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Proceedings Paper

Video adaptation in ABR channels with explicit rate feedback control
Author(s): Ngai Li; Soung C. Liew
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Paper Abstract

We propose a video adaptation scheme for video transmission over available bit rate channels. We assume that the ABR channel supports a modified version of the explicit rate feedback control scheme, with which video sources can specify their bandwidth needs by placing a demand value in the resource management cells. Bandwidth is distributed among video connections in proportion to their demands. We investigate issues such as 'How should we adapt the video output rate to the allocated bandwidth.' 'How frequently should we change the demand.' and 'How should we adapt the video output rate to the allocated bandwidth.' Based on our investigation, we propose that the bandwidth demand specification should include both the intrinsic bandwidth requirement of a video source and the current smoothing buffer level. We show that by defining the demand this way, we can limit the worst-case buffering delay at the source. We also show that with an encoder-rate controller, the impact of buffer overflow on the video quality can be reduced by discarding bits from video frames evenly.

Paper Details

Date Published: 7 October 1998
PDF: 10 pages
Proc. SPIE 3530, Performance and Control of Network Systems II, (7 October 1998); doi: 10.1117/12.325895
Show Author Affiliations
Ngai Li, Chinese Univ. of Hong Kong (China)
Soung C. Liew, Chinese Univ. of Hong Kong (China)


Published in SPIE Proceedings Vol. 3530:
Performance and Control of Network Systems II
Wai Sum Lai; Robert B. Cooper, Editor(s)

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