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Real-Time and Reliable Wireless Sensor Networks for Smart Wireless Automation Applications
 

Real-Time and Reliable Wireless Sensor Networks for Smart Wireless Automation Applications

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    Real-Time and Reliable Wireless Sensor Networks for Smart Wireless Automation Applications Real-Time and Reliable Wireless Sensor Networks for Smart Wireless Automation Applications Presentation Transcript

    • Real-Time and Reliable WSNsfor Smart Wireless Automation Applications
      Maurizio Bocca, M.Sc.
      Department of Automation and Systems Technology
      Aalto University School of Electrical Engineering
      www.wsn.tkk.fi
    • 1
      WSNs Applications
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Wireless Automation Challenges
      Energy efficiency:
      Guarantee an extended lifetime of the system
      Scalability:
      Cope with a large and varying number of nodes
      Reliability:
      Packets must arrive at destination
      Timeliness:
      Fulfill the deadlines of the monitored industrial processes
      2
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Outline
      3
      TSMP-Lite Initialization
      RNP Protocol
      Device-Free Tracking
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • TSMP-Lite Initialization
      TSMP-Lite: Time Synchronized Mesh Protocol for WSNs applications
      Network initialization procedure:
      Neighbors discovery and connectivity graph
      Useful to adjust the routes in case of nodes failures
      Link quality evaluation and topology definition
      High-accuracy time synchronization
      For energy-efficient multi-channel time-slotted communications
      4
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Case Study: Industrial Environment
      5
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Case Study: Greenhouse
      6
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Real-Time Networking Protocol
      Mesh networking based on nodes cooperation:
      Transmission in broadcast mode based on network status
      Packet forwarding over multiple hops by pyggybacking
      Redundant paths to be utilized when required
      Base for reliable wireless data transfer
      7
      Network status related information
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • RNP MAC and PHY Layers
      TDMA and CSMA hybrid channel access:
      TDMA to control delays and introduce determinism
      CSMA for avoiding collisions and improving coexistance with other systems
      Antenna diversity:
      Additional redundancy at the physical layer
      Reduces link failures and need for retransmissions
      Improves reliability and decreases latency
      8
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Case Study: Industrial Environment
      9
      NO antenna diversity
      WITH antenna diversity
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Device-Free Tracking
      A person crossing a LoS link between two nodes causes shadowing of the radio signal
      Movement in the close proximity of the nodes causes multipath fading
      Distributed processing of the RSSI:
      RSSI signals are processed locally in the nodes to detect significant changes
      The nodes transmit to the sink only information concerning significant events
      High-accuracy time synchronization
      10
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • DF Tracking Performance (1/2)
      Alarm notifications received from the network processed at the sink
      Tracking performance improved by applying a Kalman filter
      Experimental setup:
      12 nodes covering 36 m2
      Average error: 0.17 m
      11
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • DF Tracking Performance (2/2)
      Distributed RSSI processing reduces the communication overhead
      Alarm notifications account only for 7.18 % of the total number of broadcasts
      Through time synchronization, the radio is enabled for:
      TX slot: 2.30 ms
      RX slot: 4.05 ms
      Extended system lifetime
      12
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Conclusions
      The use of WSNs in industrial environment brings several advantages:
      Possibility to deploy a high number of sensors/actuators at a reduced cost
      Improved screening capability
      Reduction of installation time and costs
      Ease of maintenance
      Industrial applications are expected to increase significantly in number over the next years
      13
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • A Look at the Future
      14
      “The Economist”
      December 2010
      Maurizio Bocca - Automaatio XIX, Helsinki, 16.3.2011
    • Thank You!
      15
      Questions?
      maurizio.bocca@tkk.fi
      http://autsys.tkk.fi/MaurizioBocca