MOST and AVB: Two Candidates for Next-Gen Automotive Infotainment Networks: Page 5 of 6

June 05, 2013 //By Günter Dannhäuser, Dr. Walter Franz, Prof. Dr. Wolfgang Rosenstiel
MOST and AVB: Two Candidates for Next-Gen Automotive Infotainment Networks
MOST150 is the prevalent networking technology for the coming years in automotive infotainment. Although MOST150 is only at the beginning of mass deployment, pre-development of the next generation has already started. With IEEE802.1 AVB, another concept has entered the discussion about the successor to MOST150. AVB needs to be considered, appropriately evaluated and compared with current and evolving MOST concepts.
evaluation platform. Standard PCs with NICs of both network domains (blue/red points). Note: MOST domain topology depicted as ring just for illustration purposes.

We aim to evaluate the full scope of AVB standards and will include further AVB building blocks as soon as they are available. Based on the results of these investigations, we then plan to narrow down what will apply to automotive profiles of AVB and interoperation possibilities with other systems. A first step is to create exemplary implementations of scenarios that are typical for automotive infotainment, though yet not common in the consumer market. One scenario for AVB evaluation is application-level synchronization of multiple media streams on different sinks, including CE devices (Figure 4). With AVB providing synchronization on a network level, we want to investigate what additional measures have to be implemented to achieve application-level synchronization and which preconditions have to be met.

Figure 4: Use case A/V-streaming from a source in the car-domain (head unit, tuner, Blu-ray player, etc.) to two tablet computers with user-domain media player, lip-sync with each other and cabin speakers.

As a second step, mapping of a present MOST150 system to AVB on the evaluation system will provide hands-on experience with AVB and allow direct comparison to the functionality and performance that MOST150 delivers. Driving the evaluation system to its limit, we will analyze its behavior regarding factors such as synchronization accuracy or impact on best effort traffic. Additionally, this will allow us to identify optimization possibilities, for example by using static stream classification, reservation or traffic shaping.

We also intend to use the evaluation system for research on how to integrate wireless CE devices. Applicability of AVB concepts for WiFi is therefore another topic we will investigate, though “WiFi AVB” is anything but definite so far.

The main focus of our investigation will be the interoperation of MOST150 and Ethernet/AVB. Synchronization of time and clocks is the basic property of

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