NDLI: An evaluation of quality of service for H.264 over 802.11e WLANs

Content Provider	IEEE Xplore Digital Library
Author	MacKenzie, R. Hands, D. O'Farrell, T.
Copyright Year	2009
Description	Author affiliation: Institute of Advanced Telecommuncations, Swansea University, UK (O'Farrell, T.) \|\| BT Innovate, British Telecommuncations PLC, Adastral Park, Ipswich, UK (Hands, D.) \|\| School of Electronic & Electrical Engineering, University of Leeds, UK (MacKenzie, R.)
Abstract	802.11 wireless local area networks are now a common feature in the home. In order to meet the quality of service (QoS) demands for the increasing number of multimedia applications on these home networks the 802.11e amendment was developed. A suitable video coding standard for these multimedia applications is H.264 due to its high compression and error resilience. In this paper we investigate how the quality of H.264 video is affected as the number of concurrent video streams sent over a multi-rate 802.11e network is increased. Several packet mapping schemes are compared. We show that the mapping schemes which differentiate video packets based on their frame type are more successful at maintaining acceptable video quality when congestion occurs, providing a more gradual quality degradation as congestion increases rather than the cliff-edge quality drop that tends to occur with the other mapping schemes. These differentiated schemes are more successful for videos that do not have a high amount of temporal activity. We also identify that impairments caused by congestion tend to occur towards the bottom of each frame when the flexible macroblock ordering (FMO) feature of H.264 is not used but the use of FMO can reduce this effect.
Starting Page	1
Ending Page	10
File Size	870795
Page Count	10
File Format	PDF
ISBN	9781424446513
DOI	10.1109/PACKET.2009.5152163
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-05-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Video coding Wireless LAN Multimedia systems Quality of service Streaming media Physical layer IPTV IP networks HDTV Testing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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