Patent ID: 8554223

Claim:
A femtocell, a wireless network system comprising a server, a mobile device, a BS and the femtocell, the wireless network system conforming to the WiMAX standard, the femtocell comprising: a wired network interface, connecting to the BS and being configured to receive a monitoring signal which carries a connection ID of the mobile device from the BS; a first wireless network interface, being configured to receive an UL-MAP message which carries a resource configuration message corresponding to the connection ID from the BS, monitor the mobile device on an operating frequency according to the connection ID and the resource configuration message and detect a signal transmitted by the mobile device; and a second wireless network interface; wherein upon detecting the signal, the first wireless network interface stops monitoring the mobile device, the wired network interface transmits a response signal corresponding to the monitoring signal to the BS so that the BS transmits a handover signal to the mobile device after receiving the response signal, the handover signal is for directing the mobile device to handover to the femtocell so as to connect to the second wireless network interface.