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Block-switched Networks: A New Paradigm for Wireless Transport

Block-switched Networks: A New Paradigm for Wireless Transport. Offense Alok Rakkhit and Patrick Wong. Hop and the Link Layer. Designed for wireless link-layer protocols specifically How will it work over other LL protocols? Replace Hop with TCP/UDP under wired protocols?

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Block-switched Networks: A New Paradigm for Wireless Transport

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  1. Block-switched Networks: A New Paradigm for Wireless Transport Offense Alok Rakkhit and Patrick Wong

  2. Hop and the Link Layer • Designed for wireless link-layer protocols specifically • How will it work over other LL protocols? • Replace Hop with TCP/UDP under wired protocols? • If LL bursts behave differently, will there still be performance gains?

  3. Hop and the Network Stack • Breaks hierarchy by skipping over network layer and directly interacting with link layer • How will issues at IP layer affect Hop • Never explicitly stated • At every hop a packet packets have to be processed down to the transport layer instead of the link layer • Implemented over UDP, making it a second Transport Layer? • Are the comparisons representative?

  4. Caching • Makes heavy use of caching at each router • When there is lots of traffic won’t there be issues with the caches filling up?

  5. Performance gains • Not clear whether the performance is due to Hop itself or the underlying routing protocol • “In conjunction with a disruption-tolerant routing protocol…” it does well

  6. Experiment • Why 802.11b? Why not conduct all the experiments on 802.11g instead of shoving that as a sub-experiment? • Table 1: Median and mean improvements are so different. Some of the means are just 1x = no improvement! • Multiple researches on TCP modifications for multi-hop networks. • Would have been nice to compare those instead • Makes a stronger argument that Hop is *fundamentally* better

  7. Conclusion • Not easily deployable • Paper does not conclusively prove Hop is fundamentally better than TCP

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