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With the proliferation of multiple wireless technologies and Smartphones with enhanced radio capabilities, it has become imperative to deliver services that can work seamlessly across heterogeneous networks. As Smartphones advance in their capabilities, there is an increasing adoption of services with real-time delivery constraints (e.g. video telephony, streaming). In a heterogeneous network environment, latencies during handoff across networks becomes a critical impediment for delivery of real-time services. An important contributor to the hand-off latency is the authentication of a mobile node with the target domain.
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