异构家庭网络中基于环境感知的流媒体自适应分发系统  

Context-Aware Adaptive Streaming System for Heterogeneous Home Network

作　　者：倪业鹏[1] 杨成[1] 

机构地区：[1]中国传媒大学

出　　处：《中国传媒大学学报（自然科学版）》2015年第1期26-37,共12页Journal of Communication University of China：Science and Technology

基　　金：国家科技支撑计划项目(2012BAH02B03)

摘　　要：随着无线网络与智能终端的普及,移动流媒体业务量正在逐级攀升。在异构家庭网络中,有线网络的带宽变化、抖动和丢包,无线网络的带宽变化以及多种样式的用户终端,都对可靠QoS保证的流媒体分发带来了很大程度的挑战。在充分考虑上述可能影响流媒体分发的因素后,文章提出了一种基于环境感知的流媒体自适应分发系统,实现了有线网络感知,无线网络感知,终端感知以及策略分析模块,分别感知有线无线网络参数和终端参数,并对现有的流媒体QoS模型进行了优化,最终实现系统基于环境变化的流媒体自适应分发。在论文的测试阶段,笔者设计了12种测试环境分别对系统各个模块和整体性能进行了测试。通过测试结果可知,文章提出的系统可以根据不断变化的用户环境(网络参数和终端性能等)来动态调整服务策略,为用户提供可靠QoS保证的流媒体分发服务。With the popularity of wireless networks and smart terminals, mobile streaming traffic is pro- gressively rising. In a heterogeneous home network, the QoS guarantees streaming is adversely affected by variation of bandwidth, network jitter, packet loss in wire or wireless network and varied user terminals. Considering the influencing factors to streaming which were mentioned above seriously, we propose a con- text - aware adaptive streaming system basing on the awareness of environment. We realized the percep- tion of network parameters and terminal parameters, and optimized the existing streaming QoS model, and ultimately implemented the adaptive streaming system. In our experiment stage, we designed 12 kinds of the testing environment to respectively test each module of the system and the whole system performance. According to the experimental results, the system we proposed can be dynamically adjusted service policy based on variation of user environment （ network parameters and terminal performance parameters, etc）, provide users with reliable QoS guarantees streaming services.

关 键 词：环境感知 流媒体 策略分析 QOS 

分 类 号：TN915.41[电子电信—通信与信息系统]