Real-World Energy Measurements of a Wireless Mesh Network

Energy Efficiency in Large Scale Distributed Systems

A. Jamakovic, D. Dimitrova, M. Anwander, T. Macicas, T. Braun, J. Schwanbek, Th. Staub, B. NyffeneggerUniversität Bern, Switzerlandbraun@iam.unibe.ch, cds.unibe.ch

Torsten Braun: Real-World Energy Measurements of a Wireless Mesh Network

Overview

> Introduction — Environmental Monitoring Area— Wireless Mesh Network Topology at Rhone Valley— Environmental Monitoring Scenarios

> Solar-Powered Wireless Mesh Nodes— Solar-Powered Wireless Mesh Node Hardware and Software— Solar Energy Harvesting

> Energy Harvesting and Consumption Measurement Scenario> Measurement Results

— Daily/Weekly Battery and Solar Panel Voltage Measurements— Relationship of Battery and Solar Panel Voltage— Battery Load and Mesh Node Consumption— Solar Panel / Mesh Node Voltage and Battery / Mesh Node Current

> Conclusions and OutlookEE-LSDS, Vienna, April 24, 2013

Environmental Monitoring Area

Sierre

Tseuzierstorage lake

Plaine Morte glacier

EE-LSDS, Vienna, April 24, 2013

Wireless Mesh Network Topology at Rhone Valley

Plaine Morte Glacier

Sierre

Environmental Monitoring Scenarios

Solar-Powered Wireless Mesh Nodes

Wireless Mesh Node Hardware and Software

> IP66 steel enclosure> 1-2x Alix 3D2 system boards> 1x Alix 6F2 system board> 1-4x 801.11n mini PCI cards> 1x 801.11g mini PCI card> 1x UMTS mini PCI-Express

card> I2C twin relay> 2x2 MIMO, 25dBi,

dual polarization panel antennas for 5.8 Ghz

> ADAM Linux running Optimized Link State Routing

Solar Energy Harvesting

> 90 Watt solar panels, voltage: 18.75 V> Panels supply lead acid battery (78 Ah) and wireless mesh node

Energy Harvesting and Consumption Measurement Scenario

> Energy measurements by charge controller— in winter (nodes 3, 7) — In summer (nodes 7, 8)

Voltage Measurements During a Summer Day

Voltage Measurements During a Winter Day

Voltage Measurements During a Summer Week

Relationship of Battery and Solar Panel Voltage During Summer

Relationship of Battery and Solar Panel Voltage During Winter

Battery Load and Mesh Node Consumption During Summer

Battery Load and Mesh Node Consumption During Winter

Solar Panel / Mesh Node Voltage andBattery / Mesh Node Current

Conclusions and Outlook

> Energy harvesting and consumption data in a real wireless mesh deployment

> Results show good combination of battery and solar panel.> Energy supply has been sufficient in our challenging

deployment. > Certain nodes need more energy, data are valuable for solar

panel dimensioning> Possible control of mesh node based on available energy and

weather prediction ?

Thanks for your Attention

> More information — cds.unibe.ch and a4-mesh.unibe.ch — slideshare.net/torstenbraun— braun@iam.unibe.ch

Real-World Energy Measurements of a Wireless Mesh Network

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