Patent ID: 8792327

Claim:
A method for transmitting a control format indicator channel for a backhaul link between a base station (BS) and a relay node (RN) by the BS of a wireless communication system, the method comprising: generating a relay physical control format indicator channel (R-PCFICH) including information of a relay physical downlink control channel (R-PDCCH) region, the R-PDCCH region being included in a data region of a downlink subframe; and transmitting the R-PCFICH through a first OFDM symbol of the R-PDCCH region; wherein the R-PCFICH includes information regarding the number of OFDM symbols contained in the R-PDCCH region; wherein the R-PCFICH is distributed and mapped on a frequency axis of the first OFDM symbol of the R-PDCCH region at a predetermined interval; and wherein the R-PCFICH carries an indicator (A) for indicating the information regarding the number of OFDM symbols contained in the R-PDCCH region, wherein correspondence between the indicator (A) and OFDM symbols contained in the R-PDCCH region is defined by a table as follows: TABLE OFDM symbols for the R- OFDM symbols for indicator PDCCH region (in units of 2 the R-PDCCH region (A) OFDM symbols) (in units of 3 OFDM symbols) 0 3 rd and 4 th OFDM symbols 3 rd , 4 th and 5 th OFDM symbols 1 5 th and 6 th OFDM symbols 6 th , 7 th and 8 th OFDM symbols 2 7 th and 8 th OFDM symbols All symbols 3 All symbols reserved.