Patent ID: 8548478

Claim:
A method implemented in a wireless transmit/receive unit (WTRU), the method comprising: the WTRU receiving a network information message via a cellular network while the WTRU is in either active mode or idle mode, wherein the network information message includes information related to a plurality of wireless access networks available for handoff, the information including a neighbor cell list that identifies the plurality of wireless access networks available for handoff, wherein the plurality of wireless access networks includes a first wireless access network based on a first wireless access technology and a second wireless access network based on a second wireless access technology, wherein the first wireless access technology and the second wireless access technology are different, and wherein the plurality of wireless access networks consists of wireless access networks in the vicinity of the WTRU; on a condition that the WTRU is in active mode, the WTRU performing physical measurements only on signals transmitted from the wireless access networks identified in the neighbor cell list, in response to receiving the neighbor cell list; the WTRU selecting one of the networks from the plurality of wireless access networks for handover; and the WTRU initiating a handover procedure with the selected network; and on a condition that the WTRU is in idle mode, the WTRU selecting one of the wireless access networks identified in the neighbor cell list using the received information related to the wireless access network and initiating a new call to the selected wireless access network.