On the performance of TCP Vegas over UMTS/WCDMA channels with large round-trip time variations

Anthony Lo, Geert Heijenk

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)
6 Downloads (Pure)

Abstract

Universal Mobile Telecommunications System (UMTS) is a third-generation cellular network that enables high-speed mobile Internet access. This paper evaluates and compares the performance of two well-known versions of Transmission Control Protocol (TCP), namely, Vegas and Reno, in a UMTS environment. Bulk data transfer was considered in the simulation with varying radio channel conditions. We assume that data losses are only due to the radio channel. Simulation results show that the performance of Vegas is worse than Reno even though data losses incurred by the radio channel are completely recovered by the UMTS radio link control layer. This has led us to conduct a thorough investigation on the behavior of Vegas in order to identify the cause of performance degradation in Vegas. The poor performance of Vegas is attributed to the UMTS radio interface characteristics which resulted in large and highly variable TCP round-trip times. Vegas would interpret the round-trip time variation as a sign of congestion, and consequently, shrink its window size which reduces the transmission rate. Furthermore, a sudden increase in the instantaneous round-trip time can trigger spurious timeouts at the TCP sender using Vegas which performs unnecessary retransmissions. Spurious timeouts can lead to significant throughput reduction. Reno, on the other hand, does not show any abnormality and delivers the expected performance.
Original languageUndefined
Title of host publicationProceedings IFIP TC6 9th International Conference on Personal Wireless Communications, PWC 2004
EditorsI.G.M.M. Niemegeers, I.G.M.M. prof.dr.ir. Niemegeers, S.M. Heemstra de Groot, S.M. Dr.ir. Heemstra de Groot
Place of PublicationBerlin
PublisherSpringer
Pages330-342
Number of pages13
ISBN (Print)3-540-23162-5
DOIs
Publication statusPublished - 2004

Publication series

NameLecture Notes in Computer Science
PublisherSpringer-Verlag
Volume3260
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Keywords

  • METIS-219900
  • EWI-2850
  • IR-62891

Cite this

Lo, A., & Heijenk, G. (2004). On the performance of TCP Vegas over UMTS/WCDMA channels with large round-trip time variations. In I. G. M. M. Niemegeers, I. G. M. M. prof.dr.ir. Niemegeers, S. M. Heemstra de Groot, & S. M. Dr.ir. Heemstra de Groot (Eds.), Proceedings IFIP TC6 9th International Conference on Personal Wireless Communications, PWC 2004 (pp. 330-342). [10.1007/b100819] (Lecture Notes in Computer Science; Vol. 3260). Berlin: Springer. https://doi.org/10.1007/978-3-540-30199-8_27
Lo, Anthony ; Heijenk, Geert. / On the performance of TCP Vegas over UMTS/WCDMA channels with large round-trip time variations. Proceedings IFIP TC6 9th International Conference on Personal Wireless Communications, PWC 2004. editor / I.G.M.M. Niemegeers ; I.G.M.M. prof.dr.ir. Niemegeers ; S.M. Heemstra de Groot ; S.M. Dr.ir. Heemstra de Groot. Berlin : Springer, 2004. pp. 330-342 (Lecture Notes in Computer Science).
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keywords = "METIS-219900, EWI-2850, IR-62891",
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Lo, A & Heijenk, G 2004, On the performance of TCP Vegas over UMTS/WCDMA channels with large round-trip time variations. in IGMM Niemegeers, IGMM prof.dr.ir. Niemegeers, SM Heemstra de Groot & SM Dr.ir. Heemstra de Groot (eds), Proceedings IFIP TC6 9th International Conference on Personal Wireless Communications, PWC 2004., 10.1007/b100819, Lecture Notes in Computer Science, vol. 3260, Springer, Berlin, pp. 330-342. https://doi.org/10.1007/978-3-540-30199-8_27

On the performance of TCP Vegas over UMTS/WCDMA channels with large round-trip time variations. / Lo, Anthony; Heijenk, Geert.

Proceedings IFIP TC6 9th International Conference on Personal Wireless Communications, PWC 2004. ed. / I.G.M.M. Niemegeers; I.G.M.M. prof.dr.ir. Niemegeers; S.M. Heemstra de Groot; S.M. Dr.ir. Heemstra de Groot. Berlin : Springer, 2004. p. 330-342 10.1007/b100819 (Lecture Notes in Computer Science; Vol. 3260).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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AB - Universal Mobile Telecommunications System (UMTS) is a third-generation cellular network that enables high-speed mobile Internet access. This paper evaluates and compares the performance of two well-known versions of Transmission Control Protocol (TCP), namely, Vegas and Reno, in a UMTS environment. Bulk data transfer was considered in the simulation with varying radio channel conditions. We assume that data losses are only due to the radio channel. Simulation results show that the performance of Vegas is worse than Reno even though data losses incurred by the radio channel are completely recovered by the UMTS radio link control layer. This has led us to conduct a thorough investigation on the behavior of Vegas in order to identify the cause of performance degradation in Vegas. The poor performance of Vegas is attributed to the UMTS radio interface characteristics which resulted in large and highly variable TCP round-trip times. Vegas would interpret the round-trip time variation as a sign of congestion, and consequently, shrink its window size which reduces the transmission rate. Furthermore, a sudden increase in the instantaneous round-trip time can trigger spurious timeouts at the TCP sender using Vegas which performs unnecessary retransmissions. Spurious timeouts can lead to significant throughput reduction. Reno, on the other hand, does not show any abnormality and delivers the expected performance.

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Lo A, Heijenk G. On the performance of TCP Vegas over UMTS/WCDMA channels with large round-trip time variations. In Niemegeers IGMM, prof.dr.ir. Niemegeers IGMM, Heemstra de Groot SM, Dr.ir. Heemstra de Groot SM, editors, Proceedings IFIP TC6 9th International Conference on Personal Wireless Communications, PWC 2004. Berlin: Springer. 2004. p. 330-342. 10.1007/b100819. (Lecture Notes in Computer Science). https://doi.org/10.1007/978-3-540-30199-8_27