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Optimal packet scheduling algorithms for token-bucket based rate control

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2 Author(s)
Mehta, Neerav Bipin ; Image Formation and Processing Group, Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA ; Karandikar, A.

In this paper, we consider a scenario in which the source has been offered QoS guarantees subject to token-bucket regulation. The rate of the source should be controlled such that it conforms to the token-bucket regulation, and also the distortion obtained is the minimum. We have developed an optimal scheduling algorithm for offline (like pre-recorded video) sources with convex distortion function and which can not tolerate any delay. This optimal offline algorithm has been extended for the real-time online source by predicting the number of packets that the source may send in future. The performance of the online scheduler is not substantially degraded as compared to that of the optimal offline scheduler. A sub-optimal offline algorithm has also been developed to reduce the computational complexity and it is shown to perform very well. We later consider the case where the source can tolerate a fixed amount of delay and derive optimal offline algorithm for such traffic source.

Published in:

Communications and Networks, Journal of  (Volume:7 ,  Issue: 1 )