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Unformatted text preview: ains level-1 stream which serves as a backbone in setting up level-2 stream The value of is the number of hops away from the nodes in the level-1 stream Messages can flow downhill to the sink or uphill to the sources by flooding through only the nodes that are part of the stream I-message flows downhill from sources to sink by using NH value stored in each node in the C-tree The nodes near to the sources have higher NH values The nodes near to the sources have higher negative NH values U-message flows uphill from sink to sources by using the negative of NH value SER
3. Route Establishment N-message is used by a sensor node to inform neighbors about its local information The source sends an N-message to establish stream back to the sink Sensor nodes that are not part of a stream delete all data associated with Nmessage from C-tree If intermediate nodes between the sources and sinks have not received an Nmessage in response to S-message in a set time interval, the sensor node deletes the C-tree branch that is associated to S-message After the N-message arrives to the sink, the minimum delay or maximum average energy stream is established Sources can start sending I-messages to the sink I-message contains the following fields: TID FI CNH Payload
FI: Flow Indicator (message going uphill or downhill) CNH: Current number of hops Payload: Description SER
4. I-message Transmission The neighbor nodes can determine if they need to route the I-message by the TID since each neighbor...
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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