Performance evaluation of a fast MAC handoff scheme using dynamic adjustment of scanning parameters

Authors:
Richard W. Pazzi;Zhenxia Zhang;Azzedine Boukerche
Affiliations:
University of Ottawa, Ottawa, ON, Canada;University of Ottawa, Ottawa, ON, Canada;University of Ottawa, Ottawa, ON, Canada
Venue:
Proceedings of the 12th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
Year:
2009

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Abstract

The many advantages of IEEE 802.11 wireless local networks(WLANs) such as low cost, high-speed and easiness of maintenance have enabled the rapid growth and wide deployment of real-time applications. However, due to the limited coverage range of the access points in such networks, frequent handoffs are inevitable for the mobile clients to keep network connections during their movement. High latency and packet loss ratio in the handoff process will cause long delay in the network and degrade the quality of time-critical applications, such as VoIP. To minimize the handoff latency is the key issue of achieving seamless real-time communications. In this paper, a fast handoff scheme with dynamic adaption in MAC layer is presented. Both of the waiting for available channels and the number of scanned channels are reduced to enable fast handoff. The simulation results demonstrate that our scheme meets the requirements of real-time applications.