基于公交车缓存机制的移动数据分流研究  

Multiple mobile cellular data offloading through bus buffer allocation mechanism

作　　者：姚宏[1] 白长敏[1] 梁庆中[1] 胡成玉[1] 樊媛媛[1] 颜雪松[1] 

机构地区：[1]中国地质大学(武汉)计算机学院,湖北武汉430074

出　　处：《广西大学学报（自然科学版）》2014年第6期1324-1335,共12页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(61272470;61305087);中国地质大学(武汉)中央高校基本科研业务费专项资金资助项目(CUG140615;CUG120114)

摘　　要：为了应对爆炸式增长的车辆流量数据和用户日益增长的应用程序需求给蜂窝网络运营商(如3G/LTE)造成的巨大的流量负载和网络拥塞等问题,当前已有很多工作提出将数据通过高容量的用户设备间通信进行分流。通过蜂窝网络分发数据对象到一部分订阅用户(称为种子用户),由种子用户通过本地机会通信的方式传送给其他订阅用户。为了最大化分流的效率,大多数的工作根据分流的对象和意义,提出了多种分流的方案,但是这些工作大都关注于种子用户的选择问题上。为了研究数据的缓存分配对分流的影响,着眼于城区VANET环境下的数据分流,根据城区多种数据异构的特性,提出利用公交车作为种子用户,通过制定数据缓存分配方案来间接完成数据分流的方案。缓存方案越好,用户命中自己想要的数据的概率就越大,分流的数据量就越多。据此,相应制定出几种贪心的缓存方案,一种启发式方案。通过大量的实验验证了启发式分配方案在分流数据量较多的情况下的优势,同时指出影响数据分流效率的几个重要参数。The explosive growth of the vehicular traffic and the ever-increasing application demands of user cause huge traffic load, network congestion, and the pressure of the cost of maintenance for cellular network operators, such as 3G/LTE. To solve this problem, there have been many efforts to offload the traffic from cellular links to direct high-capacity device-to-device communication among users. The basic idea is to distribute the data object to only part of subscribers （ called seed sources） via the cellular network, and then allow seed sources to propagate the object to other sub-scribers through opportunistic local communications. In order to maximize the efficiency of offload-ing, most of works have studied the various forms of offloading scheme from the perspective of the objects and significance of offloading, but these works are mostly focused on the selection problem of seed sources. In this paper, a scheme is proposed, which uses the metropolitan move relatively sta-ble buses as seeds to develop buffer allocation scheme to indirect offload cellular traffic based on the characteristics of urban multiple heterogeneous data. The better buffer scheme, the greater probabil-ity that users hit the data they want, then the more data to offload. Therefore, several greedy buffer schemes and a heuristic scheme are proposed. Finally, the advantages of heuristic scheme which is used in the case of a large amount of data is verified by plenty of experiments, and several important parameters that influence the efficiency of the data offloading are pointed out.

关 键 词：移动数据分流 车载网络 缓存机制 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]