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Performance Benefits of Avoiding Head-of-Line Blocking in SCTP
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (DISCO)ORCID iD: 0000-0003-4147-9487
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (DISCO)
Tieto Enator AB, Karlstad.
2005 (English)In: Autonomic and Autonomous Systems and International Conference on Networking and Services, 2005. ICAS-ICNS 2005. Joint International Conference on, IEEE , 2005, 44- p.Conference paper, Published paper (Refereed)
Abstract [en]

Mitigating the effects of head-of-line blocking (HoLB) was one of the major reasons the IETF SIGTRAN working group developed SCTP, a new transport protocol for PSTN signaling traffic, in the first place. However, studies of the impact of HoLB blocking on TCP and SCTP have given ambiguous results as to whether HoLB has, in fact, any significantly deteriorating effect on transmission delay. To this end, we have carried out a detailed experimental study on the quantitative effects of HoLB. Our study suggests that although HoLB could indeed incur a substantial delay penalty on a small fraction of the messages in an SCTP session, it has only a marginal impact on the average end-to-end transmission delay. We only observed improvements in the range of O% to 18% in average message transmission delay of using unordered delivery as compared to ordered delivery. Furthermore, there was a large variability in between different test runs, which often made the impact of HoLB statistically insignificant

Place, publisher, year, edition, pages
IEEE , 2005. 44- p.
Keyword [en]
Communication industry, Computer science, Costs, Delay effects, Manufacturing, Streaming media, TCPIP, Telecommunications, Testing, Transport protocols
National Category
Computer Systems
Identifiers
URN: urn:nbn:se:kau:diva-2125DOI: 10.1109/ICAS-ICNS.2005.73ISBN: 0-7695-2450-8 (print)OAI: oai:DiVA.org:kau-2125DiVA: diva2:6663
Conference
Joint International Conference on Autonomic/Autonomous Systems (ICAS) and International Conference on Networking and Services (ICNS), Tahiti, October 23-28, 2005
Available from: 2007-06-05 Created: 2007-06-05 Last updated: 2014-09-04Bibliographically approved
In thesis
1. Transport Services for Soft Real-Time Applications in IP Networks
Open this publication in new window or tab >>Transport Services for Soft Real-Time Applications in IP Networks
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

In recent years, Internet and IP technologies have made inroads into almost every communication market ranging from best-effort services such as email and Web, to soft real-time applications such as VoIP, IPTV, and video. However, providing a transport service over IP that meets the timeliness and availability requirements of soft real-time applications has turned out to be a complex task. Although network solutions such as IntServ, DiffServ, MPLS, and VRRP have been suggested, these solutions many times fail to provide a transport service for soft real-time applications end to end. Additionally, they have so far only been modestly deployed. In light of this, this thesis considers transport protocols for soft real-time applications.

Part I of the thesis focuses on the design and analysis of transport protocols for soft real-time multimedia applications with lax deadlines such as image-intensive Web applications. Many of these

applications do not need a completely reliable transport service, and to this end Part I studies so-called partially reliable transport protocols, i.e., transport protocols that enable applications to explicitly trade reliability for improved timeliness. Specifically, Part I investigates the feasibility of designing retransmission-based, partially reliable transport protocols that are congestion aware and fair to competing traffic. Two transport protocols are presented in Part I, PRTP and PRTP-ECN, which are both extensions to TCP for partial reliability. Simulations and theoretical analysis suggest that these transport protocols could give a substantial improvement in throughput and jitter as compared to TCP. Additionally, the simulations indicate that PRTP-ECN is TCP friendly and fair against competing congestion-aware traffic such as TCP flows. Part I also presents a taxonomy for retransmission-based, partially reliable transport protocols.

Part II of the thesis considers the Stream Control Transmission Protocol (SCTP), which was developed by the IETF to transfer telephony signaling traffic over IP. The main focus of Part II is on

evaluating the SCTP failover mechanism. Through extensive experiments, it is suggested that in order to meet the availability requirements of telephony signaling, SCTP has to be configured much more aggressively than is currently recommended by IETF. Furthermore, ways to improve the transport service provided by SCTP, especially with regards to the failover mechanism, are suggested. Part II also studies the effects of Head-of-Line Blocking (HoLB) on SCTP transmission delays. HoLB occurs when packets in one flow block packets in another, independent, flow. The study suggests that the

short-term effects of HoLB could be substantial, but that the long-term effects are marginal.

Place, publisher, year, edition, pages
Universitetsbiblioteket, Karlstad University Press, 2006
Series
Karlstad University Studies, ISSN 1403-8099 ; 2006:8
Keyword
transport protocol, congestion control, partial reliability, soft real-time, SCTP, failover, SIGTRAN, head-of-line blocking
National Category
Computer Science
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-912 (URN)91-7063-046-1 (ISBN)
Public defence
2006-06-01, Agardhsalen, 11D 257, Karlstad university, 651 88 Karlstad, 12:40
Opponent
Supervisors
Available from: 2007-06-05 Created: 2007-06-05 Last updated: 2012-02-28

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Citation style
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