A Cluster-based Slot Allocation Adjusting Protocol for Wireless Sensor Networks

• Main Authors: Jian-Kai Wang, 王建凱
• Other Authors: Ru-Sheng Liu
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/54461816569032282069

碩士 === 元智大學 === 資訊工程學系 === 94 === Wireless sensor networks typically consist of a large number of low cost sensor nodes, which can collaborate among each other to enable a wide range of applications such as environmental monitoring, intrusion detection and disaster management … etc. Since the sensor nodes must sense and transmit data for a long period of time, wireless sensing devices are seriously restricted by their limited energy supply. Therefore, many researchers are working on how to manipulate the sensor nodes energies efficiently and extend the whole network lifetime. The issues of fairness and delay time are relatively not so important. In this paper, we will develop a TDMA based Medium Access Control (MAC) mechanism on cluster infrastructure to achieve the maximum power saving. Through adjusting time slot allocation in advance, our mechanism tries to avoid the collisions resulting from the transmissions between clusters as much as possible. Then, we may reduce a lot of energy consumption on retransmitting. Finally, through the MAC protocol coupled with TDMA, each sensor node may wake up at the fixed time slot and turn into the sleep mode for a long time. Therefore, our mechanism will save the energies efficiently and extend the whole network lifetime.