Hu Miao, Zhong Zhangdui, Ni Minming, Baiocchi Andrea
State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China.
Department of Information Engineering, Electronics and Telecommunications (DIET), University of Roma Sapienza, Roma 00184, Italy.
Sensors (Basel). 2016 Nov 1;16(11):1834. doi: 10.3390/s16111834.
Large volume content dissemination is pursued by the growing number of high quality applications for Vehicular Ad hoc NETworks(VANETs), e.g., the live road surveillance service and the video-based overtaking assistant service. For the highly dynamical vehicular network topology, beacon-less routing protocols have been proven to be efficient in achieving a balance between the system performance and the control overhead. However, to the authors' best knowledge, the routing design for large volume content has not been well considered in the previous work, which will introduce new challenges, e.g., the enhanced connectivity requirement for a radio link. In this paper, a link Lifetime-aware Beacon-less Routing Protocol (LBRP) is designed for large volume content delivery in VANETs. Each vehicle makes the forwarding decision based on the message header information and its current state, including the speed and position information. A semi-Markov process analytical model is proposed to evaluate the expected delay in constructing one routing path for LBRP. Simulations show that the proposed LBRP scheme outperforms the traditional dissemination protocols in providing a low end-to-end delay. The analytical model is shown to exhibit a good match on the delay estimation with Monte Carlo simulations, as well.
越来越多适用于车载自组网（VANET）的高质量应用追求大容量内容传播，例如实时道路监控服务和基于视频的超车辅助服务。对于高度动态的车载网络拓扑，无信标路由协议已被证明在实现系统性能与控制开销之间的平衡方面是有效的。然而，据作者所知，以往的工作尚未充分考虑大容量内容的路由设计，这将带来新的挑战，例如对无线链路增强的连接性要求。本文针对VANET中的大容量内容传输设计了一种链路寿命感知无信标路由协议（LBRP）。每辆车根据消息头信息及其当前状态（包括速度和位置信息）做出转发决策。提出了一种半马尔可夫过程分析模型来评估为LBRP构建一条路由路径时的预期延迟。仿真结果表明，所提出的LBRP方案在提供低端到端延迟方面优于传统的传播协议。分析模型在延迟估计方面也与蒙特卡罗仿真表现出良好的匹配。
