Approximate Location Management in Sensor Networks

• Main Authors: Cheng-En Wu, 吳承恩
• Other Authors: Jiun-Long Huang
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/63176296592927360537

碩士 === 國立交通大學 === 網路工程研究所 === 96 === Location management is an important issue of wireless sensor networks in the recent years. The location data storage management scheme of object tracking will affect the energy efficiency of sensor nodes since the transmission is the main factor of power consumption. Therefore, we propose an approximate location management scheme with dynamic servers to reduce the total message count of networks. Since some users can tolerate the imprecision location data, they send query messages with an error bound. Then the location servers can reply an imprecision location data to users and the targets need not to send update messages all the time. So we can utilize the approximate queries to reduce the update message cost. In the previous works, the positions of servers are fixed. Therefore, we also propose the dynamic servers scheme. The dynamic servers are storages which store the location data of targets and adjust their positions according to the message flow. To evaluate the performance of the proposed scheme, several experiments are conducted. The experimental results show that we reduce the message count, save the energy consumption, and balance the load.