WLAN网络建设与特殊场景应用研究

文章概述了无线城市和WLAN，着重研究了WLAN分场景组网方案，包括分布系统合路、室内放装、室外布放和WOC／EOC及PLC等建设方式；分析7WLAN特殊场景建设方式，包括WLAN基站建设覆盖、CPE深度覆盖补充和WLANMesh组网等建设方式。     

小区WLAN无线接入方案

一、引文 过去无线局域网技术（WLAN）通常被用于室内的热点覆盖,随着人们对无线接入范围的不断扩大以及室内区域无线接入系统的完成,室外区域成了无线接入新的热点。由于室内外环境差异及覆盖要求的改变,室内无线接入的经验难以适用于室外小区,本文将介绍几种适用室外无线热点WLAN覆盖的无线接入方案,并说明各方案的特点及使用场景。     

TD-LTE与WLAN共建共存关键技术分析

TD-LTE与WLAN系统均为无线宽带通信技术的发展提供了强大助力,但由于两个系统的部分工作频段较为接近,共建共存时必须处理好其干扰控制问题。文章基于理论研究与大量工程实践经验,针对室外和室内不同的建设场景,重点分析了TD-LTE与WLAN系统共建共存时的干扰控制方法,为网络的规划优化等实践工作提供参考和指导,有助于提升网络质量。     

WLAN无线信号室外覆盖预测和分析

由于室内外的环境有差异,WLAN室外网络建设不能照搬室内的建设方法。在对现有室外站点的覆盖效果进行大量测试后,得到WLAN信号覆盖电平及质量,并选取合适的传播模型,计算WLAN室外站点的覆盖距离。最后,针对不同室外场景提出了建设和优化意见。     

WLAN无线信号室外覆盖预测和分析

由于室内外的环境有差异,WLAN室外网络建设不能照搬室内的建设方法。在对现有室外站点的覆盖效果进行大量测试后,得到WLAN信号覆盖电平及质量,并选取合适的传播模型,计算WLAN室外站点的覆盖距离。最后,针对不同室外场景提出了建设和优化意见。     

阵列式AP 覆盖就是如此简单

WLAN网络作为无线上网的重要手段,具有网络带宽高、建设成本低、建设速度快等重大优势,随着WLAN在802．11n技术、室外宏覆盖技术、WLAN网络与3G网络融合、WLAN电信级可管可控等领域的进一步发展,WLAN网络的覆盖范围和服务质量将进一步提高。无线通信发展中,WLAN网络必将成为一种普遍的无线宽带接入方式融入人们的生活,而阵列式AP,又将是其中的佼佼者。     

WLAN工程设计

本文就WLAN工程设计提出了带有普遍意义的概念,包含室内覆盖、室外覆盖、室外(视距内)无线桥接。并就无线侧的规划、优化进行了浅析。     

关于WLAN覆盖的研究

针对目前WLAN建设中普遍存在的覆盖范围小、覆盖信号弱及覆盖不连续等覆盖问题,通过采用衰减因子模型对2.4 GHz频段进行链路预算分析,得出室内独立型AP及室内分布型AP、室外独立型AP等3种不同覆盖方式下的WLAN理论覆盖范围。根据不同覆盖方式的覆盖范围,结合不同的应用场景,提出了AP密集覆盖和室外AP+高增益定向天线等2种加强WLAN覆盖的措施,为WLAN覆盖提供了有效的解决思路。     

基于应用场景的WLAN无线参数优化方案研究

总结WLAN的常用场景,给出各类场景对应的WLAN网络特点和优化侧重点。通过对已投入商用的各类WLAN热点的各项无线参数进行反复设置、测试和验证,选取最佳取值范围作为该场景下的无线参数优化建议,并将各种参数整理成该场景下的一套参数模板,完全可以指导优化人员开展系统的WLAN无线参数优化工作。该套解决方案已在各种WLAN场景中得到运用,实际验证结果是有效的,并在运营商实际优化工作中推广。     

农村无线宽带技术比较与选择

采用无线宽带解决农村地区的上网需求已成为运营商在新形势下的必要方式,通过对WLAN室外覆盖、时分网桥型无线宽带、GSM-Hi这3种无线宽带技术进行介绍,以及其相互间在性能、建设方式、成本造价等方面的对比,总结出各自的适用场景、使用条件以及建设方式建议。     

TD-LTE网络覆盖方式探讨

LTE网络建设面临比2G/3G网络建设更多的困难和更高的要求,通过介绍LTE网络在室外连续覆盖和室内深度覆盖存在的一些问题,分析了无线覆盖在室内外不同场景需要重点关注的因素,并提出了部分解决方案和思路。     

智慧城市时代室内LTE部署方案浅析

随着智慧城市时代的到来,无线网络建设需要2G/3G/WLAN和LTE等多种网络制式协同组网,共同为智慧城市提供通信服务。文章结合实际工程调研,提出室内覆盖工程中LTE的建设原则,对不同的LTE室内分布系统建设方案进行对比分析,并结合某省联通实际网络建设情况,提出LTE室分的实施方案,对后续的网络建设提供参考依据。     

Wireless LAN access network architecture for mobile operators

The evolution of IP-based office applications has created a strong demand for public wireless broadband access technology offering capacity far beyond current cellular systems. Wireless LAN access technology provides a perfect broadband complement for the operators' existing GSM and GPRS services in an indoor environment. Most commercial public wireless LAN solutions have only modest authentication and roaming capability compared to traditional cellular networks. This article describes a new wireless LAN system architecture that combines the WLAN radio access technology with mobile operators' SIM-based subscriber management functions and roaming infrastructure. In the defined system the WLAN access is authenticated and charged using GSM SIM. This solution supports roaming between cellular and WLAN access networks and is the first step toward an all-IP network architecture. The proto-type has been implemented and publicly verified in a real mobile operator network     

5G NR室分共享覆盖解决方案

5G网络工作频段分配越来越高,导致室外覆盖室内深度覆盖不足,传统室分存量DAS支持的频段最高到2.7 GHz,为兼顾性能合理利用建设成本,利旧原有网络中已经部署的室分天馈线及设备,分析了高频导致室内深度覆盖不足的特点,根据传统室分网络的现状,以5G业务价值判断需求为场景划分,结合网络中各需求场景室内分布系统的建设特点,利用多样化方案应对差异化需求,多种建设方案并存的理念,给出了面向5G频段室分系统共享覆盖的网络建设思路。     

基于WLAN的无线校园网的设计与实现

随着IEEE 802.11无线局域网技术标准的不断推出以及基于这些标准的无线产品的出现,无线局域网的应用和普及已发展到了一个新阶段,基于WLAN的无线网络构建已成为组建无线校园网的主流技术,是有线校园网网络延伸的重要手段之一。结合东北石油大学无线校园网建设的工程实践,采用无线控制器＋＂瘦＂AP的无线网络解决方案,组建了基于WLAN的校园无线网络,并对相关的设计方法进行了详细说明。经过长期实践应用证明,该网络运行高速、稳定。     

LTE多场景室内立体深度覆盖综合解决方案与研究

为解决传统室内分布造价高、施工难度大、周期长等相关问题,采用室内立体深度覆盖综合解决方案可以迅速实现布放室内分布设备,提升多场景室内深度覆盖能力。对于各种不同类型的楼宇,需要根据场景特点、业务量需求制定个性化高效合理的立体解决方案,巧妙地将室外覆盖与室内深度覆盖相结合,充分体现施工美观、快速部署的特点,提升深度覆盖网络质量,同时大大降低建设成本。分场景制定立体室内深度覆盖解决方案,合理利用技术手段和硬件资源,以实现建设产出的最优回报。     

Policy-based QoS-management architecture in an integrated UMTS and WLAN environment

Strong demands for public wireless broadband services will require more capacity than even that can be,supplied by advanced mobile cellular systems like the Universal Mobile Telecommunication System. The increasing popularity of WLANs has prompted mobile network operators to consider their deployment in high-density usage areas like indoor/outdoor public hotspots to provide complementary broadband access to their UMTS networks. In order to provide consistent QoS control over an integrated UMTS and WLAN system, a policy-based multidomain QoS management architecture is proposed in this article. Different UMTS-WLAN interworking scenarios are discussed to illustrate the feasibility of the proposed architecture.     

Simple Indoor Path Loss Prediction Algorithm and Validation in Living Lab Setting

A simple heuristic algorithm has been developed for an accurate prediction of indoor wireless coverage, aiming to improve existing models upon multiple aspects. Extensive measurements on several floors in four buildings are used as validation cases and show an excellent agreement with the predictions. As the prediction is based on the free-space loss model for every environment, it is generally applicable, while other propagation models are often too dependent on the environment upon which it is based. The applicability of the algorithm to a wireless testbed network in a living lab setting with WLAN 802.11b/g nodes is investigated by a site survey. The results can be extremely useful for the rollout of indoor wireless networks.     

Physical Layer Design Alternatives for High Speed Outdoor Packet Radio Local and Medium Area Networks

In the last few years, the development of wireless local area networks (WLANs) has become a major goal in the field of computer and wireless communications. The Network Technologies Research group at the Communications Research Center in Canada has been working on a project to develop a high speed outdoor WLAN. In contrast to many existing WLANs, the new WLAN supports multimedia traffic such as voice, data and video; and will be used mainly in an outdoor environment with a cell coverage range of approximately 20 km. In this paper the physical layer design alternatives for the outdoor WLAN with a speed of 10 to 20 Mbps are described. Simulation results for some of the techniques considered to be used for the WLAN system are presented. The study is concluded by proposing two possible systems that one may consider for the implementation of a high speed outdoor WLAN. Although this study was primarily focused on WLAN applications, the results presented in this paper are applicable to several high speed wireless networks.