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Mixing multiple QoS classes in an IP network
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The main goal of the master thesis project was to investigate and evaluate the forwarding behavior of an edge router performing admission control, when mixing three different UMTS QoS traffic service classes: Conversational, Streaming and Background. One perspective of QoS consists of transmission speed, timeliness of packet delivery, amount of jitter introduced into packet streams, and the probability of packet loss. This work is centered on this perspective and the congestion, latency, jitter and packet loss characteristics. The smallest controllable component in the network is the router or the switch that joins two or more links. These nodes must perform a processing of the packets next hop in a certain manner and with various mechanisms to differentiate queueing and scheduling. This is the per-hop QoS requirement that this work focuses on, and more precisely the Class Based Queueing scheduling mechanism in a Differentiated Services architecture. The method has been to use simulations using the Network Simulator - ns-2. Most important results of the thesis was: • When mixing QoS classes, with one AF class containing streaming traffic with bursting characteristics, the total utilization of the link is strongly dependent of: upper bound admission level of the AF class, peak to mean ratio of the video flows, number of video flows and background best effort flow congestion level. • Using the CBQ scheduling algorithm provides the functionality to achieve QoS when mixing voice and video classified into DiffServ Expedited Forwarding and Assured Forwarding per-hop behavior respectively. QoS was in this thesis achieved with 80-85% utilization of the link with a provisioning as high as 50% to the AF class video streams and a 0 % drop probability to both classes.

Place, publisher, year, edition, pages
2002.
Keyword [en]
Technology, datorkommunikation, QoS, differentiated service, DiffServ
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-51987ISRN: LTU-EX--02/196--SELocal ID: 926f726f-4e6d-4c07-ae3b-e8aaa86a1796OAI: oai:DiVA.org:ltu-51987DiVA: diva2:1025353
Subject / course
Student thesis, at least 30 credits
Educational program
Computer Science and Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
  • html
  • text
  • asciidoc
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