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EP-4742742-A1 - COMMUNICATION METHOD AND APPARATUS

EP4742742A1EP 4742742 A1EP4742742 A1EP 4742742A1EP-4742742-A1

Abstract

This application relates to a communication method and apparatus. In the method, when first information indicates an SDM scheme or an SFN scheme, second information may include two PTRS-DMRS fields, and one of the PTRS-DMRS fields is 0 bits. In this way, bit overheads of DCI can be reduced. In addition, a first field in the second information clearly indicates a specific transmission scheme to be used by a terminal device.

Inventors

  • YANG, Pei
  • FAN, BO
  • ZARIFI, Keyvan
  • CHEN, LEI
  • YU, ZHENG

Assignees

  • Huawei Technologies Co., Ltd.

Dates

Publication Date
20260513
Application Date
20240726

Claims (18)

  1. A communication method, comprising: receiving first information, wherein the first information indicates a first transmission scheme, and the first transmission scheme comprises a spatial domain multiplexing SDM scheme or a single frequency network SFN scheme; and receiving second information, wherein the second information comprises a first field, the first field indicates a terminal device to use the first transmission scheme or a second transmission scheme, and the second transmission scheme is a single transmission reception point sTRP scheme, wherein the second information further comprises a second field and a third field, the second field is a phase tracking reference signal PTRS-demodulation reference signal DMRS field, the third field is a 2 nd PTRS-DMRS field, and the third field is 0 bits.
  2. The method according to claim 1, wherein the second field indicates at least one DMRS port associated with at least one PTRS port.
  3. The method according to claim 1 or 2, wherein when a maximum number of layers associated with the second transmission scheme is greater than 2, the third field is 0 bits, wherein the maximum number of layers associated with the second transmission scheme is indicated by third information.
  4. The method according to any one of claims 1 to 3, wherein the method further comprises: sending capability information, wherein the capability information indicates that the terminal device supports full-coherent uplink transmission, wherein a number of PTRS ports associated with the SDM scheme is greater than or equal to 2.
  5. The method according to any one of claims 1 to 4, wherein when both a maximum number of layers associated with the first transmission scheme and the maximum number of layers associated with the second transmission scheme are equal to 1, the second field is 0 bits, wherein the maximum number of layers associated with the first transmission scheme is indicated by fourth information, and the maximum number of layers associated with the second transmission scheme is indicated by the third information.
  6. The method according to any one of claims 1 to 4, wherein when a maximum number of layers associated with the first transmission scheme is greater than 1 or the maximum number of layers associated with the second transmission scheme is greater than 1, the second field is greater than 0 bits, wherein the maximum number of layers associated with the first transmission scheme is indicated by fourth information, and the maximum number of layers associated with the second transmission scheme is indicated by the third information.
  7. A communication method, comprising: sending first information, wherein the first information indicates a first transmission scheme, and the first transmission scheme comprises a spatial domain multiplexing SDM scheme or a single frequency network SFN scheme; and sending second information, wherein the second information comprises a first field, the first field indicates a terminal device to use the first transmission scheme or a second transmission scheme, and the second transmission scheme is a single transmission reception point sTRP scheme, wherein the second information further comprises a second field and a third field, the second field is a PTRS-DMRS field, the third field is a 2 nd PTRS-DMRS field, and the third field is 0 bits.
  8. The method according to claim 7, wherein the second field indicates at least one demodulation reference signal DMRS port associated with at least one phase tracking reference signal PTRS port.
  9. The method according to claim 7 or 8, wherein when a maximum number of layers associated with the second transmission scheme is greater than 2, the third field is 0 bits, wherein the maximum number of layers associated with the second transmission scheme is indicated by third information.
  10. The method according to any one of claims 7 to 9, wherein the method further comprises: sending capability information, wherein the capability information indicates that the terminal device supports full-coherent uplink transmission, wherein a number of PTRS ports associated with the SDM scheme is greater than or equal to 2.
  11. The method according to any one of claims 7 to 10, wherein when both a maximum number of layers associated with the first transmission scheme and the maximum number of layers associated with the second transmission scheme are equal to 1, the second field is 0 bits, wherein the maximum number of layers associated with the first transmission scheme is indicated by fourth information, and the maximum number of layers associated with the second transmission scheme is indicated by the third information.
  12. The method according to any one of claims 7 to 10, wherein when a maximum number of layers associated with the first transmission scheme is greater than 1 or the maximum number of layers associated with the second transmission scheme is greater than 1, the second field is greater than 0 bits, wherein the maximum number of layers associated with the first transmission scheme is indicated by fourth information, and the maximum number of layers associated with the second transmission scheme is indicated by the third information.
  13. A communication apparatus, comprising a unit or a module configured to implement the method according to any one of claims 1 to 12.
  14. A communication apparatus, wherein the communication apparatus comprises at least one processor and a memory, the memory is configured to store a computer program or instructions, and the at least one processor is configured to execute the computer program or the instructions in the memory, to perform the method according to any one of claims 1 to 12.
  15. A communication system, wherein the communication system comprises a terminal device and a network device, wherein the terminal device is configured to perform the method according to any one of claims 1 to 6; and the network device is configured to perform the method according to any one of claims 7 to 12.
  16. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions are executed, a computer is enabled to perform the method according to any one of claims 1 to 12.
  17. A computer program product, wherein the computer program product comprises computer program code, and when the computer program code is run by a computer, the computer is enabled to perform the method according to any one of claims 1 to 12.
  18. A chip, wherein the chip comprises at least one processor and an interface, the processor is configured to read and execute instructions stored in a memory, and when the instructions are run, the chip is enabled to perform the method according to any one of claims 1 to 12.

Description

This application claims priority to Chinese Patent Application No. 202311011226.7, filed with the China National Intellectual Property Administration on August 10, 2023 and entitled "COMMUNICATION METHOD AND APPARATUS", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a communication method and apparatus. BACKGROUND In communication technologies, a base station may schedule a terminal device by using downlink control information (downlink control information, DCI). Generally, a large amount of information needs to be indicated in the DCI, so that the terminal device performs subsequent uplink transmission. In other words, indicating the large amount of information needs a large number of bits (bits). Consequently, bit overheads of the DCI are excessively high. SUMMARY This application provides a communication method and apparatus, to reduce bit overheads of DCI. According to a first aspect, a communication method is provided. The method may be performed by a terminal device, may be performed by a module (for example, a processor, a chip, or a chip system) used in the terminal device, or may be implemented by a logical node, a logical module, or software that can implement all or some functions of the terminal device. In the communication method, first information may be received. The first information indicates a first transmission scheme, and the first transmission scheme includes a spatial domain multiplexing (spatial domain multiplexing, SDM) scheme or a single frequency network (single frequency network, SFN) scheme. Second information may be further received. The second information includes a first field, the first field indicates the terminal device to use the first transmission scheme or a second transmission scheme, and the second transmission scheme is a single transmission reception point (single transmitting and receiving point, sTRP) scheme. The second information further includes a second field and a third field, the second field is a phase tracking reference signal (phase tracking reference signal, PTRS)-demodulation reference signal (demodulation reference signal, DMRS) field, the third field is a 2nd PTRS-DMRS field, and the third field is 0 bits. It can be learned that in the foregoing implementation, when the first information indicates the SDM scheme or the SFN scheme, the second information may include two PTRS-DMRS fields, and one of the PTRS-DMRS fields is 0 bits. In this way, bit overheads of DCI can be reduced. In addition, the first field in the second information clearly indicates a specific transmission scheme to be used by the terminal device. Optionally, with reference to the first aspect, the second field indicates at least one DMRS port associated with at least one PTRS port. Optionally, with reference to the first aspect, when a maximum number of layers associated with the second transmission scheme is greater than 2, the third field is 0 bits. The maximum number of layers associated with the second transmission scheme is indicated by third information. Optionally, with reference to the first aspect, the method further includes: sending capability information, where the capability information indicates that the terminal device supports full-coherent uplink transmission; and a number of PTRS ports associated with the SDM scheme is greater than or equal to 2. It can be learned that in the foregoing implementation, when the terminal device supports full-coherent uplink transmission, the number of PTRS ports associated with the SDM scheme is greater than or equal to 2, so that different antenna panels can be associated with different PTRS ports when the terminal device performs data transmission based on the SDM scheme, thereby ensuring reliable SDM transmission. Optionally, with reference to the first aspect, when both a maximum number of layers associated with the first transmission scheme and the maximum number of layers associated with the second transmission scheme are equal to 1, the second field is 0 bits. The maximum number of layers associated with the first transmission scheme is indicated by fourth information, and the maximum number of layers associated with the second transmission scheme is indicated by the third information. It can be learned that in the foregoing implementation, a condition for the second field to be 0 bits is specified, so that reliable SDM transmission or SFN transmission can be ensured. In addition, when both the maximum number of layers associated with the first transmission scheme and the maximum number of layers associated with the second transmission scheme are equal to 1, a network device does not need to indicate, to the terminal device, the DMRS port associated with the PTRS port. In this way, the bit overheads of the DCI can be reduced. Optionally, with reference to the first aspect, when a maximum number of layers associa