In this paper we extend Multi-level ECN, a new TCP congestion scheme, which we have proposed previously. The Multi-level Explicit Congestion Notification (MECN) algorithm allows network operators to achieve high throughput with corresponding low delays. But MECN average queue, is sensitive to its parameter settings and its the level of congestion, hence no guarantees can be given about delay. Delay being a major component of the quality of service network operators would naturally like to have a rough estimate of the average delays in their congested routers. To achieve a predictable average delays with MECN would require constant tuning of the parameters to adjust to current traffic conditions. The goal of this paper is to solve the parameter tuning problem of the MECN. We compare the performance of the Adaptive MECN system with the Adaptive RED system using simulations,using ns-2 simulator. Based on simulations we find that Adaptive MECN performs better than Adaptive RED.
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