Patent ID: 8743819

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 information related to a system bandwidth, first information related to a specific constant, and second information related to a duration of a PHICH (physical hybrid ARQ indicator channel) per subframe, wherein the duration of the PHICH indicates a number of OFDM (orthogonal frequency division multiplexing) symbols to which the PHICH is mapped; receiving the PDCCH transmitted from the base station via the specific resource region for downlink control information, wherein the specific resource region is determined among resource regions not being used for the PHICH transmission, and wherein the specific resource region is within a resource region having a prescribed number of OFDM symbols that is equal to or greater than the number of OFDM symbols corresponding to the duration of the PHICH in a time domain starting from a first OFDM symbol of each subframe; determining a value by multiplying a basic number predetermined according to the system bandwidth by the specific constant; and determining resource regions used for the PHICH transmission based on the determined value and the duration of the PHICH.