Patent ID: 7636571

Claim:
A method of allocating frequency for handover of a Subscriber Station (SS) for use of a frequency reuse factor of 1 or a frequency reuse factor approximating 1 in a communication system, the method comprising: receiving, by the SS, a frame in a first coverage of a serving Base Station (BS); detecting, by the SS, frequencies in the frame, when the SS is located in the first coverage and a second coverage of a target BS, and reporting to the serving BS the detected frequencies; and receiving a signal representing that the detected frequencies are determined safety channel frequencies used between the target BS and the SS; wherein the SS uses the detected frequencies together with the target BS, the target BS receives the safety channel frequencies, the target BS determines that the SS communicates data with the target BS using the safety channel frequencies until the handover ends, and the target BS varies the safety channel frequencies every predetermined number of frames, wherein the frame includes a preamble including a first preamble and a second preamble, the first preamble is used for transmitting, by the SS, information to measure a distance from the serving BS and a state of a channel between the SS and the serving BS, and the second preamble is used for transmitting, by the SS, data in frequencies except for the detected frequencies, in which data is not transmitted among frequencies included in the second preamble of the frame.