WO2024032351A1 - Dmrs端口指示方法、装置及存储介质 - Google Patents

Dmrs端口指示方法、装置及存储介质 Download PDF

Info

Publication number
WO2024032351A1
WO2024032351A1 PCT/CN2023/108632 CN2023108632W WO2024032351A1 WO 2024032351 A1 WO2024032351 A1 WO 2024032351A1 CN 2023108632 W CN2023108632 W CN 2023108632W WO 2024032351 A1 WO2024032351 A1 WO 2024032351A1
Authority
WO
WIPO (PCT)
Prior art keywords
dmrs
antenna port
value
antenna
port
Prior art date
Application number
PCT/CN2023/108632
Other languages
English (en)
French (fr)
Inventor
高翔
董昶钊
张哲宁
刘显达
刘鹍鹏
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2024032351A1 publication Critical patent/WO2024032351A1/zh

Links

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

Definitions

  • the present application relates to the field of communication technology, and in particular to a demodulation reference signal (DMRS) port indication method, device and storage medium.
  • DMRS demodulation reference signal
  • DMRS is used to estimate the equivalent channel matrix experienced by the data channel or control channel, thereby being used for data detection and demodulation.
  • each user can only support the transmission of a maximum of 4 streams (rank 4). How to support DMRS port indication with a maximum rank of 8 is a problem that needs to be solved.
  • the current rank 5 ⁇ 8 DMRS port indication cannot be used to indicate the above-mentioned expanded DMRS ports, and the advantages of higher density of expanded DMRS ports within limited time and frequency resources cannot be fully utilized, so there is a large problem DMRS resource overhead.
  • This application provides a DMRS port indication method, device and storage medium to achieve indication of DMRS antenna ports greater than 4 streams.
  • a first aspect provides a DMRS port indication method, which is characterized in that the method includes: obtaining the type dmrs-Type of the demodulation reference signal DMRS and the maximum time domain symbol length maxLength allowed by the preamble DMRS; determining the first relationship , wherein the first relationship has an associated relationship with the dmrs-Type and the maxLength, and the first relationship includes at least one candidate value of the antenna port field, and at least one candidate value of the antenna port field.
  • the DCI includes the antenna port field, and the antenna port field is used to indicate a value among at least one candidate value of the antenna port field in the DCI; according to a value of the indication, determine a value related to the indication. an antenna port corresponding to a value; and receiving the DMRS corresponding to the determined antenna port.
  • the candidate antenna port corresponding to each of the above candidate values may be the index of the candidate antenna port.
  • the above candidate antenna port is relative to the antenna port corresponding to a value indicated by the antenna port field in the DCI.
  • the candidate antenna port is the antenna port in the DMRS port index table, and DMRS can be sent on this antenna port. DMRS may not be sent on this antenna port.
  • the code division multiplexing groups corresponding to the first antenna port group and the second antenna port group are the same code division multiplexing groups.
  • the DMRS corresponding to the first antenna port group and the second antenna port group corresponding to the same CDM group are multiplexed in the same time-frequency resource.
  • obtaining the DMRS-Type and maxLength includes: receiving first signaling, where the first signaling includes the DMRS-Type and the maxLength.
  • the dmrs-Type and maxLength can be carried through the first signaling.
  • a DMRS port indication method includes: obtaining the type dmrs-Type of the demodulation reference signal DMRS and the maximum time domain symbol length maxLength allowed by the preamble DMRS; determining the first relationship , wherein the first relationship has an associated relationship with the dmrs-Type and the maxLength, and the first relationship includes at least one candidate value of the antenna port field, and at least one candidate value of the antenna port field.
  • the first antenna port group and the second antenna port group respectively correspond to at least two code division multiplexing groups, and the code division multiplexing groups corresponding to the first antenna port group and the second antenna port group are The number is the same, and the N is greater than 4; sending downlink control information DCI, the DCI includes the antenna port field, and the antenna port field is used to indicate one of at least one candidate value of the antenna port field in the DCI ;
  • According to a value of the indication determine an antenna port corresponding to a value of the indication; and send DMRS corresponding to the determined antenna port.
  • the method further includes: sending first signaling, where the first signaling includes the dmrs-Type and the maxLength.
  • the dmrs-Type and maxLength can be carried through the first signaling.
  • a DMRS port indication device can implement the method in the first aspect.
  • the DMRS port indicating device may be a terminal or a chip system of the terminal.
  • the above method can be implemented through software, hardware, or through hardware executing corresponding software.
  • the device includes: a transceiver unit and a processing unit; wherein: the processing unit is used to obtain the type DMRS-Type of the demodulation reference signal DMRS and the maximum time domain symbol length allowed by the preamble DMRS maxLength; the processing unit is further configured to determine a first relationship, wherein the first relationship has an associated relationship with the dmrs-Type and the maxLength, and the first relationship includes at least one candidate of the antenna port field value, and a candidate antenna port corresponding to each candidate value in at least one candidate value of the antenna port field, wherein the number of candidate antenna ports corresponding to each candidate value is greater than or equal to N, and each The candidate antenna ports corresponding to the candidate values are included in the first antenna port group and/or the second antenna port group, wherein the first antenna port group and the second antenna port group include the same number of antenna ports, so The first antenna port group and the second antenna port group respectively correspond to at least two code division multiplexing groups, and the number of code division multiplexing
  • the transceiver unit is also configured to receive first signaling, where the first signaling includes the dmrs-Type and the maxLength.
  • a DMRS port indication device can implement the method in the above second aspect.
  • the DMRS port indicating device may be a network device or a chip system in the network device.
  • the above method can be implemented through software, hardware, or through hardware executing corresponding software.
  • the device includes: a transceiver unit and a processing unit; wherein: the processing unit is used to obtain the type DMRS-Type of the demodulation reference signal DMRS and the maximum time domain symbol length allowed by the preamble DMRS maxLength; the processing unit is further configured to determine a first relationship, wherein the first relationship has an associated relationship with the dmrs-Type and the maxLength, and the first relationship includes at least one candidate of the antenna port field value, and a candidate antenna port corresponding to each candidate value in at least one candidate value of the antenna port field, wherein the number of candidate antenna ports corresponding to each candidate value is greater than or equal to N, and each The candidate antenna ports corresponding to the candidate values are included in the first antenna port group and/or the second antenna port group, wherein the first antenna port group and the second antenna port group include the same number of antenna ports, so The first antenna port group and the second antenna port group respectively correspond to at least two code division multiplexing groups, and the number of code division multiplexing
  • the transceiver unit is also configured to send first signaling, where the first signaling includes the dmrs-Type and the maxLength.
  • the above-mentioned DMRS port indication device includes a processor coupled with a memory; the processor is configured to support the device to perform corresponding functions in the above-mentioned DMRS port indication method.
  • Memory is coupled to the processor and stores computer programs (or computer-executable instructions) and/or data necessary for the apparatus.
  • the DMRS port indication device may also include a communication interface for supporting communication between the device and other network elements, such as the sending or receiving of data and/or signals.
  • the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.
  • the memory can be located inside the DMRS port indicating device and integrated with the processor; it can also be located outside the DMRS port indicating device.
  • the above-mentioned DMRS port indication device includes a processor and a transceiver device, the processor is coupled to the transceiver device, and the processor is used to execute a computer program or instructions to control the transceiver device. To receive and send information; when When the processor executes the computer program or instructions, the processor is also used to implement the above method through logic circuits or execution code instructions.
  • the transceiver device may be a transceiver, a transceiver circuit, an interface circuit or an input/output interface, used for receiving signals from other DMRS port indicating devices other than the DMRS port indicating device and transmitting them to the processor or Signals from the processor are sent to other DMRS port indicating devices other than the DMRS port indicating device.
  • the DMRS port indication device is a chip
  • the transceiver device is a transceiver circuit or an input-output interface.
  • the sending unit may be an output unit, such as an output circuit or a communication interface; the receiving unit may be an input unit, such as an input circuit or a communication interface.
  • the sending unit may be a transmitter or a transmitter; the receiving unit may be a receiver or a receiver.
  • the number of candidate antenna ports corresponding to each candidate value is N.
  • the first relationship further includes a non-mapping corresponding to each candidate value of at least one candidate value of the antenna port field in the DCI.
  • the number of DMRS code division multiplexing groups of data is not limited to.
  • the DMRS corresponding to the candidate antenna port corresponding to the at least one candidate value is mapped on one symbol, and the candidate antenna port corresponding to the at least one candidate value Belongs to two DMRS code division multiplexing groups; or the DMRS corresponding to the candidate antenna port corresponding to the at least one candidate value is mapped on two symbols, and the candidate antenna port corresponding to the at least one candidate value belongs to one DMRS code division multiplexing group. Use groups.
  • the DMRS corresponding to the candidate antenna port corresponding to the at least one candidate value is mapped on one symbol, and the candidate antenna port corresponding to the at least one candidate value Belonging to two DMRS code division multiplexing groups that do not map data; or the DMRS corresponding to the candidate antenna port corresponding to the at least one candidate value is mapped on two symbols, and the candidate antenna port corresponding to the at least one candidate value belongs to one DMRS code division multiplexing group that does not map data.
  • the DMRS corresponding to the candidate antenna port corresponding to at least one candidate value is mapped on one symbol, reducing symbol overhead; or the candidate antenna port corresponding to at least one candidate value belongs to a DMRS code division multiplexing group that does not map data.
  • the remaining time-frequency resources corresponding to the code division multiplexing group can be used for mapping data, reducing resource requirements and improving resource utilization.
  • the DMRS is mapped on one symbol, and the candidate antenna port corresponding to the at least one candidate value belongs to two DMRS code division multiplexing groups; or The DMRS is mapped on two symbols, and the candidate antenna port corresponding to the at least one candidate value belongs to a DMRS code division multiplexing group.
  • the dmrs-Type is 1, the maxLength is 1, and the N is 5; the value of the antenna port field is the first value , the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0-4.
  • the dmrs-Type is 1, the maxLength is 1, and the N is 6; the value of the antenna port field is the second value , the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0, 1, 2, 3, 4, and 6.
  • the dmrs-Type is 1, the maxLength is 1, and the N is 7; the value of the antenna port field is a third value , the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0-6.
  • the dmrs-Type is 1, the maxLength is 1, and the N is 8; the value of the antenna port field is a fourth value , the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0-7.
  • the dmrs-Type is 1, the maxLength is 1, and the N is 5; the value of the antenna port field is the first value , the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0, 1, 2, 3, and 8.
  • the dmrs-Type is 1, the maxLength is 1, and the N is 6; the value of the antenna port field is the second value , the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0, 1, 2, 3, 8, and 10.
  • the dmrs-Type is 1, the maxLength is 1, and the N is 7; the value of the antenna port field is a third value , the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0, 1, 2, 3, 8, 9, and 10.
  • the dmrs-Type is 1, the maxLength is 1, and the N is 8; the value of the antenna port field is a fourth value , the number of DMRS code division multiplexing groups without mapping data is 2, and the antenna The ports are 0,1,2,3,8,9,10,11.
  • the first antenna port group and the second antenna port group respectively include 4 antenna ports, and the first antenna port group and the The second antenna port group corresponds to two CDM groups respectively.
  • the first antenna port group and the second antenna port group include a total of 8 antenna ports, corresponding to antenna port indexes 0, 1, and 2 respectively. ,3,4,5,6,7, or corresponding to the antenna port index 0,1,2,3,8,9,10,11 respectively.
  • the two CDM groups corresponding to the first antenna port group and the second antenna port group are CDM group 0 and CDM group 1 respectively.
  • the dmrs-Type is 1, the maxLength is 2, and the N is 5; the value of the antenna port field is a fifth value , the number of DMRS code division multiplexing groups without mapping data is 1, the antenna ports are 0, 1, 4, 5, 8, the DMRS is mapped on two symbols; and/or the antenna ports The value of the field is the sixth value, the number of DMRS code division multiplexing groups without mapping data is 2, the antenna ports are 0-4, and the DMRS is mapped on one symbol.
  • the dmrs-Type is 1, the maxLength is 2, and the N is 6;
  • the value of the antenna port field is a seventh value , the number of DMRS code division multiplexing groups without mapping data is 1, the antenna ports are 0, 1, 4, 5, 8, 9, the DMRS is mapped on two symbols; and/or the The value of the antenna port field is the eighth value, the number of DMRS code division multiplexing groups that do not map data is 2, the antenna ports are 0, 1, 2, 3, 4, 6, and the DMRS is mapped in on a symbol.
  • the dmrs-Type is 1, the maxLength is 2, and the N is 7;
  • the value of the antenna port field is a ninth value , the number of DMRS code division multiplexing groups without mapping data is 1, the antenna ports are 0, 1, 4, 5, 8, 9, 12, and the DMRS is mapped on two symbols; and/or
  • the value of the antenna port field is the tenth value, the number of DMRS code division multiplexing groups without data mapping is 2, the antenna port is 0-6, and the DMRS is mapped on one symbol.
  • the dmrs-Type is 1, the maxLength is 2, and the N is 8; the value of the antenna port field is 11 value, the number of DMRS code division multiplexing groups without mapping data is 1, the antenna ports are 0, 1, 4, 5, 8, 9, 12, 13, and the DMRS is mapped on two symbols; and/or the value of the antenna port field is the twelfth value, the number of DMRS code division multiplexing groups without mapping data is 2, the antenna port is 0-7, and the DMRS is mapped in one symbol superior.
  • the first antenna port group and the second antenna port group respectively include 8 antenna ports, and the first antenna port group and the The second antenna port group corresponds to two CDM groups respectively.
  • the first antenna port group and the second antenna port group include a total of 16 antenna ports, corresponding to antenna port indexes 0, 1, and 2 respectively. ,3,4,5,6,7,8,9,10,11,12,13,14,15.
  • the two CDM groups corresponding to the first antenna port group and the second antenna port group are CDM group 0 and CDM group 1 respectively.
  • the DMRS-Type is 2, the maxLength is 1, and the N is 5; the value of the antenna port field is 13 value, the number of DMRS code division multiplexing groups for which data is not mapped is 3, and the antenna ports are 0-4; and/or the value of the antenna port field is the fourteenth value, and the data is not mapped
  • the number of DMRS code division multiplexing groups is 2, and the antenna ports are 0,1,2,3,6.
  • the DMRS-Type is 2, the maxLength is 1, and the N is 6; the value of the antenna port field is fifteenth value, the number of DMRS code division multiplexing groups for which data is not mapped is 3, and the antenna ports are 0-5; and/or the value of the antenna port field is the sixteenth value, and the data is not mapped
  • the number of DMRS code division multiplexing groups is 2, and the antenna ports are 0,1,2,3,6,8.
  • the DMRS-Type is 2, the maxLength is 1, and the N is 7; the value of the antenna port field is seventeenth value, the number of DMRS code division multiplexing groups for which data is not mapped is 3, and the antenna ports are 0-6; and/or the value of the antenna port field is the eighteenth value, and the data is not mapped
  • the number of DMRS code division multiplexing groups is 2, and the antenna ports are 0,1,2,3,6,7,8.
  • the DMRS-Type is 2, the maxLength is 1, and the N is 8; the value of the antenna port field is 19 value, the number of DMRS code division multiplexing groups without mapping data is 3, the antenna ports are 0, 1, 2, 3, 4, 5, 6, 8; and/or the antenna port field is The value is the twentieth value, the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0, 1, 2, 3, 6, 7, 8, 9.
  • the DMRS-Type is 2, the maxLength is 1, and the N is 5; the value of the antenna port field is 13 value, the number of DMRS code division multiplexing groups for which data is not mapped is 3, and the antenna ports are 0-4; and/or the value of the antenna port field is the fourteenth value, and the data is not mapped
  • the number of DMRS code division multiplexing groups is 2, and the antenna ports are 0,1,2,3,12.
  • the DMRS-Type is 2, the maxLength is 1, and the N is 6; the value of the antenna port field is fifteenth value, the number of DMRS code division multiplexing groups without mapping data is 3, and the number of days The line port is 0-5; and/or the value of the antenna port field is the sixteenth value, the number of DMRS code division multiplexing groups without mapping data is 2, and the antenna port is 0,1, 2,3,12,14.
  • the DMRS-Type is 2, the maxLength is 1, and the N is 7; the value of the antenna port field is seventeenth value, the number of DMRS code division multiplexing groups without mapping data is 3, the antenna ports are 0, 1, 2, 3, 4, 5, 12; and/or the value of the antenna port field is The eighteenth value: the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0, 1, 2, 3, 12, 13, and 14.
  • the DMRS-Type is 2, the maxLength is 1, and the N is 8; the value of the antenna port field is 19 value, the number of DMRS code division multiplexing groups without mapping data is 3, the antenna ports are 0, 1, 2, 3, 4, 5, 12, 14; and/or the antenna port field is The value is the twentieth value, the number of DMRS code division multiplexing groups without data mapping is 2, and the antenna ports are 0, 1, 2, 3, 12, 13, 14, and 15.
  • the first antenna port group and the second antenna port group respectively include 6 antenna ports, and the first antenna port group and the The second antenna port group corresponds to three CDM groups respectively.
  • the first antenna port group and the second antenna port group include a total of 12 antenna ports, corresponding to antenna port indexes 0, 1, and 2 respectively. ,3,4,5,6,7,8,9,10,11, or corresponding to the antenna port index 0,1,2,3,4,5,12,13,14,15,16,17 respectively.
  • the three CDM groups respectively corresponding to the first antenna port group and the second antenna port group are CDM group 0, CDM group 1 and CDM group 2.
  • the DMRS-Type is 2, the maxLength is 2, and the N is 5; the value of the antenna port field is 20 A value, the number of DMRS code division multiplexing groups without mapping data is 3, the antenna ports are 0-4, and the DMRS is mapped on one symbol; and/or the value of the antenna port field is The twenty-second value, the number of DMRS code division multiplexing groups without data mapping is 2, the antenna ports are 0, 1, 2, 3, 6, and the DMRS is mapped on one symbol; and/or The value of the antenna port field is the twenty-third value, the number of DMRS code division multiplexing groups without mapping data is 1, the antenna ports are 0, 1, 6, 7, and 12, and the DMRS Map on two symbols.
  • the DMRS-Type is 2, the maxLength is 2, and the N is 6; the value of the antenna port field is 20 Four values, the number of DMRS code division multiplexing groups without mapping data is 3, the antenna ports are 0-5, the DMRS is mapped on one symbol; and/or the value of the antenna port field is The twenty-fifth value, the number of DMRS code division multiplexing groups without mapping data is 2, the antenna ports are 0, 1, 2, 3, 6, 8, and the DMRS is mapped on one symbol; and /or the value of the antenna port field is the twenty-sixth value, the number of DMRS code division multiplexing groups without data mapping is 1, and the antenna ports are 0, 1, 6, 7, 12, 13 , the DMRS is mapped on two symbols.
  • the DMRS-Type is 2, the maxLength is 2, and the N is 7; the value of the antenna port field is 20 Seven values, the number of DMRS code division multiplexing groups without mapping data is 2, the antenna ports are 0, 1, 2, 3, 6, 7, 8, and the DMRS is mapped on one symbol; and/ Or the value of the antenna port field is the twenty-eighth value, the number of DMRS code division multiplexing groups without mapping data is 1, and the antenna ports are 0, 1, 6, 7, 12, 13, 18.
  • the DMRS is mapped on two symbols.
  • the DMRS-Type is 2, the maxLength is 2, and the N is 8; the value of the antenna port field is 20 Nine values, the number of DMRS code division multiplexing groups without mapping data is 2, the antenna ports are 0, 1, 2, 3, 6, 7, 8, and the DMRS is mapped on one symbol; and/ Or the value of the antenna port field is the thirtieth value, the number of DMRS code division multiplexing groups without mapping data is 1, and the antenna ports are 0, 1, 6, 7, 12, 13, 18 ,19. The DMRS is mapped on two symbols.
  • the first antenna port group and the second antenna port group respectively include 12 antenna ports, and the first antenna port group and the The second antenna port group corresponds to three CDM groups respectively.
  • the first antenna port group and the second antenna port group include a total of 24 antenna ports, corresponding to antenna port indexes 0, 1, and 2 respectively. ,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23.
  • the three CDM groups respectively corresponding to the first antenna port group and the second antenna port group are CDM group 0, CDM group 1 and CDM group 2.
  • the DMRS-Type is 1, the maxLength is 2, the N is 5, and the value of the antenna port field is the thirtieth One value, the number of code division multiplexing groups is 2, the antenna ports are 0-4, the DMRS is mapped on two symbols; and/or the dmrs-Type is 1, the maxLength is 2 , the N is 6, the value of the antenna port field is the thirty-second value, the number of code division multiplexing groups is 2, and the antenna ports are 0,1,2,3,4,6 , the DMRS is mapped on two symbols; and/or the DMRS-Type is 1, the maxLength is 2, the N is 7, and the value of the antenna port field is the thirty-third value, so The number of code division multiplexing groups is 2, the antenna ports are 0-6, and the DMRS is mapped on two symbols; and/or the The dmrs-Type is 1, the maxLength is 2, the N is 8, the value of the antenna port field is the
  • a communication system which includes the DMRS port indicating device as described in the third aspect and the DMRS port indicating device as described in the fourth aspect.
  • a computer-readable storage medium on which a computer program or instructions are stored.
  • the program or instructions are executed by a processor, as in any one of the first aspect, the second aspect, or any one of the Implement the method described to be executed.
  • a seventh aspect provides a computer program product that, when executed on a computing device, causes the method described in any one of the first aspect, the second aspect or any implementation to be executed.
  • An eighth aspect provides a circuit, the circuit is coupled with a memory, and the circuit is used to execute any one of the first aspect, the second aspect or any one of the methods described above.
  • the circuit may include chip circuitry.
  • Figure 1 is a schematic diagram of a communication system involved in this application.
  • Figure 2 is a schematic diagram of DMRS time-frequency resource mapping provided by an embodiment of the present application.
  • Figure 3 is a schematic diagram of a DMRS port expansion provided by an embodiment of the present application.
  • Figure 4 is a schematic diagram of another DMRS port expansion provided by an embodiment of the present application.
  • Figure 5 is a schematic flow chart of a DMRS port indication method provided by an embodiment of the present application.
  • Figure 6a is a schematic diagram of time-frequency resource mapping of single symbol, Type 1 DMRS provided by the embodiment of the present application;
  • Figure 6b is a schematic diagram of time-frequency resource mapping of dual-symbol, type 1 DMRS provided by an embodiment of the present application;
  • Figure 7a is a schematic diagram of time-frequency resource mapping of single symbol, type 2DMRS provided by the embodiment of the present application.
  • Figure 7b is a schematic diagram of time-frequency resource mapping of dual-symbol, type 2DMRS provided by the embodiment of the present application;
  • Figure 8 is a schematic structural diagram of a DMRS port indication device provided by an embodiment of the present application.
  • Figure 9 is a schematic structural diagram of a simplified terminal provided by an embodiment of the present application.
  • Figure 10 is a schematic structural diagram of a simplified network device provided by an embodiment of the present application.
  • Figure 11 is a schematic structural diagram of another DMRS port indication device provided by an embodiment of the present application.
  • the technical solution provided by this application can be applied to various communication systems, such as: long term evolution (LTE) system, fifth generation ( 5th generation, 5G) communication system (or new radio (NR) ) system) and other future communication systems such as the sixth generation ( 6th generation, 6G) communication system, etc.
  • LTE long term evolution
  • 5th generation, 5G fifth generation
  • NR new radio
  • 6th generation, 6G sixth generation
  • the technical solutions provided by this application can also be applied to Internet of Things (IoT) systems, narrowband Internet of Things (NB-IoT) systems, etc.
  • IoT Internet of Things
  • NB-IoT narrowband Internet of Things
  • Figure 1 shows a schematic diagram of a communication system involved in this application.
  • the communication system includes at least one network device and at least one terminal.
  • a network device and multiple terminals (the figure illustrates user equipment (UE) 1 to UE5) form a communication system.
  • UE1 to UE5 can communicate with network equipment.
  • the link environment includes uplink, downlink and side-link transmission.
  • the information transmitted in the link includes the actual transmitted data information. and control information used to direct or dispatch actual data.
  • UE3, UE4 and UE5 can also form a communication system, and its link transmission environment is consistent with the above. The specific information interaction depends on the network configuration method.
  • the above network device may be a device capable of communicating with the terminal.
  • the network device can be any device with wireless transceiver function. Including but not limited to: base stations such as Node B (NodeB), evolved base stations such as evolved Node B (eNodeB), base stations in the fifth generation (5G) communication system, base stations or network equipment in future communication systems , access nodes, wireless relay nodes, wireless backhaul nodes, etc. in WiFi systems.
  • the network device can also be wireless control in the cloud radio access network (CRAN) scenario. device.
  • Network equipment can also be small stations, transmission nodes (transmission reference points, TRPs), etc. The embodiments of this application do not limit the specific technology and specific equipment form used by the network equipment.
  • the network device can also be an access node, wireless relay node, wireless backhaul node, etc. in a wireless LAN (wireless fidelity, WiFi) system.
  • the network device can also be a wireless controller in a cloud radio access network (CRAN) scenario.
  • CRAN cloud radio access network
  • the base stations may include centralized units (CU) and distributed units (DU).
  • CU can also be divided into CU-control plane (CP) and CU-user plane (User plane, UP).
  • CP CU-control plane
  • UP CU-user plane
  • the base station may also be an open radio access network (openradioaccess network, ORAN) architecture, etc. This application does not limit the specific deployment method of the base station.
  • the above-mentioned terminal is a device with wireless transceiver function, which can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on water, such as ships, etc.; it can also be deployed in the air, such as aircraft, Balloons and satellites alike.
  • the terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver functions, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, an industrial control ( Wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, and transportation safety wireless terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the embodiments of this application do not limit application scenarios.
  • the terminal equipment may sometimes also be called user equipment, access terminal equipment, UE unit, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, terminal, wireless communication equipment, UE agent or UE device
  • terminals can also communicate through device-to-device (D2D), vehicle-to-everything (V2X) or machine-to-machine (V2X).
  • D2D device-to-device
  • V2X vehicle-to-everything
  • V2X machine-to-machine
  • M2M machine to machine
  • system and “network” in the embodiments of this application may be used interchangeably.
  • DMRS is used to estimate data channels (such as physical uplink shared channel (PUSCH) or physical downlink shared channel (PDSCH)) or control channels (such as physical uplink control channel (PUCCH) ) or the equivalent channel matrix experienced by the physical downlink control channel (PDCCH), which is used for data detection and demodulation.
  • data channels such as physical uplink shared channel (PUSCH) or physical downlink shared channel (PDSCH)
  • control channels such as physical uplink control channel (PUCCH)
  • PUCCH physical uplink control channel
  • DMRS is usually precoded the same as the transmitted data signal, thereby ensuring that DMRS and data experience the same equivalent channel.
  • the DMRS vector sent by the sender is s
  • the data symbol vector sent is x
  • DMRS and data perform the same precoding operation (multiplied by the same precoding matrix P)
  • the corresponding received signal vector at the receiver can be expressed as:
  • the equivalent channels experienced are both Based on the known DMRS vector s, the receiving end uses channel estimation algorithms (such as least squares (LS) channel estimation, minimum mean square error (MMSE) channel estimation, etc.) to obtain the equivalent channel estimate.
  • channel estimation algorithms such as least squares (LS) channel estimation, minimum mean square error (MMSE) channel estimation, etc.
  • LS least squares
  • MMSE minimum mean square error
  • MIMO equalization and subsequent demodulation of the data signal can be completed based on the equivalent channel.
  • N R is the number of receiving antennas and R is the number of transmission streams (also called the number of transmission layers, the number of spatial layers or the rank).
  • one DMRS port corresponds to one spatial layer.
  • One DMRS port corresponds to a group of DMRS symbols or a group of DMRS sequences.
  • the DMRS symbol includes multiple DMRS symbol elements, which are mapped to corresponding time-frequency resources for transmission.
  • the corresponding number of DMRS ports is R.
  • different DMRS ports are usually orthogonal ports.
  • DMRS symbols corresponding to different DMRS ports are orthogonal in at least one domain of frequency domain, time frequency or code domain.
  • transmission layer number and “rank” have the same meaning and can be used interchangeably.
  • antenna port and DMRS port have the same meaning and can be used interchangeably.
  • DMRS resources corresponding to multiple DMRS ports are often used through frequency division multiplexing (FDM), time division multiplexing (TDM) or code division multiplexing (CDM). way to map to the preset time and frequency resource.
  • FDM frequency division multiplexing
  • TDM time division multiplexing
  • CDM code division multiplexing
  • 5G NR supports 2 DMRS resource mapping types. For Type 1 DMRS, a maximum of 8 orthogonal ports can be supported; for Type 2 DMRS, a maximum of 12 orthogonal ports can be supported.
  • For a DMRS port in order to perform channel estimation on different time-frequency resources and ensure the quality of channel estimation, multiple DMRS symbols need to be sent in multiple time-frequency resources.
  • DMRS can occupy at least one orthogonal frequency division multiplexing (OFDM) symbol in the time domain, and the bandwidth occupied in the frequency domain is the same as the scheduling bandwidth of the scheduled data signal.
  • OFDM orthogonal frequency division multiplexing
  • Multiple DMRS symbols corresponding to one port correspond to one reference signal sequence, and one reference signal sequence includes multiple reference signal sequence elements.
  • the DMRS reference signal sequence may be a gold sequence. Taking the DMRS reference signal sequence as a gold sequence as an example, the nth element r(n) in the reference signal sequence can be generated by the following formula:
  • the pseudo-random sequence c(n) can be a gold sequence with a sequence length of 31.
  • N C 1600.
  • the second m sequence x 2 (n) is initialized by the parameter c init .
  • c init can be defined as
  • l represents the OFDM symbol index contained in a time slot, Represents the timeslot index within a system frame, Can be configured by higher layer signaling. It is related to the cell identification (ID), which can usually be equal to the cell ID. It is an initialization parameter, and the value can be 0 or 1.
  • ID the OFDM symbol index contained in a time slot
  • Can be configured by higher layer signaling It is related to the cell identification (ID), which can usually be equal to the cell ID.
  • ID can usually be equal to the cell ID.
  • ⁇ represents the code division multiplexing group index corresponding to the DMRS port.
  • the DMRS reference signal sequence corresponding to a port is mapped to the corresponding time-frequency resource after being multiplied by the corresponding mask sequence through the preset time-frequency resource mapping rules.
  • two types of DMRS configuration methods are defined, including Type 1 DMRS and Type 2 DMRS.
  • the m-th reference sequence element r(m) in the corresponding reference signal sequence is mapped to the resource element (RE) with index (k, l) p, ⁇ according to the following rules.
  • the RE with index (k, l) p, ⁇ corresponds to the OFDM symbol with index l in a time slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain.
  • ⁇ is the subcarrier spacing parameter, is the DMRS signal symbol corresponding to port p on the RE with index (k, l) p, ⁇ ,
  • the symbol index of the starting OFDM symbol occupied by the DMRS signal symbol or the symbol index of the reference OFDM symbol. is the power scaling factor
  • w t (l′) is the time domain mask element corresponding to the OFDM symbol with index l'
  • w f (k′) is the frequency domain mask element corresponding to the subcarrier with index k'
  • m 2n+k′
  • ⁇ is the subcarrier offset factor.
  • type 1 DMRS can support up to 8 orthogonal ports (1000 ⁇ 1007), p represents the DMRS port number, ⁇ represents the code division multiplexing group index corresponding to the DMRS port, ⁇ is the subcarrier offset factor, w t (l ′) is the time domain mask element corresponding to the OFDM symbol with index l', and w f (k′) is the frequency domain mask element corresponding to the subcarrier with index k'.
  • Type 2 DMRS can support up to 12 orthogonal ports (1000 ⁇ 1011), ⁇ is the index of the code division multiplexing group to which port p belongs, and DMRS ports in the same code division multiplexing group occupy the same time-frequency resources.
  • Equation (1) the time-frequency resource mapping method of Type 1 single-symbol DMRS and dual-symbol DMRS is shown in the first and second pictures from the left side of Figure 2.
  • CDM group 0 includes port 0 and port 1
  • CDM group 1 includes port 2 and port 3.
  • CDM group 0 and CDM group 1 are frequency division multiplexing (mapped on different frequency domain resources).
  • the DMRS ports included in the CMD group are mapped to the same time-frequency resources.
  • the reference signals corresponding to the DMRS ports contained in the CMD group are distinguished by orthogonal cover codes (OCC), thereby ensuring the orthogonality of the DMRS ports within the CDM group, thus suppressing the interference between DMRS transmission on different antenna ports.
  • OCC orthogonal cover codes
  • port 0 and 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 port 0 and port 1 are separated by one subcarrier. For a DMRS port, the two adjacent REs occupied correspond to an OCC codeword sequence of length 2.
  • port 0 and port 1 use a set of OCC codeword sequences of length 2 (+1+1 and +1-1).
  • port 2 and port 3 are located in the same RE and are mapped to the unoccupied REs of port 0 and port 1 in a comb-tooth manner in the frequency domain.
  • port 2 and port 3 use a set of OCC codeword sequences of length 2 (+1+1 and +1-1).
  • CDM group 0 includes port 0, port 1, port 4 and port 5
  • CDM group 1 includes port 2, port 3, port 6 and port 7.
  • CDM group 0 and CDM group 1 are frequency division multiplexers, and the reference signals corresponding to the DMRS ports included in the CMD group are distinguished by OCC.
  • port 0, port 1, port 4 and port 5 are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner, that is, the adjacent frequencies occupied by port 0, port 1, port 4 and port 5 are Domain resources are spaced one subcarrier apart.
  • the occupied two adjacent subcarriers and two OFDM symbols correspond to an OCC codeword sequence of length 4.
  • OCC codeword sequence For example, for subcarrier 0 and subcarrier 2 corresponding to OFDM symbol 1 and OFDM symbol 2, port 0, port 1, port 4 and port 5 use a set of OCC codes with a length of 4 (+1+1+1+1/+ 1+1-1-1/+1-1+1-1/+1-1-1+1).
  • port 2, port 3, port 6 and port 7 are located in the same RE and are mapped to the unoccupied subcarriers of port 0, port 1, port 4 and port 5 in a comb-tooth manner in the frequency domain.
  • port 2, port 3, port 6 and port 7 use a set of OCC codes with a length of 4 (+1+1+1+1/+1+ 1-1-1/+1-1+1-1/+1-1-1+1).
  • the time-frequency resource mapping methods of single-symbol DMRS and dual-symbol DMRS are shown in the third and fourth pictures from the left side of Figure 2.
  • a maximum of 6 ports are supported.
  • the 6 DMRS ports are divided into 3 code division multiplexing groups. Frequency division multiplexing is used between CDM groups.
  • the reference signals corresponding to the DMRS ports included in the CDM ensure orthogonality through OCC.
  • CDM group 0 includes port 0 and port 1; CDM group 1 includes port 2 and port 3; CDM group 2 includes port 4 and port 5.
  • CDM groups are frequency division multiplexed (mapped on different frequency domain resources).
  • the reference signals corresponding to the DMRS ports included in the CMD group are mapped on the same time-frequency resources.
  • the reference signals corresponding to the DMRS ports included in the CMD group are distinguished by OCC.
  • For a DMRS port its corresponding DMRS reference signal 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.
  • port 0 and port 1 are located in the same RE, and resource mapping is performed in a comb-tooth manner. Taking the frequency domain resource granularity as 1RB as an example, port 0 and port 1 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7.
  • Port 2 and port 3 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9.
  • Port 4 and port 5 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11.
  • OCC codeword sequences of length 2 (+1+1 and +1-1) in the two adjacent subcarriers.
  • CDM group 0 includes port 0, port 1, port 6 and port 7; CDM group 1 includes port 2, port 3, port 8 and port 9; CDM group 2 includes port 4, port 5, port 10 and port 11.
  • CDM groups are frequency division multiplexed (mapped on different frequency domain resources).
  • the reference signals corresponding to the DMRS ports included in the CMD group are mapped on the same time-frequency resources.
  • the reference signals corresponding to the DMRS ports included in the CMD group are distinguished by OCC.
  • For a DMRS port its corresponding DMRS reference signal 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.
  • the ports included in a CDM group are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner. Taking the frequency domain resource granularity as 1RB as an example, port 0, port 1, port 6 and port 7 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 corresponding to OFDM symbol 1 and OFDM symbol 2.
  • Port 2 port 3, port 8 and port 9 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9 corresponding to OFDM symbol 1 and OFDM symbol 2.
  • Port 4, port 5, port 10 and port 11 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11 corresponding to OFDM symbol 1 and OFDM symbol 2.
  • the corresponding OCC codeword sequence of length 4 (+1+1+1+1/+1+1- 1-1/+1-1+1-1/+1-1-1+1).
  • the number of transmitting and receiving antennas has further increased (the number of transmitting antennas of network equipment supports 128 transmitting antennas (transmission antenna, T) or 256T, and the number of terminal receiving antennas supports 8 receiving antennas (receiving antenna). , R)), the channel information is obtained more accurately and can further support a higher number of transmission streams to improve the spectrum efficiency of the MIMO system.
  • T transmission antenna
  • R receiving antenna
  • the simplest way to expand the number of existing orthogonal DMRS ports is to increase the time-frequency resources occupied by DMRS. This method can ensure that the number of DMRS symbols corresponding to each DMRS port remains unchanged. However, a doubled increase in DMRS overhead will also double the spectrum efficiency of the system.
  • Another method is to reuse DMRS resources corresponding to more orthogonal DMRS ports while ensuring the same time-frequency resources (overhead). In order not to increase additional time-frequency resource overhead, one of the effective technical solutions is to further introduce new DMRS ports through code division multiplexing enhancement based on the existing NR DMRS ports.
  • a DMRS port expansion method is shown in Figure 3.
  • the existing DMRS port group contains 8 Type 1 DMRS ports defined in the existing NR protocol
  • the expansion port group contains 8 new DMRS ports, so a total of up to 16 DMRS ports can be supported.
  • one CDM group corresponds to 4 DMRS ports.
  • the 4 DMRS ports in a CDM group are code division multiplexed through 4-long OCC codes (w 1 , w 2 , w 3 , w 4 ), and are mapped on 2 subcarriers and 2 OFDM symbols, where w 1 , The values of w 2 , w 3 , and w 4 are shown in Table 1.
  • each CDM group corresponds to 4 DMRS ports.
  • One CDM group corresponds to four DMRS ports and occupies the same time-frequency resources as DMRS ports belonging to the same CDM group defined in the existing NR protocol.
  • Figure 3 takes CDM group 0 as an example, corresponding to the newly added DMRS ports 8, 9, 12, and 13, occupying subcarriers with index 0/2/4/6/8/10 in one RB.
  • c(k′,l′) represents the inner mask, which can be an OCC code of length 4 (such as walsh code), used to ensure the orthogonality of four new DMRS ports multiplexed in a CDM group.
  • Type 2 dual-symbol DMRS For Type 2 dual-symbol DMRS, a similar DMRS port expansion design can be adopted.
  • the DMRS port expansion method is shown in Figure 4.
  • the time-frequency resource mapping method of Type 2 DMRS expansion port is also shown in Equation (2).
  • c f (k′)c t (l′) is defined as shown in Table 3 below:
  • Type 1 single-symbol DMRS and Type 2 dual-symbol DMRS a similar DMRS port expansion design can also be adopted.
  • the maximum number of orthogonal DMRS ports supported is 4. Through the above DMRS expansion design, the maximum number of orthogonal DMRS ports supported can be increased to 8.
  • the maximum number of orthogonal DMRS ports supported is 6. Through the above DMRS expansion design, the maximum number of orthogonal DMRS ports supported can be increased to 12.
  • the terminal's sending behavior is scheduled by the network device.
  • the network device needs to notify the terminal of the number of data streams corresponding to the uplink data sent (also called rank) and the corresponding DMRS port index through indication information. Therefore, the terminal can send the uplink data and DMRS according to the indicated number of DMRS and transmission streams on the corresponding time-frequency resource at the time when the uplink data is sent.
  • the uplink (UL) supports up to 4 stream transmissions
  • the network device indicates the number of transmission streams (rank) and the corresponding DMRS port index to the terminal through downlink control information (DCI).
  • the DCI signaling includes an antenna port field, which is used to indicate the corresponding DMRS port index. For different rank values, corresponding to different DMRS Port index table.
  • Table 7 dmrs-Type 1
  • the maximum number of DMRS symbols is (maxLength)1
  • the DMRS port index corresponding to rank 1 (1000+DMRS port)
  • the number of DMRS CDM groups without data mapping is 1 (number of DMRS CDM group(s)without data), and the corresponding DMRS port (DMRS port (s)) index is 0, the number of front-load symbols is 1 symbol; the value of the antenna port field is 1, the number of DMRS CDM groups that do not map data is 1, and the corresponding DMRS The port index is 1, the number of prefixed symbols is 1 symbol, etc.
  • the value of the antenna port field is 0, the number of DMRS CDM groups that do not map data is 1, the corresponding DMRS port indexes are 0 and 1, and the number of prefix symbols is 1 symbol; the antenna port field The value of is 1, the number of DMRS CDM groups that do not map data is 2, the corresponding DMRS port indexes are 0 and 1, the number of prefix symbols is 1 symbol, and so on.
  • the value of the antenna port field is 0, the number of DMRS CDM groups that do not map data is 2, the corresponding DMRS port indexes are 0, 1, and 2, and the number of preamble symbols is 1 symbol.
  • the value of the antenna port field is 0, the number of DMRS CDM groups that do not map data is 2, the corresponding DMRS port indexes are 0, 1, and 2, and the number of preamble symbols is 1 symbol.
  • the DMRS port index tables corresponding to rank 1 to rank 4 are as shown in Tables 11 to 14.
  • the terminal can select the corresponding DMRS port index table based on the indicated rank value, thereby determining the indicated port index.
  • the antenna port field when the value of the antenna port field is 0, the number of DMRS CDM groups that do not map data is 1, the index of the corresponding DMRS port is 0, and the number of prefix symbols is 1 symbol; the antenna port field The value of is 1, the number of DMRS CDM groups that do not map data is 1, the corresponding DMRS port index is 1, the number of prefix symbols is 1 symbol, and so on.
  • the value of the antenna port field is 0, the number of DMRS CDM groups that do not map data is 1, the corresponding DMRS port indexes are 0 and 1, and the number of prefix symbols is 1 symbol; the antenna port field The value of is 1, the number of DMRS CDM groups that do not map data is 2, the corresponding DMRS port indexes are 0 and 1, the number of prefix symbols is 1 symbol, and so on.
  • the value of the antenna port field is 0, the number of DMRS CDM groups that do not map data is 2, the corresponding DMRS port indexes are 0, 1, and 2, and the number of preamble symbols is 1 symbol; antenna The value of the port field is 1, the number of DMRS CDM groups that do not map data is 2, the corresponding DMRS port indexes are 0, 1, and 4, the number of prefix symbols is 2 symbols, and so on.
  • the value of the antenna port field is 0, the number of DMRS CDM groups that do not map data is 2, the corresponding DMRS port indexes are 0, 1, 2, and 3, and the number of prefix symbols is 1 symbol ;
  • the value of the antenna port field is 1, the number of DMRS CDM groups that do not map data is 2, the corresponding DMRS port indexes are 0, 1, 4 and 5, the number of prefix symbols is 2 symbols, and so on.
  • the network device can also indicate to the terminal the number of data flows sent, rank, and the corresponding DMRS port index.
  • the DCI signaling includes an antenna port field, which is used to indicate the allocated DMRS port index.
  • DMRS port index table The antenna port field in DCI signaling indicates the index value in the DMRS port table corresponding to the dmrs-Type and maxLength values configured in the high-layer signaling. Each index value corresponds to one or more DMRS port indexes.
  • the NR system can process up to 2 codewords at the same time: codeword 0 and codeword 1.
  • Single-code word streams can be mapped to up to 4 layers (i.e. 4 DMRS ports), and dual-code word streams can be mapped to up to 8 layers. In this scenario, only a single code word stream is required. For example, codeword 0 is enabled and codeword 1 is disabled.
  • the antenna port field includes 4 bits, corresponding to the values of 16 antenna port fields. Among them, the value of the antenna port field is 12-15 as reserved bits.
  • dmrs-Type 1
  • a single time domain symbol can support up to 4 DMRS ports: port 0 ⁇ port3.
  • the value of the antenna port field is "0", which is used to indicate port 0; the value of the antenna port field is "1", which is used to indicate antenna port port 1, and so on.
  • CDM group 0 The above four DMRS ports can be divided into two CDM groups: CDM group 0 and CDM group 1.
  • the number of DMRS code division multiplexing groups that do not map data determines whether DMRS and data signals can be multiplexed on the same OFDM symbol.
  • the number of DMRS code division multiplexing groups that do not map data is 1, it means that the time-frequency resources corresponding to one CDM group will not map data signals, and the time-frequency resources corresponding to the remaining one CDM group can be used to map data signals. .
  • the time-frequency resources that do not map data signals are the time-frequency resources corresponding to CDM group 0, and the time-frequency resources that can map data are the time-frequency resources corresponding to CDM group 1; the time-frequency resources of the DMRS code division multiplexing group that do not map data are When the number is 2, it means that the time-frequency resources corresponding to the two CDM groups will not map data signals. At this time, no data symbols will be mapped within the OFDM symbols mapped by DMRS.
  • the above time-frequency resources that do not map data signals can be used to send DMRS, or are idle and do not send signals.
  • maxLength 1 means that the maximum time domain symbol length allowed by different preamble DMRS is 1, that is, DMRS is allowed to be mapped to up to 1 time domain symbol.
  • the antenna port field is 5 bits and can have 32 values.
  • the antenna ports are less than 4 ports, only a single codeword stream is required. For example, codeword 0 is enabled and codeword 1 is not enabled.
  • dual codeword streams are required. Illustratively, both codeword 0 and codeword 1 are enabled.
  • maxLength 2 means that the maximum time domain symbol length allowed by different preamble DMRS is 2, that is, DMRS is allowed to be mapped to up to 2 time domain symbols.
  • the number of front-load symbols is 1, which allows DMRS to be mapped to 1 time domain On symbols; when the value of the antenna port field is "12" to "30", the number of preamble symbols is 2, which allows DMRS to be mapped to 2 time domain symbols.
  • the number of preamble symbols is 2, which allows DMRS to be mapped to 2 time domain symbols.
  • the number of DMRS code division multiplexing groups that do not map data determines whether DMRS and data signals can be multiplexed on the same OFDM symbol.
  • the number of DMRS code division multiplexing groups that do not map data is 1, it means that the time-frequency resources corresponding to one CDM group will not map data signals, and the time-frequency resources corresponding to the remaining two CDM groups can be used to map data signals. .
  • the time-frequency resources that do not map data signals are the time-frequency resources corresponding to CDM group 0, and the time-frequency resources that can map data are the time-frequency resources corresponding to CDM group 1 and the time-frequency resources corresponding to CDM group 2; no mapping
  • the number of DMRS code division multiplexing groups of data is 2, it means that the time-frequency resources corresponding to the two CDM groups will not map data signals, and the time-frequency resources corresponding to the remaining 1 CDM group can be used to map data signals.
  • the time-frequency resources that do not map data signals are the time-frequency resources corresponding to CDM Group 0 and CDM Group 1, and the time-frequency resources that can map data are the time-frequency resources corresponding to CDM Group 2; the DMRS code divisions that do not map data
  • the number of multiplexing groups is 3, it means that the time-frequency resources corresponding to the 3 CDM groups will not map data signals.
  • no data symbols will be mapped within the OFDM symbols mapped by DMRS.
  • the above time-frequency resources that do not map data signals can be used to send DMRS, or are idle and do not send signals.
  • one time domain symbol can support up to 6 orthogonal DMRS ports.
  • the antenna port field is 6 bits and can have 64 values.
  • the number of preamble symbols is 2, which allows DMRS to be mapped to 2 time domain symbols.
  • a larger number of antennas enables a higher number of transmission streams.
  • it is necessary to further support MIMO transmission of more than 4 streams for a single terminal, for example, support ranks 5 to 8).
  • the upstream DMRS port index table as mentioned above cannot support transmission of more than 4 streams.
  • the current downlink can support the transmission of up to 8 streams, but supporting ranks 5 to 8 requires a large DMRS overhead.
  • Type 1 single-symbol DMRS there are only a maximum of 4 DMRS ports and cannot support ranks 5 to 8. Therefore, Type 1DMRS needs to support transmission of more than 4 streams, and dual-symbol DMRS must be used.
  • Type 2 single-symbol DMRS only rank 6 transmission can be supported. In order to support rank 7 and rank 8, dual-symbol DMRS must be used. Compared with single-symbol DMRS, dual-symbol DMRS will add an additional OFDM symbol overhead.
  • DMRS can support 2 times the number of orthogonal DMRS ports through capacity expansion, which provides new design capabilities for the optional DMRS port index design of ranks 5 to 8.
  • DMRS port index design of ranks 5 to 8. there is currently no solution on how to indicate the DMRS ports of ranks 5 to 8.
  • this application provides a DMRS port indication scheme.
  • a first relationship is determined.
  • the first relationship is associated with dmrs-Type and maxLength.
  • the first relationship includes at least one of the antenna port fields.
  • each candidate antenna port corresponding to the candidate value is included in the first antenna port group and/or the second antenna port group, and receives the DCI, determines the corresponding antenna port according to a value indicated by the antenna port field in the DCI, and receives the determination
  • the antenna port corresponds to the DMRS, and the indication of the DMRS antenna port for more than 4 streams is implemented.
  • FIG. 5 it is a schematic flowchart of a DMRS port indication method provided by an embodiment of the present application.
  • the method may include the following steps:
  • the terminal obtains the type of demodulation reference signal DMRS (dmrs-Type) and the maximum number of DMRS symbols (maxLength).
  • the network device may send first signaling, which includes the above-mentioned dmrs-Type and maxLength.
  • the network device may include the above DMRS-Type and maxLength in higher layer signaling (higher layer parameter), such as radio resource control (radio resource control, RRC) or radio resource control reconfiguration (RRCReconfiguration) message.
  • dmrs-Type can be Type 1 or Type 2.
  • the optional values of dmrs-Type can also include Type 1E and Type 2E, where Type 1E represents R18 expanded DMRS type 1, and Type 2E represents R18 expanded DMRS type 2.
  • the terminal can also obtain the above-mentioned DMRS-Type and maxLength through other methods. For example, they can be pre-stored in the terminal, or obtained through pre-negotiation between the terminal and the network device, or obtained through other signaling.
  • the type of demodulation reference signal DMRS (dmrs-Type) and the maximum number of DMRS symbols (maxLength) can also be named by other names, and the embodiments of the present application do not limit this.
  • the terminal determines the first relationship.
  • the first relationship includes at least one candidate value of the antenna port field and a candidate antenna port corresponding to each candidate value of the at least one candidate value of the antenna port field.
  • the number of candidate antenna ports corresponding to each candidate value is greater than or equal to N, and N is greater than 4.
  • N can be 5-8.
  • the candidate antenna port corresponding to each candidate value is for a single terminal (single user, SU).
  • the above candidate antenna port is relative to the antenna port corresponding to a value indicated by the antenna port field in the DCI.
  • the candidate antenna port is the antenna port in the DMRS port index table, and DMRS can be sent on this antenna port. DMRS may not be sent on this antenna port.
  • the number of candidate antenna ports corresponding to each candidate value is N.
  • N antenna ports correspond to N spatial layers.
  • the first relationship is associated with dmrs-Type and maxLength. According to differences in dmrs-Type and maxLength, at least one candidate value of the antenna port field and N candidate antenna ports corresponding to each candidate value of the at least one candidate value of the antenna port field may be different.
  • the candidate antenna ports corresponding to each of the above candidate values are included in the first antenna port group and the second antenna port group.
  • the first antenna port group and the second antenna port group include the same number of antenna ports, the first antenna port group and the second antenna port group respectively correspond to at least two code division multiplexing groups, and the first antenna port group and The number of code division multiplexing groups corresponding to the second antenna port group is the same.
  • the first antenna port group and the second antenna port group correspond to the same multiple code division multiplexing groups.
  • the DMRS corresponding to the antenna ports included in the first antenna port group and the second antenna port group corresponding to the same code division multiplexing group are mapped on the same time-frequency resource.
  • the first antenna port group here can be called the expanded antenna port group, as shown in Figure 3 or Figure 4; the second antenna port group can be called the unexpanded antenna port group or the existing antenna port group, as shown in Figure 2 shown.
  • the number of antenna ports included in the expanded antenna port group is the same as the number of antenna ports included in the unexpanded antenna port group.
  • the expanded antenna port group and the unexpanded antenna port group respectively correspond to at least two code division multiplexing groups, and the number of code division multiplexing groups corresponding to the expanded antenna port group and the unexpanded antenna port group is the same.
  • FIG. 6a it is a schematic diagram of time-frequency resource mapping of single symbol, type 1 DMRS provided by the embodiment of the present application.
  • the maximum number of DMRS ports that can be supported is 8, which is divided into 2 antenna port groups.
  • each antenna port group contains 4 DMRS ports.
  • the first antenna port group includes DMRS ports 4, 5, 6, and 7, and the second antenna port group includes DMRS ports 0, 1, 2, and 3.
  • DMRS ports 4 and 5 in the first antenna port group correspond to CDM group 0, DMRS ports 6 and 7 in the first antenna port group correspond to CMD group 1; DMRS ports 0 and 1 in the second antenna port group correspond to CDM Group 0, DMRS ports 2 and 3 in the second antenna port group correspond to CDM group 1.
  • the first antenna port group and the second antenna port group correspond to two CDM groups respectively, and the corresponding numbers of the first antenna port group and the second antenna port group are the same.
  • the DMRS corresponding to the DMRS ports belonging to the same CDM group in the first antenna port group and the second antenna port group are mapped on the same time-frequency resource.
  • the antenna port index corresponding to the antenna port included in the first antenna port group can also be 8, 9, 10, 11, and the antenna port index included in the second antenna port group The antenna port indexes corresponding to the antenna ports are 0, 1, 2, and 3.
  • the antenna ports included in the first antenna port group correspond to antenna port indexes E, F, G, H, and the antenna ports included in the second antenna port group The antenna port indexes corresponding to the ports are A, B, C, and D.
  • FIG. 6b it is a schematic diagram of the time-frequency resource mapping of dual-symbol, type 1 DMRS provided by the embodiment of the present application.
  • the maximum number of DMRS ports that can be supported is 16, divided into 2 antenna ports.
  • each antenna port group contains 8 DMRS ports.
  • the first antenna port group includes DMRS ports 8 to 15, and the second antenna port group includes DMRS ports 0 to 7.
  • DMRS ports 8, 9, 12, and 13 in the first antenna port group correspond to CDM group 0, DMRS ports 10, 11, 14, and 15 in the first antenna port group correspond to CMD group 1; in the second antenna port group DMRS ports 0, 1, 4, and 5 correspond to CDM group 0, and DMRS ports 2, 3, 6, and 7 in the second antenna port group correspond to CDM group 1.
  • the first antenna port group and the second antenna port group correspond to two CDM groups respectively, and the corresponding numbers of the first antenna port group and the second antenna port group are the same.
  • the DMRS corresponding to the DMRS ports belonging to the same CDM group are mapped on the same time-frequency resource.
  • the antenna port indexes corresponding to the antenna ports included in the first antenna port group are I, J, K, L, M, N, O, and the second antenna
  • the antenna port indexes corresponding to the antenna ports included in the port group are A, B, C, D, E, F, G, and H.
  • FIG. 7a it is a schematic diagram of time-frequency resource mapping of single symbol, type 2 DMRS provided by the embodiment of the present application.
  • the maximum number of DMRS ports that can be supported is 12, which is divided into 2 antenna ports.
  • each antenna port group contains 6 DMRS ports.
  • the first antenna port group includes DMRS ports 6 to 11, and the second antenna port group includes DMRS ports 0 to 5.
  • DMRS ports 6 and 7 in the first antenna port group correspond to CDM group 0, DMRS ports 8 and 9 in the first antenna port group correspond to CMD group 1, and DMRS ports 10 and 11 in the first antenna port group correspond to CDM Group 2; DMRS ports 0 and 1 in the second antenna port group correspond to CDM group 0, DMRS ports 2 and 3 in the second antenna port group correspond to CDM group 1, and DMRS ports 4 and 5 in the second antenna port group correspond to CDM Group 2. It can be seen that the first antenna port group and the second antenna port group correspond to three CDM groups respectively, and the corresponding numbers of the first antenna port group and the second antenna port group are the same.
  • the DMRS corresponding to the DMRS ports belonging to the same CDM group in the first antenna port group and the second antenna port group are mapped on the same time-frequency resource.
  • the antenna port indexes corresponding to the antenna ports included in the first antenna port group can also be 12, 13, 14, 15, 16, 17, and the second antenna
  • the antenna port indexes corresponding to the antenna ports included in the port group are 0, 1, 2, 3, 4, and 5.
  • the antenna port indexes corresponding to the antenna ports included in the first antenna port group are G, H, I, J, K, L, and the second antenna port group
  • the antenna port indexes corresponding to the antenna ports contained in are A, B, C, D, E, and F.
  • each antenna port group contains 12 DMRS ports.
  • the first antenna port group includes DMRS ports 12 to 23, and the second antenna port group includes DMRS ports 0 to 11.
  • DMRS ports 12, 13, 18, and 19 in the first antenna port group correspond to CDM group 0, and DMRS ports 14, 15, 20, and 21 in the first antenna port group correspond to CMD group 1.
  • DMRS ports 16, 17, 22, and 23 correspond to CDM group 2; DMRS ports 0, 1, 6, and 7 in the second antenna port group correspond to CDM group 0, and DMRS ports 2, 3, and 8 in the second antenna port group , 9 corresponds to CDM group 1, and DMRS ports 4, 5, 10, and 11 in the second antenna port group correspond to CDM group 2.
  • the first antenna port group and the second antenna port group correspond to three CDM groups respectively, and the corresponding numbers of the first antenna port group and the second antenna port group are the same.
  • the DMRS corresponding to the DMRS ports belonging to the same CDM group in the first antenna port group and the second antenna port group are mapped on the same time-frequency resource.
  • the antenna port indexes corresponding to the antenna ports included in the first antenna port group are M, N, O, P, Q, R, S, T, U
  • the antenna port indexes corresponding to V, W, X, and the antenna ports included in the second antenna port group are A, B, C, D, E, F, G, H, I, J, K, and L.
  • Figure 6a, Figure 6b, Figure 7a and Figure 7b are only examples of the antenna port expansion design of single/dual symbol, type 1/type 2 DMRS, in which the first antenna port group and the second antenna port group
  • the port indexes in are only examples, and there is no strict sequence relationship between the port indexes in the first antenna port group and the second antenna port group.
  • the port index in the second antenna port group may be an existing port index
  • the port index in the first antenna port group may be continuous or discontinuous with the port index in the second antenna port group.
  • the first relationship also includes the number of DMRS code division multiplexing groups that do not map data corresponding to each candidate value of at least one candidate value of the antenna port field in the DCI.
  • the first relationship can be expressed as a DMRS port index table. They are described below:
  • the total number of orthogonal DMRS ports that can be supported after expansion is 8, which in one implementation correspond to DMRS port indexes 0 to 7 respectively.
  • the port index 0 ⁇ 7 here can also represent the DMRS port index 1000 ⁇ 1007.
  • CDM groups CDM group 0 and CDM group 1
  • each CDM group includes 4 DMRS ports, as shown in Figure 6a.
  • CDM group 0 includes DMRS ports 0, 1, 4, and 5 and CDM group 1 includes DMRS ports 2, 3, 6, and 7. It can be seen that the unexpanded DRMS supports a total of 4 DMRS ports, so ranks 5 to 8 cannot be supported.
  • the expanded DMRS can support a total of 8 DMRS ports, so it can support transmission of up to rank 8 with a single symbol.
  • the supported DMRS port index can also be in other value ranges.
  • the eight DMRS ports supported correspond to port indexes 8 to 15, that is, the DMRS port indexes 0 to 7 shown in Tables 19 to 22 can also be expressed as indexes 8 to 15, where each value in index 0 to 7 is the same as index 8
  • Each value in ⁇ 15 has a one-to-one correspondence; or the DMRS port index 0-7 shown in Tables 18-21 can also be expressed as indexes 0-3 and 8-11, that is, the DMRS port index 4 shown in Tables 18-21 -7 can also be expressed as index 8-11, where each value in index 4 to 7 corresponds to each value in index 8 to 11.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 5, that is, rank 5, which can support the transmission of a maximum of 5 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 5 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0-4; the number of preamble symbols is 1 (that is, DMRS ports 0-4 are mapped to 1 symbol).
  • the port index in DMRS port index 0-4 can also be other DMRS port values, such as 0,1,2,3,5; 0,1,2,3,6; or 0,1,2,3, 7.
  • the value of the antenna port being "0" is exemplary and can be any value, which is not limited in this application.
  • rank5 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 6, that is, rank 6, which can support the transmission of a maximum of 6 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 6 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; DMRS port index is 0,1,2,3,4,6; the number of preamble symbols is 1 (that is, DMRS port 0,1,2,3,4,6 is mapped to 1 symbol).
  • the port index in DMRS port index 0,1,2,3,4,6 can also be other DMRS port values, such as 0,1,2,3,4,7; 0,1,2,3,5 ,6; or 0,1,2,3,5,7.
  • the value of the antenna port being "0" is exemplary and can be any value, which is not limited in this application.
  • rank6 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 7, that is, rank 7, which can support the transmission of a maximum of 7 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 7 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0,1,2,3,4,5,6; the number of preamble symbols is 1 (i.e. DMRS port 0,1,2,3,4,5, 6 maps to 1 symbol).
  • the port index in DMRS port index 0,1,2,3,4,5,6 can also be other DMRS port values, such as 0,1,2,3,4,5,7, or 0,1, 2,3,4,6,7, or 0,1,2,3,5,6,7.
  • the value of the antenna port being "0" is exemplary and can be any value, which is not limited in this application.
  • rank7 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 8, that is, rank 8, which can support the transmission of a maximum of 8 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 8 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0,1,2,3,4,5,6,7; the number of prefix symbols is 1 (i.e. DMRS port 0,1,2,3,4, 5,6,7 map to 1 symbol).
  • the port indexes in DMRS port indexes 0, 1, 2, 3, 4, 5, 6, and 7 can also be other DMRS port values.
  • the value of the antenna port being "0" is exemplary and can be any value, which is not limited in this application.
  • rank8 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the total number of orthogonal DMRS ports that can be supported after expansion is 16. In one implementation, they correspond to DMRS port indexes 0 to 15 respectively. It should be noted that the port index 0 ⁇ 15 here can also represent the DMRS port index 1000 ⁇ 1015.
  • CDM groups CDM group 0 and CDM group 1
  • each CDM group includes 8 DMRS ports, as shown in Figure 6b.
  • CDM group 0 includes DMRS ports 0, 1, 4, 5, 8, 9, 12, and 13, and CDM group 1 includes DMRS ports 2, 3, 6, 7, 10, 11, 14, and 15. It can be seen that for unexpanded DRMS, a CDM group supports a total of 4 DMRS ports, and 2 CDM groups are required to support ranks 5 to 8. For expanded DMRS, one CDM group supports a total of 8 DMRS ports, and only one CDM group can support transmission of up to rank 8. In an implementation manner, after DMRS capacity expansion, the supported DMRS port index can also be in other value ranges.
  • the 16 DMRS ports supported correspond to port indexes 8 to 23, that is, the DMRS port indexes 0 to 15 shown in Tables 23 to 26 can also be expressed as indexes 8 to 23, where each value in index 0 to 15 is the same as index 8 Each value in ⁇ 23 has a one-to-one correspondence; or the 16 DMRS ports supported correspond to port indexes 0 ⁇ 7 and 8 ⁇ 15 respectively.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 5, that is, rank 5, which can support the transmission of a maximum of 5 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 5 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0-4; the number of preamble symbols is 2 (that is, DMRS ports 0-4 are mapped to 2 symbols).
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 5 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency position corresponding to the remaining CDM group can be Used for mapping data; DMRS port index is 0,1,4,5,8; the number of prefix symbols is 2 (that is, DMRS ports 0,1,4,5,8 are mapped to 2 symbols). It can be seen that rank5 is supported, and the number of prefix symbols it occupies is 2, but only 1 CDM group is used, reducing resource requirements.
  • DMRS port index 0,1,4,5,8 can also be other DMRS port values, such as 0,1,4,5,9; 0,1,4,5,12; 0,1,4,5 ,13;2,3,6,7,10;2,3,6,7,11;2,3,6,7,14;2,3,6,7,15.
  • the value of the antenna port is "2", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 5 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0-4; the number of prefix symbols is 1 (that is, DMRS ports 0-4 are mapped to 1 symbol). It can be seen that rank5 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the port index in DMRS port index 0-4 can also be other DMRS port values, such as 0,1,2,3,5; 0,1,2,3,6; or 0,1,2,3 ,7.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table can contain all rows corresponding to the above values "0", “1", and “2", or it can contain one or more of the above values "0", “1", and “2" corresponding row.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 6, that is, rank 6, which can support the transmission of a maximum of 6 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 6 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0,1,2,3,4,6; the number of preamble symbols is 2 (that is, DMRS port 0,1,2,3,4,6 is mapped to 2 symbol).
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 6 configured DMRS antenna ports are divided into 1 CDM group, and the time and frequency corresponding to the remaining CDM group Resources can be used to map data; DMRS port indexes are 0,1,4,5,8,9; the number of prefix symbols is 2 (that is, DMRS ports 0,1,4,5,8,9 are mapped to 2 symbols superior). It can be seen that rank6 is supported, and the number of prefix symbols it occupies is 2, but only one CDM group is used, which reduces resource requirements.
  • the port index in DMRS port index 0,1,4,5,8,9 can also be other DMRS port values, such as 0,1,4,5,12,13; 0,1,4,5,8 ,12;0,1,4,5,9,13;or 2,3,6,7,10,11;2,3,6,7,14,15;2,3,6,7,10, 14;2,3,6,7,11,15.
  • the value of the antenna port is "2", which is used to indicate that the number of DMRS CDM groups that do not map data is 2.
  • the configured 6 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,6; the number of prefix symbols is 1 (that is, DMRS ports 0,1,2,3,4,6 are mapped to 1 symbol). It can be seen that rank6 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the port index in DMRS port index 0,1,2,3,4,6 can also be other DMRS port values, such as 0,1,2,3,4,7; 0,1,2,3,5 ,6; or 0,1,2,3,5,7.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table can contain all rows corresponding to the above values "0", “1", and “2", or it can contain one or more of the above values "0", “1", and “2" corresponding row.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 7, that is, rank 7, which can support the transmission of a maximum of 7 streams.
  • the value of the antenna port is "0", which is used to indicate that: the number of DMRS CDM groups that do not map data is 2, the configured 7 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0,1,2,3,4,5,6; the number of preamble symbols is 2 (that is, DMRS port 0,1,2,3,4,5, 6 maps to 2 symbols).
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 7 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining CDM group can Used to map data; DMRS port index is 0,1,4,5,8,9,12; the number of prefix symbols is 2 (that is, DMRS port 0,1,4,5,8,9,12 is mapped to 2 symbol). It can be seen that rank7 is supported, and the number of prefix symbols it occupies is 2, but only 1 CDM group is used, reducing resource requirements.
  • the port index in DMRS port index 0,1,4,5,8,9,12 can also be other DMRS port values, such as 0,1,4,5,8,9,13; 0,1,4 ,5,8,12,13; 0,1,4,5,9,12,13; or 2,3,6,7,10,11,14; 2,3,6,7,10,11, 15;2,3,6,7,10,14,15;2,3,6,7,11,14,15.
  • the value of the antenna port is "2", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 7 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6
  • the number of prefix symbols is 1 (that is, DMRS port 0,1,2,3,4,5,6 is mapped to 1 symbol). It can be seen that rank6 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the port index in DMRS port index 0,1,2,3,4,5,6 can also be other DMRS port values, such as 0,1,2,3,4,5,7, or 0,1, 2,3,4,6,7, or 0,1,2,3,5,6,7.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table can contain all rows corresponding to the above values "0", “1", and “2", or it can contain one or more of the above values "0", “1", and “2" corresponding row.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 8, that is, rank 8, which can support the transmission of a maximum of 8 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 8 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0,1,2,3,4,5,6,7; the number of preamble symbols is 2 (that is, DMRS port 0,1,2,3,4, 5,6,7 map to 2 symbols).
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 8 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining CDM group can Used to map data; DMRS port index is 0,1,4,5,8,9,12,13; the number of prefix symbols is 2 (i.e. DMRS port 0,1,4,5,8,9,12, 13 maps to 2 symbols). It can be seen that rank8 is supported, and the number of prefix symbols it occupies is 2, but only one CDM group is used, which reduces resource requirements.
  • the port index in DMRS port index 0,1,4,5,8,9,12,13 can also be other DMRS port values, such as 2,3,6,7,10,11,14,15.
  • the value of the antenna port is "2", which is used to indicate that the number of DMRS CDM groups that do not map data is 2.
  • the configured 8 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6,7; the number of prefix symbols is 1 (i.e. DMRS port 0,1,2,3,4,5,6,7 mapped to 1 symbol). It can be seen that rank7 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table can contain all rows corresponding to the above values "0", “1", and “2", or it can contain one or more of the above values "0", “1", and “2" corresponding row.
  • the total number of orthogonal DMRS ports that can be supported after expansion is 12. In one implementation, they correspond to DMRS port indexes 0 to 11 respectively. It should be noted that the port index 0 ⁇ 11 here can also represent the DMRS port index 1000 ⁇ 1011.
  • type 2 DMRS there are 3 CDM groups: CDM group 0, CDM group 1 and CDM group 2, and each CDM group includes 4 DMRS ports, as shown in Figure 7a.
  • CDM group 0 includes DMRS ports 0, 1, 6, and 7
  • CDM group 1 includes DMRS ports 2, 3, 8, and 9,
  • CDM group 2 includes DMRS ports 4, 5, 10, and 11.
  • a CDM group supports a total of 2 DMRS ports, so it cannot support ranks 5 to 8.
  • rank 5 ⁇ 6 In order to support rank 5 ⁇ 6, at least 3 CDM groups are required.
  • one CDM group supports a total of 4 DMRS ports, so 3 CDM groups with a single symbol can support transmission of up to rank 8.
  • the supported DMRS port index can also be in other value ranges.
  • the 12 DMRS ports supported correspond to port indexes 12 to 23, that is, the DMRS port indexes 0 to 11 shown in Tables 27 to 30 can also be expressed as indexes 12 to 23, where each value in index 0 to 11 is the same as index 12
  • Each value in ⁇ 23 has a one-to-one correspondence; or the 12 supported DMRS ports correspond to port indexes 0 ⁇ 5 and 12 ⁇ 17 respectively, that is, the DMRS port indexes 6 ⁇ 11 shown in Tables 26 ⁇ 29 can also be expressed as index 12 ⁇ 17, where each value in indexes 6 to 11 corresponds to each value in indexes 12 to 17.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 5, that is, rank 5, which can support the transmission of a maximum of 5 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 3, the configured 5 DMRS antenna ports belong to 3 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0-4; the number of preamble symbols is 1 (that is, DMRS ports 0-4 are mapped to 1 symbol). It can be seen that rank5 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the port index in DMRS port index 0-4 can also be other DMRS port values, such as 0,1,2,3,5.
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 5 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining CDM group can Used for mapping data; DMRS port index is 0,1,2,3,6; the number of prefix symbols is 1 (that is, DMRS ports 0,1,2,3,6 are mapped to 1 symbol). It can be seen that rank5 is supported, the number of prefix symbols it occupies is 1, and only 2 CDM groups are used, which reduces resource requirements; and it only needs to be mapped to 1 symbol, reducing symbol overhead.
  • the port index in DMRS port index 0,1,2,3,6 can also be other DMRS port values, such as 0,1,2,3,7; 0,1,2,3,8; 0,1 ,2,3,9.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table may contain all the rows corresponding to the above values "0" and “1", or it may contain rows corresponding to one or more of the above values "0" or "1".
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 6, that is, rank 6, which can support the transmission of a maximum of 6 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 3, the configured 6 DMRS antenna ports belong to 3 CDM groups, and there are no additional CDM groups corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0-5; the number of preamble symbols is 1 (that is, DMRS ports 0-5 are mapped to 1 symbol). It can be seen that rank6 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 6 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resource corresponding to the remaining CDM group is available Based on the mapping data; DMRS port index is 0,1,2,3,6,8; the number of prefix symbols is 1 (that is, DMRS ports 0,1,2,3,6,8 are mapped to 1 symbol). It can be seen that rank6 is supported, the number of prefix symbols occupied is 1, and only 2 CDM groups are used, which reduces resource requirements; and it only needs to be mapped to 1 symbol, reducing symbol overhead.
  • the port index in DMRS port index 0,1,2,3,6,8 can also be other DMRS port values, such as 0,1,2,3,7,9; 0,1,2,3,6 ,7;0,1,2,3,8,9.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table may contain all the rows corresponding to the above values "0" and “1", or it may contain rows corresponding to one or more of the above values "0" or "1".
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 7, that is, rank 7, which can support the transmission of a maximum of 7 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 3, the 7 configured DMRS antenna ports belong to 3 CDM groups, and there are no additional CDM groups corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0,1,2,3,4,5,6; the number of preamble symbols is 1 (i.e. DMRS port 0,1,2,3,4,5, 6 maps to 1 symbol). It can be seen that rank7 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the port index in DMRS port index 0,1,2,3,4,5,6 can also be other DMRS port values, such as 0,1,2,3,4,5,7; 0,1,2 ,3,4,5,8;0,1,2,3,4,5,9;0,1,2,3,4,5,10;0,1,2,3,4,5,11 .
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 7 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining CDM group are available Based on the mapping data; DMRS port index is 0,1,2,3,6,7,8; the number of prefix symbols is 1 (that is, DMRS port 0,1,2,3,6,7,8 is mapped to 1 symbol). It can be seen that rank7 is supported, the number of prefix symbols occupied is 1, and only 2 CDM groups are used, which reduces resource requirements; and it only needs to be mapped to 1 symbol, reducing symbol overhead.
  • the port index in DMRS port index 0,1,2,3,6,7,8 can also be other DMRS port values, such as 0,1,2,3,6,7,9; 0,1,2 ,3,6,8,9;0,1,2,3,7,8,9.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table may contain all the rows corresponding to the above values "0" and “1", or it may contain rows corresponding to one or more of the above values "0" or "1".
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 8, that is, rank 8, which can support the transmission of a maximum of 8 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 3, the configured 8 DMRS antenna ports belong to 3 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0,1,2,3,4,5,6,8; the number of preamble symbols is 1 (i.e. DMRS port 0,1,2,3,4, 5,6,8 are mapped to 1 symbol). It can be seen that rank8 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the port index in DMRS port index 0,1,2,3,4,5,6,8 can also be other DMRS port values, such as 0,1,2,3,4,5,7,9; 0 ,1,2,3,4,5,8,10;0,1,2,3,4,5,9,11;0,1,2,3,4,5,6,10;0,1 ,2,3,4,5,7,11.
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 8 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining CDM group are available For mapping data; DMRS port index is 0,1,2,3,6,7,8,9; the number of prefix symbols is 1 (i.e. DMRS port 0,1,2,3,6,7,8,9 mapped to 1 symbol). It can be seen that rank8 is supported, and the number of prefix symbols it occupies is 1, but only 2 CDM groups are used, which reduces resource requirements; and it only needs to be mapped to 1 symbol, reducing symbol overhead.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table may contain all the rows corresponding to the above values "0" and “1", or it may contain rows corresponding to one or more of the above values "0" or "1".
  • the total number of orthogonal DMRS ports that can be supported after expansion is 24, which correspond to DMRS port indexes 0 to 23 in one implementation.
  • the port index 0 ⁇ 23 here can also represent the DMRS port index 1000 ⁇ 1023.
  • CDM group 0 for dual-symbol, type 2 DMRS, there are 3 CDM groups: CDM group 0, CDM group 1 and CDM group 2, and each CDM group includes 8 DMRS ports, as shown in Figure 7b.
  • CDM group 0 includes DMRS ports 0, 1, 6, 7, 12, 13, 18, and 19
  • CDM group 1 includes DMRS ports 2, 3, 8, 9, 14, 15, 20, and 21,
  • CDM group 2 includes DMRS ports. Ports 4, 5, 10, 11, 16, 17, 22, 23. It can be seen that for unexpanded DRMS, a CDM group supports a total of 4 DMRS ports, so at least 2 CDM groups are required to support ranks 5 to 8. For expanded DMRS, one CDM group supports a total of 8 DMRS ports, so one CDM group can support transmission of up to rank 8. In an implementation manner, after DMRS capacity expansion, the supported DMRS port index can also be in other value ranges.
  • the 24 DMRS ports supported correspond to port indexes 12 to 35, that is, the DMRS port indexes 0 to 23 shown in Tables 31 to 34 can also be expressed as indexes 12 to 35, where each value in index 0 to 23 is the same as index 12 Each value in ⁇ 35 has a one-to-one correspondence; or the 24 supported DMRS ports correspond to port indexes 0 ⁇ 11 and 12 ⁇ 23 respectively.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 5, that is, rank 5, which can support the transmission of a maximum of 5 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 3, the configured 5 DMRS antenna ports belong to 3 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0-4; the number of preamble symbols is 1 (that is, DMRS ports 0-4 are mapped to 1 symbol). It can be seen that rank5 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 5 DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining CDM group are available Based on the mapping data; DMRS port index is 0,1,2,3,6; the number of prefix symbols is 2 (that is, DMRS ports 0,1,2,3,6 are mapped to 2 symbols). It can be seen that rank5 is supported, and the number of prefix symbols it occupies is 2, but only 2 CDM groups are used, reducing resource requirements.
  • the value of the antenna port is "2", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 5 DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining CDM group are available Based on the mapping data; DMRS port index is 0,1,2,3,6; the number of prefix symbols is 1 (that is, DMRS ports 0,1,2,3,6 are mapped to 1 symbol). It can be seen that rank5 is supported, the number of prefix symbols it occupies is 1, and only 2 CDM groups are used, which reduces resource requirements; and it only needs to be mapped to 1 symbol, reducing symbol overhead.
  • the port index in DMRS port index 0,1,2,3,6 can also be other DMRS port values, such as 0,1,2,3,7; 0,1,2,3,8; 0,1 ,2,3,9.
  • the value of the antenna port is "3", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 5 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 2 CDM groups Can be used to map data; DMRS port index is 0,1,6,7,12; The number of preamble symbols is 2 (that is, DMRS ports 0, 1, 6, 7, and 12 are mapped to 2 symbols). It can be seen that rank5 is supported, and the number of prefix symbols it occupies is 2, but only 1 CDM group is used, reducing resource requirements.
  • the port index in DMRS port index 0,1,6,7,12 can also be other DMRS port values, such as 0,1,6,7,13; 0,1,6,7,18; 0,1 ,6,7,19.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table can contain all the rows corresponding to the above values "0", “1", “2” and “3", or it can also contain the above values "0", “1", “2” and “3".
  • the row corresponding to one or more values of .
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 6, that is, rank 6, which can support the transmission of a maximum of 6 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 3, the configured 6 DMRS antenna ports belong to 3 CDM groups, and there are no additional CDM groups corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0-5; the number of preamble symbols is 1 (that is, DMRS ports 0-5 are mapped to 1 symbol). It can be seen that rank6 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 6 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resource corresponding to the remaining CDM group is available Based on the mapping data; DMRS port index is 0,1,2,3,6,8; the number of prefix symbols is 2 (that is, DMRS port 0,1,2,3,6,8 is mapped to 2 symbols). It can be seen that rank6 is supported, and the number of prefix symbols it occupies is 2, but only 2 CDM groups are used, reducing resource requirements.
  • the value of the antenna port is "2", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 6 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining CDM group are available Based on the mapping data; DMRS port index is 0,1,2,3,6,8; the number of prefix symbols is 1 (that is, DMRS ports 0,1,2,3,6,8 are mapped to 1 symbol). It can be seen that rank6 is supported, the number of prefix symbols occupied is 1, and only 2 CDM groups are used, which reduces resource requirements; and it only needs to be mapped to 1 symbol, reducing symbol overhead.
  • the port index in DMRS port index 0,1,2,3,6,8 can also be other DMRS port values, such as 0,1,2,3,7,9; 0,1,2,3,6 ,7;0,1,2,3,8,9.
  • the value of the antenna port is "3", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 6 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 2 CDM groups Can be used to map data; DMRS port index is 0,1,6,7,12,13; the number of prefix symbols is 2 (that is, DMRS port 0,1,6,7,12,13 is mapped to 2 symbols) . It can be seen that rank6 is supported, and the number of prefix symbols it occupies is 2, but only one CDM group is used, which reduces resource requirements.
  • the port index in DMRS port index 0,1,6,7,12,13 can also be other DMRS port values, such as 0,1,6,7,18,19; 0,1,6,7,12 ,18;0,1,6,7,13,19;0,1,6,7,12,19;0,1,6,7,13,18.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table can contain all the rows corresponding to the above values "0", “1", “2” and “3", or it can also contain the above values "0", “1", “2” and “3".
  • the row corresponding to one or more values of .
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 7, that is, rank 7, which can support the transmission of a maximum of 7 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 7 configured DMRS antenna ports belong to 2 CDM groups, and the remaining time-frequency resources are available Based on the mapping data; DMRS port index is 0,1,2,3,6,7,8; the number of prefix symbols is 2 (that is, DMRS port 0,1,2,3,6,7,8 is mapped to 2 symbol).
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 7 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining CDM group are available Based on the mapping data; DMRS port index is 0,1,2,3,6,7,8; the number of prefix symbols is 1 (that is, DMRS port 0,1,2,3,6,7,8 is mapped to 1 symbol). It can be seen that rank7 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead.
  • the port index in DMRS port index 0,1,2,3,6,7,8 can also be other DMRS port values, such as 0,1,2,3,6,7,9; 0,1,2 ,3,6,8,9;0,1,2,3,7,8,9.
  • the value of the antenna port is "2", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 7 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 2 CDM groups Can be used to map data; DMRS port index is 0,1,6,7,12,13,18; the number of prefix symbols is 2 (that is, DMRS port 0,1,6,7,12,13,18 is mapped to 2 symbol). It can be seen that rank7 is supported, and the number of prefix symbols it occupies is 2, but only 1 CDM group is used, reducing resource requirements.
  • the port index in DMRS port index 0,1,6,7,12,13,18 can also be other DMRS port values, such as 0,1,6,7,12,13,19; 0,1,6 ,7,12,18,19;0,1,6,7,13,18,19.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table can contain all rows corresponding to the above values "0", “1", and “2", or it can contain one or more of the above values "0", “1", and “2" corresponding row.
  • the DMRS port index table can be used for uplink/downlink transmission.
  • N 8, that is, rank 8, which can support the transmission of a maximum of 8 streams.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 8 configured DMRS antenna ports belong to 2 CDM groups, and the remaining time-frequency resources are available For mapping data; DMRS port index is 0,1,2,3,6,7,8,9; the number of prefix symbols is 2 (i.e. DMRS port 0,1,2,3,6,7,8,9 mapped to 2 symbols). It can be seen that rank8 is supported, and the number of prefix symbols it occupies is 2, but only 2 CDM groups are used, reducing resource requirements.
  • the value of the antenna port is "1", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 8 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining CDM group are available Based on the mapping data; DMRS port index is 0,1,2,3,6,7,8; the number of prefix symbols is 1 (that is, DMRS port 0,1,2,3,6,7,8 is mapped to 1 symbol). It can be seen that rank8 is supported, but it only needs to be mapped to one symbol, which reduces the symbol overhead; and only two CDM groups are used, which reduces resource requirements.
  • the value of the antenna port is "2", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 8 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 2 CDM groups Can be used to map data; DMRS port index is 0,1,6,7,12,13,18,19; the number of prefix symbols is 2 (i.e. DMRS port 0,1,6,7,12,13,18, 19 maps to 2 symbols). It can be seen that rank8 is supported, and the number of prefix symbols it occupies is 2, but only one CDM group is used, which reduces resource requirements.
  • the table can contain all rows corresponding to the above values "0", “1", and “2", or it can contain one or more of the above values "0", “1", and “2" corresponding row.
  • the DMRS port index table corresponding to single symbol and type 1 can also be shown in Table 35 below:
  • This table can be used for port indication of downlink DMRS transmission.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 5 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding The time and frequency resources are used for mapping data; the DMRS port index is 0-4.
  • the value of the antenna port is "1", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 6 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,6.
  • the value of the antenna port is "2", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 7 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6.
  • the value of the antenna port is "3", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 8 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6,7.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table can contain all the rows corresponding to the above values "0", “1”, “2”, and “3", or it can also contain the above values "0", “1”, “2”, and “3” The row corresponding to one or more values in .
  • the DMRS port index table for dual symbols and type 2 can also be shown in Table 36 below:
  • This table can be used for port indication of downlink DMRS transmission.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the configured 5 DMRS antenna ports belong to 2 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0-4; the number of preamble symbols is 2 (that is, DMRS ports 0-4 are mapped to 2 symbols).
  • the value of the antenna port is "1", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 6 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,6; the number of prefix symbols is 2 (that is, DMRS port 0,1,2,3,4,6 is mapped to 2 symbols).
  • the value of the antenna port is "2", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, and the configured 7 DMRS antennas
  • the port belongs to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group for mapping data; the DMRS port index is 0,1,2,3,4,5,6; the number of preamble symbols is 2 (that is, DMRS Ports 0,1,2,3,4,5,6 are mapped to 2 symbols).
  • the value of the antenna port is "3", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 8 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6,7; the number of prefix symbols is 2 (i.e. DMRS port 0,1,2,3,4,5,6,7 mapped to 2 symbols).
  • the value of the antenna port is "4", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 5 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,4,5,8; the number of prefix symbols is 2 (that is, DMRS ports 0,1,4,5,8 are mapped to 2 symbols). It can be seen that rank5 is supported, but only one CDM group is used, which reduces resource requirements.
  • the value of the antenna port is "5", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 6 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,4,5,8,9; the number of prefix symbols is 2 (that is, DMRS port 0,1,4,5,8,9 is mapped to 2 symbols ). It can be seen that rank6 is supported, but only one CDM group is used, which reduces resource requirements.
  • the value of the antenna port is "6", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 7 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,4,5,8,9,12, and the number of prefix symbols is 2 (that is, DMRS port 0,1,4,5,8,9,12 is mapped to 2 symbols on). It can be seen that rank7 is supported, but only one CDM group is used, which reduces resource requirements.
  • the value of the antenna port is "7", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 8 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,4,5,8,9,12,13; the number of prefix symbols is 2 (i.e. DMRS port 0,1,4,5,8,9,12 ,13 maps to 2 symbols). It can be seen that rank8 is supported, but only one CDM group is used, which reduces resource requirements.
  • the value of the antenna port is "8", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 5 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0-4; the number of prefix symbols is 1 (that is, DMRS ports 0-4 are mapped to 1 symbol). It can be seen that rank5 is supported, but it is only mapped to 1 symbol, reducing symbol overhead.
  • the value of the antenna port is "9", which is used to indicate that the number of DMRS CDM groups that do not map data is 2.
  • the configured 6 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,6; the number of prefix symbols is 1 (that is, DMRS ports 0,1,2,3,4,6 are mapped to 1 symbol). It can be seen that rank6 is supported, but it is only mapped to 1 symbol, which reduces symbol overhead.
  • the value of the antenna port is "10", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 7 configured DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6; the number of prefix symbols is 1 (that is, DMRS port 0,1,2,3,4,5,6 is mapped to 1 symbol). It can be seen that rank6 is supported, but it is only mapped to 1 symbol, which reduces symbol overhead.
  • the value of the antenna port is "11", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, the configured 8 DMRS antenna ports belong to 2 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6,7; the number of prefix symbols is 1 (i.e. DMRS port 0,1,2,3,4,5,6,7 mapped to 1 symbol). It can be seen that rank8 is supported, but it is only mapped to 1 symbol, which reduces symbol overhead.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table may include all rows corresponding to the above-mentioned values from “0” to “11”, or may include rows corresponding to one or more of the above-mentioned values from “0” to “11”.
  • the DMRS port index table for single symbol and type 2 can also be shown in Table 37 below:
  • This table can be used for port indication of downlink DMRS transmission.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 3, the configured 5 DMRS antenna ports belong to 3 CDM groups, and there is no additional CDM group corresponding The time and frequency resources are used for mapping data; the DMRS port index is 0-4.
  • the value of the antenna port is "1", which is used to indicate that the number of DMRS CDM groups that do not map data is 3.
  • the configured 6 DMRS antenna ports belong to 3 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0-5.
  • the value of the antenna port is "2", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 5 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6. It can be seen that rank5 is supported, but only 2 CDM groups are occupied, reducing resource requirements.
  • the value of the antenna port is "3", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 6 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6,8. It can be seen that rank6 is supported, but only 2 CDM groups are occupied, reducing resource requirements.
  • the value of the antenna port is "4", which is used to indicate that the number of DMRS CDM groups that do not map data is 3, that is, the 7 configured DMRS antenna ports belong to 3 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6.
  • the value of the antenna port is "5", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, that is, the 7 configured DMRS antenna ports belong to 2 CDM groups, and the remaining 1 CDM group corresponds to the time frequency Resources can be used to map data; DMRS port indexes are 0,1,2,3,6,7,8. It can be seen that rank7 is supported, but only 2 CDM groups are occupied, reducing resource requirements.
  • the value of the antenna port is "6", which is used to indicate that the number of DMRS CDM groups that do not map data is 3, the configured 8 DMRS antenna ports belong to 3 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • DMRS port index is 0,1,2,3,4,5,6,8.
  • the value of the antenna port is "7", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 8 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6,7,8,9. It can be seen that rank8 is supported, but only 2 CDM groups are occupied, reducing resource requirements.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table may include all rows corresponding to the above-mentioned values from “0” to “8”, or may include rows corresponding to one or more of the above-mentioned values from “0” to “8”.
  • the DMRS port index table for dual symbols and type 2 can also be shown in Table 38 below:
  • This table can be used for port indication of downlink DMRS transmission.
  • the value of the antenna port is "0", which is used to indicate: the number of DMRS CDM groups that do not map data is 3, the configured 5 DMRS antenna ports belong to 3 CDM groups, and there is no additional CDM group corresponding
  • the time-frequency resources are used for mapping data; the DMRS port index is 0-4; the number of preamble symbols is 1 (that is, DMRS ports 0-4 are mapped to 1 symbol). It can be seen that rank5 is supported, but it is only mapped to 1 symbol, reducing symbol overhead.
  • the value of the antenna port is "1", which is used to indicate that the number of DMRS CDM groups that do not map data is 3.
  • the configured 6 DMRS antenna ports belong to 3 CDM groups, and there are no additional time-frequency resources corresponding to the CDM group.
  • mapping data DMRS port index is 0-5; the number of prefix symbols is 1 (that is, DMRS ports 0-5 are mapped to 1 symbol). It can be seen that rank6 is supported, but it is only mapped to 1 symbol, which reduces symbol overhead.
  • the value of the antenna port is "2", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 5 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6; the number of prefix symbols is 2 (that is, DMRS ports 0,1,2,3,6 are mapped to 2 symbols). It can be seen that rank5 is supported, but only two CDM groups are occupied, reducing resource requirements.
  • the value of the antenna port is "3", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 6 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6,8; the number of prefix symbols is 2 (that is, DMRS port 0,1,2,3,6,8 is mapped to 2 symbols ). It can be seen that rank6 is supported, but only two CDM groups are occupied, reducing resource requirements.
  • the value of the antenna port is "4", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 7 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6,7,8; the number of prefix symbols is 2 (that is, DMRS port 0,1,2,3,6,7,8 is mapped to 2 symbols on). It can be seen that rank7 is supported, but only 2 CDM groups are used, reducing resource requirements.
  • the value of the antenna port is "5", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 8 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6,7,8,9; the number of prefix symbols is 2 (i.e. DMRS port 0,1,2,3,6,7,8 ,9 maps to 2 symbols). It can be seen that rank8 is supported, but only 2 CDM groups are used, reducing resource requirements.
  • the value of the antenna port is "6", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 5 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6; the number of prefix symbols is 1 (that is, DMRS ports 0,1,2,3,6 are mapped to 1 symbol). It can be seen that rank7 is supported, but only one CDM group is used, which reduces resource requirements; and the DMRS port is only mapped to one symbol, which reduces symbol overhead.
  • the value of the antenna port is "7", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 5 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 2 CDM groups Can be used to map data; DMRS port index is 0,1,6,7,12, and the number of prefix symbols is 2 (that is, DMRS ports 0,1,6,7,12 are mapped to 2 symbols). It can be seen that rank8 is supported, but only one CDM group is used, which reduces resource requirements.
  • the value of the antenna port is "8", which is used to indicate that the number of DMRS CDM groups that do not map data is 2, that is, the configured 6 DMRS antenna ports belong to 2 CDM groups, and the remaining 1 CDM group corresponds to the time frequency Resources can be used to map data; DMRS port indexes are 0,1,2,3,6,8; the number of prefix symbols is 1 (that is, DMRS ports 0,1,2,3,6,8 are mapped to 1 symbol superior). It can be seen that rank5 is supported, but it is only mapped to one symbol, which reduces symbol overhead; and only two CDM groups are used, which reduces resource requirements.
  • the value of the antenna port is "9", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 6 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 2 CDM groups Can be used to map data; DMRS port index is 0,1,6,7,12,13; the number of prefix symbols is 2 (that is, DMRS port 0,1,6,7,12,13 is mapped to 2 symbols ). It can be seen that rank6 is supported, but only one CDM group is used, which reduces resource requirements.
  • the value of the antenna port is "10", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, and the configured 7 DMRS days
  • the line port belongs to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group can be used for mapping data; the DMRS port index is 0,1,2,3,6,7,8; the number of prefix symbols is 1 (That is, DMRS ports 0,1,2,3,6,7,8 are mapped to 1 symbol). It can be seen that rank7 is supported, but it is only mapped to one symbol, which reduces symbol overhead; and only two CDM groups are used, which reduces resource requirements.
  • the value of the antenna port is "11", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 7 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 2 CDM groups Can be used to map data; DMRS port index is 0,1,6,7,12,13,18; the number of prefix symbols is 2 (that is, DMRS port 0,1,6,7,12,13,18 is mapped to 2 symbols on). It can be seen that rank7 is supported, but only one CDM group is used, which reduces resource requirements.
  • the value of the antenna port is "12", which is used to indicate: the number of DMRS CDM groups that do not map data is 2, the 8 configured DMRS antenna ports belong to 2 CDM groups, and the time-frequency resources corresponding to the remaining 1 CDM group Can be used to map data; DMRS port index is 0,1,2,3,6,7,8,9; the number of prefix symbols is 1 (i.e. DMRS port 0,1,2,3,6,7,8 ,9 maps to 1 symbol). It can be seen that rank8 is supported, but it is only mapped to one symbol, which reduces symbol overhead; and only two CDM groups are used, which reduces resource requirements.
  • the value of the antenna port is "13", which is used to indicate: the number of DMRS CDM groups that do not map data is 1, the 8 configured DMRS antenna ports belong to 1 CDM group, and the time-frequency resources corresponding to the remaining 2 CDM groups Can be used to map data; DMRS port index is 0,1,6,7,12,13,18,19; the number of prefix symbols is 2 (i.e. DMRS port 0,1,6,7,12,13,18 ,19 maps to 2 symbols). It can be seen that rank8 is supported, but only one CDM group is used, which reduces resource requirements.
  • the value of the above antenna port is exemplary and can be any value, which is not limited in this application.
  • the table may include all rows corresponding to the above-mentioned values from “0” to “13”, or may include rows corresponding to one or more of the above-mentioned values from “0” to “13”.
  • DMRS port index 1000 + DMRS port.
  • the network device sends DCI.
  • the DCI includes an antenna port field, and the antenna port field is used to indicate one of at least one candidate value of the antenna port field in the DCI.
  • the network equipment allocates the DMRS antenna port number for demodulating PUSCH/PDSCH to the terminal.
  • the network device can also calculate the DMRS puncturing positions corresponding to the scheduled position of the terminal in this time slot that cannot be used to transmit PUSCH/PDSCH, that is, the number of DMRS code division multiplexing groups that do not map data.
  • the terminal After receiving the DCI, the terminal determines the antenna port corresponding to the indicated value based on the indicated value.
  • the terminal After the terminal detects the DCI carried in the PDCCH through blind detection, it parses and obtains the value of the antenna port field.
  • the terminal determines the first relationship in one of the tables in Table 19 to Table 38 as mentioned above, and determines based on a value indicated by the antenna port field carried in the DCI.
  • the antenna port corresponding to one of the indicated values determines the corresponding row of the table.
  • the network device sends the DMRS corresponding to the determined antenna port.
  • the terminal receives the DMRS corresponding to the determined antenna port.
  • the network equipment After the network equipment and terminal determine the DMRS antenna port, the network equipment generates the corresponding DMRS signal according to the DMRS signal generation method agreed in the protocol, performs time-frequency resource mapping according to the preset method, and sends the corresponding antenna port DMRS, and the DMRS corresponding to the terminal receiving antenna port.
  • the DMRS corresponding to the antenna port is used to demodulate the data corresponding to the antenna port.
  • DMRS port indication method provided by an embodiment of the present application, indication of DMRS antenna ports greater than 4 streams is realized.
  • the DMRS port indication method is described above. This method can also be used for other reference signals such as sounding reference signal (sounding reference signal, SRS), channel state information-reference signal (channel state information-reference signal, CSI-RS), etc. port indication, this application does not limit this.
  • sounding reference signal sounding reference signal
  • SRS sounding reference signal
  • channel state information-reference signal channel state information-reference signal
  • CSI-RS channel state information-reference signal
  • the terminal and the network device include corresponding hardware structures and/or software modules for executing each function.
  • the units and method steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software driving the hardware depends on the specific application scenarios and design constraints of the technical solution.
  • FIGS 8-11 are schematic structural diagrams of possible DMRS port indication devices provided by embodiments of the present application. These DMRS port indication devices can be used to implement the functions of the terminal or network equipment in the above method embodiments, and therefore can also achieve the beneficial effects of the above method embodiments.
  • FIG. 8 it is a schematic structural diagram of a DMRS port indication device 800 provided by an embodiment of the present application.
  • the DMRS port indication device 800 includes a transceiver unit 801 and a processing unit 802 .
  • the transceiver unit 801 is used to perform the functions performed by the terminal in steps S503 and S505 of the embodiment shown in Figure 5; processing Unit 802 is used to perform steps S501, S502 and S504 of the embodiment shown in Figure 5.
  • the transceiver unit 801 is used to perform the functions performed by the network device in steps S503 and S505 of the embodiment shown in Figure 5.
  • DMRS port indication device provided by an embodiment of the present application, indication of DMRS antenna ports of more than 4 streams is realized.
  • Figure 9 shows a simplified structural diagram of a terminal.
  • a mobile phone is used as an example of the terminal.
  • the terminal includes a processor, memory, radio frequency circuit, antenna and input and output devices.
  • the processor is mainly used to process communication protocols and communication data, control the terminal, execute software programs, process data of software programs, etc.
  • Memory is mainly used to store software programs and data.
  • Radio frequency circuits are mainly used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals.
  • Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. For example, some types of terminals may not have input and output devices.
  • the processor When sending data, the processor performs baseband processing on the data to be sent and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal out in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor.
  • the processor converts the baseband signal into data and processes the data.
  • Only one memory and processor are shown in Figure 9. In an actual end product, there may be one or more processors and one or more memories. Memory can also be called storage media or storage devices.
  • the memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.
  • the antenna and the radio frequency circuit with the transceiver function can be regarded as the receiving unit and the transmitting unit of the terminal (which can also be collectively referred to as the transceiver unit), and the processor with the processing function can be regarded as the processing unit of the terminal.
  • the terminal includes a transceiver unit 901 and a processing unit 902.
  • the transceiver unit 901 may also be called a receiver/transmitter (transmitter), a receiver/transmitter, a receive/transmit circuit, etc.
  • the processing unit 902 may also be called a processor, a processing board, a processing module, a processing device, etc.
  • the transceiver unit 901 is used to implement the functions of the transceiver unit 801 in the embodiment shown in Figure 8; the processing unit 902 is used to implement the functions of the processing unit 802 in the embodiment shown in Figure 8.
  • the transceiver unit 901 is used to perform the functions performed by the terminal in steps S503 and S505 of the embodiment shown in Figure 5; the processing unit 902 is used to perform steps S501, S502 and S502 of the embodiment shown in Figure 5. S504.
  • FIG 10 shows a simplified structural diagram of a network device.
  • Network equipment includes radio frequency signal transceiver and conversion parts and 1002 parts
  • the radio frequency signal transceiver and conversion part also includes a transceiver unit 1001 part.
  • the radio frequency signal transceiver and conversion part is mainly used for the transmission and reception of radio frequency signals and the conversion of radio frequency signals and baseband signals; the 1002 part is mainly used for baseband processing and control of network equipment.
  • the transceiver unit 1001 may also be called a receiver/transmitter (transmitter), a receiver/transmitter, a receive/transmit circuit, etc.
  • Part 1002 is usually the control center of the network device, which can generally be called a processing unit, and is used to control the network device to perform the steps performed by the network device in Figure 5 above.
  • the transceiver unit 1001 can be used to implement the functions of the transceiver unit 801 in the embodiment shown in Figure 8, and part 1002 is used to implement the functions of the processing unit 802 in the embodiment shown in Figure 8.
  • Part 1002 may include one or more single boards, and each single board may include one or more processors and one or more memories.
  • the processor is used to read and execute programs in the memory to implement baseband processing functions and perform network device processing. control. If there are multiple boards, each board can be interconnected to increase processing capabilities.
  • multiple single boards may share one or more processors, or multiple single boards may share one or more memories, or multiple single boards may share one or more processors at the same time. device.
  • the transceiver unit 1001 is configured to perform the functions performed by the network device in steps S503 and S505 of the embodiment shown in FIG. 5 .
  • the DMRS port indication device 1100 includes a processor 1101 and an interface circuit 1102 .
  • the processor 1101 and the interface circuit 1102 are coupled to each other.
  • the interface circuit 1102 may be a transceiver or an input-output interface.
  • the DMRS port indicating device 1100 may also include a memory 1103 for storing instructions executed by the processor 1101 or input data for the instructions executed by the processor 1101 or data generated after the processor 1101 executes the instructions.
  • the processor 1101 is used to implement the functions of the above-mentioned processing unit 802, and the interface circuit 1102 is used to implement the functions of the above-mentioned transceiver unit 801.
  • the chip When the above DMRS port indication device is a chip applied to a terminal, the chip is used to implement the functions of the terminal in the above method embodiment.
  • the chip receives information from other modules in the terminal (such as radio frequency modules or antennas), which is sent to the terminal by network equipment or other devices; or, the chip sends information to other modules in the terminal (such as radio frequency modules or antennas) , this information is sent by the terminal to the network device or other devices.
  • the chip When the above DMRS port indication device is a chip applied to network equipment, the chip is used to implement the functions of the network equipment in the above method embodiment.
  • the chip receives information from other modules in the network equipment (such as radio frequency modules or antennas), which is sent to the network equipment by the terminal or other equipment; or, the chip sends information to other modules in the network equipment (such as radio frequency modules or antennas) Send information, which is sent by network devices to terminals or other devices.
  • processor in the embodiment of the present application can be a central processing unit (CPU), or other general-purpose processor, digital signal processor (DSP), or application-specific integrated circuit (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • CPU central processing unit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor can be a microprocessor or any conventional processor.
  • DMRS port indication device provided by an embodiment of the present application, indication of DMRS antenna ports of more than 4 streams is realized.
  • the method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions.
  • Software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory In memory, register, hard disk, removable hard disk, compact disc read-only memory (CD-ROM) or any other form of storage medium well known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and storage media may be located in an ASIC. Additionally, the ASIC may be located in the first node.
  • the processor and the storage medium may also exist in the terminal as discrete components.
  • An embodiment of the present application also provides a communication system, including the above DMRS port indication device.
  • Embodiments of the present application also provide a computer-readable storage medium on which a computer program or instructions are stored. When the program or instructions are executed by a processor, the method described in the above embodiments is executed.
  • An embodiment of the present application also provides a computer program product, which when executed on a computing device causes the method described in the above embodiment to be executed.
  • the computer program product includes one or more computer programs or instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a terminal or other programmable device. Place The computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another.
  • the computer program or instructions may be transmitted from a website, computer, server or data center to another website site, computer, server or data center by wired or wireless means.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media.
  • the available media may be magnetic media, such as floppy disks, hard disks, and tapes; optical media, such as digital video optical disks; or semiconductor media, such as solid-state hard drives.
  • “at least one” refers to one or more, and “plurality” refers to two or more.
  • “And/or” describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the related objects before and after are an “or” relationship; in the formula of this application, the character “/” indicates that the related objects before and after are a kind of "division” Relationship.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本申请公开了一种DMRS端口指示方法、装置及存储介质。通过获取dmrs-Type和maxLength，确定第一关系，该第一关系与dmrs-Type和maxLength关联，该第一关系中包括天线端口字段的至少一个候选值、及与天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，每个候选值对应的候选天线端口的数量大于或等于N，N大于4，每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，并接收DCI，根据DCI中的天线端口字段所指示的一个值，确定对应的天线端口，接收该确定的天线端口对应的DMRS，实现了大于4流的DMRS天线端口的指示。

Description

DMRS端口指示方法、装置及存储介质
本申请要求于2022年08月12日提交中国国家知识产权局、申请号为202210972325.0、发明名称为“DMRS端口指示方法、装置及存储介质”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，尤其涉及一种解调参考信号(demodulation reference signal，DMRS)端口指示方法、装置及存储介质。
背景技术
DMRS用于估计数据信道或控制信道经历的等效信道矩阵，从而用于数据的检测和解调。
随着未来无线通信设备部署更加密集，终端的数目进一步增长，对多输入多输出(multi-input multi-output，MIMO)系统的传输流数(rank)提出了更高的需求,需要更多的DMRS端口来支撑更高的传输流数(大于12流)。目前3GPP NR协议中支持的正交DMRS端口总数目最大为12，难以满足未来通信系统发展需求。为了在不额外增加时频资源的情况下支持更多的DMRS端口，可以通过合理的DMRS序列设计，在码域或频域实现正交或低互相关的DMRS端口扩容。
然而，目前设计的上行传输中，每用户最大仅能支持4流(rank 4)的传输。如何支持最大rank 8的DMRS端口指示是需要解决的问题。此外，对于下行传输，目前rank 5～8DMRS端口指示不能用于对上述扩容后的DMRS端口进行指示，无法充分发挥扩容后DMRS端口在有限时频资源内更高密度的优势，因此存在较大的DMRS资源开销。
发明内容
本申请提供一种DMRS端口指示方法、装置及存储介质，以实现大于4流的DMRS天线端口的指示。
第一方面，提供了一种DMRS端口指示方法，其特征在于，所述方法包括：获取解调参考信号DMRS的类型dmrs-Type和前置DMRS允许的最大时域符号长度maxLength；确定第一关系，其中，所述第一关系与所述dmrs-Type和所述maxLength具有关联关系，所述第一关系中包括天线端口字段的至少一个候选值、及与所述天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，所述每个候选值对应的候选天线端口的数量大于或等于N，所述每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，其中，所述第一天线端口组和所述第二天线端口组包括的天线端口的数量相同，所述第一天线端口组和所述第二天线端口组分别对应至少两个码分复用组，且所述第一天线端口组和所述第二天线端口组对应的码分复用组的数量相同，所述N大于4；接收下行控制信息DCI，所述DCI包括所述天线端口字段，所述天线端口字段用于指示所述DCI中的天线端口字段的至少一个候选值中的一个值；根据所述指示的一个值，确定与所述指示的一个值对应的天线端口；以及接收所述确定的天线端口对应的DMRS。
在该方面中，实现了大于4流的DMRS天线端口的指示。
上述每个候选值对应的候选天线端口可以是候选天线端口的索引。
上述候选天线端口是相对于DCI中的天线端口字段所指示的一个值对应的天线端口而言的，候选天线端口是DMRS端口索引表中的天线端口，是可在该天线端口上发送DMRS，也可以不在该天线端口上发送DMRS。
所述第一天线端口组和所述第二天线端口组对应的码分复用组是相同的多个码分复用组。对应同一个CDM组的第一天线端口组和第二天线端口组对应的DMRS复用在相同的时频资源。
在一种可能的实现中，所述获取dmrs-Type和maxLength，包括：接收第一信令，所述第一信令包括所述dmrs-Type和所述maxLength。
在该实现中，可以通过第一信令携带dmrs-Type和maxLength。
第二方面，提供了一种DMRS端口指示方法，其特征在于，所述方法包括：获取解调参考信号DMRS的类型dmrs-Type和前置DMRS允许的最大时域符号长度maxLength；确定第一关系，其中，所述第一关系与所述dmrs-Type和所述maxLength具有关联关系，所述第一关系中包括天线端口字段的至少一个候选值、及与所述天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，所述每个候选值对应的候选天线端口的数量大于或等于N，所述每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，其中，所述第一天线端口组和所述第二天线端口组包括的天线端口的数量相同， 所述第一天线端口组和所述第二天线端口组分别对应至少两个码分复用组，且所述第一天线端口组和所述第二天线端口组对应的码分复用组的数量相同，所述N大于4；发送下行控制信息DCI，所述DCI包括所述天线端口字段，所述天线端口字段用于指示所述DCI中的天线端口字段的至少一个候选值中的一个值；根据所述指示的一个值，确定与所述指示的一个值对应的天线端口；以及发送所述确定的天线端口对应的DMRS。
在该方面中，实现了大于4流的DMRS天线端口的指示。
在一种可能的实现中，所述方法还包括：发送第一信令，所述第一信令包括所述dmrs-Type和所述maxLength。
在该实现中，可以通过第一信令携带dmrs-Type和maxLength。
第三方面，提供了一种DMRS端口指示装置。所述DMRS端口指示装置可以实现上述第一方面中的方法。例如所述DMRS端口指示装置可以是终端或者终端的芯片系统。可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现中，所述装置包括：收发单元和处理单元；其中：所述处理单元，用于获取解调参考信号DMRS的类型dmrs-Type和前置DMRS允许的最大时域符号长度maxLength；所述处理单元，还用于确定第一关系，其中，所述第一关系与所述dmrs-Type和所述maxLength具有关联关系，所述第一关系中包括天线端口字段的至少一个候选值、及与所述天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，所述每个候选值对应的候选天线端口的数量大于或等于N，所述每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，其中，所述第一天线端口组和所述第二天线端口组包括的天线端口的数量相同，所述第一天线端口组和所述第二天线端口组分别对应至少两个码分复用组，且所述第一天线端口组和所述第二天线端口组对应的码分复用组的数量相同，所述N大于4；所述收发单元，用于接收下行控制信息DCI，所述DCI包括所述天线端口字段，所述天线端口字段用于指示所述DCI中的天线端口字段的至少一个候选值中的一个值；所述处理单元，还用于根据所述指示的一个值，确定与所述指示的一个值对应的天线端口；以及所述收发单元，还用于接收所述确定的天线端口对应的DMRS。
可选地，所述收发单元，还用于接收第一信令，所述第一信令包括所述dmrs-Type和所述maxLength。
第四方面，提供了一种DMRS端口指示装置。所述DMRS端口指示装置可以实现上述第二方面中的方法。例如所述DMRS端口指示装置可以是网络设备或网络设备中的芯片系统。可以通过软件、硬件、或者通过硬件执行相应的软件实现上述方法。
在一种可能的实现中，所述装置包括：收发单元和处理单元；其中：所述处理单元，用于获取解调参考信号DMRS的类型dmrs-Type和前置DMRS允许的最大时域符号长度maxLength；所述处理单元，还用于确定第一关系，其中，所述第一关系与所述dmrs-Type和所述maxLength具有关联关系，所述第一关系中包括天线端口字段的至少一个候选值、及与所述天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，所述每个候选值对应的候选天线端口的数量大于或等于N，所述每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，其中，所述第一天线端口组和所述第二天线端口组包括的天线端口的数量相同，所述第一天线端口组和所述第二天线端口组分别对应至少两个码分复用组，且所述第一天线端口组和所述第二天线端口组对应的码分复用组的数量相同，所述N大于4；所述收发单元，还用于发送下行控制信息DCI，所述DCI包括所述天线端口字段，所述天线端口字段用于指示所述DCI中的天线端口字段的至少一个候选值中的一个值；所述处理单元，还用于根据所述指示的一个值，确定与所述指示的一个值对应的天线端口；以及所述收发单元，还用于发送所述确定的天线端口对应的DMRS。
可选地，所述收发单元，还用于发送第一信令，所述第一信令包括所述dmrs-Type和所述maxLength。
在另一种可能的实现方式中，上述DMRS端口指示装置包括与存储器耦合的处理器；所述处理器被配置为支持所述装置执行上述DMRS端口指示方法中相应的功能。存储器用于与处理器耦合，其保存所述装置必要的计算机程序(或计算机可执行指令)和/或数据。可选的，所述DMRS端口指示装置还可以包括通信接口用于支持所述装置与其他网元之间的通信，例如数据和/或信号的发送或接收。示例性的，通信接口可以是收发器、电路、总线、模块或其它类型的通信接口。可选的，该存储器可以位于该DMRS端口指示装置内部，和处理器集成在一起；也可以位于该DMRS端口指示装置外部。
在又一种可能的实现方式中，上述DMRS端口指示装置包括处理器和收发装置，所述处理器与所述收发装置耦合，所述处理器用于执行计算机程序或指令，以控制所述收发装置进行信息的接收和发送；当所 述处理器执行所述计算机程序或指令时，所述处理器还用于通过逻辑电路或执行代码指令实现上述方法。其中，所述收发装置可以为收发器、收发电路、接口电路或输入输出接口，用于接收来自所述DMRS端口指示装置之外的其它DMRS端口指示装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述DMRS端口指示装置之外的其它DMRS端口指示装置。当所述DMRS端口指示装置为芯片时，所述收发装置为收发电路或输入输出接口。
当上述DMRS端口指示装置为芯片时，发送单元可以是输出单元，比如输出电路或者通信接口；接收单元可以是输入单元，比如输入电路或者通信接口。当所述DMRS端口指示装置为终端时，发送单元可以是发射器或发射机；接收单元可以是接收器或接收机。
结合第一方面至第四方面，在又一种可能的实现中，所述每个候选值对应的候选天线端口的数量均为N。
结合第一方面至第四方面，在又一种可能的实现中，所述第一关系中还包括与所述DCI中的天线端口字段的至少一个候选值中的每个候选值对应的不映射数据的DMRS码分复用组的数量。
结合第一方面至第四方面，在又一种可能的实现中，所述至少一个候选值对应的候选天线端口对应的DMRS映射在一个符号上，且所述至少一个候选值对应的候选天线端口属于两个DMRS码分复用组；或所述至少一个候选值对应的候选天线端口对应的DMRS映射在两个符号上，且所述至少一个候选值对应的候选天线端口属于一个DMRS码分复用组。
结合第一方面至第四方面，在又一种可能的实现中，所述至少一个候选值对应的候选天线端口对应的DMRS映射在一个符号上，且所述至少一个候选值对应的候选天线端口属于两个不映射数据的DMRS码分复用组；或所述至少一个候选值对应的候选天线端口对应的DMRS映射在两个符号上，且所述至少一个候选值对应的候选天线端口属于一个不映射数据的DMRS码分复用组。
在该实现中，至少一个候选值对应的候选天线端口对应的DMRS映射在一个符号上，减少了符号开销；或至少一个候选值对应的候选天线端口属于一个不映射数据的DMRS码分复用组，剩余的码分复用组对应的时频资源可以用于映射数据，减少了资源需求，提高了资源利用率。
结合第一方面至第四方面，在又一种可能的实现中，所述DMRS映射在一个符号上，且所述至少一个候选值对应的候选天线端口属于两个DMRS码分复用组；或所述DMRS映射在两个符号上，且所述至少一个候选值对应的候选天线端口属于一个DMRS码分复用组。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为1，所述N为5；所述天线端口字段的取值为第一值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-4。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为1，所述N为6；所述天线端口字段的取值为第二值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,4,6。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为1，所述N为7；所述天线端口字段的取值为第三值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-6。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为1，所述N为8；所述天线端口字段的取值为第四值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-7。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为1，所述N为5；所述天线端口字段的取值为第一值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,8。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为1，所述N为6；所述天线端口字段的取值为第二值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,8,10。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为1，所述N为7；所述天线端口字段的取值为第三值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,8,9,10。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为1，所述N为8；所述天线端口字段的取值为第四值，所述不映射数据的DMRS码分复用组的数量为2，所述天线 端口为0,1,2,3,8,9,10,11。
结合第一方面至第四方面，在又一种可能的实现中，所述第一天线端口组和所述第二天线端口组分别包括4个天线端口，所述第一天线端口组和所述第二天线端口组分别对应2个CDM组。
结合第一方面至第四方面，在又一种可能的实现中，所述第一天线端口组和所述第二天线端口组包括共计8个天线端口，分别对应天线端口索引0,1,2,3,4,5,6,7，或者分别对应天线端口索引0,1,2,3,8,9,10,11。所述第一天线端口组和所述第二天线端口组分别对应的2个CDM组为CDM组0和CDM组1。结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为2，所述N为5；所述天线端口字段的取值为第五值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,4,5,8，所述DMRS映射在两个符号上；和/或所述天线端口字段的取值为第六值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-4，所述DMRS映射在一个符号上。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为2，所述N为6；所述天线端口字段的取值为第七值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,4,5,8,9，所述DMRS映射在两个符号上；和/或所述天线端口字段的取值为第八值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,4,6，所述DMRS映射在一个符号上。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为2，所述N为7；所述天线端口字段的取值为第九值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,4,5,8,9,12，所述DMRS映射在两个符号上；和/或所述天线端口字段的取值为第十值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-6，所述DMRS映射在一个符号上。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为2，所述N为8；所述天线端口字段的取值为第十一值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,4,5,8,9,12,13，所述DMRS映射在两个符号上；和/或所述天线端口字段的取值为第十二值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-7，所述DMRS映射在一个符号上。
结合第一方面至第四方面，在又一种可能的实现中，所述第一天线端口组和所述第二天线端口组分别包括8个天线端口，所述第一天线端口组和所述第二天线端口组分别对应2个CDM组。
结合第一方面至第四方面，在又一种可能的实现中，所述第一天线端口组和所述第二天线端口组包括共计16个天线端口，分别对应天线端口索引0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15。所述第一天线端口组和所述第二天线端口组分别对应的2个CDM组为CDM组0和CDM组1。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为1，所述N为5；所述天线端口字段的取值为第十三值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-4；和/或所述天线端口字段的取值为第十四值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为1，所述N为6；所述天线端口字段的取值为第十五值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-5；和/或所述天线端口字段的取值为第十六值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,8。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为1，所述N为7；所述天线端口字段的取值为第十七值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-6；和/或所述天线端口字段的取值为第十八值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为1，所述N为8；所述天线端口字段的取值为第十九值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0,1,2,3,4,5,6,8；和/或所述天线端口字段的取值为第二十值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8,9。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为1，所述N为5；所述天线端口字段的取值为第十三值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-4；和/或所述天线端口字段的取值为第十四值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,12。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为1，所述N为6；所述天线端口字段的取值为第十五值，所述不映射数据的DMRS码分复用组的数量为3，所述天 线端口为0-5；和/或所述天线端口字段的取值为第十六值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,12,14。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为1，所述N为7；所述天线端口字段的取值为第十七值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0,1,2,3,4,5,12；和/或所述天线端口字段的取值为第十八值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,12,13,14。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为1，所述N为8；所述天线端口字段的取值为第十九值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0,1,2,3,4,5,12,14；和/或所述天线端口字段的取值为第二十值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,12,13,14,15。
结合第一方面至第四方面，在又一种可能的实现中，所述第一天线端口组和所述第二天线端口组分别包括6个天线端口，所述第一天线端口组和所述第二天线端口组分别对应3个CDM组。
结合第一方面至第四方面，在又一种可能的实现中，所述第一天线端口组和所述第二天线端口组包括共计12个天线端口，分别对应天线端口索引0,1,2,3,4,5,6,7,8,9,10,11，或者分别对应天线端口索引0,1,2,3,4,5,12,13,14,15,16,17。所述第一天线端口组和所述第二天线端口组分别对应的3个CDM组为CDM组0、CDM组1和CDM组2。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为2，所述N为5；所述天线端口字段的取值为第二十一值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-4，所述DMRS映射在一个符号上；和/或所述天线端口字段的取值为第二十二值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6，所述DMRS映射在一个符号上；和/或所述天线端口字段的取值为第二十三值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,6,7,12，所述DMRS映射在两个符号上。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为2，所述N为6；所述天线端口字段的取值为第二十四值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-5，所述DMRS映射在一个符号上；和/或所述天线端口字段的取值为第二十五值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,8，所述DMRS映射在一个符号上；和/或所述天线端口字段的取值为第二十六值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,6,7,12,13，所述DMRS映射在两个符号上。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为2，所述N为7；所述天线端口字段的取值为第二十七值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8，所述DMRS映射在一个符号上；和/或所述天线端口字段的取值为第二十八值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,6,7,12,13,18，所述DMRS映射在两个符号上。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为2，所述maxLength为2，所述N为8；所述天线端口字段的取值为第二十九值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8，所述DMRS映射在一个符号上；和/或所述天线端口字段的取值为第三十值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,6,7,12,13,18,19，所述DMRS映射在两个符号上。
结合第一方面至第四方面，在又一种可能的实现中，所述第一天线端口组和所述第二天线端口组分别包括12个天线端口，所述第一天线端口组和所述第二天线端口组分别对应3个CDM组。
结合第一方面至第四方面，在又一种可能的实现中，所述第一天线端口组和所述第二天线端口组包括共计24个天线端口，分别对应天线端口索引0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23。所述第一天线端口组和所述第二天线端口组分别对应的3个CDM组为CDM组0、CDM组1和CDM组2。
结合第一方面至第四方面，在又一种可能的实现中，所述dmrs-Type为1，所述maxLength为2，所述N为5，所述天线端口字段的取值为第三十一值，所述码分复用组的数量为2，所述天线端口为0-4，所述DMRS映射在两个符号上；和/或所述dmrs-Type为1，所述maxLength为2，所述N为6，所述天线端口字段的取值为第三十二值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,4,6，所述DMRS映射在两个符号上；和/或所述dmrs-Type为1，所述maxLength为2，所述N为7，所述天线端口字段的取值为第三十三值，所述码分复用组的数量为2，所述天线端口为0-6，所述DMRS映射在两个符号上；和/或所 述dmrs-Type为1，所述maxLength为2，所述N为8，所述天线端口字段的取值为第三十四值，所述码分复用组的数量为2，所述天线端口为0-7，所述DMRS映射在两个符号上；和/或所述dmrs-Type为2，所述maxLength为2，所述N为5，所述天线端口字段的取值为第三十五值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,6，所述DMRS映射在两个符号上；和/或所述dmrs-Type为2，所述maxLength为2，所述N为6，所述天线端口字段的取值为第三十六值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,6,8，所述DMRS映射在两个符号上；和/或所述dmrs-Type为2，所述maxLength为2，所述N为7，所述天线端口字段的取值为第三十七值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8，所述DMRS映射在两个符号上；和/或所述dmrs-Type为2，所述maxLength为2，所述N为8，所述天线端口字段的取值为第三十八值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8,9，所述DMRS映射在两个符号上。
第五方面，提供了一种通信系统，所述通信系统包括如第三方面所述的DMRS端口指示装置和第四方面所述的DMRS端口指示装置。
第六方面，提供了一种计算机可读存储介质，其上存储有计算机程序或指令，该程序或指令被处理器执行时，如第一方面、第二方面中的任一方面或任一种实现所述的方法被执行。
第七方面，提供了一种计算机程序产品，当其在计算设备上执行时，使得如第一方面、第二方面中的任一方面或任一种实现所述的方法被执行。
第八方面，提供一种电路，该电路与存储器耦合，该电路被用于执行上述第一方面、第二方面中的任一方面或任一种实现所述的方法。该电路可包括芯片电路。
附图说明
图1为本申请涉及的一种通信系统的示意图；
图2为本申请实施例提供的DMRS时频资源映射示意图；
图3为本申请实施例提供的一种DMRS端口扩容示意图；
图4为本申请实施例提供的另一种DMRS端口扩容示意图；
图5为本申请实施例提供的一种DMRS端口指示方法的流程示意图；
图6a为本申请实施例提供的单符号、类型1DMRS的时频资源映射示意图；
图6b为本申请实施例提供的双符号、类型1DMRS的时频资源映射示意图；
图7a为本申请实施例提供的单符号、类型2DMRS的时频资源映射示意图；
图7b为本申请实施例提供的双符号、类型2DMRS的时频资源映射示意图；
图8为本申请实施例提供的一种DMRS端口指示装置的结构示意图；
图9为本申请实施例提供的一种简化的终端的结构示意图；
图10为本申请实施例提供的一种简化的网络设备的结构示意图；
图11为本申请实施例提供的另一种DMRS端口指示装置的结构示意图。
具体实施方式
下面结合本申请实施例中的附图对本申请实施例进行描述。
本申请提供的技术方案可以应用于各种通信系统，例如：长期演进(long term evolution，LTE)系统、第五代(5th generation，5G)通信系统(或称为新无线(new radio，NR)系统)以及未来的其他通信系统如第六代(6th generation，6G)通信系统等。可选的，本申请所提供的技术方案还可以应用于物联网(internet of things，IoT)系统、窄带物联网(narrow band internet of things，NB-IoT)系统等。
图1给出了本申请涉及的一种通信系统的示意图。该通信系统包括至少一个网络设备和至少一个终端。在图1中，一个网络设备和多个终端(图中示例了用户设备(user equipment，UE)1～UE5)组成一个通信系统。在该通信系统中，UE1～UE5都可以和网络设备进行通信，其链路环境包括了上行、下行以及边路(side-link)传输，链路中传输的信息包括了实际传输的数据信息，以及用于指示或调度实际数据的控制信息。同时，UE3，UE4和UE5也可以组成一个通信系统，其链路传输环境和前述一致，具体的信息交互依托于网络的配置方式。
上述网络设备可以是能和终端通信的设备。网络设备可以是任意一种具有无线收发功能的设备。包括但不限于：基站例如节点B(NodeB)、演进型基站，例如演进节点B(eNodeB)、第五代(the fifth generation，5G)通信系统中的基站、未来通信系统中的基站或网络设备、WiFi系统中的接入节点、无线中继节点、无线回传节点等。网络设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制 器。网络设备还可以是小站，传输节点(transmission reference point，TRP)等。本申请的实施例对网络设备所采用的具体技术和具体设备形态不做限定。
该网络设备还可以是无线局域网(wireless fidelity，WiFi)系统中的接入节点、无线中继节点、无线回传节点等。该网络设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器。
为便于描述，下文将以基站为例来说明本申请所涉及的网络设备等。在基站的一些部署中，基站可以包括集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)等。在基站的另一些部署中，CU还可以划分为CU-控制面(control plane，CP)和CU-用户面(user plane，UP)等。在基站的另一些部署中，基站还可以是开放的无线接入网(openradioaccessnetwork，ORAN)架构等，本申请对于基站的具体部署方式不作限定。
上述终端是一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持、穿戴或车载；也可以部署在水面上，如轮船上等；还可以部署在空中，如飞机、气球和卫星上等。所述终端设备可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self-driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。本申请的实施例对应用场景不做限定。终端设备有时也可以称为用户设备、接入终端设备、UE单元、移动站、移动台、远方站、远程终端设备、移动设备、终端(terminal)、无线通信设备、UE代理或UE装置等。
可选的，图1所示的通信系统中，终端与终端之间还可以通过设备到设备(device to device，D2D)、车与任何事物(vehicle-to-everything，V2X)或机器到机器(machine to machine，M2M)等技术进行通信，本申请对于终端与终端之间的DMRS端口指示方法不作限定。
示例性地，本申请实施例中的术语“系统”和“网络”可被互换使用。
下面介绍一下本申请的实施例可能涉及的概念：
DMRS：
DMRS用于估计数据信道(如物理上行共享信道(physical uplink shared channel，PUSCH)或物理下行共享信道(physical downlink shared channel，PDSCH))或控制信道(如物理上行控制信道(physical uplink control channel，PUCCH)或物理下行控制信道(physical downlink control channel，PDCCH))经历的等效信道矩阵，从而用于数据的检测和解调。以PUSCH为例，DMRS通常与发送的数据信号进行相同的预编码，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，发送的数据符号向量为x，DMRS与数据进行相同的预编码操作(乘以相同的预编码矩阵P)，接收端相应的接收信号向量可以表示为：
数据：
DMRS：
可以看到，对于数据信号和参考信号，经历的等效信道均为接收端基于已知的DMRS向量s，利用信道估计算法(如最小二乘法(least squares，LS)信道估计，最小均方误差(minimum mean square error，MMSE)信道估计等)可以获得对等效信道的估计。基于等效信道可以完成数据信号的MIMO均衡和后续解调。
由于DMRS用于估计等效信道其维度为NR×R，其中NR为接收天线数目，R为传输流数(也称为传输层数，空间层数或秩(rank))。通常来说，一个DMRS端口与一个空间层相对应。一个DMRS端口对应一组DMRS符号，或者对应一组DMRS序列。所述DMRS符号包含多个DMRS符号元素，对应映射在相应的时频资源上进行传输。对于传输流数为R的MIMO传输，对应的DMRS端口数目为R。为了保证信道估计的质量，通常不同DMRS端口为正交端口。不同DMRS端口对应的DMRS符号在频域、时频或码域的至少一个域上正交。
在本申请的一些场景中，“传输层数”和“rank”表示相同的含义，可以相互替换使用。
在本申请的一些场景中，天线端口和DMRS端口表示相同的含义，可以相互替换使用。
NR协议中的DMRS时频资源映射方式：
由于DMRS会额外占用时频资源，因此需要尽可能降低DMRS的开销。多个DMRS端口对应的DMRS资源为了减少相互的干扰，往往通过频分复用(frequency division multiplexing，FDM)，时分复用(time division multiplexing，TDM)或者码分复用(code division multiplexing，CDM)的方式映射在预设的时频 资源。目前5G NR支持2种DMRS资源映射类型。对于类型1(Type 1)DMRS，最大可支持8个正交端口；对于类型2(Type 2)DMRS，最大可支持12个正交端口。对于一个DMRS端口，为了对不同的时频资源进行信道估计，保证信道估计质量，需要在多个时频资源内发送多个DMRS符号。DMRS在时域上可以占用至少1个正交频分复用(orthogonal frequency division multiplexing，OFDM)符号，在频域上占用的带宽与调度的数据信号的调度带宽相同。一个端口对应的多个DMRS符号对应一个参考信号序列，一个参考信号序列包括多个参考信号序列元素。DMRS参考信号序列可以为gold序列。以DMRS参考信号序列为gold序列为例，参考信号序列中第n个元素r(n)可以通过下式生成：
其中，伪随机序列c(n)可以是序列长度为31的gold序列，对于输出长度为MPN的序列c(n)，n＝0,1,...,MPN-1，可以定义为：
c(n)＝(x1(n+NC)+x2(n+NC))mod 2
x1(n+31)＝(x1(n+3)+x1(n))mod 2
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod 2
其中，NC＝1600。第一个m序列x1(n)可以初始化为x1(0)＝1,x1(n)＝0,n＝1,2,...,30。第二个m序列x2(n)由参数cinit初始化。cinit可以定义为 这里l表示一个时隙内包含的OFDM符号索引，表示一个系统帧内的时隙索引， 可以由高层信令进行配置。与小区标识(identification，ID)有关，通常可以等于小区ID， 为初始化参数，取值可以为0或1。λ表示DMRS端口对应的码分复用组索引。
一个端口对应的DMRS参考信号序列通过预设的时频资源映射规则，与对应的掩码序列相乘后映射到对应的时频资源上。在目前NR协议中，定义了2类DMRS配置方式，包括Type 1 DMRS和Type 2 DMRS。
对于端口p，对应的参考信号序列中第m个参考序列元素r(m)，按照如下规则映射至索引为(k,l)p,μ的资源粒子(resource element，RE)上。其中，索引为(k,l)p,μ的RE在时域上对应一个时隙内的索引为l的OFDM符号，在频域上对应索引为k的子载波，映射规则满足：


k′＝0,1；

n＝0,1,…；
l′＝0,1。
其中，μ为子载波间隔参数，为映射至索引为(k,l)p,μ的RE上端口p对应的DMRS信号符号，为DMRS信号符号占用的起始OFDM符号的符号索引或参考OFDM符号的符号索引。为功率缩放因子，wt(l′)为索引为l’的OFDM符号对应的时域掩码元素,wf(k′)为索引为k’的子载波对应的频域掩码元素，m＝2n+k′，Δ为子载波偏移因子。
对于配置类型1(Type 1 DMRS)映射规则中，DMRS端口p对应的wf(k′)、wt(l′),以及Δ的取值，可 以根据表1确定：
表1类型1 DMRS参数取值
其中，类型1 DMRS最大可支持8个正交端口(1000～1007)，p表示DMRS端口号，λ表示DMRS端口对应的码分复用组索引，Δ为子载波偏移因子，wt(l′)为索引为l’的OFDM符号对应的时域掩码元素,wf(k′)为索引为k’的子载波对应的频域掩码元素。
对于配置类型2(Type 2 DMRS)映射规则中，DMRS端口p对应的wf(k′)、wt(l′),以及Δ的取值，可以根据表2确定：
表2类型2 DMRS参数取值
其中，类型2 DMRS最大可支持12个正交端口(1000～1011)，λ为端口p所属的码分复用组的索引，同一码分复用组内的DMRS端口占用的时频资源相同。按照式(1)，Type 1单符号DMRS和双符号DMRS的时频资源映射方式如图2左边起第1幅图和第2幅图所示。
如图2左边起第1幅图所示，对于单符号DMRS(对应l′＝0)，最大支持4端口，DMRS资源占据一个OFDM符号。4个DMRS端口分为2个码分复用组(CDM group)，其中CDM group 0包含port 0和port 1；CDM group 1包含port 2和port 3。CDM group 0和CDM group 1是频分复用(映射在不同的频域资源上)。CMD group内包含的DMRS端口映射在相同的时频资源上。CMD group内包含的DMRS端口对应的参考信号通过正交掩码(orthogonal cover code，OCC)进行区分，从而保证CDM group内DMRS port的正交性，从而抑制了不同天线端口上传输DMRS之间的干扰。具体地，port 0和port 1位于相同的RE内，在频域以梳齿的方式进行资源映射，即port 0和port 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，占用的相邻的2个RE对应一个长度为2的OCC码字序列。例如，对于子载波0和子载波2，port 0和port 1采用一组长度为2的OCC码字序列(+1+1和+1-1)。类似地，port 2和port 3位于相同的RE内，在频域以梳齿的方式映射在port 0和port 1未占用的RE上。对于子载波1和子载波3，port 2和port 3采用一组长度为2的OCC码字序列(+1+1和+1-1)。
如图2左边起第2幅图所示，对于双符号DMRS，最大支持8端口。8个DMRS端口分为2个码分复用组，其中CDM group 0包含port 0、port 1、port 4和port 5；CDM group 1包含port 2、port 3、port 6和port 7。CDM group 0和CDM group 1是频分复用，CMD group内包含的DMRS端口对应的参考信号通过OCC进行区分。具体的，port 0、port 1、port 4和port 5位于相同的RE内，在频域以梳齿的方式进行资源映射，即port 0、port 1、port 4和port 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，占用的相邻的2个子载波和2个OFDM符号对应一个长度为4的OCC码字序列。例如，对于OFDM符号1和OFDM符号2对应的子载波0和子载波2，port 0、port 1、port 4和port 5采用一组长度为4的OCC编码(+1+1+1+1/+1+1-1-1/+1-1+1-1/+1-1-1+1)。类似地，port 2、port 3、port 6和port 7位于相同的RE内，在频域以梳齿的方式映射在port 0、port 1、port 4和port 5未占用的子载波上。对于OFDM符号1和OFDM符号2对应的子载波1和子载波3，port 2、port 3、port 6和port 7采用一组长度为4的OCC编码(+1+1+1+1/+1+1-1-1/+1-1+1-1/+1-1-1+1)。
对于配置类型(configuration type)2，单符号DMRS和双符号DMRS的时频资源映射方式如图2左边起第3幅图和第4幅图所示。如图2左边起第3幅图所示，对于单符号Type 2 DMRS，最大支持6端口。6个DMRS端口分为3个码分复用组，CDM group间采用频分复用，CDM内包含的DMRS端口所对应的参考信号通过OCC保证正交性。其中CDM group 0包含port 0和port 1；CDM group 1包含port 2和port 3；CDM group 2包含port 4和port 5。CDM group间是频分复用(映射在不同的频域资源上)。CMD group内包含的DMRS端口所对应的参考信号映射在相同的时频资源上。CMD group内包含的DMRS端口对应的参考信号通过OCC进行区分。对于一个DMRS端口，其对应的DMRS参考信号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。具体地，port 0和port 1位于相同的RE内，以梳齿的方式进行资源映射。以频域资源粒度为1RB为例，port 0和port 1占用子载波0、子载波1、子载波6和子载波7。port 2和port 3占用子载波2、子载波3、子载波8和子载波9。port 4和port 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，在相邻的2个子载波内对应长度为2的OCC码字序列(+1+1和+1-1)。
如图2左边起第4幅图所示，对于双符号Type 2 DMRS，最大支持12端口。12个DMRS端口分为3个CDM group，CDM group间采用频分复用，CDM内包含的DMRS端口对应的参考信号通过OCC保证正交性。其中CDM group 0包含port 0、port 1、port 6和port 7；CDM group 1包含port 2、port 3、port 8和port 9；CDM group 2包含port 4、port 5、port 10和port 11。CDM group间是频分复用(映射在不同的频域资源上)。CMD group内包含的DMRS端口所对应的参考信号映射在相同的时频资源上。CMD group内包含的DMRS端口对应的参考信号通过OCC进行区分。对于一个DMRS端口，其对应的DMRS参考信号在频域映射在多个包含连续2个子载波的资源子块内，相邻的所述资源子块之间在频域间隔4个子载波。具体的，一个CDM group包含的端口位于相同的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，port 0、port 1、port 6和port 7占用OFDM符号1和OFDM符号2对应的子载波0、子载波1、子载波6和子载波7。port 2、port 3、port 8和port 9占用OFDM符号1和OFDM符号2对应的子载波2、子载波3、子载波8和子载波9。port 4、port 5、port 10和port 11占用OFDM符号1和OFDM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，在2个OFDM符号对应的相邻的2个子载波内对应长度为4的OCC码字序列(+1+1+1+1/+1+1-1-1/+1-1+1-1/+1-1-1+1)。
随着未来无线通信设备部署更加密集，终端数目进一步增长，对MIMO传输流数提出了更高的需求。此外，后续大规模输入输出(massive MIMO)系统的不断演进，收发天线数目进一步增加(网络设备发送天线数目支持128发送天线(transmission antenna，T)或256T，终端接收天线数目8接收天线(receiving antenna，R))，信道信息获取更加精准，可以进一步支持更高的传输流数以提升MIMO系统的频谱效率。以上方面势必需要更多的DMRS端口来支撑更高的传输流数(大于12流)。随着传输流数的提升，对于信道估计的准确性要求更高。而目前最大12个正交端口难以保证大于12流的传输的较好性能。扩充现有正交DMRS端口数目的最简单的方法就是增加DMRS占用的时频资源。这种方法可以保证每个DMRS端口所对应的DMRS符号数目不变，然而DMRS开销的成倍增加也会成倍降低系统的频谱效率。另一种方法是在保证相同时频资源(开销)的情况下，复用更多的正交DMRS端口对应的DMRS资源。为了不增加额外时频资源开销，在现有NR DMRS端口基础上，进一步通过码分复用增强引入新的DMRS端口，是其中一种有效的技术方案。
为了在不额外增加时频资源的情况下支持更多的DMRS端口，可以通过合理的DMRS序列设计，在 码域实现正交或低互相关的DMRS端口扩容。
以Type 1双符号DMRS为例，一种DMRS端口扩容方法如图3所示。其中，现有DMRS端口组包含现有NR协议中定义的8个Type 1 DMRS端口，扩容端口组包含新增的8个DMRS端口，因此共计可以支持最大16个DMRS端口。如前所述，对于现有DMRS端口组，一个CDM组对应4个DMRS端口。一个CDM组内的4个DMRS端口通过4长的OCC码(w1,w2,w3,w4)进行码分复用，映射在2个子载波和2个OFDM符号上，其中w1,w2,w3,w4的取值如表1所示。
对于新增的DMRS端口组，同样对应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，与现有NR协议中定义的属于同一个CDM组的DMRS端口占用相同的时频资源。图3以CDM组0为例，对应新增DMRS端口8,9,12,13，在一个RB内占用索引为0/2/4/6/8/10的子载波。新增DMRS端口对应两层掩码，其时频资源映射方式可以表示为：


k′＝0,1；

n＝0,1,…。
其中，和r(2n+k′)的定义与式(1)相同。c(k′,l′)表示内层掩码，可以是长度为4的OCC码(如walsh code)，用于保证在一个CDM组中复用的4个新增DMRS端口的正交性。b(n)表示外层掩码，用于保证复用在相同时频资源的现有端口和新增端口的正交。在一种实现方式下，b(n)＝{+1,-1,+1,-1,……}。
对于Type 2双符号DMRS，可以采用类似的DMRS端口扩容设计，DMRS端口扩容方法如图4所示。Type 2 DMRS扩容端口时频资源映射方式同样如式(2)所示。
在一种实现方式下，Type 1/Type 2 DMRS扩容后，在现有DMRS端口基础上新增的DMRS端口的时频资源映射方式可以进一步表示为：


k′＝0,1；

n＝0,1,…；
其中b(0)＝1，b(1)＝-1。对于Type 1 DMRS，cf(k′)ct(l′)的定义如下表3所示：
表3
或者如下表4所示：
表4

对于Type 2 DMRS，cf(k′)ct(l′)的定义如下表5所示：
表5
或者如下表6所示：
表6
对于Type 1单符号DMRS和Type 2双符号DMRS，也可以采用类似的DMRS端口扩容设计。对于现有NR协议中定义的单符号Type 1 DMRS，支持最大正交DMRS端口数目为4，通过上述DMRS扩容设计，支持的最大正交DMRS端口数目可以提升到8。对于现有NR协议中定义的单符号Type 2 DMRS，支持最大正交DMRS端口数目为6，通过上述DMRS扩容设计，支持的最大正交DMRS端口数目可以提升到12。
对于上行传输，终端的发送行为受到网络设备的调度。网络设备需要通过指示信息，通知终端发送上行数据对应的数据流数目(也称为rank)，以及对应的DMRS端口索引。从而终端可以在发送上行的数据的时刻，在对应的时频资源上，按照指示的DMRS和传输流数，对上行数据和DMRS进行发送。以NR协议为例，目前上行链路(uplink，UL)最大支持4流传输，网络设备通过下行控制信息(downlink control information，DCI)向终端指示传输流数目(rank)以及对应的DMRS端口索引。具体地，DCI信令中包含天线端口(antenna port)字段，用于指示对应的DMRS端口索引。对于不同的rank值，对应不同的DMRS 端口索引表格。
以单符号Type 1 DMRS为例，当传输预编码(transform precoder)未激活时，rank1～rank 4对应的DMRS端口索引表如表7～10所示。
表7 dmrs-Type＝1，最大DMRS符号数为(maxLength)1，rank＝1对应的DMRS端口索引(1000+DMRS port)
如表7所示，天线端口字段的取值(value)为0时，不映射数据的DMRS CDM组的数量为1(number of DMRS CDM group(s)without data)，对应的DMRS端口(DMRS port(s))索引为0，前置符号的数量(nmber of front-load symbols)为1个符号；天线端口字段的取值为1，不映射数据的DMRS CDM组的数量为1，对应的DMRS端口索引为1，前置符号的数量为1个符号，等等。
表8 dmrs-Type＝1，maxLenght＝2，rank＝2对应的DMRS端口索引(1000+DMRS port)
如表8所示，天线端口字段的取值为0，不映射数据的DMRS CDM组的数量为1，对应的DMRS端口索引为0和1，前置符号的数量为1个符号；天线端口字段的取值为1，不映射数据的DMRS CDM组的数量为2，对应的DMRS端口索引为0和1，前置符号的数量为1个符号，等等。
表9 dmrs-Type＝1，maxLength＝2，rank＝3对应的DMRS端口索引(1000+DMRS port)
如表9所示，天线端口字段的取值为0，不映射数据的DMRS CDM组的数量为2，对应的DMRS端口索引为0、1、2，前置符号的数量为1个符号。
表10 dmrs-Type＝1，maxLength＝2，rank＝4对应的DMRS端口索引(1000+DMRS port)
如表10所示，天线端口字段的取值为0，不映射数据的DMRS CDM组的数量为2，对应的DMRS端口索引为0、1、2，前置符号的数量为1个符号。
以双符号Type 1 DMRS为例，当传输预编码未激活时，rank1～rank 4对应的DMRS端口索引表如表11～14所示。终端可以基于指示的rank值，选择对应的DMRS端口索引表，从而确定指示的端口索引。
表11 dmrs-Type＝1，maxLength＝2，rank＝1对应的DMRS端口索引(1000+DMRS port)
如表11所示，天线端口字段的取值为0时，不映射数据的DMRS CDM组的数量为1，对应的DMRS端口的索引为0，前置符号的数量为1个符号；天线端口字段的取值为1，不映射数据的DMRS CDM组的数量为1，对应的DMRS端口索引为1，前置符号的数量为1个符号，等等。
表12 dmrs-Type＝1，maxLenght＝2，rank＝2对应的DMRS端口索引(1000+DMRS port)
如表12所示，天线端口字段的取值为0，不映射数据的DMRS CDM组的数量为1，对应的DMRS端口索引为0和1，前置符号的数量为1个符号；天线端口字段的取值为1，不映射数据的DMRS CDM组的数量为2，对应的DMRS端口索引为0和1，前置符号的数量为1个符号，等等。
表13 dmrs-Type＝1，maxLength＝2，rank＝3对应的DMRS端口索引(1000+DMRS port)
如表13所示，天线端口字段的取值为0，不映射数据的DMRS CDM组的数量为2，对应的DMRS端口索引为0、1、2，前置符号的数量为1个符号；天线端口字段的取值为1，不映射数据的DMRS CDM组的数量为2，对应的DMRS端口索引为0、1和4，前置符号的数量为2个符号，等等。
表14 dmrs-Type＝1，maxLength＝2，rank＝4对应的DMRS端口索引(1000+DMRS port)
如表14所示，天线端口字段的取值为0，不映射数据的DMRS CDM组的数量为2，对应的DMRS端口索引为0、1、2、3，前置符号的数量为1个符号；天线端口字段的取值为1，不映射数据的DMRS CDM组的数量为2，对应的DMRS端口索引为0、1、4和5，前置符号的数量为2个符号，等等。
对于下行传输，网络设备同样可以给终端指示发送的数据流数目rank，以及对应的DMRS端口索引。具体地，DCI信令中包含天线端口字段，用于指示分配的DMRS端口索引。对于不同的dmrs-Type和maxLength配置的取值，NR协议定义了不同的DMRS端口表。如表15-表18分别给出了dmrs-Type＝1,maxLength＝1；dmrs-Type＝1,maxLength＝2；dmrs-Type＝2,maxLength＝1以及dmrs-Type＝2,maxLength＝2对应的DMRS端口索引表。DCI信令中天线端口字段指示高层信令配置的dmrs-Type和maxLength取值所对应的DMRS端口表中的索引值，每个索引值与一个或多个DMRS端口索引对应。
NR系统最多可以同时处理2个码字(codeword)：码字0和码字1。单码字流最多可以映射到4层(即4个DMRS端口)，双码字流最多可以映射到8层。在该场景中，仅需单码字流。示例性地，码字0使能(enabled)，码字1不使能(disabled)。
表15 dmrs-Type＝1，maxLength＝1对应的DMRS端口索引(1000+DMRS port)
在表15中，天线端口字段包括4比特，对应16个天线端口字段的取值。其中，天线端口字段的取值为12-15作为保留位。
dmrs-Type＝1，单个时域符号最大可支持4个DMRS端口：port 0～port3。
天线端口字段的取值为“0”，用于指示port 0；天线端口字段的取值为“1”，用于指示天线端口port 1，等等。
上述4个DMRS端口可以被划分为2个CDM组：CDM组0和CDM组1。
对于Type 1 DMRS，如表7～15中，不映射数据的DMRS码分复用组的数量决定了DMRS和数据信号是否可以复用在相同的OFDM符号上。不映射数据的DMRS码分复用组的数量为1时，表示1个CDM组对应的时频资源不会映射数据信号，而剩余的1个CDM组对应的时频资源可以用于映射数据信号。通常情况下，不映射数据信号的时频资源为CDM组0对应的时频资源，可以映射数据的时频资源为CDM组1对应的时频资源；不映射数据的DMRS码分复用组的数量为2时，表示2个CDM组对应的时频资源不会映射数据信号，此时在DMRS映射的OFDM符号内，不会映射数据符号。以上不会映射数据信号的时频资源上，可以用于发送DMRS，或者空闲不发送信号。
maxLength＝1，表示不同前置DMRS允许的最大时域符号长度为1，即允许DMRS映射到最多1个时域符号上。
表16 dmrs-Type＝1，maxLength＝2对应的DMRS端口索引(1000+DMRS port)
表16中有关天线端口字段的取值、不映射数据的DMRS码分复用组的数量、天线端口和maxLength的含义可参考表1的描述。
与表15不同的是，表16中，天线端口字段为5比特，可以有32种取值。当天线端口少于4个端口时，仅需单码字流，示例性地，码字0使能，码字1不使能；当天线端口多于4个端口时，需双码字流，示例性地，码字0和码字1均使能。
maxLength＝2，表示不同前置DMRS允许的最大时域符号长度为2，即允许DMRS映射到最多2个时域符号上。
具体地，对于单码字流，天线端口字段的取值为“0”至“11”时，前置符号的数量(Number of front-load symbols)为1，即允许DMRS映射到1个时域符号上；天线端口字段的取值为“12”至“30”时，前置符号的数量为2，即允许DMRS映射到2个时域符号上。
对于双码字流，天线端口字段的取值为“0”至“3”时，前置符号的数量为2，即允许DMRS映射到2个时域符号上。
表17 dmrs-Type＝2，maxLength＝1对应的DMRS端口索引表(1000+DMRS port)
表17中有关天线端口字段的取值、不映射数据的DMRS码分复用组的数量、天线端口和maxLength的含义可参考表15和表16的描述。
与表15、表16不同的是，表17中，dmrs-Type＝2，1个时域符号可以支持6个端口。
表18 dmrs-Type＝2，maxLength＝2对应的DMRS端口索引表(1000+DMRS port)


表18中有关天线端口字段的取值、不映射数据的DMRS码分复用组的数量、天线端口和maxLength的含义可参考表15和表16的描述。
对于Type 2 DMRS，如表15～18中，不映射数据的DMRS码分复用组的数量决定了DMRS和数据信号是否可以复用在相同的OFDM符号上。不映射数据的DMRS码分复用组的数量为1时，表示1个CDM组对应的时频资源不会映射数据信号，而剩余的2个CDM组对应的时频资源可以用于映射数据信号。通常情况下，不映射数据信号的时频资源为CDM组0对应的时频资源，可以映射数据的时频资源为CDM组1对应的时频资源以及CDM组2对应的时频资源；不映射数据的DMRS码分复用组的数量为2时，表示2个CDM组对应的时频资源不会映射数据信号，剩余的1个CDM组对应的时频资源可以用于映射数据信号。通常情况下，不映射数据信号的时频资源为CDM组0和CDM组1对应的时频资源，可以映射数据的时频资源为CDM组2对应的时频资源；不映射数据的DMRS码分复用组的数量为3时，表示3个CDM组对应的时频资源不会映射数据信号，此时在DMRS映射的OFDM符号内，不会映射数据符号。以上不会映射数据信号的时频资源上，可以用于发送DMRS，或者空闲不发送信号。
与表17不同的是，表18中，dmrs-Type＝2，1个时域符号可以支持最大6个正交DMRS端口。
与表15-表17不同的是，表18中，天线端口字段为6比特，可以有64种取值。
对于双码字流，天线端口字段的取值为“0”至“5”时，前置符号的数量为2，即允许DMRS映射到2个时域符号上。
对于如上所述的上行系统的DMRS端口指示，可以看出，目前上行最大可支持4流的传输(最大rank＝4)。随着未来终端天线技术的不断演进，未来终端天线数目会进一步增加，如8个接收天线。为了更有效地提升传输速率，更大天线数目使能更高的传输流数。未来需要进一步支持4流以上的MIMO传输(对于单个终端来说，比如支持rank 5～8)。而如上所述的上行DMRS端口索引表格无法支持大于4流的传输。
对于如上所述的下行系统的DMRS端口指示，可以看出，目前下行最大可支持8流的传输，但是支持rank 5～8需要较大的DMRS开销。例如，对于Type 1单符号DMRS，最大仅有4个DMRS端口，无法支持rank 5～8。因此Type 1DMRS需要支持大于4流传输，必须使用双符号DMRS。此外，对于Type 2单符号DMRS，只能最大支持rank 6的传输，为了支持rank 7和rank 8，必须使用双符号DMRS。双符号DMRS相比单符号DMRS会额外增加一个OFDM符号的开销。
如前所述，DMRS通过扩容可以实现2倍正交DMRS端口数目的支持，这为rank 5～8的可选DMRS端口索引设计提供了新的设计能力。然而，目前没有关于对rank 5～8的DMRS端口如何进行指示的方案。
有鉴于此，本申请提供一种DMRS端口指示方案，通过获取dmrs-Type和maxLength，确定第一关系，该第一关系与dmrs-Type和maxLength关联，该第一关系中包括天线端口字段的至少一个候选值、及与天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，每个候选值对应的候选天线端口的数量大于或等于N，N大于4，每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，并接收DCI，根据DCI中的天线端口字段所指示的一个值，确定对应的天线端口，接收该确定的天线端口对应的DMRS，实现了大于4流的DMRS天线端口的指示。
如图5所示，为本申请实施例提供的一种DMRS端口指示方法的流程示意图，示例性地，该方法可以包括以下步骤：
S501.终端获取解调参考信号DMRS的类型(dmrs-Type)和最大DMRS符号数(maxLength)。
示例性地，网络设备可以发送第一信令，该第一信令包括上述dmrs-Type和maxLength。具体地，网络设备可以在高层信令(higher layer parameter)，例如无线资源控制(radio resource control，RRC)或者无线资源控制重配置(RRCReconfiguration)消息中包括上述dmrs-Type和maxLength。其中dmrs-Type可以是Type 1或者Type 2。此外，dmrs-Type的可选取值还可以包括Type 1E和Type 2E，其中Type 1E表示R18扩容DMRS类型1，Type 2E表示R18扩容DMRS类型2。
终端也可以通过其它方式获取上述dmrs-Type和maxLength，例如，可以是预先存储在终端中，或者终端和网络设备预先协商得到的，或者通过其它的信令获得的。
示例性地，解调参考信号DMRS的类型(dmrs-Type)和最大DMRS符号数(maxLength)也可以是其它的名称，本申请实施例对此不作限制。
S502.终端确定第一关系。
其中，第一关系中包括天线端口字段的至少一个候选值、及天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口。本实施例中，每个候选值对应的候选天线端口的数量大于或等于N，N大于4。例如，N可以为5～8。需要说明的是，每个候选值对应的候选天线端口是针对单个终端(single user，SU)来说的。上述候选天线端口是相对于DCI中的天线端口字段所指示的一个值对应的天线端口而言的，候选天线端口是DMRS端口索引表中的天线端口，是可在该天线端口上发送DMRS，也可以不在该天线端口上发送DMRS。
示例性地，每个候选值对应的候选天线端口的数量均为N。N个天线端口与N个空间层对应。
第一关系与dmrs-Type和maxLength具有关联关系。根据dmrs-Type、maxLength的不同，天线端口字段的至少一个候选值、及与天线端口字段的至少一个候选值中的每个候选值对应的N个候选天线端口可以不同。
本实施例中，上述每个候选值对应的候选天线端口包括在第一天线端口组和第二天线端口组中。其中，第一天线端口组和第二天线端口组包括的天线端口的数量相同，第一天线端口组和第二天线端口组分别对应至少两个码分复用组，且第一天线端口组和第二天线端口组对应的码分复用组的数量相同。在一种实现方式下，第一天线端口组和第二天线端口组对应相同的多个码分复用组。对应同一个码分复用组的第一天线端口组和第二天线端口组包含的天线端口对应的DMRS映射在相同的时频资源上。
这里的第一天线端口组可以称为扩容后的天线端口组，如图3或图4所示；第二天线端口组可以称为未扩容的天线端口组或现有天线端口组，如图2所示。扩容后的天线端口组包括的天线端口的数量与未扩容的天线端口组包括的天线端口的数量相同。扩容后的天线端口组和未扩容的天线端口组分别对应至少两个码分复用组，且扩容后的天线端口组和未扩容的天线端口组对应的码分复用组的数量相同。
如图6a所示，为本申请实施例提供的单符号、类型1DMRS的时频资源映射示意图，其中，通过DMRS端口扩容设计，可以支持的最大DMRS端口数目为8，分为2个天线端口组，每个天线端口组均包含4个DMRS端口。其中第一天线端口组包括DMRS端口4、5、6、7，第二天线端口组包括DMRS端口0、1、2、3。其中，第一天线端口组中的DMRS端口4、5对应CDM组0，第一天线端口组中的DMRS端口6、7对应CMD组1；第二天线端口组中的DMRS端口0、1对应CDM组0，第二天线端口组中的DMRS端口2、3对应CDM组1。可见，第一天线端口组和第二天线端口组分别对应两个CDM组，且第一天线端口组和第二天线端口组对应的数量相同。第一天线端口组和第二天线端口组中属于同一个CDM组的DMRS端口对应的DMRS映射在相同的时频资源上。在另一种实现方式下，对于单符号、类型1 DMRS，第一天线端口组中包含的天线端口对应的天线端口索引也可以为8、9、10、11，以及第二天线端口组中包含的天线端口对应的天线端口索引为0、1、2、3。在又一种实现方式中，对于单符号、类型1 DMRS，第一天线端口组中包含的天线端口对应的天线端口索引为E、F、G、H，以及第二天线端口组中包含的天线端口对应的天线端口索引为A、B、C、D。
又如图6b所示，为本申请实施例提供的双符号、类型1DMRS的时频资源映射示意图，其中，通过DMRS端口扩容设计，可以支持的最大DMRS端口数目为16，分为2个天线端口组，每个天线端口组均包含8个DMRS端口。其中第一天线端口组包括DMRS端口8～15，第二天线端口组包括DMRS端口0～7。其中，第一天线端口组中的DMRS端口8、9、12、13对应CDM组0，第一天线端口组中的DMRS端口10、11、14、15对应CMD组1；第二天线端口组中的DMRS端口0、1、4、5对应CDM组0，第二天线端口组中的DMRS端口2、3、6、7对应CDM组1。可见，第一天线端口组和第二天线端口组分别对应两个CDM组，且第一天线端口组和第二天线端口组对应的数量相同。第一天线端口组和第二天线端口组中 属于同一个CDM组的DMRS端口对应的DMRS映射在相同的时频资源上。在另一种实现方式下，对于双符号、类型1 DMRS，第一天线端口组中包含的天线端口对应的天线端口索引为I、J、K、L、M、N、O，以及第二天线端口组中包含的天线端口对应的天线端口索引为A、B、C、D、E、F、G、H。
又如图7a所示，为本申请实施例提供的单符号、类型2DMRS的时频资源映射示意图，其中，通过DMRS端口扩容设计，可以支持的最大DMRS端口数目为12，分为2个天线端口组，每个天线端口组均包含6个DMRS端口。其中第一天线端口组包括DMRS端口6～11，第二天线端口组包括DMRS端口0～5。其中，第一天线端口组中的DMRS端口6、7对应CDM组0，第一天线端口组中的DMRS端口8、9对应CMD组1、第一天线端口组中的DMRS端口10、11对应CDM组2；第二天线端口组中的DMRS端口0、1对应CDM组0，第二天线端口组中的DMRS端口2、3对应CDM组1，第二天线端口组中的DMRS端口4、5对应CDM组2。可见，第一天线端口组和第二天线端口组分别对应三个CDM组，且第一天线端口组和第二天线端口组对应的数量相同。第一天线端口组和第二天线端口组中属于同一个CDM组的DMRS端口对应的DMRS映射在相同的时频资源上。在另一种实现方式下，对于单符号、类型2 DMRS，第一天线端口组中包含的天线端口对应的天线端口索引也可以为12、13、14、15、16、17，以及第二天线端口组中包含的天线端口对应的天线端口索引为0、1、2、3、4、5。在又一种实现方式中，对于单符号、类型1 DMRS，第一天线端口组中包含的天线端口对应的天线端口索引为G、H、I、J、K、L，以及第二天线端口组中包含的天线端口对应的天线端口索引为A、B、C、D、E、F。
又如图7b所示，为本申请实施例提供的双符号、类型2DMRS的时频资源映射示意图，其中，通过DMRS端口扩容设计，可以支持的最大DMRS端口数目为24，分为2个天线端口组，每个天线端口组均包含12个DMRS端口。其中第一天线端口组包括DMRS端口12～23，第二天线端口组包括DMRS端口0～11。其中，第一天线端口组中的DMRS端口12、13、18、19对应CDM组0，第一天线端口组中的DMRS端口14、15、20、21对应CMD组1、第一天线端口组中的DMRS端口16、17、22、23对应CDM组2；第二天线端口组中的DMRS端口0、1、6、7对应CDM组0，第二天线端口组中的DMRS端口2、3、8、9对应CDM组1，第二天线端口组中的DMRS端口4、5、10、11对应CDM组2。可见，第一天线端口组和第二天线端口组分别对应三个CDM组，且第一天线端口组和第二天线端口组对应的数量相同。第一天线端口组和第二天线端口组中属于同一个CDM组的DMRS端口对应的DMRS映射在相同的时频资源上。在另一种实现方式下，对于双符号、类型2 DMRS，第一天线端口组中包含的天线端口对应的天线端口索引为M、N、O、P、Q、R、S、T、U、V、W、X，以及第二天线端口组中包含的天线端口对应的天线端口索引为A、B、C、D、E、F、G、H、I、J、K、L。
需要说明的是，上述图6a、图6b、图7a和图7b仅为单/双符号、类型1/类型2DMRS的天线端口扩容设计的示例，其中的第一天线端口组和第二天线端口组中的端口索引也仅为示例，第一天线端口组和第二天线端口组中的端口索引没有严格的顺序关系。例如，第二天线端口组中的端口索引可以是已有的端口索引，第一天线端口组的端口索引可以与第二天线端口组中的端口索引是连续的，也可以是不连续的。
进一步地，第一关系中还包括与DCI中的天线端口字段的至少一个候选值中的每个候选值对应的不映射数据的DMRS码分复用组的数量。
对于不同的DMRS类型、不同的最大DMRS符号数量，有不同的第一关系。该第一关系可以表示为DMRS端口索引表。下面分别进行描述：
A.单符号、类型1DMRS：
网络设备在第一信令中携带dmrs-Type＝1，maxLength＝1，用于指示使用的DMRS类型为类型1 DMRS，最大DMRS符号数量为1。参考图3所示的DMRS端口扩容方法，扩容后可支持的正交DMRS端口总数目为8，在一种实现方式下，分别对应DMRS端口索引0～7。需要注意的是，这里的端口索引0～7也可以代表DMRS端口索引1000～1007。对于单符号、类型1DMRS，包括2个CDM组：CDM组0和CDM组1，每个CDM组包括4个DMRS端口，如图6a所示。其中，CDM组0包含DMRS端口0、1、4、5，CDM组1包含DMRS端口2、3、6、7。可以看出，对于未扩容的DRMS，共计支持4个DMRS端口，因此无法支持rank 5～8。而扩容后的DMRS，共计可以支持8个DMRS端口，因此可以单符号支持最大rank 8的传输。在一种实现方式下，DMRS扩容后，支持的DMRS端口索引也可以是其他的取值范围。例如支持的8个DMRS端口对应端口索引8～15，即表19～22所示的DMRS端口索引0-7也可以表示为索引8-15，其中索引0～7中的每一个值与索引8～15中的每一个值一一对应；或者表18～21所示的DMRS端口索引0-7也可以表示为索引0～3和8～11，即表18～21所示的DMRS端口索引4-7也可以表示为索引8-11，其中索引4～7中的每一个值与索引8～11中的每一个值一一对应。
对于单符号、类型1DMRS，不同的rank对应不同的DMRS端口索引表，如下表19～表22所示：
表19 dmrs-Type＝1,maxLength＝1，rank＝5对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝5，即rank5，可以支持最大5流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4；前置符号的数量为1(即DMRS端口0-4映射到1个符号上)。DMRS端口索引0-4中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,5；0,1,2,3,6；或者0,1,2,3,7。
其中，天线端口的取值为“0”是示例性的，可以取值为任意一个值，本申请对此不作限制。
可见，支持rank5，但只需映射到1个符号上，减少了符号的开销。
表20 dmrs-Type＝1,maxLength＝1，rank＝6对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝6，即rank6，可以支持最大6流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,6；前置符号的数量为1(即DMRS端口0,1,2,3,4,6映射到1个符号上)。DMRS端口索引0,1,2,3,4,6中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,4,7；0,1,2,3,5,6；或者0,1,2,3,5,7。
其中，天线端口的取值为“0”是示例性的，可以取值为任意一个值，本申请对此不作限制。
可见，支持rank6，但只需映射到1个符号上，减少了符号的开销。
表21 dmrs-Type＝1,maxLength＝1，rank＝7对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝7，即rank7，可以支持最大7流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6；前置符号的数量为1(即DMRS端口0,1,2,3,4,5,6映射到1个符号上)。DMRS端口索引0,1,2,3,4,5,6中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,4,5,7，或者0,1,2,3,4,6,7，或者 0,1,2,3,5,6,7。
其中，天线端口的取值为“0”是示例性的，可以取值为任意一个值，本申请对此不作限制。
可见，支持rank7，但只需映射到1个符号上，减少了符号的开销。
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝8，即rank8，可以支持最大8流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6,7；前置符号的数量为1(即DMRS端口0,1,2,3,4,5,6,7映射到1个符号上)。DMRS端口索引0,1,2,3,4,5,6,7中的端口索引还可以是其他的DMRS端口取值。
表22 dmrs-Type＝1,maxLength＝1，rank＝8对应的DMRS端口索引表
其中，天线端口的取值为“0”是示例性的，可以取值为任意一个值，本申请对此不作限制。
可见，支持rank8，但只需映射到1个符号上，减少了符号的开销。
B.双符号、类型1DMRS：
网络设备在第一信令中携带dmrs-Type＝1，maxLength＝2，用于指示使用的DMRS类型为类型1 DMRS，最大DMRS符号数量为2。参考前述的DMRS端口扩容方法，扩容后可支持的正交DMRS端口总数目为16，在一种实现方式下，分别对应DMRS端口索引0～15。需要注意的是，这里的端口索引0～15也可以代表DMRS端口索引1000～1015。对于双符号、类型1DMRS，包括2个CDM组：CDM组0和CDM组1，每个CDM组包括8个DMRS端口，如图6b所示。其中CDM组0包括DMRS端口0、1、4、5、8、9、12、13，CDM组1包括DMRS端口2、3、6、7、10、11、14、15。可以看出，对于未扩容的DRMS，一个CDM组共计支持4个DMRS端口，需要2个CDM组才可以支持rank 5～8。而扩容DMRS，一个CDM组共计支持8个DMRS端口，仅需1个CDM组就可以支持最大rank 8的传输。在一种实现方式下，DMRS扩容后，支持的DMRS端口索引也可以是其他的取值范围。例如支持的16个DMRS端口对应端口索引8～23，即表23～26所示的DMRS端口索引0～15也可以表示为索引8～23，其中索引0～15中的每一个值与索引8～23中的每一个值一一对应；或者支持的16个DMRS端口分别对应端口索引0～7和8～15。
对于双符号、类型1DMRS，不同的rank对应不同的DMRS端口索引表，如下表23～表26所示：
表23 dmrs-Type＝1,maxLength＝2，rank＝5对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝5，即rank5，可以支持最大5流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4；前置符号的数量为2(即DMRS端口0-4映射到2个符号上)。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的5个DMRS天线端口属于1个CDM组，剩余的一个CDM组对应的时频位置可以用于映射数据；DMRS端口索引为0,1,4,5,8；前置符号的数量为2(即DMRS端口0,1,4,5,8映射到2个符号上)。可见，支持rank5，其占用的前置符号的数量为2，但是只用了1个CDM组，减少了资源需求。DMRS端口索引0,1,4,5,8还可以是其他的DMRS端口取值，如0,1,4,5,9；0,1,4,5,12；0,1,4,5,13；2,3,6,7,10；2,3,6,7,11；2,3,6,7,14；2,3,6,7,15。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4；前置符号的数量为1(即DMRS端口0-4映射到1个符号上)。可见，支持rank5，但只需映射到1个符号上，减少了符号的开销。DMRS端口索引0-4中的端口索引还可以是其他的DMRS端口取值，如如0,1,2,3,5；0,1,2,3,6；或者0,1,2,3,7。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”、“2”对应的全部行，也可以包含上述取值为“0”、“1”、“2”中的一个或多个取值对应的行。
表24 dmrs-Type＝1,maxLength＝2，rank＝6对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝6，即rank6，可以支持最大6流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,6；前置符号的数量为2(即DMRS端口0,1,2,3,4,6映射到2个符号上)。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的6个DMRS天线端口被划分到1个CDM组，剩余的一个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,4,5,8,9；前置符号的数量为2(即DMRS端口0,1,4,5,8,9映射到2个符号上)。可见，支持rank6，其占用的前置符号的数量为2，但是只用了1个CDM组，减少了资源需求。DMRS端口索引0,1,4,5,8,9中的端口索引还可以是其他的DMRS端口取值，如0,1,4,5,12,13；0,1,4,5,8,12；0,1,4,5,9,13；或者2,3,6,7,10,11；2,3,6,7,14,15；2,3,6,7,10,14；2,3,6,7,11,15。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,6；前置符号的数量为1(即DMRS端口0,1,2,3,4,6映射到1个符号上)。可见，支持rank6，但只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,4,6中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,4,7；0,1,2,3,5,6；或者0,1,2,3,5,7。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”、“2”对应的全部行，也可以包含上述取值为“0”、“1”、“2”中的一个或多个取值对应的行。
表25 dmrs-Type＝1,maxLength＝2，rank＝7对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝7，即rank7，可以支持最大7流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6；前置符号的数量为2(即DMRS端口0,1,2,3,4,5,6映射到2个符号上)。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的7个DMRS天线端口属于1个CDM组，剩余的一个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,4,5,8,9,12；前置符号的数量为2(即DMRS端口0,1,4,5,8,9,12映射到2个符号上)。可见，支持rank7，其占用的前置符号的数量为2，但是只用了1个CDM组，减少了资源需求。DMRS端口索引0,1,4,5,8,9,12中的端口索引还可以是其他的DMRS端口取值，如0,1,4,5,8,9,13；0,1,4,5,8,12,13；0,1,4,5,9,12,13；或者2,3,6,7,10,11,14；2,3,6,7,10,11,15；2,3,6,7,10,14,15；2,3,6,7,11,14,15。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6；前置符号的数量为1(即DMRS端口0,1,2,3,4,5,6映射到1个符号上)。可见，支持rank6，但只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,4,5,6中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,4,5,7，或者0,1,2,3,4,6,7，或者0,1,2,3,5,6,7。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”、“2”对应的全部行，也可以包含上述取值为“0”、“1”、“2”中的一个或多个取值对应的行。
表26 dmrs-Type＝1,maxLength＝2，rank＝8对应的DMRS端口索引表

该DMRS端口索引表可用于上行/下行传输。
在这里，N＝8，即rank8，可以支持最大8流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6,7；前置符号的数量为2(即DMRS端口0,1,2,3,4,5,6,7映射到2个符号上)。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的8个DMRS天线端口属于1个CDM组，剩余的一个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,4,5,8,9,12,13；前置符号的数量为2(即DMRS端口0,1,4,5,8,9,12,13映射到2个符号上)。可见，支持rank8，其占用的前置符号的数量为2，但是只用了1个CDM组，减少了资源需求。DMRS端口索引0,1,4,5,8,9,12,13中的端口索引还可以是其他的DMRS端口取值，如2,3,6,7,10,11,14,15。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6,7；前置符号的数量为1(即DMRS端口0,1,2,3,4,5,6,7映射到1个符号上)。可见，支持rank7，但只需映射到1个符号上，减少了符号的开销。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”、“2”对应的全部行，也可以包含上述取值为“0”、“1”、“2”中的一个或多个取值对应的行。
C.单符号、类型2DMRS：
网络设备在第一信令中携带dmrs-Type＝2，maxLength＝1，用于指示使用的DMRS类型为类型2 DMRS，最大DMRS符号数量为1。参考前述的DMRS端口扩容方法，扩容后可支持的正交DMRS端口总数目为12，在一种实现方式下，分别对应DMRS端口索引0～11。需要注意的是，这里的端口索引0～11也可以代表DMRS端口索引1000～1011。对于单符号、类型2DMRS，包括3个CDM组：CDM组0、CDM组1和CDM组2，每个CDM组包括4个DMRS端口，如图7a所示。其中CDM组0包含DMRS端口0、1、6、7，CDM组1包含DMRS端口2、3、8、9，CDM组2包含DMRS端口4、5、10、11。可以看出，对于未扩容的DRMS，一个CDM组共计支持2个DMRS端口，因此无法支持rank 5～8。为了支持rank 5～6至少需要3个CDM组。而扩容DMRS，一个CDM组共计支持4个DMRS端口，因此可以单符号3个CDM组支持最大rank 8的传输。在一种实现方式下，DMRS扩容后，支持的DMRS端口索引也可以是其他的取值范围。例如支持的12个DMRS端口对应端口索引12～23，即表27～30所示的DMRS端口索引0～11也可以表示为索引12～23，其中索引0～11中的每一个值与索引12～23中的每一个值一一对应；或者支持的12个DMRS端口分别对应端口索引0～5和12～17，即表26～29所示的DMRS端口索引6～11也可以表示为索引12～17，其中索引6～11中的每一个值与索引12～17中的每一个值一一对应。
对于单符号、类型2DMRS，不同的rank对应不同的DMRS端口索引表，如下表27～表30所示：
表27 dmrs-Type＝2,maxLength＝1，rank＝5对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝5，即rank5，可以支持最大5流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的5个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4；前置符号的数量为1(即DMRS端口0-4映射到1个符号上)。可见，支持rank5，但只需映射到1个符号上，减少了符号的开销。DMRS端口索引0-4中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,5。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6；前置符号的数量为1(即DMRS端口0,1,2,3,6映射到1个符号上)。可见，支持rank5，其占用的前置符号的数量为1，且只用了2个CDM组，减少了资源需求；且只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,6中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,7；0,1,2,3,8；0,1,2,3,9。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”对应的全部行，也可以包含上述取值为“0”、“1”中的一个或多个取值对应的行。
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝6，即rank6，可以支持最大6流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的6个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-5；前置符号的数量为1(即DMRS端口0-5映射到1个符号上)。可见，支持rank6，但只需映射到1个符号上，减少了符号的开销。
表28 dmrs-Type＝2,maxLength＝1，rank＝6对应的DMRS端口索引表
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,8；前置符号的数量为1(即DMRS端口0,1,2,3,6,8映射到1个符号上)。可见，支持rank6，其占用的前置符号的数量为1，且只用了2个CDM组，减少了资源需求；且只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,6,8中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,7,9；0,1,2,3,6,7；0,1,2,3,8,9。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”对应的全部行，也可以包含上述取值为“0”、“1”中的一个或多个取值对应的行。
表29 dmrs-Type＝2,maxLength＝1，rank＝7对应的DMRS端口索引表

该DMRS端口索引表可用于上行/下行传输。
在这里，N＝7，即rank7，可以支持最大7流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的7个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6；前置符号的数量为1(即DMRS端口0,1,2,3,4,5,6映射到1个符号上)。可见，支持rank7，但只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,4,5,6中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,4,5,7；0,1,2,3,4,5,8；0,1,2,3,4,5,9；0,1,2,3,4,5,10；0,1,2,3,4,5,11。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,7,8；前置符号的数量为1(即DMRS端口0,1,2,3,6,7,8映射到1个符号上)。可见，支持rank7，其占用的前置符号的数量为1，且只用了2个CDM组，减少了资源需求；且只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,6,7,8中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,6,7,9；0,1,2,3,6,8,9；0,1,2,3,7,8,9。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”对应的全部行，也可以包含上述取值为“0”、“1”中的一个或多个取值对应的行。
表30 dmrs-Type＝2,maxLength＝1，rank＝8对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝8，即rank8，可以支持最大8流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的8个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6,8；前置符号的数量为1(即DMRS端口0,1,2,3,4,5,6,8映射到1个符号上)。可见，支持rank8，但只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,4,5,6,8中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,4,5,7,9；0,1,2,3,4,5,8,10；0,1,2,3,4,5,9,11；0,1,2,3,4,5,6,10；0,1,2,3,4,5,7,11。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,7,8,9；前置符号的数量为1(即DMRS端口0,1,2,3,6,7,8,9映射到1个符号上)。可见，支持rank8，其占用的前置符号的数量为1，但是只用了2个CDM组，减少了资源需求；且只需映射到1个符号上，减少了符号的开销。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”对应的全部行，也可以包含上述取值为“0”、“1”中的一个或多个取值对应的行。
D.双符号、类型2DMRS
网络设备在第一信令中携带dmrs-Type＝2，maxLength＝2，用于指示使用的DMRS类型为类型2 DMRS，最大DMRS符号数量为2。参考前述的DMRS端口扩容方法，扩容后可支持的正交DMRS端口总数目为24，在一种实现方式下，分别对应DMRS端口索引0～23。需要注意的是，这里的端口索引0～23也可以代表DMRS端口索引1000～1023。对于双符号、类型2DMRS，包括3个CDM组：CDM组0、CDM组1和CDM组2，每个CDM组包括8个DMRS端口，如图7b所示。其中CDM组0包含DMRS端口0、1、6、7、12、13、18、19，CDM组1包含DMRS端口2、3、8、9、14、15、20、21，CDM组2包含DMRS端口4、5、10、11、16、17、22、23。可以看出，对于未扩容的DRMS，一个CDM组共计支持4个DMRS端口，因此为了支持rank 5～8至少需要2个CDM组。而扩容DMRS，一个CDM组共计支持8个DMRS端口，因此可以1个CDM组支持最大rank 8的传输。在一种实现方式下，DMRS扩容后，支持的DMRS端口索引也可以是其他的取值范围。例如支持的24个DMRS端口对应端口索引12～35，即表31～34所示的DMRS端口索引0～23也可以表示为索引12～35，其中索引0～23中的每一个值与索引12～35中的每一个值一一对应；或者支持的24个DMRS端口分别对应端口索引0～11和12～23。
对于双符号、类型2DMRS，不同的rank对应不同的DMRS端口索引表，如下表31～表34所示：
表31 dmrs-Type＝2,maxLength＝2，rank＝5对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝5，即rank5，可以支持最大5流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的5个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4；前置符号的数量为1(即DMRS端口0-4映射到1个符号上)。可见，支持rank5，但只需映射到1个符号上，减少了符号的开销。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6；前置符号的数量为2(即DMRS端口0,1,2,3,6映射到2个符号上)。可见，支持rank5，其占用的前置符号的数量为2，但是只用了2个CDM组，减少了资源需求。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6；前置符号的数量为1(即DMRS端口0,1,2,3,6映射到1个符号上)。可见，支持rank5，其占用的前置符号的数量为1，且只用了2个CDM组，减少了资源需求；且只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,6中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,7；0,1,2,3,8；0,1,2,3,9。
天线端口的取值为“3”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的5个DMRS天线端口属于1个CDM组，剩余的2个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,6,7,12； 前置符号的数量为2(即DMRS端口0,1,6,7,12映射到2个符号上)。可见，支持rank5，其占用的前置符号的数量为2，但是只用了1个CDM组，减少了资源需求。DMRS端口索引0,1,6,7,12中的端口索引还可以是其他的DMRS端口取值，如0,1,6,7,13；0,1,6,7,18；0,1,6,7,19。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”“2”、“3”对应的全部行，也可以包含上述取值为“0”、“1”、“2”、“3”中的一个或多个取值对应的行。
表32 dmrs-Type＝2,maxLength＝2，rank＝6对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝6，即rank6，可以支持最大6流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的6个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-5；前置符号的数量为1(即DMRS端口0-5映射到1个符号上)。可见，支持rank6，但只需映射到1个符号上，减少了符号的开销。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,8；前置符号的数量为2(即DMRS端口0,1,2,3,6,8映射到2个符号上)。可见，支持rank6，其占用的前置符号的数量为2，但是只用了2个CDM组，减少了资源需求。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,8；前置符号的数量为1(即DMRS端口0,1,2,3,6,8映射到1个符号上)。可见，支持rank6，其占用的前置符号的数量为1，且只用了2个CDM组，减少了资源需求；且只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,6,8中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,7,9；0,1,2,3,6,7；0,1,2,3,8,9。
天线端口的取值为“3”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的6个DMRS天线端口属于1个CDM组，剩余的2个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,6,7,12,13；前置符号的数量为2(即DMRS端口0,1,6,7,12,13映射到2个符号上)。可见，支持rank6，其占用的前置符号的数量为2，但是只用了1个CDM组，减少了资源需求。DMRS端口索引0,1,6,7,12,13中的端口索引还可以是其他的DMRS端口取值，如0,1,6,7,18,19；0,1,6,7,12,18；0,1,6,7,13,19；0,1,6,7,12,19；0,1,6,7,13,18。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”“2”、“3”对应的全部行，也可以包含上述取值为“0”、“1”、“2”、“3”中的一个或多个取值对应的行。
表33 dmrs-Type＝2,maxLength＝2，rank＝7对应的DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝7，即rank7，可以支持最大7流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，剩余的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,7,8；前置符号的数量为2(即DMRS端口0,1,2,3,6,7,8映射到2个符号上)。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,7,8；前置符号的数量为1(即DMRS端口0,1,2,3,6,7,8映射到1个符号上)。可见，支持rank7，但只需映射到1个符号上，减少了符号的开销。DMRS端口索引0,1,2,3,6,7,8中的端口索引还可以是其他的DMRS端口取值，如0,1,2,3,6,7,9；0,1,2,3,6,8,9；0,1,2,3,7,8,9。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的7个DMRS天线端口属于1个CDM组，剩余的2个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,6,7,12,13,18；前置符号的数量为2(即DMRS端口0,1,6,7,12,13,18映射到2个符号上)。可见，支持rank7，其占用的前置符号的数量为2，但是只用了1个CDM组，减少了资源需求。DMRS端口索引0,1,6,7,12,13,18中的端口索引还可以是其他的DMRS端口取值，如0,1,6,7,12,13,19；0,1,6,7,12,18,19；0,1,6,7,13,18,19。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”、“2”对应的全部行，也可以包含上述取值为“0”、“1”、“2”中的一个或多个取值对应的行。
表34 dmrs-Type＝2,maxLength＝2，rank＝8对应DMRS端口索引表
该DMRS端口索引表可用于上行/下行传输。
在这里，N＝8，即rank8，可以支持最大8流的传输。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，剩余的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,7,8,9；前置符号的数量为2(即DMRS端口0,1,2,3,6,7,8,9映射到2个符号上)。可见，支持rank8，其占用的前置符号的数量为2，但是只用了2个CDM组，减少了资源需求。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，剩余的一个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,2,3,6,7,8；前置符号的数量为1(即DMRS端口0,1,2,3,6,7,8映射到1个符号上)。可见，支持rank8，但只需映射到1个符号上，减少了符号的开销；且只用了2个CDM组，减少了资源需求。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的8个DMRS天线端口属于1个CDM组，剩余的2个CDM组对应的时频资源可用于映射数据；DMRS端口索引为0,1,6,7,12,13,18,19；前置符号的数量为2(即DMRS端口0,1,6,7,12,13,18,19映射到2个符号上)。可见，支持rank8，其占用的前置符号的数量为2，但是只用了1个CDM组，减少了资源需求。
该表可以包含上述取值为“0”、“1”、“2”对应的全部行，也可以包含上述取值为“0”、“1”、“2”中的一个或多个取值对应的行。
对于单符号、类型1对应的DMRS端口索引表还可以如下表35所示：
表35 Antenna port(s)(1000+DMRS port),dmrs-Type＝1,maxLength＝1对应的DMRS端口索引表
该表可用于下行DMRS传输的端口指示。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,6。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6。
天线端口的取值为“3”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6,7。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”、“1”、“2”、“3”对应的全部行，也可以包含上述取值为“0”、“1”、“2”、“3”中的一个或多个取值对应的行。
对于双符号、类型2的DMRS端口索引表还可以如下表36所示：
该表可用于下行DMRS传输的端口指示。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4；前置符号的数量为2(即DMRS端口0-4映射到2个符号上)。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,6；前置符号的数量为2(即DMRS端口0,1,2,3,4,6映射到2个符号上)。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线 端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6；前置符号的数量为2(即DMRS端口0,1,2,3,4,5,6映射到2个符号上)。
天线端口的取值为“3”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6,7；前置符号的数量为2(即DMRS端口0,1,2,3,4,5,6,7映射到2个符号上)。
天线端口的取值为“4”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的5个DMRS天线端口属于1个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,4,5,8；前置符号的数量为2(即DMRS端口0,1,4,5,8映射到2个符号上)。可见，支持rank5，但是只用了1个CDM组，减少了资源需求。
天线端口的取值为“5”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的6个DMRS天线端口属于1个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,4,5,8,9；前置符号的数量为2(即DMRS端口0,1,4,5,8,9映射到2个符号上)。可见，支持rank6，但是只用了1个CDM组，减少了资源需求。
天线端口的取值为“6”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的7个DMRS天线端口属于1个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,4,5,8,9,12，前置符号的数量为2(即DMRS端口0,1,4,5,8,9,12映射到2个符号上)。可见，支持rank7，但是只用了1个CDM组，减少了资源需求。
天线端口的取值为“7”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的8个DMRS天线端口属于1个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,4,5,8,9,12,13；前置符号的数量为2(即DMRS端口0,1,4,5,8,9,12,13映射到2个符号上)。可见，支持rank8，但是只用了1个CDM组，减少了资源需求。
天线端口的取值为“8”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4；前置符号的数量为1(即DMRS端口0-4映射到1个符号上)。可见，支持rank5，但是只映射到1个符号上，减少了符号开销。
天线端口的取值为“9”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,6；前置符号的数量为1(即DMRS端口0,1,2,3,4,6映射到1个符号上)。可见，支持rank6，但是只映射到1个符号上，减少了符号开销。
天线端口的取值为“10”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6；前置符号的数量为1(即DMRS端口0,1,2,3,4,5,6映射到1个符号上)。可见，支持rank6，但是只映射到1个符号上，减少了符号开销。
表36 Antenna port(s)(1000+DMRS port),dmrs-Type＝1,maxLength＝2对应的DMRS端口索引表

天线端口的取值为“11”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6,7；前置符号的数量为1(即DMRS端口0,1,2,3,4,5,6,7映射到1个符号上)。可见，支持rank8，但是只映射到1个符号上，减少了符号开销。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”～“11”对应的全部行，也可以包含上述取值为“0”～“11”中的一个或多个取值对应的行。
对于单符号、类型2的DMRS端口索引表还可以如下表37所示：
该表可用于下行DMRS传输的端口指示。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的5个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的6个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-5。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6。可见，支持rank5，但是只占用了2个CDM组，减少了资源需求。
天线端口的取值为“3”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,8。可见，支持rank6，但是只占用了2个CDM组，减少了资源需求。
天线端口的取值为“4”，用于指示：不映射数据的DMRS CDM组的数量为3，即配置的7个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6。
表37 Antenna port(s)(1000+DMRS port),dmrs-Type＝2,maxLength＝1对应的DMRS端口索引表
天线端口的取值为“5”，用于指示：不映射数据的DMRS CDM组的数量为2，即配置的7个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,7,8。可见，支持rank7，但是只占用了2个CDM组，减少了资源需求。
天线端口的取值为“6”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的8个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0,1,2,3,4,5,6,8。
天线端口的取值为“7”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,7,8,9。可见，支持rank8，但是只占用了2个CDM组，减少了资源需求。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”～“8”对应的全部行，也可以包含上述取值为“0”～“8”中的一个或多个取值对应的行。
对于双符号、类型2的DMRS端口索引表还可以如下表38所示：
该表可用于下行DMRS传输的端口指示。
在该表中，天线端口的取值为“0”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的5个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-4；前置符号的数量为1(即DMRS端口0-4映射到1个符号上)。可见，支持rank5，但是只映射到1个符号上，减少了符号开销。
天线端口的取值为“1”，用于指示：不映射数据的DMRS CDM组的数量为3，配置的6个DMRS天线端口属于3个CDM组，没有额外的CDM组对应的时频资源用于映射数据；DMRS端口索引为0-5；前置符号的数量为1(即DMRS端口0-5映射到1个符号上)。可见，支持rank6，但是只映射到1个符号上，减少了符号开销。
天线端口的取值为“2”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6；前置符号的数量为2(即DMRS端口0,1,2,3,6映射到2个符号上)。可见，支持rank5，但是只占用两个CDM组，减少了资源需求。
天线端口的取值为“3”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的6个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,8；前置符号的数量为2(即DMRS端口0,1,2,3,6,8映射到2个符号上)。可见，支持rank6，但是只占用两个CDM组，减少了资源需求。
天线端口的取值为“4”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,7,8；前置符号的数量为2(即DMRS端口0,1,2,3,6,7,8映射到2个符号上)。可见，支持rank7，但是只用了2个CDM组，减少了资源需求。
天线端口的取值为“5”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,7,8,9；前置符号的数量为2(即DMRS端口0,1,2,3,6,7,8,9映射到2个符号上)。可见，支持rank8，但是只用了2个CDM组，减少了资源需求。
天线端口的取值为“6”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的5个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6；前置符号的数量为1(即DMRS端口0,1,2,3,6映射到1个符号上)。可见，支持rank7，但是只用了1个CDM组，减少了资源需求；且DMRS端口只映射到1个符号上，减少了符号开销。
天线端口的取值为“7”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的5个DMRS天线端口属于1个CDM组，剩余的2个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,6,7,12，前置符号的数量为2(即DMRS端口0,1,6,7,12映射到2个符号上)。可见，支持rank8，但是只用了1个CDM组，减少了资源需求。
天线端口的取值为“8”，用于指示：不映射数据的DMRS CDM组的数量为2，即配置的6个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,8；前置符号的数量为1(即DMRS端口0,1,2,3,6,8映射到1个符号上)。可见，支持rank5，但是只映射到1个符号上，减少了符号开销；且只用了2个CDM组，减少了资源需求。
天线端口的取值为“9”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的6个DMRS天线端口属于1个CDM组，剩余的2个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,6,7,12,13；前置符号的数量为2(即DMRS端口0,1,6,7,12,13映射到2个符号上)。可见，支持rank6，但是只用了1个CDM组，减少了资源需求。
天线端口的取值为“10”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的7个DMRS天 线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,7,8；前置符号的数量为1(即DMRS端口0,1,2,3,6,7,8映射到1个符号上)。可见，支持rank7，但是只映射到1个符号上，减少了符号开销；且只用了2个CDM组，减少了资源需求。
表38 Antenna port(s)(1000+DMRS port),dmrs-Type＝2,maxLength＝2对应的DMRS端口索引表
天线端口的取值为“11”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的7个DMRS天线端口属于1个CDM组，剩余的2个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,6,7,12,13,18；前置符号的数量为2(即DMRS端口0,1,6,7,12,13,18映射到2个符号上)。可见，支持rank7，但是只用了1个CDM组，减少了资源需求。
天线端口的取值为“12”，用于指示：不映射数据的DMRS CDM组的数量为2，配置的8个DMRS天线端口属于2个CDM组，剩余的1个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,2,3,6,7,8,9；前置符号的数量为1(即DMRS端口0,1,2,3,6,7,8,9映射到1个符号上)。可见，支持rank8，但是只映射到1个符号上，减少了符号开销；且只用了2个CDM组，减少了资源需求。
天线端口的取值为“13”，用于指示：不映射数据的DMRS CDM组的数量为1，配置的8个DMRS天线端口属于1个CDM组，剩余的2个CDM组对应的时频资源可以用于映射数据；DMRS端口索引为0,1,6,7,12,13,18,19；前置符号的数量为2(即DMRS端口0,1,6,7,12,13,18,19映射到2个符号上)。可见，支持rank8，但是只用了1个CDM组，减少了资源需求。
上述天线端口的取值是示例性的，可以取值为任意一个值，本申请对此不作限制。
该表可以包含上述取值为“0”～“13”对应的全部行，也可以包含上述取值为“0”～“13”中的一个或多个取值对应的行。
在上述DMRS端口索引表中，表格中DMRS端口一列表示的端口取值与实际调度的DMRS端口索引关系为：DMRS端口索引＝1000+DMRS port。
S503.网络设备发送DCI。
其中，DCI包括天线端口字段，该天线端口字段用于指示DCI中的天线端口字段的至少一个候选值中的一个值。
网络设备在PUSCH/PDSCH资源分配过程中，为终端分配用于解调PUSCH/PDSCH的DMRS天线端口号。
网络设备还可以计算本时隙该终端被调度位置对应的不能用于传输PUSCH/PDSCH的DMRS打孔位置，即不映射数据的DMRS码分复用组的数量。
S504.终端接收到DCI后，根据指示的一个值，确定与指示的一个值对应的天线端口。
终端通过盲检，检测到PDCCH中携带的DCI后，解析并获取其中天线端口字段的值。
终端根据获取的dmrs-Type和maxLength的值，确定参照如前所述的表19-表38中的其中一个表格中的第一关系，并根据DCI中携带的天线端口字段指示的一个值，确定与指示的一个值对应的天线端口，即确定表格对应的行。
S505.网络设备发送确定的天线端口对应的DMRS。
相应地，终端接收确定的天线端口对应的DMRS。
以下行传输为例，网络设备和终端确定DMRS的天线端口后，则网络设备按照协议约定的DMRS信号产生方法产生对应的DMRS信号，按预设的方法进行时频资源映射，并发送天线端口对应DMRS，以及终端接收天线端口对应的DMRS。其中，该天线端口对应的DMRS用于解调天线端口对应的数据。
根据本申请实施例提供的一种DMRS端口指示方法，实现了大于4流的DMRS天线端口的指示。
上文描述了DMRS端口指示方法，该方法也可以用于其它的参考信号例如探测参考信号(sounding reference signal，SRS)、信道状态信息-参考信号(channel state information-reference signal，CSI-RS)等的端口指示，本申请对此不作限制。
可以理解的是，为了实现上述实施例中的功能，终端、网络设备包括了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本申请中所公开的实施例描述的各示例的单元及方法步骤，本申请能够以硬件或硬件和计算机软件相结合的形式来实现。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场景和设计约束条件。
图8-图11为本申请的实施例提供的可能的DMRS端口指示装置的结构示意图。这些DMRS端口指示装置可以用于实现上述方法实施例中终端或网络设备的功能，因此也能实现上述方法实施例所具备的有益效果。
如图8所示，为本申请实施例提供的一种DMRS端口指示装置的结构示意图，该DMRS端口指示装置800包括收发单元801和处理单元802。
该DMRS端口指示装置用于实现如图5所示实施例中的终端的功能时，所述收发单元801，用于执行图5所示实施例的步骤S503和S505中终端所执行的功能；处理单元802用于执行图5所示实施例的步骤S501、S502和S504。
该DMRS端口指示装置用于实现如图5所示实施例中的网络设备的功能时，收发单元801用于执行图5所示实施例的步骤S503和S505中网络设备所执行的功能。
根据本申请实施例提供的一种DMRS端口指示装置，实现了大于4流的DMRS天线端口的指示。
图9示出了一种简化的终端的结构示意图。为便于理解和图示方便，图9中，终端以手机作为例子。如图9所示，终端包括处理器、存储器、射频电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对终端进行控制，执行软件程序，处理软件程序的数据等。存储器主要用于存储软件程序和数据。射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。示例性地，有些种类的终端可以不具有输入输出装置。
当发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。为便于说明，图9中仅示出了一个存储器和处理器。在实际的终端产品中，可以存在一个或多个处理器和一个或多个存储器。存储器也可以称为存储介质或者存储设备等。存储器可以是独立于处理器设置，也可以是与处理器集成在一起，本申请实施例对此不做限制。
在本申请实施例中，可以将具有收发功能的天线和射频电路视为终端的接收单元和发送单元(也可以统称为收发单元)，将具有处理功能的处理器视为终端的处理单元。如图9所示，终端包括收发单元901和处理单元902。收发单元901也可以称为接收/发送(发射)器、接收/发送机、接收/发送电路等。处理单元902也可以称为处理器，处理单板，处理模块、处理装置等。该收发单元901用于实现图8所示实施例中收发单元801的功能；该处理单元902用于实现图8所示实施例中处理单元802的功能。
例如，在一个实施例中，收发单元901用于执行图5所示实施例的步骤S503和S505中终端所执行的功能；处理单元902用于执行图5所示实施例的步骤S501、S502和S504。
图10示出了一种简化的网络设备的结构示意图。网络设备包括射频信号收发及转换部分以及1002部 分，该射频信号收发及转换部分又包括收发单元1001部分。射频信号收发及转换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；1002部分主要用于基带处理，对网络设备进行控制等。收发单元1001也可以称为接收/发送(发射)器、接收/发送机、接收/发送电路等。1002部分通常是网络设备的控制中心，通常可以称为处理单元，用于控制网络设备执行上述图5中关于网络设备所执行的步骤。具体可参见上述相关部分的描述。收发单元1001可用于实现图8所示实施例中收发单元801的功能，1002部分用于实现图8所示实施例中处理单元802的功能。
1002部分可以包括一个或多个单板，每个单板可以包括一个或多个处理器和一个或多个存储器，处理器用于读取和执行存储器中的程序以实现基带处理功能以及对网络设备的控制。若存在多个单板，各个单板之间可以互联以增加处理能力。作为一种可选的实施方式，也可以是多个单板共用一个或多个处理器，或者是多个单板共用一个或多个存储器，或者是多个单板同时共用一个或多个处理器。
例如，在一个实施例中，收发单元1001用于执行图5所示实施例的步骤S503和S505中网络设备所执行的功能。
如图11所示，为本申请实施例提供的另一种DMRS端口指示装置的结构示意图，DMRS端口指示装置1100包括处理器1101和接口电路1102。处理器1101和接口电路1102之间相互耦合。可以理解的是，接口电路1102可以为收发器或输入输出接口。可选的，DMRS端口指示装置1100还可以包括存储器1103，用于存储处理器1101执行的指令或存储处理器1101运行指令的输入数据或存储处理器1101运行指令后产生的数据。
当DMRS端口指示装置1100用于实现图5所示的方法时，处理器1101用于实现上述处理单元802的功能，接口电路1102用于实现上述收发单元801的功能。
当上述DMRS端口指示装置为应用于终端的芯片时，该芯片用于实现上述方法实施例中终端的功能。该芯片从终端中的其它模块(如射频模块或天线)接收信息，该信息是网络设备或其它设备发送给终端的；或者，该芯片向终端中的其它模块(如射频模块或天线)发送信息，该信息是终端发送给网络设备或其它设备的。
当上述DMRS端口指示装置为应用于网络设备的芯片时，该芯片用于实现上述方法实施例中网络设备的功能。该芯片从网络设备中的其它模块(如射频模块或天线)接收信息，该信息是终端或其它设备发送给网络设备的；或者，该芯片向网络设备中的其它模块(如射频模块或天线)发送信息，该信息是网络设备发送给终端或其它设备的。
可以理解的是，本申请的实施例中的处理器可以是中央处理单元(central processing unit，CPU)，还可以是其它通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其它可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。通用处理器可以是微处理器，也可以是任何常规的处理器。
根据本申请实施例提供的一种DMRS端口指示装置，实现了大于4流的DMRS天线端口的指示。
本申请的实施例中的方法步骤可以通过硬件的方式来实现，也可以由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器、闪存、只读存储器、可编程只读存储器、可擦除可编程只读存储器、电可擦除可编程只读存储器、寄存器、硬盘、移动硬盘、只读光盘(compact disc read-only memory，CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于第一节点中。当然，处理器和存储介质也可以作为分立组件存在于终端中。
本申请实施例还提供了一种通信系统，包括上述DMRS端口指示装置。
本申请实施例还提供了一种计算机可读存储介质，其上存储有计算机程序或指令，该程序或指令被处理器执行时，使得上述实施例所述的方法被执行。
本申请实施例还提供了一种计算机程序产品，当其在计算设备上执行时，使得上述实施例所述的方法被执行。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机程序或指令。在计算机上加载和执行所述计算机程序或指令时，全部或部分地执行本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、网络设备、终端或者其它可编程装置。所 述计算机程序或指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机程序或指令可以从一个网站站点、计算机、服务器或数据中心通过有线或无线方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是集成一个或多个可用介质的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，例如，软盘、硬盘、磁带；也可以是光介质，例如，数字视频光盘；还可以是半导体介质，例如，固态硬盘。
在本申请的各个实施例中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
本申请中，“至少一个”是指一个或者多个，“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。在本申请的文字描述中，字符“/”，一般表示前后关联对象是一种“或”的关系；在本申请的公式中，字符“/”，表示前后关联对象是一种“相除”的关系。
可以理解的是，在本申请的实施例中涉及的各种数字编号仅为描述方便进行的区分，并不用来限制本申请的实施例的范围。上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定。

Claims (34)

  1. 一种DMRS端口指示方法，其特征在于，所述方法包括：
    获取解调参考信号DMRS的类型dmrs-Type和前置DMRS允许的最大时域符号长度maxLength；
    确定第一关系，其中，所述第一关系与所述dmrs-Type和所述maxLength具有关联关系，所述第一关系中包括天线端口字段的至少一个候选值、及与所述天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，所述每个候选值对应的候选天线端口的数量大于或等于N，所述每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，其中，所述第一天线端口组和所述第二天线端口组包括的天线端口的数量相同，所述第一天线端口组和所述第二天线端口组分别对应至少两个码分复用组，且所述第一天线端口组和所述第二天线端口组对应的码分复用组的数量相同，所述N大于4；
    接收下行控制信息DCI，所述DCI包括所述天线端口字段，所述天线端口字段用于指示所述DCI中的天线端口字段的至少一个候选值中的一个值；
    根据所述指示的一个值，确定与所述指示的一个值对应的天线端口；
    接收所述确定的天线端口对应的DMRS。
  2. 根据权利要求1所述的方法，其特征在于，所述获取dmrs-Type和maxLength，包括：
    接收第一信令，所述第一信令包括所述dmrs-Type和所述maxLength。
  3. 一种DMRS端口指示方法，其特征在于，所述方法包括：
    获取解调参考信号DMRS的类型dmrs-Type和前置DMRS允许的最大时域符号长度maxLength；
    确定第一关系，其中，所述第一关系与所述dmrs-Type和所述maxLength具有关联关系，所述第一关系中包括天线端口字段的至少一个候选值、及与所述天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，所述每个候选值对应的候选天线端口的数量大于或等于N，所述每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，其中，所述第一天线端口组和所述第二天线端口组包括的天线端口的数量相同，所述第一天线端口组和所述第二天线端口组分别对应至少两个码分复用组，且所述第一天线端口组和所述第二天线端口组对应的码分复用组的数量相同，所述N大于4；
    发送下行控制信息DCI，所述DCI包括所述天线端口字段，所述天线端口字段用于指示所述DCI中的天线端口字段的至少一个候选值中的一个值；
    根据所述指示的一个值，确定与所述指示的一个值对应的天线端口；
    发送所述确定的天线端口对应的DMRS。
  4. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    发送第一信令，所述第一信令包括所述dmrs-Type和所述maxLength。
  5. 一种DMRS端口指示装置，其特征在于，所述装置包括：处理单元和收发单元；其中：
    所述处理单元，用于获取解调参考信号DMRS的类型dmrs-Type和前置DMRS允许的最大时域符号长度maxLength；
    所述处理单元，还用于确定第一关系，其中，所述第一关系与所述dmrs-Type和所述maxLength具有关联关系，所述第一关系中包括天线端口字段的至少一个候选值、及与所述天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，所述每个候选值对应的候选天线端口的数量大于或等于N，所述每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，其中，所述第一天线端口组和所述第二天线端口组包括的天线端口的数量相同，所述第一天线端口组和所述第二天线端口组分别对应至少两个码分复用组，且所述第一天线端口组和所述第二天线端口组对应的码分复用组的数量相同，所述N大于4；
    所述收发单元，用于接收下行控制信息DCI，所述DCI包括所述天线端口字段，所述天线端口字段用于指示所述DCI中的天线端口字段的至少一个候选值中的一个值；
    所述处理单元，还用于根据所述指示的一个值，确定与所述指示的一个值对应的天线端口；
    所述收发单元，还用于接收所述确定的天线端口对应的DMRS。
  6. 根据权利要求5所述的装置，其特征在于，所述收发单元，还用于接收第一信令，所述第一信令包 括所述dmrs-Type和所述maxLength。
  7. 一种DMRS端口指示装置，其特征在于，所述装置包括：处理单元和收发单元；其中：
    所述处理单元，用于获取解调参考信号DMRS的类型dmrs-Type和前置DMRS允许的最大时域符号长度maxLength；
    所述处理单元，还用于确定第一关系，其中，所述第一关系与所述dmrs-Type和所述maxLength具有关联关系，所述第一关系中包括天线端口字段的至少一个候选值、及与所述天线端口字段的至少一个候选值中的每个候选值对应的候选天线端口，其中，所述每个候选值对应的候选天线端口的数量大于或等于N，所述每个候选值对应的候选天线端口包括在第一天线端口组和/或第二天线端口组中，其中，所述第一天线端口组和所述第二天线端口组包括的天线端口的数量相同，所述第一天线端口组和所述第二天线端口组分别对应至少两个码分复用组，且所述第一天线端口组和所述第二天线端口组对应的码分复用组的数量相同，所述N大于4；
    所述收发单元，还用于发送下行控制信息DCI，所述DCI包括所述天线端口字段，所述天线端口字段用于指示所述DCI中的天线端口字段的至少一个候选值中的一个值；
    所述处理单元，还用于根据所述指示的一个值，确定与所述指示的一个值对应的天线端口；
    所述收发单元，还用于发送所述确定的天线端口对应的DMRS。
  8. 根据权利要求7所述的装置，其特征在于，所述收发单元，还用于发送第一信令，所述第一信令包括所述dmrs-Type和所述maxLength。
  9. 根据权利要求1-8中任一项所述的方法或装置，其特征在于，所述每个候选值对应的候选天线端口的数量均为N。
  10. 根据权利要求1-9中任一项所述的方法或装置，其特征在于，所述第一关系中还包括与所述DCI中的天线端口字段的至少一个候选值中的每个候选值对应的不映射数据的DMRS码分复用组的数量。
  11. 根据权利要求10所述的方法或装置，其特征在于，所述至少一个候选值对应的候选天线端口对应的DMRS映射在一个符号上，且所述至少一个候选值对应的候选天线端口属于两个DMRS码分复用组；或
    所述至少一个候选值对应的候选天线端口对应的DMRS映射在两个符号上，且所述至少一个候选值对应的候选天线端口属于一个DMRS码分复用组。
  12. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为1，所述N为5；
    所述天线端口字段的取值为第一值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-4。
  13. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为1，所述N为6；
    所述天线端口字段的取值为第二值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,4,6。
  14. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为1，所述N为7；
    所述天线端口字段的取值为第三值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-6。
  15. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为1，所述N为8；
    所述天线端口字段的取值为第四值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-7。
  16. 根据权利要求12-15中任一项所述的方法或装置，其特征在于，所述第一天线端口组和所述第二天线端口组分别包括4个天线端口，所述第一天线端口组和所述第二天线端口组分别对应2个CDM组。
  17. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为2，所述N为5；
    所述天线端口字段的取值为第五值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,4,5,8，所述DMRS映射在两个符号上；和/或
    所述天线端口字段的取值为第六值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-4，所述DMRS映射在一个符号上。
  18. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为2，所述N为6；
    所述天线端口字段的取值为第七值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,4,5,8,9，所述DMRS映射在两个符号上；和/或
    所述天线端口字段的取值为第八值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,4,6，所述DMRS映射在一个符号上。
  19. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为2，所述N为7；
    所述天线端口字段的取值为第九值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,4,5,8,9,12，所述DMRS映射在两个符号上；和/或
    所述天线端口字段的取值为第十值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-6，所述DMRS映射在一个符号上。
  20. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为2，所述N为8；
    所述天线端口字段的取值为第十一值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,4,5,8,9,12,13，所述DMRS映射在两个符号上；和/或
    所述天线端口字段的取值为第十二值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0-7，所述DMRS映射在一个符号上。
  21. 根据权利要求17-20中任一项所述的方法或装置，其特征在于，所述第一天线端口组和所述第二天线端口组分别包括8个天线端口，所述第一天线端口组和所述第二天线端口组分别对应2个CDM组。
  22. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为2，所述maxLength为1，所述N为5；
    所述天线端口字段的取值为第十三值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-4；和/或
    所述天线端口字段的取值为第十四值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6。
  23. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为2，所述maxLength为1，所述N为6；
    所述天线端口字段的取值为第十五值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-5；和/或
    所述天线端口字段的取值为第十六值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端 口为0,1,2,3,6,8。
  24. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为2，所述maxLength为1，所述N为7；
    所述天线端口字段的取值为第十七值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-6；和/或
    所述天线端口字段的取值为第十八值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8。
  25. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为2，所述maxLength为1，所述N为8；
    所述天线端口字段的取值为第十九值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0,1,2,3,4,5,6,8；和/或
    所述天线端口字段的取值为第二十值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8,9。
  26. 根据权利要求22-25中任一项所述的方法或装置，其特征在于，所述第一天线端口组和所述第二天线端口组分别包括6个天线端口，所述第一天线端口组和所述第二天线端口组分别对应3个CDM组。
  27. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为2，所述maxLength为2，所述N为5；
    所述天线端口字段的取值为第二十一值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-4，所述DMRS映射在一个符号上；和/或
    所述天线端口字段的取值为第二十二值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6，所述DMRS映射在一个符号上；和/或
    所述天线端口字段的取值为第二十三值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,6,7,12，所述DMRS映射在两个符号上。
  28. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为2，所述maxLength为2，所述N为6；
    所述天线端口字段的取值为第二十四值，所述不映射数据的DMRS码分复用组的数量为3，所述天线端口为0-5，所述DMRS映射在一个符号上；和/或
    所述天线端口字段的取值为第二十五值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,8，所述DMRS映射在一个符号上；和/或
    所述天线端口字段的取值为第二十六值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,6,7,12,13，所述DMRS映射在两个符号上。
  29. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为2，所述maxLength为2，所述N为7；
    所述天线端口字段的取值为第二十七值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8，所述DMRS映射在一个符号上；和/或
    所述天线端口字段的取值为第二十八值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端口为0,1,6,7,12,13,18，所述DMRS映射在两个符号上。
  30. 根据权利要求10或11所述的方法或装置，其特征在于，所述dmrs-Type为2，所述maxLength为2，所述N为8；
    所述天线端口字段的取值为第二十九值，所述不映射数据的DMRS码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8，所述DMRS映射在一个符号上；和/或
    所述天线端口字段的取值为第三十值，所述不映射数据的DMRS码分复用组的数量为1，所述天线端 口为0,1,6,7,12,13,18,19，所述DMRS映射在两个符号上。
  31. 根据权利要求27-30中任一项所述的方法或装置，其特征在于，所述第一天线端口组和所述第二天线端口组分别包括12个天线端口，所述第一天线端口组和所述第二天线端口组分别对应3个CDM组。
  32. 根据权利要求10所述的方法或装置，其特征在于，所述dmrs-Type为1，所述maxLength为2，所述N为5，所述天线端口字段的取值为第三十一值，所述码分复用组的数量为2，所述天线端口为0-4，所述DMRS映射在两个符号上；和/或
    所述dmrs-Type为1，所述maxLength为2，所述N为6，所述天线端口字段的取值为第三十二值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,4,6，所述DMRS映射在两个符号上；和/或
    所述dmrs-Type为1，所述maxLength为2，所述N为7，所述天线端口字段的取值为第三十三值，所述码分复用组的数量为2，所述天线端口为0-6，所述DMRS映射在两个符号上；和/或
    所述dmrs-Type为1，所述maxLength为2，所述N为8，所述天线端口字段的取值为第三十四值，所述码分复用组的数量为2，所述天线端口为0-7，所述DMRS映射在两个符号上；和/或
    所述dmrs-Type为2，所述maxLength为2，所述N为5，所述天线端口字段的取值为第三十五值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,6，所述DMRS映射在两个符号上；和/或
    所述dmrs-Type为2，所述maxLength为2，所述N为6，所述天线端口字段的取值为第三十六值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,6,8，所述DMRS映射在两个符号上；和/或
    所述dmrs-Type为2，所述maxLength为2，所述N为7，所述天线端口字段的取值为第三十七值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8，所述DMRS映射在两个符号上；和/或
    所述dmrs-Type为2，所述maxLength为2，所述N为8，所述天线端口字段的取值为第三十八值，所述码分复用组的数量为2，所述天线端口为0,1,2,3,6,7,8,9，所述DMRS映射在两个符号上。
  33. 一种DMRS端口指示装置，其特征在于，包括：处理器，用于执行存储器中存储的程序，当所述程序被执行时，使得所述装置执行如权利要求1-4、9-32中任一项所述的方法。
  34. 一种计算机可读存储介质，其上存储有计算机程序，其特征在于，所述计算机程序被处理器执行时实现如权利要求1-4、9-32中任一项所述的方法。
PCT/CN2023/108632 2022-08-12 2023-07-21 Dmrs端口指示方法、装置及存储介质 WO2024032351A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210972325.0A CN117675136A (zh) 2022-08-12 2022-08-12 Dmrs端口指示方法、装置及存储介质
CN202210972325.0 2022-08-12

Publications (1)

Publication Number Publication Date
WO2024032351A1 true WO2024032351A1 (zh) 2024-02-15

Family

ID=89850776

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/108632 WO2024032351A1 (zh) 2022-08-12 2023-07-21 Dmrs端口指示方法、装置及存储介质

Country Status (2)

Country Link
CN (1) CN117675136A (zh)
WO (1) WO2024032351A1 (zh)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020143609A1 (zh) * 2019-01-11 2020-07-16 展讯半导体(南京)有限公司 端口配置方法及装置
CN111555850A (zh) * 2019-02-12 2020-08-18 中国移动通信有限公司研究院 一种dmrs的配置方法、装置和计算机可读存储介质
CN111786757A (zh) * 2019-04-04 2020-10-16 电信科学技术研究院有限公司 Dmrs端口的传输配置指示方法、相关装置及存储介质
CN114731258A (zh) * 2019-10-04 2022-07-08 瑞典爱立信有限公司 利用dci中的可配置的天线端口字段确定和指示天线端口的系统和方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020143609A1 (zh) * 2019-01-11 2020-07-16 展讯半导体(南京)有限公司 端口配置方法及装置
CN111555850A (zh) * 2019-02-12 2020-08-18 中国移动通信有限公司研究院 一种dmrs的配置方法、装置和计算机可读存储介质
CN111786757A (zh) * 2019-04-04 2020-10-16 电信科学技术研究院有限公司 Dmrs端口的传输配置指示方法、相关装置及存储介质
CN114731258A (zh) * 2019-10-04 2022-07-08 瑞典爱立信有限公司 利用dci中的可配置的天线端口字段确定和指示天线端口的系统和方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MODERATOR (VIVO): "Summary of PDSCH/PUSCH enhancements (Bandwidth/Timeline/Reference signals)", 3GPP TSG RAN WG1 MEETING #104BIS, R1-2103817, 12 April 2021 (2021-04-12), XP051995155 *

Also Published As

Publication number Publication date
CN117675136A (zh) 2024-03-08

Similar Documents

Publication Publication Date Title
JP7059393B2 (ja) ダウンリンク制御情報伝送方法
US11363499B2 (en) Resource configuration method, apparatus, and system
WO2019029662A1 (zh) 信息传输的方法和通信装置
WO2020143829A1 (zh) 发送和接收指示的方法和装置
US11916628B2 (en) Method and apparatus for providing antenna port indication to user equipment
CN111357361A (zh) 信息传输的方法和通信设备
WO2021018209A1 (zh) 一种dmrs端口指示方法及装置
WO2020024891A1 (zh) 参考信号的处理方法和装置
CN114828252A (zh) 多传输点数据传输的方法及装置
WO2022068936A1 (zh) 参考信号的映射方法及装置
WO2021062815A1 (zh) 调制解调参考信号的配置信息获取方法、配置方法及装置
WO2024032351A1 (zh) Dmrs端口指示方法、装置及存储介质
WO2022205022A1 (zh) 用于传输参考信号的方法和装置
WO2018127158A1 (zh) 一种数据传输的方法、网络侧设备及终端设备
WO2023060449A1 (zh) 无线通信的方法、终端设备和网络设备
CN116113053A (zh) 一种通信方法及装置
WO2023207650A1 (zh) 一种通信方法及装置
WO2024032394A1 (zh) 一种通信方法和装置
WO2018201830A1 (zh) 资源配置方法、装置、存储介质及处理器
WO2024032261A1 (zh) 序列生成方法及通信装置
WO2024067807A1 (zh) 通信方法、装置及存储介质
WO2023011108A1 (zh) 一种通信方法及通信装置
WO2024032200A1 (zh) 一种参考信号端口指示的方法及装置
WO2024021862A1 (zh) 通信方法、装置及存储介质
WO2024067190A1 (zh) 一种参考信号端口指示方法及装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23851573

Country of ref document: EP

Kind code of ref document: A1