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

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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