Technical Paper
An Evaluation of Latency Time by Simulation for Distributed Multiplex System
1991-02-01
910717
Currently both the SAE and ISO are working on the standardization of distributed multiplex transmission protocols, and the Japanese Society of Automotive Engineers (JSAE) is in the process of evaluating the performance and reliability of a number of communication protocols with a view to contributing to this work of standardization.(1) This paper summarizes that aspect of the JSAE's communication protocol evaluation program that concerns response. CSMA /CD with non-destructive arbitration systems that are used in motor vehicles resemble ordinary CSMA/CD systems in that transmission delay times vary in accordance with traffic. Thus when there is a stringent need for response, it is essential to make judgments on the basis of the probability in terms of delay time. It is, however, impossible to determine delay probabilities experimentally due to the problem of the number of test runs, and this creates a need for methods using simulation and analysis.