Patent ID: 9749982
Date: 2017-08-29
CPC Classifications: H04W

Claim:
1. A method for updating a tracking area in a wireless communication system, the method comprising: determining, by a mobile relay node, to trigger a tracking area update (TAU) procedure when the mobile relay node moves to a new tracking area that is not in a list of tracking area identities (TAIs); transmitting, by the mobile relay node, in response to the determining to trigger the TAU procedure, a tracking area change message to a plurality of user equipments (UEs) served by the mobile relay node, the tracking area change message indicating that a tracking area in which the mobile relay node is located is changed; receiving, by the mobile relay node, a tracking area change response message from the plurality of UEs as a response to the tracking area change message; upon receiving the tracking area change response message from the plurality of UEs, generating and transmitting, by the mobile relay node in response to the determining to trigger the TAU procedure, a TAU request message including a list of the plurality of UEs to a donor evolved NodeB (DeNB), the TAU request message being generated and transmitted by the mobile relay node on behalf of the plurality of UEs, such that the plurality of UEs do not need to perform the TAU procedure; receiving a TAU accept message from a mobility management entity (MME); and transmitting a TAU complete message to the plurality of UEs, such that the plurality of UEs detect to enter the new tracking area without performing the TAU procedure.