Apparatus and method for performing uplink synchronization wireless communication system
First Claim
1. A user equipment (UE) configured for performing an uplink synchronization on first and second serving cells in a wireless communication system, the UE comprising:
- wireless communication circuitry; and
one or more processors coupled to the wireless communication circuitry, wherein the one or more processors are configured to cause the UE to;
receive resource control (RRC) configuration for carrier aggregation of the first and second serving cells;
receive resource control (RRC) configuration for an extended physical downlink control channel (EPDCCH) for the second serving cell from a base station (B S), wherein the RRC configuration configures the UE with a search space for EPDCCH reception on the second serving cell;
receive, in a first subframe containing a first control region and a first data region, an initiation indicator of a first non-contention random access procedure to obtain uplink timing on the first serving cell via the PDCCH in the first control region; and
receive, in a second subframe containing a second control region and a second data region, an initiation indicator of a second non-contention random access procedure to obtain uplink timing on the second serving cell via only the EPDCCH in the second data region, wherein the UE does not receive the PDCCH in the second control region.
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Abstract
This specification relates to an apparatus and method for performing random access in a wireless communication system. This specification discloses a mobile station, including a reception unit for receiving TAG configuration information on which at least one serving cell configured in the mobile station is classified as a Timing Alignment Group (TAG) from a base station and a transmission unit for transmitting a random access preamble to the base station on one representative serving cell within the TAG. In accordance with this specification, a procedure of obtaining a TAV for a serving cell in order to secure and maintain uplink timing synchronization becomes clear, the time taken to obtain uplink synchronization for a serving cell may be reduced, and overhead due to excessive random access attempts may be reduced by obtaining a TAV for a plurality of serving cells through one random access procedure.
13 Citations
20 Claims
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1. A user equipment (UE) configured for performing an uplink synchronization on first and second serving cells in a wireless communication system, the UE comprising:
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wireless communication circuitry; and one or more processors coupled to the wireless communication circuitry, wherein the one or more processors are configured to cause the UE to; receive resource control (RRC) configuration for carrier aggregation of the first and second serving cells; receive resource control (RRC) configuration for an extended physical downlink control channel (EPDCCH) for the second serving cell from a base station (B S), wherein the RRC configuration configures the UE with a search space for EPDCCH reception on the second serving cell; receive, in a first subframe containing a first control region and a first data region, an initiation indicator of a first non-contention random access procedure to obtain uplink timing on the first serving cell via the PDCCH in the first control region; and receive, in a second subframe containing a second control region and a second data region, an initiation indicator of a second non-contention random access procedure to obtain uplink timing on the second serving cell via only the EPDCCH in the second data region, wherein the UE does not receive the PDCCH in the second control region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for a user equipment (UE) performing an uplink synchronization on first and second serving cells in a wireless communication system, comprising:
- by the UE;
receiving resource control (RRC) configuration for carrier aggregation of the first and second serving cells; receiving resource control (RRC) configuration for an extended physical downlink control channel (EPDCCH) for the second serving cell from a base station (BS), wherein the RRC configuration configures the UE with a search space for EPDCCH reception on the second serving cell; receiving, in a first subframe containing a first control region and a first data region, an initiation indicator of a first non-contention random access procedure to obtain uplink timing on the first serving cell via the PDCCH in the first control region; and receiving, in a second subframe containing a second control region and a second data region, an initiation indicator of a second non-contention random access procedure to obtain uplink timing on the second serving cell via only the EPDCCH in the second data region, wherein the UE does not receive the PDCCH in the second control region. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- by the UE;
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15. An apparatus comprising:
one or more processors, configured to cause a user equipment (UE) to; receive resource control (RRC) configuration for carrier aggregation of first and second serving cells; receive resource control (RRC) configuration for an extended physical downlink control channel (EPDCCH) for the second serving cell from a base station (BS), wherein the RRC configuration configures the UE with a search space for EPDCCH reception on the second serving cell; receive, in a first subframe containing a first control region and a first data region, an initiation indicator of a first non-contention random access procedure to obtain uplink timing on the first serving cell via the PDCCH in the first control region; and receive, in a second subframe containing a second control region and a second data region, an initiation indicator of a second non-contention random access procedure to obtain uplink timing on the second serving cell via only the EPDCCH in the second data region, wherein the UE does not receive the PDCCH in the second control region. - View Dependent Claims (16, 17, 18, 19, 20)
Specification