Method and device for random access in wireless communication system supporting multi-carrier wave
AssigneeLG Electronics Inc.
InventorsSungjun Park, Sungduck Chun, Sunghoon Jung, Seungjune Yi, Youngdae Lee
Life of this patent
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Abstract
Provided are a method and device for random access in a wireless communication system supporting multi-carrier wave. The method includes: transmitting a random access preamble on the first secondary serving cell (SCell) to a base station, receiving a random access response from the base station, transmitting uplink data to the base station by using an uplink grant included in the random access response, and receiving a contention resolution message from the base station on the serving cell on which scheduling information on the first SCell is transmitted.
Claims7
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.
A user equipment for performing a random access procedure on a first secondary serving cell (SCell) the user equipment comprising:
- a reception module configured to receive a downlink signal from a base station;
- a transmission module configured to transmit an uplink signal to the base station;
- and
- a processor configured to control the user equipment that includes the reception module and the transmission module,
- wherein a plurality of serving cells are configured for the user equipment, and
- wherein the processor is further configured to:
- transmit a random access preamble on the first SCell to the base station through the transmission module,
- receive a random access response on a primary serving cell (PCell) from the base station through the reception module,
- transmit uplink data to the base station on the PCell by using an uplink grant included in the random access response through the transmission module, and
- receive a contention resolution message from the base station on the first SCell, on which scheduling information on the first SCell is transmitted, through the reception module,
- 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.
Dependencies are inferred from the claim text.