Patent ID: 7852806

Claim:
A method for a user equipment (UE) to receive a PDCCH (physical downlink control channel) transmitted from a base station via a specific resource region, the method comprising: receiving a PBCH (physical broadcast channel), comprising system bandwidth information and PHICH (physical hybrid ARQ indicator channel) related information, the PHICH related information comprising first information associated with a number (GN) of at least one PHICH group per subframe and second information corresponding to a PHICH duration (m) indicating a number of OFDM symbols for the at least one PHICH group per subframe, from the base station, wherein one PHICH group of the at least one PHICH group consists of a plurality of PHICHs multiplexed by using orthogonal sequences; and receiving the PDCCH transmitted from the base station via the specific resource region for downlink control information, the specific resource region being selected among resource regions not being used for a PHICH transmission based on the first information and the second information.