{"title":"TCP performance analysis and optimization over DMT based ADSL systems","authors":"Xiaoning He, Hao Che","doi":"10.1109/ICC.2001.936676","DOIUrl":null,"url":null,"abstract":"This paper studies the TCP performance over a DMT based 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 noise. This suggests that it would be insufficient to set a fixed target BER at, e.g., 10/sup -7/, when calculating the number of bits to be loaded in each subchannel. 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.","PeriodicalId":203874,"journal":{"name":"ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2001-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICC.2001.936676","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
This paper studies the TCP performance over a DMT based 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 noise. This suggests that it would be insufficient to set a fixed target BER at, e.g., 10/sup -7/, when calculating the number of bits to be loaded in each subchannel. 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.
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