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Improvement of Handoff Latency by GPS based Handoff Technique

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Author(s): Debabrata Sarddar | Shubhajeet Chatterjee | Shaik Sahil Babu | Sumon Kr. Bose | Pingakshya Goswami | Utpal Biswas | Mrinal Kanti Naskar

Journal: International Journal of Computer Applications
ISSN 0975-8887

Volume: 25;
Issue: 4;
Start page: 14;
Date: 2011;
Original page

Keywords: IEEE 802.11b | Handoff Latency | GPS (Global Positioning System) | Direction of velocity of MN | Neighbor APs | Mobile node (MN)

ABSTRACT
Presently IEEE 802.11b based wireless networks are being widely used in various fields like personal as well as business applications. Handoff is a critical issue in IEEE 802.11b based wireless networks. When a mobile node 'MN' moves away from the range of its current access point 'AP' it needs to perform a link layer handoff. This causes data loss and interruption in communication. According to IEEE 802.11b link layer2 'L2' handoff consists of three phases scanning, authentication and reassociation. Scanning process delay is 90% of the total handoff delay. So in this paper we propose a better scanning mechanism to reduce handoff latency. Using GPS we determine the direction of velocity of the MN as well as position. It reduces the time to find the closest and best AP among all neighbor APs. This process effectively reduces the handoff latency.
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