A Simulation Study of TCP Performance over ABR and UBR Services in ATM LANs

Hongqing LI  Kai-Yeung SIU  Hong-Yi TZENG  Chinatsu IKEDA  Hiroshi SUZUKI  

IEICE TRANSACTIONS on Communications   Vol.E79-B    No.5    pp.658-667
Publication Date: 1996/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High Speed Local Area Network)
ATM networks,  ABR service,  UBR service,  TCP,  congestion control,  Early Packet Discard (EPD),  

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Both available bit rate (ABR) service and unspecified bit rate (UBR) service with early packet discard (EPD) schemes have been considered for supporting data applications in ATM networks. Since transmission control protocol (TCP) is perhaps the most widely used transport layer protocol in existing data networks, the performance of TCP over ATM using ABR service and UBR service with EPD schemes is of great interest to ATM equipment vendors and service providers. In this paper, we present a simulation study of this interesting issue in a LAN environment using some benchmark network configurations proposed in the ATM Forum. Our simulation results show the following: (1) With UBR service and EPD schemes, TCP suffers significant performance degradation in terms of fairness and requires relatively large switch buffer even with a small number of active virtual connections over a LAN configuration, and (2) for the same set of network configurations and with ABR service using explicit rate feedback schemes, TCP achieves good performance in terms of fairness and link utilization, and requires relatively small switch buffer.