Traffic Offloading for Online Video Service in Vehicular Networks: A Cooperative Approach

Traffic Offloading for Online Video Service in Vehicular Networks: A Cooperative Approach
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车载网络中在线视频服务的流量分流:一种合作方法

DOI:
10.1109/tvt.2018.2837024
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发表时间:
2018-05
影响因子:
6.8
通讯作者:
Zhuang Weihua
Zhuang Weihua
中科院分区:
计算机科学2区
文献类型:
--
作者:
Sun Yanglong;Xu Le;Tang Yuliang;Zhuang Weihua

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随着人们习惯于以视频的形式获取信息,在线视频服务变得流行起来。虽然家庭用户可以很容易地将各种内容检索到他们的笔记本电脑或智能手机上,但车载用户受到与路边设备(RSU)断断续续连接的限制。此外,随着蜂窝基础设施的负载急剧增加,可以设想利用RSU和车载继电器来卸载蜂窝网络。本文提出了一种由车载自组织网络和蜂窝网络组成的异质车载网络中的协同下载机制。在这种机制中,RSU充当交通管理员,从互联网获取适当的数据,然后以接近最佳的方式分发给车辆。具体地,基于车辆机动性预测和节点间吞吐量估计,构建存储时间聚集图用于规划传输方案;然后,设计了一种迭代贪婪驱动算法来求解具有多项式计算时间复杂度的次优解。仿真结果表明,与最大吞吐量和最小延迟协作下载(MMCD)算法相比,该方法在减载率方面比最大吞吐量和最小延迟协作下载(MMCD)算法的性能高5.2 5%。
Online video service becomes prevalent nowadays, as people are accustomed to getting information in the form of videos. While home users can easily retrieve all kinds of contents onto their laptops or smartphones, vehicular users are constrained by intermittent connectivity to roadside units (RSUs). Besides, as the load of cellular infrastructure increases dramatically, it is envisioned that the cellular network can be offloaded by utilizing RSUs and vehicular relays. In this paper, we propose a cooperative downloading mechanism in heterogeneous vehicular networks that comprises vehicular ad hoc network and cellular network. In this mechanism, RSUs act as traffic managers to fetch proper data from the Internet and then distribute to vehicles in an approximately optimal manner. Specifically, based on vehicular mobility prediction and internode throughput estimation, a storage time aggregated graph is constructed for planning transmission scheme; then, an iterative greedy-driven algorithm is designed for a suboptimal solution, which has polynomial computational time complexity. Compared with max-throughput and min-delay cooperative downloading (MMCD), simulation results show that our approach outperforms MMCD by $5\%\text{$-$}25\%$ with respect to offload fraction.
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