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Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
Supporting the Sink mobility: a case study for WSN
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Supporting the Sink mobility: a case study for WSN

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IEEE ICC 2007 conference presentation

IEEE ICC 2007 conference presentation

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  • 1. Supporting the Sink Mobility: a case study for WSN
      • D.Tacconi , I.Carreras, D.Miorandi, I.Chlamtac,
      • CREATE-NET research centre, Trento, Italy
    http://forum.toronews.net/viewtopic.php?t=240511&postdays=0&postorder=asc&start=0
      • F.Chiti, R.Fantacci
      • DET department, University of Florence
  • 2. Overview
      • Traditional application of WSNs
      • Why WSN with a Mobile Sink?
      • Examples and Applications
      • Proposed Scenario and System Architecture
      • Simulation Results
      • Future Work and Conclusions
  • 3. WSN: Traditional Monitoring
    • Physical phenomenon to be monitored:
      • Microclimate monitoring
      • Red tree forest monitoring:
        • Unique forests of sequoia and red trees
        • Very specific climate: 70% of H2O cycle much upper than ground level
        • Humidity monitoring
    • Fixed Sink, remote connection for data collection and analysis
  • 4. Mobile Sensors and Data Mules
    • Implementations
      • Animals habits monitoring
      • Tree fogs, Switzerland
      • Zebra, Kenya Migration and behavior
      • Wild horses, USA Migration and behavior
    • Fixed collection points, mobile nodes acting as data mules
  • 5. WSN with a Mobile Sink
    • WSN can be queried by car passing by
    • Intelligent Transportation System:
      • Application enhanced by WSN disposed along the road, running on handheld or GPS devices
  • 6. Ice Detection on mountain roads
    • Sensor nodes inserted in the road to sense:
      • Temperature
      • Humidity
    • Multihop communication among nodes on and along the road
    • Car computer system can in advance alert the driver of an incoming iced part of the road
    • Very simple application, increased safety for drivers
  • 7. Parking lot searching Free Parking!
  • 8. System Architecture
    • Sensor Nodes (SN)
      • Sensing a quantity as temperature or parking lot status (free/occupied)
      • Wireless capabilities
      • Position aware (through GPS, distributed localization, position stored)
    • Vice Sink nodes (VS)
      • Nodes disposed along the road
      • No battery limitation
      • Not connected among them in principle
    • Mobile Sink (MS)
      • A car passing by on the road
      • Connected with one VS at the time
      • GPS enabled
    + + Pos=(Lat, Long) + Pos=(Lat, Long)
  • 9. Geographic Query Forwarding
    • MS injects a query packet to the closest VS:
      • Containing MS mobility information, i.e. position, speed and direction (derived by GPS)
      • Indicating the target region with centre coordinates and the maximum radius of interest
    • Query forwarding:
      • The VS starts a Greedy geographic routing toward target region , by selecting the closest SN to the destination
      • The previous step is performed by each SN
      • Once the target region is reached, localized flooding strategy performed by node closer to target region centre
      • The node closest to the centre, prepares Reply packet toward expected MS position
  • 10. Adaptive Geographic Forwarding
    • Reply forwarding
      • Same greedy geographic routing toward the MS expected position
      • The position is adapted step by step according to original MS mobility information
    • Once a VS is reached the replay packet is:
      • Delivered to MS, if it is in radio range
      • Stored for a given amount of time, waiting for the MS to pass by
      • Forwarded toward the next VS, following MS mobility if it has not passed by
  • 11. MS and Geographic Routing Is there a parking lot on that part of the town? Free/Occupied
  • 12.
    • Simulation area:
      • 1000x600 m ²
    • 1 Mobile Sink (MS) moving with random speed among Vmin and Vmax:
      • Vmin = [10 ÷20] m/s
      • Vmax = [20 ÷35] m/s
    • Nvs Vice Sinks (VSs) are equally spaced and always disconnected among them:
      • Nvs = [2 ÷20]
    • NxM Sensor Nodes (SNs) are disposed along a grid and connected to 4 neighbors, with communication radius R=25m:
      • N = 40
      • M = [1 ÷25]
    Simulation set up (Omnet++)
  • 13. Results 1/2
    • Latency of packets vs. Number of Sensors (N=40, M= [1 ÷25]), Nvs=10, Packet Delivery Ratio (PDR)>90%
  • 14. Results 2/2
    • Latency of packets vs. Number of Vice Sinks ( Nvs=[2÷20]), N=40, M= 25 , Packet Delivery Ratio (PDR)>90%
  • 15. Results evaluation
    • Latency remains tolerable while increasing mobility and number of SNs:
      • Proposed adaptive geographic routing is scalable
      • Latency is mainly due to the number of hops for packet delivering
      • Increasing mobility results in a smaller Packet Delivery Ratio (PDR), but always above 90%
    • Are disconnections from the network a problem for packet delivering and latency?
      • In simulations, the MS always experiences disconnections from Nvs=2 to Nvs=20
      • Delay decreases with increased Nvs (less time to look for the MS along the road)
      • Starting from 10 VSs delay do not increase anymore and PDR is always above 90%
  • 16. Conclusions and Future Work
    • Design of a System Architecture to support Mobile Sink querying a WSN
    • Adaptive geographic routing for packet forwarding
    • Routing technique supports MS disconnection from the network due to mobility
    • Next steps:
      • Different topologies
      • Number of MS>1
      • More complex mobility patterns
      • Mobility management strategies
      • Energy consumption evaluation
      • Energy aware techniques
  • 17. Thanks!
    • David Tacconi
    • Research staff member in Pervasive Computing area at CREATE-NET research centre
    • Ph.D. candidate at the University of Florence
    • [email_address]
    • www.create-net.org/~dtacconi

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