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Challenge 2: Dynamic Range of Requirements Multitude of new proposals for congestion control algorithms Examples (transport): High-Speed TCP, Scalable TCP, Fast TCP and BIC/CUBIC Examples (mediation): XCP Issues Fairness Stability/Robustness wrt e.g. running conditions/environment, and link layer characteristics Note: still no common agreement in the IETF on which algorithm and protocol to choose Open issue: is it possible to define unified congestion control mechanism that operates reasonable well in the whole range of scenarios that exist in the Internet ? |