Patent ID: 8036663

Claim:
A handover control method for a broadband wireless access system supporting multiple frequency allocations, wherein a serving base station controls an inter-frequency and inter-base station handover from the serving base station to a handover target base station, the handover control method comprising: transmitting, by the serving base station to mobile subscriber stations that are within an area of the serving base station, a network topology advertisement message comprising information for a plurality of neighbor base stations supporting at least two frequency allocations, wherein the plurality of neighbor base stations includes the handover target base station supporting the at least two frequency allocations; receiving, at the serving base station, a handover request message from a mobile subscriber station among the mobile subscriber stations within the area of the serving base station, wherein the handover request message includes an identifier of the mobile subscriber station; transmitting, from the serving base station, a handover request notification message to the handover target base station supporting the at least two frequency allocations, wherein the handover request notification message includes the identifier of the mobile subscriber station, connection parameters, capability, required bandwidth and information for quality of service, and wherein the handover target base station selects a frequency allocation among the at least two frequency allocations based on the identifier of the mobile subscriber station, the connection parameters, the capability, the required bandwidth and the information for quality of service; receiving, at the serving base station, a handover request notification response message from the handover target base station; transmitting, from the serving base station, a handover confirmation message to the handover target base station in response to the handover request notification response message, wherein the handover confirmation message identifies the selected frequency allocation that will be used by the mobile subscriber station in the handover; and transmitting, from the serving base station, a handover response message to the mobile subscriber station, wherein the handover request notification response message and the handover response message comprise information identifying the selected frequency allocation.