基于静态段参数优化的FlexRay网络可靠性研究

发布时间：2018-01-08 03:06

本文关键词：基于静态段参数优化的FlexRay网络可靠性研究　出处：《苏州大学》2016年硕士论文　论文类型：学位论文

【摘要】：为了满足人们对于安全、舒适、经济环保等方面日益增长的需求,汽车正朝着电子化、网络化和智能化方向快速发展。新一代汽车电子控制系统具有更复杂的网络结构、更大的通信数据量、更高的可靠性要求、更快的功能扩展速度,传统车载网络难以满足。Flex Ray作为下一代车载网络协议,其功能安全性显得至关重要。本文以Flex Ray网络可靠性为研究切入点,主要工作如下:分析了Flex Ray网络可靠性问题,在应用层建立主动重传机制,提升网络可靠性。分别从静态段参数优化和消息重传优化两个角度考虑,通过优化网络带宽利用率和时隙消耗数目,减少消息重传带宽消耗,提升消息重传的调度成功率,从而提高Flex Ray网络的可靠性。静态段参数优化以网络带宽利用率为约束,提出基于信号优先级的封装方法,有效减少无效带宽损耗。在信号封装基础上,采用时隙复用方法,优化消息标识(FID)分配,有效减少时隙消耗数目。在网络建立消息重传机制前,通过静态段优化参数以达到优化带宽利用率的目的。因此,消息重传的带宽消耗降低。定义消息可靠性贡献率作为消息重传选择标准,该标准兼顾重传可靠性贡献与重传带宽消耗两个指标。依据可靠性贡献率,建立消息重传序列,提高消息重传对可靠性提升的效率。同时,建立参考消息重传序列,有效减少消息重传调度失败次数。消息重传序列调度,采用消息复用机制,优化重传消息标识分配。计算结果表明,此消息重传方案能够有效减少可靠性提升消耗的带宽资源和时隙数目,并降低消息重传序列调度失败次数,从而提高Flex Ray网络的可靠性。
[Abstract]:In order to meet people for the safety, comfort, economy and environmental protection and other aspects of the growing demand, the car is facing the rapid development of electronic, network and intelligent direction. A new generation of automotive electronic control system with network structure more complex, a greater amount of communication data, require higher reliability, faster expansion function the vehicle speed, the traditional network is difficult to meet the.Flex Ray as the network protocol of the next generation, the function of safety is very important. In this paper, the reliability of Flex Ray network as the research starting point, the main work is as follows: the analysis of the reliability of Ray network Flex, the initiative to establish the retransmission mechanism in application layer, improve network reliability. Separately from the optimization parameters the static segment and message retransmission optimization two point of view, through the optimization of the network bandwidth utilization and reduce the consumption of time slot number, message retransmission bandwidth consumption, improve message retransmission scheduling The success rate, so as to improve the reliability of Flex Ray network. The static parameters to optimize the bandwidth utilization of the network constraints proposed package method based on priority signal, effectively reduce the bandwidth loss. In the invalid signal package based on the time slot multiplexing method, optimize the message identifier (FID) distribution, reduce the number of time slots in consumption. Establish a network message retransmission mechanism, through the static segment optimization parameters to achieve optimal bandwidth utilization. Therefore, the message retransmission bandwidth consumption is reduced. The definition of message reliability contribution rate as the message retransmission selection standard, the standard balance of two indicators of retransmission reliability contribution and retransmission bandwidth consumption. Based on the reliability of the contribution rate establish, message retransmission sequence, improve the efficiency of message retransmission reliability. At the same time, the establishment of reference message retransmission sequence, effectively reduce the message retransmission scheduling failure message number. Retransmission scheduling sequence, using message multiplexing mechanism, optimize the retransmission of the message identifier assignment. The calculation results show that this message retransmission scheme can effectively reduce the reliability and enhance the bandwidth consumption and reduce the number of slots, the number of failure message retransmission scheduling sequence, so as to improve the reliability of Flex Ray network.

【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.6

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