视频码流流量的实测描述模型  

Empirical Description Model for Packetized Video Traffic

作　　者：王雷[1] 杨朝晖[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《北京邮电大学学报》2005年第3期103-106,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家"863计划"项目(2002AA119010)

摘　　要：以视频码流流量的实测包络为基础,提出了一种流量描述模型.该模型逐一地提取包络切点并将其代表的速率和突发性等特征定义为切点描述;进而,在对各个切点描述进行汇总与筛选后形成了最终的描述结果.由于实测包络是最贴近流量的包络,所以该结果可全面且确定性地表示视频码流的流量特征.另外,还提出了一种简化描述结果的方法,以确保该模型能够在预留带宽的优化等方面得到实际的应用.所提模型既克服了当前常见模型(如令牌漏斗模型等)的缺陷,又具备了与这些模型的兼容性,并从根本上弥补了IntServ体系内保障性业务机制中的缺陷.Based on the empirical envelope of a compressed video stream, a traffic description model was developed. With aid of the model, the data rate and burst features could be denoted by all of the tangent points of the empirical envelope. To make the model more practical in use, an algorithm was proposed to remove the redundancy within the description results. Since the empirical envelope was the only tightest envelope, the traffic features of a compressed video stream could be described completely and uniquely. The drawbacks of the traffic description models used in nowadays network resource management could be resolved with the proposed model. It is also showed how the proposed model can be applied to determine the optimal bandwidth to be reserved when requesting the guaranteed service via RSVP (resource reservation protocol).

关 键 词：视频码流 描述模型 流量 实测 INTSERV 特征定义 简化描述 漏斗模型 包络 切点 突发性 确定性 兼容性 保障性 缺陷 

分 类 号：TN919.81[电子电信—通信与信息系统] TP391.41[电子电信—信息与通信工程]