Patent ID: 7151931
Filing Date: 2006-12-19
Classification: H04W

Abstract:
1. A method enabling roaming between different wireless networks, for a mobile device supporting a first wireless network standard and a second wireless network standard adapted to roam between a first wireless network and a second wireless network, the method comprising the steps of: linking to establish bidirectional communication between the mobile device and a host through the first wireless network and to deliver a plurality of data packets between the mobile device and the host through the first wireless network; delivering a plurality of control signals to maintain a link between the mobile device and the first wireless network via a virtual GPRS support node after the mobile device roaming from the first wireless network to the second wireless network; bidirectional communication via the virtual GPRS support node, to deliver a plurality of data packets between low and high-tier wireless networks; returning, wherein the mobile device roams from the second wireless network to the routing area of the first wireless network; recovering the link between the mobile device and the first wireless network using original routing information and notifying the virtual GPRS support node to stop delivery of the data packets if the routing area is the same as an original routing area hosting the mobile device before roaming; and restarting to establish a link between the mobile device and the first wireless network using original routing information obtained from a Serving GPRS support node (SGSN) of the original routing area, notifying the SGSN of the RA to handling the delivery of the data packets, and notifying the virtual GPRS support node to stop delivery of the data packets if the routing area is different from the original routing area hosting the mobile device before roaming; wherein the first wireless network has lower bandwidth but more mobility than the second wireless network.