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Towards the Next Generation Network: The Softswitch Solution
Karlstad University, Faculty of Economic Sciences, Communication and IT. (DISCO)ORCID iD: 0000-0003-4147-9487
Karlstad University, Faculty of Economic Sciences, Communication and IT. (DISCO)ORCID iD: 0000-0001-7311-9334
2006 (English)Report (Other academic)
Abstract [en]

Over the course of the last fifteen years, the telecommunication market has undergone dramatic changes. In the beginning of the nineties, the market essentially comprised a number of national monopolies. Today, yesterday's monopolies are under siege, and the incumbent operators face strong competition from newly established operators. Furthermore, in recent years broadband-based VoIP providers have entered the telecommunication market as worthy contenders to traditional operators. To be able to survive and thrive in this new, much more competitive, market, traditional wireless and wireline operators have to reduce their capital and operational expenditures. They also need to provide new revenue-generating applications and services. To this end, a large number

of traditional operators has replaced, or seriously consider to replace, their legacy circuit-switched fixed and cellular core networks with IP. As a first step in the migration from circuit-switched technologies to IP, the softswitch solution has evolved. This report provides a comprehensive treatment of the softswitch solution from a technical viewpoint. Additionally, the report

concludes with a brief discussion of the migration steps following the softswitch solution. In particular, an overview of the 3GPP IP Multimedia Subsystem (IMS) is given.

Place, publisher, year, edition, pages
Fakulteten för ekonomi, kommunikation och IT , 2006. , p. 99
Series
Karlstad University Studies, ISSN 1403-8099 ; 2006:6
Keywords [en]
Next Generation Networks, softswitch, signaling, SS7, Parlay, JAIN, H.323, SIP, MEGACO, H.248, SIGTRAN, IMS
National Category
Computer Systems
Identifiers
URN: urn:nbn:se:kau:diva-828ISBN: 91-7063-037-2 (print)OAI: oai:DiVA.org:kau-828DiVA, id: diva2:6563
Available from: 2007-05-10 Created: 2007-05-10 Last updated: 2018-06-04
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
Keywords
transport protocol, congestion control, partial reliability, soft real-time, SCTP, failover, SIGTRAN, head-of-line blocking
National Category
Computer Sciences
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: 2018-01-11

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Grinnemo, Karl-JohanBrunstrom, Anna

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