Graceful degradation of mobile video quality over wireless network

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Hussein Muzahim Aziz, Lars Lundberg
Title: Graceful degradation of mobile video quality over wireless network
Conference name: IADIS International Conference Informatics
Year: 2009
Pagination: 175-180
ISBN: 978-972-8924-86-7
Publisher: International Association for Development of the Information Society (IADIS)
City: Algarve, Portugal
Organization: Blekinge Institute of Technology
Department: School of Computing (Sektionen för datavetenskap och kommunikation)
School of Computing S-371 79 Karlskrona
+46 455 38 50 00
http://www.bth.se/com
Authors e-mail: haz@bth.se
Language: English
Abstract: Real-time video transmission over wireless channels has become an important topic in wireless communication because of the limited bandwidth of wireless network that should handle high amount of video frames. Video frames must arrive at the client before the playout time with enough time to display the contents of the frames. Real-time video transmission is particularly sensitive to delay as it has a strict bounded end-to-end delay constraint; video applications impose stringent requirements on communication parameters, such as frame lost and frame dropped due to excessive delay are the primary factors affecting the user-perceived quality. In this study we investigate ways of obtaining a graceful and controlled degradation of the quality, by introducing redundancy in the frame sequence and compensating this by limiting colourcoding and resolution. The effect of that is to use double streaming mechanism, in this way we will obtain less freezing at the expense of limited colours and resolution. Our experiments, applied to scenarios where users can observe three types of dropping load for real time video streaming, the analytical measurements tools are used in this study to evaluate the video quality is the mean opinion score and we will demonstrate this and argue that the proposed technique improves the use perceived of the video quality.
Subject: Computer Science\Networks and Communications
Keywords: Streaming video, duplicate frames, multichannel, dropping rate, switching stream and MOS.
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