Efficient Sensor Placement Approach for Wireless Sensor Networks

• Main Authors: Chia-Pin Peng, 彭嘉斌
• Other Authors: Ben-Jye Chang
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/v749rd

碩士 === 朝陽科技大學 === 網路與通訊研究所 === 93 === Recently, wireless sensor networks have become a new technique and popular research issues. A wireless sensor network consists of a large number of sensor nodes that have the capabilities of sensing, computing, and wireless transmission. Wireless sensor networks assist people to work under danger situations for supporting continuous tasks, such as monitoring, observing targets, and tracking on dynamic moving objects while decreasing failure risk. Although wireless sensor networks have been studied extensively, several problems should be addressed, including the sensors placement policy, the data aggregation or fusion issue, and realizable applications. However, one of important issues is the placement policy of sensor nodes. Most studies have proposed the probability-based placement policies for monitoring an overall area. In fact, not entire area is interested to be sensed/monitored. Additionally, the fully monitoring of an entire area causes several disadvantages – high cost of placing large number of sensors, long delay of data transmission, slow response, and unnecessary data aggregation. Furthermore, previous works lacked consideration of the difference between the sensing radius and the transmission radius that might result in inaccurate analysis. Therefore, we propose herein an efficient sensor placement approach (ESP) for a sparse interested area with considering of obstructers that block the data transmission among sensors; meanwhile, the issue of difference radius of sensing and transmission is analyzed in detail. Numerical results demonstrate that the proposed ESP approach requires the least number of sensor nodes under various network sizes and number of obstacles. Moreover, simulation results also indicate that the number of obstacles decreases when the sensing or transmission radius increases.