Method for a user terminal to random access a carrier aggregation mobile communication system
First Claim
1. A method for performing a random access procedure by a user equipment (UE) configured with a plurality of downlink component carriers (DL CCs) and a plurality of uplink component carriers (UL CCs), the method comprising:
- transmitting a random access preamble through one of the plurality of UL CCs;
receiving a random access response message in response to the random access preamble;
transmitting an identifier of the UE; and
determining whether the random access procedure is successful according to whether a contention resolution message is received before a contention resolution timer expires,wherein when physical downlink control channel (PDCCH) information is received through a first DL CC, and the PDCCH information is indicated by the same identifier transmitted by the UE, the UE considers the PDCCH information as the contention resolution message, andwherein when the PDCCH information is received through another DL CC different from the first DL CC, the UE does not consider the PDCCH information as the contention resolution message even if the PDCCH information is indicated by the same identifier transmitted by the UE.
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Accused Products
Abstract
A method for random access to a base station by a user equipment (UE) in a mobile communication system using carrier aggregation in which communication is conducted over a plurality of component carriers, and a terminal for the method are disclosed. When the UE performs a contention-based random access procedure in the mobile communication system to which CA technology is applied, the UE considers an uplink grant signal as a contention resolution message when receiving the uplink grant signal from a eNB only when the uplink grant signal is received through a downlink CC corresponding to an uplink CC used to transmit a random access preamble or a third message, to thereby prevent contention resolution from being erroneously ended.
18 Citations
13 Claims
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1. A method for performing a random access procedure by a user equipment (UE) configured with a plurality of downlink component carriers (DL CCs) and a plurality of uplink component carriers (UL CCs), the method comprising:
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transmitting a random access preamble through one of the plurality of UL CCs; receiving a random access response message in response to the random access preamble; transmitting an identifier of the UE; and determining whether the random access procedure is successful according to whether a contention resolution message is received before a contention resolution timer expires, wherein when physical downlink control channel (PDCCH) information is received through a first DL CC, and the PDCCH information is indicated by the same identifier transmitted by the UE, the UE considers the PDCCH information as the contention resolution message, and wherein when the PDCCH information is received through another DL CC different from the first DL CC, the UE does not consider the PDCCH information as the contention resolution message even if the PDCCH information is indicated by the same identifier transmitted by the UE. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-transitory computer readable medium recorded thereon a program for executing by a processor of a user equipment (UE) the following method:
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transmitting a random access preamble through one of a plurality of uplink component carriers (UL CCs); receiving a random access response message in response to the random access preamble; transmitting an identifier of the UE; and determining whether the random access procedure is successful according to whether a contention resolution message is received before a contention resolution timer expires, wherein when physical downlink control channel (PDCCH) information is received through a first downlink component carriers (DL CC), and the PDCCH information is indicated by the same identifier transmitted by the UE, the UE considers the PDCCH information as the contention resolution message, and wherein when the PDCCH information is received through another DL CC different from the first DL CC, the UE does not consider the PDCCH information as the contention resolution message even if the PDCCH information is indicated by the same identifier transmitted by the UE.
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8. A user equipment (UE) configured with a plurality of downlink component carriers (DL CCs) and a plurality of uplink component carriers (UL CCs), the UE comprising:
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a transmitter to transmit a random access preamble through one of the plurality of UL CCs, and to transmit an identifier of the UE; a receiver to receive a random access response message in response to the random access preamble; and a processor to determine whether the random access procedure is successful according to whether a contention resolution message is received before a contention resolution timer expires, wherein when physical downlink control channel (PDCCH) information is received through a first DL CC, and the PDCCH information is indicated by the same identifier transmitted by the UE, the processor considers the PDCCH information as the contention resolution message, and wherein when the PDCCH information is received through another DL CC different from the first DL CC, the processor does not consider the PDCCH information as the contention resolution message even if the PDCCH information is indicated by the same identifier transmitted by the UE. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification