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The support for IP mobility has become very important with the increasing growth of mobile applications. One of the key challenges for the deployment of such wireless Internet infrastructure is to efficiently manage user mobility. Mobility is handled by Mobile IP (at the network layer) and Session Initiation Protocol (at the application layer). The main aim of these paper is to provide seamless connectivity for ongoing communications, that is, to keep the handover latency delay as less as possible. The delay constraint becomes even more crucial for real-time applications. The Mobile IP scheme has drawbacks like triangular routing, longer delays and the need for tunnelling management.
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