Patent ID: 9629184
Date: 2017-04-18
CPC Classifications: H04L,H04W

Claim:
1. A method for performing a random access procedure with a User Equipment (UE) in a mobile communication system supporting carrier aggregation using a primary carrier and a secondary carrier, the method performed by a Base Station (BS) and comprising: receiving, from the UE through the primary carrier, a first message comprising a random access preamble; transmitting, to the UE through the primary carrier, a second message including first uplink (UL) grant information as a response to the random access preamble; receiving, from the UE through an uplink radio resource corresponding to the first UL grant information, a third message including identity information of the UE; and transmitting, to the UE, a first Physical Downlink Control Channel (PDCCH) on the primary carrier and a second PDCCH on the secondary carrier, both of the first PDCCH and the second PDCCH being indicated by the identity information of the UE, wherein the first PDCCH transmitted through the primary carrier is considered as a contention resolution message for a contention resolution procedure, the contention resolution message being used for indicating the contention resolution procedure is successful, and wherein the second PDCCH transmitted through the secondary carrier is not considered as the contention resolution message for the contention resolution procedure.