内容中心网络中传输开销最小的协作缓存策略

摘要

针对现有缓存策略主要从用户角度对网络性能（缓存命中率、内容获取时延等）进行优化，而没有考虑网络为用户提供服务时的传输开销优化问题，提出了一种最小化内容中心网络中传输开销的协作缓存机制。首先，给出了内容中心网络中内容缓存价值的计算方法，并利用内容缓存价值来衡量缓存为网络传输开销带来的影响；然后，在此基础上给出了最小化内容中心网络传输开销的缓存决策策略及缓存替换策略；最后，利用 ndnSIM 对所提缓存策略进行仿真。仿真结果表明，与现有缓存机制相比，所提策略能够有效减少网络传输开销。%The current caching strategies mainly concern about the performance CCN from the user perspective ,without considering the problem of transmission cost when the network pro‐vides service for users .To overcome this problem ,a caching strategy is proposed for minimiza‐tion of the transmission cost of CCN .First ,a method is presented to calculate the cache value of content ,and use the cache value to measure the effect of cache on the network transmission cost . T hen ,the cache decision and cache replacement strategies for minimizing the transmission cost are represented based on the cache value of content . Finally , simulation experiment based on ndnSIM demonstrates that compared with existing strategies ,the proposed strategy can signifi‐cantly decrease the network transmission cost .