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Advisor(s)
Abstract(s)
Ethernet is increasingly being considered as the
solution to high bandwidth requirements in the next generation of
timing critical applications that make their way in cars, planes
or smart factories to mention a few examples. Until recently,
ethernet frames used to be transmitted exclusively in a nonpreemptive
manner. That is, once a frame starts transmitting on
a switch output port, its transmission cannot be interrupted by
any other frame until completion. This constraint may cause
time critical frames to be blocked for long periods of time
because of the transmission of non-critical frames. The IEEE
802.3br standard addressed this issue by introducing a one-level
ethernet frame preemption paradigm. In this approach, frames
transmitted through a switch output port are classified as express
frames or preemptable frames, depending on their priority levels.
Express frames can preempt preemptable frames and two frames
belonging to the same class cannot preempt each other. While this
partially solves the problem for express frames, all preemptable
frames can still suffer blocking irrespective of their priority level.
In this work, we investigate the feasibility and advantages of
multi-level preemptions in time-sensitive ethernet networks.