WCDMA CN标准发展研究

本文介绍了3GPP在核心网标准工作中的新进展，并分别从QoS、IMS、LCS、MMS、网络共享、IP核心网融合等方面具体阐述了以3GPP为代表的标准化组织在技术标准中的研究现状和工作进展，全文侧重于反映WCDMA Release4和Release5阶段的标准工作进展，对Release99和Release6的标准工作仅作为较依据提出。     

5G无线网共享建设方案

随着5G网络的商用和大规模部署,5G设备单站成本高、站址需求大、功耗高等问题成为运营商5G网络建设和运营中的巨大挑战。在国家网络强国战略和提速降费的要求下,运营商需要探索新的网络建设和运营模式,在保障5G网络高质量建设的基础上提升5G网络的效益和资产运行效率,网络共建共享模式成为电信运营商5G运营新模式。从网络共享技术方案分析入手,分析了异网漫游和接入网络共享技术方案,结合中国联通和中国电信5G网络共享,分析了接入网共享下NSA网络共享方案和SA演进方案。     

3G网络共享技术与运用策略建议

文章首先回顾了国外通信设施共享的历史，对3G网络共享原因进行了简单总结；然后对比分析了几种典型的3G网络共享技术方案；并在描述国外3G网络的共享现状基础上分析其网络共享的具体实现；最后，对3G网络共享在我国运用面临的问题进行了分析，提出了3G网络共享的一些策略建议。     

精品HSDPA解决方案

随着话音业务的增长日趋稳定,移动运营商都把业务增长点寄托在数据业务的发展上。为了满足高速率数据业务日益增长的需求,3GPP在UMTS的Release5中引入了高速下行分组接入解决方案——HSDPA(HighSpeedDownlinkPacketAccess),它可以使下行速率达到14.4M b p s,也是W C D M A移动运营商进行大流量移动多媒体服务的首选技术。与UMTS的Release99和Release4技术相比,HSDPA在下行链路上,采用了新的面向分组数据业务的共享传输信道(HS-DSCH),以及一整套有助于提高频谱效率的机制,如动态自适应编码与调制、快速调度与自动重传等;HS…     

5G网络共享场景下的切片设计流程研究

面对5G频率高、基站密、耗电多、投资大等难题,网络共享成为破局利器之一,业界也在不断推动5G网络的共享。网络切片和共享理念在一些方面不谋而合,因此在5G网络共享的过程中,网络切片的部署也将基于共建共享的模式开展,最大限度地保障业务的服务质量,为千行百业赋能,同时减少网络设备的建设成本,进一步提高运营商网络资源利用率。重点研究5G网络共享场景下端到端切片需求、设计流程及网络架构,探讨共享场景下部署和应用网络切片需要关注的重点方向。     

SMB与NBT共享机制探讨

Windows共享一直是网络共享中探讨的焦点和热点问题,这是因为它在给众多用户带来共享方便的同时,也给我们带来了很多的困惑,比如为什么会有两种共享机制存在呢？一般用户应该如何取含两种共享机制？两种共享机制并存是如何工作的？带着这些疑惑,我以两台电脑为实例,进行了比较详尽的分析。     

NR覆盖增强方案及标准化进展

为提升5GNR网络的覆盖性能,研究并讨论覆盖瓶颈信道的相关覆盖增强方案,包括物理上行共享信道的重复传输增强、多时隙传输块处理、联合信道估计方案,物理上行控制信道的动态重复传输指示、解调参考信号绑定方案,以及随机接入中的Msg3信道的重复传输方案.基于上述增强方案,聚焦3GPP Release 17 NR覆盖增强的标准化...     

负载感知的低开销网络保护机制研究

为提高资源利用率和降低网络阻塞率,提出一种应用于光网络中带有负载感知(LA)的低开销保护机制,充分考虑了网络共享风险链路组(SRLG)的约束条件,建立整数线性规划(ILD)模型对共享通道保护策略与LA技术进行联合优化。仿真表明,与传统机制相比,所提出的机制能够有效地降低网络阻塞以及保护开销,使网络中的流量更加均衡。     

网络映射光盘镜像服务器的实现与性能评测

针对目前应用中的光盘数据库网络共享方案的特点,分析了网络光盘数据库模型,并对网络映射技术进行了研究,提出了利用网络映射技术改进光盘镜像服务器、实现数据库光盘网络共享的新方案,测试结果表明,此方案解决了文件系统的相互访问支持问题,对该服务器的数据访问速度大大高于对共享光驱中数据的访问速度,同时其响应速度相当于光盘镜像服务器。     

HSPA技术演进及商用进展

随着用户对大流量移动多媒体服务需求的日益提高,3GPP组织制定了相应的技术演进路线,在Release 5中引入了高速下行分组接入（HSDPA,High Speed Downlink Packet Access）,在Release6中引入了高速上行分组接入（HSUPA,High Speed Uplink Packet Access）,Release7中采用了OFDM和MIMO技术完成HSDPA和HSUPA的未来演进道路HSPA＋。     

WCDMA传输网络建设方案

随着中国3G的脚步声日益临近,几乎所有运营商都在开始规划即将建设的3G网络,3G网络的规划主要包括无线网络、核心网络和承载网络3个部分,其中承载网包括IP承载网以及传统的传输网,本文主要侧重于传输网,同时由于3G与2G的主要区别在UTRAN,因此本文将侧重探讨服务于WCDMA网络UTRAN部分的传输网建设方案.     

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.     

UTRAN系统传输架构简析

UTRAN系统传输网在R4版阶段将基于ATM理念构建.文章针对UTRAN内传输网组建中各式应用方案进行探讨,以提供对UTRAN传输架构更为清晰的认识,同时对未来传输组网的IP化趋势进行了展望.     

Impacts of air interface admission control and user mobility on UTRAN transport simulations

UMTS Terrestrial Radio Access Network (UTRAN) Transport Network Layer dimensioning has been of great interest among network researchers and planners due to the limit of Iub bandwidth. This paper investigates the potential impacts caused by Connection Admission Control (CAC) mechanism of the air interface and User Mobility (UM) on simulations carried out for the UTRAN transport network domain. Independent from the TNL CAC mechanism of the transport network which is in charge of Iub link bandwidth, the Radio CAC function deals with the highly non-linear resources needed for an attempted connection depending on its specific propagation and interference situation. The consideration of the air interface acting as bottleneck results into a less challenging amount of traffic for the transport domain. In addition, mobile user behaviors, e.g. UM, may dynamically change traffic load at the air interface, and in consequence affect Iub load, which has a very close correlation with cell load. In this work, a simulation model with Radio CAC mechanism and Handover strategies is implemented to study this correlation, and evaluate the UTRAN transport network performance given a limited radio capacity. The analysis on the impacts of the Radio CAC and UM are derived from qualitative simulations.     

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.     

Is multiuser detection beneficial to mixed service UMTS networks?

The main objective of this paper is to investigate linear multiuser detection for the uplink of present mixed service UMTS Terrestrial Radio Access Network (UTRAN) Frequency Division Duplex (FDD) networks in terms of system capacity, system coverage as well as power reduction. For the system performance assessments we apply a two-stage power control multiuser detection algorithm where the users are detected by a multiuser block detection. We evaluate the UTRAN FDD load control parameter noise rise and show corresponding system capacity bounds for different service mixes carried over dedicated channels with data rates up to 64 kbit/s. Note that for typical UTRAN FDD services the signal-to-noise operating points of a multiuser detector are very low (less than 0 dB). These low signal-to-interference-plus-noise ratios (SINR) operating points severely limit multiuser detection performance gains. Compared to single-user-matched filtering the minimum mean square error (MMSE) detector leads to fairly modest system capacity gains up to 60% dependent on the service mix assumed while the decorrelator is even worse. With respect to coverage as well as mobile station power, MMSE detection indicates fair to high improvements.     

Cost analysis and efficient radio bearer selection for multicasting over UMTS

Along with the widespread deployment of the Third Generation (3G) cellular networks, the fast‐improving capabilities of the mobile devices, content, and service providers are increasingly interested in supporting multicast communications over wireless networks and in particular over Universal Mobile Telecommunications System (UMTS). To this direction, the Third Generation Partnership Project (3GPP) is currently standardizing the Multimedia Broadcast/Multicast Service (MBMS) framework of UMTS. In this paper, we present an overview of the MBMS multicast mode of UMTS. We analytically present the multicast mode of the MBMS and analyze its performance in terms of packet delivery cost under various network topologies, cell types, and multicast users' distributions. Furthermore, for the evaluation of the scheme, we consider different transport channels for the transmission of the multicast data over the UMTS Terrestrial Radio‐Access Network (UTRAN) interfaces. Finally, we propose a scheme for the efficient radio bearer selection that minimizes total packet delivery cost. Copyright © 2008 John Wiley & Sons, Ltd.     

A Real Time Emulator Demonstrating Advanced Resource Management Solutions

The E2R-II prototyping environment, as part of the E2R-II project, is a framework that pretends to demonstrate the most promising radio resource management proposals that are developed within the project. Such demonstrations have been based on a dedicated proof-of-concept environment, which serves for validating the work in the areas of cognitive networks, reconfigurable terminals, enhanced radio resource and spectrum efficiency, and dynamic and robust reconfigurations. In this framework, this paper presents a real time demonstrator running IP-based applications for the validation of ASM/JRRM algorithms. Such a demonstrator tries to reproduce in a realistic way a B3G heterogeneous radio access network, which considers different RATs (UTRAN, GERAN, WLAN), interfacing a common Core Network. This demonstrator serves for testing the ASM/JRRM strategies that are proposed within the E2R project. In addition, the E2R ASM/JRRM demonstrator incorporates the capacity to evaluate the QoS experienced by the user when using real applications under controlled conditions of the used RAT and the CN.     

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.