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Presented on: October 8, 2012

Trickle: A Self-Regulating Algorithm for Code Propagation and Maintenance in Wireless Sensor Networks. Presented on: October 8, 2012. Problem. Wireless Sensor Networks

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Presented on: October 8, 2012

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  1. Trickle: A Self-Regulating Algorithm for Code Propagation and Maintenance in Wireless Sensor Networks Presented on: October 8, 2012

  2. Problem Wireless Sensor Networks Consist of large no. of small, resource-constrained computing nodes, Operate unattended for long durations, scale and embedded nature REQUIRE CODE to be PROPAGATED over the Network.

  3. Problem (continued) • Codes need to be propagated QUICKLY and EFFICIENTLY • Maintenance of a consistent code image throughout the Network + Low power radios (high loss, transient disconnection)

  4. Algorithm Requirements • Algorithm needs to have three properties • Low Maintenance • Rapid Propagation • Scalability • Maintain its other properties in wide ranges of network density

  5. Experimental Methodology Three Different Platforms: 1. Abstract Simulation High level abstract algorithm simulator: Trickle-specific, quickly evaluates change in algo behavior 2. TOSSIM A bit-level simulator for TinyOS, a sensor network operating system 3.Tiny OS nodes Used for empirical studies

  6. Trickle To exchange code metadata -“Polite Gossip” policy • If a node hears gossip with same metadata, it keeps quiet. • If it hears an old gossip, it broadcasts a code update. • Nodes adjust the length of their gossiping attention spans, communicating more often when there is new code.

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