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End-to-end congestion control cannot avoid latency spikes (2022)
What are the fundamental limits of end-to-end congestion control in 5G networks?
During the workshop, a common misunderstanding (even among experts in the field) became apparent — that end-to-end congestion control can deliver reliable low latency if we just tune it correctly. Notice that the queue is already formed by the time the sender knows about the congestion.In the paper, we model the best possible case for an end-to-end congestion controller and work out how much latency we’d see on the bottleneck link if its capacity is suddenly reduced. The mathematics is simple, and we can compute the peak latency using the factor of capacity change (1/r) and how much time it takes to send a signal from the point of congestion to the traffic source (d).
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