Optimizing the Control Channel Interval of the DSRC for Vehicular Safety Applications
Optimizing the Control Channel Interval of the DSRC for Vehicular Safety Applications
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DOI：
10.1109/tvt.2015.2440994
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发表时间：
2016-05-01
影响因子：
6.8
通讯作者：
Zhao, Lian
中科院分区：
文献类型：
--
作者：
Hafeez, Khalid Abdel;Anpalagan, Alagan;Zhao, Lian
专用短距离通信（DSRC）技术已被IEEE社区采用，使安全和非安全应用的车辆自组织网络。为了更好地服务于这两类应用，DSRC标准将带宽分为七个通道。其中一个通道称为控制通道（CCH），用于安全应用，另外六个通道称为服务通道，用于非安全应用。DSRC标准规定了一种信道切换方案，允许车辆在这两类应用之间交替。该标准还建议车辆应每100 ms（称为同步间隔（SI））访问一次CCH，以发送和接收其状态消息。非常希望这些状态消息被可靠地并且在可接受的延迟范围内传递到相邻车辆。显然，增加CCH与SI的时间份额将增加安全应用的可靠性。在本文中，我们提出了两种算法来优化控制信道间隔（CCI）的长度，使非安全应用程序有一个公平的份额SI间隔。一种算法，这是所谓的最佳信道接入，提出了允许车辆访问信道与派生的最佳概率，使成功的传输速率最大化。第二种算法，这是所谓的移动性和拓扑感知算法，是一种自适应方案，提出改变DSRC参数的基础上的道路和网络条件，允许安全和非安全应用程序共存的DSRC。车辆将以分布式方式执行两种算法，以在选定的CCI间隔内实现高成功率。仿真结果表明，使用这两种新的算法保持CCI低于一半的SI在所有情况下，同时保持较高的成功率的安全消息。这将使非安全应用有机会在SI间隔的后半部分工作，而不会危及关键的安全应用。
Dedicated short-range communication (DSRC) technology has been adopted by the IEEE community to enable safety and nonsafety applications for vehicular ad hoc networks. To better serve these two classes of applications, the DSRC standard divides the bandwidth into seven channels. One channel, which is called the control channel (CCH), serves safety applications, and the other six channels, which are called service channels, serve nonsafety applications. The DSRC standard specifies a channel-switching scheme to allow vehicles to alternate between these two classes of applications. The standard also recommends that vehicles should visit the CCH every 100 ms, which is called the synchronization interval (SI), to send and receive their status messages. It is highly desirable that these status messages be delivered to the neighboring vehicles reliably and within an acceptable delay bound. It is obvious that increasing the time share of the CCH from the SI will increase the reliability of safety applications. In this paper, we propose two algorithms to optimize the length of the control channel interval (CCI) such that nonsafety applications have a fair share of the SI interval. One algorithm, which is called optimal channel access, is proposed to allow vehicles to access the channel with a derived optimal probability such that the successful transmission rate is maximized. The second algorithm, which is called the mobility-and topology-aware algorithm, is an adaptive scheme proposed to change the DSRC parameters based on the road and network conditions to allow the coexistence of safety and nonsafety applications on the DSRC. Vehicles will execute both algorithms in a distributed manner to achieve a high success rate within the selected CCI interval. The simulation results show that using the two new algorithms keeps the CCI below half of the SI in all scenarios while maintaining a high success rate for safety messages. This will give nonsafety applications the opportunity to work in the second half of the SI interval without jeopardizing the critical safety applications.