Ack/nack feedback method in wireless communication system

Abstract

A method of ACK/NACK feedback in a wireless communication system. The method includes determining, by a UE, a number of public sub-frames, all of which are uplink sub-frame in PCC and any SCC sub-frames of any radio frame in frame structure configurations according to the frame structure configurations of the PCC and any SCC, selecting, by the UE, a configuration, uplink sub-frames of which merely include sub-frames corresponding to the determined number of public sub-frames from existing seven kinds of frame structure configurations, and feeding back, by the UE, to an eNB ACK/NACK information corresponding to PDSCH in the SCC on the PCC adopting a timing relationship between the PDSCH and the ACK/NACK corresponding to the selected configuration.

1 . An Acknowledgement/Non Acknowledgement (NACK) feedback method in a wireless communication system, the method comprising:
 determining, by a User Equipment (UE), a number of public sub-frames, all of which are uplink sub-frame in Primary Component Carrier (PCC) and any Secondary Component Carrier (SCC) sub-frames of any radio frame in frame structure configurations according to the frame structure configurations of the PCC and any SCC;   selecting, by the UE, a configuration, uplink sub-frames of which merely comprise sub-frames corresponding to the determined number of public sub-frames from existing seven kinds of frame structure configurations; and   feeding back, by the UE, to an Evolved NodeB, (eNB) ACK/NACK information corresponding to Physical Downlink Shared Channel, (PDSCH) in the SCC on the PCC adopting a timing relationship between the PDSCH and the ACK/NACK corresponding to the selected configuration.   
     
     
         2 . The method of  claim 1 , further comprising:
 feeding back, by the UE, to the eNB the ACK/NACK information corresponding to the PDSCH in the PCC on the PCC adopting the timing relationship between the PDSCH and ACK/NACK corresponding to the selected configuration.   
     
     
         3 . The method of  claim 1 , further comprising:
 feeding back, by the UE, to the eNB the ACK/NACK information corresponding to the PDSCH in the PCC on the PCC adopting the timing relationship between the PDSCH and the ACK/NACK corresponding to the frame structure configuration of the PCC.   
     
     
         4 . The method of  claim 2 , wherein, when a bundled window of downlink data sub-frames determined by the UE comprises uplink data sub-frames, further comprising:
 mapping the ACK/NACK corresponding to the uplink data sub-frames into a Discontinuous Transmission (DTX) status, or not feeding back any ACK/NACK information.   
     
     
         5 . The method of  claim 1 , wherein, when the UE is configured with more than two PCCs, before determining, by the UE, the determined number of public sub-frames, all of which are uplink sub-frame in PCC and any SCC sub-frames of a radio frame in the frame structure configurations, the method further comprises: notifying, by the eNB, the UE of a number of PCC for feeding back the ACK/NACK through Radio Resource Control (RRC), signaling. 
     
     
         6 . The method of  claim 1 , wherein the selecting of, by the UE, the configuration, uplink sub-frames of which merely comprise sub-frames corresponding to the determined number of public sub-frames from existing seven kinds of frame structure configurations comprises:
 supposing that in any radio frame of the frame structure configurations, a configuration including two uplink and downlink sub-frame switching points is the configuration of the first class and the other configurations are the configurations of the second class, the two kinds of configurations of UE are configuration A and configuration B;   selecting, by the UE, configuration B when configuration A and configuration B belong to a same class of configuration, and proportion of uplink sub-frames in configuration A is larger than that of configuration B;   selecting, by the UE, a configuration other than configuration 0 in configuration A and configuration B when configuration A and configuration B do not belong to a same class of configuration, and either of configuration A and configuration B is configuration 0;   selecting, by the UE, a configuration other than configuration 6 in configuration A and configuration B when configuration A and configuration B do not belong to a same class of configuration, and neither of configuration A and configuration B is configuration 0 and either of them is configuration 6;   selecting, by the UE, configuration 5 when configuration A and configuration B do not belong to a same class of configuration and either of configuration A and configuration B is configuration 5;   selecting, by the UE, configuration 4 when (A, B) is (1, 3) or (1, 4); and   selecting, by the UE, configuration 5 when (A, B) is (2, 3) or (2, 4).   
     
     
         7 . An Acknowledgement (ACK)/Non Acknowledgement (NACK) feedback method in a wireless communication system, the method comprising:
 notifying, by an Evolved NodeB (eNB), a User Equipment (UE) of configured information of a Primary Component Carrier (PCC), and all Secondary Component Carriers (SCC) through high-level signaling, wherein the configured information of the PCC and all SCCs of the UE comprises: a frame structure configuration of each Component Carrier (CC) configured for the UE, and further comprises: a number of the PCC and all SCCs;   determining, by the UE, a frame structure configuration according to the information of the frame structure configurations of the PCC and all SCCs sent from the eNB; and   feeding back, by the UE, to the eNB, ACK/NACK information corresponding to Physical Downlink Shared Channel (PDSCH) in the SCCs on the PCC adopting a timing relationship between the PDSCH and the ACK/NACK corresponding to the determined frame structure configuration.   
     
     
         8 . The method of  claim 7 , wherein, the determining of, by the UE, the frame structure configuration according to the information of the frame structure configurations of the PCC and all SCCs sent from the eNB comprises:
 supposing that in any radio frame of the frame structure configurations, a configuration including two uplink and downlink sub-frame switching points is the configuration of the first class and the other configurations are the configurations of the second class, the two kinds of configurations of UE are configuration A and configuration B;   determining, by the UE, configuration B when configuration A and configuration B belong to a same class of configuration, and proportion of uplink sub-frames in configuration A is larger than that of configuration B;   determining, by the UE, a configuration other than configuration 0 in configuration A and configuration B when configuration A and configuration B do not belong to a same class of configuration, and either of configuration A and configuration B is configuration 0;   determining, by the UE, a configuration other than configuration 6 in configuration A and configuration B when configuration A and configuration B do not belong to a same class of configuration, and neither of configuration A and configuration B is configuration 0 and either of them is configuration 6;   determining, by the UE, configuration 5 when configuration A and configuration B do not belong to a same class of configuration and either of configuration A and configuration B is configuration 5;   determining, by the UE, configuration 4 when (A, B) is (1, 3) or (1, 4); and   determining, by the UE, configuration 5 when (A, B) is (2, 3) or (2, 4).   
     
     
         9 . The method of  claim 7 , further comprising:
 feeding back, by the UE, to the eNB the ACK/NACK information corresponding to the PDSCH in the PCC on the PCC adopting the timing relationship between the PDSCH and ACK/NACK corresponding to the determined configuration.   
     
     
         10 . The method of  claim 7 , further comprising:
 feeding back, by the UE, to the eNB the ACK/NACK information corresponding to the PDSCH in the PCC on the PCC adopting the timing relationship between the PDSCH and ACK/NACK corresponding to the frame structure configuration of the PCC.   
     
     
         11 . The method of  claim 9 , wherein, when a bundled window of downlink data sub-frames determined by the UE comprises uplink data sub-frames, further comprising:
 mapping the ACK/NACK corresponding to the uplink data sub-frames into a Discontinuous Transmission (DTX) status, or not feeding back any ACK/NACK information.   
     
     
         12 . The method of  claim 3 , wherein, when a bundled window of downlink data sub-frames determined by the UE comprises uplink data sub-frames, further comprising:
 mapping the ACK/NACK corresponding to the uplink data sub-frames into a Discontinuous Transmission (DTX) status, or not feeding back any ACK/NACK information.   
     
     
         13 . The method of  claim 10 , wherein, when a bundled window of downlink data sub-frames determined by the UE comprises uplink data sub-frames, further comprising:
 mapping the ACK/NACK corresponding to the uplink data sub-frames into a Discontinuous Transmission (DTX) status, or not feeding back any ACK/NACK information.