Adaptive congestion control of DSRC vehicle networks for collaborative road safety applications
Adaptive congestion control of DSRC vehicle networks for collaborative road safety applications
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DOI：
10.1109/lcn.2011.6115571
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
Wenyang Guan;Jianhua He;Lin Bai;Zuoyin Tang
中科院分区：
文献类型：
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作者：
Wenyang Guan;Jianhua He;Lin Bai;Zuoyin Tang
拥塞控制对于通过专用短程通信 (DSRC) 车辆网络为道路安全应用提供服务质量 (QoS) 至关重要。在本文中，我们提出了一种道路交叉口 DSRC 车辆网络拥塞控制方法，旨在为高优先级紧急安全应用提供高可用性和低延迟的通道，同时最大限度地提高低优先级常规安全应用的通道利用率。在该方法中，使用基于离线仿真的方法来找出给定数量的配备 DSRC 无线电的车辆的消息速率和 MAC 层退避指数 (BE) 的最佳可能配置。然后，路边接入点 (AP) 在线使用确定的最佳配置进行系统操作。仿真结果表明，在不同车辆数量下，该自适应方法明显优于固定控制方法。还研究了网络中车辆数量的估计误差对系统级性能的影响。
Congestion control is critical for the provisioning of quality of services (QoS) over dedicated short range communications (DSRC) vehicle networks for road safety applications. In this paper we propose a congestion control method for DSRC vehicle networks at road intersection, with the aims of providing high availability and low latency channels for high priority emergency safety applications while maximizing channel utilization for low priority routine safety applications. In this method a offline simulation based approach is used to find out the best possible configurations of message rate and MAC layer backoff exponent (BE) for a given number of vehicles equipped with DSRC radios. The identified best configurations are then used online by an roadside access point (AP) for system operation. Simulation results demonstrated that this adaptive method significantly outperforms the fixed control method under varying number of vehicles. The impact of estimation error on the number of vehicles in the network on system level performance is also investigated.