Part I: Introduction to Wireless Sensor Networks. Xenofon Fafoutis
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1 Part I: Introduction to Wireless Sensor Networks Xenofon Fafoutis
2 Sensors 2 DTU Informatics, Technical University of Denmark
3 Wireless Sensor Networks Sink Sensor Sensed Area 3 DTU Informatics, Technical University of Denmark
4 Outline Wireless Sensor Networks Types and Topologies Applications System Issues and Standards Energy Harvesting 4 DTU Informatics, Technical University of Denmark
5 Types of Nodes Sensor Low resources Inexpensive Energy constraints Main challenge!! Sink High resources AC power supply Internet connection (typically) Typically traffic is generated by the sensors and it is directed to the sink 5 DTU Informatics, Technical University of Denmark
6 Unstructured vs. Structured Unstructured Dense Ad hoc Structured Fewer sensors Strategic positions Forest 6 DTU Informatics, Technical University of Denmark Railway
7 Topologies Multi-sink Increased cost Increased performance Reliability Mobile sinks Move and gather data 7 DTU Informatics, Technical University of Denmark
8 Topologies: Single- vs. Multi-Hop Single-Hop Short coverage Less challenging Higher deployment costs per m 2 Multi-Hop Large Coverage Challenging 8 DTU Informatics, Technical University of Denmark
9 Topologies: Wireless Mesh Network Very large sensed areas Wireless links of several hundreds of meters Sink w/o Internet Connection Central Station w/ Internet Connection 9 DTU Informatics, Technical University of Denmark
10 Outline Wireless Sensor Networks Types and Topologies Applications System Issues and Standards Energy Harvesting 10 DTU Informatics, Technical University of Denmark
11 Application Types Monitoring Environmental, industrial and health monitoring Factory and process automation Logistics storage support Tracking Tracking objects, animals, people and vehicles Military, business, public transportation networks 11 DTU Informatics, Technical University of Denmark
12 Traffic Classification Continuous Mainly on monitoring applications Predictable and static Event-Driven Mainly on tracking applications Threshold alerts Unpredictable triggering Request-Reply Predictable triggering Hybrid 12 DTU Informatics, Technical University of Denmark
13 Application Requirements End-to-end delay Tracking, alerting applications Reliability Long-term monitoring for off-line analysis Main trade-off / challenge of WSNs Application requirements vs. Energy constraints 13 DTU Informatics, Technical University of Denmark
14 Typical applications Environmental monitoring Indoor environment control: light, temperature, status of windows and doors, indoor air pollution Great Duck Island: Sense the environment that birds live (temperature, pressure, humidity) Military applications A line in the Sand: Sensors that can detect metallic objects, tracking and classifying moving objects Support for logistics Storage management of barrels by BP: Detect incompatibilities in storage that may lead to explosions Human-centric applications Support for senior citizens: Identify behaviors, indicate early stages of disorders, recording if they are taking medication and detect emergencies Other Six-sensor glove: Movement and gesture recognition 14 DTU Informatics, Technical University of Denmark
15 Outline Wireless Sensor Networks Types and Topologies Applications System Issues and Standards Energy Harvesting 15 DTU Informatics, Technical University of Denmark
16 Operating System and Standards Standards for Low-Rate Wireless Personal Networks (LR-WPN) IEEE Defines the PHY and MAC layers Zigbee Defines the NET and APP layers TinyOS, Contiki Operating systems designed for sensor networks 16 DTU Informatics, Technical University of Denmark
17 Challenges: Networking Networking Efficient routing (i.e. path selection) in mutli-hop networks In terms of energy consumption / performance Duty cycling Sleeping schedule to save energy Efficient MAC protocols Must not waste energy in idle listening / overhearing Efficient Transmission Power selection 17 DTU Informatics, Technical University of Denmark
18 Challenges: Localization Localization The problem of determining a node s position Challenging in unstructured topologies Important for applications, routing protocols (e.g. geographic routing) Straightforward solution: GPS But, requires line of sight to satellites, consumes energy, increases cost Alternative estimation approaches E.g. Received Signal Strength Indicator (RSSI) methods 18 DTU Informatics, Technical University of Denmark
19 Challenges: Synchronization Synchronization The problem of assuring that different nodes have a common notion of time Important for applications (correlating data) and networking protocols (time scheduling, coordinated duty cycles) Known problem of distributed systems Typical solutions are unsuitable due to the limited resources 19 DTU Informatics, Technical University of Denmark
20 Outline Wireless Sensor Networks Types and Topologies Applications System Issues and Standards Energy Harvesting 20 DTU Informatics, Technical University of Denmark
21 Energy Harvesting Battery-powered WSNs Sacrifice performance for lower energy consumption Eventually will die and need battery replacement Often not even possible (e.g. underground sensors) Energy-Harvesting WSNs Extracting energy from the environment Infinite lifetime but energy not always available Energy sources have spatiotemporal variations Batteries operate as energy buffers 21 DTU Informatics, Technical University of Denmark
22 Classification of Energy Availability Uncontrollable but predictable E.g. Solar energy Uncontrollable and unpredictable E.g. Vibrations in an indoor environment Fully controllable E.g. Flush-lights used to generate energy Partially controllable E.g. A deployed energy source 22 DTU Informatics, Technical University of Denmark
23 Energy Sources Electromagnetic radiation Solar power Ambient indoor light Thermal energy Room radiator Machines Body temperature Mechanical energy Wind power, air currents Water flows in natural channels (e.g. rivers) or in pipes Blood flow and breathing Vibrations Acoustic noise High noise levels (e.g. concerts) 23 DTU Informatics, Technical University of Denmark
24 Design Objectives Battery-Based WSNs Maximize the lifetime while maintaining a minimum performance Save as much energy as possible Distribute the tasks and computation load as much as possible Energy-Harvesting WSNs Maximize performance while maintaining energetic sustainability Use the surplus of harvested energy Use the nodes that have access to more energy to cover for nodes that they don t to 24 DTU Informatics, Technical University of Denmark
25 Coming up next.. Part II: Security of Wireless Sensor Networks 25 DTU Informatics, Technical University of Denmark
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