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EP-4738741-A2 - METHOD AND DEVICE FOR FLEXIBLE FEEDBACK IN V2X TRANSMISSION, AND USER EQUIPMENT

EP4738741A2EP 4738741 A2EP4738741 A2EP 4738741A2EP-4738741-A2

Abstract

A method and a device for flexible feedback in vehicle-to-everything (V2X) transmission, and a user equipment are provided. The method implemented in a receiving user equipment (UE) includes the following. A feedback requirement indicated by a transmitting UE is received during V2X transmission. A feedback resource is determined according to the feedback requirement. Feedback information is sent to the transmitting UE on the feedback resource according to the feedback requirement. The method implemented in a transmitting UE includes the following. A feedback requirement is indicated to a receiving UE during V2X transmission. Feedback information sent by the receiving UE on a feedback resource according to the feedback requirement is received, where the feedback resource is determined by the receiving UE according to the feedback requirement. According to this application, it is possible to implement flexible feedback while a service requirement of the transmitting UE is met.

Inventors

  • DENG, Yun
  • HAN, LIFENG
  • GU, XIANGXIN

Assignees

  • Spreadtrum Communications (Shanghai) Co., Ltd.

Dates

Publication Date
20260506
Application Date
20190904

Claims (13)

  1. A method for flexible feedback in vehicle-to-everything, V2X, transmission, implemented in a receiving user equipment, UE, and comprising: receiving a requirement for feedback indicated by a transmitting UE through sidelink control information, SCI; selecting a feedback resource from a feedback resource pool, wherein the feedback resource pool is obtained through system information or is a pre-configured feedback resource pool; and sending feedback information to the transmitting UE on the feedback resource according to the requirement for feedback, wherein the feedback information is to be indicated by the transmitting UE to a serving base station when the transmitting UE is in connected status.
  2. The method of claim 1, wherein the requirement for feedback comprises one or more of the following parameters: feedback type, feedback delay, feedback reliability, feedback at the same frequency or not, whether the feedback information can be embedded into V2X data, and a time slot in which feedback is not allowed.
  3. The method of claim 2, wherein the requirement for feedback is in the form of an index and different indexes correspond to different requirements for feedback.
  4. The method of claim 1, further comprising: sending a feedback resource acquisition request to the serving base station when the receiving UE is in connected status and receiving the feedback resource configured by the serving base station according to the requirement for feedback, wherein the requirement for feedback is indicated in the feedback resource acquisition request.
  5. The method of claim 1, wherein the feedback resource pool is allocated by a serving cell where the receiving UE is located, or the feedback resource pool is set by a pre-configured parameter when the receiving UE is outside the network coverage.
  6. A method for flexible feedback in vehicle-to-everything, V2X, transmission, implemented in a transmitting user equipment, UE, and comprising: indicating a requirement for feedback to a receiving UE through sidelink control information, SCI; receiving feedback information sent by the receiving UE on a feedback resource according to the requirement for feedback, wherein the feedback resource is selected by the receiving UE from a feedback resource pool, and the feedback resource pool is obtained through system information or is a pre-configured feedback resource pool; and indicating the feedback information to a serving base station when the transmitting UE is in connected status.
  7. The method of claim 6, wherein indicating the feedback information to the serving base station comprises: indicating negative acknowledgement, NACK, information to the serving base station; or indicating the feedback information to the serving base station through a buffer status report.
  8. A receiving user equipment, UE, comprising: at least one processor; a transceiver; and a memory storing instructions which, when executed by the at least one processor, cause the at least one processor to: receive, via the transceiver, a requirement for feedback indicated by a transmitting UE through sidelink control information, SCI; select a feedback resource from a feedback resource pool, wherein the feedback resource pool is obtained through system information or is a pre-configured feedback resource pool; and send, via the transceiver, feedback information to the transmitting UE on the feedback resource according to the requirement for feedback, wherein the feedback information is to be indicated by the transmitting UE to a serving base station when the transmitting UE is in connected status.
  9. The receiving UE of claim 8, wherein the requirement for feedback comprises one or more of the following parameters: feedback type, feedback delay, feedback reliability, feedback at the same frequency or not, whether the feedback information can be embedded into V2X data, and a time slot in which feedback is not allowed.
  10. The receiving UE of claim 9, wherein the requirement for feedback is in the form of an index and different indexes correspond to different requirements for feedback.
  11. The receiving UE of claim 8, wherein the at least one processor is further configured to: send, via the transceiver, a feedback resource acquisition request to the serving base station when the receiving UE is in connected status and receive, via the transceiver, the feedback resource configured by the serving base station according to the requirement for feedback, wherein the requirement for feedback is indicated in the feedback resource acquisition request.
  12. The receiving UE of claim 8, wherein the feedback resource pool is allocated by a serving cell where the receiving UE is located.
  13. The receiving UE of claim 8, wherein the feedback resource pool is set by a pre-configured parameter when the receiving UE is outside the network coverage.

Description

TECHNICAL FIELD This disclosure relates to the technical field of wireless communication, and particular to a method and a device for flexible feedback in vehicle-to-everything (V2X) transmission, and a user equipment. BACKGROUND In Release 12, ProSe (proximity-based service) direct communication is introduced in LTE (long term evolution). UE (user equipment) A and UE B (or multiple UEs) can perform direct communication through the PC5 interface. The PC5 interface is the direct interface between UEs. There are two modes for resource allocation. One is the scheduled resource allocation, which is configured by a base station through dedicated signaling. The other is the autonomous resource selection. In this case, the base station can provide a resource pool for direct communication to the UE through system information blocks or RRC (radio resource control) signaling, so that the UE can select a resource(s) for direct communication from the resource pool. If the transmitter UE is not within the coverage of the network (i.e., the network coverage), the UE adopts the autonomous resource selection to select a transmission resource for direct communication from a pre-configured resource pool. Based on direct communication, 3GPP (3rd generation partnership project) also supports vehicle-to-everything (V2X). Within the network coverage, a UE can send V2X messages to multiple UEs. It is to be noted, both the receiving UE and the transmitting UE may not be within the network coverage or some UEs may be within the network coverage. Currently, 3GPP is studying introduction of V2X to 5G (i.e., new radio, NR). This is because 5G can provide greater bandwidth and lower latency, and can better meet a service requirement of V2X. Furthermore, 3GPP has also agreed that NR V2X can adopt unicast, groupcast, or broadcast to transmit V2X services. When the transmitting UE adopts unicast or groupcast, feedback can be introduced. However, how to perform V2X feedback according to a service requirement of the transmitting UE is a problem to be solved. SUMMARY A method and a device for flexible feedback in vehicle-to-everything (V2X) transmission, and a user equipment are provided, to implement flexible feedback while a service requirement of a transmitting UE is met. According to a first aspect, a method for flexible feedback in V2X transmission is provided. The method is implemented in a receiving UE and includes the following. A feedback requirement indicated by a transmitting UE is received during V2X transmission. A feedback resource is determined according to the feedback requirement. Feedback information is sent to the transmitting UE on the feedback resource according to the feedback requirement. In at least one implementation, the feedback requirement indicated by the transmitting UE is received as follows. The feedback requirement indicated by the transmitting UE is received through SCI (sidelink control information). Alternatively, the feedback requirement indicated by the transmitting UE is received through a MAC (medium access control) header carried by a PSSCH (physical sidelink shared channel) during transmission of V2X data. In at least one implementation, the feedback requirement includes one or more of the following parameters: feedback type, feedback delay, feedback reliability, feed back at the same frequency or not, whether the feedback information can be embedded into V2X data, and time slot information in which feedback is not allowed. In at least one implementation, the feedback requirement is in the form of an index and different indexes correspond to different feedback requirements. In at least one implementation, the feedback resource is determined according to the feedback requirement as follows. The feedback resource is selected from a feedback resource pool according to the feedback requirement. Alternatively, a feedback resource acquisition request is sent to a base station when the receiving UE is in connected status and the feedback resource configured by the base station according to the feedback requirement is received, where the feedback requirement is indicated in the feedback resource acquisition request. In at least one implementation, the feedback resource pool is allocated by a serving cell where the receiving UE is located, or the feedback resource pool is set by a pre-configured parameter when the receiving UE is outside the network coverage. According to a second aspect, a method for flexible feedback in V2X transmission is provided. The method is implemented in a transmitting UE and includes the following. A feedback requirement is indicated to a receiving UE during V2X transmission. Feedback information sent by the receiving UE on a feedback resource according to the feedback requirement is received, where the feedback resource is determined by the receiving UE according to the feedback requirement. In at least one implementation, the method further includes the following, after the feedba