Novel Deployment Schemes for Mobile Sensor Networks
Abstract
:1. Introduction
2. Analysis of Deficiencies of Virtual Force Algorithm
2.1. Problem Description
2.2. Virtual Force Algorithm
2.3. Analysis of Virtual Force Algorithm
- VFA cannot always guarantee that the distance between sensors is reached at threshold Dth;As shown in Figure 1(a), assuming sensor nodes S1, S2, S3 are located on the vertices of an equilateral triangle, when optimized coverage of ROI is achieved by using VFA. Zhang has demonstrated in [18] that in this case it ensures that not only ROI is fully covered, but also the overlap between sensing regions is minimized. When Node S4 enters the region, as shown in Figure 1(b), S4 moves towards S1, S2, and S3 under VFA. When nodes S2, S3, S4 construct an equilateral triangle, there still exist attractive force between S1 and S4 according to Equation (1). Thus S1 and S4 will continue to move towards each other under the attractive force and consequently fail to keep a force balance in the origin WSNs. In other words, none of the two nodes will stabilize at a desired threshold distance Dth.In fact, both Figure 1(a) and Figure 1(b) reveal that for the given ROI, the movement of S4 cannot increase the coverage ratio. On the contrary, it reduces the coverage rate to some extent. This kind of movement will not only consume the node's energy but make the coverage rate decrease, and thus is a useless move.
- VFA cannot converge to a steady state fastly;For a relatively large scale WSNs, the virtual force relationship given by equation (1) will neither make any two nodes stable at the desired threshold nor make the algorithm converged. Figure 2(a) and Figure 2(b) respectively show the changes of x and y coordinates of sensor nodes under VFA for the WSN with n = 10. It is easy to find that the nodes are not stable and their coordinates are varying all the time, being in an oscillating state.Therefore it is necessary to confine the virtual force between sensor nodes into an effective distance, so that no force is exerted when the distance exceed a certain range, which will facilitate sensor deployment in a fast and stable way. Also when a force effective distance is given in a coverage problem, useless moves are reduced and sensor energy is saved so that the coverage ratio of ROI in the whole networks is increased to some extent.
3. Novel Deployment Schemes for Mobile Sensor Networks
3.1. Improved VFA: IVFA
3.2. Exponential VFA: EVFA
3.3. Performance Evaluation
3.3.1. Coverage Rate
3.3.2. Moving Energy Consumption
3.3.3. Convergence of Deployment Scheme
4. Simulation Results and Performance Evaluation
4.1. Impact of Mobile Sensor Nodes's Number
4.2. Virtual Force Coefficient's influence on performance
5. Conclusions
Acknowledgments
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© 2007 by MDPI
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Chen, J.; Li, S.; Sun, Y. Novel Deployment Schemes for Mobile Sensor Networks. Sensors 2007, 7, 2907-2919. https://doi.org/10.3390/S7112907
Chen J, Li S, Sun Y. Novel Deployment Schemes for Mobile Sensor Networks. Sensors. 2007; 7(11):2907-2919. https://doi.org/10.3390/S7112907
Chicago/Turabian StyleChen, Jiming, Shijian Li, and Youxian Sun. 2007. "Novel Deployment Schemes for Mobile Sensor Networks" Sensors 7, no. 11: 2907-2919. https://doi.org/10.3390/S7112907
APA StyleChen, J., Li, S., & Sun, Y. (2007). Novel Deployment Schemes for Mobile Sensor Networks. Sensors, 7(11), 2907-2919. https://doi.org/10.3390/S7112907