Flexible Power Scheduling for Sensor Networks Barbara Hohlt Eric Brewer Nest Retreat June 2003.

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Presentation transcript:

Flexible Power Scheduling for Sensor Networks Barbara Hohlt Eric Brewer Nest Retreat June 2003

What is flexible power scheduling ? A distributed on-demand power-management protocol for collecting data in sensor networks. Power Scheduling aims to significantly reduce energy consumption while supporting fluctuating demand in the network and provide local routing information and synchronicity without global control. Energy savings are achieved by powering down routing nodes during idle times identified through dynamic scheduling.

A node can be in one of six states Transmit (T) – Transmit a message upstream (toward the base station) Receive (R)- Receive a message from downstream Advertisement (A)- Broadcast an Advertisement for an available reservation slot Transmit Pending (TP) – Send a reservation request Receive Pending (RP) – Receive a reservation request Idle (I) – Listen for advertisements or power down

0RRTRPR TRTTTRATI 1TIRITIII ATRII 2AT III TRIIIIII 3II IAIIITII III 4IIT IIAIIII III 5I IIIAIIIII TII Actual schedules from a 6 node network. Transmit Receive Advertise Receive Pending Idle

“Slackers” Prototype AM ReceiveMsgSendMsg Send MultiHopSend MultiHop MultiHopRoute PowerMode PowerScheduler MultiHopRoute receives messages MultiHopSend forwards messages PowerScheduler sends/receives advertisements

16660 Experimental Setup Power Consumption Network Adaptation Topology: A 3-hop network. Node 0 is the base station, Node 66 and Node 1 are intermediate nodes, and Node 6 is the sender.

The measured current at Node 1 over 10 seconds while it is forwarding packets. Node 6 sends a 36 byte data packet once per cycle, every 2.6 seconds. There are 40 time slots per cycle and each time slot is 65 ms. Power Consumption

Network Response Time Histogram showing the distribution of 100 response times in the network. Times represent the time when Node 66 reacts to a request for demand from the sending Node 6. 2 cycles = 6.4 s

Network Adaptation Node 1 and Node 66 adapt to fluctuating demand in the network as Node 6 increases and decreases its demand by 2. There are 40 slots per cycle and each time slot is 80 ms. The network recovers from anomalies due to the randomness of positive reservation requests.

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