Performance Improvement of TCP over EFCI-Based ABR Service Class by Tuning of Congestion Control Parameters (Special Issue on Network Interworking)

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概要

• 論文の詳細を見る

• We investigate performance of TCP protocol over ATM networks by using a simulation technique. As the ATM layer, we consider (1) rate-based control of the ABR service class and (2) an EPD (Early Packet Discard) technique applied to the UBR service class and (3) and EPD with per-VC accounting for fairness enhancement applied to the UBR service class. In comparison, we adopt a multi-hop network model where the multiple ATM switches are interconnected. In such a network, unfairness among connections is a possible cause of the problem due to differences of the number of hops and/or the round trip times among connections. Simulation results show that the rate-based control method of ABR achieves highest throughput and best fairness in most circumstances. However, the performance of TCP over ABR is degraded once the cell loss takes place due to the inappropriate control parameter setting. To avoid this performance degradation, we investigate the appropriate parameter set suitable to TCP on ABR service. As a result, parameter tuning can improve the performance of TCP over ABR, but limited. We therefore consider TCP over ABR with EPD enhancement where the EPD technique is incorporated into ABR. We last consider the multimedia network environment, where the VBR traffic exists in the network in addition to the ABR/UBR traffic. By this, we investigate an applicability of the above observations to a more generic model. Through simulation experiments, we find that the similar results can be obtained, but it is also shown that parameters of the rate-based congestion control must be chosen carefully by taking into account the existence of VBR traffic. For this, we discuss the method to determine the appropriate control parameters.

• 社団法人電子情報通信学会の論文
• 1997-10-25

著者

• MURATA Masayuki

  the Faculty of Engineering Science, Osaka University

• MIYAHARA Hideo

  the Faculty of Engineering Science, Osaka University

• MURATA Masayuki

  Graduate School of Information Science and Technology, Osaka University

• Murata M

  Graduate School Of Information Science And Technology Osaka University

• Murata M

  Osaka Univ. Suita Jpn

• Miyahara H

  Osaka Univ. Suita‐shi Jpn

• Miyahara Hideo

  Graduate School Of Information Science And Technology Osaka University

• Miyahara Hideo

  Graduate School Of Engineering Science Osaka University

• Murata M

  Osaka Univ. Suita‐shi Jpn

• HASEGAWA Go

  the Faculty of Engineering Science, Osaka University

• OHSAKI Hiroyuki

  the Faculty of Engineering Science, Osaka University

• Hasegawa G

  Osaka Univ.

• Miyahara H

  Graduate School Of Information Science And Technology Osaka University

• Miyahara Hideo

  The Faculty Of Engineering Science Osaka University

• Hasegawa Go

  Division Of Pathomorphology Niigata University Graduate School Of Medical And Dental Sciences

• Ohsaki H

  Osaka Univ. Ibaraki‐shi Jpn

• Hasegawa Go

  Division Of Pathomorphology Department Of Cardiovascular And Vital Control Niigata University Gradua

• Murata Masayuki

  The Faculty Of Engineering Science Osaka University

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