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Objective End-to-End QoS Gain from Packet Prioritization and Layering in MPEG-2 Streaming
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (MUCOM)
(MUCOM)
2002 (English)In: International Packetvideo workshop 2002, 2002Conference paper, (Other academic)
Abstract [en]

Layered video coding as well as prioritized packet scheduling are two well-known methods that may improve the quality of service level in real-time applications with high bandwidth requirements, and are used over packet switched networks. However, it is often difficult to get an idea of, and to quantify, the actual gains that may be achievable, especially from an end-to-end perspective.In this paper, we present some experimental results from using temporally layered MPEG-2 video combined with basic per-layer IP packet prioritization. The goal has been to find out if a basic scheme is useful at all in combination with this particular source coding method, and if so, how much the objective video quality can be increased during bandwidth-constrained periods. The quality is measured in terms of PSNR and the results are compared to the case of equal packet priority. Also, different packet sizes as well as packet queuing disciplines are used. We conclude that using even a relatively simple temporal layering strategy in combination with packet prioritization can quite significantly improve the end-to-end quality of MPEG-2 video, especially in moderately bandwidth constrained situations. Furthermore, packet size and queuing discipline is found to have an impact.

Place, publisher, year, edition, pages
2002.
Keyword [en]
MPEG-2, layered video, quality of service, traffic shaping
National Category
Computer Science
Identifiers
URN: urn:nbn:se:miun:diva-408Local ID: 545OAI: oai:DiVA.org:miun-408DiVA: diva2:2034
Available from: 2008-12-04 Created: 2008-09-19 Last updated: 2011-04-06Bibliographically approved
In thesis
1. Bandwidth Efficient IPTV Distribution: On Error Resilience and Fast Channel Change
Open this publication in new window or tab >>Bandwidth Efficient IPTV Distribution: On Error Resilience and Fast Channel Change
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Television is now changing its traditional distribution forms to being distributed digitally over broadband networks. The recent development of broadband Internet connectivity has made the transition to Internet Protocol Television (IPTV) possible. When changing distribution technique of an existing service, it is important that the new technique does not make the service worse from the user’s point of view. Although a broadband network offers high capacity and has excellent performance there will be occasional packet losses and delays which could negatively influence the user experience of the delivered broadband service. Since bandwidth is a key constraint for video distribution there is a strong incentive for finding schemes to increase bandwidth utilization, especially when distributing high bandwidth IPTV services. In digital video coding it is common to use predictive coding to remove temporal redundancy in video sequences. This technique greatly increases the coding efficiency but makes the sequence more sensitive to information loss or delay. In addition, the use of predictive coding also introduce a inter frame dependency which could make the channel change significantly slower.

This thesis addresses two important areas related to bandwidth efficient IPTV distribution, namely error resilience and fast channel change. A method to numerically estimate the decoded objective video quality of scalable coded video is presented and evaluated. The method can be used to estimate objective video quality for a scalable video transmission system subject to packet-loss. The quality gain of temporally scalable video in a priority packet dropping environment is also investigated and quantified. Synchronization Frames for Channel Switching (SFCS) is proposed as a method to code and distribute video with IP-multicast, which can be used to efficiently combat packet-loss, increase bandwidth utilization, and offer a channel change speed up. The performance of SFCS is analyzed and bandwidth estimation expressions are formulated, analytical results are complemented with computer simulations. The results show that SFCS deployed in an IPTV delivery system can significantly lower the bandwidth consumption and speed up the channel change.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden Univ, 2007
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 39
Keyword
IPTV distribution
National Category
Information Science
Identifiers
urn:nbn:se:miun:diva-52 (URN)978-91-85317-77-6 (ISBN)
Public defence
2008-01-17, Campus Sundsvall L111, 13:15 (English)
Opponent
Supervisors
Available from: 2007-12-21 Created: 2007-12-21 Last updated: 2010-06-08Bibliographically approved

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http://amp.ece.cmu.edu/packetvideo2002/papers/61-ananhseors.pdf

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