无线传感器网络基于虚拟节点的小波压缩方法

Virtual Nodes-Based Wavelet Compression Algorithm for Wireless Sensor Networks

除了能量受限以外,有限的存储容量也是无线传感器网络的基本特征.研究传感器网络中节省存储的数据传输问题,提出了一种基于虚拟节点的渐进数据传输方法.首先定义虚拟节点并建立各级虚拟节点之间的对应关系,充分利用传感数据的相关性;然后,设计基于此映射关系的传感数据调度算法,单轮传送数据的节点总数由相应簇头的实际存储容量决定,虚拟节点对每轮收集到的数据进行联合编码,形成节省存储的渐进数据传输.模拟实验表明,所提出的算法比DIMENSIONS有更小的网络耗能和延时,而且具有存储有效性.

In a wireless sensor network （WSN）, the battery is not only limited to, but is also the storage memory. To reduce the requirement of a capacity of the memory in data transmissions, a visual node based progressive data transmission protocol is proposed. First, the concept of a virtual node is introduced. Next the relationships among the virtual nodes are constructed aiming at making full use of sensory data dependence. Second, based on those relationships, a virtual nodes scheduling algorithm is proposed. In a certain data transmission round, the number of cluster members that are scheduled to transmit data is determined accordingly to the memory size of its corresponding cluster-head. The cluster-head collects the data and encodes them jointly, and the progressive memory efficient data transmission is formed. Theoretical analysis and experiment results show that this proposed method can further save energy consumption and has minimal delay compared to DIMENSIONS. More importantly, it is memory-efficient.