基于QoE的无线网络视频传输控制方法研究

发布时间：2018-05-17 10:17

本文选题：无线视频 + 用户体验质量　；参考：《南京邮电大学》2014年硕士论文

【摘要】：新一代无线网络的快速发展为无线多媒体传输奠定了网络基础，人们已经开发出了许多无线视频应用。但是在无线网络中接收的视频质量仍不能达到用户对视频质量的要求。终端用户的移动性，无线信道的时变性，以及无线传输的阴影衰落等都会影响视频传输质量。提供高质量的无线视频传输服务，，实时准确地度量接收端视频质量，并通过拥塞控制、速率控制等机制来增强用户的体验质量，是一个迫切需要解决的问题。针对现有方法的不足，本文提出一种基于用户体验质量（QoE）的无线视频传输控制算法。该算法综合考虑有效带宽变化率和丢包率，对网络状况进行判断；接收端定时统计网络的丢包率、有效带宽等QoS参数，并以RTCP包的形式将这些信息反馈给发送端；发送端将接受的丢包率、有效带宽等信息作为QoE预测模型的输入参数，实时计算接收端的QoE值，并根据QoE变化值和当前网络状况，调整发送速率，以提高接收端的用户体验质量。论文的主要工作包括建立仿真环境，研究用户体验质量与丢包率、有效带宽变化率的关系，并据此提出一种根据网络状况模糊控制的算法，在真实网络环境下进行多组实验以验证算法的有效性。实验结果表明本文算法可以有效地改善接收端的用户体验质量。
[Abstract]:The rapid development of the new generation wireless network has laid the network foundation for wireless multimedia transmission, and many wireless video applications have been developed. However, the video quality received in the wireless network still can not meet the user's requirements for video quality. The quality of video transmission is affected by the mobility of the end user, the time-varying of the wireless channel, and the shadow fading of the wireless transmission. It is an urgent problem to provide high-quality wireless video transmission service, to measure the video quality of the receiver accurately and in real time, and to enhance the user's experience quality through congestion control, rate control and other mechanisms. Aiming at the shortcomings of the existing methods, this paper proposes a wireless video transmission control algorithm based on user experience quality (QoS). The algorithm synthetically considers the effective bandwidth change rate and packet loss rate to judge the network condition, the receiver timing statistics the QoS parameters such as the packet loss rate, the effective bandwidth and so on, and feedback the information to the sender in the form of RTCP packet. The sender takes the received packet loss rate, effective bandwidth and other information as the input parameters of the QoE prediction model, calculates the QoE value of the receiver in real time, and adjusts the transmission rate according to the changing value of QoE and the current network condition. To improve the quality of the user experience at the receiving end. The main work of this paper is to establish a simulation environment, to study the relationship between user experience quality and packet loss rate, effective bandwidth change rate, and to propose a fuzzy control algorithm based on network condition. A number of experiments are carried out in real network environment to verify the effectiveness of the algorithm. Experimental results show that the proposed algorithm can effectively improve the user experience quality of the receiver.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.8;TP393.09

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