Numerical recipes in C (2nd ed.): the art of scientific computing
Numerical recipes in C (2nd ed.): the art of scientific computing
On the minimum node degree and connectivity of a wireless multihop network
Proceedings of the 3rd ACM international symposium on Mobile ad hoc networking & computing
Proceedings of the 3rd international conference on Mobile and ubiquitous multimedia
Proceedings of the second ACM workshop on Challenged networks
Vertical handoffs in fourth-generation multinetwork environments
IEEE Wireless Communications
Efficient mobility management for vertical handoff between WWAN and WLAN
IEEE Communications Magazine
Channel resource allocation for VoIP applications in collaborative IEEE 802.11/802.16 networks
EURASIP Journal on Wireless Communications and Networking
Research challenges towards the Future Internet
Computer Communications
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We consider an issue arising in a vertical handoff (VHO) between IEEE 802.16e and IEEE 802.11 networks, i.e., how efficiently the scanning operation can be controlled to find a target wireless local area network (WLAN) access point (AP). For this purpose, we propose that the 802.16e Base Stations (BSs) periodically broadcast the information about the density of 802.11 APs within their cell coverage. Based on this information, we develop a mathematical model which predicts the probability that any WLAN AP is found within a given scan time. The analytical model is validated via a comparison with the simulation results obtained for both random waypoint and city section mobility models. Based on the analytical model, we devise an energy-efficient scanning algorithm, which enables an mobile station (MSTA) to decide (1) whether to conduct a scan operation in the current 802.16e cell, and (2) if so, how to configure the inter-scan interval considering the energy consumption due to the scan operation. An intensive simulation study shows that our proposed scanning algorithm indeed works well as designed.