Method and apparatus for supporting HARQ

Abstract

A method of supporting Hybrid Automatic Repeat Request (HARQ) includes receiving an initial uplink grant on a downlink channel, transmitting uplink data on an uplink channel using the initial uplink grant, receiving a request for retransmission of the uplink data, determining at least one transmission parameter of a channel quality indicator (CQI) from the initial uplink grant, multiplexing retransmission data of the uplink data with the CQI, and transmitting the multiplexed data on the uplink channel. Amount of resources for transmission of the CQI is determined based on the at least one transmission parameter.

What is claimed is: 
     
       1. A method for supporting retransmission in a wireless communication system, the method performed by a user equipment (UE) and comprising:
 receiving a channel quality indicator (CQI) request from a base station; 
 multiplexing retransmission data of an initial uplink data with a CQI channel quality indicator (CQI); and 
 transmitting the multiplexed data on a physical uplink shared channel (PUSCH) to a base station, 
 wherein a radio resource for the CQI is determined based on a transmission parameter including information on an allocated resource used for transmission of the initial uplink data. 
 
     
     
       2. The method of  claim 1 , wherein the CQI is an aperiodic CQI. 
     
     
       3. The method of  claim 1 , further comprising:
 receiving an initial uplink grant on a physical downlink control channel (PDCCH), 
 wherein the initial uplink grant is used for the initial uplink data. 
 
     
     
       4. The method of  claim 1 , further comprising:
 receiving a CQI request from the base station,  
 wherein the CQI request is used to trigger transmission of the CQI from the UE. 
 
     
     
       5. The method of  claim 1 , further comprising:
 receiving a retransmission uplink grant on a PDCCH, 
 wherein the multiplexed data is transmitted based on a radio resource which is determined based on the retransmission uplink grant. 
 
     
     
       6. A user equipment (UE) supporting retransmission in a wireless communication system, the UE comprising:
 a radio frequency unit transmitting and receiving a radio signal; and 
 a processor coupled to the radio frequency unit and configured for: 
 receiving a channel quality indicator (CQI) request from a base station; 
 multiplexing retransmission data of an initial uplink data with a CQI channel quality indicator (CQI); and 
 transmitting the multiplexed data on a physical uplink shared channel (PUSCH) to a base station, 
 wherein a radio resource for the CQI is determined based on a transmission parameter including information on an allocated resource used for transmission of the initial uplink data. 
 
     
     
       7. The UE of  claim 6 , wherein the CQI is an aperiodic CQI. 
     
     
       8. The UE of  claim 6 , wherein the processor is further configured for:
 receiving an initial uplink grant on a physical downlink control channel (PDCCH), 
 wherein the initial uplink grant is used for the initial uplink data. 
 
     
     
       9. The UE of  claim 6 , wherein the processor is further configured for:
 receiving a CQI request from the base station,  
 wherein the CQI request is used to trigger transmission of the CQI from the UE. 
 
     
     
       10. The UE of  claim 6 , wherein the processor is further configured for:
 receiving a retransmission uplink grant on a PDCCH, 
 wherein the multiplexed data is transmitted based on a radio resource which is determined based on the retransmission uplink grant. 
 
     
     
       11. A method for supporting retransmission in a wireless communication system, the method performed by a base station (BS) and comprising:
 transmitting a channel quality indicator (CQI) request to a user equipment (UE); and 
 receiving multiplexed data on a physical uplink shared channel (PUSCH) from the UE, 
 wherein the multiplexed data includes retransmission data of an initial uplink data with a CQI, 
 wherein a radio resource for the CQI is determined based on a transmission parameter including information on an allocated resource used for transmission of the initial uplink data. 
 
     
     
       12. The method of  claim 11 , wherein the CQI is an aperiodic CQI. 
     
     
       13. The method of  claim 11 , further comprising:
 transmitting an initial uplink grant on a physical downlink control channel (PDCCH), 
 wherein the initial uplink grant is used for the initial uplink data. 
 
     
     
       14. The method of  claim 11 , wherein the CQI request is used to trigger transmission of the CQI from the UE. 
     
     
       15. The method of  claim 11 , further comprising:
 transmitting a retransmission uplink grant on a PDCCH, 
 wherein the multiplexed data is transmitted based on a radio resource which is determined based on the retransmission uplink grant. 
 
     
     
       16. A base station (BS) supporting retransmission in a wireless communication system, the BS comprising:
 a radio frequency unit transmitting and receiving a radio signal; and 
 a processor coupled to the radio frequency unit and configured for: 
 transmitting a channel quality indicator (CQI) request to a user equipment (UE); and 
 receiving multiplexed data on a physical uplink shared channel (PUSCH) from the UE, 
 wherein the multiplexed data includes retransmission data of an initial uplink data with a CQI, 
 wherein a radio resource for the CQI is determined based on a transmission parameter including information on an allocated resource used for transmission of the initial uplink data. 
 
     
     
       17. The BS of  claim 16 , wherein the CQI is an aperiodic CQI. 
     
     
       18. The BS of  claim 16 , wherein the processor is further configured for:
 transmitting an initial uplink grant on a physical downlink control channel (PDCCH), 
 wherein the initial uplink grant is used for the initial uplink data. 
 
     
     
       19. The BS of  claim 16 , wherein the CQI request is used to trigger transmission of the CQI from the UE. 
     
     
       20. The BS of  claim 16 , wherein the processor is further configured for:
 transmitting a retransmission uplink grant on a PDCCH, 
 wherein the multiplexed data is transmitted based on a radio resource which is determined based on the retransmission uplink grant. 
 
     
     
       21. A method for supporting retransmission in a wireless communication system, the method performed by a user equipment (UE) and comprising:
 performing an initial transmission of uplink data to a base station, based on at least one initial transmission parameter related to a first allocated resource for the initial transmission of the uplink data;   receiving a channel quality indicator (CQI) request from the base station; and   performing a retransmission of the uplink data which is multiplexed with a CQI,   wherein performing the retransmission of the uplink data which is multiplexed with the CQI comprises:
 multiplexing the uplink data with the CQI, based on receiving the CQI request; and 
 transmitting the uplink data multiplexed with the CQI on a physical uplink shared channel (PUSCH) to the base station, 
 wherein the uplink data is multiplexed based on at least one retransmission parameter related to a second allocated resource for the retransmission of the uplink data, and 
 wherein the CQI is multiplexed based on the at least one initial transmission parameter related to the first allocated resource for the initial transmission of the uplink data.  
   
     
     
       22. The method of  claim 21 , wherein the CQI is an aperiodic CQI.  
     
     
       23. The method of  claim 21 , further comprising:
 receiving, on a physical downlink control channel (PDCCH), an initial uplink grant for the initial transmission of the uplink data,   wherein the at least one initial transmission parameter is determined based on the initial uplink grant.    
     
     
       24. The method of  claim 21 , wherein the CQI request is used to trigger transmission of the CQI from the UE.  
     
     
       25. The method of  claim 21 , further comprising:
 receiving, on a PDCCH, a retransmission uplink grant for the retransmission of the uplink data,   wherein the at least one retransmission parameter is determined based on the retransmission uplink grant.    
     
     
       26. The method of  claim 21 , wherein the at least one initial transmission parameter comprises at least one of (i) a parameter related to a size of a resource region, (ii) a parameter related to a modulation order, or (iii) a parameter related to a coding scheme for the initial transmission of the uplink data.  
     
     
       27. The method of  claim 21 , wherein the at least one retransmission parameter comprises at least one of (i) a parameter related to a size of a resource region, (ii) a parameter related to a modulation order, or (iii) a parameter related to a coding scheme for the retransmission of the uplink data.  
     
     
       28. The method of  claim 21 , wherein the at least one initial transmission parameter comprises first resource allocation information for the initial transmission of the uplink data, and
 wherein the at least one retransmission parameter comprises second resource allocation information for the retransmission of the uplink data.