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7DS Peer-to-Peer Information Dissemination and Prefetching Architecture

7DS Peer-to-Peer Information Dissemination and Prefetching Architecture. Stelios Sidiroglou-Douskos CS Seminar –Timo Ojala June 10, 2004. What is 7ds?. Message-based application-layer service propagates information objects among mobile nodes that are within high-speed wireless range

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7DS Peer-to-Peer Information Dissemination and Prefetching Architecture

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  1. 7DSPeer-to-Peer Information Dissemination and Prefetching Architecture Stelios Sidiroglou-Douskos CS Seminar –Timo Ojala June 10, 2004

  2. What is 7ds? • Message-based application-layer service • propagates information objects among mobile nodes that are within high-speed wireless range • Carry data using mobile nodes • To and from infrastructure networks • Scales with the user population in a given area • No infrastructure planning or deployment

  3. 7DS approach • Data sharing among mobile hosts in a  peer to peer fashion. • 7DS can coexist with other methods for data access, e.g. via FIS or BS to the Internet. • 7DS as extension of infrastructure and ad-hoc networks

  4. 7ds applications • Wireless web caching • Cheaper, faster links • Emergency Infrastructure • “I’m alive” messages, rescue info • Wireless peer-to-peer sharing • Maps, schedules, email • Wireless mobile sensors • Too far to directly communicate • Vehicle Transportation • Leverage local data

  5. Basic idea • Device wants to get an object • Web page, map, local weather • Obtain from peer within range • Periodically query for object • Device wants to send an object • Email, SMS, I-am-alive • Pass to nearby peer

  6. Architecture • Data access engine • 802.11, Bluetooth • Cache manager • Content cache, reputation, popularity • Search engine • Keyword searching, indexing • Decision maker • Periodic, power-save, forwarding

  7. 7ds Architecture

  8. HTTP Architecture

  9. Communication Protocol

  10. Example

  11. Object Relay • Periodically advertise presence • Relay location-based information (velocity, destination, available buffer size) • Select candidate nodes to relay message • Push object to candidate nodes propagate to other pedestrians encrypt message; encrypt headers with 7DS public key 7DS MTA

  12. Applications for message passing • Email objects • Relaying SMS messages in congested/damaged areas • Message relaying in sensor networks • Traffic management information relaying

  13. Pager as feedback channel FLEX 1600-6400 b/s remove from cache SNPP (RFC 1861) MTA “message 42 delivered” PL-900 POCSAG

  14. Conclussions • 7DS as extension of infrastructure and ad-hoc networks • Combine benefits of low bit-rate, but ubiquitous and high bit-rate, but sparse networks

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