Both MOSTnG and AVB can be considered technologically feasible concepts, sufficient to meet the demands of next generation infotainment networks. MOST has a big bonus in confidence and maturity and is better adapted for automotive use. Development of MOSTnG could further on be directly influenced and tailored via the MOST Cooperation, in line with OEM demands, quickly and pragmatically.
There is a great deal of work to do for automotive use of AVB. Although its standardization enables flexible usage that results in a prolific supplier and market situation, the standardization processes are challenging, with lots of voices from non-automotive interest groups in manifold international committees and working groups.
With these points in mind, at the moment it is very difficult to identify clear decisive factors on a technical level for one approach or the other. Regarding market size and heterogeneity on each side, especially in the long term, AVB is an option that needs to be seriously considered, at least. As for automotive usage, primarily in the infotainment domain, AVB needs to be evaluated and its performance needs to be compared to the MOST system.
Evaluating AVB and Interoperability
For these reasons, we decided to build a system to evaluate both technologies on one single platform. We combine MOST and AVB networking domains by integrating multiple MOST and AVB adapters in standard PCs (Figure 3). The idea is to make use of a unified hardware, operating system and system clock environment to be able to correlate timestamps for both networking domains as a base method for evaluation on higher and application level. This will allow us to further explore interoperability scenarios between MOST and AVB, taking into account that Ethernet systems may be deployed in other time-sensitive automotive domains interacting with MOST Technology deployed in the infotainment domain.
Figure 3: Overview of the MOST and AVB