ATM环境下VBR与CBR视频业务的比较研究

[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications Pub Date : 1992-06-14 DOI:10.1109/ICC.1992.268221

T. Tanaka, S. Okubo, H. Hashimoto, H. Yasuda

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引用次数: 8

摘要

作者比较了异步传输模式(ATM)环境下的恒定比特率(CBR)和可变比特率(VBR)视频业务。采用CCITT SGXV简化网络模型估计VBR业务的统计复用增益。目前的NNI(网络节点接口)容量为150或600mb /s，被认为太小，无法有效支持VBR编码的平均比特率为5-10 Mb/s的标准电视信号。从业务的角度来看，漏桶技术在平均比特率使用参数控制方面优于滑动窗口技术。如果使用滑动窗口，在VBR视频业务中并不总是保证较高的图像质量和较短的延迟。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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A study on comparison between VBR and CBR video service in ATM environment

The authors compare constant bit rate (CBR) and variable bit rate (VBR) video services in an asynchronous transfer mode (ATM) environment. The simplified network model of CCITT SGXV is used to estimate the statistical multiplexing gain for VBR service. Current NNI (network node interface) capacities, 150 or 600 Mb/s, are determined to be too small to effectively support standard television signals that are VBR coded at average bit rates of 5-10 Mb/s. It is also shown that the leaky bucket technique is superior to the sliding window technique for an average bit rate usage parameter control from the service point of view. If sliding window is used, higher picture quality and shorter delay are not always guaranteed in VBR video services.<>

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[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications

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