Method and apparatus for supporting one-to-one sidelink communication in a wireless communication system

Abstract

A method and apparatus are disclosed from the perspective of an initiating UE (User Equipment) for establishing a one-to-one sidelink communication with a target UE. In one embodiment, the method includes transmitting a first PC5 signaling used for establishing the one-to-one sidelink communication, wherein the first PC5 signaling includes an identity of the target UE and an identity of a V2X (Vehicle-to-Everything) service.

1 . A method for an initiating UE (User Equipment) to establish a unicast link with a target UE, comprising:
 transmitting a first PC5 signaling to a broadcast address associated with a V2X (Vehicle-to-Everything) service or a V2X application offering the V2X service, wherein the first PC5 signaling includes an application layer identity of the target UE;   receiving a second PC5 signaling from the target UE; and   transmitting one or more V2X messages to the target UE via the unicast link, wherein the unicast link is associated with the first PC5 signaling and the second PC5 signaling.   
     
     
         2 . The method of  claim 1 , wherein the initiating UE is aware of the presence of the target UE via a discovery procedure or a one-to-many sidelink communication. 
     
     
         3 . The method of  claim 1 , wherein the first PC5 signaling includes an identity of a V2X application offering a V2X service. 
     
     
         4 . The method of  claim 1 , wherein the first PC5 signaling includes an application layer identity of the initiating UE. 
     
     
         5 . The method of  claim 1 , wherein the first PC5 signaling includes requested PC5 5QI, QoS (Quality of Service) parameter(s) or QoS profile(s) of a PC5 QoS flow for a V2X application offering a V2X service or the V2X service. 
     
     
         6 . The method of  claim 1 , wherein the second PC5 signaling includes accepted PC5 5QI for a V2X application offering a V2X service or the V2X service. 
     
     
         7 . The method of  claim 1 , wherein the first PC5 signaling is a Direct Communication Request message. 
     
     
         8 . The method of  claim 1 , wherein the second PC5 signaling includes QoS (Quality of Service) parameter(s) for a V2X application offering a V2X service or the V2X service. 
     
     
         9 . The method of  claim 1 , wherein the second PC5 signaling includes QoS (Quality of Service) profile(s) of a PC5 QoS flow for a V2X application offering the V2X service or the V2X service. 
     
     
         10 . The method of  claim 1 , wherein the second PC5 signaling is a Direct Communication Accept message. 
     
     
         11 . An initiating communication device, comprising:
 a control circuit;   a processor installed in the control circuit; and   a memory installed in the control circuit and operatively coupled to the processor;   wherein the processor is configured to execute a program code stored in the memory to:
 transmit a first PC5 signaling to a broadcast address associated with a V2X (Vehicle-to-Everything) service or a V2X application offering the V2X service, wherein the first PC5 signaling includes an application layer identity of a target communication device; 
 receive a second PC5 signaling from the target communication device; and 
 transmit one or more V2X messages to the target communication device via a unicast link associated with the first PC5 signaling and the second PC5 signaling. 
   
     
     
         12 . The initiating communication device of  claim 11 , wherein the initiating communication device is aware of the presence of the target communication device via a discovery procedure or a one-to-many sidelink communication. 
     
     
         13 . The initiating communication device of  claim 11 , wherein the first PC5 signaling includes an identity of a V2X application offering a V2X service. 
     
     
         14 . The initiating communication device of  claim 11 , wherein the first PC5 signaling includes an application layer identity of the initiating communication device. 
     
     
         15 . The initiating communication device of  claim 11 , wherein the first PC5 signaling includes requested PC5 5QI, QoS (Quality of Service) parameter(s) or QoS profile(s) of a PC5 QoS flow for a V2X application offering a V2X service or the V2X service. 
     
     
         16 . The initiating communication device of  claim 11 , wherein the second PC5 signaling includes accepted PC5 5QI for a V2X application offering a V2X service or the V2X service. 
     
     
         17 . The initiating communication device of  claim 11 , wherein the first PC5 signaling is a Direct Communication Request message. 
     
     
         18 . The initiating communication device of  claim 11 , wherein the second PC5 signaling includes QoS (Quality of Service) parameter(s) for a V2X application offering a V2X service or the V2X service. 
     
     
         19 . The initiating communication device of  claim 11 , wherein the second PC5 signaling includes QoS (Quality of Service) profile(s) of a PC5 QoS flow for a V2X application offering a V2X service or the V2X service. 
     
     
         20 . The initiating communication device of  claim 11 , wherein the second PC5 signaling is a Direct Communication Accept message.