Dynamic resource management
Journal CAN Newsletter, No. 2/2000, pages 48-50, 6 2000 ,
Abstract
Communication between intelligent sensors, actuators and controller
components imposes stringent requirements on timeliness and predictability.
Thus field-bus standards such as PROFIBUS, EIB, or CAN provide mechanisms
for deterministic and priority-driven media access. As timing behaviour
strongly depends on worst-case traffic load, a configuration step normally
precedes field-bus installation where the communicating entities as well
as the generated traffic patterns are identified and priorities are
assigned accordingly.
It would be a considerable improvement to automatically perform resource
management (such as admission control and priority assignment) during
system operation. This may be realised as a kind of "plug and play"
functionality for timeliness guarantees.
Due to increasing QoS demands of modem applications, local and wide area
networks have to meet similar requirements, which led to the development
of so-called QoS architectures. We argue that many of these concepts are
also adequate to the field-bus domain and, in particular, propose a QoS
architecture for CAN.
