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A Study on Enhancement of User-Level QoS by Utilizing Mutually Compensatory Property of Multimedia

利用多媒体互补偿特性增强用户级QoS的研究

基本信息

批准号：
17360179
负责人：
TASAKA Shuji
金额：
$ 10.21万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

This research deals with user-level QoS of audio-video IP transmission. The research results can be classified into the following five categories.1.The first subject is quantitative assessment of user-level QoS. We have studied the effect of monitor size, a scheme of continuous-time assessment and multidimensional assessment.We have also proposed a real-time estimation scheme using video spatial quality and audio-video temporal quality.2.We have investigated how the MAC protocols in IEEE802 11 affect application-level and user-level QoS A method for testing the feasibility of user-level QoS has been proposed for DCF and EDCA with and without media synchronization control. EDCA with TXOP-Bursting was evaluated in error-prone environments. We also proposed a method for user-level QoS guarantee with-HCCA and showed its effectiveness. In addition, we applied DCF and EDCA to ad hoc networks and evaluated QoS3.We have assessed user-level QoS in multipoint -to -multipoint TV conferencing applications with a multidimensional metric as well as a scalar one.4.We have studied a method of enhancing user-level QoS in bandwidth-guaranteed IP networks by utilizing the mutually compensatory property. Under the condition that the total guaranteed bandwidth of the audio-video streams is constant, we clarified how we should allocate the bandwidth between audio and video according to the content type in order to maximize the user-level QoS.5.We have proposed a SIP-based session control method that provides a mechanism to achieve desirable user-level QoS, which is referred to as GPSQ (Guarantee of Psychologically Scaled Quality). We implemented GPSQ in a simple experimental network and confirmed its effectiveness

本文研究IP音视频传输的用户级QoS问题。本文的研究成果可以归纳为以下五个方面：1.用户级QoS的定量评估。我们研究了显示器尺寸的影响，2.研究了IEEE80211中MAC协议对应用层和用户层QoS的影响，提出了一种用户层QoS的可行性测试方法，并给出了一种基于MAC协议的用户层QoS测试方法。已经为具有和不具有媒体同步控制的DCF和EDCA提出了一种级别QoS。在易出错的环境中评估具有TXOP突发的EDCA。我们还提出了一种方法，用户级的QoS保证与HCCA，并显示其有效性。此外，我们将DCF和EDCA应用于ad hoc网络并评估了QoS 3.我们使用多维指标和标量指标评估了多点对多点电视会议应用中的用户级QoS。4.我们研究了一种在带宽保证的IP网络中利用相互补偿特性增强用户级QoS的方法。在音视频流的总保证带宽不变的情况下，阐明了如何根据内容类型在音视频流之间分配带宽以最大化用户级QoS。5.提出了一种基于SIP的会话控制方法，该方法提供了一种实现用户级QoS的机制，称为GPSQ（GuaranteeofPsychologically ScaledQuality）。我们在一个简单的实验网络中实现了GPSQ，并证实了它的有效性