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Background and Abstract.
The Physical Layer Collision Avoidance (PLCA) layer developed as a part of 802.3cg provides a fair and equal access over shared medium while providing bounded maximum access latency. This method has been widely adopted in automotive Ethernet networks onto production vehicles. The maximum access latency is not sufficiently bounded in providing deterministic latency for many of the controls applications.
PLCA access method provides fair and equal access. This consensus building presentation is to explore adding differentiated services enhancements to PLCA such that the maximum access latency is made to be deterministic, such that configured controls application loop may directly benefit from the determinism. In this context, control loop applications have Sense --> Compute --> Actuate --> <repeat> such as power train, suspension, power assisted lift gate, etc.
This need has been identified in prior projects in the past. We believe there are more than one schemes that may address this need.
This presentation shows one such solution that may serve as a technical feasibility of providing low deterministic latency via differentiated services while preserving the fairness provided by PLCA. If sufficient consensus is reached on the need and feasibility, the intention is to move to a Call-For-Interest (CFI) at the November plenary.
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