Wireless Sensor Network

INDEX

1. INTRODUCTION 1

1.1 Wireless sensors Deployment 2

1.2 Wireless Sensor and Actor Networks 3

1.3 The Physical Architecture of WSANs 3

1.4 Difference between WSNS and WS 4

1.5 Requirement of WSNs 5

2. Wireless Ad-Hoc Network 5

3. Current Issues and solution 6

3.1 Key management issue for future 9

4. Advantages, Disadvantages and Applications of WSNs 10

5. Conclusion 11

6. References 12

List of figures

Figure 1 Working principle of WSNs 1

Figure 1.3 The Physical Architecture of WSANs 4

Figure 1.3.1 (a) Automated Vs (b) Semi-Automated 4

Figure 3 (a) Example of coverage problem: The sensing ranges are unit disks 7

Figure 3 (b) The sensing ranges are non-unit disks 7

Figure 3.1(a) the coverage problem with irregular sensing region

(a) Coverage levels of irregular sub-regions

(b) Polygon approx. of sensor Si sensing region

(c) Covered segments of sensor Si 8

Figure 3.1.1 Security Requirements for WSN 9

Figure 3.1.2 Common key distribution schemes for WSNs 9

Figure 4 Applications 11

Introduction

Wireless Sensor Network

The rapid progress of embedded MEMS (micro-sensing technologies) and wireless communication has made wireless sensor networks possible. Such an environment may have many wireless nodes which are inexpensive; each node is capable of collecting, storing and processing environmental data, and communicating with neighboring nodes. These sensors are connected with wires in the past but tod...

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... in Wireless Sensor Networks: Current proposal and Future Development, IEEE Xplore, Hong Kong, Oct- 2007.

5) Jeremy Eric Elson, “Time Synchronization in Wireless sensor Networks, University of California, USA: ANSII Std 239-18, 2003.

6) Michele Zorzi, “Wireless Sensor and networks: Recent trends and Research Issues’’, University of Padova, Italy, IEEE communication society, Poland, April 28-30, 2008.

7) CHI-FU HUANG and YU-CHEE TSENG, “Mobile Network and Application”, the coverage Problem in a Wireless Sensor Network, National Chiao-Tung University, Taiwan, Netherland, senior member of IEEE, 2005, Sec. 5.

8) Ian F. Akyildiz, Ismail H. Kasimoglu, “Ad Hoc Networks’’, Wireless sensor and actor networks: Research Challenges, Georgia Institute of Technology, USA, May-2004.

9) Salvatore La Malfa, “Wireless Sensor Networks”, IEEE Xplore, 2010.