3G无线网络性能评价KPI体系研究

本文从UTRAN(UMTS terrestrial radio access network,陆地无线接入网)的技术特征出发,在分析考虑GSM、GPRS无线网络的KPI(key performance indicator,关键性能指标)体系的基础之上,给出了UTRAN的KPI体系的选取原则与方法,提出了UTRAN的KPI体系.     

TD-SCDMA系统中Iub接口流量的探讨

一、Iub接口协议栈及说明 TD-SCDMA接入网(universal terrestrial radio access network,UTRAN)的结构如图1所示.在TD-SCDMA系统中,通用地面无线接入网络部分主要由无线网络控制器、节点Node-B和用户设备(UE)构成.Iub接口位于节点Node-B与无线网络中心(RNC)之间.Uu接口存在于UE与Node-B之间.在2个RNC之间的是Iur接口,传递2个RNC之间的信息.     

第3代移动通信系统的通用无线接入网段的结构

综述了第3代移动通信系统网络结构中的通用无线接入网(UTRAN),介绍了定义UTRAN的原则,UTRAN的结构、功能,UTRAN的接人层,UTRAN的O＆M、同步及接口的通用协议结构.提出了我国第3代移动通信系统应采用的网络结构.     

基于IP的UTRAN关键技术及其研究进展

文章简述UTRAN的基本结构和协议栈功能,主要讨论3GPP提出的基于IP的UTRAN解决方案,重点研究用户面解决方案、服务质量、无线信令承载、IP传送和路由结构、向后兼容等,并指出这些技术的研究进展和待解决的问题。     

3G接入传输网络建设分析

3G由核心网(CN)、UMTS陆地无线接入网(UTRAN)、用户设备(UE)三大部分组成。UTRAN分为无线不相关和无线相关两部分,前者完成与CN的接口,实现向用户提供QoS保证的信息处理和传送以及用户和网络之间的控制信息的处理和传送;后者处理与UE的无线接入(用户信息传送、无线信道控制、资源管理等)。UE主要完成无线接入、信息处理等。UTRAN可使用ATM和IP两种传送方式,基于ATM的UTRAN标准较成熟,相关产品已进入试用阶段;基于IP的UTRAN具有网络资源利用率高、节省运营成本、满足Internet和内联网的广泛使用、IP设备联网成本低、符…     

LTE移动性管理研究

移动性是指对于用户或终端位置的改变而持续接入服务、继续通信的能力。LTE(长期演进)无线网络的目标是提供无缝移动性,同时确保网络管理简单易行。文章研究了空闲模式下的移动性管理方法,给出了LTE内部切换应遵循的原则,描述了系统间切换过程,分析了E-UTRAN(演进通用地面无线接入网络)与UTRAN(通用地面无线接入网络)移动性的区别。     

基于GR47模块的电力远程无线抄表系统设计

通过中国移动的通用无线分组业务(general packet radio service,GPRS)网络和Internet网络为通道,可实现电力系统的远程数据采集和传输.介绍了基于GPRS技术的远程电能抄表系统的结构和工作原理,提出了一种基于Sony Ericsson Communication 公司GR47模块和Winbond公司W77E58单片机的远程电能抄表系统,从系统的硬件结构和软件设计两方面分析了该系统的实现方案.实际运行表明,该系统通信可靠,实时性好.     

第三代移动通信技术讲座第四章欧洲提出的W-CDMA(上)--IMT-2000无线传输候选技术之三

无线接入网络结构及其基本原理,UTRAN(UMTS陆地无线接入网络)的逻辑结构和功能,UTRAN接口,无线接口结构及协议,Iu接口及协议,无线接口协议结构,L1(第一层)物理层,L2层数据链路层,L3层网络层.L1 层的说明--传输信道和物理信道,复用、信道编码和交织,扩谱和调制,无线的发送和接收,增加性能和任选.UTRA(UMTS陆地无线接入)和GSM之间的切换.     

UTRAN系统中LCS的实现方法

介绍LCS和UMTS网络架构的基础上,分析了LCS在无线接入网UTRAN系统中的结构,并探讨了UTRAN的定位过程和定位方法.     

下一代3GPP系统话音呼叫切换机制（上）

演进的3GPP（第三代合作伙伴计划）系统是支持若干无线电接入技术和若干移动机制的混合移动网络结构。本文简要回顾该系统的结构及其关键组成,重点强调若干部署情形中支持话音呼叫移动性的方法。首先介绍称之为单模无线电话音呼叫连续性的机制,该机制能使从E-UTRAN（演进的通用移动电信系统陆地无线接入网）接入到遗留的UTRAN/GERAN（通用移动电信系统陆地无线接入网/增强数据率的全球移动通信系统演进无线接入网）或1xRTT的VoIP呼叫进行中间呼叫切换。然后着重描述不支持E-UTRAN上话音服务的部署情形,并介绍称为回落原地的机制,该机制能在话音呼叫的开始从E-UTRAN到UTRAN/GERAN或1xRTT进行切换。最后介绍由IP多媒体子系统实现的应用层话音呼叫切换机制。本文的结论是,下一代3GPP系统是高度完善的移动通信系统,它支持广泛的话音呼叫移动性机制,并能满足所有的商业部署需要。     

Mobility management: from GPRS to UMTS

This paper describes mobility management for the third‐generation mobile networks. We focus on the evolution from General Packet Radio Service (GPRS) to Universal Mobile Telecommunication System (UMTS). In this evolution, the radio access network UTRAN has been introduced, and radio‐related management is moved from the core network to UTRAN. We elaborate on how this architecture change affects the mobility management functionality, including the attach and detach procedures, location update, serving radio network controller relocation and intersystem change between GPRS and UMTS. Copyright © 2001 John Wiley & Sons, Ltd.     

一种新型的3G演进网络架构方案

本文介绍了3GPP Long Term Evolution(LTE)网络架构的最新研究进展,从控制面和用户面功能分离的角度阐述了分布式网络结构的优点,并结合LTE接入网的功能划分提出了一种新型的3G演进网络架构方案.     

3G无线接入网IP化传送承载方案的研究

本文针对3GPP R5版本后无线接入网(UTRAN)在选择IP化发展背景下对传输承载网络的新需求,分析了RNC和NodeB接口的使用方法和传送承载方式,剖析了3G无线接入网IP化的关键技术,主要研究了基于城域传送网和城域数据网的各种传输承载方案和部署建议.     

浅析IP-UTRAN的演进

第三代移动通信网的发展趋势将是基于全IP的,本文重点分析了IP－UTRAN的演进趋势,并对其中涉及的IP版本选择、空中接口和传输网络层等相关问题进行了讨论。     

Performance analysis for UMTS networks with queued radio access bearers

The Universal Mobile Telecommunications System (UMTS) network consists of a core network (CN) and a UMTS terrestrial radio access network (UTRAN). The UTRAN offers radio access bearer (RAB) services between the user equipment (UE) and the CN to support mobile multimedia applications with different quality of service (QoS) requirements. Depending on the requested QoS, different types of RABs can be established at the request of the CN. The UTRAN then has to establish and maintain the RAB with the requested QoS. We study the queueing of RABs as a means for improving the bandwidth utilization while minimizing the RAB blocking probability. We develop an analytical model to study the performance for UTRAN with queued RABs in terms of RAB blocking probability and average queueing time of queued RABs. From an analytic point of view, the main contribution of this paper is the introduction of a novel recursion for the computation of the performance measures.     

Standardization of femtocells in 3GPP - [femtocell wireless communications]

Cellular system operators have identified the critical need for standardization of femtocell devices and their associated interfaces into the operators' core networks as a critical requirement for the success of femtocell products. Driven by this demand, the UMTS/UTRAN standards community has been undertaking a large-scale and comprehensive effort to specify such standards for femtocell devices and systems that are based on the UMTS/HSDPA/HSUPA family of radio access technologies. This article describes those standardization activities and provides an overview for the femtocell system architecture that has been developed within 3GPP.     

WLAN分流技术在智能管道中的应用

文章认为由于智能终端和移动互联网的发展给移动网络带来巨大压力,因此为移动用户提供无线局域网(WLAN)接入成为移动网络数据业务分流的重要手段。基于WLAN分流技术,文章分析了用于解决WLAN和移动网络业务连续性问题的新技术,如全球移动通信系统增强数据传输速率技术无线接入网络/陆地无线接入网/通用移动通信系统陆地无线接入网/陆地无线接入网/增强通用移动通信系统陆地无线接入网(GERAN/UTRAN/E-UTRAN)与WLAN网络之间的业务连续性技术、接入网络发现和选择功能和非无缝的WLAN分流技术。     

Enhanced VoIP Support in OFDMA-based Packet Radio Networks

As the first OFDMA-based cellular packet radio network, Evolved UTRAN has already been well studied in 3GPP and semi-persistent scheduling was selected as the most relevant packet scheduling scheme for VoIP traffic. With further evolution of Evolved UTRAN to meet the ambitious goal set by IMT-A, the performance of VoIP needs to be enhanced. In this article, we establish a semi-persistent scheduling centered framework for efficient VoIP support in OFDMA-based packet radio network and evaluate different enhancement methods, such as adaptive transmission bandwidth in persistent resource allocation, dynamic packet bundling, and frequency diversity transmission that can be added into this framework. In addition, we investigate practical constraints, e.g. wideband CQI reporting on real network performance as well as possible corrective measures. The whole system design is verified through large-scale network level simulations in which all the details of various VoIP-specific radio resource management algorithms and enhancement mechanisms as well as interactions between them are explicitly modeled. Simulation results indicate that VoIP in Evolved UTRAN can be well supported using this framework and further improved through different enhancement methods. Compared with fixed transmission bandwidth approach, adaptive transmission bandwidth approach can provide additional capacity gain of 11 and 8% respectively in 3GPP Macro Case 1 and Case 3 deployment scenario. In a highly-loaded network, switching from adaptive transmission bandwidth to dynamic packet bundling can accommodate 18 and 15% more users in Case 1 and 3 respectively. The performance degradation due to wideband CQI reporting can be partly compensated with frequency diversity transmission. It is finally concluded that the enhanced performance of VoIP is sufficient to meet the ambitious target set by IMT-A in all four ITU deployment scenarios.     

Network-based mobility management in the evolved 3GPP core network

A key aspect of the 3GPP system architecture evolution is the specification of an evolved packet core that supports multiple access networks. The EPC enables operators to deploy and operate one common packet core network for 3GPP radio accesses (E-UTRAN, UTRAN, and GERAN), as well as other wireless and wireline access networks (e.g., eHRPD, WLAN, WIMAX, and DSL/Cable), providing the operator with a common set of services and capabilities across the networks. A key requirement of the EPC is to provide seamless mobility at the IP layer as the user moves within and between accesses. This article provides an overview of the EPC specifications that use a network-based mobility mechanism based on Proxy Mobile IPv6 to enable mobility between access networks. An important facet of providing seamless mobility for a user?s sessions across technologies is to ensure that quality of service is maintained as the user moves between accesses. An overview of the ?off-path? QoS model to supplement PMIPv6 is also provided.     

Managing IP traffic in radio access networks of next-generation mobile systems

The strong research, standardization, and development activity currently focusing on the enabling technologies for the transition to a new generation of mobile networks represent a great opportunity to accomplish the goal of IP multimedia service provisioning to mobile users. This will contribute to the migration toward an all-IP platform with guaranteed end-to-end QoS provisioning, and will definitively fuel the deployment of new multimedia mobile applications and the further development of multimedia ubiquitous communications. This objective is not easily achievable, mainly due to the difficulties in handling IP multimedia applications in a mobile environment with a guaranteed QoS level. To contribute to this issue, in this article we discuss an evolutionary scenario from the current UMTS system to a next-generation QoS-aware mobile platform based on IP as the transport solution in the radio access network, UTRAN. Furthermore, we propose to fit the IntServ-over-DiffServ approach, in order to best manage the QoS level inside the UTRAN.