CAN总线的CSMA/CA通信过程的DSPN建模与性能分析

DSPN modeling and performance analysis of CSMA/CA communication for CAN

针对采用CSMA/CA协议的CAN总线通信过程进行建模及性能分析,应用确定与随机Petri网DSPN,对每个节点进行确切的描述,构成一个单网段复合模型,并在此基础上构建一个简化的紧缩模型。仿真实验验证了紧缩模型能够很好地逼近复合模型,且求解时间短,可以通过紧缩模型进行CAN总线系统吞吐量、平均信息时延、通信冲突率和网络利用率的定量和定性分析。

DSPN （deterministic and stochastic Petri net） modeling and performance analysis of CSMA/CA for CAN is presented in detail. Firstly, single node model of the communication behavior of the CSMA/CA protocol is accurately described using DSPN. From the single node model, a complex multiple node model for the network segment is constructed. Based on this a compact model is constructed. The simulation result proves that the compact model perfectly approaches the complex multiple node model, and the calculation time is substantially reduced. The quantitative and qualitative analysis for the performances, such as throughout, average message delay, collision probability and network utilization can be carried out using the compact DSPN model, which is very useful for engineers and researchers.