Integration of 802.21 media independent handover functionality to radio interface layer and telephony server

A wireless transmit/receive unit (WTRU) comprising:

• a media independent handover (MIH) client;
• a first transceiver of a first type of radio access technology (RAT), wherein the first RAT is a cellular RAT, and wherein the first transceiver includes a first device driver configured to send link status information to the MIH client;
• a second transceiver of a second type of RAT including a second device driver configured to send link status information to the MIH client;
• a call processing module;
• a device management module configured to communicate with the call processing module, to communicate with the first transceiver during active communication at the first transceiver, and to communicate with the second transceiver during active communication at the second transceiver;
• a network management module configured to communicate with the MIH client and the first and second transceivers;
• a layer 3 protocol module including a mobile internet protocol (MIP) and a session initiation protocol (SIP) configured to communicate with the network management module, the MIH client and a socket layer;
• and
• an AT command interface configured to communicate with the first transceiver and the device management module;
• wherein the link status information sent by the first device driver to the MIH client is sent via the AT command interface;
• and
• wherein the MIH client is configured to:
• trigger a radio level handover in order to establish a new radio link,
• wherein the radio level handover is from the first transceiver to the second transceiver or from the second transceiver to the first transceiver;
• establish an internet protocol (IP) and a point-to-point (PPP) connection using the new radio link;
• initiate a handover of an active MIP session;
• and
• communicate to the call processing module that the new radio link is ready for use in response to a completion of the handover of the active MIP session.

A method for use in a wireless transmit/receive unit (WTRU), wherein the WTRU includes

• a first transceiver configured to communicate using a first radio access technology (RAT),
• a second transceiver configured to communicate using a second RAT,
• at least two radio interface layer (RIL) proxies configured to implement RIL application functions, wherein the at least two RIL proxies include a first RIL proxy and a second RIL proxy,
• a RIL media independent handover (RIL MIH) client,
• a first RIL driver configured to communicate with the first transceiver and the first RIL proxy,
• a second RIL driver configured to communicate with the second transceiver and the second RIL proxy,
• the method comprising:
• the RIL MIH client receiving radio link status indications from the first RIL driver and the second RIL driver;
• the RIL MIH client initiating a radio level handover in order to establish a new radio link;
• the RIL MIH client initiating an internet protocol (IP) level handover in response to establishment of the new radio link;
• and
• the RIL MIH client communicating to the at least two RIL proxies that the new radio link is ready for use in response to completion of the IP level handover.