摘要
无线网络动态的信道特性、高误码率和带宽有限等特点,使得在无线环境下为实时流媒体传输提供QoS保证面临更大的挑战;提出了一种用于无线实时流媒体传输的自适应链路层HARQ控制策略,针对不同的信道状况动态选择混合ARQ方案;该策略采用跨层设计的方法,在应用层采用自适应FEC策略,在视频源数据和冗余数据之间动态分配网络带宽;数学分析和仿真验证表明,该策略能使接收方获得最大的可播放帧率,有效地提高流媒体传输的可靠性和实时性。
The real--time delivery of multimedia data over wireless links with QoS--Guarantee is a big challenge due to the unreliable and dynamic characteristics of wireless networks, limited bandwidth and high QoS requirements for multimedia applications. In this paper, an adaptive link--level Hybrid Automatic Repeat reQuest （ARQ） mechanism was proposed for wireless media streaming, in the hope that the media could be played on receivers with high quality. It allocates the optimal HARQ schemes for different traffic streaming, according to channel condition dynamically. The mechanism, based on cross--layer optimization design, an adaptive FEC at the application layer was used to adjust the sending rate of MPEG video frame adaptively and to allocate the network bandwidth resource between the MPEG video source data and the redundant data dynamically. Both the mathematical analysis and NS simulation results demonstrate that the proposed mechanism can significantly improve quality of media streaming, in terms of playable frame rate, reliability and real--time performance on the reeeiving side.
出处
《计算机测量与控制》
CSCD
北大核心
2010年第3期559-561,564,共4页
Computer Measurement &Control
基金
国家自然科学基金资助项目(60673185)
常熟理工学院教师科研启动基金(KY2009024)
常熟理工学院青年教师科研启动基金项目(QZ0911)
关键词
无线实时流媒体
跨层设计
GM(1
1)模型
区分服务
自适应链路层HARQ
Wireless real--time media streaming~ cross--layer design~ GM （1, 1） ~ differentiated service （DiffServ）
adaptive link--level Hybrid ARQ
