MOST150 enables New Features in the Infotainment System

June 25, 2015 // By Wolfgang Bott, MOSTCO
MOST (Media Oriented System Transport) Technology has been evolving for many years and now hit more than 170 car models on the road worldwide. The third generation based on MOST150, with a bandwidth of 150 Mbit/s, is successfully on the road. Driven by the OEMs, the automotive series developers have designed a multi-channel network with inherent synchronicity, which provides determinism and low latency. Many of the challenges in the automotive environment have been solved during the past 15 years and made the MOST standard robust and mature.

Meanwhile, the work is continually going on and new features will be defined in the coming MOST Specification Rev. 3.1. One of these features is a multiport network interface controller that is able to allocate the true, full bandwidth of up to 150 Mbit/s in up to eight branches. This enables a streaming bandwidth of up to 1.2 Gbit/s and allows a variety of topologies. In addition, a remote network interface controller has been defined in a MOST network. It works autonomously without the need for a host controller, thus enabling the concentration of software in a centralized unit and tremendously simplifying the complexity of the "remote" nodes. Beyond, this article will show the evolution of the application framework based on new data types and a new xml schema based exchange format. Adding these features, MOST Technology turns out to be resilient and future-proof.

Multi-channel Approach

MOST is a multi-channel network that allows the parallel usage of all services for control data, streaming data and packet data through one network (figure 1). These services are easily synchronized, if necessary, in a highly deterministic way. Based on synchronous MOST frames, the transmission of both native streaming data and packet-oriented data, for example packetized elementary streams, is supported. The third generation of the MOST Specification [1], [2] introduces MOST with 150 Mbit/s. It is supported for both Plastic Optical Fiber (POF) and Coax. MOST150 enables IP data communication, thus providing an automotive-ready Ethernet channel according to IEEE 802.3 with freely configurable bandwidth from 0 to nearly 150 Mbit/s. MOST is open to a broad variety of IP protocol based applications, including seamless integration of wireless mobile devices or car-to-car and car-to-infrastructure communication.

Fig. 1: MOST Data

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