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Performance of SCTP-controlled Failovers in M3UA-based SIGTRAN Networks
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)
2004 (English)In: Simulations Series, La Jolla, Ca: Society for Computer Simulation , 2004, 86-91 p.Conference paper, Published paper (Refereed)
Abstract [en]

There are some large economic, operational, and, to some extent, technicalincentives to replace the traditional telecom network with IP. However,such a large transition will not happen overnight maybe never. Meanwhile,IP-based and traditional TDM-based telephony will have to co-exist. To addressthis situation, the IETF SIGTRAN working group has developed an architecturefor transportation of Signaling System No. 7 (SS7) traffic over IP. Still, itremains to be shown that the introduction of the SIGTRAN architecture will notsignificantly deteriorate the performance of SS7. To this end, this paperevaluates the failover performance in SIGTRAN networks. Specifically, the paperevaluates the performance of SCTP-controlled failovers in M3UA-based SIGTRAN networks.The paper suggests that in order to obtain a failover performance with SCTPcomparable to that obtained in traditional TDM-based SS7 systems, SCTP has to abandonmany of the configuration recommendations of RFC 2960 and become much more aggressivein its failover behavior. Furthermore, the paper suggests that the SCTP parameterPath.Max.Retrans has a major impact on the SCTP failover performance. Our evaluationalso indicates that for those path propagation delays envisioned in future SIGTRAN networks,the impact of the path propagation delay on the failover performance is marginal

Place, publisher, year, edition, pages
La Jolla, Ca: Society for Computer Simulation , 2004. 86-91 p.
Series
Simulations Series, ISSN 0735-9276 ; 36
Keyword [en]
failover, SCTP, multi-homing, SIGTRAN, M3UA
National Category
Computer Systems
Identifiers
URN: urn:nbn:se:kau:diva-2126OAI: oai:DiVA.org:kau-2126DiVA: diva2:6664
Conference
Applied Telecommunication Symposium (ATS) - Part of Advanced Simulation Technologies Conference (ASTC), Hyatt Regency Crystal City, Arlington, Virginia, April 18-22, 2004
Projects
Reliable and secure communication in SCTP
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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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