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Fast Handoff Implementation by using Geometrical Mathematical Models and Carrier to Interference Ratio based Handoff Algorithm

Author(s): Debabrata Sarddar | Shubhajeet Chatterjee | Arnab Raha | Sreya Mallik | Utpal Biswas | Mrinal Kanti Naskar | Pulak Mazumder

Journal: International Journal of Computer Applications
ISSN 0975-8887

Volume: 27;
Issue: 6;
Start page: 1;
Date: 2011;
Original page

Keywords: Handoff | Neighbor Graph | Access point (AP) Selective channel scanning mechanism | Carrier- to-Interference (CI) Ratio | Global Position Systems (GPS)

IEEE 802.11b networks are becoming more ubiquitous. While roaming through access points, a Mobile Station is often required to perform a link layer handover. This mechanism causes connection losses and breaks in timesensitive 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' prescanning mechanisms and using a GPS based server 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 nonoverlapping, the channels are expected to have a lower carriertointerference ratio 'CI' compared to the other channels present under the same base station, which increases the channels 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 Mobile Station 'MS' 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 preauthentication mechanism, which will effectively reduce the message processing delay.
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