Method and apparatus for deactivating secondary carriers in mobile communication system using carrier aggregation

Patent metadata

Field	Value
Publication number	US-9717078-B2
Application number	US-201514597769-A
Country	US
Kind code	B2
Filing date	Jan 15, 2015
Priority date	Feb 21, 2011
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A method and an apparatus in a mobile communication system are provided. The method by a terminal in a mobile communication system includes receiving first information for activating a secondary cell (SCell) from a base station, activating the SCell based on the first information, starting a timer associated with the SCell, restarting, if second information for the activated SCell is received from the base station, the timer associated with the SCell, and if the timer expires, applying by the terminal, one or more corresponding actions for deactivating the SCell no later than in a predefined subframe. The one or more corresponding actions include at least one of preventing from transmitting a sounding reference signal (SRS) on the SCell, and preventing from reporting at least one of a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and a precoder type indicator (PTI) for the SCell

First claim

What is claimed is:

1. A method by a terminal in a mobile communication system, the method comprising:
receiving, by the terminal, first information for activating a secondary cell (SCell) from a base station;
activating, by the terminal, the SCell based on the first information;
starting, by the terminal, a timer associated with the SCell;
restarting, by the terminal, if second information for the activated SCell is received from the base station, the timer associated with the SCell; and
if the timer expires, applying by the terminal, one or more corresponding actions for deactivating the SCell no later than in a predefined subframe,
wherein the one or more corresponding actions include at least one of preventing, by the terminal, from transmitting a sounding reference signal (SRS) on the SCell, and preventing, by the terminal, from reporting at least one of a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and a precoder type indicator (PTI) for the SCell.

2. The method of claim 1 , wherein the one or more corresponding actions include preventing, by the terminal, from monitoring a physical downlink control channel (PDCCH) on the SCell, and preventing, by the terminal, from monitoring a PDCCH for the SCell.

3. The method of claim 1 , wherein the timer is a value in a number of radio frames configured by a higher layer signal.

4. The method of claim 1 , wherein the second information includes at least one of an uplink grant on the activated SCell, a downlink assignment on the activated SCell, and a control message for activating the SCell.

5. The method of claim 1 , wherein the first information includes a bitmap indicator corresponding to at least one SCell.

6. A method by a base station in a mobile communication system, the method comprising:
generating, by the base station, first information for activating a secondary cell (SCell); and
transmitting, by the base station, the first information to a terminal,
wherein the SCell is activated based on the first information, a timer associated with the SCell is started, if the timer expires in subframe n one or more corresponding actions for deactivating the SCell are applied no later than in a predefined subframe by the terminal, and the one or more corresponding actions include at least one of preventing, by the terminal, from transmitting a sounding reference signal (SRS) on the SCell, and preventing, by the terminal, from reporting at least one of a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and a precoder type indicator (PTI) for the SCell.

7. The method of claim 6 , wherein the one or more corresponding actions include preventing, by the terminal, from monitoring a physical downlink control channel (PDCCH) on the SCell, and preventing, by the terminal, from monitoring a PDCCH for the SCell.

8. The method of claim 6 , wherein the timer is a value in a number of radio frames configured by a higher layer signal.

9. The method of claim 6 , wherein the second information includes at least one of an uplink grant on the activated SCell, a downlink assignment on the activated SCell, and a control message for activating the SCell.

10. The method of claim 6 , wherein the first information includes a bitmap indicator corresponding to at least one SCell.

11. A terminal in a mobile communication system, the terminal comprising:
a transceiver for transmitting and receiving a signal; and
a controller configured:
to receive first information for activating a secondary cell (SCell) from a base station;
to activate the SCell based on the first information;
to start a timer associated with the SCell;
to restart, if second information for the activated SCell is received from the base station, the timer associated with the SCell; and
if the timer expires, to apply one or more corresponding actions for deactivating the SCell no later than in a predefined subframe,

wherein the one or more corresponding actions include at least one of preventing, by the terminal, from transmitting a sounding reference signal (SRS) on the SCell, and preventing, by the terminal, from reporting at least one of a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and a precoder type indicator (PTI) for the SCell.

12. The terminal of claim 11 , wherein the one or more corresponding actions include preventing, by the terminal, from monitoring a physical downlink control channel (PDCCH) on the SCell, and preventing, by the terminal, from monitoring a PDCCH for the SCell.

13. The terminal of claim 11 , wherein the timer is a value in a number of radio frames configured by a higher layer signal.

14. The terminal of claim 11 , wherein the second information includes at least one of an uplink grant on the activated SCell, a downlink assignment on the activated SCell, and a control message for activating the SCell.

15. The terminal of claim 11 , wherein the first information includes a bitmap indicator corresponding to at least one SCell.

16. A base station in a mobile communication system, the base station including:
a transceiver for transmitting and receiving a signal; and
a controller configured:
to generate first information for activating a secondary cell (SCell), and
to transmit the first information to a terminal,

wherein the SCell is activated based on the first information, a timer associated with the SCell is started, if the timer expires in subframe n one or more corresponding actions for deactivating the SCell are applied no later than in a predefined subframe by the terminal, and the one or more corresponding actions include at least one of preventing, by the terminal, from transmitting a sounding reference signal (SRS) on the SCell, and preventing, by the terminal, from reporting at least one of a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and a precoder type indicator (PTI) for the SCell.

17. The base station of claim 16 , wherein the one or more corresponding actions include preventing, by the terminal, from monitoring a physical downlink control channel (PDCCH) on the SCell, and preventing, by the terminal, from monitoring a PDCCH for the SCell.

18. The base station of claim 16 , wherein the timer is a value in a number of radio frames configured by a higher layer signal.

19. The base station of claim 16 , wherein the second information includes at least one of an uplink grant on the activated SCell, a downlink assignment on the activated SCell, and a control message for activating the SCell.

20. The base station of claim 16 , wherein the first information includes a bitmap indicator corresponding to at least one SCell.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Jang Jaehyuk
• Kim Soenghun

Classifications

• H04L5/0078

  Timing of allocation · CPC title

• H04L5/0057

  Physical resource allocation for CQI · CPC title

• H04L5/0032

  Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation · CPC title

• H04W72/00

  Local resource management · CPC title

• H04L5/0098 Primary

  Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands · CPC title