White Papers

SyncScan: Practical Fast Handoff for 802.11 Infrastructure Networks

• Tags:
• base,
• handoff,
• delay,
• decisions

Overview This paper describes SyncScan, a low-cost technique for continuously tracking nearby base stations by synchronizing short listening periods at the client with periodic transmissions from each base station. The paper implements this SyncScan algorithm using commodity 802.11 hardware and demonstrates that it allows better handoff decisions and over an order of magnitude improvement in handoff delay. Finally, the approach of the paper only requires trivial implementation changes, is incrementally deployable and is completely backward compatible with existing 802.11 standards.

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