Method for repetitive transmission of channel for coverage extension, and terminal

Abstract

A method of operating a device includes receiving a radio resource control (RRC) signal including first information representing at least one repetition level, among a plurality of repetition levels of a physical downlink shared channel (PDSCH), receiving, via a downlink control channel, downlink control information (DCI) including an index, and receiving the repetitions of the PDSCH over a number of subframes.

What is claimed is: 
     
         1 . A method of operating a device, comprising:
 receiving a radio resource control (RRC) signal including first information representing at least one repetition level, among a plurality of repetition levels of a physical downlink shared channel (PDSCH),   wherein the at least one repetition level in the first information of the RRC signal represents a set of plural repetition numbers of the PDSCH; and   receiving, via a downlink control channel, downlink control information (DCI) including an index,   wherein the index is expressed as one value of {0, 1, 2, . . . , N−1}, where N is a size of the set, and   wherein the one value represents one in the set of plural repetition numbers of the PDSCH which are indicated by the at least one repetition level in the RRC signals; and   receiving the repetitions of the PDSCH over a number of subframes,   wherein the number of subframes for the repetitions of the PDSCH is determined, based on both of the set of plural repetition numbers of the PDSCH indicated by the at least one repetition level in the RRC signals and the one value of the index included in the downlink control channel.   
     
     
         2 . The method of  claim 1 , further comprising:
 receiving a system information block (SIB) including second information used to indicate valid downlink subframes used for repetitions of the downlink control channel and for repetitions of the PDSCH,   wherein the valid downlink subframes indicated by the second information in the SIB do not include a multicast-broadcast single-frequency network (MBSFN) subframe, and   wherein the MBSFN subframe is not the valid downlink subframes used for repetitions of the downlink control channel and for the repetitions of the PDSCH.   
     
     
         3 . The method of  claim 1 , wherein the downlink control channel is not repeatedly received on a time division duplex (TDD) special subframe. 
     
     
         4 . The method of  claim 1 , further comprising:
 determining a last subframe, on which repetitions of the downlink control channel are completed; and   determining a start subframe to receive repetitions of the PDSCH, based on the last subframe.   
     
     
         5 . The method of  claim 1 , wherein the RRC signals further include information specifying a repetition level of a physical uplink shared channel (PUSCH). 
     
     
         6 . The method of  claim 5 , further comprising:
 receiving repetitions of a second downlink control channel,   wherein the second downlink control channel includes information on an index indicating one among repetition numbers of the PUSCH based on the repetition level of the PUSCH specified in the RRC signals; and   determining a repetition number of the PUSCH, among the repetition numbers, based on the index in the second downlink control channel.   
     
     
         7 . The method of  claim 1 , wherein the downlink control channel including the index has a specific downlink control information (DCI) format. 
     
     
         8 . The method of  claim 1 , further comprising:
 transmitting a physical uplink control channel (PUCCH) signal which is repeated over a plurality of uplink subframes,   wherein an uplink transmission power for the PUCCH signal is fixed during the repetition over the plurality of uplink subframes.   
     
     
         9 . The method of  claim 1 , wherein the RRC signals further include information used to determine a location of a start subframe where repetitions of the downlink control channel are to be started. 
     
     
         10 . A device comprising:
 a transceiver; and   a processor operably connectable to the transceiver,   wherein the processer is configured to:   receive a radio resource control (RRC) signal including first information representing at least one repetition level, among a plurality of repetition levels of a physical downlink shared channel (PDSCH),   wherein the at least one repetition level in the first information of the RRC signal represents a set of plural repetition numbers of the PDSCH, and   receive, via a downlink control channel, downlink control information (DCI) including an index,   wherein the index is expressed as one value of {0, 1, 2, . . . , N−1}, where N is a size of the set, and   wherein the one value represents one in the set of plural repetition numbers of the PDSCH which are indicated by the at least one repetition level in the RRC signals, and   receive the repetitions of the PDSCH over a number of subframes,   wherein the number of subframes for the repetitions of the PDSCH is determined, based on both of the set of plural repetition numbers of the PDSCH indicated by the at least one repetition level in the RRC signals and the one value of the index included in the downlink control channel.   
     
     
         11 . The device of  claim 10 , wherein the processor is further configured to:
 receive a system information block (SIB) including second information used to indicate valid downlink subframes used for repetitions of the downlink control channel and for repetitions of the PDSCH,   wherein the valid downlink subframes indicated by the second information in the SIB do not include a multicast-broadcast single-frequency network (MBSFN) subframe, and   wherein the MBSFN subframe is not the valid downlink subframes used for repetitions of the downlink control channel and for the repetitions of the PDSCH.   
     
     
         12 . The device of  claim 10 , wherein the downlink control channel is not repeatedly received on a time division duplex (TDD) special subframe. 
     
     
         13 . The device of  claim 10 , wherein the processor is further configured to:
 determine a last subframe, on which repetitions of the downlink control channel are completed; and   determine a start subframe to receive repetitions of the PDSCH, based on the last subframe.   
     
     
         14 . The device of  claim 10 , wherein the RRC signals further include information specifying a repetition level of a physical uplink shared channel (PUSCH). 
     
     
         15 . The device of  claim 14 , wherein the processor is further configured to:
 receive repetitions of a second downlink control channel,   wherein the second downlink control channel includes information on an index indicating one among repetition numbers of the PUSCH based on the repetition level of the PUSCH specified in the RRC signals, and   determine a repetition number of the PUSCH, among the repetition numbers, based on the index in the second downlink control channel.   
     
     
         16 . The device of  claim 10 , wherein the downlink control channel including the index has a specific downlink control information (DCI) format. 
     
     
         17 . The device of  claim 10 , wherein the processor is further configured to:
 transmit a physical uplink control channel (PUCCH) signal which is repeated over a plurality of uplink subframes,   wherein an uplink transmission power for the PUCCH signal is fixed during the repetition over the plurality of uplink subframes.   
     
     
         18 . The device of  claim 10 , wherein the RRC signals further include information used to determine a location of a start subframe where repetitions of the downlink control channel are to be started.