基于效用的机会网络缓存替换策略

Cache Replacement Policy Based on Utility for Opportunistic Network

机会网络具有节点流动性较大、数据时延长、资源有限等特点,如何合理和高效地使用节点提供的缓存资源、增加节点间的协作来减少机会网络时延、节省带宽、防止拥塞是一个关键问题.通过对机会网络缓存策略研究,提出了基于效用的概率缓存替换策略,该策略分别计算数据的流行度和最短机会路径的权重,得出节点的效用值,通过比较效用值确定了节点要缓存的数据.实验结果表明提高了节点获取资源的成功率并减少了协作缓存资源请求的平均响应时间.

Opportunity to network with node mobility, data extension, limited resources, etc., how rational and efficient use of the cache node provides resources to increase cooperation between nodes to reduce the opportunities for network delay, save bandwidth, to prevent congestion is a key problem. Through the opportunity to network caching policy research, the utility-based probabilistic cache replacement policy that popularity data were calculated and the shortest path opportunities weights derived node utility value,determined by comparing the utility value of data to be cached. Experimental results show that it improved access to resources node from the neighbor＇s success rate, and reduced the average cooperative caching resource request response time.