Slide 12009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
Energy Efficient Com...
Slide 22009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
OUTLINEOUTLINE
• Int...
Slide 32009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
APPLICATION AREAAPPL...
Slide 42009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
SYSTEM REQUIREMENTSY...
Slide 52009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
Mobile Directive Syn...
Slide 62009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
STATE DIAGRAMSTATE D...
Slide 72009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
DISCOVERY PHASEDISCO...
Slide 82009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
REGIME PHASEREGIME P...
Slide 92009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
Rate 250 Kbps
Number...
Slide 102009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
RELATIVE LIFETIME G...
Slide 112009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
COLLISION PROBABILI...
Slide 122009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
LATENCYLATENCY
Slide 132009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA.
CONCLUSION AND FUTU...
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Energy Efficient Communications Solutions for Nomadic Nodes within a Wireless Sensor Networks

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Presently, wireless sensor networks most challenging applications are related to mobile sinks or even nodes, monitoring and intervening in critical areas. To this end, proper communications protocols design plays a crucial role in fulfilling user requirements. In the following, the benefits of adopting directive antennas, both in terms of energy saving and targets tracking are presented by integrating this feature into a novel MAC protocol (MD-STAR). Simulation results are also deeply provided, underlining higher performance of MD-STAR with respect to existing solutions, for different directive main lobe width and node density values.

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Energy Efficient Communications Solutions for Nomadic Nodes within a Wireless Sensor Networks

  1. 1. Slide 12009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. Energy Efficient Communications Solutions for NomadicEnergy Efficient Communications Solutions for Nomadic NodesNodes Within a Wireless Sensor NetworksWithin a Wireless Sensor Networks Luca Bencini, Francesco Chiti, Giovanni Collodi, Davide Di Palma, Romano Fantacci, Antonio Manes, Gianfranco Manes Department of Electronics and Telecommunications – University of Florence
  2. 2. Slide 22009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. OUTLINEOUTLINE • Introduction • Application area • System Requirement • Mobile Directive Synchronous Transmission Asynchronous Reception Protocol • Proposed MAC Protocol • State Diagram • Discovery phase • Regime phase • Performance Analysis • Relative lifetime gain • Collision probability • Latency • Conclusion and future development
  3. 3. Slide 32009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. APPLICATION AREAAPPLICATION AREA • habitat monitoring • healthcare applications • home automation • traffic control • robot applications (DustBot) nomadic Wireless Sensor Network application areas
  4. 4. Slide 42009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. SYSTEM REQUIREMENTSYSTEM REQUIREMENT • low power consumption • low latency • low collision probability • good synchronization between nodes and nomadic nodes cross-layer protocol MD-STAR
  5. 5. Slide 52009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. Mobile Directive Synchronous Transmission Asynchronous Reception Protocol MD-STAR protocol: • is a novel cross-layer protocol • allows the managements of smart antennas • takes into the account the antenna capabilities (directivity) • allows achievement of space-time synchronization for mobile nodes in mesh topology networks MD-STAR PROTOCOLMD-STAR PROTOCOL
  6. 6. Slide 62009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. STATE DIAGRAMSTATE DIAGRAM INIT OFF DISCOVER Y REGIME Switch on fdf Nn < fdf Nn = sNremptysecto = lowbatterybattery _< lowbatterybattery _< sNremptysecto =≤1
  7. 7. Slide 72009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. DISCOVERY PHASEDISCOVERY PHASE init off discove y regime Switch on fdf Nn < fdf Nn = sNremptysecto = lowbatterybattery _< lowbatterybattery _< sNremptysecto =≤1 time fupset TT 2≥− slf TTT += slf TTT += 2 4 5 3 2 4 1 ID-node phase secto r 2 T-phase 3 ID-node phase secto r 2 T-phase 3 3 ID-node phase secto r 2 T-phase 4
  8. 8. Slide 82009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. REGIME PHASEREGIME PHASE init off discove y regime Switch on fdf Nn < fdf Nn = sNremptysecto = lowbatterybattery _< lowbatterybattery _< sNremptysecto =≤1 time fT lT fT lTsT sT 4 2 3 5 ID-node phase secto r 4 T-phase 3 1 23 42 3 2 4 1 ID-node phase secto r 2 T-phase 2 ID-node phase secto r 2 T-phase 2 ID-node phase secto r 2 T-phase 2
  9. 9. Slide 92009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. Rate 250 Kbps Number of nodes [10, 15, …., 50] Number of angular sector [1, 2, 4, 6, 8] Monitored area 25 m x 25 m Velocity of mobile node [4,1 : 5,1] m/s PERFORMANCE ANALYSISPERFORMANCE ANALYSIS • mobility model: Random Waypoint Model (RWM) • antenna model: ideal Switched Beam antenna Parameter considered to evaluate the performance of MD-STAR: • relative lifetime gain • collision probability • latency
  10. 10. Slide 102009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. RELATIVE LIFETIME GAINRELATIVE LIFETIME GAIN
  11. 11. Slide 112009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. COLLISION PROBABILITYCOLLISION PROBABILITY
  12. 12. Slide 122009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. LATENCYLATENCY
  13. 13. Slide 132009 Radio & Wireless Symposium, San Diego, CA.2009 Radio & Wireless Symposium, San Diego, CA. CONCLUSION AND FUTURECONCLUSION AND FUTURE DEVELOPMENTDEVELOPMENT CONCLUSION: • MD-STAR protocol is suitable for the management of mesh topology networks in presence of nomadic nodes. • MD-STAR protocol satisfies the system requirement of low power consumption, low latency and low collision probability. FUTURE DEVELOPMENT: • modify MD-STAR algorithm to manage mobile nodes using a phased array antenna model.

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