Ivy Slackers Multihop Routing Barbara Hohlt Nest Retreat January 2003.

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Presentation transcript:

Ivy Slackers Multihop Routing Barbara Hohlt Nest Retreat January 2003

What is Slackers ? Power scheduling multihop routing algorithm for Ivy networks Primary goal is significant reduction of duty cycle per node Network nodes are sparsely positioned Slowly varying periodic data demands

The Algorithm 1.Init – listen 1 cycle for parent 2.For current cycle, pick an advertisement slot and a reservation slot randomly from idle slots 3.Loop through slots in cycle 1. Receive message from downstream 2. Transmit message upstream 3. Broadcast an Advertisement 4. Listen for a reservation request 5. Send reservation request 6. Idle – power down 4.Repeat 2 - 4

Ivy Network Node Application Node Base Station Remote Users Remote Database

Power Scheduling Each time slot is reserved for Transmitting to and Receiving from specific network node pairs __ __ R2 R1 R3 R4 __ T0R5 __ T0 __ T1 __ Rn Rn __ T1 Rn Rn T2 __ Rn Rn Sensor nodes can power down during the time slots that are not scheduled.

0RRTRPR TRTTTRATI 1TIRITIII ATRTPI 2ATRPIII TRIIIIII 3II IAIIITII III 4IIT IIAIIII III 5I IIIAIIIII TII Experiment: Sample schedules from a 6 sensor node network with a demand of 1. The number of slots per cycle is 15. Transmit Receive Advertise Transmit Pending Receive Pending Idle

Connectivity of a 13-node network with. Solid lines represent the standard connection set while the dotted lines are added for the augmented connection set. Each network node has several application nodes (not shown) communicating to each of the network nodes. More realistic networks

A bar chart showing the number of slots occupied by either transmission or reception following completion of the schedule of the 13-node network with a demand of 5 at each node. The number of slots per cycle is 125 and pAS = 0.5 The results are averaged over a set of 100 trials. Duty Cycle

Slackers Architecture AM ReceiveMsgSendMsg Send MultiHopSend MultiHop MultiHopRoute PowerMode PowerScheduler MultiHopRoute receives messages MultiHopSend forwards messages PowerScheduler sends/receives advertisements