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Minimization of Call Blocking Probability using Auxiliary Stations

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

Journal: International Journal of Computer Applications
ISSN 0975-8887

Volume: 25;
Issue: 7;
Start page: 50;
Date: 2011;
Original page

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

Now a day, 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. Quality of service 'QoS' demanding applications like Voice over IP 'VoIP' and multimedia require seamless handover. But handoff failure provides a serious barrier for such services to be made available to mobile platforms. Throughout the last few years many researches had been done to reduce the handoff failure probability. Here we propose a method to minimize the handoff failure probability by effectively placing auxiliary cells in the main cell. During handoff, a mobile station 'MS' on entering a new cell, requests a channel from the base station 'BS' to continue an existing call. However, if no such channels are available then this would lead to handoff failure and subsequent dropping of an existing call. This failure probability may be minimized if the handoff request is served by an Auxiliary Station 'AS' closest to the mobile station 'MS', if the channels of base station 'BS' are not free. The mobile station, being in the auxiliary station, will send requests to the base station within fixed time intervals and when it will find free channels are available in base station it will automatically connect with it, rejecting the connection of the auxiliary station 'AS'. This process effectively reduces the handoff failure probability.
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