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Time-domain ICIC and optimized designs for 5G and beyond: a survey

Science China(Information Sciences) 2019年第2期62卷 18-45页

作者： Ling LIU Yiqing ZHOU Athanasios V.VASILAKOS Lin TIAN Jinglin SHI Beijing Key Laboratory of Mobile Computing and Pervasive Devices Institute of Computing TechnologyChinese Academy of Sciences University of Chinese Academy of Sciences Department of Computer Science Lule?a University of Technology

Time-domain enhanced inter-cell interference coordination(eI CIC) is an effective technique to reduce the cross-tier inter-cell interference(ICI) in long term evolution(LTE)-based heterogeneous small cell networks(HetSCNs). This paper first clarifies two main communication scenarios in HetSCNs, i.e., macrocells deployed with femtocells(macro-femto) and with picocells(macro-pico). Then, the main challenges in HetSCNs, particularly the severe cross-tier ICI in macro-femto caused by femtocells with closed subscribe group(CSg) access or in macro-pico caused by picocells with range expansion are analyzed. Based on the prominent feature of dominant interference in HetSCNs, the main idea of time-domain interference coordination and two basic schemes in the eI CIC standardization, i.e., almost blank subframe(ABS) and orthogonal frequency division multiplexing symbol shift are presented, with a systematic introduction to the interactions of these techniques with other network functions. Then, given macro-femto and macro-pico HetSCNs, an overview is provided on the advanced designs of ABS-based eI CIC, including self-optimized designs with regard to key parameters such as ABS muting ratio, and joint optimized designs of ABS-based eI CIC and other radio resource management techniques, such as user association and power control. Finally, the open issues and future research directions are discussed.

关键词： eI CIC almost blank subframe joint optimized design heterogeneous small cell networks 5G and beyond

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Design of Power Amplifier for mm Wave 5G and beyond

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第4期36卷 579-588页

作者： LI Lianming SI Jiachen CHEN Linhui School of Information Science and Engineering Southeast UniversityNanjing 210096P.R.China National Mobile Communications Research Laboratory Nanjing 210096P.R.China Purple Mountain Laboratories Nanjing 211100P.R.China

With targets of cost reduction per bit and high energy efficiency,5G and beyond call for innovation in the mmWave transmitter architecture and the power amplifier(PA)circuit.To illustrate these points,this paper firstly explains the benefits and design implications of the hybrid beamforming structure in terms of the mmWave spectrum characteristics,energy efficiency,data rate,communication capacity,coverage and implementation technology choices.Then after reviewing the techniques to improve the power amplifier(PA)output power and efficiency,the design considerations and test results of 60 gHz and 90 gHz mmWave PAs in bulk complementary metal oxide semiconductor(CMOS)process are shown.

关键词： 5G and beyond 6g beamforming complementary metal oxide semiconductor(CMOS) mmWave multiple⁃input multiple⁃output(MIMO) power amplifier transmitter

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A novel proactive soft load balancing framework for ultra dense network

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Digital Communications and Networks 2023年第3期9卷 788-796页

作者： Miaona Huang Jun Chen School of Electrical Engineering and Intelligentization Dongguan University of TechnologyDongguanGuangdong523808China Huawei Technology Shenzhen518129China

A major challenge for the future wireless network is to design the self-organizing architecture.The reactive self-organizing model of traditional networks needs to be transformed into an active self-organizing network.Due to the user mobility and the coverage of small cells,the network load often becomes unbalanced,resulting in poor network performance.Mobility management has become an important issue to ensure seamless communication when users move between cells,and proactive mobility management is one of the important functions of the active Self-Organizing Network(SON).This paper proposes a proactive mobility management framework for active SON,which transforms the original reactive load balancing into a forward-aware and proactive load balancing.The proposed framework firstly uses the BART model to predict the users’temporal and spatial mobility based on a weekly cycle and then formulate the MLB optimization problem based on the soft load.Two solutions are proposed to solve the above MLB problem.The simulation results show that the proposed method can better optimize the network performance and realize intelligent mobile management for the future network.

关键词： 5G and beyond Proactive load balancing Heterogeneous network Soft load Location prediction

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Physical layer security for massive access in cellular Internet of Things

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Science China(Information Sciences) 2020年第2期63卷 104-115页

作者： Qiao QI Xiaoming CHEN Caijun ZHONg Zhaoyang ZHANg College of Information Science and Electronic Engineering Zhejiang University

The upcoming fifth generation(5g) cellular network is required to provide seamless access for a massive number of Internet of Things(IoT) devices over the limited radio spectrum. In the context of massive spectrum sharing among heterogeneous Io T devices, wireless security becomes a critical issue owing to the broadcast nature of wireless channels. According to the characteristics of the cellular IoT network,physical layer security(PHY-security) is a feasible and effective way of realizing secure massive access. This article reviews the security issues in the cellular IoT network with an emphasis on revealing the corresponding challenges and opportunities for the design of secure massive access. Furthermore, we provide a survey on PHY-security techniques to improve the secrecy performance. Especially, we propose a secure massive access framework for the cellular Io T network by exploiting the inherent co-channel interferences. Finally, we discuss several potential research directions to further enhance the security of massive IoT.

关键词： 5G and beyond PHY-security massive access cellular IoT

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A novel fractional uplink power control framework for self-organizing networks

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Digital Communications and Networks 2023年第6期9卷 1434-1440页

作者： Zezhou Luo Hongcheng Zhuang Wireless Technology Innovation Center Guangdong Communications and Networks InstituteShenzhen510663China School of Electronics and Communication Engineering SUN YAT-SEN UniversityShenzhen518107China

Internet of things and network densification bring significant challenges to uplink management.Only depending on optimization algorithm enhancements is not enough for uplink transmission.To control intercell interference,Fractional Uplink Power Control(FUPC)should be optimized from network-wide perspective,which has to find a better traffic distribution model.Conventionally,traffic distribution is geographic-based,and ineffective due to tricky locating efforts.This paper proposes a novel uplink power management framework for Self-Organizing Networks(SON),which firstly builds up pathloss-based traffic distribution model and then makes the decision of FUPC based on the model.PathLoss-based Traffic Distribution(PLTD)aggregates traffic based on the propagation condition of traffic that is defined as the pathloss between the position generating the traffic and surrounding cells.Simulations show that the improvement in optimization efficiency of FUPC with PLTD can be up to 40%compared to conventional geographic-based Traffic Distribution(ggTD).

关键词： 5G and beyond Self-organizing networks Uplink power control Optimization efficiency Traffic distribution

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