This paper presents TCP Rate Control, a new technique for transparently augmenting end-to-end TCP performance by controlling the sending rate of a TCP source. The `rate' of a TCP source is determined by its window size, the round trip time and the rate of acknowledgments (or acks). TCP rate control controls these aspects by modifying the ack number and receiver window fields in acknowledgments and by modulating the acknowledgment rate.
From a performance viewpoint a key benefit of TCP rate control is to avoid adverse performance effects due to packet losses such as reduced goodput due to retransmission and timeout delays, and unfairness or large spread in per-user goodputs. Further, TCP rate control can positively affect performance even if the bottleneck is non-local and even if the end-host TCP implementations are non-conforming. We demonstrate these aspects through a comparative study with RED and TCP-ECN, and discuss deployment issues.
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