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325

  1. 1. MEDIUM ACCESS CONTROL PROTOCOLS IN WIRELESS SENSOR NETWORKS 報告者:阮文正 老師:劉宏煥 老師
  2. 2. REFERENCE <ul><li>Haopeng Li and Paul D. Mitchell, &quot;Medium Access Control Protocols in Wireless Sensor Networks ,&quot; in 15th ICON, 2007, pp. 455-460. </li></ul>
  3. 3. OUTLINE <ul><li>Main sources of energy waste </li></ul><ul><li>Energy-efficient MAC protocol </li></ul><ul><li>New research scenario </li></ul><ul><li>Link budget </li></ul><ul><li>Conclusion </li></ul>
  4. 4. MAIN SOURCES OF ENERGY WASTE <ul><li>Collision </li></ul><ul><li>Idle listening </li></ul><ul><li>Overhearing </li></ul><ul><li>Overhead </li></ul>
  5. 5. ENERGY-EFFICIENT MAC PROTOCOL <ul><li>Power Aware Multi-Access protocol with Signalling(PAMAS) </li></ul><ul><li>Low Energy Adaptive Clustering Hierachy(LEACH) </li></ul><ul><li>Lightweight MAC(LMAC) </li></ul><ul><li>Sensor MAC(S-MAC) </li></ul>
  6. 6. WSN PROTOCOLS BE SUB-DIVIDED INTO TWO PRIMARY CATEGORIES <ul><li>Schedulebased protocols </li></ul><ul><li>Contention-based protocols </li></ul>
  7. 7. NEW RESEARCH SCENARIO <ul><li>Aerial Platforms (APs) </li></ul><ul><li>such as airships or aircraft carrying communications payloads represent a promising technology to assist with medium access control </li></ul>
  8. 8. LINK BUDGET
  9. 9. CARRIER-TO-NOISE RATIO (CNR)
  10. 10. GAIN
  11. 12. 3DB BEAMWIDTH IN TWO ORTHOGONAL PLANES
  12. 13. AP ANTENNA ARRAY SEGMENT
  13. 17. CONCLUSION <ul><li>The possibility of using aerial platform to relieve the burden of distributed scheduling from the energy constrained nodes has been considered and link budget calculations show that communication between low power sensor nodes and an aerial platform is feasible. More energy-efficient solutions should enable a wider range of applications to be supported by WSNs. </li></ul>

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