Energy Conservation in Wireless Sensor Networks

Under supervision: Dr. Ahmed Akl

Presented by: Ahmed Reda Elshami

Course Code: CC735

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Overview

• Introduction• Challenge• Architecture of a typical WSN• Power breakdown• Basic Approaches• Taxonomy approaches• Future Work• Questions• Reference

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Introduction

• A wireless sensor network consists of sensor nodes deployed over a geographical area for monitoring physical phenomena like temperature, humidity, vibrations and so on.

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Challenge

• Power, Power, Power, …

• Life time with two AA batteries ≈ 20 days

• Processing capacity evolution VS. Battery capacity evolution

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Architecture of a typical wireless sensor node

• sensor node is a tiny device that includes fourmain components

MCU = Microcontroller Unit ADC = Analog Digital Converter

DC-DC = Direct current to Direct current converter

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Power breakdown

• The communication subsystem > computation subsystem

• The radio energy consumption is of the same order in the reception = transmission = and idle states, while the power consumption drops of at least one order of magnitude in the sleep state.

• Depending on the specific application, the sensing subsystem might be another significant source of energy consumption

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Basic Approaches to Energy Conservation in WSNs

Basic Approaches to Energy

Conservation in WSNs

Duty cyclingData-driven

approachMobility approach

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Duty Cycling

Duty Cycling

Topology Control

Power Management

Sleep/Wakeup protocol

MAC protocol with low Duty Cycle

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Data-drivenData-driven

Energy-efficent Data Acquisition

Data reduction

In-network Processing

Data Compression

Data Prediction

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Mobility-based

Mobility-based

Mobile-sink

Mobile-relay

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Taxonomy approaches to energy savings in sensor networks

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Future Work

• The integration of the different approaches into a single off-the-shelf workable solution

• Many real applications have shown the power consumption of the sensor is comparable to, or even greater than, the power needed by the radio.

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Questions?

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Reference

• Giuseppe Anastasi, Marco Conti, Mario Di Francesco, Andrea Passarella, (2008), Energy Conservation in Wireless Sensor Networks: a Survey. Elsevier B.V

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Thank you

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