基于UTMS流媒体框架下的QoS技术研究

分析了UMTS流媒体业务QoS特性并研究了UTMS框架下如何建立端到端传输QoS保证确保业务的流畅度。并展望了QoS研究领域的发展方向,即以QoE(体验质量)来对QoS进行监测和优化。     

GPRS与UMTS系统网络接入安全机制的比较与研究

详细介绍了GPRS与UMTS系统的网络接入安全机制，分析了GPRS系统中存在的安全漏洞及UMTS较GPRS在网络接入安全性方面的改善，最后分析了UMTS系统中存在的安全缺陷。     

移动IPv6中QoS的实现

现有的网络服务质量(QoS)有两大模型:集成服务(Intserv)和区分服务(D iffserv)。这两种服务都是针对静态环境(固定主机和固定路由)设计的,对于移动通信网络都不能完全适用。本文结合集成服务和区分服务的优点,提出了一种新的双平面的三重QoS体系,并描述了这一体系对端到端QoS的实现。最后通过实例概述了QoS体系的整体流程,扩展了移动IPv6(M IPv6)信令中的绑定升级(BU)、绑定请求(BR)、绑定确认(BA)三个选项。     

LTE与UTRAN的切换安全问题探讨

以LTE与UTRAN间的切换安全问题为研究对象，深入探讨分析了LTE和UT—RAN切换中的安全机制，最后对切换中的随机数传输过程做了改进，增强了随机数传输的安全性。     

分组域核心网的动态QoS机制浅析

QoS差异化是一种对用户和业务分类，并进行不同的处理和监控的方法。诺西的动态QoS控制机制，业务带宽管理和基于业务的QoS方案，提供了很好控制手段。可以灵活地对不同业务进行不同Qos设定，进行带宽的限制。     

Ad Hoc网络的QoS路由协议研究

QoS路由在实现QoS保证中具有很重要的作用.本文分析设计和实施QoS路由的目标及策略,总结了几种典型的QoS路由,并对这些QoS路由进行经优缺点分析及性能比较.     

GSM向3G演进系统安全的改进

介绍了GSM向3G过渡时期GSM用户的认证与密钥协商过程，分析了GSM用户对3G系统的安全威胁，并对GSM用户接入3G系统提出了改进认证与加密算法。它可以有效防止攻击者假冒合法GSM用户滥用UTRAN网络资源，并可以保证用户的通信安全。     

ASON网络的应用及技术概述

ASON自21世纪初诞生以来,代表了光网络技术发展的趋势.由于其能够解决带宽快速部署、端到端配置和保护/恢复等问题,提供QoS/SLA和分布式的网络控制能力,从而成为光网发展的宠儿.近几年,随着WDM/OTN网络对智能需求的运渐明晰.ASON已从传统的SDH领域扩展至WDM/OTN领域,并在商用上掀起一波新的应用热潮.     

基于IP的3G服务质量控制及实现

第三代移动通信系统 (3G)的第二阶段是采用IP传送网 ,服务质量 (QoS)是极其重要的问题。在讨论基于IP的 3G中QoS体系结构、业务QoS要求基础上 ,重点研究QoS控制原理和区分服务的实现 ,并得出一些有参考价值的结论。     

第三代移动通信系统中用户移动性模型的研究

本文在研究第三代移动通信系统特点和分析UMTS标准模型与可扩展模型的优缺点的基础上，建立了适用于第三代移动通信系统的综合模型，研究和分析了不同类型用户情况下该综合模型的信道占用时间，并给出了仿真结果。     

IP-RAN中一种新的移动性管理框架

RAN的全IP化是UMTS实现全IP架构过程的一部分。在RAN中,最重要的功能之一就是移动性管理。原有的基于ATM的移动性管理技术在全IP的RAN架构中并不适用。在分析全IP的RAN架构中对移动性管理的新的要求基础上,提出了结合MPLS技术和移动IP技术来解决移动性管理的新的开放的应用架构,并且描述了在这种应用架构下移动IP的协议过程;简要分析了这种应用架构带来的好处,提出还需要改进的地方和实现的技术难点。     

Strategic investment analysis for migration beyond 3G wireless networks

This paper analyzes investment alternatives for cellular operators who deploy either universal mobile telecommunications systems (UMTS) with high speed data packet access (HSDPA) networks or UMTS with Wi-Fi networks, for moving beyond 3G-networks. The evaluated business scenarios focus on two different deployment alternatives: UMTS with HSDPA and UMTS integrated with Wi-Fi. HSDPA deployment targets the overlay on the existing UMTS cells, whereas Wi-Fi covers only indoor hot spot areas where data demand is high. Capital investments and operational costs as well as revenue streams have been analyzed for the two types of network architectures. Techno-economic methodologies have been applied for this study and results are derived that are presented and discussed for two types of wireless networks.     

Achieving low-cost UMTS networks via pricing

One of the main concerns of mobile operators towards deployment of Universal Mobile Telecommunications System (UMTS) networks is the investment cost. The costly radio access network, based on the network equipment required in a service area, prevents incumbents and new entrants from upgrading or building a new UMTS network. In this article, a novel, low-cost approach to the UMTS radio access network design is proposed. The approach employs the use of pricing incentives. This approach is based on the assumption that a pricing mechanism is in place to control excessive traffic load during peak periods. By incorporating this assumption into the network design, the network designer is able to relax certain design parameters, which may contribute to significant savings in equipment cost. Investigation is focused on the UMTS coverage and capacity planning, using the Net Present Value (NPV) financial analysis. For certain price-sensitivity levels, the analysis indicates that this approach provides a suitable strategy for mobile operators to comfortably move forward with UMTS upgrade and gain competitive edge in the wireless market.     

Techno-economic evaluation of 3G and beyond mobile business alternatives

Three business case scenarios in the context of emerging mobile access network technologies and business players have been studied and the economical results are presented. The aim is to cover some of the most interesting business alternatives in providing the new 3G and beyond services including cases where the operator may have an existing second-generation cellular network or not, and a license for the 3G UMTS network or not. The scenarios have been analyzed in different Western European country groups that are not exactly representative of any defined country, but rather share typical demographic characteristics. Investments and operational expenditures are identified and the results show how diverse business models and technologies lead to different revenue, cost, and profitability profiles. The business case scenarios include incumbent’s 3G evolution with UMTS compared to an alternative 3G technology deployment with mobile WiMAX, new entrant’s UMTS deployment business case, and a greenfield CDMA450 deployment business case.     

一种基于LTE业务特征的调度算法切换系统

针对LTE业务QoS特征多样化且应考虑业务付费等级的问题,提出了一种改进的比例公平 调度算法。新算法引入不同业务的各QoS指标、付费等级作为参数,并根据各业务的具体QoS 需求在各参数的不同加权配置下切换。仿真结果表明,新算法不但可以极大提高付费业务 的各项QoS指标,还能让所有业务的QoS指标达到既定需求,更好地适应了LTE网络规划的要 求。