Communication Protocols and Middleware Algorithms for Wireless Sensor Networks

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Communication Protocols and Middleware Algorithms
for Wireless Sensor Networks

• David S. L. Wei

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Outline

• Motivation and applications
• Types of sensors
• Network structure
• MAC protocols Wi-Fi, Bluetooth, and
  802.15.4
• Network-Layer protocols Routing and
  Topology Control
• Base station positioning and sensor placement
• Security in wireless sensor networks

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Applications

• range from civilian life to national security
• health care
• traffic control
• industrial automation
• environmental monitoring
• chemical and biological attack detection
• military sensing
• among many others

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Types of Sensors

• video/infrared camera
• gas/smog detector
• seismic wave sensor
• acoustic wave sensor
• chemical- and bioassays
• among others

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Network Architecture

• Single-node architecture
• Network architecture

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MAC Protocols

• CSMA/CA
• 802.11
• 802.15.4
• Frequency Hopping
• Bluetooth/802.15

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Routing and Topology Control

• Routing algorithms power-efficient routing,
  power-aware routing, security-aware routing,
  among others.
• Topology control algorithms see slides of
  another lecture.

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Base station positioning and sensor placement

• Coverage problem answers the questions about QoS
  of surveillance WSNs. Sensor placement determines
  the quality of solutions. Finding optimal
  solution turns out to be NP-complete.
• Base Station Positioning Finding the optimum
  layout of base stations is also NP-complete.

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Security in WSNs

• public-key encryption (e.g. RSA)
• vs
• symmetric-key encryption (e.g. AES)

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• Thank you!
• The speaker can be reached at d.wei_at_cm.nctu.edu.tw
  
• or
• via skype id dslwei