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Fast Handoff Implementation by Neighbor Graph with Help of Global Positioning System

Debabrata Sarddar, Shubhajeet Chatterjee, Pulak Mazumder, Sougata Chakraborty, Jayanta Kumar Bagchi, Kunal Hui, Kalyan Kumar Das, Milton Samadder

Abstract


IEEE 802.11b networks find unlimited applications. While roaming through an access points, a mobile node (MS) is frequently required to carry out a link layer handover. This mechanism causes a user intercept able connection loss and breaks in time-sensitive communication, especially when a network layer handover follows the link layer handover. In this paper, we propose a method to reduce handoff latency for IEEE 802.11b wireless networks with the help of Neighbor Graphs (NG), pre-scanning mechanisms and using a GPS based server which predetermines the next probable AP a mathematical techniques. IEEE 802.11 consist of11 channels among which the channels 1, 6 and 11 do not mutually overlap. The non overlapping channels are expected to have a lower carrier-to-interference (CI) ratio as compared to the other channels in attendance to the same base station, which increases the channel‟s accessibility during handoff. Based on the NG pre-scanning mechanism and next AP prediction using the GPS, when handoff criterions have been met, we design an algorithm to first scan 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.

Keywords


Handoff, Neighbor Graph, Selective Channel Scanning Mechanism, Carrier-to-Interference (CI) Ratio, Global Position Systems (GPS).

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