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

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Title: The Internet Real-Time Laboratory Author: Administrator Last modified by: Stelios Sidiroglou-Douskos Created Date: 6/9/2004 7:15:54 PM Document presentation format – PowerPoint PPT presentation

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


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
  • Im 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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