Patent ID: 8797935

Claim:
A method of performing a random access at a relay node in a mobile communication system, the method comprising: a) transmitting a random access preamble in a specific subframe to a base station; b) if the random access preamble is a dedicated preamble, monitoring a Relay-Physical Downlink Control Channel (R-PDCCH) in a data region of a Multicast Broadcast over a Single Frequency Network (MBSFN) subframe, and receiving a random access response included in a Relay-Physical Downlink Shared Channel (R-PDSCH) in the data region of the MBSFN subframe based on the R-PDCCH from the base station; and c) if the random access preamble is a non-dedicated preamble, monitoring a Physical Downlink Control Channel (PDCCH) in a control region of a non-Multicast Broadcast over a Single Frequency Network (non-MBSFN) subframe, and receiving the random access response included in a Physical Downlink Shared Channel (PDSCH) in the data region of the non-MBSFN subframe based on the PDCCH from the base station, wherein the MBSFN subframe and the non-MBSFN subframe are located within a predetermined window after the specific subframe, and wherein the starting subframe of the predetermined window for the MBSFN subframe is different from the starting subframe of the predetermined window for the non-MBSFN subframe.