Patent ID: 8134978

Claim:
A wireless transmit/receive unit (WTRU) comprising: 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, to send radio link status indications related to the first transceiver to the RIL MIH client, and to communicate with the first RIL proxy during active communication at the first transceiver; a RIL driver configured to communicate with the second transceiver, to send radio link status indications to the RIL MIH client, and to communicate directly with the second RIL proxy during active communication at the second transceiver; and an upper layer protocol stack; wherein the RIL MIH client is configured to: receive radio link status indications from the first RIL driver and the second RIL driver; initiate a radio level handover from the first transceiver to the second transceiver in order to establish a new radio link at the second transceiver; initiate an internet protocol (IP) level handover in response to establishment of the new radio link; and communicate 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.