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The convergence of heterogeneous wireless access technologies characterizes the 4G wireless networks. In such converged systems, the seamless and efficient handoff between different access technologies (vertical handoff) is essential and remains a challenging problem. The heterogeneous co-existence of access technologies with largely different characteristics creates a decision problem of determining the "Best" available network at "Best" time to reduce the unnecessary handoffs. This paper proposes a dynamic decision model to decide the "Best" network at "Best" time moment to handoffs.
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