Radio Link Buffer Management and Scheduling for Wireless Video Streaming |
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Authors: | Günther Liebl Hrvoje Jenkac Thomas Stockhammer Christian Buchner |
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Affiliation: | 1. Lehrstuhl für Nachrichtentechnik (LNT), Technische Universit?t München (TUM), D-80290, München, Germany 2. Nomor Research GmbH, D-83346, Bergen, Germany
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Abstract: | In this paper we compare strategies for joint radio link buffer management and scheduling for wireless video streaming. Based
on previous work in this area 8], we search for an optimal combination of scheduler and drop strategy for different end-to-end
streaming options including timestamp-based streaming and ahead-of-time streaming, both with variable initial playout delay.
We will show that a performance gain versus the two best drop strategies in Liebl et al. 8], i.e. drop the HOL packet or
drop the packet with the lowest priority starting from HOL, is possible: Provided that some basic side-information on the
structure of the incoming video stream is available, a more sophisticated drop strategy removes packets from an HOL group
of packets in such a way that the temporal dependencies usually present in video streams are not violated. This advanced buffer
management scheme yields significant improvements for almost all investigated scheduling algorithms and streaming options.
In addition, we will demonstrate the importance of fairness among users when selecting a suitable scheduler, especially if
ahead-of-time streaming is to be applied: Given a reasonable initial playout delay at the streaming media client, both the
overall achievable quality averaged over all users, as well as the individual quality of users with bad channel conditions
can be increased significantly by trading off fairness with maximum throughput of the system. |
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Keywords: | radio link buffer management scheduling wireless shared channel video streaming |
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