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Minimization of Handoff Latency by Directional Tangent Method using GPS based Map

Author(s): Debabrata Sarddar | Shubhajeet Chatterjee | Pulak Mazumder | Rashmi Ranjan Sahoo | Madhurendra Kumar | Utpal Biswas | Mrinal Kanti Naskar

Journal: International Journal of Computer Applications
ISSN 0975-8887

Volume: 25;
Issue: 6;
Start page: 1;
Date: 2011;
Original page

Keywords: IEEE 802.11 | Handoff latency | GPS (Global Positioning System) | Base Station (BS) | Mobile Station (MS) | Neighbor Aps

In this paper, we describe the formatting guidelines for IJCA Journal Submission. Presently, IEEE 802.11 based wireless local area networks 'WLAN' have been widely deployed for business and personal applications. The main issue regarding wireless network technology is handoff or hand over management. When a mobile station 'MS' moves outside the range of its current access point 'AP' it needs to perform a link layer handover. This causes data loss and interruption in communication. According to IEEE 802.11, link layer2 'L2' handoff is performed in three phases scanning, authentication and reassociation. Scanning process causes 90% of the total handoff delay. Throughout the last few years, plenty of researches had been done to reduce the hand off delay by reducing the scanning delay. Here we propose a new scanning technique in which we divide a cell in three sectors and thus reducing the number of APs to be scanned by fixing the neighbour APs with respect to each sector. Thus, we have two fixed APs for each sector. MS will choose the nearest one between them by means of distance measurement method. This process effectively reduces the handoff latency.

Tango Jona
Tangokurs Rapperswil-Jona

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