Abstract
We have proposed a fuzzy logic-based buffer management scheme (BMS) called fuzzy early detection (FED) to improve transmission control protocol (TCP) performance over the unspecified bit rate service of asynchronous transfer mode networks. FED uses early congestion detection and selective packet discard strategies to achieve its design goals, and adopts early packet discard (EPD) to prevent frequent buffer overflows. Its performance is compared with those of pure EPD and P-random early detection (P-RED) through various simulations. The effects of TCP implementation, TCP maximum segment size, switch buffer size and network propagation delay on their performances are studied. If the issues of efficiency, fairness, robustness, ease of tuning parameters, and buffer requirement of a BMS are considered collectively, we conclude that FED is better than the others.
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