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Aruna Balasubramanian, Ratul Mahajan Arun Venkataramani, Brian N Levine, John Zahorjan

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Aruna Balasubramanian, Ratul Mahajan Arun Venkataramani, Brian N Levine, John Zahorjan

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Presentation Transcript

    2. Motivation Increasing demand for network access from vehicles E.g., VoIP, Web, email Cellular access expensive Ubiquity of WiFi Cheaper, higher peak throughput compared to cellular 2

    3. Our work 3

    4. Talk outline 4

    5. VanLAN: Our Vehicular Testbed 5

    6. Measurement study 6

    7. Handoff policies studied Practical hard handoff Associate with one BS Current 802.11 Ideal hard handoff Use future knowledge Impractical 7

    8. Handoff policies studied Practical hard handoff Associate with one BS Current 802.11 Ideal hard handoff Use future knowledge Impractical Ideal soft handoff Use all BSes in range Performance upper bound 8

    9. Comparison of handoff policies 9

    10. Talk outline 10

    11. Designing a practical soft handoff policy 11

    12. Why are existing solutions inadequate? 12

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    19. Talk outline 19

    20. Evaluation 20 Mention the voip and tcp were deployedMention the voip and tcp were deployed

    21. ViFi reduces disruptions in our deployment 21

    22. ViFi improves VoIP performance 22

    23. ViFi improves performance of short TCP transfers 23

    24. ViFi uses medium efficiently 24

    25. Conclusions Our work improves performance of interactive applications for vehicular WiFi networks Interactive applications perform poorly in vehicular settings due to frequent disruptions ViFi, a diversity-based handoff protocol significantly reduces disruptions Experiments on VanLAN shows that ViFi significantly improves performance of VoIP and short TCP transfers 25

    26. Practical soft handoff 26

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