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 timing advance command by a base station in a wireless communication system supporting a carrier aggregation technology, the method comprising:
- transmitting a system information block including a first timing alignment timer (TAT) for at least one of a first timing advance group (TAG) and a second TAG to use in transmitting a random access preamble;
receiving the random access preamble based on the system information block from a terminal; and
transmitting a first message including a timing advance command (TAC) and an identity of a TAG including the cell to the terminal,wherein the identity of the TAG is set to 00 if the TAC is to be applied to a primary cell in the first TAG and at least one secondary cell in the first TAG, andwherein the identity of the TAG is not set to 00 if the TAC is to be applied to at least one secondary cells in the second TAG not including the primary cell.
0 Assignments
0 Petitions
Accused Products
Abstract
The present invention involves defining the operation of a terminal for determining which time alignment timer is to be applied to a certain condition when specific time alignment timers operate for each carrier-wave group in the event a wireless communication system uses a carrier aggregation technique. According to the present invention, a terminal may perform communication without malfunctions using a time alignment timer suitable for a certain condition. In detail, a method for a terminal to operate a time alignment timer according to the present invention comprises the steps of: receiving, from a base station, a message including a timing advance command and an index on a timing advance group (TAG); and operating the time alignment timer for the TAG, wherein the index has a value of 00 when the TAG includes a first cell. In the meantime, a method for a terminal to operate a time alignment timer according to the present invention comprises the steps of: operating a first time alignment timer for a first timing advance group (TAG) including a first cell; operating a second time alignment timer upon receipt of a timing advance command for a second TAG that does not include the first cell; and, if the first time alignment timer has expired, deeming the second time alignment timer to also be expired. In addition, a method for a base station to control a time alignment timer according to the present invention comprises the steps of: determining whether or not an uplink timing of a terminal needs correction; and transmitting a message including a timing advance command and an index on a timing advance group (TAG), wherein the index has a value of 00 when the TAG includes a first cell.
-
Citations
6 Claims
-
1. A method for controlling timing advance command by a base station in a wireless communication system supporting a carrier aggregation technology, the method comprising:
-
transmitting a system information block including a first timing alignment timer (TAT) for at least one of a first timing advance group (TAG) and a second TAG to use in transmitting a random access preamble; receiving the random access preamble based on the system information block from a terminal; and transmitting a first message including a timing advance command (TAC) and an identity of a TAG including the cell to the terminal, wherein the identity of the TAG is set to 00 if the TAC is to be applied to a primary cell in the first TAG and at least one secondary cell in the first TAG, and wherein the identity of the TAG is not set to 00 if the TAC is to be applied to at least one secondary cells in the second TAG not including the primary cell. - View Dependent Claims (2, 3)
-
-
4. A base station for controlling timing advance command in a wireless communication system supporting a carrier aggregation technology, the base station comprising:
-
a transceiver configured to transmit and receive a signal; and a controller configured to; transmit a system information block including a first timing alignment timer (TAT) for at least one of a first timing advance group (TAG) and a second TAG to use in transmitting random access preamble, receive the random access preamble based on the system information block from a terminal, transmit a first message including a timing advance command (TAC) and an identity of a TAG including the cell to the terminal, wherein the identity of the TAG is set to 00 if the TAC is to be applied to a primary cell in the first TAG and at least one secondary cell in the first TAG, and wherein the identity of the TAG is not set to 00 if the TAC is to be applied to at least one secondary cell in the second TAG not including the primary cell. - View Dependent Claims (5, 6)
-
Specification