An empirical analysis of the IEEE 802.11 MAC layer handoff process
ACM SIGCOMM Computer Communication Review
Improving the latency of 802.11 hand-offs using neighbor graphs
Proceedings of the 2nd international conference on Mobile systems, applications, and services
Practical Schemes for Smooth MAC Layer Handoff in 802.11Wireless Networks
WOWMOM '06 Proceedings of the 2006 International Symposium on on World of Wireless, Mobile and Multimedia Networks
IMC '05 Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement
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Fast and multimedia ready handoffs are the prime requirement as IEEE 802.11 wireless networks are increasingly being deployed for providing voice and other real time services at public places like airports, hotels and university campuses. We have proposed and implemented a multimedia ready handoff technique aimed at reducing handoff latency to less than 10ms. Handoff latency has been reduced by decoupling scanning from handoff execution process. Mobile nodes continuously gather the neighbour information using optimized Background Scanning. This scheme has been implemented in the form of client side application with modifications to open source Madwifi driver. Performance of this handoff scheme has been evaluated on experimental Testbed for finding its suitability for real time applications. Effect of the proposed scheme on commercial VoIP client, Skype has been evaluated. Effect of the proposed handoff and optimized Background Scan on audio and video streaming has also been investigated. Results show that the proposed handoff and optimized background scanning cast minimal effect on real time VoIP and audio/video streaming traffic and are multimedia ready.