Communication method and apparatus for carrier aggregation system

Abstract

Embodiments of the present invention provide a communication method for a carrier aggregation system. The communication method includes receiving physical downlink share channel PDSCH information sent by a base station through a subframe n of a secondary cell. If a subframe n of a primary cell is a downlink subframe, an ACK/NACK of the sent PDSCH information is fed back on a subframe m or a subframe p of the primary cell.

What is claimed is: 
     
         1 . A communication method for carrier aggregation of time division duplexing (TDD) and frequency division duplexing (FDD), comprising:
 receiving, by a user equipment (UE), downlink information from a base station through a subframe n of a secondary cell; and   feeding back, by the UE, an ACK/NACK of the downlink information on a subframe m of a primary cell;   wherein n and m are subframe indexes;   wherein a subframe n of the primary cell comprises a downlink subframe; and   wherein an index value of the subframe m of the primary cell is equal to an index value of an uplink subframe which is determined according to an ACK/NACK timing relationship to which the subframe n of the primary cell corresponds.   
     
     
         2 . The communication method according to  claim 1 , wherein the downlink information is physical downlink shared channel (PDSCH) information. 
     
     
         3 . The communication method according to  claim 2 , further comprising:
 receiving, by the UE, physical downlink control channel (PDCCH) information sent by the base station through the subframe n of the primary cell, wherein the PDCCH information is used to schedule the PDSCH information.   
     
     
         4 . The communication method according to  claim 1 , wherein when the primary cell is in UL-DL configuration 2, the ACK/NACK timing relationship comprises an uplink subframe 2 being used to feed back an uplink ACK/NACK of downlink subframes 4, 5, 6 and 8. 
     
     
         5 . The communication method according to  claim 1 , wherein when the primary cell is in UL-DL configuration 2, the ACK/NACK timing relationship comprises an uplink subframe 7 being used to feed back an uplink ACK/NACK of downlink subframes 0, 1, 3 and 9. 
     
     
         6 . The communication method according to  claim 5 , wherein when the primary cell is in UL-DL configuration 2, the ACK/NACK timing relationship comprises an uplink subframe 2 being used to feed back an uplink ACK/NACK of downlink subframes 4, 5, 6 and 8. 
     
     
         7 . A user equipment supporting carrier aggregation of time division duplexing (TDD) and frequency division duplexing (FDD), comprising:
 a receiver, configured to receive downlink information sent by a base station through a subframe n of a secondary cell; and   a processor, configured to feed back an ACK/NACK of the downlink information on a subframe m of a primary cell;   wherein n and m are subframe indexes;   wherein a subframe n of the primary cell comprises a downlink subframe; and   wherein an index value of the subframe m of the primary cell is equal to an index value of an uplink subframe which is determined according to an ACK/NACK timing relationship to which the subframe n of the primary cell corresponds.   
     
     
         8 . The user equipment according to  claim 7 , wherein the downlink information is physical downlink shared channel (PDSCH) information. 
     
     
         9 . The user equipment according to  claim 8 , wherein the receiver is further configured to receive physical downlink control channel (PDCCH) information sent by the base station through the subframe n of the primary cell, wherein the PDCCH information is used to schedule the PDSCH information. 
     
     
         10 . The user equipment according to  claim 7 , wherein when the primary cell is in UL-DL configuration 2, the ACK/NACK timing relationship comprises an uplink subframe 2 being used to feed back an uplink ACK/NACK of downlink subframes 4, 5, 6 and 8. 
     
     
         11 . The user equipment according to  claim 7 , wherein when the primary cell is in UL-DL configuration 2, the ACK/NACK timing relationship comprises an uplink subframe 7 being used to feed back an uplink ACK/NACK of downlink subframes 0, 1, 3 and 9. 
     
     
         12 . The user equipment according to  claim 11 , wherein when the primary cell is in UL-DL configuration 2, the ACK/NACK timing relationship comprises an uplink subframe 2 being used to feed back an uplink ACK/NACK of downlink subframes 4, 5, 6 and 8. 
     
     
         13 . A user equipment supporting carrier aggregation of time division duplexing (TDD) and frequency division duplexing (FDD), comprising:
 a receiver, configured to receive downlink information sent by a base station through a subframe n of a secondary cell; and   a processor, configured to feed back an ACK/NACK of the downlink information on a preset uplink subframe of a primary cell;   wherein a subframe n of the primary cell is an uplink subframe;   wherein a subframe p of the primary cell is a downlink subframe;   wherein n and p are subframe indexes; and   wherein the index value of the subframe p of the primary cell is equal to an index value of an uplink subframe which is determined according to an ACK/NACK timing relationship to which the subframe n of the secondary cell corresponds.   
     
     
         14 . The user equipment according to  claim 13 , wherein the downlink information is physical downlink shared channel (PDSCH) information.