Method and apparatus for carrier assignment, configuration and switching for multicarrier wireless communications
As part of carrier assignment and configuration for multicarrier wireless communications, a single uplink (UL) primary carrier may provide control information for multiple concurrent downlink (DL) carriers. Optionally, control information for each DL carrier may be transmitted over paired UL carriers. Carrier switching of UL and/or DL carriers, including primary and anchor carriers, may occur during normal operation or during handover, and may occur in only the UL or only the DL direction. A unidirectional handover is performed when only an UL carrier or only a DL carrier is switched as part of a handover. Switching of UL and/or DL carriers may be from one component carrier or a subset of carriers to another component carrier, another subset of carriers, or all carriers in the same direction.
1. A method for multicarrier wireless communications in a wireless transmit/receive unit (WTRU), comprising:
receiving first configuration information for a set of downlink (DL) component carriers and a set of uplink (UL) component carriers, the set of UL component carriers including a primary UL component carrier, and the set of DL component carriers including a primary DL component carrier;
receiving a handover command in a radio resource control (RRC) message via one or more of the DL component carriers, wherein the handover command triggers the WTRU to change the primary UL carrier and the primary DL component carrier;
applying second configuration information for a new primary UL component carrier and a new primary DL component carrier;
receiving signals over the configured set of DL component carriers; and
transmitting control information for the configured set of DL component carriers over a physical uplink control channel (PUCCH) only on the new primary UL component carrier, wherein the control information comprises one or more of a channel quality information (CQI) or a precoding matrix index (PMI), a first reporting periodicity and first offset value are used for transmitting control information associated with a first DL component carrier on the PUCCH of the new primary UL component carrier, and a second reporting periodicity and second offset value are used for transmitting control information associated with a second DL component carrier on the PUCCH of the new primary UL component carrier.
2. The method of claim 1 wherein the set of DL component carriers and the set of UL component carriers are component carriers for Long Term Evolution Advanced (LTE-A) wireless communications.
3. The method of claim 1 wherein the handover command indicates reconfiguration information for one or more of the DL component carriers in the set of DL component carriers.
4. The method of claim 1 wherein the control information further comprises at least one of: a hybrid automatic repeat request (HARD) feedback, a scheduling request (SR), channel state information (CSI), or a rank information (RI).
5. The method of claim 1 wherein the first configuration information is received via multiple messages.
6. The method of claim 1 , wherein the first reporting periodicity is different than the second reporting periodicity and the first offset value is different than the second offset value.
7. The method of claim 1 wherein the identities of the new primary UL component carrier and the new primary DL component carrier are WTRU-specific.
8. The method of claim 1 wherein the new primary UL component carrier is paired with the new primary DL component carrier.
9. The method of claim 1 , further comprising:
receiving an indication that one of the DL component carriers has been deactivated, wherein the indication is received from a base station via a medium access control (MAC) control element (CE); and
deactivating the DL component carrier based on the received indication.
10. The method of claim 1 , further comprising:
receiving an indication that one of the DL component carriers has been activated; and
activating the DL component carrier based on the received indication.
11. A wireless transmit/receive unit (WTRU) configured for multicarrier wireless communications comprising:
a receiver configured to:
receive first configuration information for a set of downlink (DL) component carriers and a set of uplink (UL) component carriers, the set of UL component carriers including a first primary UL component carrier, and the set of DL component carriers including a primary DL component carrier;
receive a handover command in a radio resource control (RRC) message via the primary DL component carrier, wherein the WTRU is configured such that the handover command triggers the WTRU to change the primary UL component carrier and the primary DL component carrier;
a processor configured to apply second configuration information for a new primary UL component carrier and a new primary DL component carrier;
the receiver further configured to receive signals over the configured set of DL component carriers; and
a transmitter configured to transmit control information for the configured set of DL component carriers over a physical uplink control channel (PUCCH) only on the new primary UL component carrier, wherein the control information comprises one or more of a channel quality information (CQI) or a precoding matrix index (PMI), a first reporting periodicity and first offset value are used for transmitting control information associated with a first DL component carrier on the PUCCH of the new primary UL component carrier, and a second reporting periodicity and second offset value are used for transmitting control information associated with a second DL component carrier on the PUCCH of the new primary UL component carrier.
12. The WTRU of claim 11 wherein the set of DL carriers and the set of UL component carriers are component carriers for Long Term Evolution Advanced (LTE-A) wireless communications.
13. The WTRU of claim 11 wherein the handover command indicates reconfiguration information for one or more of the DL component carriers in the set of DL component carriers.
14. The WTRU of claim 11 wherein the control information further comprises at least one of: a hybrid automatic repeat request (HARD) feedback, a scheduling request (SR), a channel state information (CSI), or rank information (RI).
15. The WTRU of claim 11 wherein the first configuration information is received via multiple messages.
16. The WTRU of claim 11 wherein the first reporting periodicity is different than the second reporting periodicity and the first offset value is different than the second offset value.
17. The WTRU of claim 11 wherein the identities of the new primary UL component carrier and the new primary DL component carrier are WTRU-specific.
18. The WTRU of claim 11 wherein the new primary UL component carrier is paired with the new primary DL component carrier.
19. The WTRU of claim 11 , wherein the processor is further configured to deactivate one of the DL component earners, wherein the DL component carrier is deactivated on expiration of a timer.
20. The WTRU of claim 11 , wherein the processor is further configured to:
receive an indication that one of the DL component carriers has been activated; and
activate the DL component carrier based on the received indication.