Patent ID: 8897205

Claim:
A mobile communication system comprising: a base station; a mobile station; and a relay station relaying radio communications between the base station and the mobile station, wherein the mobile station includes a transmitter configured to transmit a random access request to the base station, wherein the relay station includes a transmission information acquisition unit configured to receive a random access response transmitted from the base station in response to the random access request, and acquire transmission information of a connection establishment request to be transmitted by the mobile station out of the received random access response, and a relay report unit configured to receive the connection establishment request from the mobile station based on the transmission information, measure a received state of the received connection establishment request, and transmit relay information including measurement information of the received state to the base station after the random access response is received from the base station by the transmission information acquisition unit, and wherein the base station includes a comparison determinator configured to compare a received state of the connection establishment request received and measured by the base station with the measurement information of the received state included in the relay information received from the relay station, and determine whether the relay station is used to relay radio communications with the mobile station.