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Challenge 1: Router Support Performance and robustness Router support can help to improve performance and fairness Tradeoff: high link utilizations and fair resource sharing robust and conservative in particular during congestion phases Additional complexity and more control loops => careful design of the algorithms to ensure stability and avoid oscillations Precision and delay in feedback information Estimation errors in measured parameters such as RTT Open issues: How much can routers theoretically improve performance in the complete range of communication scenarios that exists in the Internet? Is it possible to design robust mechanisms that offer significant benefits without additional risks? |