Change search
ReferencesLink to record
Permanent link

Direct link
Why buffers in switching systems do not essentially improve QoS: An analytical case study for aggregated On-off traffic
Responsible organisation
2002 (English)Conference paper (Refereed) PublishedAlternative title
Varför buffertar i switch system inte förbättrar tjänstekvalitén på avsevärd sätt : En analytisk fallstudie för trafik från On-off källor (Swedish)
Abstract [en]

Traffic models with a rate varying according to a Gaussian distribution are commonly used to evaluate statistical multi-plexing in telecommunication systems. The superposition of a sufficient large number of homogeneous Markovian On-Off sources asymptotically approaches an Ornstein-Uhlenbeck process (OUP) which represents a Gaussian process with ex-ponential autocorrelation function. We derive a simple expression for the bandwidth demand under QoS constraints which is close to numerical OUP/D/1 analysis results over the entire parameter region with relevance to applications. In com-parison, results of the fluid flow method for fixed aggregation level are used to verify the OUP/D/1 asymptotics and to estimate its accuracy depending on the number of aggregated flows. Moreover, the OUP/D/1 asymptotics provides a useful check of the accuracy of bounds and approximations proposed in the literature in order to improve the effective bandwidth principle. Based on analytical evaluation, the efficiency of buffers for voice traffic is finally shown to be very limited, i.e. no more than 2% of bandwidth can be saved owing to buffers with regard to real time constraints and a predefined loss probability as QoS demands for voice.

Abstract [sv]

Pappret visar att man tjänar inte mycket på bandbredden genom att buffrar rösttrafik i ett nätverk.

Place, publisher, year, edition, pages
Boston: SPIE , 2002.
Keyword [en]
On-off sources, Gaussian traffic, Ornstein-Uhlenbeck process, dimensioning, statistical multiplexing gain
National Category
URN: urn:nbn:se:bth-9975Local ID: diva2:837980
Internet Performance Control of Network Systems
COST Technical Document 279TD(02)013. Presented at the Leidschendam meeting (Feb. 2002). See from: 2012-09-18 Created: 2002-09-03 Last updated: 2015-06-30Bibliographically approved

Open Access in DiVA

fulltext(191 kB)5 downloads
File information
File name FULLTEXT01.pdfFile size 191 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Fiedler, Markus

Search outside of DiVA

GoogleGoogle Scholar
Total: 5 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 14 hits
ReferencesLink to record
Permanent link

Direct link