Patent ID: 9706340
Date: 2017-07-11
CPC Classifications: H04L,H04W

Claim:
1. A method for performing Proximity Services (ProSe) by a first Internet protocol Multimedia Subsystem (IMS) User Equipment (UE) in a wireless communication system, the method comprising: transmitting a presence service subscription request message comprising a condition to transmit presence information of a second IMS UE, wherein the presence information indicates communication ability and willingness of a potential communication peer; receiving the presence information of the second IMS UE when the condition is met, wherein the condition is met when the second IMS UE enters a range in which direct communication with the first IMS UE is possible; transmitting, in response to the presence information of the second IMS UE, a first Session Initiation Protocol (SIP) message comprising ProSe communication request information and ProSe capability information to the second IMS UE via a network node, wherein the ProSe capability information indicates whether ProSe communication is available per bearer types, and the bearer types comprise a circuit switched bearer, a packet switched bearer, and an emergency bearer; and receiving a second SIP message comprising ProSe communication response information from the second IMS UE via the network node, wherein the first IMS UE and the second IMS UE communicate to each other through a direct data path without going via an EPC (Evolved Packet Core) in the direct communication, wherein the ProSe capability information includes multi-hop communication information indicating whether the ProSe communication is available in a multi-hop manner, and wherein the multi-hop communication information indicates whether the first IMS UE is capable of serving as an end node on a multi-hop path and whether the first IMS UE is capable of serving as a relay node on the multi-hop path.