Method and apparatus for performing component carrier-specific reconfiguration

Abstract

Techniques for component carrier-specific reconfiguration are disclosed. A wireless transmit/receive unit (WTRU) is capable of transmitting or receiving via multiple component carriers. The WTRU may perform component carrier reconfiguration on a component carrier basis to add, remove or replace a component carrier. Discontinuous reception (DRX) and/or discontinuous transmission (DTX) may be performed on at least one component carrier, wherein DRX and/or DTX patterns on the component carriers may not overlap each other. A random access procedure may be performed at the target cell on one component carrier while other component carriers are inactive. The component carrier-specific reconfiguration or handover of a component carrier or a channel may be implemented in coordinated multiple point transmission (CoMP), wherein a handover of a control channel, not a traffic channel, may be performed. Alternatively, a handover of a traffic channel may be performed.

What is claimed is: 
     
         1 . A method implemented in a wireless transmit/receive unit (WTRU) for handover, the method comprising:
 receiving downlink transmissions from a plurality of cells in a coordinated multiple point transmission (CoMP) active set on at least one component carrier; and   performing a handover of a control channel, wherein the control channel is received from a primary cell, wherein a handover for a downlink traffic channel is performed on a condition that a quality measurement of a downlink transmission from the CoMP active set is below a threshold.   
     
     
         2 . The method of  claim 1  further comprising adding, removing or replacing at least one component carrier. 
     
     
         3 . The method of  claim 1  further comprising:
 performing discontinuous reception (DRX) on component carriers, wherein DRX patterns on the component carriers do not overlap each other. 
 
     
     
         4 . The method of  claim 1  further comprising:
 performing discontinuous transmission (DTX) on component carriers, wherein DTX patterns on the component carriers do not overlap each other. 
 
     
     
         5 . The method of  claim 1  wherein the WTRU is aware of the CoMP active set and performs a handover for a traffic channel. 
     
     
         6 . The method of  claim 1  further comprising:
 transmitting uplink transmissions to a plurality of cells in a coordinated multiple point (CoMP) active set on at least one component carrier; and 
 performing a handover for an uplink traffic channel on a condition that the uplink transmissions cannot be received at any cell in the CoMP active set. 
 
     
     
         7 . The method of  claim 1  further comprising:
 performing measurements on at least one other component carrier; and 
 reporting the measurements. 
 
     
     
         8 . The method of  claim 1  further comprising:
 receiving a radio resource control (RRC) message including parameters for a plurality of component carriers. 
 
     
     
         9 . The method of  claim 8  wherein the RRC message includes a first group of component carriers with a dedicated random access channel (RACH) preamble and a second group of component carriers with a contention-based RACH preamble, so that the WTRU selects a component carrier to initiate the handover from one of the groups. 
     
     
         10 . A wireless transmit/receive unit (WTRU) for performing component carrier-specific reconfiguration, the WTRU further comprising:
 a processor configured to receive downlink transmissions from a plurality of cells in a coordinated multiple point transmission (CoMP) active set on at least one component carrier, and to perform a handover for a control channel that is received from a primary cell, wherein the processor is configured to perform a handover for a downlink traffic channel on a condition that a quality measurement of a downlink transmission from the CoMP active set is below a threshold.   
     
     
         11 . The WTRU of  claim 10  wherein the processor is further configured to add, remove, or replace at least one component carrier. 
     
     
         12 . The WTRU of  claim 11  wherein the processor is configured to perform discontinuous reception (DRX) on component carriers, wherein DRX patterns on the component carriers do not overlap each other. 
     
     
         13 . The WTRU of  claim 11  wherein the processor is configured to perform discontinuous transmission (DTX) on component carriers, wherein DTX patterns on the component carriers do not overlap each other. 
     
     
         14 . The WTRU of  claim 10  wherein the processor is aware of the CoMP active set and performs a handover for a traffic channel. 
     
     
         15 . The WTRU of  claim 11  wherein the processor is configured to transmit uplink transmissions to a plurality of cells in a coordinated multiple point (CoMP) active set on at least one component carrier, and perform a handover for an uplink traffic channel on a condition that a quality measurement of an uplink transmission for the CoMP active set is below a threshold. 
     
     
         16 . The WTRU of  claim 11  wherein the processor is configured to perform measurements on at least one other component carrier, and report the measurements. 
     
     
         17 . The WTRU of  claim 11  wherein the processor is configured to receive a radio resource control (RRC) message including parameters for a plurality of component carriers. 
     
     
         18 . The WTRU of  claim 17  wherein the RRC message includes a first group of component carriers with a dedicated random access channel (RACH) preamble and a second group of component carriers with a contention-based RACH preamble, so that the processor selects a component carrier to initiate the handover from one of the groups.