Delay-Tolerant Mobile Ad-hoc Networks

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Presentation transcript:

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

DTN Background #1: satellite #2: dialup #3: memory stick on motorcycle Receive data from Ann Send data to Brandy #3: memory stick on motorcycle April 6, 2019 UCLA/CSD

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). April 6, 2019 UCLA/CSD

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. April 6, 2019 UCLA/CSD

ASOS Example D S 4: ASOS data delivery 2: Network partitioning ASOS overlay 3: Undeliverable data replicated to reachable ASOS peers 1: Conventional end-to-end connection S ASOS storage node Regular node April 6, 2019 UCLA/CSD

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 April 6, 2019 UCLA/CSD

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. April 6, 2019 UCLA/CSD

Delivery Ratio Overall, at the end of the data transfer, ASOS manages to deliver twice as much data as the conventional scheme April 6, 2019 UCLA/CSD

Work in progress: DTN Backbone MB nodes used for storage Thin BB links vs high speed ground links dst src April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

Delay Tolerant Mobile Backbone April 6, 2019 UCLA/CSD

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