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Peer-to-peer and WiFi

Peer-to-peer and WiFi. Jon Crowcroft The Computer Laboratory University of Cambridge jon.crowcroft@cl.cam.ac.uk. People and Projects in Cambridge . Faculty: Jon Crowcroft, Ian Pratt Research Staff: Sven Ostring, + PhDs: Rajiv Chakravorty & Meng How Lim Projects: COM(vodafone) CMI

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Peer-to-peer and WiFi

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  1. Peer-to-peer and WiFi Jon Crowcroft The Computer Laboratory University of Cambridge jon.crowcroft@cl.cam.ac.uk

  2. People and Projects in Cambridge • Faculty: • Jon Crowcroft, Ian Pratt • Research Staff: • Sven Ostring, + • PhDs: • Rajiv Chakravorty & Meng How Lim • Projects: • COM(vodafone) • CMI • MobileMAN

  3. Mobileman Kickoff MeetingPisa, 5/11/02 • P2P & WiFi • Spectrum Economics

  4. Analysis of Self Organisation • It has been noted that peer-to-peer and ad hoc wireless networks both use techniques of self organisation • We would like to examine this similarity properly • Analyse which particular techniques are useful (e.g. routing, load management, etc) • See if we can create a next generation ad hoc wireless net – one step beyond the 2 level system in terminode networks (perimiter + spine) • Infocom + followup proxinet paper…soar?

  5. Location Services Experiment • P2p makes use of techniques such as consistent hashing, rabin fingerprints, bloom filters and so on, for mapping key to location • Perhaps a similar model could be used for addressing • Would note that these often lead to very poor latency • Techniques such as landmarks, shortcuts, lighthouse, chord etc are worth looking at • Paper submitted to IPTPS on “lighthouses”

  6. Notification Services • Could look at Scribe (P2P based Event service based on Pastry) • Could look at event services as driving model – could be information or applications like games…. • Problem of effort levels! • Have to enlist PhDs at cambridge!!!…

  7. Performance Enhancing Overlays • P2p and overlays are dual. • We would like to look at the interaction between overlays and underlying mobile/wireless dynamics • We have looked at a system of TCP proxies to mitigate performance problems in wireless access nets (have Infocom 03 paper on this) – we could extend this to ad hoc multi-hop/multi-path systems too • Other overlays (e.g. application specific routing and trans-coders etc are of interest too.

  8. Cambridge Mobileman P2P Research Topics • Analysis • Experimental Application Platform • Tests for Performance

  9. Relevant p2p technologies • Pastry/Scribe/Xenostore – • Storage, notification, searching • Consistent Hash + location • Eternity, Freenet • Privacy, persistence,caching • Robustness • Rabin fingerprint, bloom filter • ALAN/Overqos/RON • App level routing

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