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Adaptive VoIP Transmission over Heterogeneous Wired/Wireless Networks

机译:异构有线/无线网络上的自适应VoIP传输

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摘要

In this paper, we present an adaptive architecture for the transport of VoIP traffic over heterogeneous wired/wireless Internet environments. This architecture uses a VoIP gateway associated with an 802.1 le QoS enhanced access point (QAP) to transcode voice flows before their transmissions over the wireless channel. The instantaneous bit rate is determined by a control mechanism based on the estimation of channel congestion state. Our mechanism dynamically adapts audio codec bit rate using a congestion avoidance technique so as to preserve acceptable levels of quality. A case study presenting the results relative to an adaptive system transmitting at bit rates typical of G.711 PCM (64 kbit/s) and G.726 ADPCM (40, 32, 24 and 16 kbit/s) speech coding standards illustrates the performance of the proposed framework. We perform extensive simulations to compare the performance between our adaptive audio rate control and TFRC mechanism. The results show that the proposed mechanism achieves better voice transmission performance, especially when the number of stations is fairly large.
机译:在本文中,我们提出了一种用于在异构有线/无线Internet环境中传输VoIP流量的自适应体系结构。该体系结构使用与802.1le QoS增强型接入点(QAP)关联的VoIP网关在语音流通过无线信道传输之前对其进行转码。由控制机制基于信道拥塞状态的估计来确定瞬时比特率。我们的机制使用拥塞避免技术动态调整音频编解码器的比特率,以保持可接受的质量水平。案例研究展示了与自适应系统有关的结果,该系统以典型的G.711 PCM(64 kbit / s)和G.726 ADPCM(40、32、24和16 kbit / s)语音编码标准的比特率进行传输,说明了这种性能拟议框架。我们进行了广泛的仿真,以比较自适应音频速率控制和TFRC机制之间的性能。结果表明,所提出的机制具有更好的语音传输性能,尤其是在站点数量较大时。

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