RECEIVING CONTROL INFORMATION THROUGH PDCCH

摘要

A method for efficiently transmitting and receiving control information through a Physical Downlink Control Channel (PDCCH) is provided. When a User Equipment (UE) receives control information through a PDCCH, the received control information is set to be decoded in units of search spaces, each having a specific start position in the specific subframe. Here, a modulo operation according to a predetermined first constant value (D) is performed on an input value to calculate a first result value, and a modulo operation according to a predetermined first variable value (C) corresponding to the number of candidate start positions that can be used as the specific start position is performed on the calculated first result value to calculate a second result value and an index position corresponding to the second result value is used as the specific start position. Transmitting control information in this manner enables a plurality of UEs to efficiently receive PDCCHs without collisions.

主权项

1. A user equipment (UE) for decoding control information, the UE comprising:
a receiver configured to receive, from a base station, subframes with control regions including a Physical Downlink Control Channel (PDCCH); a decoder configured to decode control information within a UE-specific search space of the PDCCH, wherein the UE-specific search space of the PDCCH has different locations among different UEs, and wherein the UE is configured to determine a location of the UE-specific search space of the PDCCH based on an identifier associated with the UE and a time-varying subframe identifier.