B.P. Kafle, E. Kamioka, and S. Yamada (Japan)
Heterogeneous wireless networks, wireless overlay networks, user satisfaction function, network selection.
Future wireless/mobile system is expected to have hetero geneous wireless overlay networks for ubiquitous multime dia communication. Two or more wireless accesses with varied bandwidth and coverage range will be available from some geographical area. In general, an access network with higher bandwidth has smaller coverage. In an overlay network environment, most of the mobile users will try to connect to higher bandwidth network, as large bandwidth consuming multimedia applications have been increasing. However, depending on its location and mobility pattern, a user may move out of the higher bandwidth network at any time during the communication. In this paper, we in vestigate the effect of changing access network during a communication session on overall performance of network service perceived by users. For this purpose, we define user satisfaction function as a measure of network service per formance from user's perspective, and evaluate the effect of user's mobility on user satisfaction function. Based on the evaluation we propose a scheme for selecting an access network in heterogeneous networks environment that opti mizes the overall user satisfaction.
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