基于语音流统计特性的VoIP容量分析与提升算法

Analysis and lifting algorithm of VoIP capacity based on the statistical property of voice streams

在研究IEEE802.16标准关于VoIP传输机制的基础上,指出语音流的静默特性严重制约了VoIP的容量。通过分析VoIP业务流的统计特性得出了在统计复用情况下VoIP的容量极限。提出了一种基于统计复用的带宽调度方法及其实现算法,以克服由于语音静默带来的语音速率波动。仿真结果表明,该调度方法与UGS（unsolicited grant service）调度相比能够显著提升VoIP的容量,同时使BS和SS之间的VoIP丢包率和传输时延保持在0.02%和5.1ms以下。

Based on the studying of the transport mechanism of VoIP in the IEEE 802.16 standard, the fact that the silence of VoIP seriously constrains the VoIP capacity was pointed. According to the analysis on the statistical properties of VoIP traffic streams, the VoIP capacity limit was attained under the condition of statistical multiplexing. A scheduling method and its corresponding implementation algorithm were presented in order to overcome the rate fluctuation due to the silence. The simulation results show that this scheduling can remarkably improve the capacity compared to unsolicited grant service （UGS） scheduling, in addition, it can make the packet drop rate and the transport delay between BS and SS less than 0.02% and 5. lms, respectively.