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Efficient video multiplexing for delay-sensitive sources based on leaky-bucket characterization

机译：基于漏桶特征的延迟敏感源高效视频多路复用

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Abstract: We are concerned about the transmission of delay-sensitive Variable Bit Rate Video (VBR) MPEG-2 sources over the Asynchronous Transfer Mode (ATM) networks. VBR sources allow the use of statistical multiplexing in the network to improve bandwidth utilization. In order to allow for an efficient multiplexing in the network, video sources must be well characterized in order to provide a precise estimation of the network resources needed by the source to achieve quality of service (QoS) requirements. The VBR-rt transfer capability defined by the ATM forum and the ITU-T uses two couples of leaky-bucket parameters as traffic descriptors for the VBR traffic: (the Peak Cell Rate, and CDVT) and, (the Sustainable Cell Rate, the Intrinsic Burst Tolerance). In previous works, we have shown that these traffic descriptors are too conservative and could allow only a very poor network utilization. We have also shown that an efficient multiplexing of VBR video sources could be achieved if the source rate distribution is modeled by a Gamma distribution characterized by the source mean rate and variance. We present in this paper an algorithm that allows the translation of the leaky-bucket parameters into the mean rate and variance needed for efficient video multiplexing. Therefore, for a source controlling its rate to be compliant with the leaky bucket parameters, the corresponding maximum rate variance could be estimated thus allowing a more efficient video multiplexing while maintaining QoS requirements. !23
机译：摘要：我们关注延迟敏感的可变比特率视频（VBR）MPEG-2源在异步传输模式（ATM）网络上的传输。 VBR源允许在网络中使用统计复用，以提高带宽利用率。为了允许在网络中进行有效的多路复用，必须对视频源进行充分的特性分析，以便对源实现服务质量（QoS）要求所需的网络资源进行精确估计。由ATM论坛和ITU-T定义的VBR-rt传输功能使用两对漏桶参数作为VBR流量的流量描述符：（峰值信元速率和CDVT）和（（可持续信元速率，内在突发耐受性）。在以前的工作中，我们已经表明这些流量描述符过于保守，可能只允许非常差的网络利用率。我们还表明，如果通过以源平均速率和方差为特征的Gamma分布来建模源速率分布，则可以实现VBR视频源的有效复用。我们在本文中提出了一种算法，该算法允许将漏桶参数转换为有效视频多路复用所需的平均速率和方差。因此，对于控制其速率以符合泄漏桶参数的源，可以估计相应的最大速率方差，从而在保持QoS要求的同时允许更有效的视频多路复用。 ！23

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