关键词: 无线传感器网络 梯度部署 随机部署 覆盖度 网络生存期

Abstract:

All data traverse through the network and aim to the sink in a large-scale, randomly-deployed wireless sensor network, the nodes closer to the sink switch more data and run out of energy more quickly than others. When the network fails due to the failure of the nodes near the sink, the outer nodes rem ain abundant energy resulting in low-energy efficiency. In this paper, we present a Maximize Lifetime Placement problem, which minimizes the cost of net works, and then analyze the characteristics of data collection and coverage in randomly-deployed sensor networks. The gradient node placement is propose d to solve the problem and the basics of the method is the node density decreases with the growing distance to the sink. Compared with the random placem ent, the gradient placement saves nodes and improves the energy utility. At last, a simulator is designed to evaluate the performance of the gradient no  des placement.

Key words: wireless sensor network, gradient placement, random placement, coverage, network lifetime