基于OPNET Modeler的UMTS性能分析仿真平台

随着计算机性能和仿真技术的提高,计算机仿真技术得到越来越广泛的运用.OPNET是一种具有高可靠度的网络建模、设计、仿真和分析工具.文中主要介绍了基于OPNET建立的UMTS仿真平台,并基于该平台研究了UMTS网络典型业务端到端的关键性能参数,以及根据业务服务质量的需求提供不同等级服务的可行性.仿真结果表明,该系统级仿真平台对UMTS系统的性能分析是有效的,为网络的规划设计提供客观、可靠的定量依据.     

UMTS网络中KJAVA业务的OPNET仿真

本文介绍了基于OPNET Modeler10．0平台的UMTS网络建模方法．给出了OPNET进行KJAVA业务网络仿真的具体步骤，并利用OPNET对承载KJAVA业务的UMTS网络进行仿真和对相关网络节点的CPU负荷性能进行测量．为优化网络设计提供了重要的依据。     

浅析UMTS900M技术及应用

随着WCDMA用户的不断增多,用户对WCDMA网络覆盖以及室内深度覆盖提出了更高的要求。针对这种情况,就UMTS应用于900MHz频谱技术进行分析,并结合UMTS900与UMTS2100网络在单室外基站和室内覆盖两种不同场景下的比较实验,明确展现了UMTS900网络应用的优势和布设的必然性。同时结合对UMTS900网络规划中GU共存的三个关键问题的分析,提出了现网改造方案。     

浅析中国联通部署UMTS900带来的挑战

UMTS900相对UMTS2100来说,具有一定的技术优势,本文结合中国联通的网络特点,分析中国联通部署UMTS900会给网络带来怎样的挑战以及规划上的难点。     

UMTS中RNC接口规划研究

UMTS将为未来的信息系统提供业务平台,整个通信界都支持这一发展趋势.技术将不再被看作是问题,而是被看作是业务创新、业务多样化和业务区分的驱动力,UMTS将代表当前大多数移动网络基础设施自然演进的趋势.本文首先建立了UMTS系统的业务模型,分析了UMTS系统设计容量需求,介绍了Iu接口规划方法,最后对RNC吞吐量进行了估计.     

浅析UMTS900M技术及应用

随着WCDMA用户的不断增多,用户对WCDMA网络覆盖以及室内深度覆盖提出了更高的要求。针对这种情况,就UMTS应用于900MHz频谱技术进行分析,并结合UMTS900与UMTS2100网络在单室外基站和室内覆盖两种不同场景下的比较实验,明确展现了UMTS900网络应用的优势和布设的必然性。同时结合对UMTS900网络规划中GU共存的三个关键问题的分析,提出了现网改造方案。     

WCDMA中的软容量和软覆盖规划

本文在简述GSM系统和UMTS系统不同规划特点的基础上,对WCDMA无线网络规划中的软容量和软覆盖问题进行了详细的阐述,并给出了仿真结果.另外对WCDMA系统初始布局阶段容量和覆盖的规划作了详细说明.     

NEC UMTS系统让移动通信随需而定

UMTS作为主要的3G移动通信技术,是对现有移动通信网络的实质性地跃进,它从各种方面满足了不同行业的需求。目前,全球已有上百家移动网络运营商采用WCDMA作为其部署UMTS网络的选择标准。领先的UMTS解决方案作为全球WCDMA技术的领导者,NEC在UMTS技术创新及网络规划方面具有超前的     

面向GSM/UMTS技术的移动通信综合解决方案

以毛里求斯MTML Ⅰ,Ⅱ期为例,介绍面向GSM/UMTS技术的移动通信综合方案。首先较为系统地就MTMLGSM/UMTS全网综合解决方案中涉及到的网络规划、微波传输规划等进行了讨论。之后就GSM/UMTS移动通信系统综合解决方案中,涉及到各专业产品技术方案与网络架构等,进行了较为详细地展开阐述。     

国际动态

北电网络为德国电信建设UMTS网络德国电信的子公司T－MobileInternational年前选择北电网络为其跨越欧洲的第三代（3G）UMTS（通用移动电信系统）网络提供无线因特网基础设施的设备及服务,合同总值总计达到3．2亿美元。根据协议,北电网络将为T－Mobile规划中的UMTS网络部署核心IP网络和部分无线电接入基础设施。北电网络还将为T－Mobile公司实施对UMTS的实地测试,帮助T－Mobile从2002年起推出商用UMTS服务。北电网络的UMTS解决方案包括北电网络为广域无线电覆盖设计的e－mobility因特网基站;主要采用北电网络Passport…     

UMTS radio network planning — maximizing return on investment

This article describes, based on the fundamentals of GSM radio network planning, the process of planning and optimizing UMTS networks. It highlights the key differences to existing 2G technologies and explains why UMTS radio network optimization is so complex that it cannot be done manually any more. This article gives some examples of cost efficient UMTS radio network enhancements in order to maximize future network capacities. It explains how UMTS return on investment is influenced by using advanced methods for radio network planning and optimization.     

Wireless Network Simulation – Your Window on Future Network Performance

The paper describes three relevant perspectives on current wireless simulation practices. In order to obtain the key challenges for future network simulations, the characteristics of “beyond 3G” networks are described, including their impact on simulation.Erik Fledderus (1970) received a PhD in Applied Mathematics in 1997, after which he started working at KPN Research, which merged with TNO in January 2003. He developed the basis for UMTS radio network planning at KPN, and initiated in 2000 a European project proposal, Momentum, in the area of UMTS radio planning and simulation, with 7 partners from Germany and Pottugal. Erik acted as project leader and co-ordinator from 2001-2003. Also at the end of 2000 he initiated together with Eindhoven University of Technology, Agere Systems and Philips Research a research proposal in the area of antenna arrays and MIMO in WLAN and UMTS. One of the results of this project~lies at the basis for the 802.11n-proposal by Agere/Philips.Since March 1st 2003, Erik is part-time professor at Eindhoven University of Technology in the field of Wireless Communication Networks.Within TNO he is senior strategist, program manager of the program Future ICT Architectures, and leading in the knowledge management regarding radio and mobile network technology, and strategist on mobile/wireless technology in general.     

某运营商农村数据业务承载方案建议

针对某运营商EGRPS网络在农村面对的困境和该运营商GSM900技术向UMTS900技术或LTE技术演进的必要性,分析7GSM900技术向UMTS900技术或LTE技术演进的频率规划,最后从覆盖、容量和网络改造三个方面分析了该运营商GSM900技术向UMTS900技术或LTE技术演进对现有GSM900网络影响。UMTS900和LTE允许的下行最大路径损耗比GSM900语音业务允许的最大路径损耗大3～4dB,部署UMTS900或者LTE系统后,可以提供的下行数据吞吐量是原有GSM900系统的4．38—20．18倍。     

Topological planning and design of UMTS mobile networks: a survey

In this paper, we present a literature review on the topological planning problem of third generation (3G) cellular networks based on the universal mobile telecommunications system (UMTS) standard. After describing the UMTS architecture, we introduce each subproblem and present major works that have been done. The cell, the access and the core network planning problems have all been considered as well as a more global approach (when more than one subproblems are considered simultaneously). Both planning and expansion algorithms are also included in this review. The goal of this paper is to present and classify the different research works that have been done so that it can be used as a starting point for future research on topological design of UMTS networks. Copyright © 2008 John Wiley & Sons, Ltd.     

部署UMTS900带来的网优问题探讨

简要介绍了UMTS900技术原理;对中国联通部署UMTS900网络带来的频率规划、干扰、GSM语音业务容量、天馈系统及2G／3G互操作等问题进行了深入研究,并给出了相关优化建议。     

A Study on Differentiated Service Queuing Scheme with an Overflow Buffer Allocation Within a UMTS Core Network

According to the QoS features of the four types of UMTS traffic, this study proposes a priority-based queuing scheme to support differentiated services among all UMTS traffic; it bases on packet transmission priorities of four types of UMTS traffic to handle packets forwarding in a gateway within a UMTS core network. In the proposed queuing scheme, a static dedicated logical queuing buffer allocation and a dynamic overflow buffer allocation are used to support packet enqueuing/dequeuing jobs. In this study, the ns2 network simulator is used as a simulation platform and different categories of simulation scenarios are executed. Moreover, the IETF DiffServ scheme is used as a comparison to understand the packet forwarding performance of the proposed scheme. By analyzing simulation data, two important points can be drawn. The proposed queuing scheme supports a differentiated packet forwarding behavior among four types of UMTS traffic. And, the differentiated packet forwarding behaviors with the proposed queuing scheme are similar to the packet forwarding behavior with the IETF DiffServ scheme.     

UMTS网络商业楼宇无线覆盖方案分析

无线网络覆盖是网络规划工作中的难点和重点,不同的覆盖策略会导致截然不同的网络投资、覆盖效果、工程难度和网络质量,UMTS网络规划也不例外,必须在合理的网络覆盖策略指导下进行.就典型商业楼宇的无线网络覆盖方案进行了分析和探讨,提出了室内覆盖系统的三种方案.     

WCDMA无线系统的规划和优化

本文介绍了WCDMA的空中接口,提出了系统规划的方案,包括覆盖、容量、频率和码子的规划,同时讨论了WCDMA网络性能中关键的优化和监测指标.