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US-12628184-B2 - Sidelink carrier management method and apparatus, and system

US12628184B2US 12628184 B2US12628184 B2US 12628184B2US-12628184-B2

Abstract

This application provides a sidelink carrier management method and apparatus, and a system. The method includes: A first communication apparatus obtains configuration information of a plurality of sidelink (SL) carriers. The first communication apparatus determines at least one SL carrier from the plurality of SL carriers. The first communication apparatus sends a first message to a second communication apparatus, where the first message includes information about the at least one SL carrier. According to the sidelink carrier management method provided in this application, a transmitting end communication apparatus determines at least one SL carrier for a unicast connection, and indicates the at least one SL carrier to a receiving end communication apparatus, to implement instant and effective management of the SL carrier. This improves SL carrier communication efficiency and a system capacity.

Inventors

  • Wenjie Peng

Assignees

  • HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date
20260512
Application Date
20230530

Claims (16)

  1. 1 . A sidelink carrier management method for a unicast communication between a first communication apparatus and a second communication apparatus, comprising: obtaining, by the first communication apparatus, configuration information of a plurality of sidelink (SL) carriers; determining, by the first communication apparatus, at least one SL carrier from the plurality of SL carriers; and sending, by the first communication apparatus, a first message to the second communication apparatus, wherein the first message comprises information about the determined at least one SL carrier; wherein the determined at least one SL carrier comprises a primary component carrier (PCC) and at least one secondary component carrier (SCC) from the plurality of SL carriers, wherein the PCC carries control information, and the control information is used to schedule a resource that is on the at least one SCC and that is used to transmit data.
  2. 2 . The method according to claim 1 , wherein the method further comprises: sending, by the first communication apparatus, a third message to a base station, wherein the third message comprises the information about the at least one SL carrier.
  3. 3 . The method according to claim 1 , wherein the method further comprises: sending, by the first communication apparatus, first information to the second communication apparatus at a location of a first physical sidelink shared channel (PSSCH) resource, wherein the location of the first PSSCH resource is on a first SCC, and the first SCC is any one of the at least one SCC; and receiving, by the first communication apparatus, hybrid automatic repeat request (HARQ) feedback information of the first information at a location of a first physical sidelink feedback channel (PSFCH) resource, wherein the location of the first PSFCH resource is determined based on the location of the first PSSCH resource, and the location of the first PSFCH resource is on the first SCC.
  4. 4 . The method according to claim 1 , wherein the method further comprises: sending, by the first communication apparatus, second information to the second communication apparatus at a location of a second physical sidelink shared channel (PSSCH) resource, wherein the location of the second PSSCH resource is on a second SCC, and the second SCC is any one of the at least one SCC; determining, by the first communication apparatus, a location of a second physical sidelink feedback channel (PSFCH) resource, wherein the location of the second PSFCH resource is on the PCC; and receiving, by the first communication apparatus, hybrid automatic repeat request (HARQ) feedback information of the second information at the location of the second PSFCH resource.
  5. 5 . The method according to claim 4 , wherein the information about the at least one SL carrier comprises an index of the second SCC and an identifier of a resource pool in which the second PSSCH is located.
  6. 6 . The method according to claim 5 , wherein the determining the location of the second PSFCH resource comprises: determining, by the first communication apparatus, the location of the second PSFCH resource based on at least one of the location of the second PSSCH resource, the index of the second SCC, or the identifier of the resource pool in which the second PSSCH is located; or determining, by the first communication apparatus, the location of the second PSFCH resource based on a location of a physical sidelink control channel (PSCCH) resource, wherein the PSCCH resource carries sidelink control information (SCI) indicating the location of the second PSSCH resource, and the location of the PSCCH resource is on the PCC.
  7. 7 . The method according to claim 6 , wherein the PSCCH resource and the second PSFCH resource are in a same resource pool.
  8. 8 . The method according to claim 1 , wherein the method further comprises: determining, by the first communication apparatus, that a period of time for switching between a first frequency band and a second frequency band is a first switch time, wherein the first frequency band and the second frequency band are frequency bands of the PCC and a third SCC, respectively, and the third SCC is any one of the at least one SCC; receiving, by the first communication apparatus, a fourth message sent by the second communication apparatus, wherein the fourth message comprises a second switch time, and the second switch time is a period of time for the second communication apparatus to switch between the first frequency band and the second frequency band; and determining, by the first communication apparatus, that a time interval is not less than a larger value of the first switch time and the second switch time, wherein the time interval is a time interval between an end time point of a first resource and a start time point of a second resource, the first resource belongs to the first frequency band, the second resource belongs to the second frequency band, and a time sequence of the first resource is before a time sequence of the second resource.
  9. 9 . A communication apparatus for performing a unicast communication with a second communication apparatus, comprising: at least one processor, and a memory storing instructions for execution by the at least one processor; wherein, when executed by the at least one processor, the instructions cause the apparatus to perform operations comprising: obtaining configuration information of a plurality of sidelink (SL) carriers; determining at least one SL carrier from the plurality of SL carriers; and sending a first message to the second communication apparatus, wherein the first message comprises information about the determined at least one SL carrier; the determined at least one SL carrier comprises a primary component carrier (PCC) and at least one secondary component carrier (SCC) from the plurality of SL carriers, wherein the PCC carries control information, and the control information is used to schedule a resource that is on the at least one SCC and that is used to transmit data.
  10. 10 . The communication apparatus according to claim 9 , wherein the operations further comprise: sending a third message to a base station, wherein the third message comprises the information about the at least one SL carrier.
  11. 11 . The communication apparatus according to claim 9 , wherein, when executed, the instructions cause the apparatus to perform operations comprising: sending first information to the second communication apparatus at a location of a first physical sidelink shared channel (PSSCH) resource, wherein the location of the first PSSCH resource is on a first SCC, and the first SCC is any one of the at least one SCC; and receiving hybrid automatic repeat request (HARQ) feedback information of the first information at a location of a first physical sidelink feedback channel (PSFCH) resource, wherein the location of the first PSFCH resource is determined based on the location of the first PSSCH resource, and the location of the first PSFCH resource is on the first SCC.
  12. 12 . The communication apparatus according to claim 9 , wherein the operations further comprise: sending second information to the second communication apparatus at a location of a second physical sidelink shared channel (PSSCH) resource, wherein the location of the second PSSCH resource is on a second SCC, and the second SCC is any one of the at least one SCC; determining a location of a second physical sidelink feedback channel (PSFCH) resource, wherein the location of the second PSFCH resource is on the PCC; and receiving hybrid automatic repeat request (HARQ) feedback information of the second information at the location of the second PSFCH resource.
  13. 13 . The communication apparatus according to claim 12 , wherein the information about the at least one SL carrier comprises an index of the second SCC and an identifier of a resource pool in which the second PSSCH is located.
  14. 14 . The communication apparatus according to claim 13 , wherein the determining the location of the second PSFCH resource comprises: determining the location of the second PSFCH resource based on at least one of the location of the second PSSCH resource, the index of the second SCC, or the identifier of the resource pool in which the second PSSCH is located; or determining the location of the second PSFCH resource based on a location of a physical sidelink control channel (PSCCH) resource, wherein the PSCCH resource carries sidelink control information (SCI) indicating the location of the second PSSCH resource, and the location of the PSCCH resource is on the PCC.
  15. 15 . The communication apparatus according to claim 14 , wherein the PSCCH resource and the second PSFCH resource are in a same resource pool.
  16. 16 . The communication apparatus according to claim 9 , wherein the operations further comprise: determining that a period of time for switching between a first frequency band and a second frequency band is a first switch time, wherein the first frequency band and the second frequency band are frequency bands of the PCC and a third SCC respectively, and the third SCC is any one of the at least one SCC; receiving a fourth message sent by the second communication apparatus, wherein the fourth message comprises a second switch time, and the second switch time is a period of time for the second communication apparatus to switch between the first frequency band and the second frequency band; and determining that a time interval is not less than a larger value of the first switch time and the second switch time, wherein the time interval is a time interval between an end time point of a first resource and a start time point of a second resource, the first resource belongs to the first frequency band, the second resource belongs to the second frequency band, and a time sequence of the first resource is before a time sequence of the second resource.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2020/132887, filed on Nov. 30, 2020, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD This application relates to the communication field, and more specifically, to a sidelink carrier management method and apparatus, and a system in the communication field. BACKGROUND In a wireless communication system, two communication apparatuses may perform data communication with each other by using a network, or may directly communicate with each other by using a sidelink (SL) carrier without using a network device. A typical application scenario of SL communication is vehicle-to-everything (V2X). In the V2X, each vehicle is a communication apparatus, and data may be directly transmitted between two vehicles by using an SL without using the network. This can effectively reduce a communication delay. Currently, communication between communication apparatuses supports single SL carrier communication, that is, one communication apparatus can send data to another communication apparatus by using only one SL carrier. However, a rate supported by a single carrier has an upper limit, and transmission efficiency is low. Therefore, a multi-carrier communication solution is introduced in the communication field to improve a data transmission rate. In a long term evolution (LTE) system, the V2X performs multi-carrier communication through SL carrier aggregation (CA). However, the LTE system supports only broadcast communication on the SL carrier. Therefore, an intra-carrier closed-loop design is used to be compatible with a communication apparatus of an earlier version. Therefore, SL multi-carrier communication in the LTE system does not support cross-carrier scheduling, that is, transmission on each carrier of the SL is performed independently. For example, user equipment (UE) 1 and UE 2 perform the multi-carrier communication by using an SL carrier (CC) 1 and an SL CC 2. A location of data on the SL CC 1 is indicated by sidelink control information (SCI) on the SL CC 1, and a location of data on the SL CC 2 is indicated by SCI on the SL CC 2. The UE needs to monitor a transmission channel on each carrier to know all possible locations of data. However, a new radio (NR) system supports unicast communication on the SL carrier. If the intra-carrier closed-loop design is still used, transmission efficiency is low. In addition, because a base station cannot sense a communication status between communication apparatuses, the base station cannot accurately manage the SL carrier in real time, and this affects transmission efficiency between the communication apparatuses. Therefore, for SL unicast communication, how to implement timely and effective SL carrier management and how to improve the transmission efficiency between the communication apparatuses are urgent problems to be resolved. SUMMARY This application provides a sidelink carrier management method and apparatus, and a system, to implement instant and effective management of an SL carrier, and this improves SL carrier communication efficiency and a system capacity. According to a first aspect, a sidelink carrier management method is provided. The method is performed by a first communication apparatus, and the first communication apparatus may be, for example, transmitting end user equipment (UE) in a unicast connection. The method includes: The first communication apparatus obtains configuration information of a plurality of sidelink SL carriers. The first communication apparatus determines at least one SL carrier from the plurality of SL carriers. The first communication apparatus sends a first message to a second communication apparatus, where the first message includes information about the at least one SL carrier. According to the foregoing technical solutions, the first communication apparatus first obtains an available SL resource, then determines the at least one SL carrier from the SL resource as a communication carrier, and then indicates the at least one SL carrier to the second communication apparatus. The second communication apparatus is a peer communication apparatus of the first communication apparatus in the unicast connection. Because the first communication apparatus may directly sense a link status of the unicast connection between the first communication apparatus and the second communication apparatus, it is more timely and effective if the first communication apparatus manages an SL carrier of the unicast connection, and this helps improve SL carrier communication efficiency and a system capacity. Optionally, the configuration information of the plurality of SL carriers includes at least one of carrier frequency information, resource pool configuration information, a subcarrier spacing, bandwidth, and synchronization configuration information of the plurality of SL carriers. Optionally, that the fi