Abstract
The Random Early Detection (RED) algorithm controls the average queue size of Internet Protocol (IP) gateways by marking packets. Although RED provides efficient congestion avoidance, it cannot provide queuing delay control when the output bandwidth varies over time. In this paper, we introduce Delay RED (DRED), a variation of RED, which marks packets by monitoring the average queue delay. The mechanism embodies all the features of RED and additionally controls the average queue delay, even when the output service rate varies over time, such as with the Available Bit Rate (ABR) transfer capability. DRED is proposed as a complementary mechanism to RED and can be used for congestion avoidance and for applications requiring a better Quality of Service (QoS) in terms of delay. The performance of DRED has been verified on the OPNET simulation package. DRED proved to be adaptive to the ABR bandwidth fluctuations and offers the target QoS in terms of average delay.
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