，所述收发单元，还用于接收第二通信装置发送的所述第一指示参数。
  24. 一种通信装置，其特征在于，包括：
    处理单元，用于确定第一指示参数，所述第一指示参数与第一码字到层的映射具有对应关系；
    收发单元，用于向第一通信装置发送所述第一指示参数。
  25. 根据权利要求24所述的装置，其特征在于，所述第一指示参数包括以下至少一项：
    信道特征，通信装置能力，或者，调度信息。
  26. 根据权利要求25所述的装置，其特征在于，所述信道特征包括以下至少一项：
    信道特征值阈值，信噪比阈值，天线端口数量，场景，位置，信道径特征，或者，信道时延特征；
    或者，所述通信装置能力包括以下至少一项：
    最大支持的码字数目，最大支持的层数目，或者，是否支持码字到层的动态映射；
    或者，所述调度信息包括以下至少一项：
    调制方式，码率，传输块大小，或者，层标识。
  27. 根据权利要求24至26中任一项所述的装置，其特征在于，所述收发单元，还用于向所述第一通信装置发送所述第一指示参数与所述第一码字到层的映射之间的对应关系。
  28. 根据权利要求24至27中任一项所述的装置，其特征在于，所述收发单元，还用于接收所述第一通信装置发送的第二指示参数，所述第二指示参数与第二码字到层的映射具有对应关系。
  29. 根据权利要求24至28中任一项所述的装置，其特征在于，
    所述收发单元，还用于接收所述第一通信装置发送的第一指示信息，所述第一指示信息用于指示所述第一指示参数是否适用或者所述第一指示参数是否需要更新。
  30. 根据权利要求24至29中任一项所述的装置，其特征在于，
    所述第一指示参数的指示信息和所述第一指示参数与所述第一码字到层的映射之间的对应关系的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息；或者，
    所述第一指示参数的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息；或者，
    所述第一指示参数与所述第一码字到层的映射之间的对应关系的指示信息为用户级指示信息、用户组级指示信息，或者，小区级指示信息。
  31. 一种通信装置，其特征在于，包括处理器，所述处理器与存储器耦合，所述处理器用于执行计算机程序或指令，使得所述通信装置执行如权利要求1-15中任一项所述的方法。
  32. 一种通信装置，其特征在于，包括逻辑电路和输入输出接口，所述逻辑电路用于执行计算机程序或指令，使得所述通信装置执行如权利要求1-15中任一项所述的方法。
  33. 一种计算机可读存储介质，其特征在于，包括计算机程序或指令，当所述计算机 程序或所述指令在计算机上运行时，使得所述计算机执行如权利要求1-15中任意一项所述的方法。
  34. 一种计算机程序产品，其特征在于，包含指令，当所述指令在计算机上运行时，使得所述计算机执行如权利要求1-15中任意一项所述的方法。
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