Patent ID: 7916715

Claim:
A method of wireless communications by a wireless communication device, comprising: monitoring a first network in accordance with a first air interface on a first carrier frequency; configuring a filtering mechanism to allow for one or more message format types associated with messages from a second network to be communicated through the first air interface, the second network being associated with a second air interface different from the first air interface and operating on a second carrier frequency different from the first carrier frequency; receiving a message from the second network through the first air interface, if a message format type of the message is one of the one or more message format types configured to be allowed to be communicated through the first air interface; wherein the first network comprises a circuit-switched network and the second network comprises a packet-switched network; and wherein the second network comprises first and second geographic regions, the method further comprising detecting movement of the wireless communication device into the second geographic region from the first geographic region while monitoring the first network, and sending a request for an identifier to an access network in the second geographic region to support communications with the second network, the request being sent through the first air interface.