Performance Analysis of TCP over Wired-Wireless Networks with Go-back-N ARQ Protocol

上石 唯貴 (9951201)

Transmission Control Protocol (TCP) which plays an important role as the reliable transport protocol, are tuned to perform well over wired networks where packet losses occur mostly because of congestion. On the other hand, over wired-wireless networks, TCP suffers from significant throughput degradation because of random loss resulting from the quality variations of the wireless channel due to fading, shadowing, noise, and so on. Therefore it has been suggested that an appropriate link-layer automatic repeat request (ARQ) protocol is efficient for improving TCP performance over wired-wireless networks. In this study, we analyze the performance of TCP over wired-wireless networks with Go-back-N ARQ protocol. We consider a discrete-time single-server queueing system with finite buffer and derive the TCP throughput using the empirical knowledge of bandwidth-delay product. Numerical results show how the TCP throughput is affected by the quality variation of the wireless channel and the window size of Go-back-N ARQ.