Patent ID: 7764649

Claim:
A system for providing handover in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system, comprising: a Base Station (BS) for dividing, according to symbols, a data transmission field that includes at least one subchannel allocable to at least one Mobile Station (MS) into a handover field that includes the at least one subchannel allocable to the at least one MS and a normal user field that includes the at least one subchannel allocable to the at least one MS, allocating at least one subchannel in the normal user field to at least one non-handover MS, and allocating at least one subchannel in the handover field to at least one handover MS using a distributed subcarrier allocation scheme; and an MS for communicating with the BS through the at least one subchannel in the handover field when the MS is located in a handover region during communication with the BS, wherein a frequency reuse factor of the at least one subchannel in the handover field is greater than 1 and a frequency reuse factor of the at least one subchannel in the normal user field is 1.