Abstract: Caching and prefetching play an important role in improving the performance of wireless Web access. In this paper， Web caching and prefetching scheme for wireless local area network are studied. The authors present the sequence-mining and lazy-update prediction algorithms respectively based on data mining and information theory， design a context-aware prefetching algorithm and a profit-driven caching replacement policy， and then implement them in Web caching system OnceEasyCache. Performance evaluation experiment results show the integration of the above algorithms can effectively enhance cache hit ratio and delay saving ratio.

Key words: Web caching, prefetching, context-aware, integrated scheme

摘要： 缓存和预取在提高无线环境下的Web访问性能方面发挥着重要作用。文章研究针对无线局域网的Web缓存和预取机制，分别基于数据挖掘和信息论提出了采用序列挖掘和延迟更新的预测算法，设计了上下文感知的预取算法和获益驱动的缓存替换机制，上述算法已在Web缓存系统OnceEasyCache中实现。性能评估实验结果表明，上述算法的集成能有效地提高缓存命中率和延迟节省率。

关键词: Web缓存, 预取, 上下文感知, 集成机制