一种跨层视频传输QoS控制策略的研究  

Research on control strategy of across-layer QoS about video transmission

作　　者：龙昭华[1] 马艳[1] 张林[1] 杨年鹏[1] 

机构地区：[1]重庆邮电大学计算机系统结构研究所,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2011年第5期580-584,606,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家质检总局公益性行业科研专项经费项目(10-226);"新一代宽带无线移动通信网"国家科技重大专项(2009ZX03004-003-04)~~

摘　　要：分析了通用数据传输服务质量(quality of service,QoS)技术,探讨了实时传输及实时传输控制协议(real-time transport protocol/real-time transport control protocol,RTP/RTCP)、H.264分层编码与码率控制、信道自适应的传输等相关技术在跨层视频传输过程的作用,指出自适应多速率(adaptive multirate auto rate fallback,AMARF)协议的缺陷,提出改进的E-AMARF(Extend-AMARF)协议并进行仿真实验,基于以上技术提出一种跨层视频传输QoS控制策略,并将其应用于本团队自主研发的无线局域网可视电话(WLAN video phone,WVphone)终端上。仿真实验表明,在节点数目不多时,E-AMARF协议相较AMARF协议具有明显的优越性。WVphone终端测试结果显示,添加QoS保障后,WVphone具有实时、高清的效果,说明本跨层视频传输QoS控制策略是有效的。An improved E-AMARF （Extend-AMARF）protocol was proposed in this paper which is based on AMARF proto- col, and a cross-layer QoS control strategy that is in accordance with the requirement of WLAN video phone was used. The control strategy was designed through analyzing the general video transmission QoS technologies, RTP/RTCP real-time transmission and control protocol, H. 264 layered coding and bitrate control, E-AMARF and other related technologies. The simulation results show that E-AMARF protocol has obvious advantages when the number of nodes is few. Meanwhile, by the contrast test, the QoS guaranteed WVphone terminal has real-time, high definition effect. It means this strategy is effective.

关 键 词：无线局域网可视电话 RTP/RTCP协议 视频传输 H.264技术 跨层QoS E—AMARF协议 

分 类 号：TP303[自动化与计算机技术—计算机系统结构] TP393.03[自动化与计算机技术—计算机科学与技术]