Patent ID: 9313807
Filing Date: 2016-04-12
CPC Classification: H04L,H04W

Claim Text:
1. A method for performing a random access procedure on a first secondary serving cell (SCell) in a user equipment comprising a plurality of serving cells, the method comprising: transmitting a random access preamble on the first SCell to a base station; receiving a random access response on a primary serving cell (PCell) from the base station; transmitting uplink data to the base station on the PCell by using an uplink grant included in the random access response; and receiving a contention resolution message from the base station on the first SCell, on which scheduling information on the first SCell is transmitted, wherein the user equipment determines that contention resolution is successful only if physical downlink control channel (PDCCH) transmission is received on the first SCell, on which the scheduling information on the first SCell is transmitted, wherein the user equipment determines that contention resolution is not successful if PDCCH transmission is received on a serving cell other than the first SCell among the plurality of serving cells, wherein an identifier of the user equipment includes a cell-radio network temporary identifier (C-RNTI) or a temporary C-RNTI, and wherein the first SCell belongs to a timing advance group (TAG) that includes SCells only, the SCells being from the base station and from neighboring base stations.