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The authors 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, they 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, they 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.
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