摘要
研究表明VBR视频流量具有较强的长时相关性和突发性,该文利用高阶自回归过程预测其流量,并进行概率分布转换,同时提出了一种新的动态带宽分配算法--滞回算法,与Chiruvolu(1998)提出的门限算法,及Iraqi(1999)提出的基于GOP场景检测的带宽分配方案相比,对缓存尺寸的需求、信元丢失率等性能有明显提高。仿真表明,该算法能够以较低的开销(带宽重分配次数百分比≤2%)同时兼顾了信元丢失率和带宽利用率,而且只有在缓存队长超过迂回门限时才触发带宽重分配过程,有利于在线实现。
With lots of studies, it is admitted that the variable bit rate video traffic exhibits high long range dependence and burstness. Its traffic is predicted by auto-regressive process with high order in this paper while the probablity distribution of traffic predicted is also transformed to that of real situation. And then a new dynamic bandwidth allocation algorithm named hysteresis algorithm is presented, by which performances of buffer size requirement and cell loss rate are both improved significantly compared with threshold algorithm presented by Chiruvolu (1998) and allocation scheme based on group of pirclures scene detection presented by Iraqi (1999). The proposed algorithm gives attention to both cell loss rate and utilization at the considerate low cost (reallocation frequency≤2%) according to a number of simulations. And the bandwidth reallocation process is only triggered when the queuing length of buffer surpasses the roundabout threshold so that it is easy for online realization.
出处
《电子与信息学报》
EI
CSCD
北大核心
2005年第5期762-766,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60472034)资助课题
关键词
VBR视频流量预测
尾部概率分布
动态带宽分配
滞回算法
信元丢失率
VBR video traffic prediction, Tail of probablity distribution, Dynamic bandwidth allocation, Hysteresis algorithm, Cell Loss Rate (CLR)
