基于ATM理念的UTRAN传输架构简析

现阶段,IP传输还无法满足高等级业务的QoS需求,而ATM技术面向连接的良好特性使其在3G传输网建设中得到广泛应用。本文基于ATM结构与IMA技术理念的分析,衍生出针对其在UTRAN内传输网组建中各式应用方案的探讨,以提供对UTRAN传输架构更为清晰的认识。     

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.     

UTRANIP化下传输网建设的探讨

阐述了UTRAN随着无线数据业务应用不断扩大的发展过程、IPUTRAN特点,详细比较了SDH、MSTP和PTN3种IPUTRAN传输网组网方案的优缺点,提出了建设IPUTRAN传输网技术选择的建议。     

基于ATM理念的UTRAN传输架构简析

UTRAN（UMTS无线接入网）系统传输网承载其内部业务传送及至CN（核心网）侧的业务汇聚功能，考虑3G网络内。话音、媒体流及Internet等数据业务的多样性。带宽颗粒度变化较大。原2G系统基于TDM承载方式难以为其提供高效可靠的传输平台。而P承载技术实现及稳定性争论还仅限于CN侧,因此17MTSR99/R4、CDMA2000 1X版均采用了基于ATM架构的接入网传输承载理念     

本地传输网(SDH)网络优化研究

本文先简单介绍本地传输网的概念以及目前传输网的主要特点,然后基于对本地传输网的认识,提出传输网络优化需要考虑的几方面的问题.接着通过对目前国内地传输网的需求和存在问题的分析,提出对传输网优化的必要性和目的.文章中引出了对传输网络优化的问题后,紧跟着明确了传输网络优化的原则,接着对网络优化的实施阶段进行了详细的论述,此部...     

分级支持QoS的3G UMTS无线接入网IP/MPLS传输模型

对实现UMTS系统端到端QoS过程中UTRAN所面临的挑战及可能采用的QoS技术进行了分析,然后结合3GPP UMTS业务规范,提出了一种在UTRAN中基于DiffServ机制分级支持QoS的IP／MPLS传输模型。     

如何建设面向多业务的UTRAN承载网

分析了UTRAN面临的挑战与3GUTRAN传输需求，提出了上海贝尔阿尔卡特的UTRAN承载方案。     

传输网络的安全加固探析

围绕传输网络的安全性对传输网存在的问题进行分析,提出网络安全加固的必要性。通过传输网络结构、传输设备、光缆线路三大要素对传输网的安全加固方法进行探析。     

本地传输网的优化与调整

传输网作为电信网的基础网,承载各类业务,为整个电信网正常运行提供保证,维护好这个网络将有力地提高中国电信的竞争优势.传输网优化调整是传输网建设和维护管理工作的重要组成部分,根据市场需求和维护需要及时对局部传输网络进优化、调整,可进一步提高网络拓扑结构的合理性和传输网络的安全可靠性,有效利用传输资源.介绍广州本地传输网络的组网特点,分析中继和接入传输网存在的问题,并提出传输网络优化调整的思路.     

传输网网络优化分析

本文围绕传输网的四个考量对本地传输网的需求和存在问题进行分析,提出传输网优化的必要性。并以网络结构、传输设备、光缆线路三大要素对本地传输网的优化内容进行探讨,并对网络拓扑、传输设备优化的部分细节问题具体展开。     

3G WCDMA网络共享的关键技术

基于3GPP标准中网络共享的最新研究进展,文章介绍了3G WCDMA网络共享的4种解决方案:站点共享、公共共享网络、地理分割网络共享、无线接入网共享,对Release5中的lu-Flex功能、Release5中连接模式下的UTRAN共享机制和Release6中的网络共享支持增强机制等网络共享的关键技术进行了分析.     

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.     

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.     

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.     

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.     

Traffic and Interference Adaptive Scheduling for Internet Traffic in UMTS

In this paper we propose a scheduling strategy for the radio resources management when transmitting Internet traffic over third-generation systems. More precisely, we consider the UMTS Terrestrial Radio Access Network (UTRAN) Time Division Duplex (TDD) mode standardized by ETSI. UTRAN TDD uses a hybrid solution of code and time division multiple access, called TD-CDMA. In UMTS systems a key issue in developing access methodologies for the available spectrum is an optimal management of the rare radio resources. In this paper we present a fair and efficient scheduling algorithm that adapts its behavior to traffic and interference conditions. Specifically, our scheduling algorithm is able to manage the radio resources taking into account both the traffic fluctuations in the uplink and downlink direction and the variations of the system interference. The goal of our scheduler is the data-throughput maximization for an efficient utilization of available radio resources. The effectiveness of our scheduling algorithm is shown by exploiting analytical tools.     

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。     

Performance study for HARQ–ARQ interaction of LTE

The 3GPP working group proposes the Long‐Term Evolution (LTE) system as the 4G mobile communications technology. To reduce the transmission latency in the radio access network, Evolved Universal Terrestrial Radio Access Network (E‐UTRAN), of LTE, the base station and radio network controller are merged into a single network node, namely eNB. In E‐UTRAN, the Stop‐And‐Wait Hybrid ARQ (SAW‐HARQ) protocol in the Media Access Control (MAC) layer deals with transmission errors without the need to engage the ARQ protocol in the Radio Link Control (RLC) layer. The HARQ and ARQ protocols interact only in case of dealing HARQ residual errors. In this paper, we propose an analytical model to model the behavior of the HARQ–ARQ Interaction. Our analytical model is validated against the simulation experiments that provide more performance metrics (which cannot be obtained through our analytical model). Finally, we investigate the impacts of the HARQ–ARQ Interaction on the Protocol Data Unit (PDU) transmission delay based on our simulation experiments. Copyright © 2009 John Wiley & Sons, Ltd.