Right now we consider AQM and Fair Queuing to be a solved problem, in terms of designing and implementing algorithms. The open problem in this area is DEPLOYMENT of these known solutions in the field. This is not strictly a technical problem, but a political and economic one.
There are two related areas which we are still working on at a technical level: Comprehensive Queue Management (CQM) which adds traffic classification to the existing combination of AQM and FQ, and adapting AQM/FQ/CQM to Wi-Fi networks, which have some unique characteristics which require special consideration. However, making progress in these two areas requires the people involved to have understood the state of the art at a deep level before they can usefully contribute. It also requires work with real traffic and environments, or at least simulators considerably more advanced than ns2. - Jonathan Morton
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