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Delay-Tolerant Mobile Ad-hoc Networks

Delay-Tolerant Mobile Ad-hoc Networks. Network Research Lab UCLA. DTN Background. #1: satellite. #2: dialup. Receive data from Ann. Send data to Brandy. #3: memory stick on motorcycle. DTN Background. DTN: new network architecture for scenarios with intermittent connectivity

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Delay-Tolerant Mobile Ad-hoc Networks

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  1. Delay-Tolerant Mobile Ad-hoc Networks Network Research Lab UCLA

  2. DTN Background #1: satellite #2: dialup Receive data from Ann Send data to Brandy #3: memory stick on motorcycle UCLA/CSD

  3. DTN Background • DTN: new network architecture for scenarios with intermittent connectivity • Interplanetary communications, • Communications between remote villages (example on previous slide), • Communications with mobile users, etc. • Common DTN characteristics: • Data is aggregated into bundles at intermediate node where connection breaks up. • Bundles await the re-establishment of connectivity • Bundles are sent in steps from one disconnect point to the next until they reach destination (rather than using a single end-to-end file transfer). UCLA/CSD

  4. Ad-hoc Storage Overlay System (ASOS) • In MANETs (Mobile AdHoc Networks), connectivity is often disrupted due to mobility, interference, failures, etc. • ASOS: Ad-hoc Storage Overlay System • Proposed DTN approach for MANETs • Peer-to-peer model • Data are transmitted end-to-end directly, if a path exists. • Otherwise, data are stored in the overlay in a redundant and distributed fashion. UCLA/CSD

  5. ASOS storage node Regular node ASOS Example 4: ASOS data delivery D 2: Network partitioning ASOS overlay 3: Undeliverable data replicated to reachable ASOS peers 1: Conventional end-to-end connection S UCLA/CSD

  6. Performance Evaluation: Vehicle Scenario • ASOS implemented in QualNet • Virtual Track (VT) mobility model • Battlefield scenario: • 7 “switch stations” • 4 tank platoons, with 5 tanks each • 5 HUMVEEs • 5 relay stations • Traffic: • CBR, 5 sources to one destination (command post), all moving UCLA/CSD

  7. Instantaneous Throughput • Conventional scheme: • instantaneous throughput always below input rate. • ASOS: • Instantaneous throughput may go above input. • Reason: stored data is transmitted later when connectivity improves. UCLA/CSD

  8. Delivery Ratio • Overall, at the end of the data transfer, ASOS manages to deliver twice as much data as the conventional scheme UCLA/CSD

  9. dst src Work in progress: DTN Backbone • MB nodes used for storage • Thin BB links vs high speed ground links UCLA/CSD

  10. Delay Tolerant Mobile Backbone UCLA/CSD

  11. Delay Tolerant Mobile Backbone UCLA/CSD

  12. Delay Tolerant Mobile Backbone UCLA/CSD

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