MOST150's new features in a series project

May 03, 2011 // By Alexander Leonhardi, Stefan Wachter, Marcus Bösinger, Torsten Pech
The MOST150 infotainment bus system is about to take the place of earlier MOST systems. With its high bandwidth which can be utilized up to almost 100 percent, MOST150 is a viable platform for advanced next-gen infotainment systems. Daimler already has gathered experience with the new bus.

1. Introduction

The MOST Bus is the de-facto standard for connecting infotainment systems in high-end vehicles. In Daimler AG vehicles, MOST25 with a speed grade of 25 Mbit/s has now been used for ten years. However, with the bandwidth of MOST25 almost fully occupied in current systems and with new system requirements for the next generation of infotainment systems, it was necessary to switch to a network with more bandwidth. Therefore, Daimler AG has decided to build its next generation of infotainment systems based on MOST150, as defined by the MOST Specification 3.0 [3].

The bandwidth provided by MOST150 enables us to realize new features, such as access to Internet services, as well as increased requirements for connectivity to consumer devices. In addition, we have begun to stream video over MOST150, replacing separate dedicated video links. With the bandwidth provided by MOST150, it is possible to create a system where the available audio and video sources can be accessed independently from different seats.

In this paper we will describe our experiences with the networking and architectural aspects of the on-going development process. We will sketch requirements and the system architecture of Daimler's infotainment in the next section. The focus of this paper will be on the new features of MOST150 and the MOST Specification 3.0 and how they have been employed in the design of the system. Specifically, in Section 3 we will discuss the audio and video architecture required for a multi-seat system and in Section 4 the use of the new MOST Ethernet channel. Finally, Section 5 concludes the paper and describes our plans for further evolution of the system.

2. Requirements of the Next Generation Infotainment System

In this section, we will first describe the architecture of Daimler's current infotainment systems. Starting from this we will then discuss the requirements for the next generation of infotainment systems. The focus of the discussion will be on the networking

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