Patent ID: 8254933

Claim:
An operating method of a base station of a border cell of a broadband wireless communication system for a handover between the broadband wireless communication system and a target heterogeneous communication system, the method comprising: when a terminal enters the border cell of the broadband wireless communication system, sending, by the base station, a message, requesting to measure a signal level of a downlink, to the terminal using a modem for the broadband wireless communication system; when a signal level measured by the terminal falls below a preset threshold, requesting, by the base station, a handover to the target heterogeneous communication system over a core network; receiving, by the base station, a message, including channel allocation information for acquiring an UpLink (UL) channel of the target heterogeneous communication system, from the target heterogeneous communication system; and forwarding, by the base station, the message, including the channel allocation information, to the terminal using the modem for the broadband wireless communication system.