EECE 621: Wireless Sensor Networks

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EECE 621Wireless Sensor Networks

• Prof. Sunggu Lee
• EE Dept., POSTECH

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Course Introduction

• Objective To learn about the emerging field of
  Wireless Sensor Networks
• Grading 30 midterm, 30 final, 40 project
• Home Page www.postech.ac.kr/class/eece621-01
• Course Textbook Shih-Lin Wu and Yu-Chee Tseng,
  Wireless Ad Hoc Networking, Auerbach Publications
  (Taylor and Francis), Boca Raton, 2007.
• Reference Textbooks
• Feng Zhao and Leonidas Guibas, Wireless Sensor
  Networks, Elsevier (Morgan Kaufmann), San
  Francisco, 2004.
• Research papers in this area
• Contact slee_at_postech.ac.kr,Office 2-403 Phone
  279-2236

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Course Syllabus

• Syllabus based on course textbook
• 1. Introduction to Wireless Sensor Networks
  (WSNs) short overview
• 2. Sensor Coverage and Connectivity of WSNs Ch.
  1
• 3. Communication Protocols Ch. 2
• 4. Hardware Platforms Ch. 3
• 5. Energy Conservation Techniques Ch. 4, 14
• 6. Security in WSNs Ch. 5
• 7. Autonomous Swarm-Bot Systems for WSNs Ch. 6
• 8. WSN Applications Ch. 7
• 9. Localization Techniques Ch. 9
• 10. Channel Assignment Methods Ch. 8, 10
• 11. Multi-Channel MAC Protocols Ch. 11
• 12. Quality of Service for Wireless Ad Hoc
  Networks Ch. 12-13
• 13. Opportunities for Research related to WSNs
  research papers, other

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Intro to Wireless Sensor Networks

• Wireless Sensor Network (WSN)
• A wireless network of small computing devices
  with embedded sensors
• Also referred to as a Ubiquitous Sensor Network
  (USN)
• Integration of several different technologies
• Sensors used to convert various sensed signals
  (temperature, humidity, pressure sound,
  magnetism, light, etc.) into digital values
• Network management (link creation, routing,
  multicasting, etc.) for ad-hoc networks created
  using wireless links
• Application programs that can combine the raw
  data provided by various distributed sensors into
  useful information
• Many interesting research issues related to WSNs

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Example WSN Applications

• Counter-sniper System
• Vanderbilt University
• Determine sniper locationto within a building
  window
• lt MICA2 mote gt
  IEEE Computer, 2003
• Habitat monitoring
• Great Duck Island (GDI)
• UC Berkeley
• Sense temperature and humidityvariations in bird
  nests to studybehavior of special birds (petrels)

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Examples of WSN Devices (1/2)
LWIM III UCLA, 1996 Geophone, RFM radio, PIC,
star network
AWAIRS I UCLA/RSC 1998 Geophone, DS/SS Radio,
strongARM, Multi-hop networks
WINS NG 2.0 Sensoria, 2001 Node
development platform multi- sensor, dual
radio, Linux on SH4, Preprocessor, GPS

• UCB Mote, 2000
• 4 Mhz, 4K Ram
• 512K EEProm,
• 128K code, CSMA
• half-duplex RFM radio

Processor
D. Estrin, MOBICOM 2002 Tutorial
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Examples of WSN Devices (2/2)
COTS-BOTS (UCB)
UCLA iBadge
iPAQ with CF cards
M. Srivastava, MOBICOM 2002 Tutorial
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WSN Research Issues

• Sensor node coverage
• Ensuring communication connectivity
• Communication issues
• Ensuring connectivity
• Communication protocols
• Routing, multicasting, broadcasting
• Time synchronization of WSN nodes
• Localization determining 2-D or 3-D positions
  of WSN nodes
• Energy conservation - coordination of sleep/wake
  cycles while maintaining coverage, connectivity
• Security
• Channel assignment/scheduling for effective
  communication
• Research-related issues for specific WSN
  applications, etc.