User equipment and method for sidelink communication

Abstract

A method for sidelink communication is provided. The method is applied to a peer-receiving UE (peer-Rx UE) in a sidelink communication. The method includes the steps of decoding a first sidelink control information (SCI) in a first time slot from a peer-transmitting UE (peer-Tx UE) successfully, wherein the first SCI provides a resource allocation information that indicates one or more time slots allocated for one or more second SCIs to be transmitted by the peer-Tx UE; performing SCI decoding in the one or more time slots allocated for the one or more second SCIs; and transmitting assistance information when a trigger condition is met, wherein the trigger condition is based on the performing SCI decoding in the one or more time slots allocated for the one or more second SCIs.

1 . A method for sidelink communication, wherein the method is applied to a peer-receiving UE (peer-Rx UE) in a sidelink communication, comprising:
 decoding a first sidelink control information (SCI) in a first time slot from a peer-transmitting UE (peer-Tx UE) successfully, wherein the first SCI provides a resource allocation information that indicates one or more time slots allocated for one or more second SCIs to be transmitted by the peer-Tx UE;   performing SCI decoding in the one or more time slots allocated for the one or more second SCIs; and   transmitting assistance information when a trigger condition is met, wherein the trigger condition is based on the performing SCI decoding in the one or more time slots allocated for the one or more second SCIs.   
     
     
         2 . The method of  claim 1 , wherein the trigger condition comprises:
 in the one or more time slots allocated for the one or more second SCIs, at least one SCI is successfully decoded and the successfully decoded SCI does not belong to the peer-Tx UE.   
     
     
         3 . The method of  claim 2 , wherein the trigger condition further comprises:
 a first priority associated with the first SCI is not higher than a second priority associated with the successfully decoded SCI.   
     
     
         4 . The method of  claim 2 , wherein the trigger condition further comprises:
 a first priority associated with the first SCI is higher than a second priority associated with the successfully decoded SCI.   
     
     
         5 . The method of  claim 1 , wherein the trigger condition comprises:
 in the one or more time slots allocated for the one or more second SCIs, the peer-Rx UE cannot successfully decode the one or more second SCIs.   
     
     
         6 . The method of  claim 1 , wherein the resource allocation information comprises a periodic reservation interval for periodic reservations of the one or more second SCIs in multiple periodic slots, and the periodic reservation interval is a time gap between the first SCI and the second SCI or a time gap between two successive second SCIs. 
     
     
         7 . The method of  claim 6 , wherein the trigger condition further comprises:
 the second SCIs cannot be decoded successfully at N successive periodic slots, where N is a positive integer.   
     
     
         8 . The method of  claim 1 , wherein the peer-Rx UE transmits the assistance information to the peer-Tx UE through a broadcast, unicast or groupcast channel. 
     
     
         9 . The method of  claim 1 , wherein the assistance information is transmitted to the peer-Tx UE through a first part of a SCI transmitted to the peer-Tx UE, a second part of the SCI transmitted to the peer-Tx UE, a physical sidelink feedback shared channel (PSFCH), or a data channel. 
     
     
         10 . User equipment (UE) for sidelink communication, wherein the UE is a peer-receiving UE (peer-Rx UE) in a sidelink communication, comprising:
 a processor, decoding a first SCI in a first time slot from a peer-Tx UE successfully, wherein the first SCI provides a resource allocation information that indicates one or more time slots allocated for one or more second SCIs to be transmitted by the peer-Tx UE, and performing SCI decoding in the one or more time slots allocated for the one or more second SCIs; and   a radio frequency (RF) signal processing device, transmitting assistance information when a trigger condition is met, wherein the trigger condition is based on the performing SCI decoding in the one or more time slots allocated for the one or more second SCIs.   
     
     
         11 . The UE of  claim 10 , wherein the trigger condition comprises that in the one or more time slots allocated for the one or more second SCIs, at least one SCI is successfully decoded and the successfully decoded SCI does not belong to the peer-Tx UE. 
     
     
         12 . The UE of  claim 11 , wherein the trigger condition further comprises that a first priority associated with the first SCI is not higher than a second priority associated with the successfully decoded SCI. 
     
     
         13 . The UE of  claim 11 , wherein the trigger condition further comprises that a first priority associated with the first SCI is higher than a second priority associated with the successfully decoded SCI. 
     
     
         14 . The UE of  claim 10 , wherein the trigger condition further comprises that in the one or more time slots allocated for the one or more second SCIs, the peer-Rx UE cannot successfully decode the one or more second SCIs. 
     
     
         15 . The UE of  claim 10 , wherein the resource allocation information comprises a periodic reservation interval for periodic reservations of the one or more second SCIs in multiple periodic slots, and the periodic reservation interval is a time gap between the first SCI and the second SCI or a time gap between two successive second SCIs. 
     
     
         16 . The UE of  claim 15 , wherein the trigger condition further comprises the second SCIs cannot be decoded successfully at N successive periodic slots, wherein N is a positive integer. 
     
     
         17 . The UE of  claim 10 , wherein the peer-Rx UE transmits the assistance information to the peer-Tx UE through a broadcast, unicast or group unit channel. 
     
     
         18 . The UE of  claim 10 , wherein the assistance information is transmitted to the peer-Tx UE through a first part of a SCI transmitted to the peer-Tx UE, a second part of the SCI transmitted to the peer-Tx UE, a physical sidelink feedback shared channel (PSFCH) or a data channel.