5G: Service Continuity in Heterogeneous Environments
Wireless Personal Communications: An International Journal
TRIM: An architecture for transparent IMS-based mobility
Computer Networks: The International Journal of Computer and Telecommunications Networking
The multimedia service session handoff method in heterogeneous wireless networks
International Journal of Grid and Utility Computing
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In some areas, overlapping networks provide alternative wireless links like WLAN, GSM, 3G etc. Ideally, the user should be connected to the most attractive network any time according to predefined priorities. This is accomplished with automatic handover. The most likely commercial application of this type is designed for speech, and is using SIP to set up VoIP calls through WLAN networks or mobile networks. To make the handover time as short as possible is essential to make it attractive. This is best done by preparing the alternative networks before the handover is needed. This is called proactive handover. This paper suggests changes to some of the basic SIP messages that open for proactive handover in SIP and help reduce the delays when roaming.