基于PIT相似性的VANET混合协同缓存策略

VANET Hybrid Collaborative Caching Strategy Based on PIT Similarity

针对车载自组织网络存在内容重复传输和访问时延长的问题,设计一种基于待处理请求表(PIT)相似性的混合协同缓存策略。依据中心节点PIT相似度,给出自适应构建缓存社区的方法。采用虚拟分布式哈希表实现相似区域的缓存调度,并在区域外采用下游节点保留副本策略实现混合协同。实验结果表明,与ICN经典缓存算法相比,该策略能够以较低的通信开销和存储代价,降低网络负载和节点缓存操作频度,提高缓存利用率。

Aiming at the problem of repeated content transmission and long access delay in the Vehicular Ad Hoc Network(VANET),a hybrid collaborative caching strategy based on the similarity of Pending Interest Table(PIT)is designed.According to the PIT similarity of the central node,a method for adaptively building a caching community is given.The Virtual Distributed Hash Table(VDHT)is used to implement the buffer scheduling of similar areas,and the Leave Copy Down(LCD)strategy is used outside the area to achieve hybrid clooaboration.Experimental results show that compared with the classical ICN cache algorithm,this strategy can reduce network load and node caching operation frequency with a small amount of communication and storage cost,and improve caching utilization.