Probabilistic delay model of dynamic message frame in FlexRay Protocol

Since the safety and multimedia-related functions of automobile are getting increased and complex, In-vehicle network has become important. Even though FlexRay has emerged as the de-facto standard for the network, the message delay analysis problem has not been solved yet. In this paper, we propose the probabilistic delay model of message transmission in the FlexRay dynamic segment considering the variable length of messages that share identical Frame ID. Based on the model, we analyze frame delay probability as performance metric, which can be used during the design phase of FlexRay network, and finally, show that previous model only considering fixed frame length causes pessimistic probability compared to the proposed model.