A method for allocating a frequency to a subscriber station (SS) in handover operation in an Orthogonal Frequency Division Multiple Access (OFDMA) system. In the method, the SS checks safety channel frequencies for a target base station (BS), generates a safety channel frequency request message for requesting...http://www.google.de/patents/US20050197132?utm_source=gb-gplus-sharePatent US20050197132 - Method and apparatus for allocating channels in an orthogonal frequency division multiple access system
