TCP performance analysis and optimization over DMT based ADSL system

Authors:
Xiaoning He;Hao Che
Affiliations:
Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA;Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA
Venue:
Computer Communications
Year:
2002

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Abstract

This paper studies the transmission control protocol (TCP) performance over a discrete multi-tone (DMT) based asymmetric digital subscriber loop (ADSL) network. The impact of DMT subchannel bit loading on the TCP throughput performance is studied. The simulation results show that there is a threshold for the signal-to-noise ratio (SNR) gap or bit error rate (BER) above which TCP throughput drops quickly. This threshold takes its value in a wide range depending on the TCP round-trip time as well as channel noises. This suggests that it would be insufficient to set a fixed target BER at, e.g. 10^-^7, when calculating the number of bits to be loaded in each subchannels. Instead, the bit loading should take TCP performance into account. Finally a dynamic bit loading scheme is proposed, which jointly optimizes the channel bit rate and TCP throughput performance.