Method and apparatus for applying a time alignment timer in a wireless communication system using a carrier aggregation technique
First Claim
1. A method for controlling a timing advance command by a terminal in a wireless communication system, the method comprising:
- receiving a system information block (SIB) including a first timing alignment timer (TAT) from a base station;
receiving a radio resource control (RRC) message including a second TAT from the base station;
transmitting a random access preamble to the base station;
receiving a message including a timing advance command (TAC) and an identity of a timing advance group (TAG) from the base station;
applying the first TAT included in the SIB to a corresponding TAG associated with the identity of the TAG, if the random access preamble is transmitted in idle mode; and
applying the second TAT included in the RRC message to the corresponding TAG associated with the identity of the TAG, if the random access preamble is transmitted in active mode,wherein at least one of the first TAT and the second TAT is used to control how long the terminal considers a cell belonging to the corresponding TAG to be uplink aligned.
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Accused Products
Abstract
Operation of a terminal for determining which time alignment timer is applied to a certain condition when specific timers operate for each carrier-wave group in the event a wireless communication system using carrier aggregation techniques. A terminal performs communication without malfunctions using a timer suitable for a certain condition. The terminal operates the timer by receiving, from a base station, a message including a timing advance command and an index on a timing advance group (TAG), operating the timer for the TAG, the index has a value of 00 when the TAG includes a first cell. A terminal operates a timer by operating a first timer for a TAG including a first cell, operating a second timer upon receipt of a timing advance command for a second TAG that does not include the first cell, and, if the first timer has expired, deeming the second timer to also be expired.
51 Citations
14 Claims
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1. A method for controlling a timing advance command by a terminal in a wireless communication system, the method comprising:
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receiving a system information block (SIB) including a first timing alignment timer (TAT) from a base station; receiving a radio resource control (RRC) message including a second TAT from the base station; transmitting a random access preamble to the base station; receiving a message including a timing advance command (TAC) and an identity of a timing advance group (TAG) from the base station; applying the first TAT included in the SIB to a corresponding TAG associated with the identity of the TAG, if the random access preamble is transmitted in idle mode; and applying the second TAT included in the RRC message to the corresponding TAG associated with the identity of the TAG, if the random access preamble is transmitted in active mode, wherein at least one of the first TAT and the second TAT is used to control how long the terminal considers a cell belonging to the corresponding TAG to be uplink aligned. - View Dependent Claims (2, 5, 7, 8, 9, 10)
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3. A terminal for controlling timing advance command in a wireless communication system, the terminal comprising:
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a transceiver configured to transmit and receive a signal; and a controller configured to; receive a system information block (SIB) including a first timing alignment timer (TAT) from a base station, receive a radio resource control (RRC) message including a second TAT from the base station, transmit a random access preamble to the base station, receive a message including a timing advance command (TAC) and an identity of a timing advance group (TAG) from the base station, apply the first TAT included in the SIB to a corresponding TAG associated with the identity of the TAG, if the random access preamble is transmitted in idle mode, and apply the second TAT included in the RRC message to the corresponding TAG associated with the identity of the TAG, if the random access preamble is transmitted in active mode, wherein at least one of the first TAT and the second TAT is used to control how long the terminal considers a cell belonging to the corresponding TAG to be uplink aligned. - View Dependent Claims (4, 6, 11, 12, 13, 14)
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Specification