A fast handover method for 802.11 wireless networks using combined GPS and SNR

Abstract

Abstract:In this paper, we propose a method for increasing the handover performance of the 802.11 link layer. The method reduces the number of scanning channels by referencing an AP map based on GPS. Also, by monitoring the SNRs of the mobile node and neighbor APs, it enables the handover to maintain a higher SNR than a given threshold. The experimental results establish that it has an average disconnection rate of 6.7% and an average SNR of 16.8 dB. It is 8.1% lower rate and 42% higher SNR than the method that makes a handover to the nearest AP without considering SNR. Also, it is 4.1% lower rate and 26% higher SNR than the method used by MadWifi.

Security of Handoff Latency by Prescanning with help of Neighbourgraph

“…[11] is a novel approach towards reducing handover latency in AP dense networks. Besides, much progress has been made in introducing GPS aided handoffs; vide [12] to [13]. To reduce handoff latency in wireless LAN using IAPP [14], an algorithm on context transfer mechanism using "Neighbor Graph" (NG) [15] was suggested in [16].…”

“…[9] is a novel approach towards reducing handover latency in AP dense networks. Besides, much progress has been made in introducing GPS aided handoffs; vide [10], [11], [12], [13], [14]. In our work also we look at another such position dependant solution with a view to minimize overhead signalling problems.…”

Reducing Handover Delay By Pre-Selective Scanning Using GPS

“…Depending upon velocity, direction and on-going traffic of MNs, it can estimate the time when a handover is needed. In [6] an MN generates an AP map to use it for handover in a test aided wireless network.…”