COMPONENT CARRIER ACTIVATION/DEACTIVATION IN MULTI-CARRIER SYSTEMS

• US 20150092713A1
• Filed: 10/24/2014
• Published: 04/02/2015
• Est. Priority Date: 11/19/2009
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: PELLETIER, Ghyslain, Marinier, Paul, Rudolf, Marian, Terry, Stephen E., Olesen, Robert L.
• Granted Patent: US 9,491,793 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 76/38 triggered by timers

Abstract

Methods and apparatus for addressing wireless transmit/receive unit (WTRU) behavior in response to configuration, configuration parameters and access issues related to the activation/deactivation process when the WTRU may be configured with multiple serving cells or carrier aggregation.

Claims

1. A method implemented at a wireless transmit/receive unit (WTRU) for handling carrier aggregation, comprising:

establishing a connection with a primary cell (PCell);

configuring the WTRU with a secondary cell (SCell); and

triggering, in response to an activation command for the SCell, a power headroom report on a condition that the SCell is configured for uplink transmission.

2. The method of claim 1, further comprising:

receiving a medium access control (MAC) control element (CE) activation/deactivation command; and

changing a state of the SCell in response to the MAC CE activation/deactivation command.

4. The method of claim 1, further comprising:

on a condition that the SCell is configured for reception of a physical downlink control channel, starting a monitoring of the physical downlink control channel in response to the activation command for the SCell.

5. The method of claim 1, further comprising:

receiving a cross-carrier scheduling configuration; and

determining, from the cross-carrier scheduling configuration, a starting symbol of a physical downlink shared channel for the SCell.

6. The method of claim 1, further comprising:

in response to a deactivation command for the SCell,

stopping a monitoring of a physical downlink control channel for the SCell; and

stopping receiving downlink assignments or uplink grants associated with the SCell.

7. The method of claim 1, further comprising:

receiving a cross-carrier scheduling configuration; and

determining, based on the cross-carrier scheduling configuration, a serving cell for receiving downlink allocations or uplink grants for the SCell.

8. The method of claim 1, further comprising:

stopping, in response to a deactivation command for the SCell, a reporting of a channel quality indicator, a precoding matrix index, or a rank indication for the SCell.

9. The method of claim 1, further comprising:

releasing, in response to a deactivation command for the SCell, a sounding reference signal reporting configuration for the SCell.

10. The method of claim 1, further comprising:

releasing a configuration for the SCell responsive to an indication of a radio resource controller connection re-establishment.

3. The method of claim 3, further comprising:

determining an activation/deactivation state of the SCell from the MAC CE activation/deactivation command using an index associated with the SCell; and

changing the state of the SCell in accordance with the activation/deactivation state.

11. A wireless transmit/receive unit (WTRU) configured for carrier aggregation, comprising:

a transceiver; and

a processor in communication with the transceiver,

wherein the processor is configured to;

establish a connection with a primary cell (PCell);

configure the WTRU with a secondary cell (SCell); and

trigger, in response to an activation command for the SCell, a power headroom report on a condition that the SCell is configured for uplink transmission.

12. The WTRU of claim 11, wherein the processor is further configured to:

receive a medium access control (MAC) control element (CE) activation/deactivation command; and

change a state of the SCell in response to the MAC CE activation/deactivation command.

14. The WTRU of claim 11, wherein the processor is further configured to:

on a condition that the SCell is configured for reception of a physical downlink control channel, start a monitoring of the physical downlink control channel in response to the activation command for the SCell.

15. The WTRU of claim 11, wherein the processor is further configured to:

receive a cross-carrier scheduling configuration; and

determine, from the cross-carrier scheduling configuration, a starting symbol of a physical downlink shared channel for the SCell.

16. The WTRU of claim 11, wherein the processor is further configured to:

in response to a deactivation command for the SCell,

stop a monitoring of a physical downlink control channel for the SCell; and

stop receiving downlink assignments or uplink grants associated with the SCell.

17. The WTRU of claim 11, wherein the processor is further configured to:

receive a cross-carrier scheduling configuration; and

determine, based on the cross-carrier scheduling configuration, a serving cell for receiving downlink allocations or uplink grants for the SCell.

18. The WTRU of claim 11, wherein the processor is further configured to:

stop, in response to a deactivation command for the SCell, a reporting of a channel quality indicator, a precoding matrix index, or a rank indication for the SCell.

19. The WTRU of claim 11, wherein the processor is further configured to:

release, in response to a deactivation command for the SCell, a sounding reference signal reporting configuration for the SCell.

20. The WTRU of claim 11, wherein the processor is further configured to:

release a configuration for the SCell responsive to an indication of a radio resource controller connection re-establishment.

13. The WTRU of claim 13, wherein the processor is further configured to:

determine an activation/deactivation state of the SCell from the MAC CE activation/deactivation command using an index associated with the SCell; and

change the state of the SCell in accordance with the activation/deactivation state.