Quality of Service Evaluation of Error Control for TCP/IP-Based Systems in Packet Switching ATM Networks

Convolutional decoding using Fano algorithms is one of the most important techniques of channel coding used for error control. It is of interest since they have variable decoding time and are highly sensitive to the channel parameters such as an inaccurate estimate of channel SNR and an incomplete compensation of phase noise. The operation of Fano decoding in this paper is considered in TCP/IP-based ATM packet (fixed size packets) switching networks. The handshaking mechanism with packet-to-packet acknowledgments is implemented. In this paper, we complete a work has been done to compute numerically the mean buffer size by showing an analytical way to reach the final stage of providing explicit expressions for that performance metric. Analytical results are presented for several different channel conditions, packet arrival rates, and decoding time-out limits. KEYWORDS—Convolutional code, Fano decoder, timeout limit, noisy channel, mean buffer size, queuing analysis.