The FB Mechanism for TCP over UBR in Subnet ATM Models

Woo-June KIM  Byeong Gi LEE  

IEICE TRANSACTIONS on Communications   Vol.E82-B    No.3    pp.481-488
Publication Date: 1999/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Switching and Communication Processing

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In this paper, we present the FB (Fair Buffering) mechanism for the efficient support of TCP traffic over UBR connections in the subnet ATM model. We show that both throughput and fairness may be improved by using this congestion control mechanism. The FB mechanism is founded on the observation that the performance of TCP over UBR connections is optimal when the buffer space is allocated in proportion to the connection's bandwidth-delay product. We compare the performance of the existing drop-tail, EB (Equal Buffering) and the proposed FB buffer management schemes, with and without RR (Round-Robin) scheduling, and show through simulation the effectiveness of the proposed FB mechanism when used with the RR scheduling scheme.