A static message scheduling algorithm for reducing FlexRay network utilization

Currently, in order to meet customer requirements about safety and convenience, many electronics and software are used in automobiles. Because high amount of data from each electronics and software needs to be communicated fast and correctly, performance evaluation of in-vehicle network is necessary. FlexRay protocol that is suggested to guarantee exact operation of in-vehicle subsystem such as x-by-wire application has emerged as de-facto standard. However, there are only a few researches about response time analysis and timing performance verification. In this paper, to reduce FlexRay network utilization, a scheduling algorithm that long static message is assigned to dynamic segment is presented. We define system model for the algorithm and carry out performance evaluation using SAE benchmark data. Though the evaluation, we show that network utilization in all transmission speed is reduced, and also in lower transmission speed, it is reduced much more.