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The recent years have seen an enormous advance in wireless communication technology and a wide spread of various types of wireless networks. It requires effective inter-networking among the heterogeneous wireless networks in order to support user roaming over the networks while maintaining the connectivity. One of main challenges to achieve the connectivity over a heterogeneous wireless network is potential intermittent connections caused by user roaming. The issue is how to maintain the connection as the user roams and how to ensure service quality in the presence of a long disconnection period.
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