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DTNs Delay Tolerant Networks

DTNs Delay Tolerant Networks. Papers. Fall, Kevin. Intel Research, Berkeley. SIGCOMM 2003 Aug25, 2003. A Delay-Tolerant Network Architecture for Challenged Internets . August 2003. Warthman , Forrest. Delay Tolerant Networks (DTNs): A Tutorial . March 2003.

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DTNs Delay Tolerant Networks

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  1. DTNsDelay Tolerant Networks

  2. Papers • Fall, Kevin. Intel Research, Berkeley. SIGCOMM 2003 Aug25, 2003. A Delay-Tolerant Network Architecture for Challenged Internets. August 2003. • Warthman, Forrest. Delay Tolerant Networks (DTNs): A Tutorial. March 2003. • Jones, Evan P.C. Practical Routing in Delay-Tolerant Networks.

  3. Introduction • TCP/IP service model works great with connected, reliable networks. • Several implicit assumptions: • E2E Path exists (Connected) • RTT small • Drop probability is small • Symmetric Data Rates

  4. The TCP/IP Model

  5. The TCP/IP Model

  6. Challenged Networks • Terrestrial Mobile Networks • Exotic Media Networks • Military Ad Hoc Networks • Sensor Networks

  7. Terrestrial Mobile Network Example

  8. Challenged Networks Path and Link Characteristics • High Latency • Low Data Rate • Disconnection • Long Queuing Times

  9. Challenged Networks End System Characteristics • Limited Longevity • Low Duty Cycle Operation • Limited Resources

  10. Ideas Fix TCP/IP? Link Repair Approach Performance Enhancing Proxy (PEP) Protocol Boosters Proxies Electronic Mail US Postal Service Message Based Overlay Architecture Bundling

  11. Store and Forward Nodes use persistent storage to store messages indefinitely Forward when able to do so, Otherwise, wait

  12. DTN

  13. DTN Regions A DTN is a network of networks These “sub” networks are called Regions Each Region has a unique Region ID that is globally known throughout the DTN DTN Resources are identified by name tuples (Region ID, Entity ID) DTN Gateways are members of two or more regions and handles all communication between regions

  14. Overlay: The Bundle Layer

  15. Overlay: The Bundle Layer

  16. DTN Nodes

  17. Custody Transfers Hosts store bundles in persistent storage until custody can be passed or TTL expires Hosts request custody transfer to next-hop node Next-hop node has option to accept custody Local copy removed upon transfer of custody Only nodes supporting CT can accept custody Transport Layer protocol terminatesupon acceptance of custody

  18. Custody Transfers

  19. Overlay: The Bundle Layer

  20. DTN Gateway

  21. DTN vs. TCP/IP

  22. Names and Addresses

  23. Security

  24. IPN (InterPlanetaryNetwork) Example

  25. IPN (InterPlanetaryNetwork) Example Step 1: Bundle Creation at Source

  26. IPN (InterPlanetaryNetwork) Example Step 2: Transmission by Source

  27. IPN (InterPlanetaryNetwork) Example Step 3: First Hop Bundle Processing/Forwarding

  28. IPN (InterPlanetaryNetwork) Example Step 4: Second Hop Bundle Processing/Forwarding

  29. IPN (InterPlanetaryNetwork) Example Step 5: Bundle Reception at Destination

  30. THE END Questions?

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