共建共享模式下5G前传承载方案研究

文章简要介绍了第五代移动通信技术(5 G)前传网络技术架构,对中国电信和中国联通共建共享建网模式下5 G前传需求进行了分析,并给出了5G前传承载实施方案;同时,结合中国电信与中国联通5G共建共享模式下的工程建设经验,给出了5G前传网络建设规划、工程设计及施工方案建议.基于无源波分复用技术,可以有效减少光纤资源消耗,降低...     

面向5G前传的新型CWDM承载方案

随着5G网络流量快速增长,6通道25 Gbit/s前传承载需求日趋明显。介绍了移动前传在现网部署的主要方案和标准化情况,针对6通道25 Gbit/s前传低成本承载需求,提出了一种基于CWDM/光环行器的承载方案,分析了该方案的优势与面临的挑战,介绍了该方案在实验室测试和现网试点的情况。     

一种用于5G前传的半有源波分复用方案

5G作为新一代移动通信技术,具有大带宽、低时延和海量连接等特点。5G可为用户带来革命性的业务体验,也能开发新型商业模式,为通信运营商提供持续增长的新动力。为满足5G技术的三大业务场景的需求,需要前传技术综合考虑网络资源、成本和技术成熟度等各方面因素,满足低时延、高可靠性的要求。并本文通过对现有前传技术的分析,明确原有技术的优缺点,提出了半有源波分复用方案。该方案采用非对称的设备形态,适应C-RAN组网,利用现有成熟技术,在提供网管和保护恢复功能的基础上,保证技术简洁,降低设备成本。该方案与现有前传方案相比,具有明显的综合优势。     

基于光纤传送网的5G移动通信前传关键技术

移动前传网络是C-RAN(集中式/云无线接入网)技术中的重要部分。随着现代无线接入网络的发展演进,用户带宽需求的快速增长对网络的传输速率提出了更高的要求。文章回顾了移动前传网络的基本内容,分析了前传网络需要满足的各项需求,并对当前提出的各种前传网络的解决方案进行了详细的介绍。     

基于无源波分复用的5G前传扩芯方案

文章主要讨论中国联通深圳市分公司在5G前传建设中采用无源波分复用方案对纤芯不足站点的扩芯试验。在了解需求背景、分析组网资源现状后,通过现场安装无源波分设备及测试相关参数,解决了从DU到AAU之间纤芯不足的问题,在光缆资源有限的情况下成功实现了5G站点的开通。     

面向下一代移动通信的前传网络关键技术

下一代宽带移动通信的容量相对5G通信提升百倍至千倍,这对支撑其发展的前传光通信网络的物理基础提出了巨大的挑战。系统回顾和梳理了移动前传网络的需求、技术和实现架构等。以光纤无线融合接入为基础,重点针对数字前传技术、模拟前传技术和数模结合前传技术3类移动前传架构,围绕其网络架构、关键技术和未来发展方向进行了深入的分析和探讨,并对未来前传网络关键技术进行展望。本研究可为未来移动前传网络的研究提供参考。     

C-RAN模式下的5G承载网前传方案研究

针对5G规模化建设过程中的前传方案选择问题,从5G前传网架构变化入手,分析5G网络C-RAN(集中化无线接入网)大集中和C-RAN小集中两种不同架构下的前传网需求。给出光纤直连、无源波分、有源波分、半有源波分四种前传技术方案的组网结构,并结合两种C-RAN架构的差异化需求,对四类前传网技术方案进行优劣分析,最后给出不同业务场景下的前传网组网建议。     

WDM-PON技术在5G前传承载中的应用研究

前传在5G(第五代通信技术)承载网性能与网络优势发挥上起到越来越重要的支撑作用。文章通过各类技术在5G前传承载中的应用研究,充分对比差异及优缺点,得出C-RAN(集中化无线接入网)方式下高速WDM-PON(波分复用无源光网络)作为前传技术具备建网快捷、建设成本低、运营维护简便等多种优势,为WDM-PON技术在5G前传网络中的规模部署提供有力支撑,也能更快推动WDM-PON产业链的成熟和发展。     

基于基站光缆网解决5G前传方案研究

本文通过分析5G前传光缆的需求与当前基站光缆网的建设特点,提出有效的使用基站光缆网满足5G前传需求的建设方案。对前期基站组网结构进行逐一分析,根据区域覆盖情况、站点情况和光缆环路情况,确定了多维的组网模型,并分别制定了相应的承载方案,以期充分利用网络资源,减少投资浪费,并能够最大限度的提升建设效率。     

Multi-pump discrete Raman amplifier for CWDM system in the O-band

We demonstrate theoretically that discrete Raman amplifiers operating in the O-band region (1260–1360 nm) are more efficient than in any other band if we consider the fiber attenuation. Compared with the C-band (1530–1565 nm), the net gain is 3 dB higher. We present also theoretically two types of discrete Raman amplifiers which can be used in the O-band with a course wavelength division multiplexing system. The first amplifier has a bandwidth of 70 nm that was designed with four pump lasers operating at 12XY nm. The second one has a bandwidth of 100 nm and needed six pump lasers to obtain a flattened gain across the O-band. In addition, we have analyzed the gain saturation in both optical amplifiers.     

5G前传WDM技术方案进展分析

介绍了5G前传WDM承载的典型架构,在此基础上分析了4种WDM技术方案的实现差异及目前产业和标准化进展,最后对5G前传WDM方案的发展提出了相关建议.     

色散与损耗对无源波分在5G前传应用中的影响分析

无源波分在5G前传网络中得到了广泛的应用,但由于光纤色散在粗波分复用系统中无法忽略,且迫于成本原因没有做色散补偿,导致复用比为1:12和1:18的无源波分后6波存在较大色散代价,限制了其传输距离,成为了无源波分应用的一大瓶颈。本文首先从光纤色散的原理出发,结合传输链路损耗进行综合分析,给出了两者与传输距离间的关系。并根据厂家提供的参数建立覆盖模型,对常见无源波分类型进行覆盖分析,最后结合分析结果给出了无源波分的4种主要应用场景与使用建议。     

面向C-RAN的5G前传方案研究

介绍了5G C-RAN的架构,分析了5G前传接口的传输指标要求及端口数量需求,提出了满足5G前传接口需求的几种前传方案,在对各种方案的技术特点进行分析后,提出了当前应对5G前传当前可采取的措施。     

Requirements on Satellite Access Node and User Equipment for Non-Terrestrial Networks in 5G New Radio of 3GPP Release-17

For the first time, 3GPP considered in Release-17 the introduction of mobile satellite service (MSS) frequency bands for 3GPP user equipment (UE) direct connectivity with satellites and had to consider the coexistence in adjacent bands with terrestrial networks (TNs). This paper will further explain the most challenging and the main surprising outcomes of this work, which opened new market opportunities for both terrestrial and nonterrestrial stakeholders. 5G New Radio nonterrestrial networks (NTNs) for satellite communications are representing a major breakthrough in the history of telecommunication for the capability of reuniting two different types of services, that is, terrestrial and nonterrestrial, by reusing the same waveform and potentially the same type of terminal. One of the major conclusions of the 5G NR NTN 3GPP work in Release-17 was that NTN UE could reuse the current requirements of the TN UE. For this reason, the same terminal can connect to both TNs and to nonterrestrial satellite constellations. Consequently, the market is not fragmented and therefore there will be a real opportunity for both terrestrial and satellite operators to increase the coverage and the quality of the service all over the world. This is one of the most important breakthroughs that 3GPP Release-17 work was able to justify because it clearly shows that satellite connectivity using 5G NR technology is not only for dedicated satellite 5G NR UE with a higher power class. On the other hand, the 3GPP work also shows that the satellite connectivity does not require a dedicated satellite waveform, because 5G NR waveform based on CP-OFDM (for downlink) and DFT-s-OFDM (for uplink) is sufficient. Another important finding is that TN can coexist with NTN on adjacent channels with relaxed ACIR requirements for the tested simulation scenarios. In fact, the satellite 5G NR requirements are lower when compared with terrestrial base station (BS) requirements from previous 3GPP releases. The satellite ecosystem tremendously changed after these findings, and both satellite and terrestrial stakeholders now see a potential market opportunity.     

Common source power amplifier design for 5G application in 28-nm UTBB FD-SOI technology

The telecommunication market examines a highly growing demand for RF mobile devices where low latency and high performance are ongoing improvement. The power amplifier (PA) is a major element of the radio frequency front-end; especially if power consumption and bandwidth are considered. This paper presents the design of 5G mm-wave PA using both Common Source Class-AB and Class-J topologies utilizing 28-nm UTBB FD-SOI technology and its body bias technique. Upon taking into consideration the parasitic extraction of the transistor, RF pads, and interconnection to ground, a comparison is made and the theoretical effectiveness of Class-J topology for single stage large signal amplification is simulated. Moreover, two distinct transistors - widths of 250 µm and 350 µm - are simulated where each has its own topology in order to study the impact of increasing the width on the performance of the PA. The stability of the designed Power Amplifiers is taken into consideration and the unconditional stability conditions are approved. While 5G spectral band is not yet specified and determined, recent studies proved that the 28 GHz band is particularly effective for 5G mobile standardization.     

一种应用于5G非授权频段通信的低时延随机接入机制

针对5G非授权频段通信(NR-U)场景,该文提出一种新型的低时延随机接入机制。该机制分别在随机接入回复窗口(RARW)与竞争窗口中加入了信道空闲计时器,来减少UE因在非授权频段进行竞争接入所引起的时延;此外该机制还加入了请求发送/允许发送机制,来解决隐藏节点对随机接入过程的影响。该机制可降低传统机制中由于未考虑非授权频段特性及隐藏节点问题所引起的随机接入时延问题。该文首先对NR-U场景中的传统随机接入机制进行分析并进行问题定位;其次,提出新型随机接入机制的网络实体交互流程,建立新型机制与传统机制中的网络实体交互时序模型;最后以数学推导和仿真的方法对新型机制与传统机制进行对比评估,相关结果显示出新型机制在平均耗时方面的优势。