WO2023207650A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2023207650A1
WO2023207650A1 PCT/CN2023/088620 CN2023088620W WO2023207650A1 WO 2023207650 A1 WO2023207650 A1 WO 2023207650A1 CN 2023088620 W CN2023088620 W CN 2023088620W WO 2023207650 A1 WO2023207650 A1 WO 2023207650A1
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WIPO (PCT)
Prior art keywords
port index
port
index group
indication information
group
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PCT/CN2023/088620
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English (en)
French (fr)
Inventor
高翔
董昶钊
刘鹍鹏
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华为技术有限公司
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Publication of WO2023207650A1 publication Critical patent/WO2023207650A1/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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present application relates to the field of communication technology, and in particular, to a communication method and device.
  • DMRS Demodulation reference signal
  • the data channel can be, for example, a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH)
  • the control channel can be, for example, a physical downlink control channel (physical downlink control channel, PDCCH).
  • the access network device when the access network device sends data to the terminal device through PDSCH, the data can be precoded according to the downlink channel state information (CSI); further, the access network device can also The terminal device allocates a DMRS port and sends DMRS to the terminal device through PDSCH on the time-frequency resource corresponding to the DMRS port.
  • DMRS usually undergoes the same signal processing as the data, such as precoding. In this way, after receiving the DMRS corresponding to the DMRS port, the terminal device can use the channel estimation algorithm to obtain an estimate of the equivalent channel, and then can complete data demodulation based on the equivalent channel.
  • the present application provides a communication method and device, which are used to indicate to the terminal device the port allocated to the terminal device after port expansion.
  • the access network device may send first indication information to the terminal device, and send second indication information to the terminal device; when the second indication information indicates a first value, the first indication information indicates a third value.
  • the second port index group; the first port index group and the second port index group have an associated relationship.
  • the DMRS port index group indicated by the first indication information has different values for different values indicated by the second indication information.
  • the indication overhead it is possible to effectively reduce the indication overhead while indicating the port allocated to the terminal device.
  • the association relationship is: a port index in the first port index group and a port index in the second port index group have a one-to-one correspondence.
  • the port indexes in the multiple port index groups included in the first set are all existing DMRS port indexes
  • the port indexes in the multiple port index groups included in the second set are all new DMRS port indexes.
  • the first port index group indicated by the first indication information includes the existing DMRS port index.
  • the first port index group indicated by the first indication information includes The two-port index group includes a new DMRS port index, so that the access network equipment can not allocate existing DMRS ports and new DMRS ports to the terminal equipment at the same time, so as to better ensure the performance of channel estimation.
  • the first set corresponds to multiple port indexes
  • each port index group includes all At least one port index among the plurality of port indexes; the offset is equal to the number of port indexes corresponding to the first set.
  • the number of port indexes corresponding to the first set may be different from the number of port index groups included in the first set.
  • the port indexes corresponding to the first set include DMRS port indexes "0 ⁇ 3" (that is, the number of port indexes corresponding to the first set is 4).
  • the first set may include 12 port index groups.
  • Table 3A For details, please refer to Table 3A.
  • the value of the offset is 4, 8, 6 or 12.
  • the association relationship is: the first port index group is a subset of the second port index group.
  • the second port index group includes the port index in the first port index group, and also includes a port index corresponding to the port index in the first port index group; the first port index group The port index group includes a first port index, and there is an offset between a port index corresponding to the first port index and the first port index.
  • the second indication information is carried in a radio resource control RRC message or downlink control information DCI.
  • the first indication information indicates a first index value; the first index value is associated with the first port index group and the second port index group.
  • the time-frequency resources corresponding to the first port index group and the second port index group are the same; the first port index group corresponds to the first mask sequence, and the second port index group corresponds to the first mask sequence.
  • the group corresponds to the second mask sequence, and the first mask sequence and the second mask sequence are orthogonal.
  • the method further includes: sending third indication information to the terminal device; when the first indication information indicates the first port index group, the third indication information indicates On the time-frequency resources allocated to the terminal equipment, whether the second port index group is allocated to other terminal equipment; or, when the first indication information indicates the second port index group, the third The indication information indicates whether to allocate the first port index group to other terminal devices on the time-frequency resources allocated to the terminal device.
  • the terminal device can perform channel estimation in a corresponding manner according to the third indication information. For example, when the third indication information indicates that the second port index group (or the first port index group) is not allocated to other terminal devices on the time-frequency resources allocated to the terminal device, the terminal device may, according to the third indication information, The despreading of the outer mask is not considered during channel estimation, thereby making the implementation of channel estimation simpler; for another example, when the third indication information indicates that the second port index group is allocated to the time-frequency resource for the terminal device, (or the first port index group) is allocated to other terminal equipment, the terminal equipment can consider the despreading of the inner layer mask and the outer layer mask when estimating the channel according to the third indication information, thereby facilitating the reduction of existing Interference between DMRS port and newly added DMRS port.
  • embodiments of the present application provide a communication method, which can be applied to a terminal device or a module (such as a chip) in the terminal device.
  • the terminal device can Receive first indication information from an access network device, and receive second indication information from the access network device; when the second indication information indicates a first value, the first indication information indicates a first set The first port index group among the plurality of port index groups included; when the second indication information indicates a second value, the first indication information indicates the first port index group among the plurality of port index groups included in the second set.
  • Two-port index group; the first port index group and the second port index group have an associated relationship.
  • the association relationship is: a port index in the first port index group and a port index in the second port index group have a one-to-one correspondence.
  • the first set corresponds to multiple port indexes
  • each port index group includes all At least one port index among the plurality of port indexes; the offset is equal to the number of port indexes corresponding to the first set.
  • the value of the offset is 4, 8, 6 or 12.
  • the association relationship is: the first port index group is a subset of the second port index group.
  • the second port index group includes the port index in the first port index group, and also includes the port index corresponding to the port index in the first port index group;
  • the first port index group includes a first port index, and there is an offset between a port index corresponding to the first port index and the first port index.
  • the second indication information is carried in an RRC message or DCI.
  • the first indication information indicates a first index value; the first index value is associated with the first port index group and the second port index group.
  • the time-frequency resources corresponding to the first port index group and the second port index group are the same; the first port index group corresponds to the first mask sequence, and the second port index group corresponds to the first mask sequence.
  • the group corresponds to the second mask sequence, and the first mask sequence and the second mask sequence are orthogonal.
  • the method further includes: receiving third indication information from the access network device; when the first indication information indicates the first port index group, the third indication The information indicates whether to allocate the second port index group to other terminal equipment on the time-frequency resources allocated to the terminal equipment; or, when the first indication information indicates the second port index group, the The third indication information indicates whether to allocate the first port index group to other terminal devices on the time-frequency resources allocated to the terminal device.
  • the present application provides a communication device.
  • the communication device has the function of implementing the first aspect.
  • the communication device includes modules or units or means (means) corresponding to performing operations related to the first aspect.
  • the module or unit or means can be implemented by software, or implemented by hardware, or can also be implemented by hardware executing corresponding software.
  • the communication device includes a processing unit and a communication unit, where the communication unit can It is used to send and receive signals to realize communication between the communication device and other devices; the processing unit can be used to perform some internal operations of the communication device.
  • the functions performed by the processing unit and the communication unit may correspond to the operations related to the above-mentioned first aspect.
  • the communication device includes a processor, and the processor can be coupled to a memory.
  • the memory may store necessary computer programs or instructions to implement the functions involved in the first aspect.
  • the processor can execute the computer program or instructions stored in the memory. When the computer program or instructions are executed, the communication device implements the method in any possible design or implementation manner in the above-mentioned first aspect.
  • the communication device includes a processor and a memory, and the memory can store the necessary computer programs or instructions to implement the functions involved in the first aspect.
  • the processor can execute the computer program or instructions stored in the memory.
  • the communication device implements the method in any possible design or implementation manner in the above-mentioned first aspect.
  • the communication device includes a processor and an interface circuit, wherein the processor is configured to communicate with other devices through the interface circuit and perform any of the possible designs or implementations in the first aspect. method.
  • the present application provides a communication device.
  • the communication device is capable of implementing the functions related to the second aspect.
  • the communication device includes modules or units or means corresponding to performing operations related to the second aspect, so The above-mentioned functions, units or means can be realized by software, or by hardware, or by hardware executing corresponding software.
  • the communication device includes a processing unit and a communication unit, where the communication unit can be used to send and receive signals to implement communication between the communication device and other devices.
  • the communication unit is used to send messages to a terminal.
  • the device sends system information; the processing unit may be used to perform some internal operations of the communication device.
  • the functions performed by the processing unit and the communication unit may correspond to the operations related to the above-mentioned second aspect.
  • the communication device includes a processor, and the processor can be coupled to a memory.
  • the memory may store necessary computer programs or instructions to implement the functions related to the second aspect above.
  • the processor can execute the computer program or instructions stored in the memory. When the computer program or instructions are executed, the communication device implements the method in any possible design or implementation of the second aspect.
  • the communication device includes a processor and a memory, and the memory can store the necessary computer programs or instructions to implement the functions involved in the second aspect.
  • the processor can execute the computer program or instructions stored in the memory. When the computer program or instructions are executed, the communication device implements the method in any possible design or implementation of the second aspect.
  • the communication device includes a processor and an interface circuit, wherein the processor is configured to communicate with other devices through the interface circuit and execute the method in any possible design or implementation of the second aspect.
  • the processor can be implemented by hardware or software.
  • the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software,
  • the processor may be a general-purpose processor implemented by reading software code stored in memory.
  • the above processors may be one or more, and the memories may be one or more.
  • the memory can be integrated with the processor, or the memory can be provided separately from the processor. During the specific implementation process, the memory and the processor can be integrated on the same chip, or they can be respectively provided on different chips. The embodiments of this application do not limit the type of memory and the arrangement method of the memory and the processor.
  • the present application provides a communication system, which may include the communication system provided in the third aspect. communication device and the communication device provided in the fourth aspect.
  • the present application provides a computer-readable storage medium.
  • Computer-readable instructions are stored in the computer storage medium.
  • the computer reads and executes the computer-readable instructions, the computer is caused to execute the above-mentioned first aspect or Methods in any possible design of the second aspect.
  • the present application provides a computer program product, which when a computer reads and executes the computer program product, causes the computer to execute the method in any possible design of the first aspect or the second aspect.
  • the present application provides a chip.
  • the chip includes a processor.
  • the processor is coupled to a memory and is used to read and execute a software program stored in the memory to implement the first aspect or the second aspect. any possible design approach.
  • Figure 1 is a schematic diagram of a network architecture applicable to the embodiment of the present application.
  • Figure 2 is a schematic diagram of DMRS resource mapping provided by an embodiment of the present application.
  • Figure 3 is a schematic flow chart corresponding to the DMRS port indication method provided by the embodiment of the present application.
  • Figure 4 is a schematic diagram of an expanded DMRS port provided by an embodiment of the present application.
  • Figure 5 is another schematic diagram of expanding a DMRS port provided by an embodiment of the present application.
  • Figure 6 is a schematic flow chart corresponding to the communication method provided by the embodiment of the present application.
  • Figure 7 is a possible exemplary block diagram of the device involved in the embodiment of the present application.
  • Figure 8 is a schematic structural diagram of an access network device provided by an embodiment of the present application.
  • Figure 9 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • FIG 1 is a schematic architectural diagram of a communication system applied in an embodiment of the present application.
  • the communication system 1000 includes a wireless access network 100 and a core network 200.
  • the communication system 1000 may also include the Internet 300.
  • the radio access network 100 may include at least one radio access network device, such as 110a and 110b in Figure 1, and may also include at least one terminal device, such as 120a-120j in Figure 1.
  • 110a is a base station
  • 110b is a micro station
  • 120a, 120e, 120f and 120j are mobile phones
  • 120b is a car
  • 120c is a gas pump
  • 120d is a home access point (HAP) arranged indoors or outdoors.
  • 120g is a laptop
  • 120h is a printer
  • 120i is a drone.
  • terminal equipment can be connected to wireless access network equipment, and wireless access network equipment can be connected to core network equipment in the core network.
  • the core network equipment and the radio access network equipment can be independent and different physical devices, or the functions of the core network equipment and the logical functions of the radio access network equipment can be integrated on the same physical device, or they can be one physical device. It integrates the functions of some core network equipment and some functions of wireless access network equipment.
  • Terminal devices and terminal devices and wireless access network devices and wireless access network devices may be connected to each other in a wired or wireless manner.
  • Figure 1 is only a schematic diagram.
  • the communication system may also include other equipment, such as wireless relay equipment and wireless backhaul equipment, which are not shown in Figure 1 .
  • the wireless access network equipment and terminal equipment are introduced below.
  • Wireless access network equipment can also be called access network equipment, and access network equipment can be base stations, evolved base stations (evolved NodeB, eNodeB), transmission reception point (TRP), next generation base station (next generation NodeB, gNB) in the fifth generation (5th generation, 5G) mobile communication system, sixth generation (6th generation, 6G)
  • the unit (central unit, CU) can also be a distributed unit (distributed unit, DU).
  • the access network equipment may be a macro base station (110a in Figure 1), a micro base station or an indoor station (110b in Figure 1), or a relay node or a donor node.
  • the embodiments of this application do not limit the specific technology and specific equipment form used by the access network equipment.
  • the device used to implement the function of the access device may be an access network device; it may also be a device that can support the access network device to implement the function, such as a chip system.
  • the device may be installed on the access network device. network equipment.
  • the chip system can be composed of chips, or can also include chips and other discrete devices.
  • Terminal equipment can also be called terminal, user equipment (UE), mobile station, mobile terminal, etc.
  • Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), and the Internet of Things (internet of things, IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc.
  • Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiments of this application do not limit the specific technology and specific equipment form used by the terminal equipment.
  • the device for realizing the function of the terminal device may be a terminal device; it may also be a device that can support the terminal device to realize the function, such as a chip system, and the device may be installed in the terminal device.
  • the technical solution provided by the embodiments of the present application is described by taking the device for realizing the functions of the terminal device being a terminal device as an example.
  • the mobile phones in Figure 1 include 120a, 120e, 120f and 120j.
  • the mobile phone 120a can access the base station 110a, connect to the car 120b, directly communicate with the mobile phone 120e and access the HAP;
  • the mobile phone 120e can access the HAP and directly communicate with the mobile phone 120a;
  • the mobile phone 120f can access the micro station 110b.
  • the mobile phone 120j can control the drone 120i.
  • the helicopter or drone 120i in Figure 1 can be configured as a mobile base station.
  • the terminal device 120i is a base station; but for the base station 110a , 120i is a terminal device, that is, communication between 110a and 120i is through a wireless air interface protocol.
  • communication between 110a and 120i can also be carried out through an interface protocol between base stations.
  • relative to 110a, 120i is also a base station. Therefore, both the wireless access network and the terminal equipment can be collectively called communication devices.
  • 110a and 110b in Figure 1 can be called communication devices with base station functions
  • 120a-120j in Figure 1 can be called communication devices with terminal equipment functions. device.
  • Access network equipment and terminal equipment can be fixed-position or removable. Access network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed On planes, balloons and satellites in the sky. The embodiments of this application do not limit the application scenarios of access network equipment and terminal equipment.
  • Communication between access network equipment and terminal equipment, between access network equipment and access network equipment, and between terminal equipment and terminal equipment can be carried out through licensed spectrum, or through unlicensed spectrum, or at the same time through authorized spectrum.
  • Spectrum and unlicensed spectrum for communication you can communicate through spectrum below 6 gigahertz (GHz), you can communicate through spectrum above 6 GHz, and you can communicate using spectrum below 6 GHz and spectrum above 6 GHz simultaneously.
  • the embodiments of the present application do not limit the spectrum resources used for wireless communication.
  • the communication system shown in Figure 1 above can support various radio access technologies (RAT).
  • the communication system shown in Figure 1 can be a fourth generation (4th generation, 4G) communication system (also known as Long term evolution (long term evolution, LTE) communication system), 5G communication system (also called new radio (NR) communication system), or future-oriented evolution system.
  • 4G fourth generation
  • LTE Long term evolution
  • NR new radio
  • the communication system and business scenarios described in the embodiments of this application are for the purpose of explaining the technical solutions of the embodiments of this application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of this application.
  • Those of ordinary skill in the art will know that with the communication With the evolution of the system and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.
  • the access network device can send control information to the terminal device through a control channel (such as PDCCH), thereby allocating transmission parameters of the data channel to the terminal device.
  • the data channel can be, for example, PDSCH or PUSCH.
  • the control information can indicate the time domain symbols and/or frequency domain resource blocks (RBs) mapped to the data channel, and then the access network equipment and the terminal equipment can use the data on the allocated time and frequency resources.
  • the channel transmits downlink data (such as data carried by PDSCH) and/or uplink data (such as data carried by PUSCH).
  • the time domain symbols in the embodiments of this application may be orthogonal frequency division multiplexing (OFDM) symbols, or they may be discrete fourier transform-spread-OFDM (discrete fourier transform-spread-OFDM, DFT-s-OFDM) symbols.
  • OFDM orthogonal frequency division multiplexing
  • DFT-s-OFDM discrete fourier transform-spread-OFDM
  • control channel such as PDCCH
  • data channel such as PDSCH or PUSCH
  • DMRS demodulation reference signal
  • the control channel such as PDCCH
  • data channel such as PDSCH or PUSCH
  • DMRS can be used to estimate the equivalent channel of the data signal carried by the data channel, thereby being used for detection and demodulation of data in the data channel.
  • DMRS usually undergoes the same signal processing as data, such as precoding, etc., thereby ensuring that DMRS and data experience the same equivalent channel.
  • the DMRS vector sent by the transmitter is s
  • the data signal (or data symbol) vector sent is Transmits simultaneously with DMRS and experiences the same channel.
  • the corresponding received signal vector at the receiving end can be expressed as:
  • y represents the data signal vector received by the receiving end
  • r represents the DMRS vector received by the receiving end
  • H represents the channel actually experienced by the data signal and DMRS
  • P represents the precoding matrix
  • n represents the noise signal vector.
  • the receiving end can use the channel estimation algorithm to obtain an estimate of the equivalent channel based on the known DMRS vector s, where the DMRS vector is composed of DMRS symbols corresponding to multiple DMRS ports; furthermore, the receiving end can obtain an estimate of the equivalent channel based on the equivalent channel.
  • the channel estimation algorithm can be, for example, a least square (LS) channel estimation algorithm, a minimum mean square error (MMSE) channel estimation algorithm, or a method based on discrete Fourier transform (DFT). )/Inverse Discrete Fourier Transform (inverse DFT, IDFT) delay domain channel estimation algorithm.
  • LS least square
  • MMSE minimum mean square error
  • DFT discrete Fourier transform
  • IDFT Inverse Discrete Fourier Transform
  • a port may refer to an antenna port, and a port may be understood as a transmitting antenna recognized by the receiving end, or a transmitting antenna that is spatially distinguishable.
  • One port can be configured for each virtual antenna, and each virtual antenna can be a weighted combination of multiple physical antennas.
  • the port used to send the reference signal may be called a reference signal port.
  • the reference signal may be DMRS, channel state information reference signal (CSI-RS) or sounding reference signal (SRS), specifically. No restrictions.
  • DMRS ports can be distinguished by different indexes (or port numbers).
  • the index of the DMRS port may be 1000+X, and the value of X may be an integer greater than or equal to 0. 1000+X can also be recorded as X.
  • the DMRS port can be called DMRS port 1000+X, or it can also be called DMRS port X. That is to say, in the embodiment of the present application, 1000+X and X can be understood as the index of the same DMRS port.
  • DMRS port a DMRS port
  • the method provided by the embodiment of the present application can also be applied to other possible reference signal ports, such as CSI-RS ports, SRS port.
  • the DMRS port may correspond to one or more DMRS signal symbols (also called DMRS modulation symbols, or simply DMRS symbols).
  • DMRS signal symbols also called DMRS modulation symbols, or simply DMRS symbols.
  • multiple DMRS symbols corresponding to the DMRS port can be sent in multiple time-frequency resources.
  • different DMRS ports are usually orthogonal ports to avoid interference between different DMRS ports.
  • Multiple DMRS symbols corresponding to one DMRS port can correspond to one DMRS sequence, and one DMRS sequence includes multiple DMRS sequence elements.
  • the DMRS sequence corresponding to a DMRS port can be mapped to the corresponding time-frequency resource after being multiplied by the corresponding mask sequence according to the time-frequency resource mapping rules. For example, for DMRS port p, the m-th DMRS sequence element r(m) in the corresponding DMRS sequence can be mapped to the resource element (resource element) with index (k, l) p, ⁇ according to the time-frequency resource mapping rules. , RE) on.
  • the RE with index (k, l) p, ⁇ can correspond to the time domain symbol with index l in a time slot in the time domain, and correspond to the subcarrier with index k in the frequency domain.
  • p is the index of the DMRS port
  • ⁇ is the subcarrier spacing parameter
  • w t (l′) is the time domain mask sequence element corresponding to the time domain symbol with index l′
  • w f (k′) is the frequency corresponding to the subcarrier with index k′ Domain mask sequence element
  • m 2n+k′
  • ⁇ is the subcarrier offset factor
  • w f (k′), w t (l′) and ⁇ corresponding to DMRS port p are related to the configuration type of DMRS. For details, please refer to the description of the configuration type of DMRS.
  • the configuration types of DMRS may include configuration type 1 (type 1) and configuration type 2 (type 2). Different configuration types support different numbers of orthogonal DMRS ports and different time-frequency resource mapping rules. Configuration type 1 and configuration type 2 are introduced below respectively.
  • w f (k′), w t (l′) and ⁇ corresponding to DMRS port p can be determined according to Table 1 below.
  • Table 1 Parameter values corresponding to different DMRS ports (type 1)
  • ⁇ is the index of the code division multiplexing (CDM) group (also called an orthogonal multiplexing group) to which the DMRS port p belongs.
  • CDM code division multiplexing
  • DMRS ports in the same CDM group occupy the same time-frequency resources.
  • "time-frequency resources occupied by the DMRS port” can also be replaced by "time-frequency resources corresponding to the DMRS port” or "time-frequency resources mapped by the DMRS port”.
  • the time-frequency resources mapped by DMRS sequences corresponding to different DMRS ports can be determined, as shown in (a) of Figure 2.
  • the time domain symbol length occupied by the DMRS port (or the number of time domain symbols occupied by the DMRS port) can be 1 or 2.
  • the time domain symbol length occupied by the DMRS port is 1, it can be called single-symbol DMRS.
  • DMRS When the time domain symbol length occupied by the port is 2, it can be called dual-symbol DMRS.
  • the following is an introduction to single-symbol DMRS and dual-symbol DMRS respectively.
  • CDM group 0 includes DMRS port 0 and DMRS port 1; CDM group 1 includes DMRS port 2 and DMRS port 3.
  • CDM Group 0 and CDM Group 1 are frequency division multiplexed (mapped on different frequency domain resources).
  • the DMRS ports included in the CDM group are mapped to the same time-frequency resources.
  • the DMRS sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences, thereby ensuring the orthogonality of the DMRS ports in the CDM group and suppressing interference between DMRS transmitted on different DMRS ports.
  • the mask sequence may be an orthogonal cover code (OCC) sequence.
  • DMRS port 0 and DMRS port 1 are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner. That is, the adjacent frequency domain resources occupied by DMRS port 0 and DMRS port 1 are separated by one sub-second. carrier.
  • two adjacent subcarriers occupied in the frequency domain correspond to a frequency domain mask sequence of length 2, for example, it can be (+1, +1) or (+1, -1); occupied in the time domain
  • a time domain symbol of corresponds to a time domain mask sequence of length 1, for example, it can be (+1); according to the frequency domain mask sequence and the time domain mask sequence, the length of the mask sequence corresponding to the DMRS port can be obtained as 2 (The mask sequence corresponding to the DMRS port can be composed of a frequency domain mask sequence and a time domain mask sequence through the Kronecker product).
  • DMRS port 0 and DMRS port 1 can perform code division multiplexing through a mask sequence of length 2.
  • the mask sequence corresponding to DMRS port 0 is (+1, +1)
  • the mask sequence corresponding to DMRS port 1 is (+1, -1).
  • DMRS port 2 and DMRS port 3 are located in the same RE, and are mapped to the unoccupied REs of DMRS port 0 and DMRS port 1 in a comb-tooth manner in the frequency domain.
  • DMRS port 2 and DMRS port 3 can perform code division multiplexing through a mask sequence of length 2.
  • the mask sequence corresponding to DMRS port 2 is (+1, +1)
  • the mask sequence corresponding to DMRS port 3 is (+1, -1).
  • CDM group 0 includes DMRS port 0, DMRS port 1, DMRS port 4 and DMRS port 5; CDM group 1 includes DMRS port 2, DMRS port 3, DMRS port 6 and DMRS port 7.
  • CDM group 0 and CDM group 1 are frequency division multiplexers.
  • the DMRS ports included in the CDM group are mapped to the same time-frequency resources.
  • the DMRS sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences.
  • DMRS port 0, DMRS port 1, DMRS port 4 and DMRS port 5 are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner, that is, DMRS port 0, DMRS port 1, DMRS port 4 and Adjacent frequency domain resources occupied by DMRS port 5 are separated by one subcarrier.
  • two adjacent subcarriers occupied in the frequency domain correspond to a frequency domain mask sequence of length 2, for example, it can be (+1, +1) or (+1, -1); occupied in the time domain
  • Two adjacent time domain symbols correspond to a time domain mask sequence of length 2, for example, it can be (+1, +1) or (+1, -1); according to the frequency domain mask sequence and time domain mask
  • the sequence can be used to obtain that the length of the mask sequence corresponding to the DMRS port is 4 (the mask sequence corresponding to the DMRS port can be composed of a frequency domain mask sequence and a time domain mask sequence through the Kronecker product).
  • DMRS port 0, DMRS port 1, DMRS port 4 and DMRS port 5 can be code division multiplexed through a mask sequence of length 4 .
  • the mask sequence corresponding to DMRS port 0 is (+1, +1, +1, +1)
  • the mask sequence corresponding to DMRS port 1 is (+1, +1, -1, -1).
  • the mask sequence corresponding to 4 is (+1, -1, +1, -1)
  • the mask sequence corresponding to DMRS port 5 is (+1, -1, -1, +1).
  • DMRS port 2, DMRS port 3, DMRS port 6 and DMRS port 7 are located in the same RE and are mapped to DMRS port 0, DMRS port 1, DMRS port 4 and DMRS port 5 in a comb-tooth manner in the frequency domain. on the occupied subcarriers.
  • DMRS port 2, DMRS port 3, DMRS port 6 and DMRS port 7 can perform code division multiplexing through a mask sequence of length 4.
  • the mask sequence corresponding to DMRS port 2 is (+1, +1, +1, +1), and the mask sequence corresponding to DMRS port 3 is (+1, +1, -1, -1).
  • the corresponding mask sequence for 6 is (+1, -1, +1, -1),
  • the mask sequence corresponding to DMRS port 7 is (+1, -1, -1, +1).
  • w f (k′), w t (l′) and ⁇ corresponding to DMRS port p can be determined according to Table 2.
  • Table 2 Parameter values corresponding to different DMRS ports (type 2)
  • ⁇ is the index of the CDM group to which DMRS port p belongs, and DMRS ports in the same CDM group occupy the same time-frequency resources.
  • the time-frequency resources mapped by DMRS sequences corresponding to different DMRS ports can be determined, as shown in (b) of Figure 2.
  • the time domain symbol length occupied by the DMRS port can be 1 or 2.
  • the time domain symbol length occupied by the DMRS port is 1, it can be called single-symbol DMRS.
  • the time domain symbol length occupied by the DMRS port is 2, it can be Called dual-symbol DMRS.
  • the following is an introduction to single-symbol DMRS and dual-symbol DMRS respectively.
  • CDM group 0 includes DMRS port 0 and DMRS port 1; CDM group 1 includes DMRS port 2 and DMRS port 3; CDM group 2 includes DMRS port 4 and DMRS port 5.
  • Frequency division multiplexing is used between CDM groups, and the DMRS corresponding to the DMRS ports included in the CDM group are mapped on the same time-frequency resources.
  • the DMRS sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences. For a DMRS port, its corresponding DMRS sequence is mapped in multiple resource sub-blocks containing two consecutive sub-carriers in the frequency domain, and adjacent resource sub-blocks are separated by four sub-carriers in the frequency domain.
  • DMRS port 0 and DMRS port 1 are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner.
  • resource mapping is performed in the frequency domain in a comb-tooth manner.
  • DMRS port 0 and DMRS port 1 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7.
  • DMRS port 2 and DMRS port 3 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9.
  • DMRS port 4 and DMRS port 5 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11.
  • the two DMRS ports included in a CDM group they are code division multiplexed through a mask sequence of length 2 in two adjacent subcarriers.
  • the mask sequences corresponding to the two DMRS ports are (+1 , +1), (+1, -1).
  • CDM group 0 includes DMRS port 0, DMRS port 1, DMRS port 6 and DMRS Port 7
  • CDM group 1 includes DMRS port 2, DMRS port 3, DMRS port 8 and DMRS port 9
  • CDM group 2 includes DMRS port 4, DMRS port 5, DMRS port 10 and DMRS port 11.
  • Frequency division multiplexing is used between CDM groups, and the DMRS corresponding to the DMRS ports included in the CDM group are mapped on the same time-frequency resources.
  • the DMRS sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences.
  • For a DMRS port its corresponding DMRS sequence is mapped in multiple resource sub-blocks containing two consecutive sub-carriers in the frequency domain, and adjacent resource sub-blocks are separated by four sub-carriers in the frequency domain.
  • DMRS port 0, DMRS port 1, DMRS port 6 and DMRS port 7 are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner.
  • resource mapping is performed in the frequency domain in a comb-tooth manner.
  • DMRS port 0, DMRS port 1, DMRS port 6 and DMRS port 7 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier corresponding to time domain symbol 0 and time domain symbol 1 7.
  • DMRS port 2, DMRS port 3, DMRS port 8 and DMRS port 9 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9 corresponding to time domain symbol 1 and time domain symbol 2.
  • DMRS port 4, DMRS port 5, DMRS port 10 and DMRS port 11 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11 corresponding to time domain symbol 1 and time domain symbol 2.
  • code division multiplexing is performed through a mask sequence of length 4 in the two adjacent subcarriers corresponding to the 2 time domain symbols.
  • the mask sequence corresponding to the 4 DMRS ports The code sequences are (+1, +1, +1, +1), (+1, +1, -1, -1), (+1, -1, +1, -1), (+1, -1, -1, +1).
  • the access network device When the access network device and the terminal device communicate through the control channel or the data channel, the access network device needs to indicate to the terminal device the DMRS port allocated to the terminal device.
  • the following describes a possible implementation in which the access network device indicates to the terminal device the DMRS port allocated to the terminal device with reference to FIG. 3 .
  • Figure 3 is a schematic flow chart corresponding to the communication method provided by the embodiment of the present application. As shown in Figure 3, the process may include:
  • the access network device sends indication information 1 to the terminal device.
  • the indication information 1 indicates that the configuration type of DMRS is configuration type 1 or configuration type 2; accordingly, the terminal device receives the indication information 1.
  • the access network device may send the indication information 1 to the terminal device through an RRC message.
  • the access network device sends indication information 2 to the terminal device.
  • the indication information 2 indicates that the maximum symbol length occupied by the DMRS port is 1 or 2; accordingly, the terminal device receives the indication information 2.
  • the maximum symbol length occupied by a DMRS port refers to the maximum symbol length (or number) that DMRS can occupy.
  • the symbol length actually occupied by DMRS sent by the sending end (such as access network equipment or terminal equipment) Can be less than or equal to the maximum symbol length.
  • the maximum symbol length is 2
  • the actual symbol length occupied by the DMRS sent by the transmitter may be 1 or 2.
  • the maximum symbol length is 1, in a transmission schedule, the actual symbol length occupied by the DMRS sent by the sender may be 1.
  • the access network device may send the indication information 2 to the terminal device through an RRC message.
  • Instruction information 1 and indication information 2 may be carried in the same message, or may be carried in different messages.
  • the access network device may not send the instruction information 2 to the terminal device.
  • the terminal device may default to the maximum symbol length occupied by the DMRS port being 1.
  • the access network device sends indication information 3 to the terminal device, and the indication information 3 indicates the index value; further, the terminal device can receive the indication information 3.
  • the access network device may send messages through media access control (MAC) layer messages (such as MAC control element (CE)) or physical layer messages (such as downlink control information (Downlink)). control information (DCI)) sends instruction information 3 to the terminal device.
  • MAC media access control
  • CE MAC control element
  • DCI downlink control information
  • the terminal device determines the DMRS port allocated by the access network device to the terminal device based on the configuration type indicated by the indication information 1, the maximum symbol length occupied by the DMRS port indicated by the indication information 2, and the index value indicated by the indication information 3.
  • the terminal device can, based on the allocated DMRS port, follow the DMRS symbol generation method and time-frequency resource mapping rules defined in the protocol, Receive the DMRS sent by the access network equipment on the corresponding time-frequency resources, and perform the corresponding channel estimation process; for uplink transmission, the terminal equipment can be based on the allocated DMRS port and follow the DMRS symbol generation method and time-frequency resources defined by the protocol. Mapping rules, sending DMRS to the access network device on the corresponding time-frequency resources.
  • the terminal device can determine that the access network device is the terminal according to Table 3A or Table 3B and the index value indicated by the indication information 3.
  • DMRS port assigned by the device can be defined by the protocol. For example, when the terminal device receives DCI, and there is at least one field value (codepoint) in the "Transmission Configuration Indication" field in the DCI corresponding to 2 transmission configuration instructions ( transmission configuration indication, TCI) state, the terminal device can use Table 3B, otherwise, the terminal device can use Table 3A.
  • Table 3A Configuration type 1, the maximum symbol length occupied by the DMRS port is 1
  • Table 3B Configuration type 1, the maximum symbol length occupied by the DMRS port is 1
  • the terminal device can determine that the access network device is the terminal.
  • the DMRS ports allocated by the device are DMRS port 0 to DMRS port 1 corresponding to type1 single symbol DMRS.
  • the terminal device can determine the access network device allocated to the terminal device.
  • DMRS ports include DMRS port 0 and DMRS port 1 corresponding to type 1 single symbol DMRS to DMRS port 3.
  • the CDM group that does not carry data when the number of CDM groups that do not carry data is 1, the CDM group that does not carry data can be CDM group 0; when the number of CDM groups that do not carry data is 2, it does not carry data.
  • the CDM group may include CDM group 0 and CDM group 1; when the number of CDM groups that do not carry data is 3, the CDM group that does not carry data may include CDM group 0, CDM group 1 and CDM group 3.
  • the "number of CDM groups that do not carry data" involved in other tables in the embodiment of this application can be processed with reference.
  • the terminal device can determine the access network device as the terminal device by using the index value indicated in Table 4A or Table 4B and indication information 3. Assigned DMRS port.
  • whether the terminal device specifically uses Table 4A or Table 4B may refer to the above description of whether the terminal device uses Table 3A or Table 3B.
  • Table 4A Configuration type 1, the maximum symbol length occupied by the DMRS port is 2
  • Table 4B Configuration type 1, the maximum symbol length occupied by the DMRS port is 2
  • the DMRS ports are DMRS port 0 to DMRS port 1 corresponding to type1 single symbol DMRS.
  • the terminal device can determine that the DMRS port allocated by the access network device to the terminal device is DMRS port 0 to DMRS port 0 corresponding to type1 dual-symbol DMRS.
  • the terminal device can determine the access network device as the terminal device by using the index value indicated in Table 5A or Table 5B and the indication information 3. Assigned DMRS port.
  • whether the terminal device specifically uses Table 5A or Table 5B may refer to the above description of whether the terminal device uses Table 3A or Table 3B.
  • Table 5A Configuration type 2, the maximum symbol length occupied by the DMRS port is 1
  • Table 5B Configuration type 2, the maximum symbol length occupied by the DMRS port is 1
  • the terminal device can Determine that the DMRS ports allocated by the access network equipment to the terminal equipment are DMRS port 0 to DMRS port 5 corresponding to type2 single symbol DMRS. DMRS port 1.
  • the terminal device can determine the access network device as the terminal device by using the index value indicated in Table 6A or Table 6B and indication information 3. Assigned DMRS port.
  • whether the terminal device specifically uses Table 6A or Table 6B may refer to the above description of whether the terminal device uses Table 3A or Table 3B.
  • Table 6A Configuration type 2, the maximum symbol length occupied by the DMRS port is 2
  • Table 6B Configuration type 2, the maximum symbol length occupied by the DMRS port is 2
  • the terminal device can determine that the DMRS port allocated by the access network device to the terminal device is DMRS port 0 corresponding to type 2 single symbol DMRS to DMRS port 1 of DMRS port 5. .
  • the terminal device can determine that the DMRS port allocated by the access network device to the terminal device is the DMRS port corresponding to type 2 dual-symbol DMRS 0 to DMRS port 1 in DMRS port 11.
  • each data stream can be called a spatial layer or spatial stream or transport stream, and one DMRS port can correspond to a spatial layer or transport stream.
  • the DMRS port indexes corresponding to the V spatial layers can be determined according to the order of the DMRS port indexes in the above-mentioned Table 3A to Table 6B.
  • V spatial layers include spatial layer 0 and spatial layer 1.
  • spatial layer 0 corresponds to DMRS port 0
  • spatial layer 1 corresponds to DMRS port. 1
  • the access network device is a terminal device and the respective DMRS port indexes are "2,3”
  • spatial layer 0 corresponds to DMRS port 2
  • spatial layer 1 corresponds to DMRS port 3.
  • the maximum 12 DMRS ports cannot guarantee more than 12 transmission streams. Therefore, in order to support more transmission streams, the DMRS port needs to be expanded.
  • the DMRS ports can be expanded through code division multiplexing, or the DMRS ports can be expanded through frequency division multiplexing.
  • the following takes the expansion of DMRS ports through code division multiplexing as an example to introduce the relevant content of expanding DMRS ports.
  • DMRS port 0 to DMRS port 7 can be called existing DMRS ports
  • DMRS port 8 to DMRS port 15 are expanded DMRS ports and can be called new DMRS ports.
  • the time-frequency resources corresponding to the existing DMRS port and the new DMRS port are the same.
  • Figure 4 the vertical direction represents the frequency domain
  • the horizontal direction represents the time domain
  • a square represents an RE
  • an RE corresponds to a subcarrier in the frequency domain and a time domain symbol in the time domain.
  • Figure 4 shows the existing DMRS ports and the new DMRS ports separated for ease of introduction. Figure 4 only illustrates the situation of one RB, and the situation of multiple RBs can be processed with reference.
  • a CDM group includes 4 DMRS ports, mapped on 2 subcarriers and 2 time domain symbols (ie, 4 REs).
  • This CDM group corresponds to the existing DMRS port 0, DMRS port 1, DMRS port 4, and DMRS port 5, and the occupation index in one RB is 0. /2/4/6/8/10 subcarriers; the 4 DMRS ports of this CDM group can be code division multiplexed through an inner mask sequence of length 4.
  • each DMRS port can correspond to an inner frequency domain mask sequence of length 2 and an inner time domain mask sequence of length 2, that is, each DMRS port can correspond to an inner layer mask sequence of length 4.
  • each element in the inner mask sequence corresponds to 4 REs one-to-one.
  • the inner layer mask sequence with a length of 4 can be composed of the corresponding inner layer frequency domain mask sequence and the inner layer time domain mask sequence through Kronecker product.
  • the inner mask sequences corresponding to any two DMRS ports among the four DMRS ports of a CDM group are orthogonal.
  • the inner mask sequence (w 1 , w 2 , w 3 , w 4 ) corresponding to DMRS port 0 is (+1+1+1+1); the inner mask sequence corresponding to DMRS port 1 (w 1 ,w 2 ,w 3 ,w 4 ) can be (+1+1-1-1); the inner layer corresponding to DMRS port 4
  • the mask sequence (w 1 , w 2 , w 3 , w 4 ) can be (+1-1+1-1); the inner mask sequence corresponding to DMRS port 5 (w 1 , w 2 , w 3 , w 4 ) can be (+1-1-1+1).
  • the new DMRS port can also correspond to 2 CDM groups, and each CDM group corresponds to 4 DMRS ports.
  • a CDM group corresponds to 4 DMRS ports, which are mapped on 2 subcarriers and 2 time domain symbols (i.e. 4 REs).
  • this CDM group corresponds to the newly added DMRS port 8, DMRS port 9, DMRS port 12, and DMRS port 13, and the occupied index in one RB is 0. /2/4/6/8/10 subcarriers; the 4 DMRS ports of this CDM group can be code division multiplexed through an inner mask sequence of length 4.
  • each DMRS port can correspond to an inner frequency domain mask sequence of length 2 and an inner time domain mask sequence of length 2, that is, each DMRS port can correspond to an inner layer mask sequence of length 4.
  • Mask sequence (expressed as (c 1 , c 2 , c 3 , c 4 )), each element in the inner mask sequence corresponds to 4 REs one-to-one.
  • the inner layer mask sequence with a length of 4 can be composed of the corresponding inner layer frequency domain mask sequence and the inner layer time domain mask sequence through Kronecker product.
  • the inner mask sequences corresponding to any two DMRS ports among the four DMRS ports of a CDM group are orthogonal. Two possible implementations of the inner mask sequence are described below in conjunction with Example a1 and Example a2.
  • the inner mask sequence (c 1 , c 2 , c 3 , c 4 ) corresponding to DMRS port 8 can be (+1, +1, +1, +1); the inner mask sequence corresponding to DMRS port 9
  • the code sequence (c 1 , c 2 , c 3 , c 4 ) can be (+1, +1, -1, -1); the inner mask sequence corresponding to DMRS port 12 (c 1 , c 2 , c 3 , c 4 ) can be (+1, -1, +1, -1);
  • the inner mask sequence (c 1 , c 2 , c 3 , c 4 ) corresponding to DMRS port 13 can be (+1, - 1, -1, +1).
  • the inner mask sequence (c 1 , c 2 , c 3 , c 4 ) corresponding to DMRS port 8 can be (+1, +j, +j, -1); the inner mask sequence corresponding to DMRS port 9
  • the code sequence (c 1 , c 2 , c 3 , c 4 ) can be (+1, +j, -j, +1);
  • the inner mask sequence corresponding to DMRS port 12 (c 1 , c 2 , c 3 , c 4 ) can be (+1, -j, +j, +1);
  • the inner mask sequence (c 1 , c 2 , c 3 , c 4 ) corresponding to DMRS port 13 can be (+1, - j,-j,-1).
  • the existing 4 DMRS ports (such as DMRS port 0, DMRS port 1, DMRS port 4, DMRS port 5 ) and the four newly added DMRS ports (such as DMRS port 8, DMRS port 9, DMRS port 12, DMRS port 13) can pass the outer mask sequence of length 4 (b 1 , b 2 , b 3 , b 4 ) for code division multiplexing.
  • the existing 4 DMRS ports (such as DMRS port 0, DMRS port 1, DMRS port 4, DMRS port 5) and the new 4 DMRS ports (such as DMRS port 8, DMRS port 9, DMRS port 12, DMRS port 13) can perform code division multiplexing through an outer mask sequence (b 1 , b 2 , b 3 , b 4 ) of length 4.
  • the outer mask sequences (b 1 , b 2 , b 3 , b 4 ) corresponding to the existing 4 DMRS ports are, for example, (+1, +1, +1, +1), and the newly added 4
  • the outer mask sequence (b 1 , b 2 , b 3 , b 4 ) corresponding to the DMRS port is, for example, (+1, +1, -1, -1).
  • These two outer mask sequences are orthogonal.
  • one element of the outer mask sequence (b 1 , b 2 , b 3 , b 4 ) corresponds to one subcarrier in a group of subcarriers.
  • subcarrier 0 corresponds to sequence element b 1
  • subcarrier 2 corresponds to sequence element b 2
  • subcarrier 4 corresponds to sequence element b 3
  • subcarrier 6 corresponds to sequence element b 4 .
  • DMRS port 0 to DMRS port 11 can be called existing DMRS ports
  • DMRS port 12 to DMRS port 23 are expanded DMRS ports and can be called new DMRS ports.
  • the time-frequency resources corresponding to the existing DMRS port and the new DMRS port are the same.
  • a CDM group includes 4 DMRS ports, mapped in 2 subcarriers and 2 time domain symbols (i.e. 4 REs).
  • This CDM group corresponds to the existing DMRS port 0, DMRS port 1, DMRS port 6, and DMRS port 7, and the occupation index in one RB is 0. /1//6/7 subcarriers; the 4 DMRS ports of this CDM group can be code division multiplexed through an inner mask sequence of length 4.
  • each DMRS port can correspond to an inner frequency domain mask sequence of length 2 and an inner time domain mask sequence of length 2, that is, each DMRS port can correspond to an inner layer mask sequence of length 4.
  • each element in the inner mask sequence corresponds to 4 REs one-to-one.
  • the inner layer mask sequence with a length of 4 can be composed of the corresponding inner layer frequency domain mask sequence and the inner layer time domain mask sequence through Kronecker product.
  • the inner mask sequences corresponding to any two DMRS ports among the four DMRS ports of a CDM group are orthogonal.
  • the inner mask sequence (w 1 , w 2 , w 3 , w 4 ) corresponding to DMRS port 0 is (+1, +1, +1, +1); the inner mask sequence corresponding to DMRS port 1 (w 1 ,w 2 ,w 3 ,w 4 ) can be (+1, +1, -1, -1); the inner mask sequence corresponding to DMRS port 6 (w 1 ,w 2 ,w 3 ,w 4 ) can be (+1, -1, +1, -1); the inner mask sequence (w 1 , w 2 , w 3 , w 4 ) corresponding to DMRS port 7 can be (+1, -1, -1, +1).
  • the new DMRS port can also correspond to 2 CDM groups, and each CDM group corresponds to 4 DMRS ports.
  • a CDM group corresponds to 4 DMRS ports, which are mapped on 2 subcarriers and 2 time domain symbols (i.e. 4 REs).
  • this CDM group corresponds to the newly added DMRS port 12, DMRS port 13, DMRS port 18, and DMRS port 19, and the occupied index in one RB is 0. /1//6/7 subcarriers; the 4 DMRS ports of this CDM group can be code division multiplexed through an inner mask sequence of length 4.
  • each DMRS port can correspond to an inner frequency domain mask sequence of length 2 and an inner time domain mask sequence of length 2, that is, each DMRS port can correspond to an inner layer mask sequence of length 4.
  • Mask sequence (expressed as (c 1 , c 2 , c 3 , c 4 )), each element in the inner mask sequence corresponds to 4 REs one-to-one.
  • the inner layer mask sequence with a length of 4 can be composed of the corresponding inner layer frequency domain mask sequence and the inner layer time domain mask sequence through Kronecker product.
  • the inner mask sequences corresponding to any two DMRS ports among the four DMRS ports of a CDM group are orthogonal. Two possible implementations of the inner mask sequence are described below in conjunction with Example b1 and Example b2.
  • the inner mask sequence (c 1 , c 2 , c 3 , c 4 ) corresponding to DMRS port 12 can be (+1, +1, +1, +1); the inner mask sequence corresponding to DMRS port 13
  • the code sequence (c 1 , c 2 , c 3 , c 4 ) can be (+1, +1, -1, -1); the inner mask sequence corresponding to DMRS port 18 (c 1 , c 2 , c 3 , c 4 ) can be (+1, -1, +1, -1);
  • the inner mask sequence (c 1 , c 2 , c 3 , c 4 ) corresponding to DMRS port 19 can be (+1, - 1, -1, +1).
  • the inner mask sequence (c 1 , c 2 , c 3 , c 4 ) corresponding to DMRS port 12 can be (+1, +j, +j, -1); the inner mask sequence corresponding to DMRS port 13
  • the code sequence (c 1 , c 2 , c 3 , c 4 ) can be (+1, +j, -j, +1); the inner mask sequence (c 1 , c 2 , c 3 corresponding to DMRS port 18 ,c 4 ) can be (+1, -j, +j, +1);
  • the inner mask sequence (c 1 ,c 2 ,c 3 ,c 4 ) corresponding to DMRS port 19 can be (+1, - j,-j,-1).
  • the existing 4 DMRS ports (such as DMRS port 0, DMRS port 1, DMRS port 6, DMRS port 7 ) and the four newly added DMRS ports (such as DMRS port 12, DMRS port 13, DMRS port 18, DMRS port 19) can pass the outer mask sequence of length 4 (b 1 , b 2 , b 3 , b 4 ) for code division multiplexing.
  • the existing 4 DMRS ports (such as DMRS port 0, DMRS port 1, DMRS port 6, DMRS port 7) and the new 4 DMRS ports (such as DMRS port 12, DMRS port 13, DMRS port 18, DMRS port 19) can perform code division multiplexing through an outer mask sequence (b 1 , b 2 , b 3 , b 4 ) of length 4.
  • the outer masks corresponding to the existing 4 DMRS ports The sequence (b 1 , b 2 , b 3 , b 4 ) is, for example, (+1, +1, +1, +1), and the outer mask sequence (b 1 , b 2 ) corresponding to the newly added four DMRS ports , b 3 , b 4 ) are for example (+1, +1, -1, -1), and these two outer mask sequences are orthogonal.
  • one element of the outer mask sequence (b 1 , b 2 , b 3 , b 4 ) corresponds to one subcarrier in a group of subcarriers. For example, subcarrier 0 corresponds to sequence element b 1 and subcarrier 1 corresponds to sequence Element b 2 , subcarrier 6 corresponds to sequence element b 3 , and subcarrier 7 corresponds to sequence element b 4 .
  • configuration type 1 single-symbol DMRS can support a maximum of 8 ports.
  • Configuration type 1 Dual-symbol DMRS can support a maximum of 16 ports.
  • Configuration type 2 and single-symbol DMRS can support a maximum of 12 ports.
  • Configuration type 2 and dual-symbol DMRS can support a maximum of 24 ports.
  • Table 7 Existing DMRS ports and new DMRS ports corresponding to different configuration types
  • the DMRS sequence corresponding to an existing DMRS port can be mapped to the corresponding time-frequency resource after multiplying it with the corresponding inner mask sequence and outer mask sequence through time-frequency resource mapping rules.
  • the DMRS sequence corresponding to a new DMRS port can be mapped to the corresponding time-frequency resource after multiplying it with the corresponding inner mask sequence and outer mask sequence through the time-frequency resource mapping rules.
  • p is the index of the DMRS port
  • ⁇ is the subcarrier spacing parameter
  • c t (l′) is the inner time domain mask sequence element corresponding to the time domain symbol with index l′
  • c f (k′) is the corresponding subcarrier with index k′
  • m 2n+k′, ⁇ is the subcarrier offset factor, It is the symbol index of the starting time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol.
  • s f (k′) is the frequency domain mask sequence element corresponding to the subcarrier with index k′
  • s t (l′) is the time domain mask sequence element corresponding to the time domain symbol with index l′.
  • the frequency domain mask sequence corresponding to each DMRS port can be equivalently expressed as the inner frequency domain mask sequence c f (k′) and the outer mask sequence ⁇ b (0),b(1) ⁇ product.
  • the outer mask sequence element b(0) corresponds to two adjacent subcarriers in a group of subcarriers occupied by the DMRS port, that is, the outer mask sequence element b(0) corresponds to c f (0) and c f ( 1).
  • the outer mask sequence element b(1) corresponds to the other two adjacent subcarriers in a group of subcarriers occupied by the DMRS port, that is, the outer mask sequence element b(1) corresponds to c f (0) and c f (1). Therefore, the length of the frequency domain mask sequence corresponding to each DMRS port is 4, which can be expressed as (c f (0)b(0),c f (1)b(0),c f (0)b(1) ,c f (1)b(1)). In the case where the DMRS ports are not expanded (refer to the previous description), the length of the frequency domain mask sequence corresponding to each DMRS port is 2.
  • the values of c f (k′), c t (l′) and ⁇ corresponding to DMRS port p can be determined according to the following Table 8A or Table 8B.
  • Table 8A when the inner mask sequence described in the above example a1 is used, the values of c f (k′), c t (l′) and ⁇ can be determined according to Table 8A; when the inner layer mask sequence described in the above example a2 is used
  • the values of c f (k′), c t (l′) and ⁇ can be determined according to Table 8B.
  • Table 8A Parameter values corresponding to different DMRS ports (type 1)
  • Table 8B Parameter values corresponding to different DMRS ports (type 1)
  • the values of c f (k′), c t (l′) and ⁇ corresponding to DMRS port p can be determined according to the following table 9A or 9B.
  • the values of c f (k′), c t (l′) and ⁇ can be determined according to Table 9A; when the inner layer mask sequence described in the above example b2 is used
  • the values of c f (k′), c t (l′) and ⁇ can be determined according to Table 9B.
  • Table 9A Parameter values corresponding to different DMRS ports (type 2)
  • Table 9B Parameter values corresponding to different DMRS ports (type 2)
  • embodiments of the present application will study how the access network device indicates to the terminal device the DMRS port allocated to the terminal device after the DMRS port is expanded.
  • a DMRS port index group can include one or more DMRS port indexes, and a DMRS port index group can be associated with an index value.
  • a set can include one or more DMRS port index groups.
  • the set includes N DMRS port index groups, when each DMRS port index group in the N DMRS port index groups contains When at least one DMRS port index among the M DMRS port indexes is included, it can be considered that the M DMRS port indexes correspond to the set.
  • M and N are positive integers.
  • Two DMRS port index groups belonging to different sets may have an association relationship.
  • the association relationship between the first DMRS port index group and the second DMRS port index group may include one or more of the following:
  • index values associated with the first DMRS port index group and the second DMRS port index group are the same.
  • the DMRS port indexes in the first DMRS port index group and the second DMRS port index group correspond one to one. For example, there may be an offset between two corresponding DMRS port indices.
  • the first DMRS port index group is a subset of the second DMRS port index group.
  • the second DMRS port index group may include the port index in the first DMRS port index group, and also include the DMRS port index corresponding to the DMRS port index in the first DMRS port index group.
  • the first DMRS port index group includes a first DMRS port index, and there is an offset between the DMRS port index corresponding to the first DMRS port index and the first DMRS port index.
  • the association relationship between the first DMRS port index group and the second DMRS port index group is the first association relationship or the second association relationship.
  • the first association relationship between the first DMRS port index group and the second DMRS port index group may include the above-mentioned 1 and 2
  • the second association relationship between the first DMRS port index group and the second DMRS port index group may include the above-mentioned 1 and 2.
  • the collection and DMRS port index group will be introduced in detail for different configuration types based on the first association relationship and the second association relationship.
  • Set 1 may include 12 DMRS port index groups associated with index values “0 ⁇ 11” in Table 3A.
  • Each DMRS port index group includes one or more DMRS port indexes.
  • the DMRS port indexes included in the DMRS port index group associated with the index value "2" are "0" and "1".
  • the correspondence between these four DMRS port indexes and set 1 can also be understood in this way:
  • Set 1 includes 12 DMRS port index groups.
  • the DMRS port indexes included in the port index group are all these 4.
  • Set 2 may include 12 DMRS port index groups associated with index values “0 ⁇ 11” in Table 10A.
  • the DMRS port index group included in set 2 has a first association relationship with the DMRS port index group included in set 1.
  • Table 10A Configuration type 1, the maximum symbol length occupied by the DMRS port is 1 (new DMRS port)
  • Table 10B Configuration type 1, the maximum symbol length occupied by the DMRS port is 1 (new DMRS port)
  • Table 10A corresponds to Table 3A
  • Table 10B corresponds to Table 3B.
  • set 1 includes DMRS port index group a1
  • DMRS port index group a1 is any DMRS port index group among the 12 DMRS port index groups shown in Table 3A
  • Set 2 includes DMRS port index group b1, which is any DMRS port index group among the 12 DMRS port index groups shown in Table 10A.
  • DMRS port index group a1 and DMRS port index group b1 have a first association relationship; specifically, DMRS port index group a1 and DMRS port index group b1 are associated with the same index value, and the DMRS port index in DMRS port index group a1 is the same as the DMRS port
  • the DMRS port indexes in the index group b1 have a one-to-one correspondence, and there is an offset between the corresponding DMRS port indexes.
  • the value of the offset can be determined according to the configuration type and the symbol length occupied by the DMRS port.
  • the value of the offset can be 4, that is, the value of the offset can be equal to the number of DMRS port indexes corresponding to set 1, or the offset.
  • the value of the shift amount can be equal to the maximum number of orthogonal DMRS ports supported by configuration type 1 and single-symbol DMRS.
  • the DMRS port index group a1 in Table 3A associated with the index value "0” includes a DMRS port index of "0”
  • the DMRS port index group b1 in Table 10A associated with the index value "0” includes a DMRS port index of "4"
  • the offset between DMRS port index "0" and "4" is 4.
  • the DMRS port index group a1 in Table 3A associated with the index value "2" includes DMRS port indexes "0" and “1”
  • the DMRS port index group b1 in Table 10A associated with the index value "2" includes The DMRS port indexes are "4" and "5". Among them, DMRS port indexes "0" and “4" correspond to each other, and the offset between them is 4; DMRS port indexes "1" and "5" correspond to each other, and the offset between them is 4.
  • 8 new DMRS port indexes corresponding to configuration type 1 and dual-symbol DMRS
  • take 1 Taking the case of codewords as an example, these 8 DMRS port indexes correspond to set 4, and set 4 may include 19 DMRS port index groups associated with the index values "12 ⁇ 30" in Table 11A.
  • the DMRS port index group included in set 4 has a first association relationship with the DMRS port index group included in set 3.
  • Table 11A Configuration type 1, the maximum symbol length occupied by the DMRS port is 2 (new DMRS port)
  • Table 11B Configuration type 1, the maximum symbol length occupied by the DMRS port is 2 (new DMRS port)
  • Table 11A corresponds to Table 4A
  • Table 11B corresponds to Table 4B.
  • set 3 includes DMRS port index group a2
  • DMRS port index group a2 is any DMRS port index group among the 19 DMRS port index groups shown in Table 4A
  • Set 4 includes DMRS port index group b2, which is any DMRS port index group among the 19 DMRS port index groups shown in Table 11A.
  • DMRS port index group a2 and DMRS port index group b2 have a first association relationship; specifically, DMRS port index group a2 and DMRS port index group b2 are associated with the same index value, and the port index in DMRS port index group a2 is the same as the DMRS port index.
  • the port indexes in group b2 have a one-to-one correspondence, and there is an offset between the corresponding port indexes.
  • the value of the offset can be determined according to the configuration type and the symbol length occupied by the DMRS port.
  • the offset value can be 8, that is, the offset value can be equal to the number of DMRS port indexes corresponding to set 3, or It is said that the value of the offset can be equal to the maximum number of orthogonal DMRS ports supported by configuration type 1 and dual-symbol DMRS.
  • the DMRS port index group a2 in Table 4A associated with the index value "12" includes the DMRS port index "0", and the DMRS port index group a2 in Table 11A associated with the index value "12"
  • the DMRS port index included in the port index group b2 is "8", and the offset between the DMRS port indexes "0" and "8" is 8.
  • the DMRS port index group a2 in Table 4A associated with the index value "20" includes DMRS port indexes "0" and “1”
  • the DMRS port index group b2 in Table 11A associated with the index value "20" includes The DMRS port indexes are “8" and "9". Among them, DMRS port indexes "0" and “8” correspond to each other, and the offset between them is 8; DMRS port indexes "1" and “9” correspond to each other, and the offset between them is 8.
  • DMRS port indexes i.e. "0 ⁇ 5"
  • set 5 includes 24 DMRS port index groups associated with index values "0 ⁇ 23" in Table 5A.
  • the DMRS port index corresponds to set 6, and set 6 may include 24 DMRS port index groups associated with index values “0 ⁇ 23” in Table 12A. Wherein, the DMRS port index group included in set 6 and the DMRS port index group included in set 5 have a first association relationship.
  • Table 12A Configuration type 2, the maximum symbol length occupied by the DMRS port is 1 (new DMRS port)
  • Table 12B Configuration type 2, the maximum symbol length occupied by the DMRS port is 1 (new DMRS port)
  • Table 12A corresponds to Table 5A
  • Table 12B corresponds to Table 5B.
  • set 5 includes DMRS port index group a3, and DMRS port index group a3 is any DMRS port index group among the 24 DMRS port index groups shown in Table 5A.
  • Set 6 includes DMRS port index group b3, which is any DMRS port index group among the 24 DMRS port index groups shown in Table 12A.
  • DMRS port index group a3 and DMRS port index group b3 have a first association relationship; specifically, DMRS port index group a3 and DMRS port index group b3 are associated with the same index value, and the port index in DMRS port index group a3 is the same as the DMRS port index.
  • the port indexes in group b3 have a one-to-one correspondence, and there is an offset between the corresponding port indexes.
  • the value of the offset can be determined according to the configuration type and the symbol length occupied by the DMRS port.
  • the offset value can be 6, that is, the offset value can be equal to the number of DMRS port indexes corresponding to set 5, or It is said that the value of the offset can be equal to the maximum number of orthogonal DMRS ports supported by configuration type 2 and single-symbol DMRS.
  • the DMRS port index group a3 in Table 5A associated with the index value "0” includes the DMRS port index "0", and the DMRS port index group a3 in Table 12A associated with the index value "0"
  • the DMRS port index included in the port index group b3 is "6"
  • the offset between the DMRS port indexes "0" and "6" is 6.
  • the DMRS port index group a3 in Table 5A associated with the index value "2" includes DMRS port indexes "0" and “1”
  • the DMRS port index group b3 in Table 12A associated with the index value "2" includes The DMRS port indexes are “6" and "7". Among them, DMRS port indexes "0" and “6” correspond to each other, and the offset between them is 6; DMRS port indexes "1" and “7” correspond to each other, and the offset between them is 6.
  • set 7 includes 34 DMRS port index groups associated with index values "24-57" in Table 6A.
  • the 8 new DMRS port indexes corresponding to configuration type 2 and dual-symbol DMRS, taking the case of 1 codeword in Table 13A as an example (Table 13B can be referred to for processing)
  • the DMRS port index corresponds to set 8
  • set 8 may include 34 DMRS port index groups associated with index values "24-57" in Table 13A.
  • the DMRS port index group included in set 8 has a first association relationship with the DMRS port index group included in set 7.
  • Table 13A Configuration type 2, the maximum symbol length occupied by the DMRS port is 2 (new DMRS port)
  • Table 13B Configuration type 2, the maximum symbol length occupied by the DMRS port is 2 (new DMRS port)
  • Table 13A corresponds to Table 6A
  • Table 13B corresponds to Table 6B.
  • set 7 includes DMRS port index group a4, which is any DMRS port index group among the 34 DMRS port index groups shown in Table 6A.
  • Set 8 includes DMRS port index group b4, which is any DMRS port index group among the 34 DMRS port index groups shown in Table 13A.
  • DMRS port index group a4 and DMRS port index group b4 have a first association relationship; specifically, DMRS port index group a4 and DMRS port index group b4 are associated with the same index value, and the port index in DMRS port index group a4 is the same as the DMRS port index
  • the port indexes in group b4 have a one-to-one correspondence, and there is an offset between the corresponding port indexes.
  • the value of the offset can be determined according to the configuration type and the symbol length occupied by the DMRS port.
  • the offset value can be 12, that is, the offset value can be equal to the number of DMRS port indexes corresponding to set 7, or It is said that the value of the offset can be equal to the maximum number of orthogonal DMRS ports supported by configuration type 2 and dual-symbol DMRS.
  • the DMRS port index group a4 in Table 6A associated with the index value "24” includes the DMRS port index "0", and the DMRS port index group a4 in Table 13A associated with the index value "24"
  • the DMRS port index included in the port index group b4 is “12”, and the offset between the DMRS port indexes “0” and “12” is 12.
  • the DMRS port index group a4 in Table 6A associated with the index value "36" includes DMRS port indexes "0" and “1”
  • the DMRS port index group b4 in Table 13A associated with the index value "36” includes The DMRS port indexes are "12" and "13". Among them, DMRS port index "0” corresponds to "12", and the offset between them is 12; DMRS port index "1” corresponds to "13”, and the offset between them is 12.
  • Set 1 may include 12 DMRS port index groups associated with index values “0 ⁇ 11” in Table 3A.
  • single-symbol DMRS can correspond to 8 DMRS port indexes (i.e. "0 ⁇ 7", where "0 ⁇ 3" is the existing DMRS port index, and "4 ⁇ 7” is the new DMRS port index).
  • Port index taking Table 14A as an example (Table 14B can be referred to for processing), these 8 DMRS port indexes correspond to set 2, and set 2 can include 12 DMRS port index groups associated with index values "0 ⁇ 11" in Table 14A.
  • the DMRS port index group included in set 2 has a second association relationship with the DMRS port index group included in set 1.
  • Table 14A Configuration type 1, the maximum symbol length occupied by the DMRS port is 1
  • Table 14B Configuration type 1, the maximum symbol length occupied by the DMRS port is 1
  • Table 14A corresponds to Table 3A
  • Table 14B corresponds to Table 3B.
  • set 1 includes DMRS port index group a1
  • DMRS port index group a1 is any DMRS port index group among the 12 DMRS port index groups shown in Table 3A
  • Set 2 includes DMRS port index group b1, which is any DMRS port index group among the 12 DMRS port index groups shown in Table 14A.
  • DMRS port index group a1 and DMRS port index group b1 have a second association relationship; specifically, DMRS port index group a1 and DMRS port index group b1 are associated with the same index value, and DMRS port index group a1 is a child of DMRS port index group b1 set.
  • the DMRS port index group b1 includes the DMRS port index group a1, and also includes the DMRS port index corresponding to the DMRS port index in the DMRS port index group a1, and there is an offset between the two corresponding DMRS port indexes.
  • the value of the offset can be determined according to the configuration type and the symbol length occupied by the DMRS port. When the configuration type is configuration type 1 and the symbol length occupied by the DMRS port is 1, the offset value can be 4.
  • the DMRS port index group a1 in Table 3A associated with the index value "0” includes the DMRS port index: "0”
  • the DMRS port index group b1 in Table 14A associated with the index value "0” includes DMRS port indexes "0" and "4"
  • the offset between the DMRS port indexes "0" and "4" is 4.
  • the DMRS port index group a1 in Table 3A associated with the index value "2" includes DMRS port indexes "0" and “1”
  • the DMRS port index group b1 in Table 14A associated with the index value "2" includes The DMRS port indexes are “0", “1", “4" and “5". Among them, DMRS port indexes "0” and “4" correspond to each other, and the offset between them is 4; DMRS port indexes "1" and "5" correspond to each other, and the offset between them is 4.
  • Figure 6 is a schematic flowchart corresponding to the communication method provided by the embodiment of the present application. As shown in Figure 6, the method may include:
  • the access network device sends first indication information to the terminal device; accordingly, the terminal device can receive the first indication information.
  • the first indication information may indicate a first index value
  • the first index value may be associated with a first port index group among a plurality of port index groups included in the first set and a plurality of port indexes included in the second set.
  • Second port index group within the group That is to say, the first port index group and the second port index group are associated with the same index value.
  • the first indication information may be carried on MAC CE or DCI.
  • the format adopted by the DCI may be, for example, DCI format 0_1, DCI format 0_2, DCI format1_1 or DCI format 1_2.
  • the access network device sends second indication information to the terminal device, where the second indication information indicates the first value or the second value; accordingly, the terminal device can receive the second indication information.
  • the first indication information when the second indication information indicates the first value, indicates the first port index group to the terminal device through the first index value.
  • the port index allocated by the access network device to the terminal device is the first port index group.
  • the second indication information indicates the second value
  • the first indication information indicates the second port index group to the terminal device through the first index value.
  • the port index allocated by the access network device to the terminal device is the second port. The port index in the index group.
  • the second indication information may be carried in the RRC message.
  • the second indication information may be the DMRS-Type field in the RRC message.
  • the first value is used to indicate the existing DMRS port corresponding to configuration type 1
  • the second value is used to indicate the new DMRS port corresponding to configuration type 1.
  • the first value can be "type1" and the second value can be " type1-E”.
  • the first value is used to indicate the existing DMRS port corresponding to configuration type 2
  • the second value is used to indicate the new DMRS port corresponding to configuration type 2.
  • the first value can be "type2" and the second value can be " type2-E”. That is to say, the second indication information may indicate any one of type1, type2, type1-E, and type2-E.
  • the access network device may also send fourth indication information to the terminal device.
  • the fourth indication information indicates the maximum symbol length occupied by the reference signal (such as DMRS).
  • the maximum symbol length may be length 1 (len1) or length 2. (len2), length 1 can refer to 1 symbol, length 2 can refer to 2 symbols.
  • the fourth indication information may be carried in the RRC message.
  • the fourth indication information may be the maxLength field in the RRC message.
  • the fourth indication information and the second indication information may be carried in the same message, or may be carried in different messages. When the fourth instruction letter The information and the second instruction information are carried in different messages.
  • the embodiment of the present application does not limit the order in which the access network device sends different messages.
  • a possible signaling structure of the RRC message is as follows:
  • the second indication information may be carried on MAC CE or DCI.
  • the second indication information and the first indication information may be carried in the same message, or may be carried in different messages, and are not specifically limited.
  • the first value is used to indicate an existing DMRS port
  • the second value is used to indicate a new DMRS port.
  • the second indication information includes 1 bit. When the bit value is "0", it indicates an existing DMRS port. When the bit value is "1", it indicates a new DMRS port.
  • the access network device may also send fourth indication information and fifth indication information to the terminal device.
  • the fourth indication information indicates the maximum symbol length occupied by the reference signal (such as DMRS), and the fifth indication information indicates the reference signal (such as DMRS).
  • DMRS reference signal
  • the fifth indication information may indicate "type1" or "type2".
  • the fifth indication information may be carried in the RRC message.
  • the fifth indication information may be the DMRS-Type field in the RRC message.
  • the fourth indication information and the fifth indication information may be carried in the same message, or may be carried in different messages.
  • Scenario 1 The second indication information indicates "type1" or "type1-E”.
  • the terminal device may determine based on the second indication information that the first indication information indicates the first port index group in the first set.
  • the second indication information indicates the second value, for example, the second indication information indicates "type1-E"
  • the terminal device can determine the first indication based on the second indication information.
  • the information indicates a second port index group in the second set.
  • the terminal device can determine based on the second indication information
  • the first indication information 2 indicates the first port index group in the first set, and the port indexes included in the first port index group are "0" and "1"; if the second indication information indicates "type1-E", then the terminal device According to the second indication information, it can be determined that the first indication information indicates the second port index group in the second set, and the port indexes included in the second port index group are "4" and "5".
  • the terminal device may determine the port index group indicated by the first indication information through multiple methods, such as method one and method two.
  • the multiple port index groups included in the first set are shown in Table 3A, and the multiple port index groups included in the second set are shown in Table 10A; or, the multiple port index groups included in the first set are shown in Table 3B. It is shown that multiple port index groups included in the second set are shown in table 10B.
  • the terminal device may determine that the table to be queried is Table 3A (Table 3A is taken as an example here, and Table 3B may be processed by reference).
  • Table 3A is taken as an example here, and Table 3B may be processed by reference.
  • the terminal device can determine based on the first index value and Table 3A that the first indication information indicates the first port index group, and the port index included in the first port index group are "0" and "1".
  • the terminal device can determine that the table to be queried is table 10A (here, table 10A is taken as an example, and table 10B can be processed by reference).
  • the terminal device can determine, based on the first index value and table 10A, that the first indication information indicates the second port index group, and the port index included in the second port index group for "4" and "5".
  • the access network device can be determined to be the terminal device by querying the table corresponding to the new DMRS port.
  • the allocated ports since the table corresponding to the new DMRS port can be designed with reference to the table corresponding to the existing DMRS port, the implementation complexity can be effectively reduced.
  • the plurality of port index groups included in the first set are shown in Table 3A or Table 3B, and the plurality of port index groups included in the second set are shown in Table 3A or Table 3B.
  • the shift amount is obtained.
  • the terminal device can determine that the table to be queried is Table 3A (Table 3A is taken as an example here, and Table 3B can be processed by reference).
  • Table 3A is taken as an example here, and Table 3B can be processed by reference.
  • the terminal device can determine based on the first index value and Table 3A that the first indication information indicates the first port index group, and the port index included in the first port index group are "0" and "1".
  • the terminal device can determine the first port index group based on the first index value.
  • the first port index group includes The port indexes are "0" and "1". Further, since the first indication information indicates the second port index group in the second set, the terminal device determines the port index "0" and "1" in the first port index group and the offset (value is 4), and the port indexes of the second port index group are “4” and “5”.
  • the table corresponding to the existing DMRS port can be reused, thus effectively reducing the complexity of implementation. .
  • the terminal device can determine based on the second indication information that the first indication information indicates the type 1.
  • the first port index group in a set, the port indexes included in the first port index group are "0" and "1"; if the second indication information indicates "type1-E", the terminal device can determine according to the second indication information
  • the first indication information indicates a second port index group in the second set, and the second port index group includes port indexes "4" and "5".
  • the terminal device may determine the port index group indicated by the first indication information through multiple methods, such as method one and method two.
  • the multiple port index groups included in the first set are shown in Table 4A, and the multiple port index groups included in the second set are shown in Table 11A; or, the multiple port index groups included in the first set are shown in Table 4B. It is shown that multiple port index groups included in the second set are shown in Table 11B.
  • the terminal device may determine that the table to be queried is Table 4A (Table 4A is taken as an example here, and Table 4B may be processed by reference).
  • Table 4A is taken as an example here, and Table 4B may be processed by reference.
  • the terminal device can determine based on the first index value and Table 4A that the first indication information indicates the first port index group, and the port index included in the first port index group are "0" and "1".
  • the terminal device can determine that the table to be queried is 11A (here, table 11A is taken as an example, and table 11B can be processed by reference).
  • the terminal device can determine, based on the first index value and table 11A, that the first indication information indicates the second port index group, and the port index included in the second port index group for "8" and "9".
  • the plurality of port index groups included in the first set are shown in Table 4A or Table 4B, and the plurality of port index groups included in the second set are shown in Table 4A or Table 4B.
  • the shift amount is obtained.
  • the terminal device may determine that the table to be queried is Table 4A (Table 4A is taken as an example here, and Table 4B may be processed by reference).
  • the terminal device can determine, based on the first index value and Table 4A, that the first indication information indicates the first port index group, and the port index included in the first port index group are "0" and "1".
  • the terminal device can determine the first port index group based on the first index value.
  • the ports included in the first port index group The indices are “0" and "1”. Further, since the second indication information indicates the second port index group in the second set, the terminal device determines the port index "0" and "1" in the first port index group and the offset (value is 8), and the port indexes of the second port index group are “8” and “9”.
  • Scenario 2 The second indication information indicates “type2" or "type2-E”.
  • the terminal device may determine based on the second indication information that the first indication information indicates the first port index group in the first set.
  • the terminal device may determine based on the second indication information that the first indication information indicates the second port index group in the second set.
  • the terminal device can determine based on the second indication information first instruction letter The information indicates the first port index group in the first set, and the port indexes included in the first port index group are "0" and "1"; if the second indication information indicates "type2-E", the terminal device The information may determine that the first indication information indicates a second port index group in the second set, and the second port index group includes port indexes "6" and "7".
  • the terminal device may determine the port index group indicated by the first indication information through multiple methods, such as method one and method two.
  • the multiple port index groups included in the first set are shown in Table 5A, and the multiple port index groups included in the second set are shown in Table 12A; or, the multiple port index groups included in the first set are shown in Table 5B. It is shown that multiple port index groups included in the second set are shown in Table 12B.
  • the terminal device can determine that the table to be queried is Table 5A (Table 5A is taken as an example here, and Table 5B can be processed by reference).
  • the terminal device can determine, based on the first index value and Table 5A, that the first indication information indicates the first port index group, and the port index included in the first port index group are "0" and "1".
  • the terminal device can determine the table that needs to be queried, for example, the table that needs to be queried is 12A (here, table 12A is taken as an example, and table 12B can be processed by reference).
  • the terminal device can determine, based on the first index value and table 12A, that the first indication information indicates the second port index group, and the port index included in the second port index group for "6" and "7".
  • the plurality of port index groups included in the first set are shown in Table 5A or Table 5B, and the plurality of port index groups included in the second set are shown in Table 5A or Table 5B.
  • the shift amount is obtained.
  • the terminal device may determine that the table to be queried is Table 5A (Table 5A is taken as an example here, and Table 5B may be processed by reference).
  • the terminal device can determine, based on the first index value and Table 5A, that the first indication information indicates the first port index group, and the port index included in the first port index group are "0" and "1".
  • the terminal device can determine the first port index group based on the first index value.
  • the ports included in the first port index group The indices are “0" and "1”. Further, since the second indication information indicates the second port index group in the second set, the terminal device determines the port index "0" and “1” in the first port index group and the offset (value is 6), and the port indexes of the second port index group are “6” and “7”.
  • the terminal device can determine based on the second indication information that the first indication information indicates the type 2.
  • the first port index group in a set the port indexes included in the first port index group are "0" and "1"; if the second indication information indicates "type2-E", the terminal device can determine according to the second indication information
  • the first indication information indicates a second port index group in the second set, and the second port index group includes port indexes "12" and "13".
  • the terminal device may determine the port index group indicated by the first indication information through multiple methods, such as method one and method two.
  • the multiple port index groups included in the first set are shown in Table 6A, and the multiple port index groups included in the second set are shown in Table 13A; or, the multiple port index groups included in the first set are shown in Table 6B. shows that the second set The multiple port index groups included are shown in Table 13B.
  • the terminal device can determine the table that needs to be queried, for example, the table that needs to be queried is table 6A.
  • the terminal device can determine based on the first index value and Table 6A that the first indication information indicates the first port index group, and the port index included in the first port index group are "0" and "1".
  • the terminal device can determine the table that needs to be queried, for example, the table that needs to be queried is 13A.
  • the terminal device can determine, based on the first index value and table 13A, that the first indication information indicates the second port index group, and the port index included in the second port index group for "12" and "13".
  • the terminal device can determine the table that needs to be queried based on the configuration type, the symbol length occupied by the DMRS port, and other possible information.
  • the plurality of port index groups included in the first set are shown in Table 6A or Table 6B, and the plurality of port index groups included in the second set are shown in Table 6A or Table 6B.
  • the shift amount is obtained.
  • the terminal device can determine the table that needs to be queried, for example, the table that needs to be queried is table 6A.
  • the terminal device can determine based on the first index value and Table 6A that the first indication information indicates the first port index group, and the port index included in the first port index group are "0" and "1".
  • the terminal device can determine the first port index group based on the first index value.
  • the ports included in the first port index group The indices are “0" and "1". Further, since the second indication information indicates the second port index group in the second set, the terminal device determines the port index "0" and "1" in the first port index group and the offset (value is 12), and the port indexes of the second port index group are “12” and “13”.
  • the DMRS port indication method provided by the embodiment of the present application establishes an association relationship between the first port index group and the second port index group, and responds to different values indicated by the second indication information.
  • the DMRS port index group indicated by the first indication information has different interpretations, so that after the DMRS port is expanded, the indication overhead can be effectively reduced while indicating the DMRS port allocated to the terminal device.
  • the port indexes in the first port index group may all be existing DMRS port indexes
  • the second port index group The port indexes in can all be new DMRS port indexes, so that the DMRS ports allocated by the access network equipment to the terminal equipment will not include both existing DMRS ports and new DMRS ports, so as to better ensure the performance of channel estimation.
  • the DMRS ports allocated by the access network equipment to the terminal equipment can all be existing ports, or they can all be new ports, or some of them can be existing ports and the other part. Add a new port.
  • the DMRS port index allocated by the access network device to the terminal device can include at least one of 0, 1, 2, 3, 4, 5, 6, and 7, or it can also include 8 , at least one of 9,10,11,12,13,14,15, or it can also include at least one of 0,1,2,3,4,5,6,7 and 8,9,10, of 11,12,13,14,15 at least one.
  • 8 DMRS port indexes i.e.
  • 0 ⁇ 7 correspond to 19 DMRS port index groups.
  • 16 DMRS port indexes i.e. 0 ⁇ 16
  • Table 3A to Table 6B new Multiple DMRS port index groups. Therefore, after the new DMRS port is introduced, if the DMRS port indication method described in Figure 3 is used, other possible multiple DMRS port index groups need to be added to Table 3A to Table 6B, which will make the implementation more complicated. For example, when other possible multiple DMRS port index groups are added to Table 3A to Table 6B, the index value will also increase accordingly (the value of the index value will be relatively large), resulting in the access network equipment needing to pass more Bits are used to indicate the index value to the terminal device, and the signaling overhead is large.
  • DMRS symbol mapping corresponding to existing DMRS ports such as DMRS port 0, DMRS port 1, DMRS port 4, DMRS port 5) and new DMRS ports (such as DMRS port 8, DMRS port 9, DMRS port 12, DMRS port 13) in the same time and frequency resources.
  • the orthogonality of the four DMRS ports is guaranteed through (w 1 , w 2 , w 3 , w 4 ).
  • the orthogonality of the four DMRS ports is guaranteed through (c 1 , c 2 , c 3 , c 4 ). Therefore, the access network equipment allocates one or more DMRS ports to the terminal equipment in the existing DMRS ports and allocates one or more DMRS ports to the terminal equipment in the new DMRS ports, which has the same channel estimation effect.
  • the channels corresponding to the two subcarriers mapped by the inner mask sequence need to be the same. Guarantee orthogonality between any two existing DMRS ports. Similarly, the orthogonality between any two DMRS ports in the newly added DMRS ports is guaranteed by the inner mask sequence. Therefore, the channels corresponding to the two subcarriers mapped by the inner mask sequence need to be the same to ensure that any Orthogonality between 2 new DMRS ports. For existing DMRS ports and new DMRS ports, the orthogonality between them needs to be further ensured by the outer mask sequence. Therefore, 4 subcarriers mapped by 2 adjacent sets of inner mask sequences are required. Only when the corresponding channels (such as subcarrier 0, subcarrier 2, subcarrier 4 and subcarrier 6) are the same can the orthogonality between the existing DMRS port and the new DMRS port be guaranteed.
  • the DMRS ports allocated by the access network equipment to the terminal equipment are all existing DMRS ports or all new DMRS ports. Compared with the DMRS ports allocated by the access network equipment to the terminal equipment, some are existing DMRS ports and some are new DMRS ports. The new DMRS port has better performance.
  • the access network device allocates at least one DMRS port to the terminal device from the existing DMRS port or allocates at least one DMRS port to the terminal device from the new DMRS port, but not to the terminal device at the same time.
  • the performance of channel estimation can be better guaranteed and the implementation complexity can be effectively reduced.
  • the terminal device can send DMRS (i.e., uplink transmission) to the access network device on the time-frequency resource corresponding to the DMRS port.
  • DMRS ie, downlink transmission
  • the terminal device can send DMRS (ie, uplink transmission) to the access network device on the time-frequency resource corresponding to the DMRS port.
  • DMRS ie, downlink transmission
  • the terminal device can send DMRS (ie., uplink transmission) to the access network device on the time-frequency resource corresponding to the DMRS port.
  • DMRS i.e., downlink transmission
  • the terminal device performs uplink transmission or downlink transmission may be indicated by the access network device through other possible information, which is not limited in the embodiments of the present application.
  • the above method may also include:
  • the access network device sends the third instruction information to the terminal device; accordingly, the terminal device receives the third instruction information.
  • the third indication information may be carried on MAC CE or DCI.
  • the third indication information and the above-mentioned first indication information and/or second indication information may be carried in the same message (such as the same MAC CE or DCI), or they may be carried in different messages, with no specific limitation. That is to say, the access network device may send the first indication information, the second indication information and the third indication information to the terminal device through three messages respectively; or the access network device may also send the first indication information to the terminal device through two messages. Instruction information, second indication information and third indication information. In this case, any two indication information among the first indication information, second indication information and third indication information can be carried in the same message; or, access The network device may also send the first indication information, the second indication information and the third indication information to the terminal device through one message.
  • the third indication information will be described below respectively with respect to the first association relationship and the second association relationship.
  • the association between the first port index group and the second port index group is the first association.
  • association relationship between the first port index group and the second port index group is the first association relationship
  • the third indication information may indicate whether to allocate the port index group in the second set to other terminal devices on the time-frequency resources allocated to the terminal device. ; Or, when the first indication information indicates the second port index group, the third indication information may indicate whether to allocate the port index group in the first set to other terminal devices on the time-frequency resources allocated to the terminal device.
  • the access network device assigns the port index group in the second set to other terminal devices.
  • One port index group is assigned to another terminal device, or the access network device assigns multiple port index groups in the second set to multiple other terminal devices respectively. That is to say, the access network device can send the third indication information to the terminal device as long as it allocates any port index group in the second set to other terminal devices.
  • the third indication information indicates whether to allocate the port index group in the second set to other terminal devices on the time-frequency resources allocated to the terminal device
  • the third indication information can be replaced with other possible descriptions. For example, it can be replaced by "The third indication information indicates whether to allocate the port index group in the second set to other terminal devices in the same transmission or scheduling.” Or, for example, it can be replaced by "The third indication information indicates whether the port index group in the second set is allocated to other terminal devices.”
  • the length of the frequency domain mask sequence corresponding to the DMRS port allocated by the device is 2 or 4". Other similar descriptions can be referred to.
  • the third indication information when the first indication information indicates the first port index group, the third indication information may indicate whether to allocate the second port index group to other terminal devices on the time-frequency resources allocated to the terminal device; or, When the first indication information indicates the second port index group, the third indication information may indicate whether to allocate the first port index group to other terminal devices on the time-frequency resources allocated to the terminal device.
  • the access network device may send the third port index group to the terminal device.
  • third indication information when other port index groups in the second set except the second port index group are allocated to other terminal devices, the third indication information may not be sent to the terminal device.
  • the access network device may send third indication information to the terminal device. instructions information instructions The port index group in the second set is not assigned to other terminal devices.
  • the access network device may perform operation 1 and/or operation 2.
  • the access network device performing operation 1 may mean that the access network device sends third indication information to the terminal device, and the third indication information indicates that the port index group in the second set is allocated to other terminal devices.
  • the access network device performing operation 2 may refer to: the access network device uses zero-forcing precoding to eliminate interference between the paired terminal devices based on the channel information of the paired terminal devices (such as the terminal device and other terminal devices).
  • the access network equipment is multiple terminal devices
  • the allocated DMRS ports for example, multiple terminal devices include two terminal devices, the access network device allocates an existing DMRS port to one of the terminal devices, and a new DMRS port to the other terminal device) are different at the same time.
  • a terminal device can be called a group of paired terminal devices.
  • the terminal device can determine the port index allocated by the access network device to the terminal device in the above manner. For example, the access network device allocates the first port index group in the first set to the terminal device.
  • the first set is the set mentioned above. 3.
  • the port index included in the first port index group is DMRS port index “0”.
  • the third indication information indicates that the port index group in the second set is not allocated to other terminal devices, there will be no interference from the new DMRS port to the existing DMRS port. Therefore, even if the outer mask is not considered, the access
  • the DMRS ports allocated by network equipment to terminal equipment are also orthogonal. Furthermore, when the terminal equipment performs channel estimation based on the DMRS corresponding to DMRS port 0, it does not need to consider the influence of the outer mask; or in other words, when the terminal equipment performs channel estimation based on the DMRS corresponding to DMRS port 0, it can perform channel estimation based on the frequency domain mask. Channel estimation is performed with a code length of 2; in other words, when the terminal device performs channel estimation based on the DMRS corresponding to DMRS port 0, it only needs to consider the despreading of the inner mask.
  • the third indication information indicates that the DMRS port index group in the second set is allocated to other terminal devices, when only the inner mask is considered, interference from the new DMRS port to the existing DMRS port will occur, and the terminal
  • the device performs channel estimation based on the DMRS corresponding to DMRS port 0, it needs to consider the impact of the outer mask to reduce the interference of the new DMRS port to the existing DMRS port;
  • channel estimation needs to be carried out according to the frequency domain mask length of 4; in other words, when the terminal device performs channel estimation based on the DMRS corresponding to DMRS port 0, it needs to consider the inner mask and the outer mask. of de-expansion.
  • the above description of the slave access network device and the terminal device is only a possible example, and this example can be referred to in other situations of the embodiments of the present application.
  • the port index group in the second set is not assigned to other terminal devices can be replaced by "the second port index group is not assigned to other terminal devices”
  • the port index group in the second set is allocated to other terminal devices may be replaced by "the second port index group is allocated to other terminal devices”.
  • the third indication information may indicate the time allocated for the terminal device. On the frequency resource, yes Whether to allocate the port index group in the second set to other terminal devices; or, when the first indication information indicates the second port index group, the third indication information may indicate whether to allocate the time-frequency resources allocated to the terminal device. Port index groups in the first set are assigned to other terminal devices.
  • the access network device can send the third port index group to the terminal device.
  • Three instructions that is to say, as long as the access network device allocates any port index group in the second set to other terminal devices, it can send the third port index group to the terminal device.
  • the access network device can send the third indication information to the terminal device. , to indicate whether to allocate the port index group in the second set to other terminal devices.
  • the first indication information indicates the first port index group
  • the DMRS port in the first port index group The indexes are all existing DMRS port indexes (for example, the first port index group is one of the port index groups shown in Table 3A to Table 6B).
  • the access network device can send the third indication information to the terminal device. , to indicate whether to allocate the port index group in the second set to other terminal devices. For specific implementation, please refer to the above description.
  • the access network device allocates a second port index group to the terminal device, since the DMRS port index in the second port index group includes the existing DMRS port index and the new DMRS port index (for example, the second port index group is Table 14A and a certain port index group shown in Table 14B).
  • the terminal device can determine based on the assigned DMRS port index that the influence of the outer mask needs to be considered when performing channel estimation in order to reduce the number of new Interference between the DMRS port and the existing DMRS port; therefore, the access network device does not need to send the third indication information to the terminal device, thereby saving signaling overhead.
  • S603 is an optional step, that is to say, the access network device may not send the third indication information to the terminal device.
  • the terminal device may perform channel estimation according to a granularity of frequency domain mask length of 4 by default.
  • the terminal device can perform channel estimation in a corresponding manner according to the third indication information. For example, according to the third instruction information, the terminal device can not consider the despreading of the outer mask when estimating the channel, thereby making the implementation of channel estimation simpler; for another example, according to the third instruction information, the terminal device can perform channel estimation during channel estimation.
  • the despreading of the inner mask and the outer mask is taken into consideration to reduce the interference between the existing DMRS port and the new DMRS port.
  • the access network equipment and the terminal equipment may include corresponding hardware structures and/or software modules that perform each function.
  • the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving the hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.
  • each functional unit can be divided corresponding to each function, or two or more functions can be integrated into one unit.
  • the above integrated units can be implemented in the form of hardware or software functional units.
  • Figure 7 shows a possible exemplary block diagram of the device involved in the embodiment of the present application.
  • the device 700 may include: a processing unit 702 and a communication unit 703.
  • the processing unit 702 is used to control and manage the actions of the device 700 .
  • the communication unit 703 is used to support communication between the device 700 and other devices.
  • the communication unit 703 is also called a transceiver unit and may include a receiving unit and/or a sending unit, respectively configured to perform receiving and sending operations.
  • the device 700 may also include a storage unit 701 for storing the program code of the device 700 and/or data.
  • the device 700 may be the access network equipment in the above embodiment.
  • the processing unit 702 can support the apparatus 700 to perform the actions of the access network device in each of the above method examples.
  • the processing unit 702 mainly performs internal actions of the access network device in the method example, and the communication unit 703 may support communication between the apparatus 700 and other devices.
  • the communication unit 703 is configured to: send first indication information to a terminal device, and send second indication information to the terminal device; when the second indication information indicates a first value, the The first indication information indicates a first port index group among multiple port index groups included in the first set; when the second indication information indicates a second value, the first indication information indicates a port index group included in the second set.
  • a second port index group among multiple port index groups; the first port index group and the second port index group have an associated relationship.
  • the device 700 may be the terminal device in the above embodiment.
  • the processing unit 702 can support the apparatus 700 to perform the actions of the terminal device in each of the above method examples.
  • the processing unit 702 mainly performs internal actions of the terminal device in the method example, and the communication unit 703 may support communication between the apparatus 700 and other devices.
  • the communication unit 703 is configured to: receive first indication information from the access network device, and receive second indication information from the access network device; when the second indication information indicates the third When there is a value, the first indication information indicates the first port index group among the plurality of port index groups included in the first set; when the second indication information indicates a second value, the first indication information indicates A second port index group among the plurality of port index groups included in the second set; the first port index group and the second port index group have an associated relationship.
  • each unit in the device can be a separate processing element, or it can be integrated and implemented in a certain chip of the device.
  • it can also be stored in the memory in the form of a program, and a certain processing element of the device can call and execute the unit. Function.
  • all or part of these units can be integrated together or implemented independently.
  • the processing element described here can also be a processor, which can be an integrated circuit with signal processing capabilities.
  • each operation of the above method or each unit above can be implemented by an integrated logic circuit of hardware in the processor element or implemented in the form of software calling through the processing element.
  • the unit in any of the above devices may be one or more integrated circuits configured to implement the above method, such as: one or more application specific integrated circuits (ASIC), or one or Multiple microprocessors (digital signal processors, DSPs), or one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms.
  • ASIC application specific integrated circuits
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • the unit in the device can be implemented in the form of a processing element scheduler
  • the processing element can be a processor, such as a general central processing unit (CPU), or other processors that can call programs.
  • these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).
  • SOC system-on-a-chip
  • the above receiving unit is an interface circuit of the device and is used to receive signals from other devices.
  • the receiving unit is an interface circuit used by the chip to receive signals from other chips or devices.
  • the above unit used for sending is an interface circuit of the device and is used to send signals to other devices.
  • the sending unit is an interface circuit used by the chip to send signals to other chips or devices.
  • the access network device 80 may include one or more DUs 801 and one or more CUs 802.
  • the DU 801 may include at least one antenna 8011, at least one radio frequency unit 8012, at least one processor 8013 and at least one memory 8014.
  • the DU 801 part is mainly used for transmitting and receiving radio frequency signals, converting radio frequency signals and baseband signals, and performing partial baseband processing.
  • CU 802 may include at least one processor 8022 and at least one memory 8021.
  • the CU 802 part is mainly used for baseband processing, control of access network equipment, etc.
  • the DU 801 and the CU 802 can be physically set together or physically separated, that is, a distributed base station.
  • the CU 802 is the control center of the access network equipment, which can also be called a processing unit, and is mainly used to complete the baseband processing function.
  • the CU 802 can be used to control the access network device to perform the operation process of the access network device in the above method embodiment.
  • the access network device 80 may include one or more radio frequency units, one or more DUs and one or more CUs.
  • the DU may include at least one processor 8013 and at least one memory 8014
  • the radio frequency unit may include at least one antenna 8011 and at least one radio frequency unit 8012
  • the CU may include at least one processor 8022 and at least one memory 8021.
  • the CU802 can be composed of one or more single boards. Multiple single boards can jointly support a wireless access network (such as a 5G network) with a single access indication, or can also support wireless access networks of different access standards. Access network (such as LTE network, 5G network or other networks).
  • the memory 8021 and processor 8022 may serve one or more single boards. In other words, the memory and processor can be set independently on each board. It is also possible for multiple boards to share the same memory and processor. In addition, necessary circuits can also be installed on each board.
  • the DU801 can be composed of one or more single boards.
  • Multiple single boards can jointly support a wireless access network with a single access indication (such as a 5G network), or can respectively support wireless access networks of different access standards (such as a 5G network).
  • a single access indication such as a 5G network
  • the memory 8014 and processor 8013 may serve one or more single boards. In other words, the memory and processor can be set independently on each board. It is also possible for multiple boards to share the same memory and processor. In addition, necessary circuits can also be installed on each board.
  • the access network device shown in Figure 8 can implement various processes involving the access network device in the above method embodiment.
  • the operations and/or functions of each module in the access network equipment shown in Figure 8 are respectively intended to implement the corresponding processes in the above method embodiment.
  • the terminal device can be applied in the communication system shown in FIG. 1 to implement the operations of the terminal device in the above embodiment.
  • the terminal device includes: an antenna 910, a radio frequency part 920, and a signal processing part 930.
  • the antenna 910 is connected to the radio frequency part 920.
  • the radio frequency part 920 receives the information sent by the network device (such as the access network device) through the antenna 910, and sends the information sent by the network device to the signal processing part 930 for processing.
  • the signal processing part 930 processes the information of the terminal device and sends it to the radio frequency part 920.
  • the radio frequency part 920 processes the information of the terminal device and sends it to the network device through the antenna 910.
  • the signal processing part 930 may include a modulation and demodulation subsystem for processing each communication protocol layer of the data; it may also include a central processing subsystem for processing the operating system and application layer of the terminal device; in addition, it may also include It includes other subsystems, such as multimedia subsystem, peripheral subsystem, etc.
  • the multimedia subsystem is used to control the camera, screen display, etc. of the terminal device, and the peripheral subsystem is used to realize the connection with other devices.
  • the modem subsystem can be a separately configured chip.
  • the modem subsystem may include one or more processing elements 931, including, for example, a host CPU and other integrated circuits.
  • the modem subsystem may also include a storage element 932 and an interface circuit 933.
  • storage element 932 is used to store data and programs, but the program used to perform the method performed by the terminal device in the above method may not be stored in the storage element 932, but stored in a memory outside the modem subsystem.
  • the modem subsystem is loaded for use.
  • Interface circuit 933 is used to communicate with other subsystems.
  • the modulation and demodulation subsystem can be implemented by a chip, which includes at least one processing element and an interface circuit, wherein the processing element is used to perform various steps of any method performed by the above terminal equipment, and the interface circuit is used to communicate with other devices.
  • the unit for the terminal device to implement each step in the above method can be implemented in the form of a processing element scheduler.
  • the device for the terminal device includes a processing element and a storage element, and the processing element calls a program stored in the storage element to Execute the method executed by the terminal device in the above method embodiment.
  • the storage element may be a storage element on the same chip as the processing element, that is, an on-chip storage element.
  • the program for executing the method performed by the terminal device in the above method may be in a storage element on a different chip from the processing element, that is, an off-chip storage element.
  • the processing element calls from the off-chip storage element or loads the program on the on-chip storage element to call and execute the method executed by the terminal device in the above method embodiment.
  • the unit of the terminal device that implements each step in the above method may be configured as one or more processing elements. These processing elements are provided on the modulation and demodulation subsystem.
  • the processing elements here may be integrated circuits. For example: one or more ASICs, or one or more DSPs, or one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits can be integrated together to form a chip.
  • the units of the terminal device that implement each step in the above method can be integrated together and implemented in the form of a SOC.
  • the SOC chip is used to implement the above method.
  • the chip can integrate at least one processing element and a storage element, and the processing element calls the stored program of the storage element to implement the above method executed by the terminal device; or, the chip can integrate at least one integrated circuit to implement the above terminal device.
  • the method of device execution; or, the above implementation methods can be combined, and the functions of some units are realized in the form of processing components calling programs, and the functions of some units are realized in the form of integrated circuits.
  • the above apparatus for a terminal device may include at least one processing element and an interface circuit, wherein at least one processing element is used to execute any method performed by the terminal device provided in the above method embodiments.
  • the processing element can execute part or all of the steps executed by the terminal device in the first way: that is, by calling the program stored in the storage element; or it can also use the second way: that is, by combining the instructions with the integrated logic circuit of the hardware in the processor element. method to perform part or all of the steps performed by the terminal device; of course, the first method and the second method may also be combined to perform part or all of the steps performed by the terminal device.
  • the processing elements here are the same as described above and can be implemented by a processor.
  • the functions of the processing elements can be the same as the functions of the processing unit described in FIG. 7 .
  • the processing element may be a general-purpose processor, such as a CPU, or one or more integrated circuits configured to implement the above method, such as: one or more ASICs, or one or more microprocessors DSP , or, one or more FPGAs, etc., or a combination of at least two of these integrated circuit forms.
  • the storage element can be implemented by a memory, and the function of the storage element can be the same as the function of the storage unit described in FIG. 7 .
  • the storage element can be one memory or a collective name for multiple memories.
  • the terminal device shown in Figure 9 can implement various processes related to the terminal device in the above method embodiment.
  • the operations and/or functions of each module in the terminal device shown in Figure 9 are respectively to implement the corresponding processes in the above method embodiment.
  • system and “network” in the embodiments of this application may be used interchangeably.
  • “At least one” means one or more, and “plurality” means two or more.
  • “And/or” describes the relationship between associated objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. situation, where A and B can be singular or plural.
  • the character “/” generally indicates that the related objects are in an “or” relationship.
  • “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, and C includes A, B, C, AB, AC, BC, or ABC.
  • the ordinal numbers such as “first” and “second” mentioned in the embodiments of this application are used to distinguish multiple objects and are not used to limit the order, timing, priority or importance of multiple objects. degree.
  • embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, etc.) having computer-usable program code embodied therein.
  • a computer-usable storage media including, but not limited to, disk storage, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions
  • the device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.
  • These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device.
  • Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

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Abstract

本申请涉及通信技术领域，公开了一种通信方法及装置。其中方法包括：接入网设备向终端设备发送第一指示信息，以及向终端设备发送第二指示信息；当第二指示信息指示第一值时，第一指示信息指示第一集合所包括的多个端口索引组中的第一端口索引组；当第二指示信息指示第二值时，第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；第一端口索引组和第二端口索引组具有关联关系。采用上述方法，通过建立第一端口索引组和第二端口索引组之间的关联关系，针对于第二指示信息所指示的不同值，对第一指示信息所指示的端口索引组可以有不同的解读，从而在扩充端口后，能够实现在指示为终端设备分配的端口的同时，有效降低指示开销。

Description

一种通信方法及装置
相关申请的交叉引用
本申请要求在2022年04月24日提交中国专利局、申请号为202210435803.4、申请名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
解调参考信号(demodulation reference signal，DMRS)可用于估计数据信道或控制信道的等效信道。其中，数据信道比如可以为物理上行共享信道(physical uplink shared channel，PUSCH)或物理下行共享信道(physical downlink shared channel，PDSCH)，控制信道比如可以为物理下行控制信道(physical downlink control channel，PDCCH)。
以下行数据传输为例，接入网设备通过PDSCH向终端设备发送数据时，可以根据下行信道状态信息(channel state information，CSI)对数据进行预编码处理；进一步地，接入网设备还可以为终端设备分配DMRS端口，并在DMRS端口对应的时频资源上通过PDSCH向终端设备发送DMRS，DMRS通常与数据进行相同的信号处理，如预编码等。如此，终端设备接收到DMRS端口对应的DMRS后，可以利用信道估计算法获得对等效信道的估计，进而可以基于等效信道完成数据的解调。
然而，在扩充DMRS端口后，接入网设备如何向终端设备指示为终端设备分配的DMRS端口，仍需进一步研究。
发明内容
本申请提供了一种通信方法及装置，用于实现在扩充端口后，向终端设备指示为终端设备分配的端口。
第一方面，本申请实施例提供一种通信方法，该方法可以应用于接入网设备或者接入网设备中的模块(如芯片)，以该方法应用于接入网设备为例，在该方法中，接入网设备可以向终端设备发送第一指示信息，以及向所述终端设备发送第二指示信息；当所述第二指示信息指示第一值时，所述第一指示信息指示第一集合所包括的多个端口索引组中的第一端口索引组；当所述第二指示信息指示第二值时，所述第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；所述第一端口索引组和所述第二端口索引组具有关联关系。
采用上述方案，通过建立第一端口索引组和第二端口索引组之间的关联关系，针对于第二指示信息所指示的不同值，对第一指示信息所指示的DMRS端口索引组有不同的解读，从而在扩充端口后，能够实现在指示为终端设备分配的端口的同时，有效降低指示开销。
在一种可能的设计中，所述关联关系为：所述第一端口索引组中的端口索引和所述第二端口索引组中的端口索引一一对应。
比如，第一集合所包括的多个端口索引组中的端口索引均为现有DMRS端口索引，第二集合所包括的多个端口索引组中的端口索引均为新增DMRS端口索引。当第二指示信息指示第一值时，第一指示信息所指示的第一端口索引组中包括现有DMRS端口索引，当第二指示信息指示第二值时，第一指示信息所指示的第二端口索引组中包括新增DMRS端口索引，从而使得接入网设备可以不同时为终端设备分配现有DMRS端口和新增DMRS端口，便于更好地保证信道估计的性能。
在一种可能的设计中，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
在一种可能的设计中，所述第一集合对应多个端口索引，对于所述第一集合所包括的多个端口索引组中的每个端口索引组，所述每个端口索引组包括所述多个端口索引中的至少一个端口索引；所述偏移量等于所述第一集合对应的端口索引的个数。
其中，第一集合对应的端口索引的个数可以不同于第一集合所包括的端口索引组的个数。比如，第一集合对应的端口索引包括DMRS端口索引“0～3”(即第一集合对应的端口索引的个数为4)，此种情形下，第一集合可以包括12个端口索引组，具体可以参照表3A所示。
在一种可能的设计中，所述偏移量的取值为4，8，6或12。
在一种可能的设计中，所述关联关系为：所述第一端口索引组为所述第二端口索引组的子集。
在一种可能的设计中，所述第二端口索引组包括所述第一端口索引组中的端口索引，还包括所述第一端口索引组中的端口索引对应的端口索引；所述第一端口索引组包括第一端口索引，所述第一端口索引对应的端口索引与所述第一端口索引之间具有偏移量。
在一种可能的设计中，所述第二指示信息承载于无线资源控制RRC消息或下行控制信息DCI。
在一种可能的设计中，所述第一指示信息指示第一索引值；所述第一索引值关联所述第一端口索引组和所述第二端口索引组。
在一种可能的设计中，所述第一端口索引组和所述第二端口索引组对应的时频资源相同；所述第一端口索引组对应第一掩码序列，所述第二端口索引组对应第二掩码序列，所述第一掩码序列和所述第二掩码序列正交。
在一种可能的设计中，所述方法还包括：向所述终端设备发送第三指示信息；当所述第一指示信息指示所述第一端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第二端口索引组分配给其它终端设备；或者，当所述第一指示信息指示所述第二端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第一端口索引组分配给其它终端设备。
基于上述方案，由于接入网设备可以向终端设备发送第三指示信息，从而使得终端设备可以根据第三指示信息，采用相应的方式进行信道估计。比如，当第三指示信息指示在为终端设备分配的时频资源上，未将第二端口索引组(或第一端口索引组)分配给其它终端设备时，终端设备根据第三指示信息，可以在信道估计时不考虑外层掩码的解扩，从而使得信道估计的实现更为简便；又比如，当第三指示信息指示在为终端设备分配的时频资源上，将第二端口索引组(或第一端口索引组)分配给了其它终端设备时，终端设备根据第三指示信息，可以在信道估计时考虑内层掩码和外层掩码的解扩，从而便于降低现有 DMRS端口和新增DMRS端口之间的干扰。
第二方面，本申请实施例提供一种通信方法，该方法可以应用于终端设备或者终端设备中的模块(如芯片)，以该方法应用于终端设备为例，在该方法中，终端设备可以接收来自接入网设备的第一指示信息，以及接收来自所述接入网设备的第二指示信息；当所述第二指示信息指示第一值时，所述第一指示信息指示第一集合所包括的多个端口索引组中的第一端口索引组；当所述第二指示信息指示第二值时，所述第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；所述第一端口索引组和所述第二端口索引组具有关联关系。
在一种可能的设计中，所述关联关系为：所述第一端口索引组中的端口索引和所述第二端口索引组中的端口索引一一对应。
在一种可能的设计中，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
在一种可能的设计中，所述第一集合对应多个端口索引，对于所述第一集合所包括的多个端口索引组中的每个端口索引组，所述每个端口索引组包括所述多个端口索引中的至少一个端口索引；所述偏移量等于所述第一集合对应的端口索引的个数。
在一种可能的设计中，所述偏移量的取值为4，8，6或12。
在一种可能的设计中，所述关联关系为：所述第一端口索引组为所述第二端口索引组的子集。
在一种可能的设计中，所述第二端口索引组包括所述第一端口索引组中的端口索引，还包括所述第一端口索引组中的端口索引对应的端口索引；
所述第一端口索引组包括第一端口索引，所述第一端口索引对应的端口索引与所述第一端口索引之间具有偏移量。
在一种可能的设计中，所述第二指示信息承载于RRC消息或DCI。
在一种可能的设计中，所述第一指示信息指示第一索引值；所述第一索引值关联所述第一端口索引组和所述第二端口索引组。
在一种可能的设计中，所述第一端口索引组和所述第二端口索引组对应的时频资源相同；所述第一端口索引组对应第一掩码序列，所述第二端口索引组对应第二掩码序列，所述第一掩码序列和所述第二掩码序列正交。
在一种可能的设计中，所述方法还包括：接收来自所述接入网设备的第三指示信息；当所述第一指示信息指示所述第一端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第二端口索引组分配给其它终端设备；或者，当所述第一指示信息指示所述第二端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第一端口索引组分配给其它终端设备。
可以理解的是，第二方面中的方法与第一方面中的方法相对应，相关技术特征的有益效果可以参照第一方面中的描述，不再赘述。
第三方面，本申请提供一种通信装置，所述通信装置具备实现上述第一方面的功能，比如，所述通信装置包括执行上述第一方面涉及操作所对应的模块或单元或手段(means)，所述模块或单元或手段可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现。
在一种可能的设计中，所述通信装置包括处理单元、通信单元，其中，通信单元可以 用于收发信号，以实现该通信装置和其它装置之间的通信；处理单元可以用于执行该通信装置的一些内部操作。处理单元、通信单元执行的功能可以和上述第一方面涉及的操作相对应。
在一种可能的设计中，所述通信装置包括处理器，处理器可以用于与存储器耦合。所述存储器可以保存实现上述第一方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第一方面中任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和存储器，存储器可以保存实现上述第一方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第一方面中任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和接口电路，其中，处理器用于通过所述接口电路与其它装置通信，并执行上述第一方面中任意可能的设计或实现方式中的方法。
第四方面，本申请提供一种通信装置，所述通信装置具备实现上述第二方面涉及的功能，比如，所述通信装置包括执行上述第二方面涉及操作所对应的模块或单元或手段，所述功能或单元或手段可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现。
在一种可能的设计中，所述通信装置包括处理单元、通信单元，其中，通信单元可以用于收发信号，以实现该通信装置和其它装置之间的通信，比如，通信单元用于向终端设备发送系统信息；处理单元可以用于执行该通信装置的一些内部操作。处理单元、通信单元执行的功能可以和上述第二方面涉及的操作相对应。
在一种可能的设计中，所述通信装置包括处理器，处理器可以用于与存储器耦合。所述存储器可以保存实现上述第二方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第二方面任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和存储器，存储器可以保存实现上述第二方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第二方面任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和接口电路，其中，处理器用于通过所述接口电路与其它装置通信，并执行上述第二方面任意可能的设计或实现方式中的方法。
可以理解地，上述第三方面和第四方面中，处理器可以通过硬件来实现也可以通过软件来实现，当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现。此外，以上处理器可以为一个或多个，存储器可以为一个或多个。存储器可以与处理器集成在一起，或者存储器与处理器分离设置。在具体实现过程中，存储器可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请实施例对存储器的类型以及存储器与处理器的设置方式不做限定。
第五方面，本申请提供一种通信系统，该通信系统可以包括上述第三方面所提供的通 信装置和上述第四方面所提供的通信装置。
第六方面，本申请提供一种计算机可读存储介质，所述计算机存储介质中存储有计算机可读指令，当计算机读取并执行所述计算机可读指令时，使得计算机执行上述第一方面或第二方面的任一种可能的设计中的方法。
第七方面，本申请提供一种计算机程序产品，当计算机读取并执行所述计算机程序产品时，使得计算机执行上述第一方面或第二方面的任一种可能的设计中的方法。
第八方面，本申请提供一种芯片，所述芯片包括处理器，所述处理器与存储器耦合，用于读取并执行所述存储器中存储的软件程序，以实现上述第一方面或第二方面的任一种可能的设计中的方法。
附图说明
图1为本申请实施例适用的一种网络架构示意图；
图2为本申请实施例提供的DMRS资源映射示意图；
图3为本申请实施例提供的DMRS端口指示方法所对应的流程示意图；
图4为本申请实施例提供的扩充DMRS端口的一种示意图；
图5为本申请实施例提供的扩充DMRS端口的又一种示意图；
图6为本申请实施例提供的通信方法所对应的流程示意图；
图7为本申请实施例中所涉及的装置的可能的示例性框图；
图8为本申请实施例提供的一种接入网设备的结构示意图；
图9为本申请实施例提供的一种终端设备的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
图1为本申请实施例应用的通信系统的架构示意图。如图1所示，通信系统1000包括无线接入网100和核心网200，可选的，通信系统1000还可以包括互联网300。其中，无线接入网100可以包括至少一个无线接入网设备，如图1中的110a和110b，还可以包括至少一个终端设备，如图1中的120a-120j。其中，110a是基站，110b是微站，120a、120e、120f和120j是手机，120b是汽车，120c是加油机，120d是布置在室内或室外的家庭接入节点(home access point，HAP)，120g是笔记本电脑，120h是打印机，120i是无人机。
图1中，终端设备可以与无线接入网设备相连，无线接入网设备可以与核心网中的核心网设备连接。核心网设备与无线接入网设备可以是独立的不同的物理设备，也可以是将核心网设备的功能与无线接入网设备的逻辑功能集成在同一个物理设备上，还可以是一个物理设备上集成了部分核心网设备的功能和部分的无线接入网设备的功能。终端设备和终端设备之间以及无线接入网设备和无线接入网设备之间可以通过有线或无线的方式相互连接。图1只是示意图，该通信系统中还可以包括其它设备，如还可以包括无线中继设备和无线回传设备，在图1中未画出。
下面对无线接入网设备和终端设备进行介绍。
(1)无线接入网设备
无线接入网设备也可以称为接入网设备，接入网设备可以是基站、演进型基站(evolved  NodeB，eNodeB)、发送接收点(transmission reception point，TRP)、第五代(5th generation，5G)移动通信系统中的下一代基站(next generation NodeB，gNB)、第六代(6th generation，6G)移动通信系统中的基站、未来移动通信系统中的基站或无线保真(wireless fidelity，WiFi)系统中的接入节点等；也可以是完成基站部分功能的模块或单元，例如，可以是集中式单元(central unit，CU)，也可以是分布式单元(distributed unit，DU)。接入网设备可以是宏基站(如图1中的110a)，也可以是微基站或室内站(如图1中的110b)，还可以是中继节点或施主节点等。本申请实施例对接入网设备所采用的具体技术和具体设备形态不做限定。
本申请实施例中，用于实现接入设备的功能的装置可以是接入网设备；也可以是能够支持接入网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接入网设备中。其中，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。在本申请实施例提供的技术方案中，以用于实现接入网设备的功能的装置是接入网设备为例，描述本申请实施例提供的技术方案。
(2)终端设备
终端设备也可以称为终端、用户设备(user equipment，UE)、移动台、移动终端等。终端设备可以广泛应用于各种场景，例如，设备到设备(device-to-device，D2D)、车物(vehicle to everything，V2X)通信、机器类通信(machine-type communication，MTC)、物联网(internet of things，IOT)、虚拟现实、增强现实、工业控制、自动驾驶、远程医疗、智能电网、智能家具、智能办公、智能穿戴、智能交通、智慧城市等。终端设备可以是手机、平板电脑、带无线收发功能的电脑、可穿戴设备、车辆、无人机、直升机、飞机、轮船、机器人、机械臂、智能家居设备等。本申请实施例对终端设备所采用的具体技术和具体设备形态不做限定。
本申请实施例中，用于实现终端设备的功能的装置可以是终端设备；也可以是能够支持终端设备实现该功能的装置，例如芯片系统，该装置可以被安装在终端设备中。本申请实施例提供的技术方案中，以用于实现终端设备的功能的装置是终端设备为例，描述本申请实施例提供的技术方案。
此外，同一个终端设备或接入网设备，在不同应用场景中可以提供不同的功能。比如，图1中的手机包括120a、120e、120f和120j。其中，手机120a可以接入基站110a，连接汽车120b，与手机120e直连通信以及接入到HAP；手机120e可以接入HAP以及与手机120a直连通信；手机120f可以接入为微站110b，连接笔记本电脑120g，连接打印机120h；手机120j可以控制无人机120i。
接入网设备和终端设备的角色可以是相对的。例如，图1中的直升机或无人机120i可以被配置成移动基站，对于那些通过120i接入到无线接入网100的终端设备120j来说，终端设备120i是基站；但对于基站110a来说，120i是终端设备，即110a与120i之间是通过无线空口协议进行通信的。当然，110a与120i之间也可以是通过基站与基站之间的接口协议进行通信的，此时，相对于110a来说，120i也是基站。因此，无线接入网和终端设备都可以统一称为通信装置，图1中的110a和110b可以称为具有基站功能的通信装置，图1中的120a-120j可以称为具有终端设备功能的通信装置。
接入网设备和终端设备可以是固定位置的，也可以是可移动的。接入网设备和终端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署 在空中的飞机、气球和人造卫星上。本申请的实施例对接入网设备和终端设备的应用场景不做限定。
接入网设备和终端设备之间、接入网设备和接入网设备之间、终端设备和终端设备之间可以通过授权频谱进行通信，也可以通过免授权频谱进行通信，也可以同时通过授权频谱和免授权频谱进行通信；可以通过6千兆赫兹(gigahertz，GHz)以下的频谱进行通信，也可以通过6GHz以上的频谱进行通信，还可以同时使用6GHz以下的频谱和6GHz以上的频谱进行通信。本申请的实施例对无线通信所使用的频谱资源不做限定。
上述图1所示意的通信系统可以支持各种无线接入技术(radio access technology，RAT)，例如图1所示意的通信系统可以为第四代(4th generation，4G)通信系统(也可以称为长期演进(long term evolution，LTE)通信系统)，5G通信系统(也可以称为新无线(new radio，NR)通信系统)，或者是面向未来的演进系统。本申请实施例描述的通信系统以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着通信系统的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
下面先对本申请实施例所涉及的相关技术特征进行解释说明。需要说明的是，这些解释是为了让本申请实施例更容易被理解，而不应该视为对本申请所要求的保护范围的限定。
一、DMRS
在图1所示意的通信系统中，接入网设备可以通过控制信道(比如PDCCH)向终端设备发送控制信息，从而为终端设备分配数据信道的传输参数，数据信道比如可以为PDSCH或PUSCH。示例性地，控制信息可以指示数据信道所映射的时域符号和/或频域资源块(resource block，RB)，进而接入网设备和终端设备在该分配的时频资源上，可以通过数据信道传输下行数据(比如PDSCH携带的数据)和/或上行数据(比如PUSCH携带的数据)。其中，本申请实施例中的时域符号可以是正交频分复用(orthogonal frequency division multiplexing，OFDM)符号，或者也可以是离散傅里叶变换扩频OFDM(discrete fourier transform-spread-OFDM，DFT-s-OFDM)符号。
进一步地，控制信道(比如PDCCH)或数据信道(比如PDSCH或PUSCH)中还可以携带参考信号，比如解调参考信号(demodulation reference signal，DMRS)。以数据信道为例，DMRS可用于估计数据信道所承载的数据信号的等效信道，从而用于数据信道中数据的检测和解调。DMRS通常与数据进行相同的信号处理，如预编码等，从而保证DMRS与数据经历相同的等效信道。
假设发送端发送的DMRS向量为s，发送的数据信号(或称数据符号)向量为x，DMRS与数据进行相同的预编码(比如乘以相同的预编码矩阵P)，预编码后的数据信号和DMRS同时传输并经历相同的信道。接收端相应的接收信号向量可以表示为：
数据：
DMRS：
其中，y表示接收端接收到的数据信号向量，r表示接收端接收到的DMRS向量，H表示数据信号和DMRS实际经历的信道，P表示预编码矩阵，n表示噪声信号向量。
由于数据和DMRS经历的等效信道均为因此，接收端可基于已知的DMRS向量s，利用信道估计算法获得对等效信道的估计，其中DMRS向量是由多个DMRS端口对应的DMRS符号构成；进而，接收端可基于等效信道可以完成数据的检测和解调。其中，信道估计算法比如可以为最小二乘(least square，LS)信道估计算法、最小均方误差(minimum mean square error，MMSE)信道估计算法或者是基于离散傅里叶变换(discrete fourier transform，DFT)/逆离散傅里叶变换(inverse DFT，IDFT)的时延域信道估计算法。
二、DMRS端口
端口可以是指天线端口(antenna port)，端口可以理解为被接收端所识别的发射天线，或者在空间上可以区分的发射天线。针对每个虚拟天线可以配置一个端口，每个虚拟天线可以为多个物理天线的加权组合。用于发送参考信号的端口可以称为参考信号端口，参考信号比如可以为DMRS、信道状态信息参考信号(channel state information reference signal，CSI-RS)或探测参考信号(sounding reference signal，SRS)，具体不做限定。
以DMRS端口为例，不同DMRS端口可以通过不同索引(或者说端口号)进行区分。比如，针对于一个DMRS端口，该DMRS端口的索引可以为1000+X，X的取值可以为大于或等于0的整数。1000+X也可以记为X，当DMRS端口的索引可以为1000+X时，该DMRS端口可以称为DMRS端口1000+X，或者也可以称为DMRS端口X。也就是说，本申请实施例中，1000+X和X可以理解为同一DMRS端口的索引。
下文中将以端口为DMRS端口为例进行描述，可以理解的是，本申请实施例提供的方法除适用于DMRS端口外，也可以适用于其它可能的参考信号端口，比如CSI-RS端口、SRS端口。
三、DMRS端口的时频资源映射
对于一个DMRS端口来说，该DMRS端口可以与一个或多个DMRS信号符号(也可称为DMRS调制符号，或简称为DMRS符号)对应。为了对不同的时频资源进行信道估计，可以在多个时频资源内发送该DMRS端口对应的多个DMRS符号。以及，为了保证信道估计的质量，通常不同DMRS端口为正交端口，以避免不同DMRS端口之间的干扰。
一个DMRS端口对应的多个DMRS符号可以对应一个DMRS序列，一个DMRS序列包括多个DMRS序列元素。一个DMRS端口对应的DMRS序列可通过时频资源映射规则，与对应的掩码序列相乘后映射到对应的时频资源上。比如，对于DMRS端口p，其对应的DMRS序列中的第m个DMRS序列元素r(m)，可按照时频资源映射规则映射至索引为(k,l)p,μ的资源元素(resource element，RE)上。其中，索引为(k,l)p,μ的RE可在时域上对应一个时隙内的索引为l的时域符号，在频域上对应索引为k的子载波。其中，时频资源映射规则可以满足如下公式1：


k′＝0,1；

n＝0,1,...；
l′＝0,1；
其中，p为DMRS端口的索引，μ为子载波间隔参数，为映射至索引为(k,l)p,μ的RE上的DMRS端口p对应的DMRS符号，为功率缩放因子或功率控制因子，wt(l′)为索引为l′的时域符号对应的时域掩码序列元素，wf(k′)为索引为k′的子载波对应的频域掩码序列元素，m＝2n+k′，Δ为子载波偏移因子，为DMRS符号占用的起始时域符号的符号索引或参考时域符号的符号索引。
进一步地，DMRS端口p对应的wf(k′)、wt(l′)及Δ的取值与DMRS的配置类型有关，具体可以参见有关DMRS的配置类型的描述。
四、DMRS的配置类型
DMRS的配置类型可以包括配置类型1(type1)和配置类型2(type2)，不同配置类型支持的正交DMRS端口个数和时频资源映射规则不同。下面分别对配置类型1和配置类型2进行介绍。
(1)配置类型1
针对于配置类型1，DMRS端口p对应的wf(k′)、wt(l′)及Δ的取值可以根据如下表1确定。
表1：不同DMRS端口对应的参数取值(type 1)
其中，λ为DMRS端口p所属的码分复用(code divide multiplexing，CDM)组(也可以称为正交复用组)的索引，同一CDM组内的DMRS端口占用的时频资源相同。其中，“DMRS端口占用的时频资源”也可以替换为“DMRS端口对应的时频资源”或“DMRS端口映射的时频资源”。
基于上述时频资源映射规则(即公式1)和表1中各参数的取值，可以确定不同DMRS端口对应的DMRS序列所映射的时频资源，如图2中的(a)所示。其中，DMRS端口占用的时域符号长度(或者说DMRS端口占用的时域符号数量)可以为1或2，当DMRS端口占用的时域符号长度为1时，可以称为单符号DMRS，当DMRS端口占用的时域符号长度为2时，可以称为双符号DMRS。下面分别针对单符号DMRS和双符号DMRS进行介绍。
(1.1)单符号DMRS
对于单符号DMRS(对应l’＝0)，最大支持4个正交DMRS端口。4个正交DMRS端口可分为2个CDM组，分别为CDM组0和CDM组1。其中，CDM组0包含DMRS端口0和DMRS端口1；CDM组1包含DMRS端口2和DMRS端口3。CDM组0和CDM组1频分复用(映射在不同的频域资源上)。CDM组内包含的DMRS端口映射在相同的时频资源上。CDM组内包含的DMRS端口对应的DMRS序列通过掩码序列进行区分，从而保证CDM组内DMRS端口的正交性，抑制不同DMRS端口上传输的DMRS之间的干扰。 其中，掩码序列可以为正交掩码(orthogonal cover code，OCC)序列。
具体来说，DMRS端口0和DMRS端口1位于相同的RE内，在频域以梳齿的方式进行资源映射，即DMRS端口0和DMRS端口1占用的相邻的频域资源之间间隔一个子载波。对于一个DMRS端口，频域上占用的相邻2个子载波对应一个长度为2的频域掩码序列，比如可以为(+1，+1)或(+1，-1)；时域上占用的一个时域符号对应一个长度为1的时域掩码序列，比如可以为(+1)；根据频域掩码序列和时域掩码序列可得到该DMRS端口对应的掩码序列的长度为2(该DMRS端口对应的掩码序列可以由频域掩码序列和时域掩码序列通过克罗内科乘积构成)。例如，对于时域符号0对应的子载波0和子载波2，DMRS端口0和DMRS端口1可以通过长度为2的掩码序列进行码分复用。其中，DMRS端口0对应的掩码序列为(+1，+1)，DMRS端口1对应的掩码序列为(+1，-1)。
类似地，DMRS端口2和DMRS端口3位于相同的RE内，在频域以梳齿的方式映射在DMRS端口0和DMRS端口1未占用的RE上。例如，对于时域符号0对应的子载波1和子载波3，DMRS端口2和DMRS端口3可以通过长度为2的掩码序列进行码分复用。其中，DMRS端口2对应的掩码序列为(+1，+1)，DMRS端口3对应的掩码序列为(+1，-1)。
(1.2)双符号DMRS
对于双符号DMRS(对应l’＝0或1)，最大支持8个正交DMRS端口。8个正交DMRS端口分为2个CDM组，分别为CDM组0和CDM组1。其中，CDM组0包含DMRS端口0、DMRS端口1、DMRS端口4和DMRS端口5；CDM组1包含DMRS端口2、DMRS端口3、DMRS端口6和DMRS端口7。CDM组0和CDM组1是频分复用，CDM组内包含的DMRS端口映射在相同的时频资源上，CDM组内包含的DMRS端口对应的DMRS序列通过掩码序列进行区分。
具体来说，DMRS端口0、DMRS端口1、DMRS端口4和DMRS端口5位于相同的RE内，在频域以梳齿的方式进行资源映射，即DMRS端口0、DMRS端口1、DMRS端口4和DMRS端口5占用的相邻的频域资源之间间隔一个子载波。对于一个DMRS端口，频域上占用的相邻2个子载波对应一个长度为2的频域掩码序列，比如可以为(+1，+1)或(+1，-1)；时域上占用的相邻2个时域符号对应一个长度为2的时域掩码序列，比如可以为(+1，+1)或(+1，-1)；根据频域掩码序列和时域掩码序列可得到该DMRS端口对应的掩码序列的长度为4(该DMRS端口对应的掩码序列可以由频域掩码序列和时域掩码序列通过克罗内科乘积构成)。例如，对于时域符号0和时域符号1对应的子载波0和子载波2，DMRS端口0、DMRS端口1、DMRS端口4和DMRS端口5可以通过长度为4的掩码序列进行码分复用。其中，DMRS端口0对应的掩码序列为(+1，+1，+1，+1)，DMRS端口1对应的掩码序列为(+1，+1，-1，-1)，DMRS端口4对应的掩码序列为(+1，-1，+1，-1)，DMRS端口5对应的掩码序列为(+1，-1，-1，+1)。
类似地，DMRS端口2、DMRS端口3、DMRS端口6和DMRS端口7位于相同的RE内，在频域以梳齿的方式映射在DMRS端口0、DMRS端口1、DMRS端口4和DMRS端口5未占用的子载波上。对于时域符号0和时域符号1对应的子载波1和子载波3，DMRS端口2、DMRS端口3、DMRS端口6和DMRS端口7可以通过长度为4的掩码序列进行码分复用。其中，DMRS端口2对应的掩码序列为(+1，+1，+1，+1)，DMRS端口3对应的掩码序列为(+1，+1，-1，-1)，DMRS端口6对应的掩码序列为(+1，-1，+1，-1)， DMRS端口7对应的掩码序列为(+1，-1，-1，+1)。
(2)配置类型2
针对于配置类型2，DMRS端口p对应的wf(k′)、wt(l′)及Δ的取值可以根据表2确定。
表2：不同DMRS端口对应的参数取值(type 2)
其中，λ为DMRS端口p所属的CDM组的索引，同一CDM组内的DMRS端口占用的时频资源相同。
基于上述时频资源映射规则(即公式1)和表1中各参数的取值，可以确定不同DMRS端口对应的DMRS序列所映射的时频资源，如图2中的(b)所示。其中，DMRS端口占用的时域符号长度可以为1或2，当DMRS端口占用的时域符号长度为1时，可以称为单符号DMRS，当DMRS端口占用的时域符号长度为2时，可以称为双符号DMRS。下面分别针对单符号DMRS和双符号DMRS进行介绍。
(2.1)单符号DMRS
对于单符号DMRS，最大支持6个正交DMRS端口。6个正交DMRS端口分为3个CDM组，分别为CDM组0、CDM组1和CDM组2。其中，CDM组0包含DMRS端口0和DMRS端口1；CDM组1包含DMRS端口2和DMRS端口3；CDM组2包含DMRS端口4和DMRS端口5。CDM组间是频分复用，CDM组内包含的DMRS端口所对应的DMRS映射在相同的时频资源上。CDM组内包含的DMRS端口对应的DMRS序列通过掩码序列进行区分。对于一个DMRS端口，其对应的DMRS序列在频域上映射在多个包含连续2个子载波的资源子块内，相邻的资源子块之间在频域间隔4个子载波。
具体来说，DMRS端口0和DMRS端口1位于相同的RE内，在频域以梳齿的方式进行资源映射。以频域资源粒度为1RB为例，DMRS端口0和DMRS端口1占用子载波0、子载波1、子载波6和子载波7。DMRS端口2和DMRS端口3占用子载波2、子载波3、子载波8和子载波9。DMRS端口4和DMRS端口5占用子载波4、子载波5、子载波10和子载波11。对于一个CDM组内包含的2个DMRS端口，其在相邻的2个子载波内通过长度为2的掩码序列进行码分复用，比如2个DMRS端口对应的掩码序列分别为(+1，+1)、(+1，-1)。
(2.2)双符号DMRS
对于双符号DMRS，最大支持12个正交DMRS端口。12个正交DMRS端口分为3个CDM组，其中CDM组0包含DMRS端口0、DMRS端口1、DMRS端口6和DMRS 端口7；CDM组1包含DMRS端口2、DMRS端口3、DMRS端口8和DMRS端口9；CDM组2包含DMRS端口4、DMRS端口5、DMRS端口10和DMRS端口11。CDM组间是频分复用，CDM组内包含的DMRS端口所对应的DMRS映射在相同的时频资源上。CDM组内包含的DMRS端口对应的DMRS序列通过掩码序列进行区分。对于一个DMRS端口，其对应的DMRS序列在频域映射在多个包含连续2个子载波的资源子块内，相邻的资源子块之间在频域间隔4个子载波。
具体来说，DMRS端口0、DMRS端口1、DMRS端口6和DMRS端口7位于相同的RE内，在频域以梳齿的方式进行资源映射。以频域资源粒度为1RB为例，DMRS端口0、DMRS端口1、DMRS端口6和DMRS端口7占用时域符号0和时域符号1对应的子载波0、子载波1、子载波6和子载波7。DMRS端口2、DMRS端口3、DMRS端口8和DMRS端口9占用时域符号1和时域符号2对应的子载波2、子载波3、子载波8和子载波9。DMRS端口4、DMRS端口5、DMRS端口10和DMRS端口11占用时域符号1和时域符号2对应的子载波4、子载波5、子载波10和子载波11。对于一个CDM组内包含的4个DMRS端口，其在2个时域符号对应的相邻的2个子载波内通过长度为4的掩码序列进行码分复用，比如4个DMRS端口对应的掩码序列分别为(+1，+1，+1，+1)、(+1，+1，-1，-1)、(+1，-1，+1，-1)、(+1，-1，-1，+1)。
五、DMRS端口指示
当接入网设备和终端设备通过控制信道或数据信道进行通信时，接入网设备需要向终端设备指示为终端设备分配的DMRS端口。下面结合图3，描述接入网设备向终端设备指示为终端设备分配的DMRS端口的一种可能的实现。
图3为本申请实施例提供的通信方法所对应的流程示意图，如图3所示，该流程可以包括：
S301，接入网设备向终端设备发送指示信息1，指示信息1指示DMRS的配置类型为配置类型1或配置类型2；相应地，终端设备接收指示信息1。
示例性地，接入网设备可以通过RRC消息向终端设备发送指示信息1。
S302，接入网设备向终端设备发送指示信息2，指示信息2指示DMRS端口占用的最大符号长度为1或2；相应地，终端设备接收指示信息2。
此处，DMRS端口占用的最大符号长度是指DMRS可占用的最大符号长度(或数量)，在一次传输调度中，发送端(比如接入网设备或终端设备)发送的DMRS实际占用的符号长度可以小于或等于最大符号长度。比如，当最大符号长度为2时，在一次传输调度中，发送端发送的DMRS实际占用的符号长度可以为1，或者也可以为2。又比如，当最大符号长度为1时，在一次传输调度中，发送端发送的DMRS实际占用的符号长度可以为1。
示例性地，接入网设备可以通过RRC消息向终端设备发送指示信息2。指示信息1和指示信息2可以承载于同一消息，或者也可以承载于不同消息。
可以理解的是，上述S302为可选步骤，也就是说，接入网设备也可以不向终端设备发送指示信息2，此种情形下，终端设备可以默认DMRS端口占用的最大符号长度为1。
S303，接入网设备向终端设备发送指示信息3，指示信息3指示索引值；进而，终端设备可以接收指示信息3。
示例性地，接入网设备可以通过媒体接入控制(media access control，MAC)层的消息(如MAC控制元素(control element，CE))或者物理层的消息(如下行控制信息(Downlink  control information，DCI))向终端设备发送指示信息3。
S304，终端设备根据指示信息1所指示的配置类型、指示信息2所指示的DMRS端口占用的最大符号长度以及指示信息3所指示的索引值，确定接入网设备为终端设备分配的DMRS端口。
示例性地，终端设备确定出接入网设备为终端设备分配的DMRS端口后，针对于下行传输，终端设备可以基于分配的DMRS端口，按照协议定义的DMRS符号产生方法和时频资源映射规则，在相应的时频资源上接收接入网设备发送的DMRS，并进行对应的信道估计流程；针对于上行传输，终端设备可以基于分配的DMRS端口，按照协议定义的DMRS符号产生方法和时频资源映射规则，在相应的时频资源上向接入网设备发送DMRS。
下面将结合表3A至表6B，对终端设备确定DMRS端口的一些可能的实现进行介绍。
(1)当指示信息1指示配置类型1，且DMRS端口占用的最大符号长度为1时，终端设备可以根据表3A或表3B以及指示信息3所指示的索引值，确定接入网设备为终端设备分配的DMRS端口。其中，终端设备具体使用表3A还是表3B可以由协议定义，比如当终端设备接收到DCI，且DCI中的“Transmission Configuration Indication”字段中至少存在一个字段值(codepoint)对应2个传输配置指示(transmission configuration indication，TCI)状态时，终端设备可以使用表3B，否则，终端设备可以使用表3A。
表3A：配置类型1、DMRS端口占用的最大符号长度为1
表3B：配置类型1、DMRS端口占用的最大符号长度为1

以表3A为例，比如，当指示信息3指示的索引值为“1”时，由于表3A中索引值“1”关联的DMRS端口索引为1，进而终端设备可以确定接入网设备为终端设备分配的DMRS端口为type1单符号DMRS对应的DMRS端口0至DMRS端口3中的DMRS端口1。又比如，当指示信息3指示的索引值为“2”时，由于表3A中索引值“2”关联的DMRS端口索引为0和1，进而终端设备可以确定接入网设备为终端设备分配的DMRS端口包括type1单符号DMRS对应的DMRS端口0至DMRS端口3中的DMRS端口0和DMRS端口1。
此外，表3A和表3B中，当不承载数据的CDM组的数量为1时，不承载数据的CDM组可以为CDM组0；当不承载数据的CDM组的数量为2时，不承载数据的CDM组可以包括CDM组0和CDM组1；当不承载数据的CDM组的数量为3时，不承载数据的CDM组可以包括CDM组0、CDM组1和CDM组3。本申请实施例其它表格中所涉及的“不承载数据的CDM组的数量”可以参照处理。
(2)当指示信息1指示配置类型1，且DMRS端口占用的最大符号长度为2时，终端设备可以表4A或表4B以及指示信息3所指示的索引值，确定接入网设备为终端设备分配的DMRS端口。其中，终端设备具体使用表4A还是表4B可以参照上述终端设备使用表3A还是表3B的描述。
表4A：配置类型1、DMRS端口占用的最大符号长度为2

表4B：配置类型1、DMRS端口占用的最大符号长度为2
以表4A中1个码字的情形为例，比如，当指示信息3指示的索引值为“1”时，由于 表4A中索引值“1”关联的DMRS端口索引为1，以及表4A中索引值“1”关联的DMRS端口占用的符号长度为1，进而终端设备可以确定接入网设备为终端设备分配的DMRS端口为type1单符号DMRS对应的DMRS端口0至DMRS端口3中的DMRS端口1。又比如，当指示信息3指示的索引值为“12”时，由于表4A中索引值“12”关联的DMRS端口索引为0，以及表4A中索引值“12”关联的DMRS端口占用的符号长度为2，进而终端设备可以确定接入网设备为终端设备分配的DMRS端口为type1双符号DMRS对应的DMRS端口0至DMRS端口7中的DMRS端口0。
(3)当指示信息1指示配置类型2，且DMRS端口占用的最大符号长度为1时，终端设备可以表5A或表5B以及指示信息3所指示的索引值，确定接入网设备为终端设备分配的DMRS端口。其中，终端设备具体使用表5A还是表5B可以参照上述终端设备使用表3A还是表3B的描述。
表5A：配置类型2、DMRS端口占用的最大符号长度为1

表5B：配置类型2、DMRS端口占用的最大符号长度为1
以表5A中1个码字的情形为例，比如，当指示信息3指示的索引值为“1”时，由于表5A中索引值“1”关联的DMRS端口索引为1，进而终端设备可以确定接入网设备为终端设备分配的DMRS端口为type2单符号DMRS对应的DMRS端口0至DMRS端口5的 DMRS端口1。
(4)当指示信息1指示配置类型2，且DMRS端口占用的最大符号长度为2时，终端设备可以表6A或表6B以及指示信息3所指示的索引值，确定接入网设备为终端设备分配的DMRS端口。其中，终端设备具体使用表6A还是表6B可以参照上述终端设备使用表3A还是表3B的描述。
表6A：配置类型2、DMRS端口占用的最大符号长度为2

表6B：配置类型2、DMRS端口占用的最大符号长度为2

以表6A中1个码字的情形为例，比如，当指示信息3指示的索引值为“1”时，由于表6中索引值“1”关联的DMRS端口索引为1，以及表6中索引值“1”关联的DMRS端口占用的符号长度为1，进而终端设备可以确定接入网设备为终端设备分配的DMRS端口为type2单符号DMRS对应的DMRS端口0至DMRS端口5的DMRS端口1。又比如，当指示信息3指示的索引值为“25”时，由于表6中索引值“25”关联的DMRS端口索引 为1，以及表6中索引值“25”关联的DMRS端口占用的符号长度为2，进而终端设备可以确定接入网设备为终端设备分配的DMRS端口为type2双符号DMRS对应的DMRS端口0至DMRS端口11中的DMRS端口1。
六、扩充DMRS端口
基于上述描述可知，配置类型1支持的最大正交DMRS端口数目为8，配置类型2支持的最大正交DMRS端口数目为12。当在相同时频资源上同时传输多路并行数据流时，每一路数据流可以称为一个空间层或空间流或传输流，一个DMRS端口可以与一个空间层或传输流对应。V个空间层对应的DMRS端口索引可以按照上述表3A至表6B中DMRS端口索引的顺序来确定。比如，V个空间层包括空间层0和空间层1，当接入网设备为终端设备分别的DMRS端口索引为“0,1”时，空间层0对应DMRS端口0，空间层1对应DMRS端口1；当接入网设备为终端设备分别的DMRS端口索引为“2,3”时，空间层0对应DMRS端口2，空间层1对应DMRS端口3。
然而，随着无线通信设备的部署更加密集，终端设备的数量进一步增长，对MIMO传输流数提出了更高的需求(大于12个传输流)，但最大12个DMRS端口难以保证大于12个传输流的传输的较好性能，因此，为了支持更多的传输流数，需要对DMRS端口进行扩充。
扩充DMRS端口的方法可以有多种。比如，可以通过码分复用的方式来扩充DMRS端口，或者也可以通过频分复用的方式来扩充DMRS端口。下面以通过码分复用的方式来扩充DMRS端口为例，对扩充DMRS端口的相关内容进行介绍。
(1)针对配置类型1对新增DMRS端口进行描述
以配置类型1、双符号DMRS为例，DMRS端口0至DMRS端口7可以称为现有DMRS端口，DMRS端口8至DMRS端口15为扩充的DMRS端口，可以称为新增DMRS端口。现有DMRS端口和新增DMRS端口对应的时频资源相同。下面结合图4进行介绍，其中，图4中纵向代表频域，横向代表时域，一个方格代表一个RE，一个RE在频域上对应一个子载波，在时域上对应一个时域符号。此外，由于现有DMRS端口和新增DMRS端口对应的时频资源相同，因此，图4中的(1)所示意的多个RE和(2)所示意的多个RE可以为相同的RE，图4中是为便于介绍现有DMRS端口和新增DMRS端口将其分开示意。图4中仅示意出一个RB的情形，多个RB的情形可以参照处理。
对于现有DMRS端口，如前文所述，一个CDM组包括4个DMRS端口，映射在2个子载波和2个时域符号(即4个RE)上。如图4中的(1)所示，以其中一个CDM组为例，该CDM组对应现有的DMRS端口0、DMRS端口1、DMRS端口4、DMRS端口5，在一个RB内占用索引为0/2/4/6/8/10的子载波；该CDM组的4个DMRS端口可以通过长度为4的内层掩码序列进行码分复用。具体来说，每个DMRS端口可以对应一个长度为2的内层频域掩码序列和一个长度为2的内层时域掩码序列，即每个DMRS端口可以对应一个长度为4的内层掩码序列(表示为(w1,w2,w3,w4))，每个内层掩码序列中的元素与4个RE一一对应。其中，该长度为4的内层掩码序列可以由对应的内层频域掩码序列和内层时域掩码序列通过克罗内科乘积构成。一个CDM组的4个DMRS端口中的任意两个DMRS端口对应的内层掩码序列正交。
比如，DMRS端口0对应的内层掩码序列(w1,w2,w3,w4)为(+1+1+1+1)；DMRS端口1对应的内层掩码序列(w1,w2,w3,w4)可以为(+1+1-1-1)；DMRS端口4对应的内层 掩码序列(w1,w2,w3,w4)可以为(+1-1+1-1)；DMRS端口5对应的内层掩码序列(w1,w2,w3,w4)可以为(+1-1-1+1)。
对于新增DMRS端口，同样可以对应2个CDM组，每个CDM组对应4个DMRS端口。一个CDM组对应4个DMRS端口，映射在2个子载波和2个时域符号(即4个RE)上。如图4中的(2)所示，以其中一个CDM组为例，该CDM组对应新增的DMRS端口8、DMRS端口9、DMRS端口12、DMRS端口13，在一个RB内占用索引为0/2/4/6/8/10的子载波；该CDM组的4个DMRS端口可以通过长度为4的内层掩码序列进行码分复用。具体来说，每个DMRS端口可以对应一个长度为2的内层频域掩码序列和一个长度为2的内层时域掩码序列，即每个DMRS端口可以对应一个长度为4的内层掩码序列(表示为(c1,c2,c3,c4))，每个内层掩码序列中的元素与4个RE一一对应。其中，该长度为4的内层掩码序列可以由对应的内层频域掩码序列和内层时域掩码序列通过克罗内科乘积构成。一个CDM组的4个DMRS端口中的任意两个DMRS端口对应的内层掩码序列正交。下面结合示例a1和示例a2描述内层掩码序列的两种可能的实现。
示例a1，DMRS端口8对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，+1，+1，+1)；DMRS端口9对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，+1，-1，-1)；DMRS端口12对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，-1，+1，-1)；DMRS端口13对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，-1，-1，+1)。
示例a2，DMRS端口8对应的内层掩码序列(c1,c2,c3,c4)可以为(+1,+j,+j,-1)；DMRS端口9对应的内层掩码序列(c1,c2,c3,c4)可以为(+1,+j,-j,+1)；DMRS端口12对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，-j，+j，+1)；DMRS端口13对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，-j，-j，-1)。
进一步地，对于DMRS端口映射的连续4个子载波(这4个子载波可以称为一组子载波)，现有的4个DMRS端口(比如DMRS端口0、DMRS端口1、DMRS端口4、DMRS端口5)和新增的4个DMRS端口(比如DMRS端口8、DMRS端口9、DMRS端口12、DMRS端口13)可以通过长度为4的外层掩码序列(b1,b2,b3,b4)进行码分复用。例如，针对于子载波0、子载波2、子载波4和子载波6，现有的4个DMRS端口(比如DMRS端口0、DMRS端口1、DMRS端口4、DMRS端口5)和新增的4个DMRS端口(比如DMRS端口8、DMRS端口9、DMRS端口12、DMRS端口13)可以通过长度为4的外层掩码序列(b1,b2,b3,b4)进行码分复用。其中，现有的4个DMRS端口对应的外层掩码序列(b1,b2,b3,b4)比如为(+1，+1，+1，+1)，新增的4个DMRS端口对应的外层掩码序列(b1,b2,b3,b4)比如为(+1，+1，-1，-1)，这两个外层掩码序列正交。其中，外层掩码序列(b1,b2,b3,b4)的一个元素对应一组子载波中的一个子载波。例如，子载波0对应序列元素b1，子载波2对应序列元素b2，子载波4对应序列元素b3，子载波6对应序列元素b4。
(2)针对配置类型2对新增DMRS端口进行描述
以配置类型2、双符号DMRS为例，DMRS端口0至DMRS端口11可以称为现有DMRS端口，DMRS端口12至DMRS端口23为扩充的DMRS端口，可以称为新增DMRS端口。现有DMRS端口和新增DMRS端口对应的时频资源相同。下面结合图5进行介绍，其中，图5中的(1)所示意的多个RE和(2)所示意的多个RE可以为相同的RE，其它可以参照图4的描述。
对于现有DMRS端口，如前文所述，一个CDM组包括4个DMRS端口，映射在2 个子载波和2个时域符号(即4个RE)上。如图5中的(1)所示，以其中一个CDM组为例，该CDM组对应现有的DMRS端口0、DMRS端口1、DMRS端口6、DMRS端口7，在一个RB内占用索引为0/1//6/7的子载波；该CDM组的4个DMRS端口可以通过长度为4的内层掩码序列进行码分复用。具体来说，每个DMRS端口可以对应一个长度为2的内层频域掩码序列和一个长度为2的内层时域掩码序列，即每个DMRS端口可以对应一个长度为4的内层掩码序列(表示为(w1,w2,w3,w4))，每个内层掩码序列中的元素与4个RE一一对应。其中，该长度为4的内层掩码序列可以由对应的内层频域掩码序列和内层时域掩码序列通过克罗内科乘积构成。一个CDM组的4个DMRS端口中的任意两个DMRS端口对应的内层掩码序列正交。
比如，DMRS端口0对应的内层掩码序列(w1,w2,w3,w4)为(+1，+1，+1，+1)；DMRS端口1对应的内层掩码序列(w1,w2,w3,w4)可以为(+1，+1，-1，-1)；DMRS端口6对应的内层掩码序列(w1,w2,w3,w4)可以为(+1，-1，+1，-1)；DMRS端口7对应的内层掩码序列(w1,w2,w3,w4)可以为(+1，-1，-1，+1)。
对于新增DMRS端口，同样可以对应2个CDM组，每个CDM组对应4个DMRS端口。一个CDM组对应4个DMRS端口，映射在2个子载波和2个时域符号(即4个RE)上。如图5中的(2)所示，以其中一个CDM组为例，该CDM组对应新增的DMRS端口12、DMRS端口13、DMRS端口18、DMRS端口19，在一个RB内占用索引为0/1//6/7的子载波；该CDM组的4个DMRS端口可以通过长度为4的内层掩码序列进行码分复用。具体来说，每个DMRS端口可以对应一个长度为2的内层频域掩码序列和一个长度为2的内层时域掩码序列，即每个DMRS端口可以对应一个长度为4的内层掩码序列(表示为(c1,c2,c3,c4))，每个内层掩码序列中的元素与4个RE一一对应。其中，该长度为4的内层掩码序列可以由对应的内层频域掩码序列和内层时域掩码序列通过克罗内科乘积构成。一个CDM组的4个DMRS端口中的任意两个DMRS端口对应的内层掩码序列正交。下面结合示例b1和示例b2描述内层掩码序列的两种可能的实现。
示例b1，DMRS端口12对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，+1，+1，+1)；DMRS端口13对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，+1，-1，-1)；DMRS端口18对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，-1，+1，-1)；DMRS端口19对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，-1，-1，+1)。
示例b2，DMRS端口12对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，+j，+j，-1)；DMRS端口13对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，+j，-j，+1)；DMRS端口18对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，-j，+j，+1)；DMRS端口19对应的内层掩码序列(c1,c2,c3,c4)可以为(+1，-j，-j，-1)。
进一步地，对于DMRS端口映射的连续4个子载波(这4个子载波可以称为一组子载波)，现有的4个DMRS端口(比如DMRS端口0、DMRS端口1、DMRS端口6、DMRS端口7)和新增的4个DMRS端口(比如DMRS端口12、DMRS端口13、DMRS端口18、DMRS端口19)可以通过长度为4的外层掩码序列(b1,b2,b3,b4)进行码分复用。例如，针对于子载波0、子载波1、子载波6和子载波7，现有的4个DMRS端口(比如DMRS端口0、DMRS端口1、DMRS端口6、DMRS端口7)和新增的4个DMRS端口(比如DMRS端口12、DMRS端口13、DMRS端口18、DMRS端口19)可以通过长度为4的外层掩码序列(b1,b2,b3,b4)进行码分复用。其中，现有的4个DMRS端口对应的外层掩码 序列(b1,b2,b3,b4)比如为(+1，+1，+1，+1)，新增的4个DMRS端口对应的外层掩码序列(b1,b2,b3,b4)比如为(+1，+1，-1，-1)，这两个外层掩码序列正交。其中，外层掩码序列(b1,b2,b3,b4)的一个元素对应一组子载波中的一个子载波，例如，子载波0对应序列元素b1，子载波1对应序列元素b2，子载波6对应序列元素b3，子载波7对应序列元素b4。
基于上述(1)和(2)中的描述，当采用码分复用的方式扩充DMRS端口后，如表7所示，配置类型1、单符号DMRS最大可以支持8个端口，配置类型1、双符号DMRS最大可以支持16个端口，配置类型2、单符号DMRS最大可以支持12个端口，配置类型2、双符号DMRS最大可以支持24个端口。
表7：不同配置类型对应的现有DMRS端口和新增DMRS端口
(3)扩充DMRS端口后的时频资源映射规则
针对于现有DMRS端口来说，一个现有DMRS端口对应的DMRS序列可以通过时频资源映射规则，与对应的内层掩码序列和外层掩码序列相乘后映射到对应的时频资源上。针对于新增DMRS端口来说，一个新增DMRS端口对应的DMRS序列可以通过时频资源映射规则，与对应的内层掩码序列和外层掩码序列相乘后映射到对应的时频资源上。
因此，当扩充DMRS端口后，时频资源映射规则可以满足如下公式2：


k′＝0,1；

n＝0,1,...；
l′＝0,1；
其中，p为DMRS端口的索引，μ为子载波间隔参数，为映射至索引为(k,l)p,μ的RE上的DMRS端口p对应的DMRS符号，为功率缩放因子或功率控制因子，ct(l′)为索引为l′的时域符号对应的内层时域掩码序列元素，cf(k′)为索引为k′的子载波对应的内层频域掩码序列元素。b(n mod 2)为外层掩码序列，其中，针对于现有DMRS端口，b(0)＝1，b(1)＝1；针对于新增DMRS端口，b(0)＝1，b(1)＝-1，或者b(0)＝-1，b(1)＝1。m＝2n+k′，Δ为子载波偏移因子，为DMRS符号占用的起始时域符号的符号索引或参考时域符号的符号索引。
可以理解的是，参照上述公式1的形式，可以将公式2等效描述为如下公式3：

sf(k′)＝cf(k′)b(n mod 2)
st(l′)＝ct(l′)
其中，sf(k′)为索引为k′的子载波对应的频域掩码序列元素，st(l′)为索引为l′的时域符号对应的时域掩码序列元素。
根据公式3可以看出，当扩充DMRS端口后，每个DMRS端口对应的频域掩码序列可以等效表示为内层频域掩码序列cf(k′)和外层掩码序列{b(0),b(1)}的乘积。其中，外层掩码序列元素b(0)对应DMRS端口占用的一组子载波中2个相邻子载波，即外层掩码序列元素b(0)对应cf(0)和cf(1)。同样地，外层掩码序列元素b(1)对应DMRS端口占用的一组子载波中另外2个相邻子载波，即外层掩码序列元素b(1)对应cf(0)和cf(1)。因此，每个DMRS端口对应的频域掩码序列的长度为4，可以表示(cf(0)b(0),cf(1)b(0),cf(0)b(1),cf(1)b(1))。而在未扩充DMRS端口的情况下(参照前文的描述)，每个DMRS端口对应的频域掩码序列的长度为2。
进一步地，上述公式2或公式3中，DMRS端口p对应的cf(k′)、ct(l′)及Δ的取值与DMRS的配置类型有关，具体可以参见下文(3.1)和(3.2)中的描述。
(3.1)配置类型1
针对于配置类型1，DMRS端口p对应的cf(k′)、ct(l′)及Δ的取值可以根据如下表8A或表8B确定。其中，当采用上述示例a1所描述的内层掩码序列时，cf(k′)、ct(l′)及Δ的取值可以根据表8A来确定；当采用上述示例a2所描述的内层掩码序列时，cf(k′)、ct(l′)及Δ的取值可以根据表8B来确定。
表8A：不同DMRS端口对应的参数取值(type 1)
表8B：不同DMRS端口对应的参数取值(type 1)
(3.2)配置类型2
针对于配置类型2，DMRS端口p对应的cf(k′)、ct(l′)及Δ的取值可以根据如下表9A或9B确定。其中，当采用上述示例b1所描述的内层掩码序列时，cf(k′)、ct(l′)及Δ的取值可以根据表9A来确定；当采用上述示例b2所描述的内层掩码序列时，cf(k′)、ct(l′)及Δ的取值可以根据表9B来确定。
表9A：不同DMRS端口对应的参数取值(type 2)
表9B：不同DMRS端口对应的参数取值(type 2)
基于上述相关技术特征的描述，本申请实施例将针对扩充DMRS端口后，接入网设备如何向终端设备指示为终端设备分配的DMRS端口进行研究。
在介绍本申请实施例提供的通信方法之前，先对本申请实施例涉及相关概念进行解释说明。
DMRS端口索引组：一个DMRS端口索引组可以包括一个或多个DMRS端口索引，一个DMRS端口索引组可以与一个索引值关联。
集合：一个集合可以包括一个或多个DMRS端口索引组。针对于一个集合，比如该集合包括N个DMRS端口索引组，当N个DMRS端口索引组中的每个DMRS端口索引组包 括M个DMRS端口索引中的至少一个DMRS端口索引时，可以认为M个DMRS端口索引与该集合对应。其中，M、N为正整数。
关联关系：属于不同集合的两个DMRS端口索引组(比如第一DMRS端口索引组和第二DMRS端口索引组)可以具有关联关系。
作为一种可能的实现，第一DMRS端口索引组和第二DMRS端口索引组具有关联关系可以包括以下一项或多项：
①第一DMRS端口索引组和第二DMRS端口索引组关联的索引值相同。
②第一DMRS端口索引组和第二DMRS端口索引组中的DMRS端口索引一一对应。示例性地，相对应的两个DMRS端口索引之间可以具有偏移量。
③第一DMRS端口索引组为第二DMRS端口索引组的子集。示例性地，第二DMRS端口索引组可以包括第一DMRS端口索引组中的端口索引，还包括第一DMRS端口索引组中的DMRS端口索引对应的DMRS端口索引。比如，第一DMRS端口索引组包括第一DMRS端口索引，第一DMRS端口索引对应的DMRS端口索引与第一DMRS端口索引之间具有偏移量。
本申请实施例中，将以第一DMRS端口索引组和第二DMRS端口索引组之间的关联关系为第一关联关系或第二关联关系为例进行描述。其中，第一DMRS端口索引组和第二DMRS端口索引组具有第一关联关系可以包括上述①和②，第一DMRS端口索引组和第二DMRS端口索引组具有第二关联关系可以包括上述①和③。
下面将基于第一关联关系和第二关联关系，针对不同配置类型，对集合和DMRS端口索引组进行详细介绍。
一、第一关联关系
(1)配置类型1、单符号DMRS
针对于配置类型1、单符号DMRS对应的4个现有DMRS端口索引(即“0～3”)，以表3A为例(表3B可以参照处理)，这4个DMRS端口索引对应集合1，集合1可以包括表3A中索引值“0～11”关联的12个DMRS端口索引组。每个DMRS端口索引组中包括一个或多个DMRS端口索引，例如索引值“2”关联的DMRS端口索引组中包括的DMRS端口索引为“0”和“1”。也可以这样理解这4个DMRS端口索引与集合1的对应关系：集合1包括12个DMRS端口索引组，对于任意一个DMRS端口索引组，该端口索引组中所包括的DMRS端口索引都是这4个DMRS端口索引中的一个或多个DMRS端口索引。
针对于配置类型1、单符号DMRS对应的4个新增DMRS端口索引(即“4～7”)，以表10A为例(表10B可以参照处理)，这4个DMRS端口索引对应集合2，集合2可以包括表10A中索引值“0～11”关联的12个DMRS端口索引组。其中，集合2中包括的DMRS端口索引组与集合1中包括的DMRS端口索引组具有第一关联关系。
表10A：配置类型1、DMRS端口占用的最大符号长度为1(新增DMRS端口)

表10B：配置类型1、DMRS端口占用的最大符号长度为1(新增DMRS端口)
上述表10A与表3A对应，表10B与表3B对应。以表10A与表3A为例，举个例子，集合1中包括DMRS端口索引组a1，DMRS端口索引组a1为表3A中示出的12个DMRS端口索引组中的任意一个DMRS端口索引组，集合2中包括DMRS端口索引组b1，DMRS端口索引组b1为表10A中示出的12个DMRS端口索引组中的任意一个DMRS端口索引组。DMRS端口索引组a1与DMRS端口索引组b1具有第一关联关系；具体来说，DMRS端口索引组a1与DMRS端口索引组b1关联相同索引值，DMRS端口索引组a1中的DMRS端口索引与DMRS端口索引组b1中的DMRS端口索引一一对应，相对应的DMRS端口索引之间具有偏移量。
其中，偏移量的取值可以根据配置类型和DMRS端口占用的符号长度来确定。当配置 类型为配置类型1，且DMRS端口占用的符号长度为1时，偏移量的取值可以为4，即偏移量的取值可以等于集合1对应的DMRS端口索引的个数，或者说偏移量的取值可以等于配置类型1、单符号DMRS最大支持的正交DMRS端口的个数。
比如，索引值“0”关联的表3A中的DMRS端口索引组a1包括的DMRS端口索引为“0”，索引值“0”关联的表10A中的DMRS端口索引组b1包括的DMRS端口索引为“4”，DMRS端口索引“0”和“4”之间的偏移量为4。
又比如，索引值“2”关联的表3A中的DMRS端口索引组a1包括的DMRS端口索引为“0”和“1”，索引值“2”关联的表10A中的DMRS端口索引组b1包括的DMRS端口索引为“4”和“5”。其中，DMRS端口索引“0”与“4”对应，二者之间的偏移量为4；DMRS端口索引“1”与“5”对应，二者之间的偏移量为4。
(2)配置类型1、双符号DMRS
针对于配置类型1、双符号DMRS对应的8个现有DMRS端口索引(即“0～7”)，以表4A中1个码字的情形为例(表4B可以参照处理)，这8个DMRS端口索引对应集合3，集合3包括表4A中索引值“12～30”关联的19个DMRS端口索引组。
针对于配置类型1、双符号DMRS对应的8个新增DMRS端口索引(即“8～15”)，以表11A中1个码字的情形为例(表11B可以参照处理)，以1个码字的情形为例，这8个DMRS端口索引对应集合4，集合4可以包括表11A中索引值“12～30”关联的19个DMRS端口索引组。其中，集合4中包括的DMRS端口索引组与集合3中包括的DMRS端口索引组具有第一关联关系。
表11A：配置类型1、DMRS端口占用的最大符号长度为2(新增DMRS端口)

表11B：配置类型1、DMRS端口占用的最大符号长度为2(新增DMRS端口)

上述表11A与表4A对应，表11B与表4B对应。以表11A与表4A为例，集合3中包括DMRS端口索引组a2，DMRS端口索引组a2为表4A中示出的19个DMRS端口索引组中的任意一个DMRS端口索引组。集合4中包括DMRS端口索引组b2，DMRS端口索引组b2为表11A中示出的19个DMRS端口索引组中的任意一个DMRS端口索引组。DMRS端口索引组a2与DMRS端口索引组b2具有第一关联关系；具体来说，DMRS端口索引组a2与DMRS端口索引组b2关联相同索引值，DMRS端口索引组a2中的端口索引与DMRS端口索引组b2中的端口索引一一对应，相对应的端口索引之间具有偏移量。
其中，偏移量的取值可以根据配置类型和DMRS端口占用的符号长度来确定。当配置类型为配置类型1，且DMRS端口占用的符号长度为2时，偏移量的取值可为8，即偏移量的取值可以等于集合3对应的DMRS端口索引的个数，或者说偏移量的取值可以等于配置类型1、双符号DMRS最大支持的正交DMRS端口的个数。
以1个码字的情形为例，比如，索引值“12”关联的表4A中的DMRS端口索引组a2包括的DMRS端口索引为“0”，索引值“12”关联的表11A中的DMRS端口索引组b2包括的DMRS端口索引为“8”，DMRS端口索引“0”和“8”之间的偏移量为8。
又比如，索引值“20”关联的表4A中的DMRS端口索引组a2包括的DMRS端口索引为“0”和“1”，索引值“20”关联的表11A中的DMRS端口索引组b2包括的DMRS端口索引为“8”和“9”。其中，DMRS端口索引“0”与“8”对应，二者之间的偏移量为8；DMRS端口索引“1”与“9”对应，二者之间的偏移量为8。
(3)配置类型2、单符号DMRS
针对于配置类型2、单符号DMRS对应的6个现有DMRS端口索引(即“0～5”)，以表5A中1个码字的情形为例(表5B可以参照处理)，这5个DMRS端口索引对应集合5，集合5包括表5A中索引值“0～23”关联的24个DMRS端口索引组。
针对于配置类型1、单符号DMRS对应的6个新增DMRS端口索引(即“6～11”)，以表12A中1个码字的情形为例(表12B可以参照处理)，这6个DMRS端口索引对应集合6，集合6可以包括表12A中索引值“0～23”关联的24个DMRS端口索引组。其中，集合6中包括的DMRS端口索引组与集合5中包括的DMRS端口索引组具有第一关联关系。
表12A：配置类型2、DMRS端口占用的最大符号长度为1(新增DMRS端口)
表12B：配置类型2、DMRS端口占用的最大符号长度为1(新增DMRS端口)

上述表12A与表5A对应，表12B与表5B对应。以表12A与表5A为例，集合5中包括DMRS端口索引组a3，DMRS端口索引组a3为表5A中示出的24个DMRS端口索引组中的任意一个DMRS端口索引组。集合6中包括DMRS端口索引组b3，DMRS端口索引组b3为表12A中示出的24个DMRS端口索引组中的任意一个DMRS端口索引组。DMRS端口索引组a3与DMRS端口索引组b3具有第一关联关系；具体来说，DMRS端口索引组a3与DMRS端口索引组b3关联相同索引值，DMRS端口索引组a3中的端口索引与DMRS端口索引组b3中的端口索引一一对应，相对应的端口索引之间具有偏移量。
其中，偏移量的取值可以根据配置类型和DMRS端口占用的符号长度来确定。当配置类型为配置类型2，且DMRS端口占用的符号长度为1时，偏移量的取值可以为6，即偏移量的取值可以等于集合5对应的DMRS端口索引的个数，或者说偏移量的取值可以等于配置类型2、单符号DMRS最大支持的正交DMRS端口的个数。
以1个码字的情形为例，比如，索引值“0”关联的表5A中的DMRS端口索引组a3包括的DMRS端口索引为“0”，索引值“0”关联的表12A中的DMRS端口索引组b3包括的DMRS端口索引为“6”，DMRS端口索引“0”和“6”之间的偏移量为6。
又比如，索引值“2”关联的表5A中的DMRS端口索引组a3包括的DMRS端口索引为“0”和“1”，索引值“2”关联的表12A中的DMRS端口索引组b3包括的DMRS端口索引为“6”和“7”。其中，DMRS端口索引“0”与“6”对应，二者之间的偏移量为6；DMRS端口索引“1”与“7”对应，二者之间的偏移量为6。
(4)配置类型2、双符号DMRS
针对于配置类型2、双符号DMRS对应的12个现有DMRS端口索引(即“0～11”)，以表6A中1个码字的情形为例(表6B可以参照处理)，这12个DMRS端口索引对应集 合7，集合7包括表6A中索引值“24～57”关联的34个DMRS端口索引组。
针对于配置类型2、双符号DMRS对应的8个新增DMRS端口索引(即“12～23”)，以表13A中1个码字的情形为例(表13B可以参照处理)，这12个DMRS端口索引对应集合8，集合8可以包括表13A中索引值“24～57”关联的34个DMRS端口索引组。其中，集合8中包括的DMRS端口索引组与集合7中包括的DMRS端口索引组具有第一关联关系。
表13A：配置类型2、DMRS端口占用的最大符号长度为2(新增DMRS端口)

表13B：配置类型2、DMRS端口占用的最大符号长度为2(新增DMRS端口)

上述表13A与表6A对应，表13B与表6B对应。以表13A与表6A为例，集合7中包括DMRS端口索引组a4，DMRS端口索引组a4为表6A中示出的34个DMRS端口索引组中的任意一个DMRS端口索引组。集合8中包括DMRS端口索引组b4，DMRS端口索引组b4为表13A中示出的34个DMRS端口索引组中的任意一个DMRS端口索引组。DMRS端口索引组a4与DMRS端口索引组b4具有第一关联关系；具体来说，DMRS端口索引组a4与DMRS端口索引组b4关联相同索引值，DMRS端口索引组a4中的端口索引与DMRS端口索引组b4中的端口索引一一对应，相对应的端口索引之间具有偏移量。
其中，偏移量的取值可以根据配置类型和DMRS端口占用的符号长度来确定。当配置类型为配置类型2，且DMRS端口占用的符号长度为2时，偏移量的取值可以为12，即偏移量的取值可以等于集合7对应的DMRS端口索引的个数，或者说偏移量的取值可以等于配置类型2、双符号DMRS最大支持的正交DMRS端口的个数。
以1个码字的情形为例，比如，索引值“24”关联的表6A中的DMRS端口索引组a4包括的DMRS端口索引为“0”，索引值“24”关联的表13A中的DMRS端口索引组b4包括的DMRS端口索引为“12”，DMRS端口索引“0”和“12”之间的偏移量为12。
又比如，索引值“36”关联的表6A中的DMRS端口索引组a4包括的DMRS端口索引为“0”和“1”，索引值“36”关联的表13A中的DMRS端口索引组b4包括的DMRS端口索引为“12”和“13”。其中，DMRS端口索引“0”与“12”对应，二者之间的偏移量为12；DMRS端口索引“1”与“13”对应，二者之间的偏移量为12。
二、第二关联关系
下面将针对配置类型1、单符号DMRS的情形进行描述，其它情形可以参照处理，不再赘述。
针对于配置类型1、单符号DMRS对应的4个现有DMRS端口索引(即“0～3”)，以表3A为例(表3B可以参照处理)，这4个DMRS端口索引对应集合1，集合1可以包括表3A中索引值“0～11”关联的12个DMRS端口索引组。
当扩充DMRS端口后，配置类型1、单符号DMRS可以对应8个DMRS端口索引(即“0～7”，其中“0～3”为现有DMRS端口索引，“4～7”为新增DMRS端口索引)，以表14A为例(表14B可以参照处理)，这8个DMRS端口索引对应集合2，集合2可以包括表14A中索引值“0～11”关联的12个DMRS端口索引组。其中，集合2中包括的DMRS端口索引组与集合1中包括的DMRS端口索引组具有第二关联关系。
表14A：配置类型1、DMRS端口占用的最大符号长度为1

表14B：配置类型1、DMRS端口占用的最大符号长度为1
上述表14A与表3A对应，表14B与表3B对应。以表14A与表3A为例，举个例子，集合1中包括DMRS端口索引组a1，DMRS端口索引组a1为表3A中示出的12个DMRS端口索引组中的任意一个DMRS端口索引组，集合2中包括DMRS端口索引组b1，DMRS端口索引组b1为表14A中示出的12个DMRS端口索引组中的任意一个DMRS端口索引组。DMRS端口索引组a1与DMRS端口索引组b1具有第二关联关系；具体来说，DMRS端口索引组a1与DMRS端口索引组b1关联相同索引值，DMRS端口索引组a1为DMRS端口索引组b1的子集。其中，DMRS端口索引组b1包括DMRS端口索引组a1，还包括DMRS端口索引组a1中的DMRS端口索引对应的DMRS端口索引，相对应的两个DMRS端口索引之间具有偏移量。其中，偏移量的取值可以根据配置类型和DMRS端口占用的符号长度来确定。当配置类型为配置类型1，且DMRS端口占用的符号长度为1时，偏移量的取值可以为4。
比如，索引值“0”关联的表3A中的DMRS端口索引组a1包括的DMRS端口索引为 “0”，索引值“0”关联的表14A中的DMRS端口索引组b1包括的DMRS端口索引为“0”和“4”，DMRS端口索引“0”和“4”之间的偏移量为4。
又比如，索引值“2”关联的表3A中的DMRS端口索引组a1包括的DMRS端口索引为“0”和“1”，索引值“2”关联的表14A中的DMRS端口索引组b1包括的DMRS端口索引为“0”、“1”、“4”和“5”。其中，DMRS端口索引“0”与“4”对应，二者之间的偏移量为4；DMRS端口索引“1”与“5”对应，二者之间的偏移量为4。
可以理解的是，本申请实施例所涉及的表格(比如表1至表14B)均可以由协议定义。
下面将结合图6对本申请实施例提供的通信方法进行介绍。
图6为本申请实施例提供的通信方法所对应的流程示意图，如图6所示，该方法可以包括：
S601，接入网设备向终端设备发送第一指示信息；相应地，终端设备可以接收第一指示信息。
示例性地，第一指示信息可以指示第一索引值，第一索引值可以关联第一集合所包括的多个端口索引组中的第一端口索引组和第二集合所包括的多个端口索引组中的第二端口索引组。也就是说，第一端口索引组和第二端口索引组关联相同的索引值。
示例性地，第一指示信息可以承载于MAC CE或DCI。当第一指示信息承载于DCI时，该DCI所采用的格式(format)比如可以为DCI format 0_1、DCI format 0_2、DCI format1_1或者DCI format 1_2。
S602，接入网设备向终端设备发送第二指示信息，第二指示信息指示第一值或第二值；相应地，终端设备可以接收第二指示信息。
其中，当第二指示信息指示第一值时，第一指示信息通过第一索引值向终端设备指示第一端口索引组，此种情形下，接入网设备为终端设备分配的端口索引为第一端口索引组中的端口索引。当第二指示信息指示第二值时，第一指示信息通过第一索引值向终端设备指示第二端口索引组，此种情形下，接入网设备为终端设备分配的端口索引为第二端口索引组中的端口索引。
下面结合实现方式1和实现方式2描述两种可能的实现。
(1)实现方式1
在实现方式1中，第二指示信息可以承载于RRC消息，比如第二指示信息可以为RRC消息中的dmrs-Type字段。其中，第一值用于指示配置类型1对应的现有DMRS端口，第二值用于指示配置类型1对应的新增DMRS端口，比如第一值可以为“type1”，第二值可以为“type1-E”。或者，第一值用于指示配置类型2对应的现有DMRS端口，第二值用于指示配置类型2对应的新增DMRS端口，比如第一值可以为“type2”，第二值可以为“type2-E”。也就是说，第二指示信息可以指示type1，type2，type1-E，type2-E中的任一项。
示例性地，接入网设备还可以向终端设备发送第四指示信息，第四指示信息指示参考信号(比如DMRS)占用的最大符号长度，比如最大符号长度可以为长度1(len1)或长度2(len2)，长度1可以是指为1个符号，长度2可以指2个符号。其中，第四指示信息可以承载于RRC消息，比如第四指示信息可以为RRC消息中的maxLength字段。第四指示信息和第二指示信息可以承载于同一消息，或者也可以承载于不同消息。当第四指示信 息和第二指示信息承载于不同消息中，本申请实施例对接入网设备发送不同消息的先后顺序不做限定。
以第四指示信息和第二指示信息承载于同一RRC消息为例，RRC消息的一种可能的信令结构如下所示：
(2)实现方式2
在实现方式2中，第二指示信息可以承载于MAC CE或DCI。第二指示信息和第一指示信息可以承载于同一消息，或者也可以承载于不同消息，具体不做限定。其中，第一值用于指示现有DMRS端口，第二值用于指示新增DMRS端口。比如第二指示信息包括1个比特位，当该比特位取值为“0”时，指示现有DMRS端口，当该比特位取值为“1”时，指示新增DMRS端口。
示例性地，接入网设备还可以向终端设备发送第四指示信息和第五指示信息，第四指示信息指示参考信号(比如DMRS)占用的最大符号长度，第五指示信息指示参考信号(比如DMRS)的配置类型，比如第五指示信息可以指示“type1”或“type2”。其中，第五指示信息可以承载于RRC消息，比如第五指示信息可以为RRC消息中的dmrs-Type字段。第四指示信息和第五指示信息可以承载于同一消息，或者也可以承载于不同消息。
当第四指示信息和第五指示信息承载于同一RRC消息时，RRC消息的一种可能的信令结构如下所示：
下面将基于实现方式1，以第一端口索引组和第二端口索引组具有第一关联关系为例，描述两种可能的情形。
情形1：第二指示信息指示“type1”或“type1-E”。
当第二指示信息指示第一值，例如第二指示信息指示“type1”，终端设备根据第二指示信息可以确定第一指示信息指示第一集合中的第一端口索引组。当第二指示信息指示第二值，例如第二指示信息指示“type1-E”，终端设备根据第二指示信息可以确定第一指示 信息指示第二集合中的第二端口索引组。
(1)DMRS端口占用的最大符号长度为1
当DMRS端口占用的最大符号长度为1时，以第一指示信息指示的第一索引值为“2”为例，若第二指示信息指示“type1”，则终端设备根据第二指示信息可以确定第一指示信2指示第一集合中的第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”；若第二指示信息指示“type1-E”，则终端设备根据第二指示信息可以确定第一指示信息指示第二集合中的第二端口索引组，第二端口索引组包括的端口索引为“4”和“5”。
其中，终端设备可以通过多种方式确定第一指示信息所指示的端口索引组，比如方式一和方式二。
(1.1)方式一
第一集合所包括的多个端口索引组通过表3A示出，第二集合所包括的多个端口索引组通过表10A示出；或者，第一集合所包括的多个端口索引组通过表3B示出，第二集合所包括的多个端口索引组通过表10B示出。
当第二指示信息指示“type1”时，终端设备可以确定需要查询的表格为表3A(此处是以表3A为例，表3B可以参照处理)。当第一指示信息指示的第一索引值为“2”时，终端设备根据第一索引值和表3A，可以确定第一指示信息指示第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。
当第二指示信息指示“type1-E”，终端设备可以确定需要查询的表格为表10A(此处是以表10A为例，表10B可以参照处理)。当第一指示信息指示的第一索引值为“2”时，终端设备根据第一索引值和表10A，可以确定第一指示信息指示第二端口索引组，第二端口索引组包括的端口索引为“4”和“5”。
采用上述方式一，在引入新增DMRS端口后，当接入网设备为终端设备分配的端口为新增DMRS端口时，可以通过查询新增DMRS端口对应的表格确定出接入网设备为终端设备分配的端口，由于新增DMRS端口对应的表格可以参照现有DMRS端口对应的表格来设计，从而能够有效降低实现的复杂度。
(1.2)方式二
第一集合所包括的多个端口索引组通过表3A或表3B示出，第二集合所包括的多个端口索引组通过第一端口集合中的多个端口索引组所包括的端口索引和偏移量得到。
当第二指示信息指示“type1”，终端设备可以确定需要查询的表格为表3A(此处是以表3A为例，表3B可以参照处理)。当第一指示信息指示的第一索引值为“2”时，终端设备根据第一索引值和表3A，可以确定第一指示信息指示第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。
当第二指示信息指示“type1-E”，第一指示信息指示的第一索引值为“2”时，终端设备根据第一索引值可以确定第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。进一步地，由于第一指示信息指示的是第二集合中的第二端口索引组，因此，终端设备根据第一端口索引组中的端口索引“0”和“1”与偏移量(取值为4)，得到第二端口索引组的端口索引为“4”和“5”。
采用上述方式二，在引入新增DMRS端口后，当接入网设备为终端设备分配的端口为新增DMRS端口时，可以复用现有DMRS端口对应的表格，从而能够有效降低实现的复杂度。
(2)DMRS端口占用的最大符号长度为2
当DMRS端口占用的最大符号长度为2时，以第一索引值为“20”为例，若第二指示信息指示“type1”，则终端设备根据第二指示信息可以确定第一指示信息指示第一集合中的第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”；若第二指示信息指示“type1-E”，则终端设备根据第二指示信息可以确定第一指示信息指示第二集合中的第二端口索引组，第二端口索引组包括的端口索引为“4”和“5”。
其中，终端设备可以通过多种方式确定第一指示信息所指示的端口索引组，比如方式一和方式二。
(2.1)方式一
第一集合所包括的多个端口索引组通过表4A示出，第二集合所包括的多个端口索引组通过表11A示出；或者，第一集合所包括的多个端口索引组通过表4B示出，第二集合所包括的多个端口索引组通过表11B示出。
当第二指示信息指示“type1”时，终端设备可以确定需要查询的表格为表4A(此处是以表4A为例，表4B可以参照处理)。当第一指示信息指示的第一索引值为“20”时，终端设备根据第一索引值和表4A，可以确定第一指示信息指示第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。
当第二指示信息指示“type1-E”，终端设备可以确定需要查询的表格为11A(此处是以表11A为例，表11B可以参照处理)。当第一指示信息指示的第一索引值为“20”时，终端设备根据第一索引值和表11A，可以确定第一指示信息指示第二端口索引组，第二端口索引组包括的端口索引为“8”和“9”。
(2.2)方式二
第一集合所包括的多个端口索引组通过表4A或表4B示出，第二集合所包括的多个端口索引组通过第一端口集合中的多个端口索引组所包括的端口索引和偏移量得到。
当第二指示信息指示“type1”时，终端设备可以确定需要查询的表格为表4A(此处是以表4A为例，表4B可以参照处理)。当第一指示信息指示的第一索引值为“2”时，终端设备根据第一索引值和表4A，可以确定第一指示信息指示第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。
当第二指示信息指示“type1-E”，第一指示信息指示的第一索引值为“2”，终端设备根据第一索引值可以确定第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。进一步地，由于第二指示信息指示的是第二集合中的第二端口索引组，因此，终端设备根据第一端口索引组中的端口索引“0”和“1”与偏移量(取值为8)，得到第二端口索引组的端口索引为“8”和“9”。
情形2：第二指示信息指示“type2”或“type2-E”。
当第二指示信息指示第一值，例如第二指示信息指示“type2”，终端设备根据第二指示信息可以确定第一指示信息指示第一集合中的第一端口索引组。当第二指示信息指示第二值，例如第二指示信息指示“type2-E”，终端设备根据第二指示信息可以确定第一指示信息指示第二集合中的第二端口索引组。
(1)DMRS端口占用的最大符号长度为1
当DMRS端口占用的最大符号长度为1时，以第一指示信息指示的第一索引值为“2”为例，若第二指示信息指示“type2”，则终端设备根据第二指示信息可以确定第一指示信 息指示第一集合中的第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”；若第二指示信息指示“type2-E”，则终端设备根据第二指示信息可以确定第一指示信息指示第二集合中的第二端口索引组，第二端口索引组包括的端口索引为“6”和“7”。
其中，终端设备可以通过多种方式确定第一指示信息所指示的端口索引组，比如方式一和方式二。
(1.1)方式一
第一集合所包括的多个端口索引组通过表5A示出，第二集合所包括的多个端口索引组通过表12A示出；或者，第一集合所包括的多个端口索引组通过表5B示出，第二集合所包括的多个端口索引组通过表12B示出。
当第二指示信息指示“type2”，终端设备可以确定需要查询的表格为表5A(此处是以表5A为例，表5B可以参照处理)。当第一指示信息指示的第一索引值为“2”时，终端设备根据第一索引值和表5A，可以确定第一指示信息指示第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。
当第二指示信息指示“type2-E”，终端设备可以确定需要查询的表格，比如需要查询的表格为12A(此处是以表12A为例，表12B可以参照处理)。当第一指示信息指示的第一索引值为“2”时，终端设备根据第一索引值和表12A，可以确定第一指示信息指示第二端口索引组，第二端口索引组包括的端口索引为“6”和“7”。
(1.2)方式二
第一集合所包括的多个端口索引组通过表5A或表5B示出，第二集合所包括的多个端口索引组通过第一端口集合中的多个端口索引组所包括的端口索引和偏移量得到。
当第二指示信息指示“type2”时，终端设备可以确定需要查询的表格为表5A(此处是以表5A为例，表5B可以参照处理)。当第一指示信息指示的第一索引值为“2”时，终端设备根据第一索引值和表5A，可以确定第一指示信息指示第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。
当第二指示信息指示“type2-E”，第一指示信息指示的第一索引值为“2”，终端设备根据第一索引值可以确定第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。进一步地，由于第二指示信息指示的是第二集合中的第二端口索引组，因此，终端设备根据第一端口索引组中的端口索引“0”和“1”与偏移量(取值为6)，得到第二端口索引组的端口索引为“6”和“7”。
(2)DMRS端口占用的最大符号长度为2
当DMRS端口占用的最大符号长度为2时，以第一索引值为“36”为例，若第二指示信息指示“type2”，则终端设备根据第二指示信息可以确定第一指示信息指示第一集合中的第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”；若第二指示信息指示“type2-E”，则终端设备根据第二指示信息可以确定第一指示信息指示第二集合中的第二端口索引组，第二端口索引组包括的端口索引为“12”和“13”。
其中，终端设备可以通过多种方式确定第一指示信息所指示的端口索引组，比如方式一和方式二。
(2.1)方式一
第一集合所包括的多个端口索引组通过表6A示出，第二集合所包括的多个端口索引组通过表13A示出；或者，第一集合所包括的多个端口索引组通过表6B示出，第二集合 所包括的多个端口索引组通过表13B示出。
当第二指示信息指示“type2”，终端设备可以确定需要查询的表格，比如需要查询的表格为表6A。当第一指示信息指示的第一索引值为“36”时，终端设备根据第一索引值和表6A，可以确定第一指示信息指示第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。
当第二指示信息指示“type2-E”，终端设备可以确定需要查询的表格，比如需要查询的表格为13A。当第一指示信息指示的第一索引值为“36”时，终端设备根据第一索引值和表13A，可以确定第一指示信息指示第二端口索引组，第二端口索引组包括的端口索引为“12”和“13”。
其中，终端设备确定需要查询的表格的具体实现可以有多种，比如终端设备可以根据配置类型、DMRS端口占用的符号长度以及其它可能的信息确定需要查询的表格。
(2.2)方式二
第一集合所包括的多个端口索引组通过表6A或表6B示出，第二集合所包括的多个端口索引组通过第一端口集合中的多个端口索引组所包括的端口索引和偏移量得到。
当第二指示信息指示“type2”，终端设备可以确定需要查询的表格，比如需要查询的表格为表6A。当第一指示信息指示的第一索引值为“36”时，终端设备根据第一索引值和表6A，可以确定第一指示信息指示第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。
当第二指示信息指示“type2-E”，第一指示信息指示的第一索引值为“36”，终端设备根据第一索引值可以确定第一端口索引组，第一端口索引组包括的端口索引为“0”和“1”。进一步地，由于第二指示信息指示的是第二集合中的第二端口索引组，因此，终端设备根据第一端口索引组中的端口索引“0”和“1”与偏移量(取值为12)，得到第二端口索引组的端口索引为“12”和“13”。
可以理解的是，上述两种情形是以第一端口索引组和第二端口索引组之间具有的关联关系为第一关联关系为例进行描述的，当第一端口索引组和第二端口索引组之间具有的关联关系为第二关联关系时，可以参照处理。
根据上述描述可以看出，本申请实施例提供的DMRS端口指示方法，通过建立第一端口索引组和第二端口索引组之间的关联关系，针对于第二指示信息所指示的不同值，对第一指示信息所指示的DMRS端口索引组有不同的解读，从而在扩充DMRS端口后，能够实现在指示为终端设备分配的DMRS端口的同时，有效降低指示开销。
进一步地，当第一端口索引组和第二端口索引组之间的关联关系为第一关联关系时，第一端口索引组中的端口索引可以均为现有DMRS端口索引，第二端口索引组中的端口索引可以均为新增DMRS端口索引，从而使得接入网设备为终端设备分配的DMRS端口不会同时包括现有DMRS端口和新增DMRS端口，便于更好地保证信道估计的性能。具体 解释如下：
通常情况下，在扩充DMRS端口后，接入网设备为终端设备分配的DMRS端口可以全部是现有端口，或者也可以全部是新增端口，又或者也可以是一部分为现有端口，另一部分为新增端口。以配置类型1、双符号DMRS为例，接入网设备为终端设备分配的DMRS端口索引可以包括0,1,2,3,4,5,6,7中的至少一个，或者也可以包括8,9,10,11,12,13,14,15中的至少一个，又或者也可以包括0,1,2,3,4,5,6,7中的至少一个和8,9,10,11,12,13,14,15中的 至少一个。如前文的表4A所示，8个DMRS端口索引(即0～7)对应19个DMRS端口索引组，而引入新增DMRS端口后，16个DMRS端口索引(即0～16)将会对应更多个DMRS端口索引组。因此，在引入新增DMRS端口后，如果沿用前文图3所描述的DMRS端口指示方法，则需要在表3A至表6B中添加其它可能的多个DMRS端口索引组，从而会导致实现较为复杂。比如，当在表3A至表6B中添加其它可能的多个DMRS端口索引组后，索引值也会相应增加(索引值的取值会比较大)，从而导致接入网设备需要通过更多个比特来向终端设备指示索引值，信令开销较大。
针对这一问题，经分析发现：
现有DMRS端口(比如DMRS端口0、DMRS端口1、DMRS端口4、DMRS端口5)和新增DMRS端口(比如DMRS端口8、DMRS端口9、DMRS端口12、DMRS端口13)对应的DMRS符号映射在相同的时频资源。对于现有DMRS端口，通过(w1,w2,w3,w4)保证4个DMRS端口的正交性。对于新增DMRS端口，通过(c1,c2,c3,c4)保证4个DMRS端口的正交性。因此，接入网设备在现有DMRS端口中为终端设备分配一个或多个DMRS端口与在新增DMRS端口中为终端设备分配一个或多个DMRS端口具有相同的信道估计效果。
此外，由于现有DMRS端口中的任意2个现有DMRS端口之间的正交性通过内层掩码序列保证，因此，需要内层掩码序列映射的2个子载波对应的信道相同，方可保证任意2个现有DMRS端口之间的正交性。同样地，新增DMRS端口中的任意两个DMRS端口之间的正交性通过内层掩码序列保证，因此，需要内层掩码序列映射的2个子载波对应的信道相同，方可保证任意2个新增DMRS端口之间的正交性。而对于现有DMRS端口和新增DMRS端口来说，由于它们之间的正交性需要进一步通过外层掩码序列保证，因此，需要相邻的2组内层掩码序列映射的4个子载波(比如子载波0、子载波2、子载波4和子载波6)对应的信道相同，方可保证现有DMRS端口和新增DMRS端口之间的正交性。
但是，随着信道时延扩展或最大时延的增加，信道频率选择性衰落更加显著，信道相干带宽进一步减小，从而导致4个子载波对应的信道相同的难度比2个子载波对应的信道相同的难度要大。因此，接入网设备为终端设备分配的DMRS端口全部是现有DMRS端口或者全部是新增DMRS端口，相比于接入网设备为终端设备分配的DMRS端口部分是现有DMRS端口，部分是新增DMRS端口来说，具有更好的性能表现。
基于上述分析，对于一个终端设备，当接入网设备从现有DMRS端口中为终端设备分配至少一个DMRS端口或者从新增DMRS端口中为终端设备分配至少一个DMRS端口，而不同时为终端设备分配现有DMRS端口和新增DMRS端口时，能够更好地保证信道估计的性能，还可以有效降低实现复杂度。
接入网设备通过上述S601和S602中的方法向终端设备指示为终端设备分配的DMRS端口后，终端设备可以在DMRS端口对应的时频资源上向接入网设备发送DMRS(即上行传输)，或者也可以在DMRS端口对应的时频资源上接收来自接入网设备的DMRS(即下行传输)。其中，终端设备执行上行传输还是下行传输可以由接入网设备通过其它可能的信息来指示，本申请实施例对此不做限定。
可选地，当终端设备在DMRS端口对应的时频资源上接收来自接入网设备的DMRS时，上述方法还可以包括：
S603，接入网设备向终端设备发送第三指示信息；相应地，终端设备接收第三指示信息。
示例性地，第三指示信息可以承载于MAC CE或DCI。第三指示信息与前文所述的第一指示信息和/或第二指示信息可以承载于同一消息(比如同一MAC CE或DCI)，或者也可以承载于不同消息，具体不做限定。也就是说，接入网设备可以分别通过三条消息向终端设备发送第一指示信息、第二指示信息和第三指示信息；或者，接入网设备也可以通过两条消息向终端设备发送第一指示信息、第二指示信息和第三指示信息，此种情形下，第一指示信息、第二指示信息和第三指示信息中的任意两个指示信息可以承载于同一消息；又或者，接入网设备也可以通过一条消息向终端设备发送第一指示信息、第二指示信息和第三指示信息。
下面将分别针对第一关联关系和第二关联关系，对第三指示信息进行描述。
(1)第一端口索引组和第二端口索引组之间的关联关系为第一关联关系
若第一端口索引组和第二端口索引组之间的关联关系为第一关联关系，则可以有如下两种可能的实现。
第一种实现：当第一指示信息指示第一端口索引组时，第三指示信息可以指示在为终端设备分配的时频资源上，是否将第二集合中的端口索引组分配给其它终端设备；或者，当第一指示信息指示第二端口索引组时，第三指示信息可以指示在为终端设备分配的时频资源上，是否将第一集合中的端口索引组分配给其它终端设备。
以第一指示信息指示第一端口索引组的情形为例，当第三指示信息指示将第二集合中的端口索引组分配给了其它终端设备时，表示接入网设备将第二集合中的一个端口索引组分配给了其它一个终端设备，或者接入网设备将第二集合中的多个端口索引组分别分配给了其它多个终端设备。也就是说，接入网设备只要将第二集合中的任一端口索引组分配给了其它终端设备，便可以向终端设备发送第三指示信息。
可以理解的是，“第三指示信息指示在为终端设备分配的时频资源上，是否将第二集合中的端口索引组分配给其它终端设备”可以替换为其它可能的描述。比如可以替换为“第三指示信息指示在为在同一次传输或调度中，是否将第二集合中的端口索引组分配给其它终端设备”，又比如可以替换为“第三指示信息指示为终端设备分配的DMRS端口对应的频域掩码序列长度为2或4”。其它类似的描述可以参照处理。
第二种实现：当第一指示信息指示第一端口索引组时，第三指示信息可以指示在为终端设备分配的时频资源上，是否将第二端口索引组分配给其它终端设备；或者，当第一指示信息指示第二端口索引组时，第三指示信息可以指示在为终端设备分配的时频资源上，是否将第一端口索引组分配给其它终端设备。
以第一指示信息指示第一端口索引组的情形为例，也就是说，接入网设备在将第二集合中的第二端口索引组分配给了其它终端设备时，可以向终端设备发送第三指示信息；而在将第二集合中除第二端口索引组以外的其它端口索引组分配给了其它终端设备时，可以不向终端设备发送第三指示信息。
针对于上述第一种实现，下面分别从接入网设备和终端设备侧进行详细描述。
从接入网设备的角度来看：
当接入网设备为终端设备分配了第一端口索引组，且未将第二集合中的端口索引组分配给其它终端设备时，接入网设备可以向终端设备发送第三指示信息，第三指示信息指示 未将第二集合中的端口索引组分配给其它终端设备。
当接入网设备为终端设备分配了第一端口索引组，以及将第二集合中的端口索引组分配给了其它终端设备时，接入网设备可以执行操作1和/或操作2。其中，接入网设备执行操作1可以是指：接入网设备向终端设备发送第三指示信息，第三指示信息指示将第二集合中的端口索引组分配给了其它终端设备。接入网设备执行操作2可以是指：接入网设备基于配对终端设备(比如终端设备和其它终端设备)的信道信息，通过迫零预编码来消除配对终端设备之间的干扰。
其中，当多个终端设备调度的时域资源(比如时隙)相同、频域资源(比如物理资源块(physical resource block，PRB))全部或部分相同，但接入网设备为多个终端设备分配的DMRS端口(比如多个终端设备包括两个终端设备，接入网设备为其中一个终端设备分配的是现有DMRS端口，为另一个终端设备分别的是新增DMRS端口)不同时，多个终端设备可以称为一组配对终端设备。
从终端设备的角度来看：
终端设备可以通过上述方式确定接入网设备为终端设备分配的端口索引，比如接入网设备为终端设备分配的是第一集合中的第一端口索引组，第一集合为前文所述的集合3，第一端口索引组包括的端口索引为DMRS端口索引“0”。
若第三指示信息指示未将第二集合中的端口索引组分配给其它终端设备，则不会产生新增DMRS端口对现有DMRS端口的干扰，因此，即使不考虑外层掩码，接入网设备为终端设备分配的DMRS端口也是正交的。进而，终端设备在根据DMRS端口0对应的DMRS进行信道估计时，可以无需考虑外层掩码的影响；或者说，终端设备在根据DMRS端口0对应的DMRS进行信道估计时，可以按照频域掩码长度为2的粒度进行信道估计；又或者说，终端设备在根据DMRS端口0对应的DMRS进行信道估计时，仅需要考虑内层掩码的解扩。
若第三指示信息指示将第二集合中的DMRS端口索引组分配给了其它终端设备，在仅考虑内层掩码的情况下，会产生新增DMRS端口对现有DMRS端口的干扰，进而终端设备在根据DMRS端口0对应的DMRS进行信道估计时，需要考虑外层掩码的影响，以便降低新增DMRS端口对现有DMRS端口的干扰；或者说，终端设备在根据DMRS端口0对应的DMRS进行信道估计时，需要按照频域掩码长度为4的粒度进行信道估计；又或者说，终端设备在根据DMRS端口0对应的DMRS进行信道估计时，需要考虑内层掩码和外层掩码的解扩。
可以理解的是，上述从接入网设备和终端设备的描述仅为一种可能的示例，本申请实施例的其它情形可以参照该示例。比如，在一些可能的场景(比如第二端口索引组会对第一端口索引组产生干扰，而第二集合中除第二端口索引组以外的其它端口索引组不会对第一端口索引组产生干扰或者产生的干扰相对较小)中，上述示例中的“未将第二集合中的端口索引组分配给其它终端设备”可以替换为“未将第二端口索引组分配给其它终端设备”，“将第二集合中的端口索引组分配给了其它终端设备”可以替换为“将第二端口索引组分配给了其它终端设备”。
(2)第一端口索引组和第二端口索引组之间的关联关系为第二关联关系
若第一端口索引组和第二端口索引组之间的关联关系为第二关联关系，则当第一指示信息指示第一端口索引组时，第三指示信息可以指示在为终端设备分配的时频资源上，是 否将第二集合中的端口索引组分配给其它终端设备；或者，当第一指示信息指示第二端口索引组时，第三指示信息可以指示在为终端设备分配的时频资源上，是否将第一集合中的端口索引组分配给其它终端设备。
以第一指示信息指示第一端口索引组的情形为例，也就是说，接入网设备只要将第二集合中的任一端口索引组分配给了其它终端设备，便可以向终端设备发送第三指示信息。
可以理解的是，当第一端口索引组和第二端口索引组之间的关联关系为第二关联关系时，若第一指示信息指示第一端口索引组，第一端口索引组中的DMRS端口索引均为现有DMRS端口索引(比如第一端口索引组为表3A至表6B中所示意的某一个端口索引组)，此种情形下，接入网设备可以向终端设备发送第三指示信息，以指示是否将第二集合中的端口索引组分配给其它终端设备，具体实现可以参照上文的描述。若接入网设备为终端设备分配的是第二端口索引组，由于第二端口索引组中的DMRS端口索引包括现有DMRS端口索引和新增DMRS端口索引(比如第二端口索引组为表14A和表14B中所示意的某一个端口索引组)，此种情形下，终端设备根据分配的DMRS端口索引，便可以确定在进行信道估计时，需要考虑外层掩码的影响，以便降低新增DMRS端口和现有DMRS端口之间的干扰；因此，接入网设备可以无需向终端设备发送第三指示信息，便于节省信令开销。
此外，S603为可选步骤，也就是说，接入网设备可以不向终端设备发送第三指示信息，此种情形下，终端设备可以默认按照频域掩码长度为4的粒度进行信道估计。
采用上述方法，由于接入网设备可以向终端设备发送第三指示信息，从而使得终端设备可以根据第三指示信息，采用相应的方式进行信道估计。比如，终端设备根据第三指示信息，可以在信道估计时不考虑外层掩码的解扩，从而使得信道估计的实现更为简便；又比如，终端设备根据第三指示信息，可以在信道估计时考虑内层掩码和外层掩码的解扩，从而便于降低现有DMRS端口和新增DMRS端口之间的干扰。
上述主要从通信装置交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，为了实现上述功能，接入网设备和终端设备可以包括执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请的实施例能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对接入网设备和终端设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
在采用集成的单元的情况下，图7示出了本申请实施例中所涉及的装置的可能的示例性框图。如图7所示，装置700可以包括：处理单元702和通信单元703。处理单元702用于对装置700的动作进行控制管理。通信单元703用于支持装置700与其他设备的通信。可选地，通信单元703也称为收发单元，可以包括接收单元和/或发送单元，分别用于执行接收和发送操作。装置700还可以包括存储单元701，用于存储装置700的程序代码和/或 数据。
该装置700可以为上述实施例中的接入网设备。处理单元702可以支持装置700执行上文中各方法示例中接入网设备的动作。或者，处理单元702主要执行方法示例中接入网设备的内部动作，通信单元703可以支持装置700与其它设备之间的通信。
比如，在一个实施例中，通信单元703用于：向终端设备发送第一指示信息，以及向所述终端设备发送第二指示信息；当所述第二指示信息指示第一值时，所述第一指示信息指示第一集合所包括的多个端口索引组中的第一端口索引组；当所述第二指示信息指示第二值时，所述第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；所述第一端口索引组和所述第二端口索引组具有关联关系。
该装置700可以为上述实施例中的终端设备。处理单元702可以支持装置700执行上文中各方法示例中终端设备的动作。或者，处理单元702主要执行方法示例中终端设备的内部动作，通信单元703可以支持装置700与其它设备之间的通信。
比如，在一个实施例中，通信单元703用于：接收来自接入网设备的第一指示信息，以及接收来自所述接入网设备的第二指示信息；当所述第二指示信息指示第一值时，所述第一指示信息指示第一集合所包括的多个端口索引组中的第一端口索引组；当所述第二指示信息指示第二值时，所述第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；所述第一端口索引组和所述第二端口索引组具有关联关系。
应理解以上装置中单元的划分仅仅是一种逻辑功能的划分，实际实现时可以全部或部分集成到一个物理实体上，也可以物理上分开。且装置中的单元可以全部以软件通过处理元件调用的形式实现；也可以全部以硬件的形式实现；还可以部分单元以软件通过处理元件调用的形式实现，部分单元以硬件的形式实现。例如，各个单元可以为单独设立的处理元件，也可以集成在装置的某一个芯片中实现，此外，也可以以程序的形式存储于存储器中，由装置的某一个处理元件调用并执行该单元的功能。此外这些单元全部或部分可以集成在一起，也可以独立实现。这里所述的处理元件又可以成为处理器，可以是一种具有信号的处理能力的集成电路。在实现过程中，上述方法的各操作或以上各个单元可以通过处理器元件中的硬件的集成逻辑电路实现或者以软件通过处理元件调用的形式实现。
在一个例子中，以上任一装置中的单元可以是被配置成实施以上方法的一个或多个集成电路，例如：一个或多个特定集成电路(application specific integrated circuit，ASIC)，或，一个或多个微处理器(digital singnal processor，DSP)，或，一个或者多个现场可编程门阵列(field programmable gate array，FPGA)，或这些集成电路形式中至少两种的组合。再如，当装置中的单元可以通过处理元件调度程序的形式实现时，该处理元件可以是处理器，比如通用中央处理器(central processing unit，CPU)，或其它可以调用程序的处理器。再如，这些单元可以集成在一起，以片上系统(system-on-a-chip，SOC)的形式实现。
以上用于接收的单元是一种该装置的接口电路，用于从其它装置接收信号。例如，当该装置以芯片的方式实现时，该接收单元是该芯片用于从其它芯片或装置接收信号的接口电路。以上用于发送的单元是一种该装置的接口电路，用于向其它装置发送信号。例如，当该装置以芯片的方式实现时，该发送单元是该芯片用于向其它芯片或装置发送信号的接口电路。
参见图8，为本申请实施例提供的一种接入网设备的结构示意图，该接入网设备(或 基站)可应用于如图1所示的通信系统中，执行上述方法实施例中接入网设备的功能。如图8所示，接入网设备80可包括一个或多个DU 801和一个或多个CU 802。所述DU 801可以包括至少一个天线8011，至少一个射频单元8012，至少一个处理器8013和至少一个存储器8014。所述DU 801部分主要用于射频信号的收发以及射频信号与基带信号的转换，以及部分基带处理。CU802可以包括至少一个处理器8022和至少一个存储器8021。
所述CU 802部分主要用于进行基带处理，对接入网设备进行控制等。所述DU 801与CU 802可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。所述CU 802为接入网设备的控制中心，也可以称为处理单元，主要用于完成基带处理功能。例如所述CU 802可以用于控制接入网设备执行上述方法实施例中关于接入网设备的操作流程。
此外，可选的，接入网设备80可以包括一个或多个射频单元，一个或多个DU和一个或多个CU。其中，DU可以包括至少一个处理器8013和至少一个存储器8014，射频单元可以包括至少一个天线8011和至少一个射频单元8012，CU可以包括至少一个处理器8022和至少一个存储器8021。
在一个实例中，所述CU802可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如5G网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述存储器8021和处理器8022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。所述DU801可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如5G网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述存储器8014和处理器8013可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
图8所示的接入网设备能够实现上述方法实施例中涉及接入网设备的各个过程。图8所示的接入网设备中的各个模块的操作和/或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详述描述。
参见图9，为本申请实施例提供的一种终端设备的结构示意图，该终端设备可应用于如图1所示的通信系统中，用于实现以上实施例中终端设备的操作。如图9所示，该终端设备包括：天线910、射频部分920、信号处理部分930。天线910与射频部分920连接。在下行方向上，射频部分920通过天线910接收网络设备(比如接入网设备)发送的信息，将网络设备发送的信息发送给信号处理部分930进行处理。在上行方向上，信号处理部分930对终端设备的信息进行处理，并发送给射频部分920，射频部分920对终端设备的信息进行处理后经过天线910发送给网络设备。
信号处理部分930可以包括调制解调子系统，用于实现对数据各通信协议层的处理；还可以包括中央处理子系统，用于实现对终端设备操作系统以及应用层的处理；此外，还可以包括其它子系统，例如多媒体子系统，周边子系统等，其中多媒体子系统用于实现对终端设备相机，屏幕显示等的控制，周边子系统用于实现与其它设备的连接。调制解调子系统可以为单独设置的芯片。
调制解调子系统可以包括一个或多个处理元件931，例如，包括一个主控CPU和其它集成电路。此外，该调制解调子系统还可以包括存储元件932和接口电路933。存储元件 932用于存储数据和程序，但用于执行以上方法中终端设备所执行的方法的程序可能不存储于该存储元件932中，而是存储于调制解调子系统之外的存储器中，使用时调制解调子系统加载使用。接口电路933用于与其它子系统通信。
该调制解调子系统可以通过芯片实现，该芯片包括至少一个处理元件和接口电路，其中处理元件用于执行以上终端设备执行的任一种方法的各个步骤，接口电路用于与其它装置通信。在一种实现中，终端设备实现以上方法中各个步骤的单元可以通过处理元件调度程序的形式实现，例如用于终端设备的装置包括处理元件和存储元件，处理元件调用存储元件存储的程序，以执行以上方法实施例中终端设备执行的方法。存储元件可以为与处理元件处于同一芯片上的存储元件，即片内存储元件。
在另一种实现中，用于执行以上方法中终端设备所执行的方法的程序可以在与处理元件处于不同芯片上的存储元件，即片外存储元件。此时，处理元件从片外存储元件调用或加载程序于片内存储元件上，以调用并执行以上方法实施例中终端设备执行的方法。
在又一种实现中，终端设备实现以上方法中各个步骤的单元可以是被配置成一个或多个处理元件，这些处理元件设置于调制解调子系统上，这里的处理元件可以为集成电路，例如：一个或多个ASIC，或，一个或多个DSP，或，一个或者多个FPGA，或者这些类集成电路的组合。这些集成电路可以集成在一起，构成芯片。
终端设备实现以上方法中各个步骤的单元可以集成在一起，以SOC的形式实现，该SOC芯片，用于实现以上方法。该芯片内可以集成至少一个处理元件和存储元件，由处理元件调用存储元件的存储的程序的形式实现以上终端设备执行的方法；或者，该芯片内可以集成至少一个集成电路，用于实现以上终端设备执行的方法；或者，可以结合以上实现方式，部分单元的功能通过处理元件调用程序的形式实现，部分单元的功能通过集成电路的形式实现。
可见，以上用于终端设备的装置可以包括至少一个处理元件和接口电路，其中至少一个处理元件用于执行以上方法实施例所提供的任一种终端设备执行的方法。处理元件可以以第一种方式：即调用存储元件存储的程序的方式执行终端设备执行的部分或全部步骤；也可以以第二种方式：即通过处理器元件中的硬件的集成逻辑电路结合指令的方式执行终端设备执行的部分或全部步骤；当然，也可以结合第一种方式和第二种方式执行终端设备执行的部分或全部步骤。
这里的处理元件同以上描述，可以通过处理器实现，处理元件的功能可以和图7中所描述的处理单元的功能相同。示例性地，处理元件可以是通用处理器，例如CPU，还可以是被配置成实施以上方法的一个或多个集成电路，例如：一个或多个ASIC，或，一个或多个微处理器DSP，或，一个或者多个FPGA等，或这些集成电路形式中至少两种的组合。存储元件可以通过存储器实现，存储元件的功能可以和图7中所描述的存储单元的功能相同。存储元件可以是一个存储器，也可以是多个存储器的统称。
图9所示的终端设备能够实现上述方法实施例中涉及终端设备的各个过程。图9所示的终端设备中的各个模块的操作和/或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详述描述。
本申请实施例中的术语“系统”和“网络”可被互换使用。“至少一种”是指一种或者多种，“多个”是指两个或两个以上。“和/或”，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 的情况，其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“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和C中的至少一个”包括A，B，C，AB，AC，BC或ABC。以及，除非有特别说明，本申请实施例提及“第一”、“第二”等序数词是用于对多个对象进行区分，不用于限定多个对象的顺序、时序、优先级或者重要程度。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (59)

  1. 一种通信方法，其特征在于，所述方法包括：
    向终端设备发送第一指示信息；
    向所述终端设备发送第二指示信息；
    当所述第二指示信息指示第一值时，所述第一指示信息指示第一集合所包括的多个端口索引组中的第一端口索引组；
    当所述第二指示信息指示第二值时，所述第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；
    所述第一端口索引组和所述第二端口索引组具有关联关系。
  2. 根据权利要求1所述的方法，其特征在于，所述关联关系为：
    所述第一端口索引组中的端口索引和所述第二端口索引组中的端口索引一一对应。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
  4. 根据权利要求3所述的方法，其特征在于，所述第一集合对应多个端口索引，对于所述第一集合所包括的多个端口索引组中的每个端口索引组，所述每个端口索引组包括所述多个端口索引中的至少一个端口索引；
    所述偏移量等于所述第一集合对应的端口索引的个数。
  5. 根据权利要求3或4所述的方法，其特征在于，所述偏移量的取值为4，8，6或12。
  6. 根据权利要求1所述的方法，其特征在于，所述关联关系为：
    所述第一端口索引组为所述第二端口索引组的子集。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述第二指示信息承载于无线资源控制RRC消息或下行控制信息DCI。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，所述第一指示信息指示第一索引值；
    所述第一索引值关联所述第一端口索引组和所述第二端口索引组。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，所述第一端口索引组和所述第二端口索引组对应的时频资源相同；
    所述第一端口索引组对应第一掩码序列，所述第二端口索引组对应第二掩码序列，所述第一掩码序列和所述第二掩码序列正交。
  10. 根据权利要求1至9中任一项所述的方法，其特征在于，所述方法还包括：
    向所述终端设备发送第三指示信息；
    当所述第一指示信息指示所述第一端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第二端口索引组分配给其它终端设备；或者，
    当所述第一指示信息指示所述第二端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第一端口索引组分配给其它终端设备。
  11. 一种通信方法，其特征在于，所述方法包括：
    接收来自接入网设备的第一指示信息；
    接收来自所述接入网设备的第二指示信息；
    当所述第二指示信息指示第一值时，所述第一指示信息指示第一集合所包括的多个端 口索引组中的第一端口索引组；
    当所述第二指示信息指示第二值时，所述第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；
    所述第一端口索引组和所述第二端口索引组具有关联关系。
  12. 根据权利要求11所述的方法，其特征在于，所述关联关系为：
    所述第一端口索引组中的端口索引和所述第二端口索引组中的端口索引一一对应。
  13. 根据权利要求11或12所述的方法，其特征在于，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
  14. 根据权利要求13所述的方法，其特征在于，所述第一集合对应多个端口索引，对于所述第一集合所包括的多个端口索引组中的每个端口索引组，所述每个端口索引组包括所述多个端口索引中的至少一个端口索引；
    所述偏移量等于所述第一集合对应的端口索引的个数。
  15. 根据权利要求13或14所述的方法，其特征在于，所述偏移量的取值为4，8，6或12。
  16. 根据权利要求11所述的方法，其特征在于，所述关联关系为：
    所述第一端口索引组为所述第二端口索引组的子集。
  17. 根据权利要求11至16中任一项所述的方法，其特征在于，所述第二指示信息承载于RRC消息或DCI。
  18. 根据权利要求11至17中任一项所述的方法，其特征在于，所述第一指示信息指示第一索引值；
    所述第一索引值关联所述第一端口索引组和所述第二端口索引组。
  19. 根据权利要求11至18中任一项所述的方法，其特征在于，所述第一端口索引组和所述第二端口索引组对应的时频资源相同；
    所述第一端口索引组对应第一掩码序列，所述第二端口索引组对应第二掩码序列，所述第一掩码序列和所述第二掩码序列正交。
  20. 根据权利要求11至19中任一项所述的方法，其特征在于，所述方法还包括：
    接收来自所述接入网设备的第三指示信息；
    当所述第一指示信息指示所述第一端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第二端口索引组分配给其它终端设备；或者，
    当所述第一指示信息指示所述第二端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第一端口索引组分配给其它终端设备。
  21. 一种通信装置，其特征在于，所述装置包括：
    通信单元，用于向终端设备发送第一指示信息；
    所述通信单元，还用于向所述终端设备发送第二指示信息；
    当所述第二指示信息指示第一值时，所述第一指示信息指示第一集合所包括的多个端口索引组中的第一端口索引组；
    当所述第二指示信息指示第二值时，所述第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；
    所述第一端口索引组和所述第二端口索引组具有关联关系。
  22. 根据权利要求21所述的装置，其特征在于，所述关联关系为：
    所述第一端口索引组中的端口索引和所述第二端口索引组中的端口索引一一对应。
  23. 根据权利要求21或22所述的装置，其特征在于，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
  24. 根据权利要求23所述的装置，其特征在于，所述第一集合对应多个端口索引，对于所述第一集合所包括的多个端口索引组中的每个端口索引组，所述每个端口索引组包括所述多个端口索引中的至少一个端口索引；
    所述偏移量等于所述第一集合对应的端口索引的个数。
  25. 根据权利要求23或24所述的装置，其特征在于，所述偏移量的取值为4，8，6或12。
  26. 根据权利要求21所述的装置，其特征在于，所述关联关系为：
    所述第一端口索引组为所述第二端口索引组的子集。
  27. 根据权利要求21至26中任一项所述的装置，其特征在于，所述第二指示信息承载于无线资源控制RRC消息或下行控制信息DCI。
  28. 根据权利要求21至27中任一项所述的装置，其特征在于，所述第一指示信息指示第一索引值；
    所述第一索引值关联所述第一端口索引组和所述第二端口索引组。
  29. 根据权利要求21至28中任一项所述的装置，其特征在于，所述第一端口索引组和所述第二端口索引组对应的时频资源相同；
    所述第一端口索引组对应第一掩码序列，所述第二端口索引组对应第二掩码序列，所述第一掩码序列和所述第二掩码序列正交。
  30. 根据权利要求21至29中任一项所述的装置，其特征在于，所述通信单元还用于：
    向所述终端设备发送第三指示信息；
    当所述第一指示信息指示所述第一端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第二端口索引组分配给其它终端设备；或者，
    当所述第一指示信息指示所述第二端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第一端口索引组分配给其它终端设备。
  31. 一种通信装置，其特征在于，所述装置包括：
    通信单元，用于接收来自接入网设备的第一指示信息；
    所述通信单元，还用于接收来自所述接入网设备的第二指示信息；
    当所述第二指示信息指示第一值时，所述第一指示信息指示第一集合所包括的多个端口索引组中的第一端口索引组；
    当所述第二指示信息指示第二值时，所述第一指示信息指示第二集合所包括的多个端口索引组中的第二端口索引组；
    所述第一端口索引组和所述第二端口索引组具有关联关系。
  32. 根据权利要求31所述的装置，其特征在于，所述关联关系为：
    所述第一端口索引组中的端口索引和所述第二端口索引组中的端口索引一一对应。
  33. 根据权利要求31或32所述的装置，其特征在于，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
  34. 根据权利要求33所述的装置，其特征在于，所述第一集合对应多个端口索引，对于所述第一集合所包括的多个端口索引组中的每个端口索引组，所述每个端口索引组包括 所述多个端口索引中的至少一个端口索引；
    所述偏移量等于所述第一集合对应的端口索引的个数。
  35. 根据权利要求33或34所述的装置，其特征在于，所述偏移量的取值为4，8，6或12。
  36. 根据权利要求31所述的装置，其特征在于，所述关联关系为：
    所述第一端口索引组为所述第二端口索引组的子集。
  37. 根据权利要求31至36中任一项所述的装置，其特征在于，所述第二指示信息承载于RRC消息或DCI。
  38. 根据权利要求31至37中任一项所述的装置，其特征在于，所述第一指示信息指示第一索引值；
    所述第一索引值关联所述第一端口索引组和所述第二端口索引组。
  39. 根据权利要求31至38中任一项所述的装置，其特征在于，所述第一端口索引组和所述第二端口索引组对应的时频资源相同；
    所述第一端口索引组对应第一掩码序列，所述第二端口索引组对应第二掩码序列，所述第一掩码序列和所述第二掩码序列正交。
  40. 根据权利要求31至39中任一项所述的装置，其特征在于，所述通信单元还用于：
    接收来自所述接入网设备的第三指示信息；
    当所述第一指示信息指示所述第一端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第二端口索引组分配给其它终端设备；或者，
    当所述第一指示信息指示所述第二端口索引组时，所述第三指示信息指示在为所述终端设备分配的时频资源上，是否将所述第一端口索引组分配给其它终端设备。
  41. 一种通信方法，其特征在于，所述方法包括：
    向终端设备发送第一指示信息，所述第一指示信息指示DMRS的配置类型；
    向所述终端设备发送第二指示信息，所述第二指示信息指示索引值，所述索引值为第一集合所包括的端口索引组的索引值，或者所述索引值为第二集合所包括的端口索引组的索引值。
  42. 根据权利要求41所述的方法，其特征在于，所述第一集合包括第一端口索引组，所述第二集合包括第二端口索引组，所述第一端口索引组与所述第二端口索引组具有关联关系。
  43. 根据权利要求42所述的方法，其特征在于，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
  44. 根据权利要求43所述的方法，其特征在于，所述偏移量的取值为4，8，6或12。
  45. 一种通信方法，其特征在于，所述方法包括：
    接收来自接入网设备的第一指示信息，所述第一指示信息指示DMRS的配置类型；
    接收来自所述接入网设备的第二指示信息，所述第二指示信息指示索引值，所述索引值为第一集合所包括的端口索引组的索引值，或者所述索引值为第二集合所包括的端口索引组的索引值。
  46. 根据权利要求45所述的方法，其特征在于，所述第一集合包括第一端口索引组，所述第二集合包括第二端口索引组，所述第一端口索引组与所述第二端口索引组具有关联关系。
  47. 根据权利要求46所述的方法，其特征在于，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
  48. 根据权利要求47所述的方法，其特征在于，所述偏移量的取值为4，8，6或12。
  49. 一种通信装置，其特征在于，所述装置包括：
    通信单元，用于向终端设备发送第一指示信息，所述第一指示信息指示DMRS的配置类型；
    所述通信单元，还用于向所述终端设备发送第二指示信息，所述第二指示信息指示索引值，所述索引值为第一集合所包括的端口索引组的索引值，或者所述索引值为第二集合所包括的端口索引组的索引值。
  50. 根据权利要求49所述的装置，其特征在于，所述第一集合包括第一端口索引组，所述第二集合包括第二端口索引组，所述第一端口索引组与所述第二端口索引组具有关联关系。
  51. 根据权利要求50所述的装置，其特征在于，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
  52. 根据权利要求51所述的装置，其特征在于，所述偏移量的取值为4，8，6或12。
  53. 一种通信装置，其特征在于，所述装置包括：
    通信单元，用于接收来自接入网设备的第一指示信息，所述第一指示信息指示DMRS的配置类型；
    接收来自所述接入网设备的第二指示信息，所述第二指示信息指示索引值，所述索引值为第一集合所包括的端口索引组的索引值，或者所述索引值为第二集合所包括的端口索引组的索引值。
  54. 根据权利要求53所述的装置，其特征在于，所述第一集合包括第一端口索引组，所述第二集合包括第二端口索引组，所述第一端口索引组与所述第二端口索引组具有关联关系。
  55. 根据权利要求54所述的装置，其特征在于，所述第一端口索引组中的端口索引与所述第二端口索引组中的端口索引之间具有偏移量。
  56. 根据权利要求55所述的装置，其特征在于，所述偏移量的取值为4，8，6或12。
  57. 一种通信装置，其特征在于，所述通信装置包括处理器和存储介质，所述存储介质存储有指令，所述指令被所述处理器运行时，使得根据权利要求1至10中任一项所述的方法被实现，或者使得根据权利要求11至20中任一项所述的方法被实现，或者使得根据权利要求41至44中任一项所述的方法被实现，或者使得根据权利要求45至48中任一项所述的方法被实现。
  58. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括指令，当所述指令被处理器运行时，使得根据权利要求1至10中任一项所述的方法被实现，或者使得根据权利要求11至20中任一项所述的方法被实现，或者使得根据权利要求41至44中任一项所述的方法被实现，或者使得根据权利要求45至48中任一项所述的方法被实现。
  59. 一种计算机程序产品，其特征在于，所述计算机程序产品包括指令，当所述指令被处理器运行时，使得根据权利要求1至10中任一项所述的方法被实现，或者使得根据权利要求11至20中任一项所述的方法被实现，或者使得根据权利要求41至44中任一项所述的方法被实现，或者使得根据权利要求45至48中任一项所述的方法被实现。
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