MOST in Driver Assistance : Page 3 of 5

February 07, 2013 //By Wolfgang Bott, MOST Cooperation
MOST in Driver Assistance
This article gives evidence supporting the need for seamless integration of infotainment and driver assistance. Both hard real-time and high bandwidth requirements must be met. A multi-channel network approach with inherent synchronicity will be the first choice. If then additional advantages such as maturity, cost efficiency and flexible topology come along with an appropriate safety integrity level, MOST is proven to fit best from a system solution perspective.
(or even 105°C).

To this purpose, the MOST system concept is based on inherent synchronicity on the physical layer level. Clear distinction between transfer jitter (relevant on the system level) and alignment jitter (only relevant on the single link level) leads to a robust system design. The specification limits are testable and can be checked during compliance verification.

Flexible Topology

The flexibility of the MOST network has already been proven: differing topologies such as star, chain and tree are equally possible, as are diverse physical layers: polymer optical fiber (POF), coax based electric physical layers as well as shielded or unshielded, twisted copper cables (STP/UTP). The MOST150 Specification Rev. 1.0 for the electric physical layer for MOST150 via coax cable has recently been released. This standard extends the existing optical physical layer for MOST150 in the infotainment domain and opens up new possibilities into vehicle domains like driver assistance, as it allows bi-directional communication and power supply across a single cable. Both physical layers are fully compatible.

High Bandwidth

MOST is designed as a synchronous network system solution with high bandwidth at nearly no overhead for administrative communication.

The management of synchronous and isochronous streaming connections allows for an appropriate allocation of resources and thus provides access to quality of service (QoS) communication. Concerning the isochronous channel, QoS IP communication is provided as well.

The bandwidth requirements will still be increasing. In addition to USB 3.0 and display link application in driver assistance there will be a need for uncompressed video transmission and sensor fusion.

MOST is committed to a clear definition of a roadmap. MOST Technology is open for future extensions, e.g. considering high bandwidth. The next generation of MOST will enhance the bandwidth into the Gigabit range. This seems to be promising for both optical link and coax links, which are both used today in telecom standards, whereas today´s UTP approach seems to stay in a niche.


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