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近几年来以H.323标准为基础的IP网络会议系统得到迅速发展。随着高速网络建设步伐的加快和会议规模的扩大,采用集中控制的H.323系统中执行会议控制功能的多点控制单元(MCU)可能成为系统瓶颈。该文在研制视频会议系统的基础上,采用基于检测点的方法对MCU性能问题进行分析,不仅准确预计MCU的最大接入容量和评价MCU在多处理结构的扩展性,而且经过实验发现MCU的主要性能瓶颈在网络发送模块,因此进一步提高MCU的接入容量必须优化网络发送模块。实验中还发现没有路由器的网络环境下,MCU对语音和视频的转发时延没有明显差别,为了尽量减少时延,MCU不需要进行音视频同步缓冲处理。
In recent years, the H.323 standard based IP network conferencing system has been rapidly developed. With the speeding up of high-speed network construction and the expansion of the conference scale, a multi-point control unit (MCU) that implements conference control functions in a centrally-controlled H.323 system may become a system bottleneck. Based on the development of video conferencing system, this paper analyzes the performance of MCU based on the detection point method, not only predicting the maximum access capacity of MCU and evaluating the scalability of MCU in multiprocessing structure, but also finding that MCU The main performance bottleneck in the network to send the module, so to further improve the MCU access capacity must optimize the network to send the module. The experiment also found no routers in the network environment, MCU voice and video forwarding delay no significant difference, in order to minimize latency, MCU does not require audio and video synchronization buffer.