CDMA移动通信网络覆盖的几种方案

该文阐述了移动通信网络无线电覆盖的几种方案,讨论了移动通信网络覆盖需求及方式的变化,并就几种主要覆盖方案的特点及优势进行了分析。     

高速移动环境下组网方案

随着我国经济的迅速发展,高速公路和高速铁路将会越来越多。如何解决高速移动环境下的网络覆盖是运营商非常重视的问题。本文介绍了高速移动环境的特征,需要解决的问题。详述了网络规划和组网方案,包括组网方式、天馈选型、站点选择、LAC和RAC规划。     

RRU电源及传输一体化解决方案

随着光纤拉远技术的应用,远端射频单元（RRU）的供电问题日益受到运营商的重视,尤其在供电条件差的边远山区和农村地区,需要用新的方法来降低建设和维护成本以及提高网络运营安全。本文介绍的一体化解决方案为今后拉远基站的建设提供了一种新的思路。     

BBU基带池集中设置的探讨和建议

针对底层网络的特点，分析BBU＋RRU站点集中化建设的优缺点，给出了集中化建设“分片、选点、保障”的新思路，并总结了BBU集中化建设的工程经验，提出了建设建议。     

将RRU与思想一起拉远——中兴通讯GSM—R隧道覆盖解决方案

文章介绍了GSM—R隧道覆盖设计原则，提出了中兴通讯公司“BBU＋RRU”配合泄漏电缆的隧道覆盖解决方案，并对短遂道、中等遂道、隧道群下的具体组网方式进行了介绍。     

Pseudo global energy released locally by crack extension involving multiscale reliability

The energy release rate criterion, being mono scale by definition, is incompatible with the failure behavior of solids that are inherently dual, if not, multiscale. Time span of reliability is scale sensitive and can be addressed with consistency only by use of transitional functions that are designed to transform a function from one scale to another. A pseudo transitional energy release rate G^∗ is defined to address the cross-scaling properties of energy release rate. The reliability of such a function is found to fall quickly when the scale range deviates from that of micro-macro. In general, the time span of reliability based on G^* shortens considerably within the nano-micro and pico-nano scale ranges, resulting in fast turnover of system usability. Prediction accuracy tends to be scale range specific. Stress or strain based criteria are also mono scale. They may be adequate for some situations at the macroscopic scale, but can be ambiguous for multiscale problems. These situations are analyzed by application of the principle of least variance in conjunction with the R-integrals.Accelerated test data for the equivalent of 20 years’ fatigue crack growth in 2024-T3 aluminum panels were analyzed using the mutliscale reliability model. A time span plateau within the micro-macro range is from 8 to 17 years. This corresponds to the reliable portion of prediction, while the terminal 3 years are regarded as unreliable. A similar time span plateau were also found from 4 to 6 years within the nano-micro scale range. And an even smaller plateau hovering around 1.2 years were found for the pico-nano scale range. Time span of reliable prediction narrows with down sized scale range. The overlapping ends of the scale ranges are rendered unreliable as anticipated. These regions can be suppressed by the addition of meso scale ranges. Reference can be made to past discussions related to multiscaling and mesomechanics.     

高铁WCDMA多RRU级联组网出现的问题及解决方式建议

高铁WCDMA多RRU级联共小区组网虽然能够减少小区切换,但是由于多普勒效应,UE会收到两个不同频率的共小区信号,解调功能受到严重的影响,从而导致掉话,同时吞吐率急剧下降,这种现象在某些非高通芯片的WCDMA手机中特别明显。基于此,重点对多RRU级联共小区的原理以及出现的掉话问题进行分析,并提出了解决方式建议。【摘要】     

一种基于TTCN-3语言的RRU自动化测试实现

RRU是分布式基站的重要组成,设计和开发一个方便、快捷、自动化的测试平台极为必要.在分析RRU主要测试点的基础上,设计并实现了一套基于TTCN-3语言的RRU自动化测试平台,并进行了自动化测试.实际测试结果表明：该平台具有敏捷、稳定、高效和自动化的特点,自动化覆盖率达到85％,实现了设计的预期效果.     

一种具备环网治愈功能的LTE数字基带射频拉远组网架构设计与研究

文章分析了目前数字基带射频拉远组网方式优势与弊端,提出了基于粗波分复用(CWDM)技术的LTE数字基带射频拉远环形组网架构,分析并给出了其组网架构的优越性。     

基于BBU＋RRU的TD—SCDMA全覆盖解决方案

文章通过对基于BBU RRU的TD-SCDMA智能天线系统和传统基站进行比较,根据其技术特点,提出了针对不同无线环境的组网方案,为运营商将来建设低成本、高性能的3G网络提供参考。