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Traffic smoothing and bandwidth allocation for VBR MPEG-2 video connections in ATM network

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3 Author(s)
Zhongyong Guo ; Dept. of Electr. Eng., Tech. Univ. Nova Scotia, Halifax, NS, Canada ; Jian Ni ; Yang, T.

We studied the traffic smoothing and bandwidth allocation issues for VBR MPEG-2 video connections in an ATM network. First of all, the statistical characteristics of VBR MPEG-2 video sequences were examined by real observation. The obtained results showed that it would be very difficult to efficiently allocate an appropriate amount of bandwidth if such traffic were straightforwardly feed into the network. We therefore introduced a so called macro-frame (M-frame) smoothing scheme. It was found that the smoothed traffic not only possesses relatively simple characteristics but also makes the bandwidth allocation more efficient. In consideration of the fact that there is not yet a proper bandwidth allocation algorithm for VBR MPEG-2 connections, we examined and compared the simple peak rate allocation and Gaussian approximation. It was found that (1) peak rate allocation is far more inefficient than the actual need and (2) Gaussian approximation is surprisingly accurate and efficient in estimating the bandwidth, especially in the case of smoothed traffic

Published in:

Computer Communications and Networks, 1995. Proceedings., Fourth International Conference on

Date of Conference:

20-23 Sep 1995

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