Methods, systems and apparatus for defining and using phich resources for carrier aggregation

Abstract

Systems, methods, and instrumentalities are disclosed to provide feedback to a user equipment (UE). A UE may transmit uplink data via a supplementary cell. A network device, such as a HeNB, eNB, etc., may receive the uplink data from the UE via the supplementary cell. The network device may send feedback associated with the uplink data to the UE via a physical downlink shared channel (PDSCH) when downlink data is available for transmission to the UE. The feedback may be physical hybrid ARQ indicator channel (PHICH) ACK/NACK information. The feedback sent via the PDSCH may be multiplexed with the downlink data. The network device may send the feedback associated with the uplink data to the UE via a physical downlink control channel (PDCCH) when downlink data is not available for transmission to the UE.

1 - 16 . (canceled) 
     
     
         17 . A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
 receiving configuration information associated with a supplementary cell that uses an unlicensed band;   transmitting data to a network via the supplementary cell; and   receiving feedback associated with the data from the network via a Physical Downlink Shared Channel (PDSCH) or a Physical Downlink Control Channel (PDCCH), the PDSCH and the PDCCH being carried on a licensed band, wherein, when the feedback is received on the PDSCH, the feedback is multiplexed with downlink data, and wherein, when the feedback is received on the PDCCH, the feedback is received in a Downlink Control Information (DCI) format that comprises ACK/NACK information.   
     
     
         18 . The method of  claim 17 , wherein the ACK/NACK information is received by the WTRU in a resource block assignment. 
     
     
         19 . The method of  claim 18 , wherein the resource block assignment is a single resource block using a type 2 allocation. 
     
     
         20 . The method of  claim 17 , wherein the DCI format is format 1C. 
     
     
         21 . The method of  claim 17 , wherein the feedback is received on a primary component carrier. 
     
     
         22 . The method of  claim 17 , wherein the unlicensed band comprises TV white space. 
     
     
         23 . A wireless transmit/receive unit (WTRU) comprising:
 a processor configured to:   receive configuration information associated with a supplementary cell that uses an unlicensed band;   transmit data to a network via the supplementary cell; and   receive feedback associated with the data from the network via a Physical Downlink Shared Channel (PDSCH) or a Physical Downlink Control Channel (PDCCH), the PDSCH and the PDCCH being carried on a licensed band, wherein, when the feedback is received on the PDSCH, the feedback is multiplexed with downlink data, and wherein, when the feedback is received on the PDCCH, the feedback is received in a Downlink Control Information (DCI) format that comprises ACK/NACK information.   
     
     
         24 . The WTRU of  claim 23 , wherein the ACK/NACK information is received in a resource block assignment. 
     
     
         25 . The WTRU of  claim 24 , wherein the resource block assignment is a single resource block using a type 2 allocation. 
     
     
         26 . The WTRU of  claim 23 , wherein the DCI format is format 1C. 
     
     
         27 . The WTRU of  claim 23 , wherein the processor is configured to receive the feedback on a primary component carrier. 
     
     
         28 . The WTRU of  claim 23 , wherein the unlicensed band comprises TV white space.