IP architecture of a MOST150 based infotainment system: Page 5 of 6

October 12, 2012 // By Alexander Leonhardi, Uwe Walter, Rico Hauke, Marco Maniscalco
IP architecture of a MOST150 based infotainment system
Internet access has become an essential feature of modern vehicle infotainment systems. Today, it is the prerequisite to provide the user with up-to-date online information and services. In the case of a high-end distributed infotainment system - which consists of, for example, a head unit (HU), a rear-seat entertainment unit and a TV tuner - the communication is largely based on the Internet Protocol (IP), whose mechanisms have to be coordinated accordingly.

TCP, this is a good rate in comparison with other network technologies such as Ethernet. For UDP, the numbers are slightly lower. For bidirectional traffic, we achieved a similar combined bandwidth for the traffic from the HU to the rear-seat entertainment unit and vice versa. While for UDP the bandwidth in both directions is almost similar, we observed some variations in the bandwidth for TCP, which we are currently investigating.

5. Conclusion and Future Work

In this paper, we described the IP architecture of the next generation of Daimler’s vehicle infotainment systems. The IP architecture provides the basic mechanisms for applications on the infotainment system to access information and services on the Internet. Based on the Ethernet channel of MOST150, all devices in a MOST network are provided with access to the Internet. The mechanisms of the IP architecture provide the flexibility to configure the connections according to the requirements of the IP access or security considerations.

As next steps, the IP architecture of the infotainment system will be integrated more tightly with the IP mechanisms of the user’s mobile devices. To this end, the appropriate standards also on the higher layers need to be supported (see, e.g., [4], [5]). In particular, the use case of of seamlessly integrated mobile consumer devices over WLAN is currently becoming more and more relevant and will have to be supported by vehicle infotainment systems.


[1] MOST Cooperation: MOST Specification, Rev. 3.0E2, 07/2010,
URL: https://www.mostcooperation.com.

[2] Internet Engineering Task Force (IETF): Request for Comments (RFC) Pages, Web-Site,
URL: https://www.ietf.org/rfc.html.

[3] A. Leonhardi, S. Wachter, M. Bösinger, T. Pech: MOST150's New Features in a Series Project in Elektronik Automotive, Special issue MOST , pp. 54-56, April 2011.

[4] A. Leonhardi, T. Gschwandtner, R. Hauke, M. Stümpfle: Using UPnP in a MOST Environment, in Elektronik Automotive, Special issue MOST , pp. 38-40, March 2010.

[5] Universal Plug and Play Forum: UPnP

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