基于H.248协议的视频通信带宽分配策略  

A Bandwidth Allocation Strategy for Video Communications Based on H.248 Protocol

作　　者：宋彬[1] 郭春芳[1] 秦浩[1] 

机构地区：[1]西安电子科技大学ISN国家重点实验室,陕西西安710071

出　　处：《电子学报》2009年第2期393-397,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60802032);ISN国家重点实验室资助课题

摘　　要：本文基于H.248协议和视频主观质量的评估模型,给出媒体网关控制器重新分配带宽的算法,并针对网络状况的变化,提出保证不同等级终端服务质量的带宽调整算法和保证整体视频主观质量最大化的带宽分配算法.由实验结果可知,网络带宽急剧下降而导致视频质量恶化时,使用本文提出的算法进行多次调整后,用户终端恢复图像的平均PSNR(峰值信噪比)可以提高15dB以上,有效保证恢复视频的主客观质量.另外,当网络带宽下降到无法满足多个终端所需的视频服务质量时,该策略会尽可能保证整体视频主观质量最大化.Based on H.248 protocol and the estimation model of video subjective quality,a bandwidth allocation strategy for video communications in next generation network is presented.Then,aiming at the different change of network status,two algorithms of the bandwidth allocation are proposed,one of which is used to guarantee the QoS（quality of service）of the different classes of terminals,and the other of which is used to maximize the total video subjective quality of all the terminals.When the network status has changed worse,experimental results show that the average PSNR（peak signal-to-noise ratio）of recovery video quality can be increased by more than 15dB using the proposed algorithm.In addition,when the network status has degraded too much to guarantee the QoS of all the active terminals,the proposed bandwidth allocation algorithm can also guarantee the total video subjective quality of all the terminals as maximal as possible.

关 键 词：下一代网络 视频通信 H.248协议 服务质量 

分 类 号：TP919.8[自动化与计算机技术]