Explicit Congestion Notification (ECN) and Active Queue Management (AQM) Schemes such as Random Early Detection (RED), Adaptive Random Early Detection (ARED) and BLUE queues have been proposed for TCP/IP networks to compensate network congestion. However, using ECN requires that ECN be supported by both TCP senders and receivers. This paper presents a novel AQM modification called Receiver-Window Modification (RWM). RWM can be used together with RED, ARED and BLUE queues, to provide congestion avoidance in packet switched networks, especially at ingress and gateway routers. RWM does not require modification to all end system TCP/IP stacks but can be solely implemented in routers. The RWM scheme helps in reducing the average queue sizes of RED, ARED, BLUE and even ARED-ECN, BLUE-ECN and RED-ECN queues.
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