SECONDARY CARRIER ACTIVATION/DEACTIVATION METHOD AND APPARATUS FOR MOBILE COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION

• US 20120176926A1
• Filed: 01/11/2012
• Published: 07/12/2012
• Est. Priority Date: 01/11/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: JANG, Jae Hyuk, KIM, Soeng Hun, VAN LIESHOUT, Gert-Jan, JEONG, Kyeong In, CHO, Joon Young, NG, Boon Loong
• Granted Patent: US 8,792,376 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/27 between access points
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A secondary carrier activation/deactivation method for activating/deactivating secondary carriers in addition to a primary carrier is provided for a mobile communication system supporting carrier aggregation. The method includes identifying, when a secondary carrier control message is received from a base station, carriers to be activated are deactivated, determining, when the message includes a secondary carrier activation command, whether a first time point has arrived, and executing, when the first time point arrives, predetermined first operations. The present invention is advantageous to avoid malfunctions in communication system supporting carrier aggregation by defining UE operations to be taken in SCell activation and deactivation.

Claims

1. A method for activating/deactivating secondary carriers of a terminal in a mobile communication system supporting carrier aggregation, the method comprising:

identifying, when a secondary carrier control message is received from a base station, carriers to be activated or deactivated;

determining, when the message includes a secondary carrier activation command, whether a first time point has arrived; and

executing, when the first time point arrives, predetermined first operations.

2. The method of claim 1, further comprising:

executing, when the message includes a secondary carrier deactivation command, predetermined second operations before a second time point arrives; and

executing predetermined third operations at the second time point.

3. The method of claim 1, wherein the first time point arrives after 8 subframes from receipt of the secondary carrier control message.

4. The method of claim 1, wherein the first operations comprise at least one of channel state information report initiation, physical downlink control channel monitoring initiation on secondary carriers, and sounding reference signal transmission initiation.

5. The method of claim 4, wherein the channel state information comprises at least one of a channel quality indicator, a precoding matrix index, a rank indicator, and a precoder type indicator.

6. The method of claim 2, wherein the second operations comprise at least one of physical downlink control channel monitoring termination on secondary carriers and sounding reference signal transmission termination.

7. The method of claim 2, wherein the third operations comprise channel state information report termination.

8. The method of claim 2, wherein the second time point arrives after 8 subframes from receipt of the secondary carrier control message.

9. A terminal for controlling activation/deactivation of secondary carriers in a mobile communication system supporting carrier aggregation, the terminal comprising:

a transceiver for communicating signals with a base station; and

a controller for identifying, when a secondary carrier control message is received from the base station, carriers to be activated or deactivated, for determining, when the message includes a secondary carrier activation command, whether a first time point has arrived, and for executing, when the first time point arrives, predetermined first operations.

10. The terminal of claim 9, wherein the controller executes, when the message includes a secondary carrier deactivation command, predetermined second operations before a second time point arrives and executes predetermined third operations at the second time point.

11. The terminal of claim 9, wherein the first time point arrives after 8 subframes from receipt of the secondary carrier control message.

12. The terminal of claim 9, wherein the first operations comprise at least one of channel state information report initiation, physical downlink control channel monitoring initiation on secondary carriers, and sounding reference signal transmission initiation.

13. The terminal of claim 12, wherein the channel state information comprises at least one of a channel quality indicator, a precoding matrix index, a rank indicator, and a precoder type indicator.

14. The terminal of claim 10, wherein the second operations comprise at least one of physical downlink control channel monitoring termination on secondary carriers and sounding reference signal transmission termination.

15. The terminal of claim 10, wherein the third operations comprises channel state information report termination.

16. The terminal of claim 10, wherein the second time point arrives after 8 subframes from receipt of the secondary carrier control message.

17. A method for activating/deactivating secondary carriers of a terminal in a mobile communication system supporting carrier aggregation, the method comprising:

identifying, when a secondary carrier control message is received from a base station, carriers to be activated or deactivated;

determining, when the message includes a secondary carrier deactivation command, a first time point; and

executing, prior to the first time point, predetermined first operations.

18. The method of claim 17, further comprising:

when the first time point arrives, executing predetermined second operations.