Patent ID: 7894400

Claim:
A method implemented in a wireless transmit/receive unit (WTRU) for performing handover between an IEEE 802.16 network and a universal mobile telecommunication system (UMTS) network using IEEE 802.21 media independent handover (MIH) functions, the method comprising: an MIH entity requesting an IEEE 802.16 modem to establish an IEEE 802.16 link via a first application programming interface (API); the IEEE 802.16 modem reporting a status of an attempt to establish an IEEE 802.16 link to the MIH entity via a second API; if the status indicates that an IEEE 802.16 link has been successfully established, the MIH entity starting an MIH session; the IEEE 802.16 modem indicating that a layer 2 connection is expected be terminated in a certain time interval via a third API to the MIH entity; and the MIH entity activating a UMTS modem for handover.