METHOD AND APPARATUS FOR RANDOM ACCESS IN A WIRELESS COMMUNICATION SYSTEM
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Abstract
The present invention relates to a method and to an apparatus for random access in a wireless communication system to which carrier aggregation is applied. According to one aspect of the present invention, a method in which a base station supports random access of a terminal in a wireless communication system that supports carrier aggregation, comprises a step in which the base station allocates, to the terminal, a dedicated PRACH preamble for a second random access in an uplink component carrier (hereinafter, referred to as UL CC) which is additionally allocated or the configuration of which is changed after a first random access, and receives the dedicated PRACH preamble from the terminal.
77 Citations
36 Claims
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1-20. -20. (canceled)
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21. A method of supporting random access of a user equipment (UE) in a base station of a wireless communication system supporting carrier aggregation, the method comprising:
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assigning, to the UE, a dedicated physical random access channel (PRACH) preamble for second random access on a uplink component carrier (UL CC) which is additionally assigned or reconfigured after first random access; and receiving the dedicated PRACH preamble from the UE, wherein, if a plurality of UL CCs is additionally assigned or reconfigured after the first random access, the assigning includes dividing the plurality of UL CCs into UL CC groups such that UL CCs using the same timing advance belong to the same group and assigning the dedicated PRACH preamble for the second random access in the UL CC group to the UE. - View Dependent Claims (22, 23, 24)
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25. A random access method in a user equipment (UE) of a wireless communication system supporting carrier aggregation, the random access method comprising:
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at a base station, assigning a dedicated physical random access channel (PRACH) preamble for second random access on a uplink component carrier (UL CC) which is additionally assigned or reconfigured after first random access; and transmitting the dedicated PRACH preamble to the base station, wherein, if a plurality of UL CCs is additionally assigned or reconfigured after the first random access, the plurality of UL CCs is divided into UL CC groups such that UL CCs using the same timing advance belong to the same group, and the dedicated PRACH preamble for the second random access in the UL CC group is assigned in the assigning. - View Dependent Claims (26, 27, 28)
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29. A base station of a wireless communication system supporting carrier aggregation, comprising:
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a processor configured to assign, to a user equipment (UE), a dedicated physical random access channel (PRACH) preamble for second random access on a uplink component carrier (UL CC) which is additionally assigned or reconfigured after first random access; a transmission module configured to transmit information about the dedicated PRACH to the UE; and a reception module configured to receive the dedicated PRACH preamble from the UE, wherein, if a plurality of UL CCs is additionally assigned or reconfigured after the first random access, the processor divides the plurality of UL CCs into UL CC groups such that UL CCs using the same timing advance belong to the same group and assigns the dedicated PRACH preamble for the second random access in the UL CC group to the UE. - View Dependent Claims (30, 31, 32)
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33. A user equipment (UE) of a wireless communication system supporting carrier aggregation, comprising:
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a reception module configured to receive, from a base station, information about a dedicated physical random access channel (PRACH) preamble for second random access on a uplink component carrier (UL CC) which is additionally assigned or reconfigured after first random access; and a transmission module configured to transmit the dedicated PRACH preamble to the base station, wherein, if a plurality of UL CCs is additionally assigned or reconfigured after the first random access, the plurality of UL CCs is divided into UL CC groups such that UL CCs using the same timing advance belong to the same group, and the dedicated PRACH preamble is used for the second random access in the UL CC group. - View Dependent Claims (34, 35, 36)
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Specification