Method and apparatus for harq-ack transmission in traffic adaptive tdd system

Abstract

A method and an apparatus are provided for HARQ-ACK feedback information transmission in a traffic adaptive TDD system. The method includes obtaining a resource indicator and power control information in a physical downlink control channel (PDCCH) scheduling a physical downlink shared channel (PDSCH); identifying at least one physical uplink control channel (PUCCH) resource indicated by the obtained resource indicator; controlling power based on the obtained power control information; and transmitting the HARQ-ACK information in the identified at least one PUCCH resource using the controlled power.

What is claimed is: 
     
         1 . A method for transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) information by a user equipment (UE) in a time division duplexing (TDD) system, the method comprising:
 obtaining a resource indicator and power control information in a physical downlink control channel (PDCCH) scheduling a physical downlink shared channel (PDSCH);   identifying at least one physical uplink control channel (PUCCH) resource indicated by the obtained resource indicator;   controlling power based on the obtained power control information; and   transmitting the HARQ-ACK information in the identified at least one PUCCH resource using the controlled power.   
     
     
         2 . The method of  claim 1 , wherein transmit power control (TPC) information included in control information received in the PDCCH is used as the resource indicator. 
     
     
         3 . The method of  claim 2 , wherein the TPC information is included in the control information on all downlink subframes in the PDCCH scheduling the PDSCH. 
     
     
         4 . The method of  claim 1 , wherein the HARQ-ACK information is transmitted using one of a PUCCH format 3 or a PUCCH format 1a/1b. 
     
     
         5 . A method for receiving hybrid automatic repeat request-acknowledgement (HARQ-ACK) information by a base station (BS) in a time division duplexing (TDD) system, the method comprising:
 transmitting, to a user equipment (UE), a resource indicator for indicating at least one physical uplink control channel (PUCCH) resource and power control information in a physical downlink control channel (PDCCH) scheduling a physical downlink shared channel (PDSCH); and   receiving, from the UE, the HARQ-ACK information in the at least one PUCCH resource indicated by the resource indicator,   wherein the HARQ-ACK information is transmitted from the UE using power that is controlled based on the power control information.   
     
     
         6 . The method of  claim 5 , wherein transmit power control (TPC) information included in control information transmitted in the PDCCH is used as the resource indicator. 
     
     
         7 . The method of  claim 6 , wherein the TPC information is included in the control information on all downlink subframes in the PDCCH scheduling the PDSCH. 
     
     
         8 . The method of  claim 5 , wherein the HARQ-ACK information is received using one of a PUCCH format 3 or a PUCCH format 1a/1b. 
     
     
         9 . A user equipment (UE) in a time division duplexing (TDD) system, the UE comprising:
 a transceiver; and   at least one processor configured to:
 obtain a resource indicator and power control information in a physical downlink control channel (PDCCH) scheduling a physical downlink shared channel (PDSCH), 
 identify at least one physical uplink control channel (PUCCH) resource indicated by the obtained resource indicator, 
 control power based on the obtained power control information, and 
 control the transceiver to transmit hybrid automatic repeat request-acknowledgement (HARQ-ACK) information in the identified at least one PUCCH resource using the controlled power. 
   
     
     
         10 . The UE of  claim 9 , wherein transmit power control (TPC) information included in control information received in the PDCCH is used as the resource indicator. 
     
     
         11 . The UE of  claim 10 , wherein the TPC information is included in the control information on all downlink subframes in the PDCCH scheduling the PDSCH. 
     
     
         12 . The UE of  claim 9 , wherein the HARQ-ACK information is transmitted using one of a PUCCH format 3 or a PUCCH format 1a/1b. 
     
     
         13 . A base station (BS) in a time division duplexing (TDD) system, the BS comprising:
 a transceiver; and   at least one processor configured to control the transceiver to:
 transmit, to a user equipment (UE), a resource indicator for indicating at least one physical uplink control channel (PUCCH) resource and power control information in a physical downlink control channel (PDCCH) scheduling a physical downlink shared channel (PDSCH), and 
 receive, from the UE, hybrid automatic repeat request-acknowledgement (HARQ-ACK) information in the at least one PUCCH resource indicated by the resource indicator, 
   wherein the HARQ-ACK information is transmitted from the UE using power that is controlled based on the power control information.   
     
     
         14 . The BS of  claim 13 , wherein transmit power control (TPC) information included in control information transmitted in the PDCCH is used as the resource indicator. 
     
     
         15 . The BS of  claim 14 , wherein the TPC information is included in the control information on all downlink subframes in the PDCCH scheduling the PDSCH. 
     
     
         16 . The BS of  claim 13 , wherein the HARQ-ACK information is received using one of a PUCCH format 3 or a PUCCH format 1a/1b.