Communication method and apparatus

Abstract

The application provides a communication method and device. The method comprises: a terminal device acquires at least one time domain resource allocation information and at least one DMRS configuration information, and the at least one time domain resource allocation information and the at least one DMRS configuration information correspond to each other; a network device sends DCI signaling to the terminal device, wherein the DCI signaling comprises a first index, and the first index is used to indicate first time domain resource allocation information, and the first time domain resource allocation information is one of the at least one time domain resource allocation information; and the terminal device determines first DMRS configuration information from the at least one DMRS configuration information according to the DCI signaling, and the first DMRS configuration information corresponds to the first time domain resource allocation information. According to the embodiment of the application, the flexible switching of the DCI-level DMRS configuration information can be realized, and then the flexible switching of the R15 port and the R18 port and / or the flexible switching of the FD-OCC length can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication, in particular to a communication method and device. BACKGROUND

[0002] In the R15 version of the 3rd generation partnership project (3GPP), two kinds of dedicated demodulation reference signal (DMRS) resource mapping types are defined, which are type 1 and type 2 respectively. Among them, the upper limit of the number of DMRS ports corresponding to type 1 is 8, and the upper limit of the number of DMRS ports corresponding to type 2 is 12.

[0003] With the continuous development of communication technology, 12 DMRS ports cannot meet the communication requirements more and more. Therefore, in the R18 version of the 3GPP, the number of DMRS ports is expanded (or said to be expanded). As a way, type 1 can be enhanced, and the upper limit of the number of DMRS ports corresponding to type 1 after enhancement can be 16. As another way, type 2 can be enhanced, and the upper limit of the number of DMRS ports corresponding to type 2 after enhancement can be 24.

[0004] Therefore, in R18, the R18 terminal device can use R15 ports or R18 ports. In addition, the frequency domain mask length of the R15 port is 2, and the frequency domain mask length of the R18 port is 4. Therefore, for the R18 terminal device, how to flexibly switch between the R15 port and the R18 port, and flexibly switch between the 2-long frequency domain mask and the 4-long frequency domain mask is a problem to be solved. SUMMARY

[0005] The present application provides a communication method and device.

[0006] In a first aspect, a communication method is provided, comprising:

[0007] The terminal device acquires at least one time domain resource allocation information and at least one demodulation reference signal (DMRS) configuration information, the at least one time domain resource allocation information and the at least one DMRS configuration information corresponding to each other; the terminal device receives downlink control information (DCI) signaling from the network device, the DCI signaling including a first index, the first index being used to indicate first time domain resource allocation information, the first time domain resource allocation information being one of the at least one time domain resource allocation information; and the terminal device determines first DMRS configuration information from the at least one DMRS configuration information according to the DCI signaling, the first DMRS configuration information corresponding to the first time domain resource allocation information.

[0008] According to the embodiments of the present application, the terminal device can determine the DMRS configuration information according to the DCI signaling sent by the network device, thereby realizing flexible scheduling of the DMRS configuration information at the DCI level. On this basis, flexible switching of R15 DMRS ports and R18 DMRS ports and / or flexible switching of the FD-OCC length can be realized.

[0009] It should be understood that the terminal device in the present application can be an R18 terminal device.

[0010] With reference to the first aspect, in some implementations of the first aspect, the terminal device acquires the at least one time domain resource allocation information and the at least one DMRS configuration information, including:

[0011] The terminal device receives radio resource control (RRC) signaling from the network device, the RRC signaling including a time domain resource allocation (TDRA) field, the TDRA field being used to configure the at least one time domain resource allocation information and the at least one DMRS configuration information.

[0012] In the embodiments of the present application, the terminal device can acquire the at least one DMRS configuration information through the RRC signaling. In addition, the terminal device can also acquire the at least one DMRS configuration information by predefining the at least one DMRS configuration information in the protocol.

[0013] It should be understood that, compared with being predefined in the protocol, acquiring through the RRC signaling can more flexibly modify the DMRS configuration information.

[0014] With reference to the first aspect, in some implementations of the first aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first type and a second type, and the DCI signaling further includes antenna port indication information; the method further includes:

[0015] The terminal device determines an antenna port index group set according to the DMRS type information and the first DMRS configuration information; the terminal device determines a first antenna port index group from the antenna port index group set according to the antenna port indication information.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the multiple antenna port candidate combinations satisfy any one of the following:

[0017] When the DMRS type information indicates the first type and the first DMRS configuration information indicates the first value, it corresponds to the first DMRS type; when the DMRS type information indicates the second type and the first DMRS configuration information indicates the first value, it corresponds to the second DMRS type; when the DMRS type information indicates the first type and the first DMRS configuration information indicates the second value, it corresponds to the third DMRS type; when the DMRS type information indicates the second type and the first DMRS configuration information indicates the second value, it corresponds to the fourth DMRS type.

[0018] The third DMRS type is an enhancement of the first DMRS type, and the fourth DMRS type is an enhancement of the second DMRS type.

[0019] In an embodiment of the present application, the antenna port table (or DMRS port table) includes multiple antenna port candidate combinations. For the first to fourth DMRS types mentioned above, the antenna port table corresponding to each DMRS type may be different. The terminal device can switch the DMRS type according to the DMRS configuration information indicated by the DCI signaling, thereby switching between the R15 port and the R18 port, and switching the frequency domain mask length.

[0020] In combination with the first aspect, in certain implementations of the first aspect, when the first DMRS configuration information indicates a first value, the ports in the antenna port index group set belong to a first DMRS port set; when the first DMRS configuration information indicates a second value, the ports in the antenna port index group set belong to a second DMRS port set.

[0021] In the embodiment of the present application, the first DMRS port set may be understood as an R15 port set, and the second DMRS port set may be understood as an R18 port set.

[0022] In some implementations of the first aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and the DCI signaling further includes antenna port indication information; and the method further includes:

[0023] The terminal device determines, according to the DMRS type information, a set of antenna port index groups, determines, according to the antenna port indication information, a first antenna port index group from the set of antenna port index groups, and determines, according to the first DMRS configuration information, a frequency domain mask length corresponding to a port in the first antenna port index group.

[0024] In some implementations of the first aspect, when the DMRS type information indicates the first DMRS type or the second DMRS type, a port in the set of antenna port index groups belongs to a first DMRS port set, and when the DMRS type information indicates the third DMRS type or the fourth DMRS type, a port in the set of antenna port index groups belongs to a second DMRS port set.

[0025] In some implementations of the first aspect, the terminal device determines the frequency domain mask length of the port in the first antenna port index group by:

[0026] When the first DMRS configuration information indicates a first value, the terminal device determines that the frequency domain mask length corresponding to the port in the first antenna port index group is 2, and when the first DMRS configuration information indicates a second value, the terminal device determines that the frequency domain mask length corresponding to the port in the first antenna port index group is 4.

[0027] According to the embodiments of the present application, the terminal device can determine the frequency domain mask length corresponding to the port in the antenna port index group according to the DMRS configuration information indicated by the DCI signaling, thereby achieving flexible switching of the frequency domain mask length.

[0028] In some implementations of the first aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and the DCI signaling further includes antenna port indication information; and the method further includes:

[0029] The terminal device determines a set of antenna port index groups according to the DMRS type information and the first DMRS configuration information; and the terminal device determines a first antenna port index group from the set of antenna port index groups according to the antenna port indication information.

[0030] According to the embodiments of the present application, the terminal device can determine which antenna port table to use according to the DMRS type information and the DMRS configuration information, thereby realizing flexible switching of the antenna port table.

[0031] With reference to the first aspect, in some implementations of the first aspect, the set of antenna port index groups satisfies any one of the following:

[0032] When the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates a first value, the set of antenna port index groups is a first set of antenna port index groups; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates a second value, the set of antenna port index groups is a second set of antenna port index groups; when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates a second value; or when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates a first value, the set of antenna port index groups is a third set of antenna port index groups.

[0033] With reference to the first aspect, in some implementations of the first aspect, the set of antenna port index groups satisfies any one of the following:

[0034] When the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates a first value, the ports in the set of antenna port index groups belong to a subset of a second DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates a second value, the ports in the set of antenna port index groups belong to the second DMRS port set; when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates a second value, the ports in the set of antenna port index groups belong to a first DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates a first value, the ports in the set of antenna port index groups belong to the first DMRS port set.

[0035] With reference to the first aspect, in some implementations of the first aspect, the antenna port index group set satisfies any one of the following:

[0036] when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates a first value, ports in the antenna port index group set belong to a first DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates a second value, ports in the antenna port index group set belong to a subset of a second DMRS port set; when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, ports in the antenna port index group set belong to the second DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the first value, ports in the antenna port index group set belong to the second DMRS port set.

[0037] With reference to the first aspect, in some implementations of the first aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and the DCI signaling further includes antenna port indication information; the method further includes:

[0038] the terminal device determines an antenna port index group set according to the DMRS type information; the terminal device determines a first antenna port index group from the antenna port index group set according to the antenna port indication information; and the terminal device determines a frequency domain mask length corresponding to a port in the first antenna port index group according to the DMRS type information and the first DMRS configuration information.

[0039] With reference to the first aspect, in some implementations of the first aspect, the antenna port index group set includes a second antenna port index group and a third antenna port index group, and a frequency domain mask length of a first port in the second antenna port index group is different from a frequency domain mask length of the first port in the third antenna port index group.

[0040] In some implementations of the first aspect, the set of antenna port index groups includes a second port and a third port, the second port and the third port are in a same CDM group, the second port is a port in a first set of DMRS ports, and the third port is a port in a second set of DMRS ports.

[0041] In some implementations of the first aspect, the set of antenna port index groups includes a fourth antenna port index group, the fourth antenna port index group includes a fourth port and a fifth port, and a length of a frequency domain mask corresponding to the fourth port is different from a length of a frequency domain mask corresponding to the fifth port.

[0042] In some implementations of the first aspect, the terminal device determines the length of the frequency domain mask corresponding to the ports in the first antenna port combination by:

[0043] When the DMRS type information indicates the first DMRS type or the second DMRS type and the first DMRS configuration information indicates a first value, the terminal device determines that the length of the frequency domain mask corresponding to the ports in the first antenna port index group is 2; when the DMRS type information indicates the third DMRS type or the fourth DMRS type and the first DMRS configuration information indicates a second value, the terminal device determines that the length of the frequency domain mask corresponding to the ports in the first antenna port index group is 4; when the DMRS type information indicates the third DMRS type or the fourth DMRS type and the first DMRS configuration information indicates the first value, the terminal device determines that the length of the frequency domain mask corresponding to the ports in the first antenna port index group is 2; and when the DMRS type information indicates the first DMRS type or the second DMRS type and the first DMRS configuration information indicates the second value, the terminal device determines that the first antenna port index group includes a port with a length of 2 and a port with a length of 4.

[0044] According to the embodiments of the present application, the terminal device can flexibly switch the length of the frequency domain mask according to the DMRS configuration information indicated by the DCI signaling.

[0045] In some implementations of the first aspect, a plurality of antenna port index groups included in the set of antenna port index groups correspond to a plurality of indexes, and the antenna port indication information is used to indicate one index in the plurality of indexes.

[0046] With reference to the first aspect, in some implementations of the first aspect, a frequency domain mask length corresponding to a port pair in the first DMRS port set is 2, and a frequency domain mask length corresponding to a port pair in the second DMRS port set is 4.

[0047] A second aspect provides a communication method, including:

[0048] A network device sends, to a terminal device, radio resource control (RRC) signaling including a time domain resource allocation (TDRA) field, the TDRA field being used to configure at least one time domain resource allocation information and at least one demodulation reference signal (DMRS) configuration information, the at least one time domain resource allocation information and the at least one DMRS configuration information corresponding to each other; and the network device sends, to the terminal device, downlink control information (DCI) signaling including a first index, the first index being used to indicate a first time domain resource allocation information, the first time domain resource allocation information being one of the at least one time domain resource allocation information.

[0049] According to embodiments of the present application, the network device can send, to the terminal device, DCI signaling used to indicate DMRS configuration information, so as to implement flexible scheduling of DCI-level DMRS configuration information. On this basis, flexible switching of R15 DMRS ports and R18 DMRS ports, and / or flexible switching of FD-OCC length can be implemented.

[0050] With reference to the second aspect, in some implementations of the second aspect, the first time domain resource allocation information corresponds to a first DMRS configuration information; the first DMRS configuration information indicates a first value, the first value corresponding to any one of the following: a frequency domain mask length of a DMRS port is 2, and a protocol version is r15; or the first DMRS configuration information indicates a second value, the second value corresponding to any one of the following: a frequency domain mask length of a DMRS port is 4, and a protocol version is r18.

[0051] With reference to the second aspect, in some implementations of the second aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first type and a second type, and the DCI signaling further includes antenna port indication information.

[0052] With reference to the second aspect, in some implementations of the second aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and the DCI signaling further includes antenna port indication information.

[0053] In a third aspect, a communication apparatus is provided, which can be a terminal device, or a device (e.g., a chip, or a chip system, or a circuit) in a terminal device, or a device capable of being used in matching with a terminal device.

[0054] In a possible implementation, the communication apparatus can include a module or unit corresponding to each of the methods / operations / steps / actions described in the first aspect, which can be a hardware circuit, or software, or a combination of hardware circuit and software.

[0055] In a possible implementation, the communication apparatus includes a transceiver and a processing unit connected to the transceiver.

[0056] The transceiver is configured to obtain at least one time domain resource allocation information and at least one demodulation reference signal (DMRS) configuration information, the at least one time domain resource allocation information corresponding to the at least one DMRS configuration information; and receive downlink control information (DCI) signaling from the network device, the DCI signaling including a first index, the first index being used to indicate a first time domain resource allocation information, the first time domain resource allocation information being one of the at least one time domain resource allocation information; and the processing unit is configured to determine, according to the DCI signaling, a first DMRS configuration information from the at least one DMRS configuration information, the first DMRS configuration information corresponding to the first time domain resource allocation information.

[0057] With reference to the third aspect, in some implementations of the third aspect, the transceiver is configured to receive radio resource control (RRC) signaling from the network device, the RRC signaling including a time domain resource allocation (TDRA) field, the TDRA field being used to configure the at least one time domain resource allocation information and the at least one DMRS configuration information.

[0058] With reference to the third aspect, in some implementations of the third aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first type and a second type, and the DCI signaling further includes antenna port indication information; the processing unit is configured to determine, according to the DMRS type information and the first DMRS configuration information, a set of antenna port index groups; and the processing unit is configured to determine, according to the antenna port indication information, a first antenna port index group from the set of antenna port index groups.

[0059] In some implementations of the third aspect, when the DMRS type information indicates the first type and the first DMRS configuration information indicates a first value, a corresponding first DMRS type; when the DMRS type information indicates the second type and the first DMRS configuration information indicates the first value, a corresponding second DMRS type; when the DMRS type information indicates the first type and the first DMRS configuration information indicates a second value, a corresponding third DMRS type; and when the DMRS type information indicates the second type and the first DMRS configuration information indicates the second value, a corresponding fourth DMRS type.

[0060] The third DMRS type is an enhancement of the first DMRS type, and the fourth DMRS type is an enhancement of the second DMRS type.

[0061] In some implementations of the third aspect, when the first DMRS configuration information indicates the first value, ports in the antenna port index group set belong to a first DMRS port set; and when the first DMRS configuration information indicates the second value, ports in the antenna port index group set belong to a second DMRS port set.

[0062] In some implementations of the third aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and the DCI signaling further includes antenna port indication information; a processing unit configured to determine an antenna port index group set according to the DMRS type information; a processing unit configured to determine a first antenna port index group from the antenna port index group set according to the antenna port indication information; and a processing unit configured to determine a frequency domain mask length corresponding to ports in the first antenna port index group according to the first DMRS configuration information.

[0063] In some implementations of the third aspect, when the DMRS type information indicates the first DMRS type or the second DMRS type, ports in the antenna port index group set belong to a first DMRS port set; and when the DMRS type information indicates the third DMRS type or the fourth DMRS type, ports in the antenna port index group set belong to a second DMRS port set.

[0064] In some implementations of the third aspect, in conjunction with the third aspect, when the first DMRS configuration information indicates a first value, the processing unit is configured to determine that a frequency domain mask length corresponding to a port in the first antenna port index group is 2; and when the first DMRS configuration information indicates a second value, the processing unit is configured to determine that the frequency domain mask length corresponding to the port in the first antenna port index group is 4.

[0065] In some implementations of the third aspect, in conjunction with the third aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and the DCI signaling further includes antenna port indication information; the processing unit is configured to determine a set of antenna port index groups according to the DMRS type information and the first DMRS configuration information; and the processing unit is configured to determine a first antenna port index group from the set of antenna port index groups according to the antenna port indication information.

[0066] In some implementations of the third aspect, in conjunction with the third aspect, the set of antenna port index groups satisfies any one of the following:

[0067] when the DMRS type information indicates the first DMRS type or the second DMRS type and the first DMRS configuration information indicates a first value, the set of antenna port index groups is a first set of antenna port index groups; when the DMRS type information indicates the third DMRS type or the fourth DMRS type and the first DMRS configuration information indicates a second value, the set of antenna port index groups is a second set of antenna port index groups; when the DMRS type information indicates the first DMRS type or the second DMRS type and the first DMRS configuration information indicates a second value; or when the DMRS type information indicates the third DMRS type or the fourth DMRS type and the first DMRS configuration information indicates a first value, the set of antenna port index groups is a third set of antenna port index groups.

[0068] In some implementations of the third aspect, in conjunction with the third aspect, the set of antenna port index groups satisfies any one of the following:

[0069] when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the first value, the ports in the antenna port index group set belong to a subset of the second DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the second value, the ports in the antenna port index group set belong to the second DMRS port set; when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, the ports in the antenna port index group set belong to the first DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the first value, the ports in the antenna port index group set belong to the first DMRS port set.

[0070] With reference to the third aspect, in some implementations of the third aspect, the plurality of antenna port candidate combinations satisfy any one of the following:

[0071] when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the first value, the ports in the antenna port index group set belong to a subset of the second DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the second value, the ports in the antenna port index group set belong to the second DMRS port set; when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, the ports in the antenna port index group set belong to the first DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the first value, the ports in the antenna port index group set belong to the second DMRS port set.

[0072] In some implementations of the third aspect, in the RRC signaling, DMRS type information is further included, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and in the DCI signaling, antenna port indication information is further included; the processing unit is configured to determine a set of antenna port index groups according to the DMRS type information; the processing unit is configured to determine a first antenna port index group from the set of antenna port index groups according to the antenna port indication information; and the processing unit is configured to determine a frequency domain mask length corresponding to a port in the first antenna port index group according to the DMRS type information and the first DMRS configuration information.

[0073] In some implementations of the third aspect, the set of antenna port index groups includes a second antenna port index group and a third antenna port index group, and a frequency domain mask length of a first port in the second antenna port index group is different from a frequency domain mask length of the first port in the third antenna port index group.

[0074] In some implementations of the third aspect, the set of antenna port index groups includes a second port and a third port, the second port and the third port being in a same CDM group, the second port being a port in a first DMRS port set, and the third port being a port in a second DMRS port set.

[0075] In some implementations of the third aspect, the set of antenna port index groups includes a fourth antenna port index group, the fourth antenna port index group including a fourth port and a fifth port, and a frequency domain mask length corresponding to the fourth port is different from a frequency domain mask length corresponding to the fifth port.

[0076] In some implementations of the third aspect, when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates a first value, the processing unit is configured to determine that a frequency domain mask length corresponding to a port in the first antenna port index group is 2; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates a second value, the processing unit is configured to determine that a frequency domain mask length corresponding to a port in the first antenna port index group is 4; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the first value, the processing unit is configured to determine that a frequency domain mask length corresponding to a port in the first antenna port index group is 2; and when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, the processing unit is configured to determine that the first antenna port index group includes a port with a frequency domain mask length of 2 and a port with a frequency domain mask length of 4.

[0077] In some implementations of the third aspect, a plurality of antenna port index groups included in the set of antenna port index groups correspond to a plurality of indexes, and the antenna port indication information is used to indicate one index in the plurality of indexes.

[0078] In some implementations of the third aspect, a frequency domain mask length corresponding to a port in the first DMRS port set is 2, and a frequency domain mask length corresponding to a port in the second DMRS port set is 4.

[0079] A fourth aspect provides a communication apparatus, which can be a network device, a device (for example, a chip or a chip system or a circuit) in a network device, or a device capable of being used in matching with a network device.

[0080] In a possible implementation, the communication apparatus can include a module or unit corresponding to each of the methods / operations / steps / actions described in the second aspect, which can be a hardware circuit, software, or a combination of hardware circuit and software.

[0081] In a possible implementation, the communication apparatus includes a transceiver and a processing unit connected to the transceiver.

[0082] The transceiver is configured to send, to a terminal device, radio resource control (RRC) signaling including a time domain resource allocation (TDRA) field, the TDRA field being used to configure at least one time domain resource allocation information and at least one demodulation reference signal (DMRS) configuration information, the at least one time domain resource allocation information corresponding to the at least one DMRS configuration information; and the transceiver is configured to send, to the terminal device, downlink control information (DCI) signaling including a first index, the first index being used to indicate a first time domain resource allocation information, the first time domain resource allocation information being one of the at least one time domain resource allocation information.

[0083] With reference to the fourth aspect, in some implementations of the fourth aspect, the first time domain resource allocation information corresponds to a first DMRS configuration information; the first DMRS configuration information indicates a first value, the first value corresponding to any one of: a frequency domain mask length of a DMRS port being 2, a protocol version being r15; or the first DMRS configuration information indicates a second value, the second value corresponding to any one of: a frequency domain mask length of a DMRS port being 4, a protocol version being r18.

[0084] With reference to the fourth aspect, in some implementations of the fourth aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first type and a second type, and the DCI signaling further includes antenna port indication information.

[0085] With reference to the fourth aspect, in some implementations of the fourth aspect, the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type and a fourth DMRS type, and the DCI signaling further includes antenna port indication information.

[0086] In a fifth aspect, a communication apparatus is provided, which comprises a communication interface and a processor, the communication interface being configured to output and / or input signals, and the processor being configured to execute computer programs or instructions stored in a memory, so that the communication apparatus performs the method in any possible implementation manner of the first aspect; or so that the communication apparatus performs the method in any possible implementation manner of the second aspect.

[0087] Optionally, the memory can be included in the communication apparatus, as one way, the memory can be arranged separately from the processor; as another way, the memory can be located in the processor and integrated with the processor.

[0088] Optionally, the memory can also be outside the communication apparatus and coupled with the processor.

[0089] In a sixth aspect, a computer readable storage medium is provided, including a computer program, which when executed on a computer, causes the computer to perform the method in any possible implementation of the first aspect, or causes the computer to perform the method in any possible implementation of the second aspect.

[0090] In a seventh aspect, a chip or chip system is provided, including a processing circuitry and an input output interface, the processing circuitry configured to perform the method in any possible implementation of the first aspect; or the processing circuitry configured to perform the method in any possible implementation of the second aspect.

[0091] In an eighth aspect, a computer program product is provided, including: a computer program (which can also be referred to as code, or instructions), which when executed by a computer, causes the computer to perform the method in any possible implementation of the first aspect; or causes the computer to perform the method in any possible implementation of the second aspect.

[0092] In a ninth aspect, a communication system is provided, including a terminal device and a network device. The terminal device is configured to perform the method in any possible implementation of the first aspect. The network device is configured to perform the method in any possible implementation of the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0093] Figure 1 A communication system to which the present application is applicable is shown.

[0094] Figure 2 An example schematic interaction diagram for the method proposed by the present application.

[0095] Figure 3 An example schematic interaction diagram for the method proposed by the present application.

[0096] Figure 4 An example schematic interaction diagram for the method proposed by the present application.

[0097] Figure 5 An example schematic interaction diagram for the method proposed by the present application.

[0098] Figure 6 An example schematic interaction diagram for the method proposed by the present application.

[0099] Figure 7 An example schematic block diagram of a communication apparatus provided by the present application.

[0100] Figure 8 An example schematic block diagram of a communication apparatus provided by the present application. DETAILED DESCRIPTION

[0101] For ease of understanding, some technical contents involved in the present application are first explained.

[0102] (1) Terminal device

[0103] The terminal device can be various devices providing voice and / or data connectivity to users, also known as terminals, user equipment (UE), mobile stations, mobile terminals, etc. The terminal can be widely applied in various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), internet of things (IOT), virtual reality, augmented reality, industrial control, automatic driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, an aerospace device, etc. In the embodiments of the present application, the chip applied in the above devices can also be referred to as a terminal.

[0104] (2) Network device

[0105] The network device in the embodiments of the present application can be an access network device such as a base station. The base station can be a base transceiver station (BTS) in a global system of mobile communication (GSM) system or a code division multiple access (CDMA) system, a base station in a wideband code division multiple access (WCDMA) system, an evolutional nodeB (eNB or eNodeB) in a long term evolution (LTE) system, a next generation NodeB (gNB) in a 5th generation (5G) mobile communication system, a base station in a future mobile communication system, or the like. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device. For example, the network device can also be a module or unit that completes part of the functions of a base station, for example, a central unit (CU) or a distributed unit (DU). The CU and the DU complete part of the protocol stack functions of the base station, respectively. In addition, the functions of the CU can be implemented by multiple entities, for example, the functions of the control plane (CP) and the user plane (UP) of the CU are separated to form a CU control plane (CU-CP) and a CU user plane (CU-UP). For example, the CU-CP and the CU-UP can be implemented by different functional entities and are connected through an E1 interface. The CU-CP and the CU-UP can be coupled with the DU.

[0106] (3) Dedicated demodulation reference signal (DMRS)

[0107] The DMRS is used to estimate the equivalent channel matrix of a data channel or a control channel, thereby being used for detection and demodulation of data. Exemplarily, the data channel can be a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH). Exemplarily, the control channel can be a physical downlink control channel (PDCCH).

[0108] For example, for a data channel PDSCH, the DMRS is usually precoded the same way as the transmitted data signal, so that the DMRS and the data experience the same equivalent channel.

[0109] In order to reduce the mutual interference between the DMRS resources corresponding to multiple DMRS ports, resource mapping can be performed in a manner of frequency division multiplexing, time division multiplexing, or code division multiplexing. In R15, two types of DMRS resource mapping are supported (denoted as type 1 and type 2, respectively). For type 1 DMRS, a maximum of 8 orthogonal DMRS ports can be supported; for type 2 DMRS, a maximum of 12 orthogonal DMRS ports can be supported.

[0110] Generally, one DMRS port corresponds to one transmission stream. For example, for multiple-input-multiple-output (MIMO) transmission with a number of transmission streams R, the number of DMRS ports is R.

[0111] (4) Code division multiplexing (CDM) group

[0112] The network device can divide the DMRS ports into multiple CDM groups. The DMRS ports in the same CDM group occupy the same time-frequency resources.

[0113] Take type 1 DMRS as an example: for single-symbol DMRS, in R15, maximum 4 DMRS ports are supported, and the DMRS resource occupies one OFDM symbol. The 4 DMRS ports are divided into 2 code division multiplexing groups (CDM groups), wherein CDM group 0 contains port 0 and port 1; CDM group 1 contains port 2 and port 3. CDM group 0 and CDM group 1 are frequency division multiplexed. The DMRS ports contained in the CDM group are mapped on the same time-frequency resource. The DMRS corresponding to the DMRS ports contained in the CDM group are distinguished by orthogonal cover code (OCC), so as to ensure the orthogonality of the DMRS ports in the CDM group. Specifically, port 0 and port 1 are located in the same resource element (RE), and are mapped in the frequency domain in the form of a comb, that is, port 0 and port 1 occupy adjacent frequency domain resources with an interval of one subcarrier. For one DMRS port, the adjacent 2 REs occupied correspond to an OCC code word sequence with a length of 2. For example, for subcarrier 0 and subcarrier 2, port 0 and port 1 adopt a set of OCC code word sequences with a length of 2 (+1+1 and +1-1). Similarly, port 2 and port 3 are located in the same resource element (RE), and are mapped in the frequency domain in the form of a comb on the REs not occupied by port 0 and port 1. For subcarrier 1 and subcarrier 3, port 2 and port 3 adopt a set of OCC code word sequences with a length of 2 (+1+1 and +1-1).

[0114] (5) OCC

[0115] OCC can be divided into two categories: frequency domain OCC (denoted as FD-OCC) and time domain OCC (denoted as TD-OCC).

[0116] Correspondingly, the length of OCC can also be divided into two categories, that is, the length of FD-OCC and the length of TD-OCC.

[0117] (6) DMRS port number expansion

[0118] In R15, two types of DMRS resource mapping are defined, which are type 1 (type 1) and type 2 (type 2). Among them, the upper limit of the number of DMRS ports corresponding to type 1 is 8, and the upper limit of the number of DMRS ports corresponding to type 2 is 12. Maximum 12 orthogonal DMRS ports can be supported. In addition, in R15, the FD-OCC length of the DMRS port is 2.

[0119] In R18, as one way, type 1 can be enhanced, and the upper limit of the number of corresponding DMRS ports after type 1 enhancement is 16; as another way, type 2 can be enhanced, and the upper limit of the number of corresponding DMRS ports after type 2 enhancement is 24. In addition, in R18, the FD-OCC length of the DMRS port can be 4.

[0120] Exemplarily, type 1 after enhancement can be recorded as type 1-E, or type 1-R18, or type 3; type 2 after enhancement can be recorded as type 2-E, or type 2-R18, or type 4. It should be understood that the name after the enhancement of type 1 and the enhancement of type 2 in the present application is not limited.

[0121] That is, the complete set of configuration types corresponding to the high-layer signaling of the R18 DMRS port can be: type 1, type 2, type 1-E, type 2-E.

[0122] (7) First DMRS port set and second DMRS port set

[0123] In the present application, the first DMRS port set can be understood as the R15 port set. The second DMRS port set can be understood as the R18 port set. That is, the first DMRS port set can only include the ports defined in R15. The second DMRS port set can include the ports defined in R15, and can also include the newly added ports in R18.

[0124] The FD-OCC length corresponding to the ports in the first DMRS port set can be 2. The FD-OCC length corresponding to the ports in the second DMRS port set can be 4.

[0125] In addition, for the different resource mapping types described above, the upper limit values of the number of ports included in the first DMRS port set and the second DMRS port set can be different.

[0126] For example, for type 1 single symbol, the upper limit value of the number of ports included in the first DMRS port set can be 4; for type 1 double symbol, the upper limit value of the number of ports included in the first DMRS port set can be 8. For type 2 single symbol, the upper limit value of the number of ports included in the first DMRS port set can be 6; for type 2 double symbol, the upper limit value of the number of ports included in the first DMRS port set can be 12.

[0127] For example, for type 3 single symbol, the upper limit of the number of ports included in the second DMRS port set can be 8; for type 3 double symbol, the upper limit of the number of ports included in the second DMRS port set can be 16. For type 4 single symbol, the upper limit of the number of ports included in the second DMRS port set can be 12; for type 4 double symbol, the upper limit of the number of ports included in the second DMRS port set can be 24.

[0128] (8) Method for terminal device to obtain information of DMRS port allocated by network device

[0129] In the data transmission process, the network device informs the terminal device of the corresponding allocated DMRS port. The terminal device, based on the allocated DMRS port, performs pilot signal reception and corresponding channel estimation process at the corresponding resource location according to the protocol-defined DMRS symbol generation method and time-frequency resource mapping rule.

[0130] The DMRS port involved in the present application is mainly used for uplink and downlink data signal (PUSCH and PDSCH) transmission. For such DMRS reference signal configured for data transmission, the high layer signaling configuration is located in PDSCH configuration (PDSCH-config) or PUSCH configuration (PUSCH-config). The following takes PDSCH-config as an example to explain the method for network device to inform terminal device of the allocated DMRS port. Specifically, it can include the following 3 steps.

[0131] Step 1: The network device sends PDSCH-config signaling to the terminal device.

[0132] The existing standard defines a possible data structure of PDSCH-config signaling as follows (the contents not involved in the present application are replaced with “......”):

[0133] PDSCH-Config ::= SEQUENCE {

[0134] …

[0135] dmrs-DownlinkForPDSCH-MappingTypeA SetupRelease { DMRS-DownlinkConfig} OPTIONAL,

[0136] dmrs-DownlinkForPDSCH-MappingTypeB SetupRelease { DMRS-DownlinkConfig} OPTIONAL,

[0137] …

[0138] pdsch-TimeDomainAllocationList SetupRelease{PDSCH-TimeDomainResourceAllocationList}OPTIONAL,

[0139] …

[0140] }

[0141] Among them, a possible data structure of the DMRS downlink configuration (DMRS-DownlinkConfig) field included in the PDSCH-config signaling is as follows:

[0142] DMRS-DownlinkConfig-r18::=SEQUENCE{

[0143] dmrs-Type ENUMERATED{type2} OPTIONAL,

[0144] …

[0145] maxLength ENUMERATED{len2}OPTIONAL,

[0146] …

[0147] }

[0148] It should be understood that the DMRS type (dmrs-Type) is used to indicate one of type 1 and type 2. The maximum length (maxLength) is used to indicate one of a single symbol and a double symbol.

[0149] Among them, a possible data structure of the PDSCH time domain resource allocation list (PDSCH-TimeDomainResourceAllocationList) field in the PDSCH-config signaling is as follows:

[0150] PDSCH-TimeDomainResourceAllocationList::=SEQUENCE(SIZE(1..maxNrofDL-Allocations))OF PDSCH-TimeD0mainResourceAllocation

[0151] PDSCH-TimeDomainResourceAllocation::=SEQUENCE{

[0152] k0 INTEGER(0..32) OPTIONAL,

[0153] mappingType ENUMERATED{typeA,typeB},

[0154] startSymbolAndLength INTEGER(0..127)

[0155] }

[0156] It should be understood that k0 is used to indicate the starting slot offset, mappingType is used to indicate the mapping type, and startSymbolAndLength is used to indicate the starting symbol and length.

[0157] Exemplarily, the content indicated by the time domain resource allocation (TDRA) list field can be seen from Table 1:

[0158] Table 1

[0159] Index [K0] Mapping type SLIV 1 1 Type A 66 2 1 Type A 27 3 2 Type B 101 … … … …

[0160] Taking Row index with a value of 1 as an example, k0 with a value of 1 indicates that there is a 1-slot interval between the PDSCH and the scheduling PDCCH, the value of MappingType corresponds to the PDSCH configuration type TypeA, and the value of start and length indicator (SLIV) corresponds to the starting transmission symbol and the number of consecutive symbols of the PDSCH in the transmission slot.

[0161] In addition, when the pdsch-TimeDomainAllocationList field is not included in the PDSCH-config signaling, a plurality of time domain resource allocation information can be pre-configured in the terminal device. Exemplarily, the plurality of time domain resource allocation information pre-configured in the terminal device can be as shown in Table 2.

[0162] Table 2

[0163] Index Mapping type [K2] S L 1 Type A j 0 14 2 Type A j 0 12 … … … … …

[0164] Step 2:

[0165] The network device sends DCI signaling to the terminal device. The DCI signaling includes an antenna port (Antenna port) field and a TDRA field. The Antenna port field includes an index indicating the DMRS port allocated by the network device. The TDRA field includes an index indicating a time domain resource allocation information, for example, the index is a certain index in Table 1 or a certain index in Table 2.

[0166] Step 3:

[0167] The terminal device determines the DMRS port allocated by the network device according to the received PDSCH-config signaling and DCI signaling.

[0168] It should be understood that different DMRS port tables can be defined for different values of dmrs-Type and maxLength. The terminal device can determine the DMRS port allocated by the network device from the corresponding DMRS port table according to the DCI signaling.

[0169] For example, for type1 single symbol, the corresponding DMRS port table can be as shown in Table 3 below, and the index included in the Antenna port field in the DCI signaling can be a certain index in Table 3.

[0170] Table 3

[0171]

[0172] (9) Antenna port index group and antenna port index group set

[0173] For example, in Table 3, each row of the "DMRS port" can be referred to as an "antenna port index group", and all "antenna port index groups" in Table 3 can be referred to as an "antenna port index group set". In the embodiments of the present application, an "antenna port index group set" corresponds to a "DMRS port table". In other words, an "antenna port index group set" corresponds to a "antenna port table".

[0174] The technical problems addressed by the present application are described below.

[0175] As described above, in R18, the R18 terminal device can use R15 ports and R18 ports. Therefore, how to flexibly schedule the two kinds of DMRS ports is a problem to be solved. In addition, the FD-OCC length corresponding to the DMRS port in R15 is 2, and the FD-OCC length corresponding to the DMRS port in R18 can be 4, so how to flexibly schedule the FD-OCC length of the DMRS port is also a problem to be solved.

[0176] In view of the above technical problems, the present application provides a method 200, which specifically comprises: Figure 2

[0177] S201, the terminal device acquires at least one time domain resource allocation information and at least one DMRS configuration information.

[0178] The at least one time domain resource allocation information and the at least one DMRS configuration information correspond to each other. Exemplarily, the at least one time domain resource allocation information and the at least one DMRS configuration information have a one-to-one correspondence relationship or a many-to-one correspondence relationship, which is not limited in the present application.

[0179] The value of each DMRS configuration information in the at least one DMRS configuration information can be a first value or a second value.

[0180] The first value is used to indicate R15, or used to indicate that the upper limit value of the number of DMRS ports is 8, or used to indicate that the upper limit value of the number of DMRS ports is 12, or used to indicate that the DMRS type is not enhanced, or used to indicate that the frequency domain mask length corresponding to the DMRS port is 2.

[0181] The second value is used to indicate R18, or used to indicate that the upper limit value of the number of DMRS ports is 16, or used to indicate that the upper limit value of the number of DMRS ports is 24, or used to indicate that the DMRS type is enhanced, or used to indicate that the frequency domain mask length corresponding to the DMRS port is 4.

[0182] The following describes the manner in which the terminal device acquires the at least one time domain resource allocation information and the at least one DMRS configuration information:

[0183] Manner 1:

[0184] The network device sends radio resource control (RRC) signaling to the terminal device. Correspondingly, the terminal device receives the RRC signaling.

[0185] Exemplarily, the RRC signaling in the present application can be PDSCH-config signaling or PUSCH-config signaling. Details are not described herein.

[0186] The RRC signaling includes a TDRA field (exemplarily, the TDRA field can correspond to the pdsch-TimeDomainAllocationList described above). The TDRA field is used to configure the at least one time domain resource allocation information and the at least one DMRS configuration information.

[0187] ​Each of the at least one time domain resource allocation information can include the mappingType parameter and the startSymbolAndLength parameter in the above description, and optionally, can further include the k0 parameter in the above description.

[0188] Optionally, as one way, an indication field can be added in the TDRA field, and the added indication field is used to configure the at least one DMRS configuration information.

[0189] Exemplarily, after adding the indication field in the TDRA field, the content indicated by the TDRA field can be as shown in Table 4.

[0190] Table 4

[0191] Index [K0] Mapping type SLIV DMRS configuration information 1 1 Type A 66 First value 2 1 Type A 27 Second value 3 2 Type B 101 First value … … … … …

[0192] Optionally, as another way, the at least one DMRS configuration information can be configured by one or more indication fields in the TDRA field. For example, the at least one DMRS configuration information can be implicitly configured by the k0 parameter, or the at least one DMRS configuration information can be implicitly configured by the k0 parameter and the SLIV parameter.

[0193] Optionally, the TDRA field included in the RRC signaling can be used to configure the at least one time domain resource allocation information, and other fields in the RRC signaling except the TDRA field can be used to configure the at least one DMRS configuration information. At this time, the at least one time domain resource allocation information and the at least one DMRS configuration information can have a corresponding relationship by default.

[0194] Way 2:

[0195] The at least one time domain resource allocation information and the at least one DMRS configuration information are pre-configured in the protocol. The terminal device can obtain the at least one time domain resource allocation information and the at least one DMRS configuration information according to the supported protocol.

[0196] Exemplarily, the at least one time domain resource allocation information and the at least one DMRS configuration information pre-configured in the protocol can be as shown in Table 5.

[0197] Table 5

[0198] Index mapping type [K2] S L DMRS configuration information 1 Type A j 0 14 First value 2 Type A j 0 12 Second value … … … … … …

[0199] S202, the network device sends the DCI signaling to the terminal device. Correspondingly, the terminal device receives the DCI signaling from the network device.

[0200] The DCI includes a first index, which is used to indicate the first time domain resource allocation information. The first time domain resource allocation information is one of the at least one time domain resource allocation information.

[0201] Exemplarily, the TDRA field in the DCI signaling can include the first index.

[0202] The DCI also includes antenna port indication information (corresponding to the Antenna port field in the foregoing), which is used to indicate the DMRS port allocated by the network device to the terminal device.

[0203] Specifically, the network device can determine the time domain resource allocated to the terminal device, and indicate the time domain resource to the terminal device through the TDRA field in the DCI signaling.

[0204] The network device can also determine the number and the number of DMRS ports allocated to the terminal device, and indicate the DMRS port allocated to the terminal device to the terminal device through the Antenna port field in the DCI signaling.

[0205] It should be understood that in the embodiments of the present application, the network device can also determine the DMRS configuration information corresponding to the data transmission process, and exemplarily indicate the DMRS configuration information to the terminal device through the TDRA field in the DCI signaling.

[0206] That is, in the embodiments of the present application, the index included in the TDRA field in the DCI signaling can be used to indicate not only the time domain resource allocation information, but also the DMRS configuration information.

[0207] For example, the network device determines that the DMRS configuration information corresponding to a certain data transmission process is the first DMRS configuration information, and then generates the DCI signaling #1, which includes a first index, and indicates the first DMRS configuration information through the first index. After that, the network device determines that the DMRS configuration information corresponding to the next data transmission process is the second DMRS configuration information, and then generates the DCI signaling #2, which includes a second index, and indicates the second DMRS configuration information through the second index.

[0208] That is, according to the embodiments of the present application, the scheduling of the DMRS configuration information at the DCI level can be realized.

[0209] S203, the terminal device determines the first DMRS configuration information from the at least one DMRS configuration information according to the DCI signaling, and the first DMRS configuration information corresponds to the first time domain resource allocation information.

[0210] Exemplarily, if the terminal device obtains the at least one DMRS configuration information by the manner 1 in S201, the terminal device can determine the first DMRS configuration information according to the first index in the DCI signaling. Taking Table 4 as an example, when the value of the first index is '1', the first DMRS configuration information corresponds to the first value.

[0211] Exemplarily, if the terminal device obtains the at least one DMRS configuration information by the manner 2 in S201, the terminal device can determine the first DMRS configuration information according to the first index in the DCI signaling. Taking Table 5 as an example, when the value of the first index is '2', the first DMRS configuration information corresponds to the second value.

[0212] According to the embodiment of the present application, the network device can indicate different DMRS configuration information to the terminal device through different DCI signaling, so as to realize the flexible scheduling of the DCI level DMRS configuration information. On this basis, the flexible scheduling of the R15 DMRS port and the R18 DMRS port, and / or the flexible scheduling of the FD-OCC length can be realized.

[0213] The method 200 will be described in detail in combination with the method 300. In the method 300, the DMRS type is jointly indicated by the DMRS type information and the DMRS configuration information, and the network device can send different DCI signaling to realize the switching of the R15 port and the R18 port. As shown in the method 300, the method 300 specifically includes: Figure 3

[0214] S301, the network device sends RRC signaling to the terminal device. Correspondingly, the terminal device receives the RRC signaling.

[0215] The RRC signaling includes the DMRS type information, and optionally, the RRC signaling can further include a TDRA field.

[0216] Exemplarily, the DMRS type information can correspond to the dmrs-Type in the DMRS-DownlinkConfig field in the above.

[0217] The DMRS type information indicates any one of the first type (corresponding to the type 1 in the above) and the second type (corresponding to the type 2 in the above).

[0218] The TDRA field is used to configure at least one time domain resource allocation information and at least one DMRS configuration information, and the at least one time domain resource allocation information and the at least one DMRS configuration information correspond to each other. The specific configuration manner can be referred to the manner 1 in S201.

[0219] ​Optionally, as another method, if the RRC signaling does not include the TDRA field, then the terminal device can obtain at least one time domain resource allocation information and at least one DMRS configuration information according to method 2 in S201.

[0220] S302: The network device sends DCI signaling to the terminal device. Correspondingly, the terminal device receives the DCI signaling from the network device.

[0221] The DCI includes a first index, where the first index is used to indicate first time domain resource allocation information. The first time domain resource allocation information is one of the at least one time domain resource allocation information. Exemplarily, the first index may be carried in a TDRA field in the DCI signaling.

[0222] The DCI also includes antenna port indication information (corresponding to the Antenna port field above), and the antenna port indication information is used to indicate the DMRS port allocated by the network device to the terminal device.

[0223] S303: The terminal device determines first DMRS configuration information from at least one DMRS configuration information according to the DCI signaling, where the first DMRS configuration information corresponds to the first time domain resource allocation information.

[0224] For details about this process, please refer to S203.

[0225] S304: The terminal device determines an antenna port index group set according to the DMRS type information and the first DMRS configuration information.

[0226] Specifically, the terminal device determines the antenna port table (or DMRS port table) according to the DMRS type information, the first DMRS configuration information and the "maxLength" parameter. The antenna port table includes the correspondence between multiple antenna port index groups and multiple indexes.

[0227] Case 1:

[0228] When the DMRS type information indicates the first type and the first DMRS configuration information indicates the first value, the antenna port table determined by the terminal device for the first DMRS type can refer to the existing protocol. The ports in the antenna port index group set belong to the first DMRS port set. The frequency domain mask length corresponding to the ports in the first DMRS port set is 2. The upper limit of the number of ports in the first DMRS port set is 8.

[0229] Case 2:

[0230] When the DMRS type information indicates the second type and the first DMRS configuration information indicates the first value, the terminal device determines the antenna port table corresponding to the second DMRS type as shown in Table D1 (corresponding to a single symbol) or Table D2 (corresponding to a double symbol) in the following method 600. The ports in the antenna port index group set belong to the first DMRS port set. The frequency domain mask length corresponding to the ports in the first DMRS port set is 2. The upper limit of the number of ports in the first DMRS port set is 12.

[0231] Case 3:

[0232] When the DMRS type information indicates the first type and the first DMRS configuration information indicates the second value, the terminal device determines the antenna port table corresponding to the third DMRS type (i.e., type1-E in the above) as shown in Table D1 (corresponding to a single symbol) or Table D2 (corresponding to a double symbol) in the following method 600. The ports in the antenna port index group set belong to the second DMRS port set. The frequency domain mask length corresponding to the ports in the second DMRS port set is 4.

[0233] Case 4:

[0234] When the DMRS type information indicates the second type and the first DMRS configuration information indicates the second value, the terminal device determines the antenna port table corresponding to the fourth DMRS type (i.e., type2-E in the above) as shown in Table D3 (corresponding to a single symbol), Table D4-1 (corresponding to a double symbol), or Table D4-2 (corresponding to a double symbol) in the following method 600. The ports in the antenna port index group set belong to the second DMRS port set. The frequency domain mask length corresponding to the ports in the second DMRS port set is 4.

[0235] In S305, the terminal device determines a first antenna port index group from the antenna port index group set according to the antenna port indication information.

[0236] As can be seen from S304, the plurality of antenna port index groups included in the antenna port index group set correspond to a plurality of indexes. The antenna port indication information is used to indicate one of the plurality of indexes. The terminal device can determine the first antenna port index group from the plurality of antenna port index groups according to the index.

[0237] Optionally, the terminal device can also determine the number of CDM groups (i.e., Number of DMRS CDM group(s) without data) on which no data is transmitted on the symbol where the DMRS is located.

[0238] According to the method 300 of the embodiments of the present application, the network device can respectively indicate different DMRS configuration information by sending a plurality of DCI signaling, thereby realizing the switching between R15 ports and R18 ports.

[0239] For example, when the network device determines that the total number of streams of multi-user multi-input multi-output (MU-MIMO) is less than or equal to the maximum number of streams (12 streams) supported by the R15 DMRS port, the network device sends DCI signaling to the terminal device, the terminal device determines the first DMRS configuration information according to the DIC signaling, and the first DMRS configuration information is a first value, thereby supporting the R18 terminal device to fall back to use the R15 port.

[0240] For another example, when the network device determines that the total number of streams of MU-MIMO is greater than the maximum number of streams (12 streams) supported by the R15 DMRS port, the network device sends DCI signaling to the terminal device, the terminal device determines the first DMRS configuration information according to the DIC signaling, and the first DMRS configuration information is a second value, thereby supporting the R18 terminal device to use the R18 port, improving the MU-MIMO spatial multiplexing capability, and improving the total spectral efficiency.

[0241] The method 200 will be described in detail in combination with the method 400. In the method 400, the DMRS type is indicated by the DMRS type information configured by the RRC signaling, and the network device can send different DCI signaling to realize switching between 2-long FD-OCC and 4-long FD-OCC. As shown in the method 400, the method 400 specifically includes: Figure 4

[0242] S401, the network device sends RRC signaling to the terminal device. Correspondingly, the terminal device receives the RRC signaling.

[0243] The RRC signaling includes DMRS type information, and optionally, a TDRA field.

[0244] The DMRS type information indicates any one of a first DMRS type (corresponding to type 1 in the foregoing), a second DMRS type (corresponding to type 2 in the foregoing), a third DMRS type (corresponding to type 1-E in the foregoing), and a fourth DMRS type (corresponding to type 2-E in the foregoing).

[0245] The TDRA field is used to configure at least one time domain resource allocation information and at least one DMRS configuration information, and the at least one time domain resource allocation information and the at least one DMRS configuration information correspond to each other. The specific configuration manner can refer to the manner 1 in S201.

[0246] Optionally, as another manner, the RRC signaling does not include the TDRA field, at this time, the terminal device can acquire the at least one time domain resource allocation information and the at least one DMRS configuration information according to the manner 2 in S201.

[0247] ​S402, the network device sends DCI signaling to the terminal device. Correspondingly, the terminal device receives the DCI signaling from the network device.

[0248] The first index is included in the DCI, and the first index is used to indicate the first time domain resource allocation information. The first time domain resource allocation information is one of the at least one time domain resource allocation information. Exemplarily, the first index can be carried in the TDRA field in the DCI signaling.

[0249] The DCI also includes antenna port indication information (corresponding to the Antenna port field in the foregoing), and the antenna port indication information is used to indicate the DMRS port allocated by the network device to the terminal device.

[0250] S403, the terminal device determines the first DMRS configuration information from the at least one DMRS configuration information according to the DCI signaling, and the first DMRS configuration information corresponds to the first time domain resource allocation information.

[0251] For the process, reference can be made to S203.

[0252] S4e4, the terminal device determines the antenna port index group set according to the DMRS type information.

[0253] Specifically, the terminal device determines an antenna port table (or referred to as a DMRS port table) according to the DMRS type information and the “maxLength” parameter, and the antenna port table includes a plurality of antenna port index groups and a corresponding relationship between a plurality of indexes.

[0254] The following is described in different cases.

[0255] Case 1:

[0256] When the DMRS type information indicates the first DMRS type, the antenna port table determined by the terminal device can refer to the existing protocol.

[0257] Case 2:

[0258] When the DMRS type information indicates the second DMRS type, the antenna port table determined by the terminal device can refer to the existing protocol.

[0259] Case 3:

[0260] When the DMRS type information indicates the third DMRS type, the antenna port table determined by the terminal device is shown in the table D1 (corresponding to a single symbol) or the table D2 (corresponding to a double symbol) in the following method 600.

[0261] Case 4:

[0262] When the DMRS type information indicates the fourth DMRS type, the terminal device determines the antenna port table as shown in Table D3 (corresponding to a single symbol), Table D4-1 (corresponding to a double symbol), or Table D4-2 (corresponding to a double symbol) in the following method 600.

[0263] S405, the terminal device determines a first antenna port index group from the set of antenna port index groups according to the antenna port indication information.

[0264] As can be seen from S404, the plurality of antenna port index groups included in the set of antenna port index groups correspond to a plurality of indexes. The antenna port indication information is used to indicate one of the plurality of indexes. The terminal device can determine the first antenna port index group from the plurality of antenna port index groups according to the index.

[0265] Optionally, the terminal device can also determine the number of CDM groups in which no data is transmitted on the symbol where the DMRS is located.

[0266] S406, the terminal device determines the frequency domain mask length corresponding to the ports in the first antenna port index group according to the first DMRS configuration information.

[0267] Case A:

[0268] When the first DMRS configuration information indicates the first value, the terminal device determines that the frequency domain mask length corresponding to the ports in the first antenna port index group is 2.

[0269] For example, if the first antenna port index group is determined from the table corresponding to case 3 or case 4 of S404, although the ports in the first antenna port index group belong to R18 ports and the FD-OCC length is 4, in this case A, the ports in the first antenna port index group can be backed off from the 4-long FD-OCC to the 2-long FD-OCC.

[0270] Case B:

[0271] When the first DMRS configuration information indicates the second value, the terminal device determines that the frequency domain mask length corresponding to the ports in the first antenna port index group is 4.

[0272] For example, if the first antenna port index group is determined from the table corresponding to case 1 or case 2 of S404, although the ports in the first antenna port index group belong to R15 ports and the FD-OCC length is 2, in this case B, the ports in the first antenna port index group can be expanded from the 2-long FD-OCC to the 4-long FD-OCC.

[0273] According to the method 400 of the embodiments of the present application, the network device can indicate different DMRS configuration information respectively by sending multiple DCI signals, so as to realize the switching between 2-long FD-OCC and 4-long FD-OCC.

[0274] The method 200 will be described in detail in combination with the method 500. In the method 500, the DMRS port table can be jointly indicated by the DMRS type information and the DMRS configuration information, and the network device can send different DCI signals to realize the switching between different DMRS port tables, thereby realizing the switching between R15 ports and R18 ports, and / or the switching between 2-long FD-OCC and 4-long FD-OCC. As shown in the method 500, the method 500 specifically includes the following steps. Figure 5

[0275] S501, the network device sends RRC signaling to the terminal device. Correspondingly, the terminal device receives the RRC signaling.

[0276] The process is the same as S401, and specific reference can be made to the description in S401.

[0277] S502, the network device sends DCI signaling to the terminal device. Correspondingly, the terminal device receives the DCI signaling from the network device.

[0278] The process is the same as S402, and specific reference can be made to the description in S402.

[0279] S503, the terminal device determines the first DMRS configuration information from the at least one DMRS configuration information according to the DCI signaling, and the first DMRS configuration information corresponds to the first time domain resource allocation information.

[0280] Reference can be made to S203 for the process.

[0281] S504, the terminal device determines the antenna port index group set according to the DMRS type information and the first DMRS configuration information.

[0282] Specifically, the terminal device determines the antenna port table (or referred to as the DMRS port table) according to the DMRS type information, the first DMRS configuration information and the “maxLength” parameter, and the antenna port table includes the corresponding relationship between the multiple antenna port index groups and the multiple indexes.

[0283] The S504 will be described in the following cases.

[0284] Case 1:

[0285] The DMRS type information indicates the first DMRS type (typel) or the third DMRS type (typel-E), and is single symbol. ​

[0286] This case 1 can be further divided into two implementation manners, which are described below.

[0287] The first implementation manner: the antenna port table determined by the terminal device can be one of the following table A1, table B1 and table C1.

[0288] It should be understood that in R15, one typel single symbol corresponds to 4 R15 ports. In R18, 8 R18 ports can be obtained by enhancing the typel single symbol. The first 4 ports of the 8 R18 ports are included in table A1, and the FD-OCC length corresponding to the ports is 4. The 8 R18 ports are included in table B1, and the FD-OCC length corresponding to the ports is 4. The 4 R15 ports are included in table C1.

[0289] Table A1 (both are R15): the DMRS type information indicates the first DMRS type, the first DMRS configuration information indicates the first value, and it is a single symbol. The antenna port index group set corresponding to table A1 can be recorded as the first antenna port index group set #1.

[0290]

[0291]

[0292] Table B1 (both are R18): the DMRS type information indicates the third DMRS type, the first DMRS configuration information indicates the second value, and it is a single symbol. The antenna port index group set corresponding to table B1 can be recorded as the second antenna port index group set #1.

[0293]

[0294] Table C1 (one R15, one R18): the DMRS type information indicates the first DMRS type, the first DMRS configuration information indicates the second value, and it is a single symbol. Alternatively, the DMRS type information indicates the third DMRS type, the first DMRS configuration information indicates the first value, and it is a single symbol. The antenna port index group set corresponding to table C1 can be recorded as the third antenna port index group set #1.

[0295]

[0296] The second implementation manner: the antenna port table determined by the terminal device can be one of the following table A2, table B2 and table C2.

[0297] It should be understood that in R15, one type1 single symbol corresponds to 4 R15 ports. In R18, the type1 single symbol is enhanced to obtain 8 R18 ports. The 4 R15 ports are included in Table A2, and the FD-OCC length corresponding to the ports is 2. The last 4 R18 ports (i.e., extended ports) of the 8 R18 ports are included in Table B2, and the FD-OCC length corresponding to the ports is 4. The 8 R18 ports are included in Table C2.

[0298] Table A2 (both are R15): the DMRS type information indicates the first DMRS type, the first DMRS configuration information indicates a first value, and it is a single symbol. The antenna port index group set corresponding to Table A2 can be recorded as a first antenna port index group set #2.

[0299]

[0300] Table B2 (both are R18): the DMRS type information indicates the third DMRS type, the first DMRS configuration information indicates a second value, and it is a single symbol. The antenna port index group set corresponding to Table B2 can be recorded as a second antenna port index group set #2.

[0301]

[0302]

[0303] Table C2 (one R15 and one R18): the DMRS type information indicates the first DMRS type, the first DMRS configuration information indicates a second value, and it is a single symbol. Alternatively, the DMRS type information indicates the third DMRS type, the first DMRS configuration information indicates a first value, and it is a single symbol. The antenna port index group set corresponding to Table C2 can be recorded as a third antenna port index group set #2.

[0304]

[0305] Case 2:

[0306] The DMRS type information indicates the first DMRS type (type1) or the third DMRS type (type1-E), and it is a double symbol.

[0307] The case 2 can be further divided into two implementation manners, and the two implementation manners are described below.

[0308] The first implementation manner: the antenna port table determined by the terminal device can be one of the following Table A3, Table B3 and Table C3.

[0309] It should be understood that in R15, the type1 double symbol corresponds to 8 R15 ports. In R18, the type1 double symbol is enhanced to obtain 16 R18 ports. The first 8 ports (i.e., the pre-extended ports) of the 16 R18 ports are included in Table A3, and the FD-OCC length corresponding to the ports is 4. The 16 R18 ports are included in Table B3, and the FD-OCC length corresponding to the ports is 4. The 8 R15 ports are included in Table C3, and the FD-OCC length corresponding to the ports is 2.

[0310] Table A3 (both are R15): the DMRS type information indicates the first DMRS type, the first DMRS configuration information indicates the first value, double symbol. The antenna port index group set corresponding to Table A3 can be recorded as the first antenna port index group set #3.

[0311]

[0312] Table B3 (both are R18): the DMRS type information indicates the third DMRS type, the first DMRS configuration information indicates the second value, double symbol. The antenna port index group set corresponding to Table B3 can be recorded as the second antenna port index group set #3.

[0313]

[0314] Table C3 (one R15, one R18): the DMRS type information indicates the first DMRS type, the first DMRS configuration information indicates the second value, double symbol. Alternatively, the DMRS type information indicates the third DMRS type, the first DMRS configuration information indicates the first value, double symbol. The antenna port index group set corresponding to Table C3 can be recorded as the third antenna port index group set #3.

[0315]

[0316] The second implementation manner: the antenna port table determined by the terminal device can be one of the following Table A4, Table B4 and Table C4.

[0317] It should be understood that in R15, the type1 double symbol corresponds to 8 R15 ports. In R18, the type1 double symbol is enhanced to obtain 16 R18 ports. The first 8 ports (i.e., the pre-extended ports) of the 16 R18 ports are included in Table A3, and the FD-OCC length corresponding to the ports is 4. The 16 R18 ports are included in Table B3, and the FD-OCC length corresponding to the ports is 4. The 8 R15 ports are included in Table C3, and the FD-OCC length corresponding to the ports is 2.

[0318] Table A4 (both R15): the DMRS type information indicates the first DMRS type, the first DMRS configuration information indicates a first value, double symbol. The antenna port index group set corresponding to Table A4 can be recorded as a first antenna port index group set #4.

[0319]

[0320] Table B4 (both R18): the DMRS type information indicates the third DMRS type, the first DMRS configuration information indicates a second value, double symbol. The antenna port index group set corresponding to Table B4 can be recorded as a second antenna port index group set #4.

[0321]

[0322] Table C4 (one R15, one R18): the DMRS type information indicates the first DMRS type, the first DMRS configuration information indicates a second value, double symbol. Alternatively, the DMRS type information indicates the third DMRS type, the first DMRS configuration information indicates a first value, double symbol. The antenna port index group set corresponding to Table C4 can be recorded as a third antenna port index group set #4.

[0323]

[0324]

[0325] Case 3:

[0326] The DMRS type information indicates the second DMRS type or the fourth DMRS type, and is a single symbol.

[0327] The case 3 can be further divided into two implementation manners, which are described below.

[0328] The first implementation manner: the antenna port table determined by the terminal device can be one of the following Table A5, Table B5 and Table C5.

[0329] It should be understood that, in R15, type2 single symbol corresponds to 6 R15 ports. In R18, the enhancement of type2 single symbol can obtain 12 R18 ports. The first 6 ports (i.e., the ports before expansion) of the 12 R18 ports are included in Table A5, and the FD-OCC length corresponding to the ports is 4. The 12 R18 ports are included in Table B5, and the FD-OCC length corresponding to the ports is 4. The 6 R15 ports are included in Table C5, and the FD-OCC length corresponding to the ports is 2.

[0330] Table A5 (both are R15): DMRS type information indicates the second DMRS type, first DMRS configuration information indicates the first value, single symbol. The antenna port index group set corresponding to Table A5 can be recorded as the first antenna port index group set #5.

[0331]

[0332] Table B5 (both are R18): DMRS type information indicates the fourth DMRS type, and the first DMRS configuration information indicates the second value, single symbol. The antenna port index group set corresponding to Table B5 can be recorded as the second antenna port index group set #5.

[0333]

[0334]

[0335] Table C5 (one R15, one R18): DMRS type information indicates the second DMRS type, the first DMRS configuration information indicates the second value, and a single symbol; or, DMRS type information indicates the fourth DMRS type, the first DMRS configuration information indicates the first value, and a single symbol. The antenna port index group set corresponding to Table C5 can be recorded as third antenna port index group set #5.

[0336]

[0337] The second implementation method: The antenna port table determined by the terminal device can be one of the following Table A6, Table B6 and Table C6.

[0338] It should be understood that in R15, a single Type 2 symbol corresponds to 6 R15 ports. In R18, enhancing a single Type 2 symbol yields 12 R18 ports. Table A6 includes these 6 R15 ports, and the corresponding FD-OCC length is 2. Table B6 includes the last 6 of these 12 R18 ports (i.e., the extended ports), and the corresponding FD-OCC length is 4. Table C6 includes these 12 R18 ports.

[0339] Table A6 (both are R15): DMRS type information indicates the second DMRS type, first DMRS configuration information indicates the first value, single symbol. The antenna port index group set corresponding to Table A6 can be recorded as the first antenna port index group set #6.

[0340]

[0341] Table B6 (both R18): DMRS type information indicates the fourth DMRS type, the first DMRS configuration information indicates the second value, single symbol. The antenna port index group set corresponding to Table B6 can be recorded as the second antenna port index group set #6.

[0342]

[0343] Table C6 (one R15, one R18): DMRS type information indicates the second DMRS type, the first DMRS configuration information indicates the second value, single symbol; or, DMRS type information indicates the fourth DMRS type, the first DMRS configuration information indicates the first value, single symbol. The antenna port index group set corresponding to Table C6 can be recorded as the third antenna port index group set #6.

[0344]

[0345] Case 4:

[0346] The DMRS type information indicates the second DMRS type (type2) or the fourth DMRS type (type2-E), and is a double symbol.

[0347] The case 4 can be further divided into two implementation manners, and the two implementation manners will be described below.

[0348] The first implementation manner: the antenna port table determined by the terminal device can be one of the following Tables A7, B7 and C7.

[0349] It should be understood that, in R15, type2 double symbol corresponds to 12 R15 ports. In R18, the enhancement of type2 double symbol can obtain 24 R18 ports. The first 12 ports of the 24 R18 ports are included in Table A7, and the FD-OCC length corresponding to the ports is 4. The 24 R18 ports are included in Table B7, and the FD-OCC length corresponding to the ports is 4. The 12 R15 ports are included in Table C7.

[0350] Table A7 (both R15): DMRS type information indicates the second DMRS type, the first DMRS configuration information indicates the first value, double symbol. The antenna port index group set corresponding to Table A7 can be recorded as the first antenna port index group set #7.

[0351]

[0352]

[0353] Table B7-1 and Table B7-2 (both R18): DMRS type information indicates the fourth DMRS type, the first DMRS configuration information indicates the second value, double symbol. The corresponding antenna port index group set of Table B7-1 can be recorded as the second antenna port index group set #7. The corresponding antenna port index group set of Table B7-2 can be recorded as the second antenna port index group set #8.

[0354] Table B7-1 ：

[0355]

[0356]

[0357] Table B7-2

[0358]

[0359] Table C7 (one R15, one R18): DMRS type information indicates the second DMRS type, the first DMRS configuration information indicates the second value, double symbol; or, DMRS type information indicates the fourth DMRS type, the first DMRS configuration information indicates the first value, double symbol. The corresponding antenna port index group set of Table C7 can be recorded as the third antenna port index group set #7.

[0360]

[0361]

[0362]

[0363] The second implementation manner: the antenna port table determined by the terminal device can be one of the following Table A8, Table B8 and Table C8.

[0364] It should be understood that, in R15, 12 R15 ports correspond to type2 double symbol. In R18, 24 R18 ports can be obtained by enhancing type2 double symbol. The 12 R15 ports are included in Table A8, and the FD-OCC length corresponding to the ports is 2. The last 12 R18 ports (i.e., extended ports) in the 24 R18 ports are included in Table B8, and the FD-OCC length corresponding to the ports is 4. The 24 R18 ports are included in Table C8.

[0365] Table A8 (both R15): DMRS type information indicates the second DMRS type, the first DMRS configuration information indicates the first value, double symbol. The corresponding antenna port index group set of Table A8 can be recorded as the first antenna port index group set #8.

[0366]

[0367]

[0368] Table B8 (both R18): the DMRS type information indicates the fourth DMRS type, the first DMRS configuration information indicates the second value, double symbol. The antenna port index group set corresponding to Table B8 can be recorded as the second antenna port index group set #9.

[0369]

[0370]

[0371] Table C8-1 and Table C8-2 (one R15, one R18): the DMRS type information indicates the second DMRS type, the first DMRS configuration information indicates the second value, double symbol; or, the DMRS type information indicates the fourth DMRS type, the first DMRS configuration information indicates the first value, double symbol. The antenna port index group set corresponding to Table C8-1 can be recorded as the third antenna port index group set #8. The antenna port index group set corresponding to Table C8-2 can be recorded as the third antenna port index group set #9.

[0372] Table C8-1:

[0373]

[0374]

[0375]

[0376]

[0377] Table C8-2:

[0378]

[0379]

[0380]

[0381]

[0382] S505, the terminal device determines a first antenna port index group from the antenna port index group set according to the antenna port indication information.

[0383] Optionally, the terminal device can also determine the number of CDM groups in which no data is sent on the symbol where the DMRS is located.

[0384] According to the method 500, the terminal device can flexibly switch the antenna port table according to the DMRS configuration information indicated by the DCI signaling, so as to realize the switching of the R15 port and the R18 port, and / or the switching of the 2-long FD-OCC and the 4-long FD-OCC.

[0385] The method 200 is described in detail below in combination with the method 600. In the method 600, the FD-OCC length of the port can be jointly indicated by the DMRS type information and the DMRS configuration information configured by the RRC signaling, and the switching of the R15 port and the R18 port, and / or the switching of the 2-long FD-OCC and the 4-long FD-OCC can be realized by different DCI signaling. As shown in the method 600, the method 600 specifically includes the following steps. Figure 6

[0386] S601, the network device sends RRC signaling to the terminal device. Accordingly, the terminal device receives the RRC signaling.

[0387] The process is the same as S401, and specific reference can be made to the description in S401.

[0388] S602, the network device sends DCI signaling to the terminal device. Accordingly, the terminal device receives the DCI signaling from the network device.

[0389] The process is the same as S402, and specific reference can be made to the description in S402.

[0390] S603, the terminal device determines first DMRS configuration information from at least one DMRS configuration information according to the DCI signaling, the first DMRS configuration information corresponding to first time domain resource allocation information.

[0391] Reference can be made to S203 for the process.

[0392] S604, the terminal device determines a plurality of antenna port index group sets according to the DMRS type information.

[0393] Specifically, the terminal device determines an antenna port table (or referred to as a DMRS port table) according to the DMRS type information and the “maxLength” parameter, the antenna port table including a plurality of antenna port index groups and a corresponding relationship between a plurality of indexes.

[0394] S604 is described below in different cases.

[0395] Case 1:

[0396] ​When the DMRS type information indicates the first DMRS type or the third DMRS type, and is a single symbol, the antenna port table determined by the terminal device can be as shown in Table D1. It should be understood that Table A1, Table B1 and Table C1 in S504 are respectively a part of Table D1. Similarly, Table A2, Table B2 and Table C2 in S504 are respectively a part of Table D1.

[0397] Table D1 ：

[0398]

[0399]

[0400] Case 2:

[0401] When the DMRS type information indicates the first DMRS type or the third DMRS type, and is a double symbol, the antenna port table determined by the terminal device can be as shown in Table D2. It should be understood that Table A3, Table B3 and Table C3 in S504 are respectively a part of Table D2. Similarly, Table A4, Table B4 and Table C4 in S504 are respectively a part of Table D2.

[0402] Table D2 ：

[0403]

[0404]

[0405]

[0406]

[0407] Case 3:

[0408] When the DMRS type information indicates the second DMRS type or the fourth DMRS type, and is a single symbol, the antenna port table determined by the terminal device can be as shown in Table D3. It should be understood that Table A5, Table B5 and Table C5 in S504 are respectively a part of Table D3. Similarly, Table A6, Table B6 and Table C6 in S504 are respectively a part of Table D3.

[0409] Table D3 ；

[0410]

[0411]

[0412]

[0413] When the DMRS type information indicates the second DMRS type or the fourth DMRS type, and is a double symbol, the antenna port table determined by the terminal device can be as shown in Table D4-1 or Table D4-2.

[0414] Table D4-1:

[0415]

[0416]

[0417]

[0418]

[0419]

[0420]

[0421] Table D4-2 ：

[0422]

[0423]

[0424]

[0425]

[0426]

[0427]

[0428] Each of the above Tables D1 to D4 includes one or more of the following features. Take Table D1 as an example for illustration.

[0429] Feature 1:

[0430] Among the plurality of antenna port index groups included in Table D1, there are two antenna port index groups that each include a same port (denoted as port #A), but the port #A corresponds to different FD-OCC lengths in the two antenna port index groups.

[0431] For example, the port 0 corresponding to “index = 29” in Table D1 is FD-OCC2 long, and the port 0 corresponding to “index = 0” is FD-OCC4 long.

[0432] Feature 2:

[0433] Table D1 includes a plurality of antenna port index groups, and there are two ports (denoted as port #B and port #C) in a same CDM group in some of the plurality of antenna port index groups, and the port #B is an R15 port and the port #C is an R18 port.

[0434] For example, for "index = 40" in Table D1, it indicates a port combination corresponding to a 2-length non-orthogonal sequence in a 4-length orthogonal sequence.

[0435] Feature 3:

[0436] Table D1 includes a plurality of antenna port index groups, and there is an antenna port index group including port #D and port #E in the antenna port index group, but the FD-OCC length corresponding to the port #D is different from the FD-OCC length corresponding to the port #E.

[0437] For example, for the antenna port index group "0 (FD-OCC2), 1, 9" corresponding to "index = 42" in Table D1, the FD-OCC length corresponding to port 0 is 2 and the FD-OCC length corresponding to port 9 is 4.

[0438] Feature 4:

[0439] All mandatory combinations including R18 ports in Table D1.

[0440] Feature 5:

[0441] All combinations including R15 ports in Table D1. Alternatively, all combinations not including R15 ports in Table D1.

[0442] S605, the terminal device determines a first antenna port index group from the set of antenna port index groups according to the antenna port indication information.

[0443] Optionally, the terminal device can further determine the number of CDM groups in which no data is transmitted on the symbol where the DMRS is located.

[0444] S6e6, the terminal device determines the frequency domain mask length corresponding to the ports in the first antenna port index group according to the DMRS type information and the first DMRS configuration information.

[0445] When the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the first value, the frequency domain mask length corresponding to the ports in the first antenna port index group is 2.

[0446] When the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the second value, the frequency domain mask length corresponding to the ports in the first antenna port index group is 4.

[0447] When the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the first value, the frequency domain mask length of the port corresponding to the port pair in the first antenna port index group is 2.

[0448] When the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, the first antenna port index group includes the port with the frequency domain mask length of 2 and the port with the frequency domain mask length of 4. In other words, the FD-OCC length of the port defined in R15 in the first antenna port index group is 2, and the FD-OCC length of the newly added port in R18 is 4.

[0449] According to the method 600 of the embodiment of the present application, the network device can send different DCI signaling to indicate different DMRS configuration information, so as to realize the switching of the FD-OCC length.

[0450] According to the foregoing method, Figure 7 A communication apparatus is provided for the embodiments of the present application, and the communication apparatus includes a transceiver unit 701 and a processing unit 702.

[0451] The transceiver unit 701 can be used to realize the corresponding information transceiving function. The transceiver unit 701 can also be referred to as a communication interface or a communication unit. The processing unit 702 can be used for processing operations.

[0452] Exemplarily, the apparatus further includes a storage unit, which can be used to store instructions and / or data. The processing unit 702 can read the instructions and / or data in the storage unit, so that the apparatus realizes the actions of the apparatus in the foregoing various method embodiments.

[0453] As a first implementation manner, the apparatus can be a terminal device in the foregoing embodiments, or can be a component (such as a chip) of the terminal device. The transceiver unit and the processing unit can be used to realize the related operations of the terminal device in the foregoing various method embodiments. Exemplarily, the transceiver unit is used to realize S201 and S202, and the processing unit is used to realize S203. Alternatively, the transceiver unit is used to realize S301 and S302, and the processing unit is used to realize S303, S304 and S305. Alternatively, the transceiver unit is used to realize S401 and S402, and the processing unit is used to realize S403, S404, S405 and S406. Alternatively, the transceiver unit is used to realize S501 and S502, and the processing unit is used to realize S503, S504 and S505. Alternatively, the transceiver unit is used to realize S601 and S602, and the processing unit is used to realize S603, S604, S605 and S606.

[0454] As a second implementation method, the device can be the network device in the aforementioned embodiment, or it can be a component of the network device (such as a chip). Among them, the transceiver unit and the processing unit can be used to implement the relevant operations of the network device in each method embodiment above. Exemplarily, the transceiver unit is used to implement S201 and S202. Alternatively, the transceiver unit is used to implement S301 and S302. Alternatively, the transceiver unit is used to implement S401 and S402. Alternatively, the transceiver unit is used to implement S501 and S502. Alternatively, the transceiver unit is used to implement S601 and S602.

[0455] It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0456] The transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor to respectively perform the transceiver operations and related processing operations in each method embodiment.

[0457] In addition, the transceiver unit 701 may also be a transceiver circuit (for example, may include a receiving circuit and a sending circuit), and the processing unit may be a processing circuit.

[0458] It should be understood that Figure 7 The device in the embodiment can be the device in the aforementioned method, or it can be a chip or chip system, such as a system on chip (SoC). The transceiver unit can be an input / output circuit or a communication interface; the processing unit can be a processor, microprocessor, or integrated circuit integrated on the chip. This is not limited here.

[0459] The present application also provides a communication device, such as Figure 8 As shown, the system includes a processor 801 and a communication interface 802. The processor 801 is configured to execute computer programs or instructions stored in a memory 803, or read data stored in the memory 803, to perform the methods described in the above method embodiments. Exemplarily, there are one or more processors 801. The communication interface 802 is configured to receive and / or transmit signals. For example, the processor 801 is configured to control the communication interface 802 to receive and / or transmit signals.

[0460] For example, Figure 8As shown, the communication apparatus can further include a memory 803 for storing computer programs or instructions and / or data. The memory 803 can be integrated with the processor 801, or can be separately arranged. Of course, the communication apparatus can also not include the memory 803, which is arranged outside the communication apparatus. Exemplarily, the memory 803 can be one or more of a ROM, a RAM, a flash memory, and a hard disk.

[0461] Exemplarily, the processor 801, the communication interface 802, and the memory 803 are connected with each other through a bus 804; the bus 804 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The above bus 804 can be divided into an address bus, a data bus, and a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the figure, but it does not mean that there is only one bus or only one type of bus.

[0462] As the first implementation manner, the apparatus can be the terminal device in the foregoing embodiments, or can be a component (such as a chip) of the terminal device. The communication interface and the processor can be used to implement the related operations of the terminal device in the foregoing method embodiments. Exemplarily, the communication interface is used to implement S201 and S202, and the processor is used to implement S203. Alternatively, the communication interface is used to implement S301 and S302, and the processor is used to implement S303, S304, and S305. Alternatively, the communication interface is used to implement S401 and S402, and the processor is used to implement S403, S404, S405, and S406. Alternatively, the communication interface is used to implement S501 and S502, and the processor is used to implement S503, S504, S505. Alternatively, the communication interface is used to implement S601 and S602, and the processor is used to implement S603, S604, S605, and S606.

[0463] As the second implementation manner, the apparatus can be the network device in the foregoing embodiments, or can be a component (such as a chip) of the network device. The communication interface and the processor can be used to implement the related operations of the network device in the foregoing method embodiments. Exemplarily, the communication interface is used to implement S201 and S202. Alternatively, the communication interface is used to implement S301 and S302. Alternatively, the communication interface is used to implement S401 and S402. Alternatively, the communication interface is used to implement S501 and S502. Alternatively, the communication interface is used to implement S601 and S602.

[0464] It should be understood that the processor (e.g., the processor 801) mentioned in the embodiments of the present application can be a central processing unit (CPU), a network processor (NP), or a combination thereof. The processor can further include a hardware chip. The hardware chip can be an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0465] It should also be understood that the memory (e.g., the memory 803) mentioned in the embodiments of the present application can be a volatile memory or a nonvolatile memory, or can include both volatile and nonvolatile memory. The nonvolatile memory can be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM) used as an external cache.

[0466] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware, or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0467] In several embodiments provided in the present application, the disclosed system, device and method can be implemented in other manners. For example, the above described device embodiments are merely illustrative, and the division of units is merely logical function division, and there can be another division manner in actual implementation. For example, the units in the various embodiments of the present application can be integrated in a unit, or each unit can exist physically, or two or more units can be integrated in a unit.

[0468] If the embodiments of the present application are implemented in the form of software, and sold or used as an independent product, the corresponding computer program (also called code or instructions) can be stored in a computer readable storage medium. The present application provides a computer readable storage medium, including a computer program, when the computer program is run on a computer, the computer executes any one of the possible implementations of the above method embodiments.

[0469] The computer readable storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media that can store program codes.

[0470] The technical solutions of the present application can be embodied in the form of a software product. Therefore, the present application also provides a computer program product, which includes a computer program, when the computer program is run, the computer executes any one of the possible implementations of the above method embodiments.

[0471] In addition, the embodiments of the present application also provide a chip system (or chip). The chip system includes a logic circuit and an input / output interface.

[0472] The logic circuit can be a processing circuit in the chip system. The logic circuit can be coupled to a storage unit to call instructions in the storage unit, so that the chip system can implement the methods and functions of the embodiments of the present application. The input / output interface can be an input / output circuit in the chip system, which outputs the information processed by the chip system, or inputs the data or signaling information to be processed by the chip system.

[0473] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: Comprising: A terminal device acquires at least one time domain resource allocation information and at least one demodulation reference signal (DMRS) configuration information, the at least one time domain resource allocation information and the at least one DMRS configuration information corresponding to each other; The terminal device receives a downlink control information (DCI) signaling from a network device, the DCI signaling including a first index, the first index being used to indicate a first time domain resource allocation information, the first time domain resource allocation information being one of the at least one time domain resource allocation information; The terminal device determines a first DMRS configuration information from the at least one DMRS configuration information according to the DCI signaling, the first DMRS configuration information corresponding to the first time domain resource allocation information.

2. The method of claim 1, wherein The terminal device acquires the at least one time domain resource allocation information and the at least one DMRS configuration information comprises: The terminal device receives a radio resource control (RRC) signaling from the network device, the RRC signaling including a time domain resource allocation (TDRA) field, the TDRA field being used to configure the at least one time domain resource allocation information and the at least one DMRS configuration information.

3. The method of claim 2, wherein The RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first type and a second type, and the DCI signaling further includes antenna port indication information; The method further comprises: The terminal device determines a set of antenna port index groups according to the DMRS type information and the first DMRS configuration information; The terminal device determines a first antenna port index group from the set of antenna port index groups according to the antenna port indication information.

4. The method of claim 3, wherein When the DMRS type information indicates the first type and the first DMRS configuration information indicates a first value, a first DMRS type is corresponding; When the DMRS type information indicates the second type and the first DMRS configuration information indicates the first value, a second DMRS type is corresponding; When the DMRS type information indicates the first type and the first DMRS configuration information indicates a second value, a third DMRS type is corresponding; When the DMRS type information indicates the second type and the first DMRS configuration information indicates the second value, a fourth DMRS type is corresponding.

5. The method of claim 3, wherein When the first DMRS configuration information indicates the first value, ports in the set of antenna port index groups belong to a first DMRS port set; When the first DMRS configuration information indicates the second value, ports in the set of antenna port index groups belong to a second DMRS port set.

6. The method of claim 2, wherein The RRC signaling further comprises DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type and a fourth DMRS type, and the DCI signaling further comprises antenna port indication information; The method further comprises: The terminal device determines, according to the DMRS type information, a set of antenna port index groups; The terminal device determines, according to the antenna port indication information, a first antenna port index group from the set of antenna port index groups; The terminal device determines, according to the first DMRS configuration information, a frequency domain mask length corresponding to a port in the first antenna port index group.

7. The method of claim 6, wherein: when the DMRS type information indicates the first DMRS type or the second DMRS type, ports in the set of antenna port index groups belong to a first DMRS port set; and when the DMRS type information indicates the third DMRS type or the fourth DMRS type, ports in the set of antenna port index groups belong to a second DMRS port set.

8. The method of any one of claims 6-7, wherein: The terminal device determines a frequency domain mask length of a port in the first antenna port index group, comprising: when the first DMRS configuration information indicates a first value, the terminal device determines that the frequency domain mask length corresponding to the port in the first antenna port index group is 2; and when the first DMRS configuration information indicates a second value, the terminal device determines that the frequency domain mask length corresponding to the port in the first antenna port index group is 4.

9. The method of claim 2, wherein: The RRC signaling further comprises DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type and a fourth DMRS type, and the DCI signaling further comprises antenna port indication information; The method further comprises: The terminal device determines, according to the DMRS type information and the first DMRS configuration information, a set of antenna port index groups; The terminal device determines, according to the antenna port indication information, a first antenna port index group from the set of antenna port index groups.

10. The method of claim 9, wherein: The set of antenna port index groups satisfies any one of the following: when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates a first value, the set of antenna port index groups is a first set of antenna port index groups; and when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates a second value, the set of antenna port index groups is a second set of antenna port index groups. when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, the antenna port index group set is a third antenna port index group set.

11. The method of claim 9, wherein, when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the first value, the ports in the antenna port index group set belong to a subset of a second DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the second value, the ports in the antenna port index group set belong to a second DMRS port set; when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, the ports in the antenna port index group set belong to a first DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the first value, the ports in the antenna port index group set belong to a first DMRS port set.

12. The method of claim 9, wherein, when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the first value, the ports in the antenna port index group set belong to a first DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the second value, the ports in the antenna port index group set belong to a subset of a second DMRS port set; when the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, the ports in the antenna port index group set belong to a second DMRS port set; when the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the first value, the ports in the antenna port index group set belong to a second DMRS port set.

13. The method of claim 2, wherein, the RRC signaling further comprises DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and the DCI signaling further comprises antenna port indication information; the method further comprises: The terminal device determines, according to the DMRS type information, a set of antenna port index groups; The terminal device determines, according to the antenna port indication information, a first antenna port index group from the set of antenna port index groups; The terminal device determines, according to the DMRS type information and the first DMRS configuration information, a frequency domain mask length corresponding to a port in the first antenna port index group.

14. The method of claim 13, wherein The set of antenna port index groups includes a second antenna port index group and a third antenna port index group, and a frequency domain mask length of a first port in the second antenna port index group is different from a frequency domain mask length of the first port in the third antenna port index group.

15. The method of claim 13, wherein The set of antenna port index groups includes a second port and a third port, the second port and the third port are in a same CDM group, the second port is a port in a first DMRS port set, and the third port is a port in a second DMRS port set.

16. The method of claim 13, wherein The set of antenna port index groups includes a fourth antenna port index group, and the fourth antenna port index group includes a fourth port and a fifth port, a frequency domain mask length corresponding to the fourth port is different from a frequency domain mask length corresponding to the fifth port.

17. The method of any one of claims 13-16, wherein The terminal device determines the frequency domain mask length corresponding to the port in the first antenna port index group by: When the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates a first value, the terminal device determines that the frequency domain mask length corresponding to the port in the first antenna port index group is 2; When the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates a second value, the terminal device determines that the frequency domain mask length corresponding to the port in the first antenna port index group is 4; When the DMRS type information indicates the third DMRS type or the fourth DMRS type, and the first DMRS configuration information indicates the first value, the terminal device determines that the frequency domain mask length corresponding to the port in the first antenna port index group is 2; When the DMRS type information indicates the first DMRS type or the second DMRS type, and the first DMRS configuration information indicates the second value, the terminal device determines that the first antenna port index group includes a port with a frequency domain mask length of 2 and a port with a frequency domain mask length of 4.

18. The method of any one of claims 5, 7, 11, 12, and 15, wherein A frequency domain mask length corresponding to a port in the first DMRS port set is 2, and a frequency domain mask length corresponding to a port in the second DMRS port set is 4.

19. The method of any one of claims 3, 6, 9, 13, wherein a plurality of antenna port index groups included in the set of antenna port index groups correspond to a plurality of indexes, and the antenna port indication information is used to indicate one of the plurality of indexes. comprising:

20. A method of communication, comprising: sending, by a network device, radio resource control (RRC) signaling to a terminal device, the RRC signaling including a time domain resource allocation (TDRA) field, the TDRA field being used to configure at least one time domain resource allocation information and at least one demodulation reference signal (DMRS) configuration information, the at least one time domain resource allocation information and the at least one DMRS configuration information corresponding to each other; sending, by the network device, downlink control information (DCI) signaling to the terminal device, the DCI signaling including a first index, the first index being used to indicate a first time domain resource allocation information, the first time domain resource allocation information being one of the at least one time domain resource allocation information.

21. The method of claim 20, wherein the first time domain resource allocation information corresponds to a first DMRS configuration information; the first DMRS configuration information indicates a first value, the first value corresponding to any one of: a frequency domain mask length of a DMRS port being 2, a protocol version being r15; or the first DMRS configuration information indicates a second value, the second value corresponding to any one of: a frequency domain mask length of a DMRS port being 4, a protocol version being r18.

22. The method of claim 20 or 21, wherein the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first type and a second type, and the DCI signaling further includes antenna port indication information.

23. The method of claim 20 or 21, wherein the RRC signaling further includes DMRS type information, the DMRS type information indicating any one of a first DMRS type, a second DMRS type, a third DMRS type, and a fourth DMRS type, and the DCI signaling further includes antenna port indication information. comprising: a transceiver unit and a processing unit connected to the transceiver unit, the transceiver unit being configured to obtain at least one time domain resource allocation information and at least one demodulation reference signal (DMRS) configuration information, the at least one time domain resource allocation information and the at least one DMRS configuration information corresponding to each other; the transceiver unit being further configured to receive, from a network device, downlink control information (DCI) signaling, the DCI signaling including a first index, the first index being used to indicate a first time domain resource allocation information, the first time domain resource allocation information being one of the at least one time domain resource allocation information; the processing unit being configured to determine, according to the DCI signaling, a first DMRS configuration information from the at least one DMRS configuration information, the first DMRS configuration information corresponding to the first time domain resource allocation information. comprising: ​ 24. A communications device, characterized by ​ ​ ​ ​ ​ 25. A communications device, characterized by ​ a communications interface and a processor for executing computer programs or instructions, causing the communications device to perform the method of any of claims 1-23.

26. A computer-readable storage medium, characterized in that, comprising computer programs or instructions which, when run on a computer, cause the computer to perform the method of any of claims 1-23.

27. A computer program product, characterised in that, comprising instructions which, when run on a computer, cause the computer to perform the method of any of claims 1-23.

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