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Improving mSCTP-based Vertical Handovers by Increasing the Initial Congestion Window
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (DISCO)
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (DISCO)
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (Centrum för HumanIT)ORCID iD: 0000-0003-4147-9487
2011 (English)In: / [ed] Johan Eklund,Karl-Johan Grinnemo, Anna Brunstrom, 2011Conference paper, (Refereed)
Abstract [en]

Wireless networks play an increasingly important role in our daily lives. However, the wireless landscape comprises serveralnetwork technologies, and which technology to use is often context dependent and varies over time: In urban areas, WiFi viaa WiFi hotspot might be the preferred access technology, while in rural areas 3G, HSPA or some other 3GPP technologymight be the only viable alternative. To this end, a large number of vertical handover solutions, ranging from link-level toapplication-level solutions, has been proposed in the past several years.We believe that the Stream Control Transmission Protocol and its extension for Dynamic Address Reconfiguration (mSCTP)make up an attractive vertical handover solution, especially in cases where there are little or no economic incentives to modify orupgrade the existing network infrastructure. Currently, we are implementing an mSCTP-based mobility management frameworkfor Android smartphones and tablets, and as part of that work we are considering ways of mitigating the effects of a handoveron ongoing transport sessions.A mobile terminal with several network interfaces may traverse different types of networks (WLAN, UMTS, HSPA).A seamless handover between these networks may be achieved by the transport protocol, Stream Control TransmissionProtocol(SCTP), with its multihoming facility (mSCTP), in conjunction with a mobility manager monitoring the availablenetwork interfaces. SCTP, a reliable transport protocol, closely related to TCP, encompasses slow-start in the beginning of asession. This slow-start phase is also activated to probe for network capacity on the target path after a handover, which couldresult in unncessarily reduced throughput in case of spare capacity in the network. The throughput degradation in could becrucial for an ongoing real time session, like video conferencing. In this study we have conducted experiments on the benefitof increasing the initial congestion window to reduce the negative impact of the slow start phase. We have by experimentsquantified the performance gain from an increasd initial window, and have seen that there a reduction in maximum transfertime for a message of about 50 % in scenarios with real-time video, compared to the default initial congestion window. Theimprovement is most prominent in sessions with high transfer delays. One easy, and thus very attractive, way to improveon the handover performance is to increase the initial congestion window on the handover target path. Although a seeminglycontroversal proposition, one should bear in mind that researchers at Google and other cloud computing companies are currentlystrongly promoting a drastic increase of TCP’s initial congestion window within IETF.

Place, publisher, year, edition, pages
2011.
National Category
Engineering and Technology
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-12140OAI: oai:DiVA.org:kau-12140DiVA: diva2:509218
Conference
IEEE Swedish Communication Technologies Workshop (Swe-CTW), Stockholm, KTH, October 19-21
Projects
SCTP Smartswitch
Available from: 2012-03-12 Created: 2012-03-12 Last updated: 2014-09-04Bibliographically approved

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