Unformatted text preview: oute Each level-2 stream includes level-1 stream In level-2, the size of the radius of the stream can be determined based on QoS specified in the instruction Combination of types and levels creates different kinds of QoS for a stream After streams are chosen, the source sends N-message to establish the streams back to the sink The repairs of streams are accomplished via N-message and S-message Once the streams are accomplished, data travels from sources to the sink through either level-1 or level-2 stream with I-message The sink can update the instruction (or task) at the sources through either level-1 or level-2 stream using U-message Both sources and sink can terminate the streams using U-message SER
1. Source Discovery A sink broadcasts an S-message to find routes from sink to source S-message contains the following fields: TID NAP LID NH AE
TID: Task ID NAP: Network Access Point (indicates where the instruction is originated; represents a unique sink) LID: Local ID (each node has a local ID that is randomly selected from a set) NH: Number of hops from the sink AE: Average energy of a route AE = NHi-1 * AEi-1 + Ei NHi-1 + 1 SER
1. Source Discovery TID has the following fields: LI MT INS TLOC LI: Length indicator MT: Message type (MT=0 (S-message); MT=1 (I-message); MT=2 (U-message); MT=...
View Full Document
- Spring '08
- Sensor node, Packet forwarding, Sink