Method in which user equipment performs random access in a carrier aggregation mobile communication system
First Claim
1. A method for performing a random access procedure to a base station at a User Equipment (UE) in a mobile communication system using carrier aggregation in which communication is performed using a plurality of component carriers, the method comprising:
- transmitting a first random access preamble to the base station through a first uplink component carrier (UL CC) from among a plurality of UL CCs;
receiving a first random access response message including a backoff indicator as a response to the first random access preamble through a first downlink component carrier (DL CC) corresponding to the first UL CC;
applying a backoff period to the first UL CC in consideration of the backoff indicator received through the first random access response message; and
transmitting a second random access preamble to the base station through a second UL CC to which a backoff period is not applied from among the plurality of UL CCs even during the backoff period of the first UL CC.
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Abstract
The present document relates to a method in which user equipment carries out a process for random access to a base station in a carrier aggregation mobile communication system which performs communications using a plurality of component carriers (CCs), and to a terminal device for the method. The user equipment separately manages back-off operations for each of the CCs, and performs a random access preamble transmission using the relevant CC if another usable CC exists, even when a back-off period is being applied to a specific CC, to carry out a random access process in an efficient manner in a carrier aggregation mobile communication system.
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Citations
10 Claims
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1. A method for performing a random access procedure to a base station at a User Equipment (UE) in a mobile communication system using carrier aggregation in which communication is performed using a plurality of component carriers, the method comprising:
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transmitting a first random access preamble to the base station through a first uplink component carrier (UL CC) from among a plurality of UL CCs; receiving a first random access response message including a backoff indicator as a response to the first random access preamble through a first downlink component carrier (DL CC) corresponding to the first UL CC; applying a backoff period to the first UL CC in consideration of the backoff indicator received through the first random access response message; and transmitting a second random access preamble to the base station through a second UL CC to which a backoff period is not applied from among the plurality of UL CCs even during the backoff period of the first UL CC. - View Dependent Claims (2, 3, 4, 5)
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6. A user equipment (UE) performing a random access procedure to a base station in a mobile communication system using carrier aggregation in which communication is performed using a plurality of component carriers, the UE comprising:
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an antenna; and a processor, the processor configured to; transmit a first random access preamble to the base station through a first uplink component carrier (UL CC) from among a plurality of UL CCs; receive a first random access response message including a backoff indicator as a response to the first random access preamble through a first downlink component carrier (DL CC) corresponding to the first UL CC; apply a backoff period to the first UL CC in consideration of the backoff indicator received through the first random access response message; and transmit a second random access preamble to the base station through a second UL CC to which a backoff period is not applied from among the plurality of UL CCs even during the backoff period of the first UL CC. - View Dependent Claims (7, 8, 9, 10)
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Specification