Patent ID: 7852825

Claim:
A method of determining whether attach procedures should be implemented based on Internet protocol (IP) version compatibility, the method comprising: storing a list of network identifiers; scanning a control channel, monitoring a plurality of network broadcast channels and selecting a network having an identifier that matches one of the stored identifiers, wherein the scanning, monitoring and selecting is performed by a processor; on a condition that more than one match occurs, processing additional stored priority information and selecting a first network having the highest priority; and on a condition that a match does not occur, continuing to scan the control channel; receiving a first network IP version message from a the first network over a first broadcast channel which includes a field having a plurality of bits representing a first packet data protocol (PDP) type, wherein the first network IP version message indicates the IP version that the first network supports; on a condition that the first PDP type of the first network is not compatible, based on the IP version message, with a second PDP type supported by a wireless transmit/receive unit (WTRU), receiving a signal from the first network directing the WTRU to a second network known to be compatible with the IP version of the WTRU or tuning to and monitoring other broadcast channels in the control channel until a second network IP version message is received from a second network over a second broadcast channel which includes a field having a plurality of bits representing the second PDP type, wherein the second network IP version message indicates the IP version that the second network supports; and implementing attach procedures to establish a communication link between the WTRU and the second network.