摘要
提出一种能量有效的按需缓存策略BESS,中间节点收到源节点到sink节点数据包后,用二分法根据节点位置选择缓存节点;并由节点剩余能量和能量阈值判断是否应该存储数据项,能量阈值根据每个节点缓存数据项个数不同动态确定;缓存替换中通过建立模型得到影响缓存发现能量的一些因素,根据这些因素构造出缓存替换策略的权值函数.仿真结果表明,与已存在的GCCS策略相比,平均时延降低4.8%～31.6%,平均能耗减少15.1%～35.6%,缓存字节命中率提高3.64%～8.16%.
An energy efficient method of on-demand caching strategy named BESS was presented.We selected cache nodes according to node location by dichotomy when the route node received the packets from source nodes to sink nodes.We compared the node residual energy and threshold energy to decide whether the cache nodes should store data items.The threshold energy was determined dynamically on the basis of different data item number of each cache node.In caching replacement,we established a model to get some influence factors of cache founding energy.Then according to these factors,we constructed a weight function.Simulation results showed that the average delay reduces 4.8% ～31.6%,the average energy consumption decreases 15.1%～35.6%,and the cache byte hit ratio increases 3.64%～8.16%,compared with the GCCS.
出处
《中国计量学院学报》
2013年第3期290-297,303,共9页
Journal of China Jiliang University
关键词
无线传感器网络
能量有效
缓存节点
缓存替换
wireless sensor networks
energy efficient
cache node
caching replacement
