摘要
在车载自组网中,道路安全相关应用地位日益突出。根据安全消息的紧迫程度对其优先级进行划分。提出了基于时空的动态优先级调度策略,通过建立时空相关函数表示不同优先级大小,优先级随着消息分发的时间和距离的增长而减小。同时,将紧急报警消息的传输限制在一定的时间域和空间域。通过仿真实验,结果证明基于时空的动态优先级调度策略可有效地提升网络性能:与采用固定优先级最大延迟门限的方法相比,当节点密度高时该算法可以很好地减少网络负载;当节点密度低时可以更好地扩大传输范围。
Safety application is very important in vehicular ad-hoc networks. Safety-related message priority is classed based on message urgency. In this paper, a spatiotemporal-based dynamic priority scheduling scheme is proposed. A spatial-temporal relevance function is introduced to represent the priority, which decreases as distance and duration increase in the message dissemination. Meanwhile, the distribution of a urgency message is limited to a bound duration and spatial area. Analyses and simulations show that the spatiotemporal-based dynamic priority scheduling is of a significant performance improvement in decreasing the network load in high density and increasing the transmission distance in the low density over the meth- od using the fixed priority with the maximum delay threshold.
出处
《空军工程大学学报（自然科学版）》
CSCD
北大核心
2013年第2期71-75,共5页
Journal of Air Force Engineering University(Natural Science Edition)
基金
航空科学基金资助项目(20095596014)
陕西省自然科学基金资助项目(2009JM8001-4)
关键词
车载自组网
安全消息
动态优先级
调度
vehicular Ad hoc network safety message dynamic priority scheduling
