Hybrid RF/VLC Communications Using Reconfigurable Intelligent Surfaces

In this paper, we suggest the use of Reconfigurable Intelligent Surfaces (RIS) for hybrid Radio Frequency (RF) Visible Light Communications (VLC). The signal is transmitted from a transmitter T to a relay C using RIS. RIS is implemented as a transmitter or a reflector between T and C. The relay node C decodes the received signal and transmits it to the receiver R using a VLC link. The proposed VLC/RF communications using RIS offers 20–45 dB gain with respect to conventional RF/VLC when the number of reflectors N is varied from \(N=16\) to \(N=256\).

     

5G无线通信网络物理层关键技术

信息社会日益增长的需求,促使着无线通信技术的不断发展。计划于2020年进入商业运营的5G无线通信技术,尚在探索和研究阶段。从无线通信的发展历程出发,介绍了当前国内外的无线通信发展的最新趋势,然后从频谱资源紧缺、系统容量亟需提高的角度,着重介绍了两个关键的物理层技术——毫米波通信技术和大规模MIMO技术,以应对未来无线通信的发展要求。此外,还概括性地介绍了5G无线通信系统的应用场景以及未来的发展趋势。     

专题:面向B5G/6G的智能边缘计算网络技术

随着我国5G网络的规模化部署与商用,目前是开展B5G/6G研究的关键阶段。面向未来B5G/6G的主要可能应用场景,例如车联网、工业互联网、空天地海一体化等网络的业务特征,形成了通信-计算-感知一体化融合、通信网络与人工智能融合等新趋势,构建智能边缘计算网络平台与架构,解决智能资源管理与调度、低时延与高可靠传输技术等关键科学问题和技术,对推动移动通信网络朝着6G演进,保持国家在该领域的领先地位,并促进数字经济发展具有重要意义。     

A Cost-Effective 5-W GaN HEMT Power Amplifier for Sub-6-GHz 5G Wireless Communications

Mobile Networks and Applications - In this paper, a design method of a compact, low-cost and high-efficiency microwave power amplifier for using in the 5G wireless communication applications is...     

4G/5G协同无线网工程建设方案

如何处理好4G/5G在资源上的矛盾,解决好二者之间的协同,是当前无线网规划与工程建设面临的新课题。首先结合中国移动5G 2.6 GHz频率使用策略,提出面向4G/5G协同的工程建设方案,随后聚焦4G/5G天面协同,以中国移动现网多制式多频段天馈现状为出发点,提出“最佳三副、最少两副”的天面目标形态建议,并针对原有4 G D频段天馈调整、5G天馈建设给出分场景工程建设方案。     

5G无线网共享建设方案

随着5G网络的商用和大规模部署,5G设备单站成本高、站址需求大、功耗高等问题成为运营商5G网络建设和运营中的巨大挑战。在国家网络强国战略和提速降费的要求下,运营商需要探索新的网络建设和运营模式,在保障5G网络高质量建设的基础上提升5G网络的效益和资产运行效率,网络共建共享模式成为电信运营商5G运营新模式。从网络共享技术方案分析入手,分析了异网漫游和接入网络共享技术方案,结合中国联通和中国电信5G网络共享,分析了接入网共享下NSA网络共享方案和SA演进方案。     

4G/5G无线网融合和协同的规划与建设

文章针对4G/5G无线网的各自定位,对4G/5G无线网在组网架构、规划及建设策略、技术演进及配套建设等方面的融合和协同进行分析,提出4G/5G无线网融合和协同的模式和方向,实现优化投资结构和网络平滑演进,从而积累5G规划部署经验,为后续大规模商用建设做好准备。     

A Wireless Network for Wide-Band Indoor Communications

We propose and analyze a wide-band indoor communication system that uses radio as the transmission medium either on a stand-alone basis or to supplement a hard-wired network for those situations where complete portability is desired. One principal impairment to such a system is intersymbol interference caused by frequencyselective fading. A novel media-access scheme is proposed which permits the use of resource sharing, wherein a small pool of time slots is effectively shared among all users to provide added protection against channel impairments on an as-needed basis. Our results show that the use of resource sharing and diversity provide excellent protection against intersymbol interference caused by frequency-selective fading with negligible impact on throughput. Furthermore, resource sharing plus diversity can permit significantly higher data rates without large queueing delays. For example, a wireless network with a 10 Mbit/s data rate in a 10 MHz bandwidth using four antennas at the base station has a less than 10^-4outage probability at a 10^-4BER in buildings with less than 58 ns rms delay spread. A loading of 75 percent is permitted for a queueing delay of less than 20 packet transmission times all but 0.01 percent of the time.     

面向B5G/6G的三三三网络体系架构和优化学习机制

面对未来B5G/6G网络是大连接复杂智能网络,极其大量的用户连接、需求连接、服务连接,加之3G、4G、5G甚至6G的综合运用,将导致网络变得极其复杂的挑战,提出了一种三三三网络体系架构,它是一个包含3类网络(核心网、接入网、终端网)、3种资源(频率带宽、功耗、时延)和3项需求(生活、工作、服务)的三维立体综合优化的体系...     

A New Network Architecture for Wireless Communications

Current cellular systems are based on theconcept of the cell. Although the cell allows channelreuse, it has also become a metaphor for channelconfinement and leads to the thorny problem of handoffand call dropping. The problem will get much worseas wireless networks move toward smaller cells andmultirate. A new network architecture for wirelesscommunications is presented in this paper. Thearchitecture — called MAWCC for its main characteristic,MAcrodiversity Without Channel Confinement — hasno ping-pong effect in handoff. Furthermore, itscapacity gain from macrodiversity can be freelyconverted into handoff reduction. The new architecture offers manyoptions to handle mobility which are not possible in aconventional cellular architecture.     

B3G无线通信中合作网络的一种新型无线接入方案

The paper discusses the signifi cance and development foreground of co-operation among heterogeneous networks in composite radio context for B3G wireless communications. The concept of composite reconfigurable wireless network is introduced in the paper, and the development of future wireless communication systems is also discussed. The basic confi guration framework of the network interoperation is given, and the functions of important parts are analyzed. A management platform for co-operation between WLAN...     

5G无线网络架构对传输网的影响

为了满足3种5G典型业务的覆盖和容量的需求,5G网络中引入了非独立和独立部署4G和5G组网架构以及集中单元(CU)/分布单元(DU)分离的设备形态。新的无线网络架构对于未来传输网的部署也提出了新的挑战。基于当前5G网络架构的标准进展,从无线网络的角度分析了5G网络架构对传输网的影响和需求。     

E-Shaped Patch Antennas for Multitasks/Uninterrupted 5G Communications

Wireless Personal Communications - The future communication system is a fifth generation (5G) wireless communication. This communication system requires an antenna with a simple design, low traffic...     

A Survey on Advanced Multiple Access Techniques for 5G and Beyond Wireless Communications

Wireless Personal Communications - This paper summarizes the ongoing research initiatives based on the advanced multiple access techniques towards the fifth generation (5G) wireless communication...     

5G无线网工程建设技术要求研究

本文针对5G基站的建设特点,结合5G实验网测试数据,分别针对室外站和室分站研究了5G无线网工程建设技术方案。重点从4G/5G设备比较、5G站间距、5G天面建设、5G干扰要求、5G BBU安装、5G电源工程和5G室分方案等方面进行分析,提出5G BBU安装工艺和5G基站干扰隔离的要求,解决了5G工程建设天面空间不足、BBU散热要求较高和功率需求较大的问题。     

无线通信网络的安全问题及对策

本在对全球无线网络发展进行回顾的基础上,指出了无线网络与有线网络相比,有其特殊性,包括开放性、移动性、传输信道的不稳定性等,然后对无线网络面临的安全威胁进行了深入分析,总结了其面临的安全问题,包括监听攻击、插入攻击、无线攻击、移动IP安全等,最后提出了相应的解决对策。     

基于软件定义的以用户为中心的5G无线网络架构

5G无线接入网络是一种复杂的异构网络,各个协议之间的封闭性限制了网络性能.为了统一管理异构网络,向用户提供个性化的服务,提出了一种基于软件定义的以用户为中心的新型网络架构.该架构通过软件定义的形式统一管理所有无线网络,打破了传统蜂窝小区的概念,针对每个用户生成以用户为中心的小区,小区内的所有基站都能为该用户提供服务.这种新的网络架构能够为用户提供个性化的网络服务,提升用户的峰值速率和边缘用户性能.     

5G URLLC无线网络部署方案分析

URLLC场景是5G的典型应用场景之一,也是体现5G技术先进性的重要场景。随着URLLC增强技术标准化工作的完成,运营商需要明确5G URLLC网络下承载的典型业务,推动URLLC无线网络的部署。根据3GPP对不同业务网络指标需求的分析,结合ITU对URLLC场景时延与可靠性指标的要求,分析URLLC场景下潜在的应用,探讨了5G URLLC无线网络的部署方案。     

5G无线网络优化流程及策略分析

随着5G关键技术的运用和新的部署场景,5G网络优化与3G、4G网络优化存在着很大差异,5G网络优化面临很大挑战。文章针对5G关键技术的参数、网络的部署架构和业务场景应用特点,从网络优化流程、优化差异等要点,对5G网络优化流程及差异进行分析,重点对5G网络的业务优化、覆盖优化、容量优化、方案策略等方面进行深入研究,对5G无线网络优化提出建议策略。     

基于5G无线网络的智能干扰技术

近年来,我国移动通信技术快速发展,5G通信技术也得到了广泛应用。其中,5G无线网络中的超密集组网的部署会导致干扰问题的出现。文中分析了基于5G无线网络的智能干扰技术的应用,希望可以为5G干扰管理提供借鉴。