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Potential key technologies for 6G mobile communications

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Science China(Information Sciences) 2020年第8期63卷 217-235页

作者： Yifei YUAN Yajun ZHAO Baiqing ZONG Sergio PAROLARI China Mobile ZTE Corporation

The standard development of 5G wireless communication culminated between 2017 and 2019,followed by the worldwide deployment of 5G networks, which is expected to result in very high data rate for enhanced mobile broadband, support ultrareliable and low-latency services and accommodate massive number of connections. Research attention is shifting to future generation of wireless communications, for instance, beyond 5G or 6G. Unlike previous studies, which discussed the use cases, deployment scenarios,or new network architectures of 6G in depth, this paper focuses on a few potential technologies for 6G wireless communications, all of which represent certain fundamental breakthrough at the physical layer —technical hardcore of any new generation of wireless communications. Some of them, such as holographic radio, terahertz communication, large intelligent surface, and orbital angular momentum, are of revolutionary nature and many related studies are still at their scientific exploration stage. Several technical areas, such as advanced channel coding/modulation, visible light communication, and advanced duplex, while having been studied, may find more opportunities in 6 G.

关键词： 6G holographic radio terahertz large intelligent surface orbital angular momentum advanced channel coding modulation visible light communication

zte's Perspective on Applying OFDM-PON in Next Converged Optical and Wireless Networks

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China Communications 2015年第4期12卷 50-57页

作者： ZHU Songlin GUO Yong YIN Yongjia ZTE Corporation

Driven by zte and other telecom vendors and operators in order to meet the ever increasing bandwidth demand from fixed optical network users and mobile backhaul/fronthaul services, the latest next generation passive optical network(NGPON2) is being standardized by Full Service Access Network(FSAN) and International Telecommunication Union(ITU-T) which consists of two separated sub-systems, hybrid time- and wavelength-division multiplexing PON(TWDM-PON) and point-to-point wavelength- division multiplex(Pt P WDM). The TWDM-PON will be used for traditional residential, business and wireless backhaul services which are not sensitive to time delay and delay variation, whereas the Pt P WDM is mainly used for emerging wireless fronthaul service which is very sensitive to the time delay and time delay variation. However, as a main international standards' contributor, zte thinks for those operators who offer multiple-level of services to both residential, business and mobile backhaul/fronthaul users, this obviously raises significant economic and power concerns by demanding to deploy two separated systems. Therefore, in this paper, for the fi rst time, zte proposes a new converged optical and wireless integrated network architecture and topology by applying orthogonal frequency division

关键词：中兴通讯无线网络应用光纤网络 PON技术服务质量时延变化国际电信联盟

Filter Design of Wireless Base Station Power Supply

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zte Communications 2024年

作者： LI Wei GUO Wei WANG Zhida ZTE Corporation

The design of electromagnetic interference (EMI) filters needs to fulfill the EMI standards. Designing a filter is a time-consuming process for new engineers as well as for those experienced engineers. This paper measured and compared the noise spectrum of the wireless base station power prototype with and without the original filter. The ideal insertion loss (IL) of the original filter is obtained by combining calculation and simulation. It is pointed out that the effect of the original filter is not good. Based on the improved insertion-loss method， the source impedance model of the prototype is established by combining measurement and theory. A procedure for designing EMI filters for switch power supply will be presented. The filter design procedure makes it possible to design filters quickly and easily. Finally， the proposed filter design method is proved to be effective by the EMI measurement of the wireless base station power supply prototype.

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Reconfigurable intelligent surfaces for 6G:applications,challenges,and solutions

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Frontiers of Information Technology & Electronic Engineering 2023年第12期24卷 1669-1688页

作者： Yajun ZHAO Beijing Institute of Technology Beijing100081China ZTE Corporation Beijing100029China

Scholars are expected to continue enhancing the depth and breadth of theoretical research on reconfigurable intelligent surface(RIS)to provide a higher theoretical limit for RIS engineering applications.Notably,significant advancements have been achieved through both academic research breakthroughs and the promotion of engineering applications and industrialization.We provide an overview of RIS engineering applications,focusing primarily on their typical features,classifications,and deployment scenarios.Furthermore,we systematically and comprehensively analyze the challenges faced by RIS and propose potential solutions including addressing the beamforming issues through cascade channel decoupling,tackling the effects and resolutions of regulatory constraints on RIS,exploring the network-controlled mode for RIS system architecture,examining integrated channel regulation and information modulation,and investigating the use of the true time delay(TTD)mechanism for RIS.In addition,two key technical points,RIS-assisted non-orthogonal multiple access(NOMA)and RIS-based transmitter,are reviewed from the perspective of completeness.Finally,we discuss future trends and challenges in this field.

关键词： 6G Reconfigurable intelligent surface(RIS) Cascade channel decoupling RIS regulatory constraint RIS system

Ultra Dense Network:Challenges,Enabling Technologies and New Trends

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China Communications 2016年第2期13卷 30-40页

作者： HAO Peng YAN Xiao Yu-Ngok Ruyue YUAN Yifei ZTE Corporation Shenzhen China

5G sets an ambitious goal of increasing the capacity per area of current 4G network by 1000 fold. Due to the high splitting gain of dense small cells, ultra dense network(UDN) is widely considered as a key component in achieving this goal. In this paper, we outline the main challenges that come with dense cell deployment, including interference, mobility, power consumption and backhaul. Technologies designed to tackle these challenges in long term evolution system(LTE) and their deficiencies in UDN context are also analyzed. To combat these challenges more efficiently, a series of technologies are introduced along with some of our initial research results. Moreover, the trends of user-centric and peer-to-peer design in UDN are also elaborated.

关键词： 5G 传感网络网络互补

Cascaded channel decoupling based solution for RIS regulation matrix

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Intelligent and Converged Networks 2024年第1期5卷 19-27页

作者： Yajun Zhao Beijing Institute of Technology Beijing 100081China ZTE Corporation Beijing 100029China

This article presents a pioneering solution to address the challenges of reconfigurable intelligent surface(RIS),employing a cascaded channel decoupling strategy.This novel method streamlines the RIS regulation matrix by dividing the process of electromagnetic wave modulation into two separate sub-processes:virtual receiving response and virtual regular transmission,resulting in the decoupling of the RIS cascaded channel.Furthermore,the paper explores the practical implementation of this channel decoupling method in two typical scenarios,including single-user and multi-user access,offering detailed insights into its application.Through numerical simulations,the article demonstrates the effectiveness and reduced complexity of the proposed scheme in enhancing the efficiency of the RIS regulation matrix.

关键词： reconfigurable intelligent surface channel decoupling receiving matrix transmitting matrix

zte Demonstrated Pre-5G 3D/Massive MIMO System successfully

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China Communications 2015年第1期12卷 145-145页

作者： ZTE Corporation ZTE Corporation

As one of the leading technologies of future 5G,massive MIMO has gained significant attention from both academia and wireless industry over the last two years.Throughout the world,massive MIMO is being studied by various organizations and consortiums.In the arena of China's IMT-2020,ZTE Corporation is investing huge effort in research

关键词： MIMO系统中兴通讯 MIMO技术 3D 学术界

Log Anomaly Detection though GPT-2 for Large Scale Systems

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zte Communications 2023年

作者： JI Yuhe HAN Jing ZHAO Yongxin ZHANG Shenglin GONG Zican Nankai University ZTE Corporation

As the scale of software systems expands， maintaining their stable operation has become an extraordinary challenge. System logs are semi-structured text generated by the recording function in the source code and have important research significance in software service anomaly detection. Existing log anomaly detection methods mainly focus on the statistical characteristics of logs， making it difficult to distinguish the semantic differences between normal and abnormal logs， and performing poorly on real-world industrial log data. In this paper， we propose an unsupervised framework for log anomaly detection based on generative pre-training-2 (GPT-2). We apply our approach to two industrial systems. The experimental results on two datasets show that our approach outperforms state-of-art approaches for log anomaly detection.

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5G technology requirements and related test environments for evaluation

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China Communications 2016年第S2期13卷 42-51页

作者： Xi Meng Jian Li Dong Zhou Dacheng Yang Beijing University of Posts and Telecommunications ZTE Corporation

To meet the considerably increase of mobile data traffic and wireless communication connections around 2020,the 5th generation(5G)mobile network will necessarily consider more frequency bands,enabling technologies and diversified key performance indicators and test environments comparing with existing network,for example Long Term Evolution.More specifically,the obvious difference between 5G and previous wireless communication system are not only included eMBB(enhance mobile broadband) usage scenario,but also introduced mMTC(massive machine type communications)and URLLC(ultra-reliable and low latency communications) usage scenarios.Hence,in order to evaluate 5G related technologies,some novel test environments will be widely discussed,as well as,certain new key performance indicators will be drawn into5 G evaluation methodology for satisfied new requirements.We will discuss characteristic of these 4 candidate test environments,such as indoor isolated environment,high speed train environment;and the definition of 15 keys performance indicator will be explained and clarified,for example,Throughput,Network Energy Efficiency,Device Connection Density and so on.Furthermore,high-level assessment method of each test environment also will be initially considered.It is notable that an initial evaluation of indoor isolated environment also can be found,which the results show that there are 3 times average cell spectral efficiency than IMT-advanced's in same test environment.

关键词： 5G IMT-2020 test environment requirements key performance indicators