Component carrier activation/deactivation in multi-carrier systems

Patent metadata

Field	Value
Publication number	US-2016373233-A1
Application number	US-201615254332-A
Country	US
Kind code	A1
Filing date	Sep 1, 2016
Priority date	Nov 19, 2009
Publication date	Dec 22, 2016
Grant date	—

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.

First claim

What is claimed is:

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); receiving an activation/deactivation medium access control (MAC) control element (CE) comprising fields for signaling activation/deactivation states for multiple SCells; determining the activation/deactivation state for the SCell using an identity of the SCell as an index to the activation/deactivation MAC CE; activating or deactivating the SCell based on the determined activation/deactivation state; triggering a power headroom report (PHR) responsive to activation of the SCell and on a condition that the SCell is configured for uplink transmission; and generating a MAC protocol data unit (PDU) including a PHR MAC CE to report the triggered PHR in a next available transmission opportunity based on a size of the PHR MAC CE and on condition that the WTRU has allocated uplink resources and the triggered PHR is pending for transmission.

2 . The method of claim 1 , wherein the SCell is activated on condition that the determined activation/deactivation state commands an activation of the SCell.

3 . The method of claim 1 , wherein the SCell is deactivated on condition that the determined activation/deactivation state commands a deactivation of the SCell.

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 activation of 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:
responsive to deactivation of 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:
responsive to deactivation of the SCell, stopping 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:
responsive to deactivation of the SCell, releasing 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.

11 . The method of claim 1 , wherein the activation/deactivation MAC CE includes a bitmap, wherein each bit in the bitmap corresponds to, and indicates the activation/deactivation states of, one of the multiple SCells.

12 . The method of claim 1 , wherein the SCell is initially configured in a deactivated state.

13 . The method of claim 1 , wherein the SCell is configured using an SCell configuration received via dedicated signaling, and wherein the SCell configuration comprises the identity of the SCell and a radio resource configuration that identifies configuration parameters for downlink (DL) and uplink (UL) resources of the SCell.

14 . The method of claim 1 , wherein a deactivation timer is started or restarted responsive to the activation/deactivation MAC CE signaling activation of the SCell.

15 . The method of claim 14 , wherein the activation/deactivation MAC CE is received prior to expiry of the deactivation timer.

16 . The method of claim 1 , further comprising transmitting the MAC PDU at the next available transmission opportunity.

17 . The method of claim 1 , wherein the PHR MAC CE includes a valid PHR value for at least the SCell.

18 . 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);
receive an activation/deactivation medium access control (MAC) control element (CE) comprising fields for signaling activation/deactivation states for multiple SCells;
determine the activation/deactivation state for the SCell using an identity of the SCell as an index to the activation/deactivation MAC CE;
activate or deactivate the SCell based on the determined activation/deactivation state; and
trigger a power headroom report responsive to activation of the SCell, and on a condition that the SCell is configured for uplink transmission
generate a MAC protocol data unit (PDU) including a PHR MAC CE to report the triggered PHR in a next available transmission opportunity based on a size of the PHR MAC CE and on a condition that the WTRU has allocated uplink resources and the triggered PHR is pending for transmission.

19 . The WTRU of claim 18 , wherein the SCell is activated on condition that the determined activation/deactivation state commands an activation of the SCell.

20 . The WTRU of claim 18 , wherein the SCell is deactivated on condition that the determined activation/deactivation state commands a deactivation of the SCell.

21 . The WTRU of claim 18 , 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 activation of the SCell.

22 . The WTRU of claim 18 , 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.

23 . The WTRU of claim 18 , wherein the processor is further configured to:
responsive to deactivation of 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.

24 . The WTRU of claim 18 , 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.

25 . The WTRU of claim 18 , wherein the processor is further configured to:
responsive to deactivation of the SCell, stop a reporting of a channel quality indicator, a precoding matrix index, or a rank indication for the SCell.

26 . The WTRU of claim 18 , wherein the processor is further configured to:
responsive to deactivation of the SCell, release a sounding reference signal reporting configuration for the SCell.

27 . The WTRU of claim 18 , 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.

28 .

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Pelletier Ghyslain
• Marinier Paul
• Rudolf Marian
• Terry Stephen E
• Olesen Robert L

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W76/028

  Electricity · mapped topic

• H04W52/365

  Power headroom reporting · CPC title

• H04W76/025

  Electricity · mapped topic