一种基于节点社团重要度的信息中心网络缓存决策策略

Cache Decision Strategy Based on Node's Importance to Communities in Information Centric Networking

节点缓存决策策略是信息中心网络(ICN)中缓存技术研究的核心问题之一.针对ICN提案的CEE方案的较大冗余和改进的Betw方案不能满足高介数节点线速处理要求等问题,提出一种基于节点社团重要度的节点缓存决策策略(CDS-NIC策略),将内容缓存到用户最容易获取的社团内的节点处.在多种实验条件下对CDS-NIC策略进行了仿真验证,结果表明该策略与CEE方案和Betw方案相比,能更好地提升包括缓存命中率、跳数减少率、内容差异性及替换数量等在内的网络缓存性能指标.

The node＇s cache decision strategy is one of the core issues about cache technology research in information centric networks （ICN）. Considering that the CEE scheme produces a great of redundancy and the nodes with high betweenness cannot meet the requirements to the wire-speed processing in ICN, a novel in-network cache decision strategy is proposed based on node＇s importance to communities （ CDS-NIC ） and the contents can be pushed to the pace where the user most easily acquired. Under a variety of experimental conditions, the simulation results show that the NIC strategy,comparing with CEE scheme and Betw scheme, can improve the network cache performance ,including the cache hit rate, hop reduction ratio, content diversity ratio and the number of replacement.