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A Simulation Based Performance Evaluation of PRTP
Karlstads universitet, Institutionen för informationsteknologi. (DISCO)ORCID-id: 0000-0003-4147-9487
Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för datavetenskap. (DISCO)ORCID-id: 0000-0001-7311-9334
2002 (engelsk)Rapport (Annet vitenskapelig)
Abstract [en]

PRTP is proposed to address the need of a transport service that is more suitable forapplications with soft real-time requirements, e.g., video broadcasting. It is an extensionfor partial reliability to TCP. The main idea behind PRTP is to exploit the fact thatmany soft real-time applications tolerate a limited amount of packet loss. In particular,PRTP enables an application to trade some of the reliability offered by TCP for improvedthroughput and interarrival jitter. This paper describes the design of PRTP andgives a detailed description of a simulation based performance evaluation. The performanceevaluation involved the performance of PRTP compared to TCP in long- as wellas in short-lived connections and showed that PRTP probably would give significantimprovements in performance, both in terms of throughput and interarrival jitter, for awide range of applications. The performance evaluation also suggested that PRTP is notTCP-friendly and altogether fair against competing flows and thus is not suitable for usein an environment where the main reason for packet loss is congestion, e.g., in a fixedInternet environment. We believe, however, that PRTP could be a viable alternative forwireless applications in error prone environments.

sted, utgiver, år, opplag, sider
Karlstad: Karlstads universitet, 2002. , s. 36
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2002:35
Emneord [en]
simulation, PRTP, partial reliability, retransmission based, stationary, transient, throughput, jitter, fairness, TCP-friendly
HSV kategori
Forskningsprogram
Datavetenskap
Identifikatorer
URN: urn:nbn:se:kau:diva-11841OAI: oai:DiVA.org:kau-11841DiVA, id: diva2:505990
Tilgjengelig fra: 2012-02-27 Laget: 2012-02-27 Sist oppdatert: 2018-06-04bibliografisk kontrollert
Inngår i avhandling
1. Transport Services for Soft Real-Time Applications in IP Networks
Åpne denne publikasjonen i ny fane eller vindu >>Transport Services for Soft Real-Time Applications in IP Networks
2006 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Universitetsbiblioteket, Karlstad University Press, 2006
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2006:8
Emneord
transport protocol, congestion control, partial reliability, soft real-time, SCTP, failover, SIGTRAN, head-of-line blocking
HSV kategori
Forskningsprogram
Datavetenskap
Identifikatorer
urn:nbn:se:kau:diva-912 (URN)91-7063-046-1 (ISBN)
Disputas
2006-06-01, Agardhsalen, 11D 257, Karlstad university, 651 88 Karlstad, 12:40
Opponent
Veileder
Tilgjengelig fra: 2007-06-05 Laget: 2007-06-05 Sist oppdatert: 2018-01-11

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