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sChat: A Group Communication Service Over Wireless Sensor Networks

Neighbors. Neighbors. sChat: A Group Communication Service Over Wireless Sensor Networks Fei Sun, Chien-Liang Fok, Gruia-Catalin Roman Washington University in St. Louis. Mobile Computing Laboratory. Approach. Motivation.

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sChat: A Group Communication Service Over Wireless Sensor Networks

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  1. Neighbors Neighbors sChat: A Group Communication Service Over Wireless Sensor Networks Fei Sun, Chien-Liang Fok, Gruia-Catalin RomanWashington University in St. Louis Mobile Computing Laboratory Approach Motivation • Implement the group communication service on top of Agilla, a mobile agent middleware for sensornets • Each user has a member agent in the network that “follows” the user and handles communication between the user and the group • Wireless sensornets are more robust and less likely to fail in disaster scenarios • They can serve as an alternative medium through which rescuers can communicate • When a user moves, it “drags” its member to its new location. Member updates its new location with leader when it is dragged. User injects a new member if it fails to drag its old member. Problem Statement • The sensornet is initially deployed for some other purpose (e.g., environmental monitoring) • Users (rescuers) must remain in contact with each other while continuously moving. • Limited resources • Membership? • Unreliable wireless links • The leader agent keeps track of member locations and distributes group broadcast messages • The registry keeps track of leader location Supported Operations Agilla Middleware • Join - Member agents can join a specific group to exchange messages within the group. A group is formed when the first member joins. • Leave - A member agent can leave a specific group to stop sending or receiving messages within the group. A group is disbanded when the last member leaves. • Send - Member agents can send messages that will be forwarded to all the other members in the same group. • Mobile agents • move and clone across nodes • can be dynamically injected • Simplifies development • high-level agent abstraction • context discovery • multi-hop geographic greedy routing Leader Tuplespace Node (2,1) Node (1,1) Agents Agents migrate • <“mbr”, enumerator, agent id, location> • Enumerator: iterative access for broadcast • Agent id: random access for member location updates remote access Tuplespace Tuplespace Agilla Middleware Agilla Middleware TinyOS TinyOS MICA2 Mote MICA2 Mote This research was supported by the NSF under NOSS grant CNS-0520220.

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