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Load-Aware Offloading Strategy in Two-Tier Heterogeneous Network

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China Communications 2016年第8期13卷 148-158页

作者： Jianyuan Feng Zhiyong Feng zhiqing wei Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications

Although small cell offloading technology can alleviate the congestion in macrocell, aggressively offloading data traffic from macrocell to small cell can also degrade the performance of small cell due to the heavy load. Because of collision and backoff, the degradation is significant especially in network with contention-based channel access, and finally decreases throughput of the whole network. To find an optimal fraction of traffic to be offloaded in heterogeneous network, we combine Markov chain with the Poisson point process model to analyze contention-based throughput in irregularly deployment networks. Then we derive the close-form solution of the throughput and find that it is a function of the transmit power and density of base *** on this, we propose the load-aware offloading strategies via power control and base station density adjustment. The numerical results verify our analysis and show a great performance gain compared with non-load-aware offloading.

关键词： heterogeneous networks offloading strategies load-aware Poisson point process Markov chain throughput maximization CSMA

Fractal theory based dynamic mesh grouping scheme for efficient cognitive pilot channel design

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Chinese Science Bulletin 2012年第28期57卷 3684-3690页

作者： FENG ZhiYong wei zhiqing ZHANG QiXun ZHANG Ping Wireless Technology Innovation Institute(WTI) Key Laboratory of Universal Wireless CommunicationsMinistry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China

As one of the key characteristics in cognitive wireless networks(CWNs),network environment awareness techniques have received much attention *** of traditional spectrum sensing technology that suffers from problems of miss detection,false alarm,hidden node,and inefficiency,cognitive pilot channel(CPC) technology has been proposed as one of the candidate solutions for an efficient and accurate network information delivery scheme to user equipment(UE).The aim of the CPC technology is to provide the necessary information for the reconfiguration of the UE using the public signaling *** ensure the efficient information delivery,the whole geographical area covered by the CPC is divided into square meshes of the same ***,two typical network information transmission modes for CPC deployment are also proposed:broadcast CPC mode and on-demand CPC *** further improve the efficiency of network information delivery,an efficient dynamic mesh grouping scheme has been designed which is based on the fractal theory for the broadcast CPC mode,where adaptive rectangular sized meshes are used to approximately cover the whole *** to the traditional fixed size mesh division strategy,results show that the proposed dynamic mesh grouping scheme significantly reduces the number of meshes by grouping similar meshes together,and the average delay of receiving CPC information on the UE side is therefore reduced.

关键词：分形理论导频信道动态网分组设计无线网络信息传送方形网格

Cognitive information metrics for cognitive wireless networks

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维普期刊数据库

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Chinese Science Bulletin 2014年第17期59卷 2057-2064页

作者： Zhiyong Feng zhiqing wei Qixun Zhang Ping Zhang Key Laboratory of Universal Wireless Communications Ministry of EducationWireless Technology Innovation Institute (WTI)Beijing University of Posts and Telecommunications

Considering the dynamic changes and uncertainty features of the radio environment in cognitive wireless networks(CWNs),the environment cognition ability is critical for the performance evaluation of CWNs design and ***,there are no effective metrics to evaluate the ability and gain of information cognition in CWNs from an information theory ***,the novel cognitive information concept is proposed and defined as a metric to evaluate the uncertainty of both the internal and external environments of one system that can be removed by other systems or nodes using cognitive radio *** an intelligent wireless communication system that is aware of its surrounding radio,network,and user multi-domains environment,the more cognitive information it achieves,the higher level cognitive capability it *** this paper,we define and analyze the mathematical features of cognitive *** reveal that the increase of cognitive information can improve the spectrum efficiency and reduce the interference probability simultaneously in *** cognitive information can be regarded as a metric for CWNs ***,we apply the theory of cognitive information in the parameters optimization in energy detection and cooperative spectrum sensing.

关键词：信息理论无线网络度量无线通信系统无线电环境高频谱效率认知能力参数优化

A Dual-Cluster-Head Based Medium Access Control for Large-Scale UAV Ad-Hoc Networks

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China Communications 2024年第5期21卷 123-136页

作者： Zhao Xinru wei zhiqing Zou Yingying Ma Hao Cui Yanpeng Feng Zhiyong Key Laboratory of Universal Wireless Communications Ministry of EducationSchool of Information and Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing100876China

Unmanned Aerial Vehicle(UAV)ad hoc network has achieved significant growth for its flexibility,extensibility,and high deployability in recent *** application of clustering scheme for UAV ad hoc network is imperative to enhance the performance of throughput and energy *** conventional clustering scheme,a single cluster head(CH)is always assigned in each ***,this method has some weaknesses such as overload and premature death of CH when the number of UAVs *** order to solve this problem,we propose a dual-cluster-head based medium access control(DCHMAC)scheme for large-scale UAV *** DCHMAC,two CHs are elected to manage resource allocation and data forwarding ***,two CHs work on different *** of CH is used for intra-cluster communication and the other one is for inter-cluster communication.A Markov chain model is developed to analyse the throughput of the *** result shows that compared with FM-MAC(flying ad hoc networks multi-channel MAC,FM-MAC),DCHMAC improves the throughput by approximately 20%~50%and prolongs the network lifetime by approximately 40%.

关键词： dual cluster head medium access control UAV swarm

Joint Radar and Communication: A Survey

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China Communications 2020年第1期17卷 1-27页

作者： Zhiyong Feng Zixi Fang zhiqing wei Xu Chen Zhi Quan Danna Ji Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China College of Electronic and Information Engineering Shenzhen UniversityShenzhen 518060China

Joint radar and communication(JRC)technology has become important for civil and military applications for *** paper introduces the concepts,characteristics and advantages of JRC technology,presenting the typical applications that have benefited from JRC technology currently and in the *** paper explores the state-of-the-art of JRC in the levels of coexistence,cooperation,co-design and *** to previous surveys,this paper reviews the entire trends that drive the development of radar sensing and wireless communication using ***,we explore an open research issue on radar and communication operating with mutual benefits based on collaboration,which represents the fourth stage of JRC *** paper provides useful perspectives for future researches of JRC technology.

关键词： joint radar and communication system integration survey collaboration 5G/B5G

SELECTED PAPERS FROM IEEE/CIC ICCC 2018

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China Communications 2019年第9期16卷 15-17页

作者： Zhiyong Feng Shuguang Cui T. Aaron Gulliver zhiqing wei BUPT Beijing Peoples R China Stanford Univ Elect Engn Stanford CA 94305 USA Univ Victoria Elect Engn Victoria BC Canada Carleton Univ Acad Appointments Ottawa ON Canada Univ Canterbury Christchurch New Zealand

IEEE/CIC International Conference on Communication in China(ICCC)is one of the flagship conferences in Asian-Pacific region held by IEEE Communication Society(ComSoc)and China Institute of Communication(CIC).IEEE/CIC ICCC 2018 was held in Beijing,China,on August 16-18,*** key theme is“Ubiquitous Network,Intelligence and Society”,which broadly covers the theoretical and practical innovations in the area of *** technical program of IEEE/CIC ICCC 2018 features 6 world-class keynote speeches which are presented by weihua Zhuang(Fellow of IEEE,Royal Society of Canada,Canadian Academy of Engineering,and Engineering Institute of Canada),Abbas Jamalipour(Fellow of IEEE,IEICE,and Institution of Engineers Australia),Tao Zhang,Ying-Chang Liang(IEEE Fellow),James Kimery,and Sumei Sun(IEEE Fellow).

关键词： Canada Intelligence Institution

Sensing and Communication Integrated Fast Neighbor Discovery for UAV Networks

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ZTE Communications 2024年第3期22卷 69-82页

作者： wei zhiqing ZHANG Yongji JI Danna LI Chenfei Beijing University of Posts and Telecommunications Beijing 100876China

In unmanned aerial vehicle(UAV)networks,the high mobility of nodes leads to frequent changes in network topology,which brings challenges to the neighbor discovery(ND)for UAV *** sensing and communication(ISAC),as an emerging technology in 6G mobile networks,has shown great potential in improving communication performance with the assistance of sensing *** obtains the prior information about node distribution,reducing the ND ***,the prior information obtained through ISAC may be ***,an ND algorithm based on reinforcement learning is *** learning automaton(LA)is applied to interact with the environment and continuously adjust the probability of selecting beams to accelerate the convergence speed of ND ***,an efficient ND algorithm in the neighbor maintenance phase is designed,which applies the Kalman filter to predict node *** results show that the LA-based ND algorithm reduces the ND time by up to 32%compared with the Scan-Based Algorithm(SBA),which proves the efficiency of the proposed ND algorithms.

关键词： unmanned aerial vehicle networks neighbor discovery integrated sensing and communication reinforcement learning Kalman filter

Sensing-Assisted Accurate and Fast Beam Management for Cellular-Connected mmWave UAV Network

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China Communications 2024年第6期21卷 271-289页

作者： Cui Yanpeng Zhang Qixun Feng Zhiyong Qin Wen Zhou Ying wei zhiqing Zhang Ping School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China School of Computer Science Northwestern Polytechnical UniversityXi’an 710072China

Beam management,including initial access(IA)and beam tracking,is essential to the millimeter-wave Unmanned Aerial Vehicle(UAV)***,the conventional communicationonly and feedback-based schemes suffer a high delay and low accuracy of beam alignment,since they only enable the receiver to passively“hear”the information of the transmitter from the radio *** paper presents a novel sensing-assisted beam management approach,the first solution that fully utilizes the information from the visual domain to improve communication *** employ both integrated sensing and communication and computer vision techniques and design an extended Kalman filtering method for beam tracking and ***,we also propose a novel dual identity association solution to distinguish multiple UAVs in dynamic ***-world experiments and numerical results show that the proposed solution outperforms the conventional methods in IA delay,association accuracy,tracking error,and communication performance.

关键词： beam management integrated sensing and communication UAV communication

Orthogonal Time Frequency Space Modulation in 6G Era

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China Communications 2023年第1期20卷 I0002-I0005页

作者： weijie Yuan zhiqing wei Jiamo Jiang Shun Zhang Jinhong Yuan Pingzhi Fan the Department of Electrical and Electronic Engineering Southern University of Science and Technology IEEE Com Soc Special Interest Group on Orthogonal Time Frequency Space (OTFS-SIG) the Beijing University of Posts and Telecommunications (BUPT) Mobile Communications Innovation Center (MCIC) China Academy of Information and Communications Technology (CAICT) the State Key Laboratory of Integrated Services Networks Xidian University the School of Electrical Engineering and Telecommunications University of New South Wales Telecommunication Group University of New South Wales the Institute of Mobile Communications Southwest Jiaotong University

Over the past decades, wireless technologies with reliable data transmissions and precise sensing ability in hostile environments are much less understood and significantly under-developed. The DD domain waveform, e.g., orthogonal time frequency space(OTFS), has been recognized globally for its great potential to achieve high-reliable communications and robust sensing performance under various channel conditions in 6G era.

关键词： wireless globally precise