Cognition Flow in Cognitive Radio Networks

This paper introduces the research progress on the cognition flow in the National Basic Research Program of China （973 Program） under Grant No. 2009CB320400 ＂Research on Basic Theories and Key Technologies of Cognitive Radio Networks＂. We present the motivation behind the proposal of the concept of cognition flow, provide the definition, discuss the features, behaviours, representations, math- ematical models, and the functions of cognition flow in Cognitive Radio Networks （CRNs）. We also analyse how the cognition flow promotes the convergence of heterogeneous networks. Our group also constructed the test platform to verify the usefulness of cognition flow. The results that were simulated by computers and tested on the platform both confirm that cognition flow can realise efficient interaction of cognitive information among heterogeneous networks in CRNs, which contributes to the seamless convergence of heterogeneous networks, and significantly improves the spectrum efficiency and users＇ Quality of Experience （QoE）.     

QoE领域新进展及其在最小化路测（MDT）方面的新应用

用户体验质量（QoE）是重要的网络评价指标。文章首先讨论面向用户感受的网络质量评价的一些技术挑战：其次介绍QoE领域的数项最新进展,包括3G网络典型业务视频及多媒体QoE技术的科研进展及标准化进展,QoE指标体系研究的进展等;最后提出一种创新的面向QoE的MDT模式,以期推动QoE及网络建设,优化技术的发展。     

Quantitative and qualitative research on service quality evaluation system in NGN

With the development of next generation network (NGN), reasonable service quality evaluation is essential in network management. Based on NGN service characteristics, this article presents a comprehensive service quality evaluation system from two perspectives: quantitative and qualitative. From the quantitative point of view, this article brings forward the normalized service level achievement function (NSLA function) at technical layer. Also, with mean opinion score (MOS) mode, it proposes customer satisfaction assessment methods at customer perception layer. From the qualitative perspective, a hierarchical model is established, which forms mapping relations from the upper customer perception to the lower service quality parameters, and then the influence of different service parameters on customer satisfaction degree can be denoted by the fuzzy analysis hierarchy process (FAHP) algorithm. Quantitative and qualitative evaluations together form a comprehensive solution which is universal, customer-oriented and flexible. Demonstrated by the representative voice service, the proposed system is proved reliable and applicable to service evaluation in NGN.     

IPTV服务质量关键技术研究

IPTV服务质量直接影响用户的体验,是IPTV得以运营的关键技术之一。目前国内外致力于提高服务质量的技术研究,尚未形成标准。本文结合QoS和QoE分析IPTV服务质量的关键技术,从区分服务模型、MDI和基于IPv6的频道切换技术的角度提出改进IPTV服务质量的方案。     

IXIA EPC测试解决方案

详细介绍了EPC测试挑战和IXIAEPC测试解决方案。主要测试包括LTE网络测试、UMTS和IMS测试、用真实的用户模型测试性能。     

基于QoE综合评估的WCDMA网络质量投诉处理

在分析目前WCDMA用户网络质量投诉类型、投诉处理现状及存在问题的基础上,引入了QoE评估概念;详细阐述了QoE主/客观评价方法及移动网络指标和QoE间的关联性、QoE综合评估模型的设计思路、QoE主观评估综合使用、STE/TTE的引入、QoE综合评估模型运行步骤及应用QoE综合评估模型时应注意的有关问题。     

基于QoE评估的移动互联网优化策略研究

通过研究移动互联网中的QoE体系和评估方法,确定业务与网络之间的互相影响关系并建立统一优化模型,为进行移动互联网中业务与网络协同、提升用户体验奠定了基础。     

HSDPA系统中一种感知用户终端缓存状态的QoE保障调度算法

针对HSDPA系统中现有调度算法无法满足实时业务QoE的缺点,提出一种保障实时业务QoE的调度算法。该算法根据用户反馈的信道质量信息和在基站获取到的用户终端缓存状况信息。确定用户的优先级并据此调度优先级最高的用户,进而保证实时业务的吞吐量和QoE需求。仿真结果表明,与轮询调度算法、比例公平调度算法相比,提出的调度算法不仅能够保证实时业务的QoE需求,而且能满足非实时业务基本的吞吐量需求。     

基于人工神经网络的3G业务QoE评估方法

通过对3G移动通信业务特点和用户体验QoE主要特性的分析,并结合人工神经网络算法的建模优势,提出了一种智能化的QoE评价方法。