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Challenge 1: Router Support Routers involvement in congestion control Implicitly: queue management & scheduling strategies to support end-to-end congestion control Finding systematic rules for setting optimal and robust set of AQM parameter values (affecting performance) is a non-trivial problem Examples: RED (and variants), REM, PI, AVQ, etc. Explicitly: notification mechanisms towards endpoints for more precise decisions to better prevent packet loss and improve fairness Examples: ECN [RFC3168], eXplicit Control Protocol (XCP) [Katabi02] [Falk07] |