Patent ID: 7925207
Filing Date: 2011-04-12
Classification: H04B

Abstract:
1. A ranging control method of a relay station in a communication system, the method comprising: receiving a ranging sequence from at least one mobile station; estimating a timing offset indicative of a difference between a reception time of the received ranging sequence and a reference time; regenerating a ranging sequence corresponding to the at least one mobile station using the received ranging sequence, and adding up the regenerated ranging sequence and a reference sequence; and transmitting the added sequence to the at least one mobile station taking into account at least one of a time that a base station desires to receive a signal, a signal delay time between the base station and the relay station, a base station reference time, and a relay station reference; wherein regenerating a ranging sequence comprises decoding the received ranging sequence, detecting an error from the decoded ranging sequence, and if the error is detected from the decoded ranging sequence, regenerating the ranging sequence by re-encoding the decoded ranging sequence.