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Robust scalable video multicast and performance issues in wireless LANs
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
2004 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Kista: Mikroelektronik och informationsteknik , 2004.
Series
TRITA-IMIT-TSLAB. AVH, 04:03
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-509OAI: oai:DiVA.org:kth-509DiVA: diva2:14255
Available from: 2005-11-24 Created: 2005-11-24 Last updated: 2016-11-24Bibliographically approved
List of papers
1. Objective end-to-end QoS gain from packet prioritization and layering in MPEG-2 streaming
Open this publication in new window or tab >>Objective end-to-end QoS gain from packet prioritization and layering in MPEG-2 streaming
2002 (English)In: International Packetvideo workshop 2002, 2002Conference paper, Published paper (Refereed)
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.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-8812 (URN)
Note
QC 20111219Available from: 2005-11-24 Created: 2005-11-24 Last updated: 2011-12-19Bibliographically approved
2. Receiver-controlled joint source/channel coding on the application level, for video streaming over WLANs
Open this publication in new window or tab >>Receiver-controlled joint source/channel coding on the application level, for video streaming over WLANs
2003 (English)In: The 57th IEEE Semiannual: 2003. VTC 2003-Spring, 2003, 1558-1561 p.Conference paper, Published paper (Refereed)
Abstract [en]

The proportion of real-time traffic, being transported over Internet protocol (IP) networks, appears to be ever increasing. Real-time traffic may, for example, be video and audio, which have real-time constraints such as maximum delay and delay jitter. Such requirements can be hard to satisfy in a wired infrastructure, and are even more so in a wireless network. Therefore there is a need to make transmission over wireless local area networks (WLANs) more reliable. The aim of this paper is to outline transmission of MPEG-4 video over an IEEE 802.11b WLAN, and to experimentally verify its efficiency. Receiver-driven layered multicast has been proposed before, for dealing with band limitations and environments with heterogeneous terminals. We extend these ideas to handle packet loss, by adding receiver-driven unequal error protection (UEP). The proposal can be viewed as receiver-controlled joint source/channel (JSC) coding on the application level.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-8813 (URN)10.1109/VETECS.2003.1207083 (DOI)
Conference
Vehicular Technology Conference
Note
QC 20111221Available from: 2005-11-24 Created: 2005-11-24 Last updated: 2011-12-21Bibliographically approved
3. MobiCom poster: wireless LAN access points as queuing systems: performance analysis and service time
Open this publication in new window or tab >>MobiCom poster: wireless LAN access points as queuing systems: performance analysis and service time
2003 (English)In: ACM SIGMOBILE Mobile Computing and Communications Review, ISSN 1559-1662, Vol. 7, no 1, 28-30 p.Article in journal (Refereed) Published
Abstract [en]

Since the approval of the IEEE 802.11b by the IEEE in 1999, the demand for WLAN equipment and networks has been growing quickly. We present a queuing model of wireless LAN (WLAN) access points (APs) for IEEE 802.11b. We use experimentation to obtain the characteristic parameters of our analytic model. The model can be used to compare the performance of different WLAN APs as well as the QoS of different applications in the presence of an AP. We focus on the delay introduced by an AP. The major observations are that the delay to serve a packet going from the WLAN medium to the wired medium (on the uplink) is less than the delay to serve a packet, with identical payload, but travelling from the wired medium to the WLAN medium (on the downlink). A key result is an analytic solution showing that the average service time of a packet is a strictly increasing function of payload.

National Category
Communication Systems
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-47870 (URN)10.1145/881978.881985 (DOI)
Note
QC 20111116Available from: 2011-11-14 Created: 2011-11-14 Last updated: 2013-09-09Bibliographically approved

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