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Dynamic resource allocation schemes for eMBB and URLLc services in 5G wireless networks

Intelligent and converged Networks 2022年第2期3卷 145-160页

作者： Xianghui Han Kai Xiao Ruiqi Liu Xing Liu george c.alexandropoulos Shi Jin State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055Chinaand also with the Wireless Research InstituteZTE CorporationBeijing 100029China National Mobile communications Research Laboratory Southeast UniversityNanjing 210096China Department of Informatics and Telecommunications National and Kapodistrian University of AthensAthens 15784Greece

The fifth generation(5G)of wireless networks features three core use cases,namely ultra-reliable and low latency communications(URLLc),massive machine type communications(mMTc),and enhanced mobile broadband(eMBB).These use cases co-exist in many practical scenarios and compete for the same set of time and frequency resources,resulting in a natural trade-off in their *** this paper,a network supporting both URLLc and eMBB modes of operation is *** guarantee the ultra low latency requirement of URLLc,a dynamic resource allocation scheme indicated by a two-dimensional bitmap is *** approach is capable to achieve finer granularity as well as lower false cancellation rate compared to the state-of-the-art methods.A novel power control and indication method is also proposed to dynamically provide different power control parameters to the user equipment(UE),while guaranteeing the reliability requirement of URLLc and minimizing the impact to *** addition,we devise a dynamic selection mechanism(DSM)to accommodate diverse scenarios,which is empowered with load prediction to become more *** extensive system-level simulation results for eMBB-URLLc co-existence scenarios showcase that the perceived throughput of eMBB UEs is increased by 45.3%,while about 13.3% more UEs are enjoying URLLc services with at most 84% transmit power savings compared to the state-of-the-art methods.

关键词： the fifth generation(5G) co-existence enhanced mobile broadband(eMBB) multiplexing resource allocation power control ultra-reliable and low latency communications(URLLc) uplink

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Reconfiguring wireless environments via intelligent surfaces for 6G: reflection, modulation, and security

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Science china(Information Sciences) 2023年第3期66卷 60-79页

作者： Jindan XU chau YUEN chongwen HUANG Naveed UL HASSAN george c.alexandropoulos Marco DI RENZO Mérouane DEBBAH Engineering Product Development Pillar Singapore University of Technology and Design college of Information Science and Electronic Engineering Zhejiang University Department of Electrical Engineering Lahore University of Management Sciences Department of Informatics and Telecommunications National and Kapodistrian University of Athens Technology Innovation Institute Université Paris-Saclay CNRS Centrale Supélec Laboratoire des Signaux et Systèmes

The reconfigurable intelligent surface(RIS) has been recognized as an essential enabling technology for sixth-generation(6G) mobile communication networks. An RIS comprises a large number of small and low-cost reflecting elements whose parameters can be dynamically adjusted with a programmable *** of these elements can effectively reflect a phase-shifted version of the incident electromagnetic wave. By configuring the wave phases in real time, the propagation environment of the information-bearing signals can be dynamically manipulated to enhance communication reliability, boost transmission rate, expand cellular coverage, and strengthen communication security. In this study, we provide an overview on RIS-assisted wireless communications. Specifically, we elaborate on the state-of-the-art enabling techniques for the RIS technology as well as their corresponding substantial benefits from the perspectives of RIS reflection and RIS modulation. With these benefits, we envision the integration of RISs into emerging applications for6G. In addition, communication security is of unprecedented importance in future 6G networks with ubiquitous wireless services in multifarious verticals and areas. We highlight potential contributions of RISs to physical-layer security, in terms of secrecy rate and secrecy outage probability, exemplified by a typical case study from both theoretical and numerical aspects. Finally, we discuss challenges and opportunities on the deployment of RISs in practice to motivate future research.

关键词： reconfigurable intelligent surface physical-layer security RIS-assisted wireless communications phase modulation 6G

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Reconfigurable intelligent surfaces for wireless communications:Overview of hardware designs,channel models,and estimation techniques

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Intelligent and converged Networks 2022年第1期3卷 1-32页

作者： Mengnan Jian george c.alexandropoulos Ertugrul Basar chongwen Huang Ruiqi Liu Yuanwei Liu chau Yuen the Wireless Research Institute ZTE CorporationBeijing 100029China the State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055China Department of Informatics and Telecommunications National and Kapodistrian University of AthensAthens 15784Greece communications Research and Innovation Laboratory(coreLab) Department of Electrical and Electronics EngineeringKoçUniversityIstanbul 34450Turkey college of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China School of Electronic Engineering and computer Science Queen Mary University of LondonLondonE14NSUK. the Engineering Product Development(EPD)Pillar Singapore University of Technology and DesignSingapore 487372Singapore

The demanding objectives for the future sixth generation(6G)of wireless communication networks have spurred recent research efforts on novel materials and radio-frequency front-end architectures for wireless connectivity,as well as revolutionary communication and computing *** the pioneering candidate technologies for 6G belong the reconfigurable intelligent surfaces(RISs),which are artificial planar structures with integrated electronic circuits that can be programmed to manipulate the incoming electromagnetic field in a wide variety of *** RISs in wireless networks have been recently advocated as a revolutionary means to transform any wireless signal propagation environment to a dynamically programmable one,intended for various networking objectives,such as coverage extension and capacity boosting,spatiotemporal focusing with benefits in energy efficiency and secrecy,and low electromagnetic field *** by the recent increasing interests in the field of RISs and the consequent pioneering concept of the RIS-enabled smart wireless environments,in this paper,we overview and taxonomize the latest advances in RIS hardware architectures as well as the most recent developments in the modeling of RIS unit elements and RIS-empowered wireless signal *** also present a thorough overview of the channel estimation approaches for RIS-empowered communications systems,which constitute a prerequisite step for the optimized incorporation of RISs in future wireless ***,we discuss the relevance of the RIS technology in the latest wireless communication standards,and highlight the current and future standardization activities for the RIS technology and the consequent RIS-empowered wireless networking approaches.

关键词： reconfigurable intelligent surfaces beyond 5G 6G channel modeling hardware architecture channel estimation smart wireless environment standardization

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Wireless communications empowered by reconfigurable intelligent surfaces: Model-based vs model-free channel estimation

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Journal of Information and Intelligence 2023年第3期1卷 253-266页

作者： Li Wei chongwen Huang george c.alexandropoulos Ahmet M.Elbir Zhaohui Yang Zhaoyang Zhang Marco Di Renzo Merouane Debbah chau Yuen Engineering Product Development Pillar Singapore University of Technology and DesignSingapore 487372Singapore college of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China Department of Informatics and Telecommunications National and Kapodistrian University of Athens15784 AthensGreece Interdisciplinary centre for Security Reliability and TrustUniversity of LuxembourgL-4365 Esch-sur-AlzetteLuxembourgand Duzce UniversityDuzce 81620Turkey Universite Paris-Saclay CNRSCentraleSupelecLaboratoire des Signaux et Systemes91192France Khalifa University of Science and Technology Abu DhabiUnited Arab Emirates School of Electrical and Electronics Engineering Nanyang Technological UniversitySingapore 639798Singapore

Reconfigurable intelligent surfaces(RISs)are lately being attractive for their great potential in future sixth generation wireless communications(6G),which is attributed to their affordable energy consumption and easy ***,the large numbers of low-cost reflecting elements comprising RISs impose challenges for channel acquisition in various RIS-based wireless applications,such as RIS-enhanced orthogonal frequency-division multiplexing and multi-user multipleinput multiple-output *** this article,we first overview the state-of-the-art RIS hardware architectures designed to assist channel estimation for RIS-empowered wireless communication *** also overview existing channel estimation approaches,which are categorized into model-based and model-free techniques,and discuss their advantages and limitations depending on the RIS *** challenges with RIS-empowered systems in terms of hardware and other parameter limitations are presented,together with future research directions for channel estimation in RIS-based wireless systems,such as RISs with extremely large numbers of elements,multi-hop communications with RISs,and frequency division duplexing for high mobility systems.

关键词： Reconfigurable intelligent surfaces channel estimation Model-based methods Model-free methods

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Effects of interlayer spacing and applied pressure on the lanthanide transport in MoS2-based two-dimensional channels

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International Journal of Smart and Nano Materials 2024年第3期15卷 579-592页

作者： Qinsi Xiong chong Liu george c.Schatz Department of chemistry Northwestern UniversityEvanstonILUSA Pritzker School of Molecular Engineering University of ChicagoChicagoILUSA

Rare-earth elements(REEs)are critical to modern industry but difficult to separate due to their subtle and monotonic changes in physico-chemical ***2-based two-dimensional(2D)materials offer novel opportunities for enhancing REE separation,exhibiting a distinct volcano-shaped transport performance distribution that peaks at Sm3+.However,the specific contributions of thermodynamic and kinetic factors to ion transport within 2D confinement remain *** this study,we conducted a series of non-equilibrium all-atom molecular dynamics(MD)simulations to explore the effects of interlayer spacing and external pressure on the transport of lanthanide ions inÅ-scale acetate functionalized 2D MoS2(MoS2-cOOH)*** examined ion entry and permeation rates,water flux,dehydration,and binding *** simulation results reveal that the transport trends of lanthanide ions are jointly driven by the dehydration degree and the relative-binding strengths of ions to water and to the acetate within the 2D ***,the dehydration pattern of lanthanide ions during permeation is closely linked to kinetic ***,this study provides a detailed atomistic understanding of the mechanisms under-lying lanthanide ion transport under *** findings point to the significant potential for tuning confinement and chemical functionalization withinÅ-scale channels for more efficient REE separation.

关键词： MoS_(2) 2D channels Lanthanide ions ion transport nanofluidics

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Assessing the dynamics and impact of cOVID-19 vaccination on disease spread:A data-driven approach

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Infectious Disease Modelling 2024年第2期9卷 527-556页

作者： Farhad Waseel george Streftaris Bhuvendhraa Rudrusamy Sarat c.Dass School of Mathematical and computer Sciences Heriot-Watt University MalaysiaPutrajayaMalaysia School of Mathematical and computer Sciences Heriot-Watt UniversityEdinburghUnited Kingdom School of Engineering and Physical Sciences Heriot-Watt University MalaysiaPutrajayaMalaysia Maxwell Institute for Mathematical Sciences United Kingdom Faculty of Mathematics Kabul UniversityKabulAfghanistan

The cOVID-19 pandemic has significantly impacted global health,social,and economic situations since its emergence in December *** primary focus of this study is to propose a distinct vaccination policy and assess its impact on controlling cOVID-19 transmission in Malaysia using a Bayesian data-driven approach,concentrating on the year *** employ a compartmental Susceptible-Exposed-Infected-Recovered-Vaccinated(SEIRV)model,incorporating a time-varying transmission rate and a data-driven method for its estimation through an Exploratory Data Analysis(EDA)*** no vaccine guarantees total immunity against the disease,and vaccine immunity wanes over time,it is critical to include and accurately estimate vaccine efficacy,as well as a constant vaccine immunity decay or wane factor,to better simulate the dynamics of vaccine-induced protection over *** on the distribution and effectiveness of vaccines,we integrated a data-driven estimation of vaccine efficacy,calculated at 75%for Malaysia,underscoring the model's realism and relevance to the specific context of the *** Bayesian inference framework is used to assimilate various data sources and account for underlying uncertainties in model *** model is fitted to real-world data from Malaysia to analyze disease spread trends and evaluate the effectiveness of our proposed vaccination *** findings reveal that this distinct vaccination policy,which emphasizes an accelerated vaccination rate during the initial stages of the program,is highly effective in mitigating the spread of cOVID-19 and substantially reducing the pandemic peak and new *** study found that vaccinating 57–66%of the population(as opposed to 76%in the real data)with a better vaccination policy such as proposed here is able to significantly reduce the number of new infections and ultimately reduce the costs associated with new *** study contributes to the development of a robust and informati

关键词： Bayesian inference SEIRV cOVID-19 Vaccination policy Importance sampling Malaysia Data-driven

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Secure smart contract-based digital twins for the Internet of Things

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Blockchain(Research and Applications) 2024年第1期5卷 39-49页

作者： Iakovos Pittaras Nikos Fotiou christos Karapapas Vasilios A.Siris george c.Polyzos Mobile Multimedia Laboratory Department of InformaticsSchool of Information Sciences and TechnologyAthens University of Economics and BusinessAthens10434Greece School of Data Science The Chinese University of Hong KongShenzhen518172China

The proliferation of Internet of Things(IoT)devices that operate unattended providing a multitude of important and often sensitive services highlights the need for seamless interoperability and increased *** argue that digital twins of IoT devices,with the right design,can enhance the security,reliability,auditability,and interoperability of IoT *** salient features of digital twins have made them key elements for the IoT and Industry *** this paper,we leverage advances in W3c’s Web of Things(WoT)standards and distributed ledger technologies(DLTs)to present a novel design of the smart contract-based digital twins with enhanced security,transparency,interoperability,and *** provide two different variations of that general design using two different blockchains(one public and one private,permissioned blockchain),and we present design ***,we introduce an architecture for accessing and controlling IoT devices securely and reliably,providing full auditability,while at the same time using the proposed digital twins as an indirection mechanism(proxy).The proposed architecture leverages the blockchain to offer notable properties,namely,decentralization,immutability,auditability,non-repudiation,availability,and ***,it introduces mass actuation,easier management of IoT devices,and enhanced security to the IoT gateways,enables new business models,and makes consumer devices(vendor-)agnostic.

关键词： Digital twins Internet of Things Web of Things Distributed ledger technologies Hyperledger Fabric Ethereum

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Flexible ultra-thin super-resolution endoscopy

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Science china(Physics,Mechanics & Astronomy) 2024年第3期67卷 171-172页

作者： george S.D.Gordon Department of Electrical and Electronic Engineering University of NottinghamNottingham NG7 2RDUK

In recent years, multimode fiber(MMF) has become an important tool for high-resolution endoscopic imaging in narrow channels(e.g., in the brain via needles or inside blood vessels) due to its high mode density and fine diameter, typically cle to widespread deployment in applications is that realistic perturbations, including bending, twisting and changes in temperature, cause unacceptable image degradation.

关键词： fiber resolution typically

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Unique Genetic Features of Lean NAFLD: A Review of Mechanisms and clinical Implications

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Journal of clinical and Translational Hepatology 2024年第1期12卷 70-78页

作者： Jasmine Tidwell george Y.Wu Department of Medicine University of Connecticut Health CenterFarmingtonCTUSA Division of Gastroenterology-Hepatology University of Connecticut Health CenterFarmingtonCTUSA

Non-alcoholic fatty liver disease(NAFLD)affects 25%of the global *** 20%have a normal body mass index(BMI)and a variant known as lean *** typical NAFLD cases associated with obesity and diabetes,lean NAFLD causes liver disease by mechanisms not related to excess weight or insulin *** disorders are among the major factors in developing lean NAFLD,and genome-wide association studies have identified several genes associated with the *** review aims to increase awareness by describing the genetic markers linked to NAFLD and the defects involved in developing lean NAFLD.

关键词： Lean nonalcoholic fatty liver disease Palatine-like phospholipase domain-containing-3 Transmembrane 6 superfamily member 2 Familial hypobetalipoproteinemia Abetalipoproteinemia

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Heritable chronic cholestatic Liver Diseases:A Review

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Journal of clinical and Translational Hepatology 2024年第8期12卷 726-738页

chronic cholestasis due to heritable causes is usually diagnosedin ***,many cases can present andsurvive into *** time course varies considerablydepending on the underlying *** data usuallyreveal elevated conjugated hyperbilirubinemia,alkalinephosphatase,and gamma-glutamyl *** be asymptomatic;however,when present,the typicalsymptoms are pruritus,jaundice,fatigue,and *** diagnostic methods and management requireddepend on the underlying *** development of genome-wide associated studies has allowed the identificationof specific genetic mutations related to the pathophysiologyof cholestatic liver *** aim of this review was tohighlight the genetics,clinical pathophysiology,presentation,diagnosis,and treatment of heritable etiologies of chroniccholestatic liver disease.

关键词： chronic cholestasis cholestatic liver disease congenital hepatic fibrosis caroli disease caroli syndrome Alagille syndrome Biliary atresia

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