Fast Handoff Implementation by using Geometrical Mathematical Models and Carrier to Interference Ratio based Handoff Algorithm
International Journal of Computer Applications
IEEE 802.11b networks are becoming more ubiquitous. While roaming through access points, a M obile Station is often required to perform a link layer handover. This mechanism causes connection losses and breaks in time-sensitive communication, especially if a network layer handover follows the link layer handover. In this paper, we propose to reduce handoff latency for IEEE 802.11 wireless networks with Neighbor Graphs (NG) pre-scanning mechanisms and using a GPS based server which predetermines
... which predetermines the next probable AP using three formulated geometry based mathematical techniques. IEEE 802.11 uses 11 channels of which the channels 1, 6 and 11 do not mutually overlap. As they are non-overlapping, the channels are expected to have a lower carrier-to-interference ratio (CI) compared to the other channels present under the same base station, which increases the channel"s availability during handoff. When handoff criterion have been met, we design an algorithm to first determine the Access Point (AP) under whose coverage area the M obile Station (M S) would enter, then scanning the channels 1, 6 and 11, if present under the next Access Point (AP), to reduce the scanning delay. We also introduce pre-authentication mechanism, which will effectively reduce the message processing delay.