Improving TCP Performance over ATM-UBR with FED+ Scheme

YoonTze CHIN  Shiro HANDA  Fumihito SASAMORI  Shinjiro OSHITA  

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.6    pp.1514-1523
Publication Date: 2004/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Switching
TCP,  ATM,  UBR,  BMS,  FED,  FED+,  EPD,  P-RED,  fuzzy logic,  efficiency,  fairness,  robustness,  buffer requirement,  ease of tuning control parameters,  per VC accounting,  

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We had previously proposed a fuzzy logic-based buffer management scheme (BMS) called fuzzy early detection (FED), which was designed to improve transmission control protocol (TCP) performance over the unspecified bit rate (UBR) service of asynchronous transfer mode (ATM) networks. Since a weakness in FED was discovered later, we present a refined version of it named FED+ here. Maintaining the design architecture and the algorithm of FED, FED+ further adopts a specific per virtual connection accounting algorithm to achieve its design goals. The effects of TCP implementation, TCP maximum segment size, switch buffer size and network propagation delay on FED+ performance are studied through simulation. Its performance is then compared with those of pure early packet discard (EPD), P-random early detection (P-RED) and FED. Our evaluations show that FED+ is superior to the others if the issues of efficiency, fairness, robustness, buffer requirement and the ease of tuning control parameters of a BMS are considered collectively.