Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Impact of Slow Start on SCTP Handover Performance
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. (Centre for HumanIT)
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. (Centre for HumanIT)
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (Centre for HumanIT)ORCID iD: 0000-0003-4147-9487
Show others and affiliations
2011 (English)In: Proceedings of 20th International Conference on Computer Communications and Networks: ICCCN2011, IEEE conference proceedings, 2011Conference paper, (Refereed)
Abstract [en]

The rapidly growing interest in untethered Internet connections, especially in terms of WLAN and 3G/4G mobile connections, calls for intelligent session management: a mobile device should be able to provide a reasonable end-user experience despite location changes, disconnection periods and, not least, handovers. As part of an effort to develop a SCTP-based session management framework that meets these criteria, we are studying ways of improving the SCTP handover delay for real-time traffic; especially the startup delay on the connection between a mobile device and the target access point. To obtain an appreciation of the theoretically feasible gains of optimizing the startup delay on the handover-target path, we have developed a model that predicts the transfer times of SCTP messages during slow start. This paper experimentally validates our model and demonstrates that it could be used to predict the message transfer times in a variable bitrate flow by approximating the variable flow with a constant dito. It also employs our model to obtain an appreciation of the startup delay penalties incured by slow start during handovers in typical mobile, real-time traffic scenarios.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011.
Series
IEEE International Conference on Computer Communications and Networks
Keyword [en]
Bit rate, Delay, IP networks, Internet, Mobile communication, Mobile handsets, Real time systems
National Category
Computer Science
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-10787DOI: 10.1109/ICCCN.2011.6005825ISI: 000299260700072ISBN: 978-1-4577-0637-0 (print)OAI: oai:DiVA.org:kau-10787DiVA: diva2:494342
Conference
Flexibility in Broadband Wireless Access Network (FlexBWAN) Workshop, August 1-4, 2011, Maui, HI
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2016-08-12Bibliographically approved
In thesis
1. Latency Reduction for Soft Real-Time Traffic using SCTP Multihoming
Open this publication in new window or tab >>Latency Reduction for Soft Real-Time Traffic using SCTP Multihoming
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

More and more so-called soft real-time traffic is being sent over IP-based networks. The bursty, data-limited traffic pattern as well as the latency requirements from this traffic present challenges to the traditional communication techniques, designed for bulk traffic without considering latency.

To meet the requirements from soft real-time traffic, in particular from telephony signaling, the Stream Control Transmission Protocol (SCTP) was designed. Its support for connectivity to multiple networks, i.e., multihoming, provides robustness and opens up for concurrent multipath transfer (CMT) over multiple paths. Since SCTP is a general transport protocol, it also enables for handover of media sessions between heterogeneous networks. Migrating an ongoing session to a new network, as well as CMT with minimal latency, requires tuning of several protocol parameters and mechanisms.

This thesis addresses latency reduction for soft real-time traffic using SCTP multihoming from three perspectives. The first focus is on latency for signaling traffic in case of path failure, where a path switch, a failover, occurs. We regard quick failure detection as well as rapid startup on the failover target path. The results indicate that by careful parameter tuning, the failover time may be significantly reduced. The second focus in the thesis is on latency for signaling traffic using CMT. To this end, we address sender-side scheduling. We evaluate some existing schedulers, and design a dynamic stream-aware scheduler. The results indicate that the dynamic stream-aware scheduler may provide significantly improved latency in unbalanced networks. Finally, we target multihomed SCTP to provide for handover of a media session between heterogeneous wireless networks in a mobile scenario. We implement a handover scheme and our investigation shows that SCTP could provide for seamless handover of a media session at walking speed.

Abstract [en]

So-called soft real-time traffic may be sent over IP-based networks. The bursty, data-limited traffic pattern and the latency requirements from this traffic present a challenge to traditional communication techniques. The Stream Control Transmission Protocol (SCTP), with support for multihoming, was designed to better meet the requirements from soft-real time traffic. Multihoming provides for robustness and for concurrent multipath transfer (CMT) as well as for handover of sessions between heterogeneous networks. Still, to meet the timeliness requirements, tuning of protocol parameters and mechanisms is crucial.

This thesis addresses latency reduction for soft real-time traffic using SCTP multihoming. The first focus is on signaling traffic in case of path failure, where a path switch, a failover, occurs. We show that careful parameter tuning may reduce the failover time significantly. The second focus is on signaling traffic using CMT. We address sender-side scheduling and show that dynamic stream-aware scheduling may reduce latency when data is transmitted over asymmetric network  paths. The third focus is multihomed SCTP for handover between heterogeneous networks, where we show that SCTP could provide for seamless handover of a media session at walking speed.

Place, publisher, year, edition, pages
Karlstad: Karlstad University Press, 2016. 34 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2016:14
Keyword
transport protocol, SCTP, multihoming, latency, performance evaluation, failover, concurrent multipath transfer, scheduling, mobility, handover
National Category
Computer Science
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-40713 (URN)978-91-7063-693-6 (ISBN)
Public defence
2016-06-17, 21A342, Karlstad, 09:30 (English)
Opponent
Supervisors
Note

Paper 3 (Efficient Scheduling to Reduce Latency...) ingick i avhandlingen som manuskript med samma namn.

Available from: 2016-05-18 Created: 2016-02-25 Last updated: 2017-03-07Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Eklund, JohanBrunström, AnnaGrinnemo, Karl-Johan
By organisation
Department of Computer ScienceCentre for HumanIT
Computer Science

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 405 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf