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WIRELESS SENSORS NETWORK

WIRELESS SENSORS NETWORK. anywhere and everywhere. omnipresent. WIRELESS SENSOR NETWORK.

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WIRELESS SENSORS NETWORK

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  1. WIRELESSSENSORSNETWORK

  2. anywhere and everywhere. omnipresent

  3. WIRELESS SENSOR NETWORK A sensor network is an infrastructure comprised of sensing (measuring), computing, and communication elements that gives an administrator the ability to instrument, observe, and react to events and phenomena in a specified environment The environment can be the physical world, a biological system, or an information technology (IT) framework. .

  4. WSN node components Low-power processor. Limited processing. Memory. Limited storage. Radio. Low-power. Low data rate. Limited range. Sensors. sensors: temperature, light, etc. Cameras, microphones. Power. P O W E R Sensors Storage Processor Radio WSN device schematics

  5. Sensor networking is a multidisciplinary area that involves, among others, radio and networking, signal processing, artificial intelligence, database management, systems architectures for operator-friendly infrastructure administration, resource optimization, power management algorithms, and platform technology (hardware and software, such as operating systems)

  6. Technological Standard Created for Control and Sensor Networks Based on the IEEE 802.15.4 Standard Created by the ZigBee Alliance Named for erratic, zig-zagging patterns of bees between flowers Symbolizes communication between nodes in a mesh network What is ZigBee?

  7. ENGINEERING DESIGN RESEARCH CHALLENGES

  8. Engineering Challenges ● Identification of several simultaneous events & reliable correlation of information from neighboring nodes ● Classification of objects & events ● Improved integration of different sensor types ● Miniaturization & better robustness of sensors ● Common formats & standards for sensor data communication

  9. Network should be scalable Flexible and hierarchical architectures should accommodate the requirements of both heterogeneous and homogeneous infrastructure flat single-tier network of homogeneous sensor nodes Multi-tier heterogeneous approaches (clustering/partitioning) resource-constrained low-power elements are in charge of performing simpler tasks, such as detecting scalar physical measurements resource-rich high-power devices (such as gateways) perform more complex tasks Network Architecture

  10. Heterogeneity. • Devices with varied capabilities. • Different sensor modalities. • Hierarchical deployments. • Adaptability. • Adjust to operating conditions and changes in application requirements. • Security and privacy. • Potentially sensitive information. • Hostile environments. Design Challenges (Cont’d)

  11. 2012 • Research Challenges • ● Increase WSN usability, flexibility & security • ● Security: reputation approaches • ● Endurance: energy harvesting, efficiency • ● Coverage & connectivity improvement: • sensing & communication range • (yet covert, small EM emission) • ● Information processing, fusion & knowledge: • related to coverage for reliable correlation • of info across space & time • to perform data mining, knowledge engineering • ●Optimum communications schemes • ● Optimum protocols • ● Optimum Hierarchical deployments.

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