Method and apparatus for controlling deactivation timer of cell
The present specification proposes a technique for controlling a deactivation timer of a cell. Specifically, the present specification proposes a method for controlling a deactivation timer of a cell in a mobile communication system. The method comprises the steps of: configuring a primary cell and at least one secondary cell on user equipment (UE); receiving, from the UE, an indicator related to a deactivation timer for one secondary cell from among one or more secondary cells; and disabling, on the UE, the deactivation timer of one secondary cell on the basis of the indicator.
1. A method of controlling a deactivation timer of a cell in a mobile communication system, the method comprising:
configuring, at a user equipment (UE), a primary cell (P-Cell) and at least one secondary cell (S-Cell) including a first S-Cell;
configuring, at the UE, the deactivation timer for the first S-Cell based on a pre-defined deactivation time value, wherein the deactivation timer is configured to start when an medium access control (MAC) layer command activates the at least one S-Cell;
receiving, at the UE, a physical downlink control channel (PDCCH) order initiating random access for the first S-Cell;
if there is no S-Cell whose deactivation timer has been disabled by successful completion of random access, disabling, at the UE, the deactivation timer of the first S-Cell; and
if there is an S-Cell whose deactivation timer has been disabled by successful completion of random access, disabling, at the UE, the deactivation timer of the first S-Cell and applying the pre-defined deactivation time value to the S-Cell whose deactivation timer has been disabled by successful completion of random access.
2. The method of claim 1 , wherein the at least one S-Cell is included in a secondary timing advance group (TAG).
3. The method of claim 2 , wherein the first S-Cell is a timing reference cell of the secondary TAG.
4. The method of claim 1 , wherein the deactivation timer of the first S-Cell is disabled by applying an infinite time value.
5. The method of claim 1 , wherein the at least one S-Cell includes a second S-Cell.
6. A user equipment (UE) for controlling a deactivation timer of a cell in a mobile communication system, the UE comprising:
a transceiver configured to receive and/or transmit a signal; and
a processor coupled to the transceiver and configured to:
configure a primary cell (P-Cell) and at least one secondary cell (S-Cell) including a first S-Cell:
configure the deactivation timer for the first S-Cell based on a pre-defined deactivation time value, wherein the deactivation timer is configured to start when an medium access control (MAC) layer command activates the at least one S-Cell;
receive a physical downlink control channel (PDCCH) order initiating random access for the first S-Cell;
if there is no S-Cell whose deactivation timer has been disabled by successful completion of random access, disable the deactivation timer of the first S-Cell; and
if there is an S-Cell whose deactivation timer has been disabled by successful completion of random access, disable the deactivation timer of the first S-Cell and apply the pre-defined deactivation time value to the S-Cell whose deactivation timer has been disabled by successful completion of random access.