Patent ID: 9155002
Filing Date: 2015-10-06
Classification: H04W

Abstract:
1. A method for performing handover during a direct communication between a first user equipment (UE) and a second UE in a wireless communication system supporting the direct communication, the method comprising: sensing, by the first UE, a handover state in consideration of link quality with the second UE while performing communication with the second device; measuring, by the first UE, channel quality for a candidate group of neighboring devices using a reference signal transmitted from the candidate group of neighboring devices; selecting, by the first UE, a relay device from the candidate group of neighboring devices; transmitting, by the first UE to the relay device, a handover request message in order to start handover to the relay device; receiving, by the first UE from the relay UE, a handover complete message indicating that resource allocation has been completed; and performing, by the first UE, communication with the second UE via the relay device using resources allocated by the relay device, wherein selecting the relay device includes: