Unformatted text preview: into account the available energy of the sensor nodes, QoS requirements of the instruction, memory limitation of nodes, and the localized effect of dense nodes Sinks can give new instructions to the sources without establishing another path SER Benefits of dynamic set-up of routes include: Periodic updates of routes is not needed Adapts to failures and cope with topology changes No routing table is needed at each sensor node New sensor nodes can be added into the route selection The routes are determined based on the QoS requirements of sources Four types of communications are allowed: one-to-one, one-to-many, many-to-one and many-to-many Scout message (S-message) Information message (I-message) Neighbor-neighbor message (N-message) Update message (U-message) Four types of messages are used: SER
SER Overview SER has seven phases: Source Discovery Route Selection Route Establishment Route Reconnection I-message Transmission Instruction Update Task Termination S-message is used during the source discovery to determine sources that will process the instruction (or task) specified in the S-message Sources decide the type and level of the routes needed by the instruction There are four types of routes, each with two levels (i.e., level-1 and level-2) The value is the radius of the level-2 routes SER
SER Overview Stream: Identified by both the type and the level of r...
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- Spring '08
- Sensor node, Packet forwarding, Sink