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Unformatted text preview: nodes maintain a C-tree When a source broadcasts I-message, it sends CNH field with the value from T-tree Intermediate nodes between sources and sink use C-tree FI and CNH fields are only used when the stream is level-2 Each node only rebroadcasts once to avoid a node from broadcasting the same message over again After an I-message is received, the sensor nodes turns OFF the receiver for some amount of time if the sleep mode operation is ON such that the node can avoid listening neighbors broadcasting the same I-message C-tree indicates which instructions the sensor nodes need to route SER
5. Route Reconnection If a sensor node is low on energy or there is too much noise around when transmitting at level-1, it can broadcast an N-message by setting up reconnect message indicator Once the neighbors receive N-message, they check their C-tree to decide if there are possible alternate routes N-message will be broadcasted until the alternate route is found Sudden Death of Route If the stream suddenly terminates, sink cannot get the I-messages The sink sends out a new S-message with higher QoS requirement version of the same instruction (higher QoS INS value) New streams can be found to avoid broken paths Multiple streams of level-2 can be setup between source and sink to improve robustness of I-message routing SER
6. Instruction Update U-message allows sink to update its instruction to the sources The U-message from the sink to the sources flow uphill while it flows downhill fr...
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This note was uploaded on 08/25/2011 for the course EEL 5937 taught by Professor Staff during the Spring '08 term at University of Central Florida.
- Spring '08