Patent ID: 8548378

Claim:
A mobile station which connects to a base station, the base station having a plurality of relays belonging thereto, and the mobile station comprising: a receiving unit which receives a plurality of first preamble signals from a plurality of first relays and receives a plurality of second preamble signals from a plurality of second relays, the first relays belonging to a first cluster including an N1 number of relays and the second relays belonging to a second cluster including an N2 number of relays; a control unit which selects the first cluster as an access cluster to connect to the base station, based on a sum of received power of the first preamble signals and a sum of received power of the second preamble signals; and a transmission unit which transmits an access request message to at least one relay among the first relays, wherein the access request message is transmitted to the base station via the at least one relay among the first relays.