摘要
通过对无线传感器网络节点传输能耗模型的分析,在研究时间敏感应用的基础上,提出了一种基于动态门限机制的控制方法.利用采样数据内在的相关性、无硬门限特性,并根据采样数据的发送间隔实现了门限的动态调整,以改进基本的定向扩散算法.仿真实验表明,所提算法能减少节点无线传输的次数,可使无线传感器网络节点的生命期延长30%,它随采样数据的变化动态地调整门限值,从而满足了时间敏感应用的要求,适合于一次性查询和持续性查询.
By analyzing the model of transmission energy consumption of the WSN nodes and on the basis of study on time-sensitive applications, a control algorithm based on dynamic threshold mechanism is presented to improve the directed diffusion algorithm. Utilizing the inherent correlation of sample data and non-hard threshold and after realizing the dynamical adjustment of threshold according to the transmission interval of sample data, the basic directed diffusion algorithm is improved. Simulation studies demonstrate that the proposed algorithm can decrease the wireless transmission times so as to extend the lifetime of sensor nodes of WSN by more than 30%. It can adjust the threshold dynamically with changing of sample data, and thereby satisfy the requirements of time-sensitive application, and it is suitable for one-off and persistent queries.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2007年第12期1411-1413,1422,共4页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(60472074)
国家高技术研究发展计划资助项目(2005A121130)
关键词
无线传感器网络
定向扩散
时间敏感
动态门限
wireless sensor network
directed diffusion
time-sensitive
dynamic threshold
