Aperiodic channel quality indicator report in carrier aggregation

Abstract

Techniques for reporting channel quality information (CQI) in a multi-carrier wireless communication system are disclosed. In one aspect, a user equipment determines one or more reporting groups, each comprising a plurality of component carriers which are configured for the user equipment. The user equipment may detect a trigger from a base station that selects a reporting group and may respond to the trigger by sending CQI for at least the activated component carriers in the selected reporting group.

1 . (canceled) 
     
     
         2 . A method in a base station, comprising:
 signaling to a user equipment, UE, one or more reporting sets associated with a plurality of component carriers, wherein the one or more reporting sets are configured for the UE;   transmitting, on a downlink control channel, a trigger for the transmission of aperiodic channel quality information (CQI) by the UE, wherein the trigger for the transmission of aperiodic CQI comprises two or more triggering bits of a downlink control channel message that form a code corresponding to a reporting set in the one or more reporting sets; and   receiving, on an uplink data channel corresponding to the downlink control channel, an aperiodic CQI report for component carriers in the reporting set corresponding to the trigger.   
     
     
         3 . The method of  claim 2 , wherein the one or more reporting sets are signaled to the UE in one or more radio resource control (RRC) messages. 
     
     
         4 . The method of  claim 2 , wherein a number of the two or more triggering bits is smaller than a number of component carriers in the plurality of component carriers. 
     
     
         5 . The method of  claim 2 , wherein the downlink control channel schedules transmissions on the uplink data channel. 
     
     
         6 . The method of  claim 2 , wherein the aperiodic CQI report received on the uplink data channel comprises CQI multiplexed with data transmissions. 
     
     
         7 . The method of  claim 2 , wherein the aperiodic CQI for the component carriers in the reporting set corresponding to the trigger is jointly coded. 
     
     
         8 . The method of  claim 2 , wherein the aperiodic CQI for the component carriers in the reporting set corresponding to the trigger is separately coded. 
     
     
         9 . The method of  claim 2 , wherein the aperiodic CQI comprises wideband CQI feedback for at least one of the component carriers in the reporting set corresponding to the trigger. 
     
     
         10 . The method of  claim 2 , wherein the aperiodic CQI comprises sub-band CQI feedback for at least one of the component carriers in the reporting set corresponding to the trigger. 
     
     
         11 . The method of  claim 2 , wherein the trigger for the transmission of aperiodic CQI comprises an uplink grant for the UE. 
     
     
         12 . An apparatus configured for wireless communication, the apparatus comprising:
 at least one processor; and   a memory coupled to the at least one processor,   wherein the at least one processor is configured to:
 signal to a user equipment, UE, one or more reporting sets associated with a plurality of component carriers, wherein the one or more reporting sets are configured for the UE, 
 transmit, on a downlink control channel, a trigger for the transmission of aperiodic channel quality information (CQI) by the UE, wherein the trigger for the transmission of aperiodic CQI comprises two or more triggering bits of a downlink control channel message that form a code corresponding to a reporting set in the one or more reporting sets, and 
 receive, on an uplink data channel corresponding to the downlink control channel, an aperiodic CQI report for component carriers in the reporting set corresponding to the trigger. 
   
     
     
         13 . The apparatus of  claim 12 , wherein the one or more reporting sets are signaled to the UE in one or more radio resource control (RRC) messages. 
     
     
         14 . The apparatus of  claim 12 , wherein a number of the two or more triggering bits is smaller than a number of component carriers in the plurality of component carriers. 
     
     
         15 . The apparatus of  claim 12 , wherein the downlink control channel schedules transmissions on the uplink data channel. 
     
     
         16 . The apparatus of  claim 12 , wherein the aperiodic CQI report received on the uplink data channel comprises CQI multiplexed with data transmissions. 
     
     
         17 . The apparatus of  claim 12 , wherein the aperiodic CQI for the component carriers in the reporting set corresponding to the trigger is jointly coded. 
     
     
         18 . The apparatus of  claim 12 , wherein the aperiodic CQI for the component carriers in the reporting set corresponding to the trigger is separately coded. 
     
     
         19 . The apparatus of  claim 12 , wherein the aperiodic CQI comprises wideband CQI feedback for at least one of the component carriers in the reporting set corresponding to the trigger. 
     
     
         20 . The apparatus of  claim 12 , wherein the aperiodic CQI comprises sub-band CQI feedback for at least one of the component carriers in the reporting set corresponding to the trigger. 
     
     
         21 . The apparatus of  claim 12 , wherein the trigger for the transmission of aperiodic CQI comprises an uplink grant for the UE. 
     
     
         22 . A non-transitory, computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations comprising:
 signaling to a user equipment, UE, one or more reporting sets associated with a plurality of component carriers, wherein the one or more reporting sets are configured for the UE;   transmitting, on a downlink control channel, a trigger for the transmission of aperiodic channel quality information (CQI) by the UE, wherein the trigger for the transmission of aperiodic CQI comprises two or more triggering bits of a downlink control channel message that form a code corresponding to a reporting set in the one or more reporting sets; and   receiving, on an uplink data channel corresponding to the downlink control channel, an aperiodic CQI report for component carriers in the reporting set corresponding to the trigger.