Patent ID: 8611811

Claim:
A method of supporting ranging in a relay station (RS) which relays communication between a base station and a mobile station, the method comprising: receiving, from the mobile station, data to be relayed to the base station; determining ranging between the mobile station and the relay station is required when at least time synchronization exceeds a certain range in view of time between the mobile station and the RS or a frequency value allocated to the mobile station exceeds a certain offset value in view of frequency based on the received data to be relayed to the base station; and transmitting, to the base station, an indicator and at least one transmission parameter value if it is determined that the ranging between the mobile station and the relay station is required; wherein the at least one transmission parameter value is at least one transmission parameter adjustment value for ranging to the base station if the indicator is set to a first value, and wherein the at least one transmission parameter value is at least one threshold value of the at least one transmission parameter adjustment value if the indicator is set to a second value.