RED-priority cell discarding method for improving TCP performance in ATM networks

The poor throughput TCP achieves in ATM networks can be mainly attributed to the timeout problem. Multiple packet losses make the timeout problem. Multiple packet losses happen in the long time wasted passing through a buffer, because of a loss of several segments during the same sending window. In order to solve the long time wasted passing through buffer, random early detection (RED) is used to keep the average queue size as low as possible while allowing occasional bursts. Also, we propose a new cell discarding policy called RED-PCD (priority cell discarding). A damaged VC has a higher priority over non-damaged VCs in the sense that it is subject to the upper max/sub th/ of the queue for some recovery period. RED-PCD spaces segment losses far from one another, reducing the multiple packet losses.