As a result of initiatives for new ITS services and advances in the multimedia compatibility of in-vehicle equipment in recent years, the SAE and ERTICO have launched studies to create an onboard ITS Data Bus (IDB) compatible with these developments. Similar studies have also been undertaken in Japan by the Association of Electronic Technology for Automobile Traffic and Driving (JSK). With the aim of promoting standardisation of the physical layer of the IDB for multimedia (IDB-M), the present research examined the performance required of the physical layer, focusing special attention on the necessary data transmission capacity. This research drew upon the accumulated results of previous studies conducted by JSK concerning the onboard ITS system architecture (SA). As an initial step, a study was made of the future introduction and penetration of ITS services and the types of equipment that may be connected to the IDB-M. On that basis, estimates were made of the data transmission capacity that will be needed in certain years in the future. The present status of physical layer technologies of LANs (Local Area Networks) intended for automotive, consumer electronics and office equipment applications was then surveyed along with projections for future technological trends. Installation restrictions stemming from the vehicle environment were also investigated, and the feasibility of achieving the desired IDB-M physical layer in specific time frames in the future was examined. The results of this research made clear the directions that should be taken to address various technological issues concerning the physical layer. For the covering abstract see ITRD E114174.
Abstract