WCDMA无线网络规划的工程探讨

本文主要介绍了WCDMA无线网络规划的特点、流程和方法,以无缝覆盖偏远地区、西部大开发重点城市为目标。利用现网话务路测结果,利用共站、共用天线抱杆、机房、空调风扇恒温系统的方法。既响应国家节能减排政策,又体现了科学规划的合理性设计,进而提高运营商的网络投资效益。     

WCDMA室内覆盖系统规划

1、概述 随着移动通信的普及，建筑物内的话务密度不断上升，室内的话务占总话务的比例越来越高。根据国外WCDMA运营商的统计，70％以上的话务来自室内，且3G带来的特色业务——多媒体业务绝大多数发生在室内。而室内恰恰是网络覆盖的薄弱环节，仅仅依靠室外宏蜂窝基站的覆盖已无法满足容量及通信质量的要求。室内覆盖的建设，     

无线网络规划工具中的3G话务建模

文章对目前业界主流的3G无线网络规划工具中的话务建模方法进行了归纳总结,并以华为的GENEXU-Net工具为例,详细描述具体的建模方法,最后给出了不同运营商的3G话务建模的方法。     

WCDMA无线网络的规划及部署原则

1无线网络规划的基本流程目前,无线网络的规划一般来说包括6个步骤:规划目标的定义、传播模型校正、名义小区规划、站址勘查、无线网络设计及初始网络优化。其中规划目标的定义是整个网络规划的前提,它包括覆盖目标、容量目标和质量目标3个方面。初始网络的覆盖和质量的要求虽然也比较复杂,但根据现有网络经验、实地考察等手段还是可以比较合理地确定。但是容量目标的定义却非常复杂,所谓容量目标的定义也就是话务模型的确定,它要求我们定义网络中需要的业务种类、各种业务需求情况以及各种业务在网络中的行为方式等等。直到目前为止,可以说…     

WCDMA网络规划及部署原则

目前，无线网络规划一般包括6个步骤：规划目标的定义、传播模型校正、名义小区规划、站址勘查、无线网络设计及初始网络优化。     

数据业务急剧增长对GPRS核心网规划建设的影响

依托于GPRS网络的数据业务发展迅速,对GPRS核心网网络冲击很大,传统的扩容模式和扩容理念已经不能满足规划建设要求。本文着重分析了随着话务模型变化GPRS核心网网络的规划、建设应对措施,对GPRS核心网的规划、建设方案制定有一定指导意义。     

WCDMA网络规划实践

一、WCDMA网络规划的流程无线网络的规划就是对站址布局、发射功率、天线方向、扰码等进行预测设计,其中最关键的环节就是基站的物理布局和覆盖范围的预测。而基站布局的确定就与基站覆盖范围紧密相关,这就需要利用无线传播模型进行基站覆盖半径预算。WCDMA网络的技术与业务的复杂性,必然引起规划质量评估的困难,目前采用的是TCP仿真的方式来细调各参数和评估规划的效果。无线网络的规划主要分为以下几个步骤。1.确定网络规划的目标,包括用户和业务需求及覆盖要求。2.收集现网的话务统计数据和无线基站资料,准备覆盖区域的地理类型的…     

GSM无线网络的热点区域专题规划研究

近年来我国各大城市都有大量用于公共设施、重大交通项目和市政设施的建设用地.针对这些区域的网络规划需求,提出了一种利用链路预算和话务预测相结合,综合考虑语音业务与分组数据业务需求的针对未来话务热点的GSM网络规划方法.实践证明,该规划方法对未来话务热点的网络建设有重要的指导意义.     

GSM系统中话务均衡的研究

移动通信在我国已有长足发展，但仍有一些问题值得我们注意，特别是无线信道话务负荷的不均衡表现得尤为突出，本文对此问题首先分析了GSM移动通信系统的话务均衡的概念，然后又具体分析了其在网络规划和优化中的实现方法。     

宏蜂窝覆盖区域的3G话务模型及组网解决方案

基于中兴通讯的工程经验和研究成果,针对宏蜂窝覆盖的不同区域业务特点．分别预测了网络发展中长期的可能的3G话务模型,并提供了相应的组网解决方案。     

自相似网络业务流量的研究与实现

为了准确测试和评估网络交换设备及其调度算法的性能,一个能够真实反映实际网络业务流量特点的业务流量产生系统是十分必要的。近年来通过对大量网络业务流量的测量和分析,人们认识到网络业务流量呈现为长相关、自相似的特性,而非泊松过程。将这一特性和现有的业务流量描述模型相结合,利用具有重尾特性的概率分布函数:Pareto分布和截尾重尾分布,构造了在宏观上表现为自相似特性的业务流量模型。针对路由交换机构调度算法的性能测试的实际需要,建立了一个可用于软件测试的网络业务流量产生系统。     

基于5G 2.6GHz频段的室分系统演进策略研究

5G建设元年已经开始,为节约建设成本,利旧现网室分设备,本文分析了目前室内覆盖的网络现状,研究了现有室分系统面向5G演进的可行性及改造方案,最后以5G价值判断及4G流量需求为场景划分,结合现网各类室内分布系统的特点,给出了面向场景的5G 2.6GHz频段室分系统演进策略。     

基于多维度数据的5G站址选择评估体系

中国移动5G网络采用D频段2.6 GHz频段作为组网的主要频率,为了快速解决现网站址适用于5G网络的有效性问题,基于现有D频段的站址情况和仿真数据,考虑现网4G频段站点的网络结构,结合现网MR数据分布、话务数据分布和其他数据,通过站址选择评估,选择现网站址用于5G网络建设。     

Network architecture and medium access control for deploying third generation (3G) wireless systems over CATV networks

We propose a novel and cost‐effective approach for the deployment of third generation (3G) wireless systems over hybrid fiber coaxial (HFC) CATV networks. The main goal is to facilitate 3G deployment over the existing CATV plant and reduce the large cost required for building a dedicated last mile infrastructure for 3G access networks. Our proposal reduces the last mile cost by sharing the existing CATV network and using the standard equipment and protocols of data‐over‐cable systems interface specifications (DOCSIS). This allows rapid deployment of 3G wireless systems, facilitates convergence of wireless and wireline networks and paves the way towards all IP wireless networks. Enhancements to the DOCSIS medium access control (MAC) protocol must be implemented in order to support Quality of Service (QoS) guarantees for 3G data and signaling traffic. This paper presents the proposed 3G over CATV network architecture and DOCSIS medium access control (MAC) enhancements for enabling the support of QoS guarantees for 3G data and signaling traffic. The proposed MAC enhancements can reduce the access delay for delay‐sensitive traffic by 30 to 40% over existing DOCSIS MAC without compromising QoS guarantees for other traffic classes, or the DOCSIS channel utilization. Copyright © 2004 John Wiley & Sons, Ltd.     

Network heavy traffic modeling using α-stable self-similarprocesses

We propose a new model for network heavy traffic approximation, based on α-stable self-similar processes, namely the skewed linear fractional stable noise. The model demonstrates more flexibility than existing models in fitting different levels of burstiness and correlation in the data. Nonetheless, it is parsimonious in the number of parameters, which have a direct physical meaning. An algorithmic procedure for the estimation of the model parameters is presented, and an asymptotic lower bound of the residual queueing distribution is derived. Extensive simulations are presented, where the new model is fitted to bursty Ethernet data collected at Bellcore (now Telcordia) Laboratories. Furthermore, new measurements of aggregate Web and Webcasting traffic are introduced along with traffic generated by the fitted new model. Queueing simulations of a G/D/1 system confirm our analytical results regarding the tail of the queue distribution     

Key concepts for evolution toward beyond 3G networks

Now, when the first commercial 3G services based on Third Generation Partnership Project (3GPP) specifications have been launched around the world, is the right time to start considering the evolution potential of 3G systems. It is assumed that the majority of the traffic in future mobile networks will be generated by content consumption related services, which are realized with IP technologies. Thus, it is necessary to optimize the cellular networks for carrying IP traffic as efficiently as possible. We describe an evolution scenario for the 3G network architecture specified by 3GPP. The IP delivery part of the network architecture is first optimized within each subsystem, while maintaining interoperability with the legacy network. Later, the network is streamlined as a whole to provide the most efficient solution. We show how graceful evolution of the 3GPP system can benefit from possibilities of the new technologies, especially IP-based transport, while maintaining compatibility with existing user equipment and capitalizing on existing infrastructure investments.     

Spectrum for 5G Services

Wireless Personal Communications - The unprecedented growth in mobile data traffic has choked network capacity of existing IMT/IMT-A (3G/4G) networks. Work on next generation mobile communication...     

A new traffic model for backbone networks and its application to performance analysis

In this paper, we present a new traffic model constructed from a random number of shifting level processes (SLP) aggregated over time, in which the lengths of the active periods of the SLP are of Pareto or truncated Pareto distribution. For both cases, the model has been proved to be asymptotically second‐order self‐similar. However, based on extensive traffic data we collected from a backbone network, we find that the active periods of the constructing SLPs can be approximated better by a truncated Pareto distribution, instead of the Pareto distribution as assumed in existing traffic model constructions. The queueing problem of a single server fed with a traffic described by the model is equivalently converted to a problem with a traffic described by Norros' model. For the tail probability of the queue length distribution, an approximate expression and upper bound have been found in terms of large deviation estimates and are mathematically more tractable than existing results. The effectiveness of the traffic model and performance results are demonstrated by our simulations and experimental studies on a backbone network. Copyright © 2007 John Wiley & Sons, Ltd.     

5G NSA接入专线方案探讨

利用5G大带宽、低时延的网络特性,从现有NSA网络入手,探索利用5G无线网络、核心网、传输网、移动边缘计算实现5G入云专线接入,将专线由传统固定网络接入拓展为5G无线接入方式.基于当前运营商的网络架构,实现了在不同网络层次对专线流量进行解析分流,并通过对比不同方案下专线流量的传输带宽、时延等服务指标,分析了影响业务性能...     

Analysis of a discrete-time single-server queue with bursty inputsfor traffic control in ATM networks

The performance of an asynchronous transfer mode (ATM) network subject to admission control and traffic smoothing is analyzed. Basically, an ATM switch is modeled as a discrete-time single-server queuing system in which a new call joins existing calls. Cell arrivals from a new call are assumed to follow a general distribution. It is also assumed that aggregated arrivals of cells from existing calls form batch arrivals with a general batch size distribution and a geometric distribution of the interarrival times between batches. Both finite- and infinite-buffer cases are considered. An exact analysis yields the waiting time distribution and cell loss probability for a new call and for existing calls. Numerical examples are given to show how the network performance depends on the statistics of a new call (burstiness, time that a call stays in an active or inactive state, etc.) and to demonstrate the effectiveness of admission control and traffic smoothing