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US-12628172-B2 - Control information transmission method, apparatus, and system

US12628172B2US 12628172 B2US12628172 B2US 12628172B2US-12628172-B2

Abstract

This application provide a control information transmission method, an apparatus, and a system. One example method includes: A first terminal device receives, from a network device, DCI used for indicating a BWP. A quantity of bits in the DCI is a fixed quantity of bits. The DCI is used for scheduling a physical data channel. The BWP is used to transmit the physical data channel.

Inventors

  • Juan Zheng
  • Chaojun Li
  • Hailong HOU
  • Yongqiang FEI

Assignees

  • HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date
20260512
Application Date
20221006
Priority Date
20200410

Claims (18)

  1. 1 . A control information transmission method, comprising: receiving downlink control information (DCI) from a network device, wherein a quantity of bits in the DCI is a fixed quantity of bits, the DCI is used for scheduling a physical data channel, the DCI indicates a bandwidth part (BWP), and the BWP is used to transmit the physical data channel, wherein the quantity of bits in the DCI is determined based on a bandwidth of a control-resource set (CORESET) #0, and wherein the quantity of bits in the DCI is further related to an index of a synchronization signal block (SSB), configuration information of a master information block (MIB) carried on a physical broadcast channel (PBCH) in the SSB, or configuration information of common search space (CSS) indicated by the PBCH.
  2. 2 . The method according to claim 1 , wherein the DCI comprises a downlink assignment index (DAI) field, wherein the DAI field indicates the BWP; or the DCI does not comprise a downlink assignment index (DAI) field.
  3. 3 . The method according to claim 1 , wherein the DCI comprises a downlink assignment index (DAI) field, wherein the DAI field comprises M1 bits, M2 bits in the M1 bits indicate the BWP, and M1 is a quantity of bits used when the network device sends the DAI field to a second terminal device.
  4. 4 . The method according to claim 1 , wherein the DCI comprises a downlink assignment index (DAI) field and a BWP indication field, wherein the DAI field comprises M1-M2 bits, the BWP indication field comprises M2 bits, the BWP indication field indicates the BWP, the DAI field indicates a quantity of downlink physical data channels transmitted in a transmission window of the downlink physical data channel, and M1 is a quantity of bits used when the network device sends the DAI field to a second terminal device.
  5. 5 . The method according to claim 1 , wherein the DCI comprises a physical uplink control channel (PUCCH) resource indicator field, wherein the PUCCH resource indicator field indicates the BWP; or the DCI does not comprise a physical uplink control channel (PUCCH) resource indicator field.
  6. 6 . The method according to claim 1 , wherein the DCI comprises a physical uplink control channel (PUCCH) resource indicator field and a BWP indication field, wherein the PUCCH resource indicator field comprises M3-M2 bits, the BWP indication field comprises M2 bits, the BWP indication field indicates the BWP, the PUCCH resource indicator field indicates a PUCCH resource, and M3 is a quantity of bits used when the network device sends the PUCCH resource indicator field to a second terminal device.
  7. 7 . An apparatus, comprising: one or more processors; and a memory having instructions stored thereon that, when executed by the one or more processors, cause the apparatus to: receive downlink control information (DCI) from a network device, wherein a quantity of bits in the DCI is a fixed quantity of bits, the DCI is used for scheduling a physical data channel, the DCI indicates a bandwidth part (BWP), and the BWP is used to transmit the physical data channel, wherein the quantity of bits in the DCI is determined based on a bandwidth of a control-resource set (CORESET) #0, and wherein the quantity of bits in the DCI is further related to an index of a synchronization signal block (SSB), configuration information of a master information block (MIB) carried on a physical broadcast channel (PBCH) in the SSB, or configuration information of common search space (CSS) indicated by the PBCH.
  8. 8 . The apparatus according to claim 7 , wherein the DCI comprises a downlink assignment index (DAI) field, wherein the DAI field indicates the BWP; or the DCI does not comprise a downlink assignment index (DAI) field.
  9. 9 . The apparatus according to claim 7 , wherein the DCI comprises a downlink assignment index (DAI) field, wherein the DAI field comprises M1 bits, M2 bits in the M1 bits indicate the BWP, and M1 is a quantity of bits used when the network device sends the DAI field to a second terminal device.
  10. 10 . The apparatus according to claim 7 , wherein the DCI comprises a downlink assignment index (DAI) field and a BWP indication field, wherein the DAI field comprises M1-M2 bits, the BWP indication field comprises M2 bits, the BWP indication field indicates the BWP, the DAI field indicates a quantity of downlink physical data channels transmitted in a transmission window of the downlink physical data channel, and M1 is a quantity of bits used when the network device sends the DAI field to a second terminal device.
  11. 11 . The apparatus according to claim 7 , wherein the DCI comprises a physical uplink control channel (PUCCH) resource indicator field, wherein the PUCCH resource indicator field indicates the BWP; or the DCI does not comprise a physical uplink control channel (PUCCH) resource indicator field.
  12. 12 . The apparatus according to claim 7 , wherein the DCI comprises a physical uplink control channel (PUCCH) resource indicator field and a BWP indication field, wherein the PUCCH resource indicator field comprises M3-M2 bits, the BWP indication field comprises M2 bits, the BWP indication field indicates the BWP, the PUCCH resource indicator field indicates a PUCCH resource, and M3 is a quantity of bits used when the network device sends the PUCCH resource indicator field to a second terminal device.
  13. 13 . A non-transitory computer readable medium, wherein the non-transitory computer readable medium stores instructions that are executable by a computer, and the instructions comprise instructions for: receiving downlink control information (DCI) from a network device, wherein a quantity of bits in the DCI is a fixed quantity of bits, the DCI is used for scheduling a physical data channel, the DCI indicates a bandwidth part (BWP), and the BWP is used to transmit the physical data channel, wherein the quantity of bits in the DCI is determined based on a bandwidth of a control-resource set (CORESET) #0, and wherein the quantity of bits in the DCI is further related to an index of a synchronization signal block (SSB), configuration information of a master information block (MIB) carried on a physical broadcast channel (PBCH) in the SSB, or configuration information of common search space (CSS) indicated by the PBCH.
  14. 14 . The non-transitory computer readable medium according to claim 13 , wherein the DCI comprises a downlink assignment index (DAI) field, wherein the DAI field indicates the BWP; or the DCI does not comprise a downlink assignment index (DAI) field.
  15. 15 . The non-transitory computer readable medium according to claim 13 , wherein the DCI comprises a downlink assignment index (DAI) field, wherein the DAI field comprises M1 bits, M2 bits in the M1 bits indicate the BWP, and M1 is a quantity of bits used when the network device sends the DAI field to a second terminal device.
  16. 16 . The non-transitory computer readable medium according to claim 13 , wherein the DCI comprises a downlink assignment index (DAI) field and a BWP indication field, wherein the DAI field comprises M1-M2 bits, the BWP indication field comprises M2 bits, the BWP indication field indicates the BWP, the DAI field indicates a quantity of downlink physical data channels transmitted in a transmission window of the downlink physical data channel, and M1 is a quantity of bits used when the network device sends the DAI field to a second terminal device.
  17. 17 . The non-transitory computer readable medium according to claim 13 , wherein the DCI comprises a physical uplink control channel (PUCCH) resource indicator field, wherein the PUCCH resource indicator field indicates the BWP; or the DCI does not comprise a physical uplink control channel (PUCCH) resource indicator field.
  18. 18 . The non-transitory computer readable medium according to claim 15 , wherein the DCI comprises a physical uplink control channel (PUCCH) resource indicator field and a BWP indication field, wherein the PUCCH resource indicator field comprises M3-M2 bits, the BWP indication field comprises M2 bits, the BWP indication field indicates the BWP, the PUCCH resource indicator field indicates a PUCCH resource, and M3 is a quantity of bits used when the network device sends the PUCCH resource indicator field to a second terminal device.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2021/085929, filed on Apr. 8, 2021, which claims priority to Chinese Patent Application No. 202010280705.9, filed on Apr. 10, 2020. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD The present application relates to the field of communication technologies, and in particular, to a control information transmission method, an apparatus, and a system. BACKGROUND With rapid development of a 5th generation (5G) mobile communication new radio (NR) technology, services such as an enhanced mobile broadband (eMBB) service, an ultra-reliable low-latency communication (URLLC) service, and a massive machine-type communications (mMTC) service are successively proposed. To help large-scale application of the foregoing services, most terminal devices require low costs. SUMMARY In view of this, an objective of embodiments of this application is to provide a control information transmission method, an apparatus, and a system, so as to avoid a technical problem that when a terminal device performs BWP switching, a large quantity of DCI formats are detected, detection complexity is high, and power consumption is high, which is not helpful in power saving. To achieve the foregoing objective, the following technical solutions are used in embodiments of this application. According to a first aspect, an embodiment of this application provides a control information transmission method. The method may be performed by a network device, a chip, or another apparatus. The method may include, sending, to a first terminal device, DCI used for indicating a BWP. A quantity of bits in the DCI is a fixed quantity of bits. The DCI is used for scheduling a physical data channel. The BWP is used to transmit the physical data channel. Based on the first aspect, the quantity of bits in the DCI that is sent by the network device to the first terminal device and that is used for indicating the BWP is fixed, so that when performing blind detection on the DCI sent by the network device, the first terminal device performs blind detection by using a detection apparatus with the fixed quantity of bits. In this way, data transmission efficiency is ensured, and a quantity of sizes of the DCI detected by the first terminal device can be reduced, so that a quantity of times that the first terminal device performs blind detection on the DCI is reduced, and detection complexity is reduced. Therefore, power consumption of the first terminal device is reduced, and an objective of power saving is achieved. This helps large-scale application of a service related to the first terminal device. In a possible design, with reference to the first aspect, that a quantity of bits in the DCI is a fixed quantity of bits includes: the quantity of bits in the DCI is predefined; the quantity of bits in the DCI is determined based on a maximum bandwidth supported by the first terminal device; the quantity of bits in the DCI is determined based on a bandwidth of a control-resource set (CORESET) #0; or the quantity of bits in the DCI is aligned with or the same as a quantity of bits in DCI used for scheduling common information, where the common information includes a system message, a paging message, or a random access response (RAR). Based on this possible design, in this embodiment of this application, the quantity of bits in the DCI used for indicating the BWP may be predefined, may be determined based on the maximum bandwidth supported by the first terminal device; may be determined based on the bandwidth of the CORESET #0; may be determined based on the DCI used for scheduling the common information; or may be determined in another manner. This is not limited. This provides a feasible solution for the network device to determine the quantity of bits in the DCI used for indicating the BWP. In a possible design, with reference to the first aspect or the possible designs of the first aspect, the DCI includes a DAI field used for indicating the BWP. Alternatively, the DCI does not include a downlink assignment index (DAI) field. In a possible design, with reference to the first aspect or the possible designs of the first aspect, the method further includes: determining, in a static codebook manner, a hybrid automatic repeat request (HARQ) feedback performed by the first terminal device to a downlink physical data channel transmitted in a transmission window of the downlink physical data channel. Based on the foregoing two possible designs, all bits in the DAI field in the DCI may be used for indicating the BWP, and the bits used for indicating the BWP may continue to be referred to as the DAI field. In this case, the quantity of bits used for indicating the BWP may be fixed. To be specific, the quantity of bits used for indicating the BWP is all the bits in the foregoing DAI field. Alternati