一种基于SDN的ICN高效缓存机制  

Efficient Caching Mechanism Based on Soft Defined Information-centric Networks

作　　者：雷方元[1] 蔡君[1] 罗建桢 戴青云[1] 赵慧民[1] LEI Fang-yuan CAI Jun LUO Jian-zhen DAI Qing-yun ZHAO Hui-min(School of Electronic and Information, Guangdong Polytechnic Normal University, Guangzhou 510665, China)

机构地区：[1]广东技术师范学院电子与信息学院,广州510665

出　　处：《计算机科学》2016年第8期74-78,83,共6页Computer Science

基　　金：国家自然科学基金资助项目(61571141);广东省自然科学基金资助项目(2014A030310346;2015A030313672);广东省教育厅省级重大资助项目(2014KZDXM060)资助

摘　　要：内置缓存是信息中心网络(ICN)架构最核心的思想之一。为了充分、高效地利用全网缓存资源,提出了一种基于SDN的ICN高效缓存机制(SIC)。该方法利用SDN控制面感知全网状态,在SDN控制面中根据ICN缓存节点的网络社团重要度特性以及社团节点重要度特性来生成缓存策略,使不同流行度的内容对象在各社团之间和同一社团内节点上的分布更合理。在多种实验条件下对SIC策略进行了仿真验证,结果表明与Hash+LRU、Betw+LRU相比,该策略能更好地提升缓存命中率、跳数减少率、平均社团经过个数,同时SDN的资源开销保持在较低的水平。In-network caching is one of the most important features of ICN （information-centric networks）. A caching strategy based on soft defined information-centric network was proposed to efficient utilize the whole network cache re- source. In control plane, SDN controller aware the dynamic network status, the caching mechanism not only considers the importance of the cache community but also the node＇s importance within a cache community, which makes different popularity of content objects more reasonable in temporal distribution. The SIC mechanism was implemented under a variety of experimental conditions, and compared with the previous strategies Hash-LFU and Betw＋ LRU. The simula- tion results show that the mechanism can yield a significant performance improvement, such as, average request delay, cache hit ratio, hop reduction ratio, average community, and the resource overhead of SDN controller also keep the low level.

关 键 词：软件定义网络 信息中心网络 缓存 替换 节点社团重要度 

分 类 号：TN915.9[电子电信—通信与信息系统]