车联网中面向时效信息的动态内容推送策略  

Dynamic Content Push Strategy for Time-Sensitive Information in Internet of Vehicles

作　　者：孙养龙 唐余亮[2] 张建鑫 SUN Yanglong;TANG Yuliang;ZHANG Jianxin(School of Navigation Institute,Xiamen University,Xiamen 361005,China;School of Informatics,Xiamen University,Xiamen 361005,China)

机构地区：[1]集美大学航海学院,福建厦门361021 [2]厦门大学信息学院,福建厦门361005

出　　处：《移动通信》2022年第11期34-46,共13页Mobile Communications

基　　金：国家自然科学基金(61731012,61801409)。

摘　　要：针对车联网中海量内容即时交付的需求,研究了车辆协作的无线缓存架构,设计动态内容推送机制,解决高效缓存更新问题;综合车辆分布、内容流行度和文件时效性等要素定义缓存效能,引入非正交多址接入技术实现单时隙多文件推送;以最大化缓存命中率为目标,建立车辆和文件的协同优化问题,提出基于动态规划的交替迭代算法降低求解复杂度。仿真结果表明,所提方案相比传统方案至少降低16.8%的时延。To meet the demand for instant delivery of massive content in Internet of Vehicles(IoV),a wireless cache architecture for vehicle collaboration is investigated,and a dynamic content push mechanism is designed to efficiently solve the cache update problem.Specifically,we define cache efficiency by comprehensively considering such factors as vehicle distribution,content popularity,and file timeliness,and introduce the non-orthogonal multiple access technique to achieve multiple file push at a single slot.In addition,the collaborative optimization problem of vehicles and files is formulated to maximize the cache hit rate,and a lowcomplexity alternative iterative algorithm based on dynamic programming is proposed.The simulation results show that the proposed scheme reduces the delay by at least 16.8%compared with the traditional scheme.

关 键 词：车辆协作 无线缓存 内容推送 动态规划 

分 类 号：TN925.1[电子电信—通信与信息系统]