Gotowe bibliografie tematyczne / Communications 5G

Gotowa bibliografia na temat „Communications 5G”

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Data publikacji: 25 maja 2024

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Artykuły w czasopismach na temat "Communications 5G"

Choi, Young B., i Matthew E. Bunn. "The Security Risks and Challenges of 5G Communications". International Journal of Cyber Research and Education 3, nr 2 (lipiec 2021): 46–53. http://dx.doi.org/10.4018/ijcre.2021070104.

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With the introduction of the 5th generation of wireless systems and communications (5G) comes new risks and challenges. This paper explores the potential security challenges of 5G communication compared with legacy cellular networks and prior generations of communication standards. This paper defines what 5G is and how it affects our lives on a daily basis. It further discusses the new security features involving different technologies applied to 5G, such as heterogeneous networks, device-to-device communications, massive multiple-input multiple-output, software-defined networks, and the internet of things, including autonomous cars, healthcare, automated manufacturing, and more.

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Manale, Boughanja, i Tomader Mazri. "Security of communication 5G-V2X: A proposed approach based on securing 5G-V2X based on Blockchain". ITM Web of Conferences 43 (2022): 01025. http://dx.doi.org/10.1051/itmconf/20224301025.

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With the rapid evolution of wireless communication and autonomous vehicles, vehicle to Everything (V2X) communications provides driving safety, traffic efficiency, and real-time traffic information in-vehicle networks. V2X has evolved by integrating 5G cellular access technology and New Radio (NR) into V2X communications (i.e., 5G NR V2X). Since the security issue in 5G-V2X remains a crucial point, we conducted a literature review approach and identified the 5G-V2X communication levels in this paper. The main objective of this study was to develop an approach to secure 5G-V2X. The proposed methodology is based on Blockchain to ensure the 5G-V2X architecture levels.

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Shah, Syed Adeel Ali, Ejaz Ahmed, Muhammad Imran i Sherali Zeadally. "5G for Vehicular Communications". IEEE Communications Magazine 56, nr 1 (styczeń 2018): 111–17. http://dx.doi.org/10.1109/mcom.2018.1700467.

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Demestichas, Konstantinos, Evgenia Adamopoulou i Michał Choraś. "5G Communications: Energy Efficiency". Mobile Information Systems 2017 (2017): 1–3. http://dx.doi.org/10.1155/2017/5121302.

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Bhardwaj, Anshu. "5G for Military Communications". Procedia Computer Science 171 (2020): 2665–74. http://dx.doi.org/10.1016/j.procs.2020.04.289.

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Boeding, Matthew, Paul Scalise, Michael Hempel, Hamid Sharif i Juan Lopez. "Toward Wireless Smart Grid Communications: An Evaluation of Protocol Latencies in an Open-Source 5G Testbed". Energies 17, nr 2 (11.01.2024): 373. http://dx.doi.org/10.3390/en17020373.

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Fifth-generation networks promise wide availability of wireless communication with inherent security features. The 5G standards also outline access for different applications requiring low latency, machine-to-machine communication, or mobile broadband. These networks can be advantageous to numerous applications that require widespread and diverse communications. One such application is found in smart grids. Smart grid networks, and Operational Technology (OT) networks in general, utilize a variety of communication protocols for low-latency control, data monitoring, and reporting at every level. Transitioning these network communications from wired Wide Area Networks (WANs) to wireless communication through 5G can provide additional benefits to their security and network configurability. However, introducing these wireless capabilities may also result in a degradation of network latency. In this paper, we propose utilizing 5G for smart grid communications, and we evaluate the latency impacts of encapsulating GOOSE, Modbus, and DNP3 for transmission over a 5G network. The OpenAirInterface open-source library is utilized to deploy an in-lab 5G Core Network and gNB for testing with off-the-shelf User Equipment (UE). This creates an effective 5G test platform for experimenting with different OT protocols such as GOOSE. The results are validated by measuring two different Intelligent Electronic Devices’ contact closure times for each network configuration. These tests are also conducted for varying packet sizes in order to isolate different sources of network latency. Our study outlines the latency impact of communication over 5G for time-critical and non-critical applications regarding their transition toward private 5G-based OT network implementations. The conducted experiments illustrate that in the case of GOOSE packets, simple encapsulation may exceed the protocol’s time-critical nature, and, therefore, additional measures must be taken to ensure a viable transition of GOOSE to 5G services. However, non-critical applications are shown to be viable for migration to 5G.

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Hameed, Nazia, i Dr Vipin Gupta. "Future Antenna for 5G Mobile Communications". International Journal of Trend in Scientific Research and Development Volume-2, Issue-6 (31.10.2018): 982–85. http://dx.doi.org/10.31142/ijtsrd18820.

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Chih-Lin, I., Shuangfeng Han, Zhikun Xu, Qi Sun i Zhengang Pan. "5G: rethink mobile communications for 2020+". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, nr 2062 (6.03.2016): 20140432. http://dx.doi.org/10.1098/rsta.2014.0432.

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The 5G network is anticipated to meet the challenging requirements of mobile traffic in the 2020s, which are characterized by super high data rate, low latency, high mobility, high energy efficiency and high traffic density. This paper provides an overview of China Mobile’s 5G vision and potential solutions. Three key characteristics of 5G are analysed, i.e. super fast, soft and green. The main 5G R&D themes are further elaborated, which include five fundamental rethinkings of the traditional design methodologies. The 5G network design considerations are also discussed, with cloud radio access network, ultra-dense network, software defined network and network function virtualization examined as key potential solutions towards a green and soft 5G network. The paradigm shift to user-centric network operation from the traditional cell-centric operation is also investigated, where the decoupled downlink and uplink, control and data, and adaptive multiple connections provide sufficient means to achieve a user-centric 5G network with ‘no more cells’. The software defined air interface is investigated under a uniform framework and can adaptively adapt the parameters to well satisfy various requirements in different 5G scenarios.

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Abdullayeva, A. S., A. K. Aitim i A. V. Tyan. "ПЕРЕХОД СЕТИ 4G НА 5G. ИННОВАЦИОННЫЙ ПОТЕНЦИАЛ ЭКОСИСТЕМЫ 5G". INTERNATIONAL JOURNAL OF INFORMATION AND COMMUNICATION TECHNOLOGIES 3, nr 2(10) (15.06.2022): 47–58. http://dx.doi.org/10.54309/ijict.2022.10.2.005.

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This article is based on an analysis of the new generation of 5G network. The smooth transition from the fourth generation to the fifth and the need for a 5G network for connection and data transmission are considered. Also, the impact of the new generation network on the global economy. Transition problems and technical needs for network implementation are analyzed. Everyday products and communications, whether images, audio, or video, are increasingly dependent on high-speed, 24/7 Internet connections. To keep up with the ever-increasing demand, the 5th generation of wireless network technology was introduced; better known as 5G. Perseverance in technological innovation contributes to a timely economic recovery and will continue to promote prosperity in the post-pandemic era. 5G advances mobile communications from connecting people to people and people to information to a single communication network connecting everyone and everything. This paper examines the evolution and rise of wireless technologies of all generations, highlights the importance of revolutionary 5G networks, examines the main technologies that make it possible to apply them, explores their trends and challenges, explores their applications in various industrial sectors.

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Zu, Chenyu. "An investigation on fronthaul and millimeter wave technologies for 5G". Journal of Physics: Conference Series 2132, nr 1 (1.12.2021): 012037. http://dx.doi.org/10.1088/1742-6596/2132/1/012037.

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Abstract Abstract.The growing demand for communications and the emergence of new applications have put the capacity, transmission rate and latency of communications systems to a more severe test. In this context, 5G communication technology has emerged. 5G applications are divided into three typical application scenarios: eMBB, URLLC and mMTC. In order to support these applications, the key technologies of 5G need to be studied in depth. This paper firstly investigates the networking architecture of 5G bearer networks, and carries out a detailed analysis and comparison of 5G fronthaul technology, including the optical fibre direct connection solution, passive WDM solution, active WDM/OTN solution and WDM-PON solution. Secondly, this paper introduces 5G millimetre wave technology to achieve large capacity and high spectral efficiency transmission, including direct intensity modulation method, external modulation method, optical heterodyne method, optical injection locking method and optical phase-locked loop method. Finally, this paper provides an outlook on 5G fronthaul technology and millimetre wave technology.

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Rozprawy doktorskie na temat "Communications 5G"

Artusi, Denise. "5g mobile communications systems". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7563/.

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Un sistema mobile di comunicazione è un sistema di telecomunicazioni in cui è possibile mantenere la connessione o legame tra due o più utenti, anche nelle situazioni di mobilità totale o parziale degli stessi utenti. I sistemi radiomobili si stanno evolvendo dalla creazione del 1G (prima generazione) al 4G (quarta generazione). I telefoni di ogni generazione si differenziano in quattro aspetti principali : accesso radio, velocità di trasmissione dati, larghezza di banda e sistemi di commutazione. In questa tesi si affronta il tema dei sistemi 5G , negli ambienti terrestri e satellitari , in quanto sono l'ultima evoluzione dei sistemi mobili . Si introduce il passaggio dalla prima alla connessione di quarta generazione , al fine di capire perché 5G sta per cambiare la nostra vita . Quello che mi colpisce è il sito italiano www.Repubblica.it che dice : " con la nuova generazione 5 possiamo affidare le intere porzioni nette di vita". La tecnologia cellulare , infatti , ha cambiato radicalmente la nostra società e il nostro modo di comunicare . In primo luogo è cambiata la telefonia vocale , per poi trasferirsi all' accesso dati , applicazioni e servizi. Tuttavia , Internet non è stato ancora pienamente sfruttato dai sistemi cellulari. Con l'avvento del 5G avremo l'opportunità di scavalcare le capacità attuali di Internet . Il sistema di comunicazione di quinta generazione è visto come la rete wireless reale , in grado di supportare applicazioni web wireless a livello mondiale ( wwww ). Ci sono due punti di vista dei sistemi 5G : evolutivo e rivoluzionario. Dal punto di vista evolutivo, i sistemi 5G saranno in grado di supportare wwww permettendo una rete altamente flessibile come un Adhoc rete wireless dinamica ( DAWN ) . In questa visione tecnologie avanzate, tra cui antenna intelligente e modulazione flessibile , sono le chiavi per ottimizzare le reti wireless ad hoc. Dal punto di vista rivoluzionario, i sistemi 5G dovrebbe essere una tecnologia intelligente in grado di interconnettere tutto il mondo senza limiti . Un esempio di applicazione potrebbe essere un robot wireless con intelligenza artificiale .

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Gopala, Kalyana. "Multiple Antenna Communications for 5G". Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS352.

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Duplexage par division dans le temps (TDD) Massive Multiple Input Multiple Output (MaMIMO) dépend de la réciprocité de canal pour obtenir des informations d'état de canal au niveau de l'émetteur (CSIT). Toutefois, le canal numérique global de bout en bout n’est pas réciproque en raison de la présence de chaînes de transmission (Tx) et de réception (Rx), qui doivent être corrigées à l’aide de facteurs de calibration. Nous fournissons une expression simple et élégante du Cramér-Rao Bound (CRB) pour l’estimation des paramètres de calibration. Nous analysons des approches des moindres carrés existants et proposons des algorithmes optimaux. Nous considérons également la beamforming pour une liaison MIMO point à point variant rapidement dans le temps. Dans un système Orthogonal Frequency Division Multiplexing (OFDM), il en résulte une interférence entre porteuses (ICI). Avec une hypothèse de variation linéaire de canal à travers le symbole OFDM, il a été observé que le problème est similaire à celui d'une conception de beamformer MIMO par canal de diffusion à interférence (IBC). Le design du beamformer prend en compte le fenêtrage de réception en utilisant le préfixe cyclique en excès. En plus de la CSIT complète, nous étudions également des approches qui maximisent le Expected Weighted Sum Rate (EWSR) lorsque la Tx n’a qu’une connaissance partielle du canal. Premièrement, nous utilisons une approximation de système large qui fonctionne également bien pour un petit nombre d’antennes Tx et Rx. Nous analysons également la possibilité d’utiliser la métrique Expected-signal-expected-interference-WSR de signal EWSR. Enfin, les résultats expérimentaux sont présentés
Time Division Duplexing (TDD) Massive Multiple Input Multiple Output (MaMIMO) with a massive number of base station (BS) antennas relies on channel reciprocity to obtain Channel State Information at Transmitter (CSIT). However the overall end to end digital channel is not reciprocal due to the presence of Transmit (Tx) and Receive (Rx) chains which need to be corrected using calibration factors. Our work provides a simple and elegant expression of the Cramer Rao Bound (CRB) for calibration parameter estimation. We provide analysis for the existing least squares approaches and propose optimal algorithms to estimate the calibration parameters. We also consider beamforming for a rapidly time-varying point to point MIMO link. In an Orthogonal Frequency Division Multiplexing (OFDM) sytem, this results in inter-carrier interference (ICI). With an assumption of linear channel variation across the OFDM symbol, it is observed that the beamformer design problem is similar to that of a MIMO Interfering Broadcast Channel (IBC) beamforming design. The beamformer design takes into account receive windowing using the excess cyclic prefix and the window is jointly designed with the Tx beamformer. In addition to full CSIT, we also investigate partial CSIT approaches that maximize Expected Weighted Sum Rate (EWSR) where the Tx has only partial knowledge of the channel. First, we use a large system approximation that also works well for a small number of Tx and Rx antennas to derive the beamformers. In our work, we also analyze the possibility of using the Expected-signal- expected-interference-WSR metric instead of the EWSR. Finally, experimental results on the Eurecom MaMIMO testbed are presented

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Nguyen, Tran Quang Khai. "Développement de système antennaire pour les communications 5G". Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4100.

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Ce travail de thèse a été financé par le projet FUI Mass-Start (2017-2020). Le projet ambitionne de développer une solution open source 5G pour le MIMO Massif. L’objectif est le développement d’une plateforme Hardware et Software, sur le principe du succès d’OAI en 4G (www.openairinterface.org). Les principaux livrables matériels du projet sont les sous-systèmes radio et de traitement de bande de base compatibles 5G, leur intégration dans un démonstrateur de terminal 5G basé sur OAI et le réseau d’antennes permettant les expérimentations de bout en bout du lien MIMO Massif. L'objectif de la thèse est le développement et la mesure de système antennaires qui seront utilisés dans le projet.Sur la bande 5G FR1, le travail s'est concentré sur le développement d'une méthodologie de conception antennaire combinant circuit d'adaptation et optimisation géométrique. Les contraintes en bande passante sont évaluées à partir du facteur de qualité des antennes. Le prototype final démontre qu'un système non-résonnant permet de couvrir la plupart des bandes de téléphonie mobile 5G sous les 6GHz en respectant des contraintes d'intégration très forte.Sur la bande 5G FR2, et plus précisément sur la bande n258 Européenne, différents types d'architecture d'antennes réseau ont été évalués et mesuré. La thèse s'est particulièrement concentrée sur la co-conception entre les antennes et les modules électroniques sur une technologie PCB.Les solutions proposées ont été utilisées pour quantifier et modéliser l'effet du corps humain, et plus particulièrement de la main, sur les performances sur réseau antennaire. Enfin, une solution basée sur plusieurs réseaux distribués sur un téléphone montre une meilleure robustesse aux effets de blocage du corps humain
The work in this thesis has been funded by the French FUI project MASS-START (2017-2020). The project aims at the integration of 5G compatible baseband and radio subsystems into an Over-Air-Interface-based 5G terminal and gNodeB demonstrator, and the antenna array for end-to-end Multiple Input Multiple Output link experimentation. The scope of the thesis concerns the design and assessment of antenna systems that are to be used in the project.At 5G Frequency Range 1 band, the work concentrates on the development of a methodology to design antenna with a matching circuit for mobile terminals with limited area. The bandwidth limitation is evaluated using Quality-Factor. A Particle Swarm Optimization algorithm is proposed and examined in different antenna designs for mobile terminals. The final design demonstrates a system with three non-resonating coupling elements covering most of the sub-6GHz bands of 5G. At 5G Frequency Range 2 band, more precisely band n258 of Europe, different types of array antennas are studied. The work first checks two types of feeding for a patch antenna that can be integrated into Printed Circuit Board to have a low profile antenna and ease the fabrication procedure. The designs are later fabricated and experimentally evaluated. With a Millimeter-Wave array at hand, we proceed a measurement campaign in which the effects of the user's finger at close proximity of the antenna are evaluated. The losses due to absorption, reflection, diffraction are quantified and compared with numerical estimations in literature. A system of multiple end-fire arrays placed at different locations in a terminal is also studied showing the compromising effectiveness if one array is severely blocked

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Nguyen, Thanh-Son-Lam. "Wireless Resource Allocation in 5G-NR V2V Communications". Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASG052.

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Cette thèse doctorale explore l'amélioration de l'allocation des ressources sans fil dans les communications Vehicle-to-Everything (V2X), selon la norme 3GPP Release 16. Le domaine spécifique de notre recherche est la communication NR-V2X Sidelink, également connue sous le nom de communication New Radio-Vehicles to Vehicles (NR-V2V). Notre objectif est de formuler un nouveau protocole d'optimisation qui garantit non seulement des services de haute qualité (QoS) mais surpasse également les méthodologies existantes dans la communication NR-V2V.Tout d'abord, nous introduisons la Configuration Physique Adaptative (APC), un algorithme basé sur la recherche conçu pour identifier la configuration optimale de la couche physique à l'intérieur d'un ensemble de facteurs environnementaux, spécifiquement adaptée pour un schéma de communication de diffusion. Suite à cela, nous faisons évoluer l'APC vers une variante sensible à la radio (RA-APC), élargissant son champ d'action en incorporant une communication en unicast et en établissant une structure plus flexible pour les ressources PHY. Dans la phase finale, nous affinons encore RA-APC en intégrant un algorithme d'apprentissage automatique, spécifiquement un arbre de décision. Cette intégration met à jour les schémas au sein des facteurs d'entrée, augmentant ainsi à la fois la précision et l'efficacité du processus d'optimisation de l'allocation
This doctoral dissertation explores the enhancement of wireless resource allocation in Vehicle-to-Everything (V2X) communications, as specified by the 3GPP Release 16 standard. The specific area of our research is the NR-V2X Sidelink communication, also known as the New Radio-Vehicles to Vehicles (NR-V2V) communication. Our goal is to formulate a novel optimization protocol that not only guarantees high-quality services (QoS) but also outperforms existing methodologies in NR-V2V communication.Initially, we introduce Adaptive Physical Configuration (APC), a search-based algorithm designed to identify the optimal physical layer configuration within a set of environmental factors, specifically tailored for a broadcast communication scheme. Following this, we evolve APC into a Radio Aware variant (RA-APC), broadening its scope by incorporating unicast communication and establishing a more flexible structure for PHY resources. In the final phase, we further refine RA-APC by integrating a machine learning algorithm, specifically a decision tree. This integration uncovers patterns within the input factors, thereby augmenting both the accuracy and efficiency of the allocation optimization process

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Torabian, Esfahani Tahmineh, i Stefanos Stefanidis. "High Performance Reference Crystal Oscillator for 5G mmW Communications". Thesis, Linköpings universitet, Elektroniska komponenter, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112568.

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Future wireless communications (often referred to as 5G) are expected to operate at much higher frequencies compared to today’s wireless systems. During this thesis, we have investigated the option to use high frequency crystal oscillators, which along with a PLL, will generate the RF LO signal in the mmW range. Different topologies that consume low power and deliver low phase noise for better channel capacity have been studied and presented. In this report we provide a detailed analysis of crystal oscillator theory and designand we discuss techniques that we have used to simulate our models. During this project we have encountered various challenges such as parasitic oscillation, start-up behaviour and effects from package modeling. All these issues are discussed in detail while solutions, examples and results are demonstrated. Finally, along with the crystal oscillator we have also proceeded in the design of a buffer for a better input/output isolation. A squarer has been implemented for greater power savings.

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Vlachos, Christoforos. "Integrating device-to-device communications in 5G cellular networks". Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/integrating-devicetodevice-communications-in-5g-cellular-networks(b4700367-dfd1-41df-b880-651bdb3b0b7b).html.

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The evolution of wireless networks towards 5G dictates the integration of a mul-titude of heterogeneous radio access technologies to the traditional macro-cell systems. Equipping the network with numerous small cell nodes, such as fem-tocell and picocell base stations (BSs), implies a spectrum efficient and network performance improving solution to support the rapidly increasing user demands. However, this can be proven to be a cost-inefficient method that increases the capital and operational expenditures of the network operators as well as the power consumption, especially in low-traffic network conditions where a number of BSs should be switched-off. To this end, device-centric solutions that leverage the potentials stemming from the proximity, mobility and increased dynamics of user devices should be considered. To this end, direct, proximity-based Device-to-Device (D2D) communication, where two close-ranged user equipments (UEs) are able to exchange data by bypassing the BS, is expected to play predominant role in improving the overall network welfare and ease part of the traffic developed on the BSs side. This thesis focuses on the soft integration of inband D2D communications in emerging cellular networks where D2D-enabled devices utilize the licensed spec-trum. In the introductory part of the thesis we highlight the merits that this communication paradigm can offer in terms of spectrum utilization, energy sav-ing, delay reduction and data rate improvement. We also provide an overview of the D2D use cases that enable opportunities for new services, its potential in improving the overall network performance as well as its offloading capability that can ease the traffic employed along the network. In the sequel, we proceed with our proposed methodology that aims at easing the coexistence of cellular and D2D users in emerging cellular networks. One of the main contributions of the thesis is the optimization of cell association for D2D UEs (DUEs). Cell association for D2D communications is an unexplored area and a rather fertile ground for research. Following the conventional motif, a user device would preferably couple with a high power macro cell BS that provides the user with the highest signal power. However, with the advent of D2D com-munications, this could be proven to be highly inefficient for users that want to communicate directly and are associated with different BSs because BS intercom-munication complexity and access delay is introduced. To this end, we propose a number of optimization formulations for D2D-based cell association that takes into consideration not only the nature of the inband D2D communications (un-derlay or overlay), but also performance-hindering factors such as user density, interference and so on. Other than the throughput enhancing and power saving attributes of the proposed framework, notable resource efficiency improvement is achieved. Indicatively, for both underlay and overlay D2D communications, more than 12% and 45% radio resource utilization mitigation is ensured compared to baseline methods. On top of optimizing cell association for D2D communications, we further investigate the problem of resource allocation in different D2D underlaying cellu-lar network scenarios where DUEs are permitted to reuse the cellular resources and, therefore, high levels of interference need to be prevented. By consider-ing different deployment scenarios, we propose a set of low-complexity heuristic algorithms with the aim to achieve high data rate performance for D2D com-munications with respect to meeting the cellular users’ quality of service (QoS) requirements. The proposed algorithms are evaluated in high-traffic networking scenarios where D2D communications underlay relay-enabled cellular networks. In aggregate, more than 10% of sum throughput performance is achieved against various resource allocation techniques. In the sequel, we explore the dynamics of virtualizing the radio resources for efficient sharing as, nowadays, we are witnessing higher network heterogeneity and the emergence of multiple stakeholders with the overarching need to significantly reduce deployment costs and achieve a sustainable network operation. Network virtualization has emerged as a promising technique to overcome the complexity of current network operation as well as facilitate inter-operators’ sharing. There-fore, disruptive approaches to manage radio and network-virtualized resources are expected to be a catalyst element of future mobile network architectures. Despite the fact that a number of solutions for radio access network (RAN) virtualization emerged over the last few years, it is worth pointing out that little attention has been placed on issues related to D2D virtualization. Therefore, based on the integration of an inter-tenant controller that enables the radio resource sharing between multiple operators, we devise a set of efficient algorithms to optimize the throughput performance of D2D communications in virtualized environments as well as reduce the utilization levels of the allocated radio resources. More than 12% of sum-rate performance improvement compared to legacy, intra-tenant ap-proaches where the radio resources are assigned based on which device initiates the communication per case. Finally, a summary of the research outcomes along with some future directions for D2D communications concludes this thesis.

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Özenir, Onur. "Redundancy techniques for 5G Ultra Reliable Low Latency Communications". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25082/.

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The 5G Core Network architecture is modeled to include instruments that can establish networks built on the same physical infrastructure but serve different service categories for communication types with varying characteristics. Relying on virtualization and cloud technologies, these instruments make the 5G system different from previous mobile communication systems, change the user profile, and allow new business models to be included in the system. The subject of this thesis includes the study of Ultra-reliable low latency communication, which is one of the fundamental service categories defined for the 5G system, and the analysis of the techniques presented in 3GPP’s Release 16, which enhance the service parameters by modifying the core network. In the theoretical part, the 5G system and URLLC are introduced with a particular focus on the user plane on the core network. In the implementation part, redundant transmission support on the N3 interface, one of the techniques presented in the technical specification, is modeled using open source software tools (Open5GS and UERANSIM) and network virtualization instruments. As a result of the tests and measurements performed on the model, it was observed that the implemented technique enhanced the system's reliability.

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Campestri, Mattia. "Performance Improvement of D2D Random Access in 5G Communications". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The development of fifth generation mobile networks has laid the ground for the creation of new applicative scenarios, characterized by increasingly demanding requirements. In particular, to satisfy low latency requirements, an aspect to take into account is represented by the random access procedure, performed by devices for initial connection to the network or to switch to a connected state afterwards. Because of the limited amount of resources available for random access, the presence of a high number of devices requesting access at the same time can generate congestion and require multiple access attempts, increasing latency and compromising the fulfillment of the requirements. The problem was already addressed in the scientific literature, with the proposal of a series of solutions to improve the random access procedure. This thesis work aims at enriching these efforts, by leveraging device-to-device communications and the reservation of random access resources, and by proposing a dynamic strategy to alleviate performance deterioration at runtime and intervene on the system with reconfiguration operations, in order to solve possible congestions. The studied scenarios are analyzed by means of the ns-3 network simulator, extended by the additional mmWave and MilliCar modules, for the simulation of 5G networks and device-to-device communications through the cellular sidelink. The results obtained from the simulations have the objective of demonstrating the advantages introduced by the dynamic reconfiguration strategy, and of gaining useful insights on the usage of the proposed enhancements for the random access procedure.

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DI, STASIO FRANCESCO. "Link optimization considerations for 5G and beyond wireless communications". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2950490.

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Rajabi, Khamesi Atieh. "A Stochastic Geometry approach towards Green Communications in 5G". Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3422676.

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In this dissertation, we investigate two main research directions towards net- work efficiency and green communications in heterogeneous cellular networks (HetNets) as a promising network structure for the fifth generation of mobile systems. In order to analyze the networks, we use a powerful mathematical tool, named stochastic geometry. In our research, first we study the performance of MIMO technology in single-tier and two-tier HetNets. In this work, we apply a more realistic network model in which the correlation between tiers is taken into account. Comparing the obtained results with the commonly used model shows performance enhancement and greater efficiencies in cellular networks. As the second part of our research, we apply two Cell Zooming (CZ) techniques to HetNets. With focus on green communications, we present a K−tier HetNet in which BSs are only powered by energy har- vesting. Despite the uncertain nature of energy arrivals, combining two CZ techniques, namely telescopic and ON/OFF scenarios, enables us to achieve higher network performance in terms of the coverage and blocking probabilities while reducing the total power consumption and increasing the energy and spectral efficiencies.
In this dissertation, we investigate two main research directions towards net- work efficiency and green communications in heterogeneous cellular networks (HetNets) as a promising network structure for the fifth generation of mobile systems. In order to analyze the networks, we use a powerful mathematical tool, named stochastic geometry. In our research, first we study the performance of MIMO technology in single-tier and two-tier HetNets. In this work, we apply a more realistic network model in which the correlation between tiers is taken into account. Comparing the obtained results with the commonly used model shows performance enhancement and greater efficiencies in cellular networks. As the second part of our research, we apply two Cell Zooming (CZ) techniques to HetNets. With focus on green communications, we present a K−tier HetNet in which BSs are only powered by energy har- vesting. Despite the uncertain nature of energy arrivals, combining two CZ techniques, namely telescopic and ON/OFF scenarios, enables us to achieve higher network performance in terms of the coverage and blocking probabilities while reducing the total power consumption and increasing the energy and spectral efficiencies.

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Książki na temat "Communications 5G"

Xiang, Wei, Kan Zheng i Xuemin Shen, red. 5G Mobile Communications. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-34208-5.

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Marriwala, Nikhil, C. C. Tripathi, Shruti Jain i Dinesh Kumar, red. Mobile Radio Communications and 5G Networks. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7018-3.

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Marriwala, Nikhil, C. C. Tripathi, Dinesh Kumar i Shruti Jain, red. Mobile Radio Communications and 5G Networks. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7130-5.

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Dohler, Mischa, i Takehiro Nakamura. 5G Mobile and Wireless Communications Technology. Redaktorzy Afif Osseiran, Jose F. Monserrat i Patrick Marsch. Cambridge: Cambridge University Press, 2016. http://dx.doi.org/10.1017/cbo9781316417744.

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Asif, Saad Z. 5G Mobile Communications Concepts and Technologies. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis: CRC Press, 2018. http://dx.doi.org/10.1201/9780429466342.

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Cheng, Xiang, Rongqing Zhang i Liuqing Yang. 5G-Enabled Vehicular Communications and Networking. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-02176-4.

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Wen, Miaowen, Xiang Cheng i Liuqing Yang. Index Modulation for 5G Wireless Communications. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51355-3.

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Marriwala, Nikhil, C. C. Tripathi, Shruti Jain i Dinesh Kumar, red. Mobile Radio Communications and 5G Networks. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7982-8.

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Satellite communications in the 5G Era. Stevenage: IET, 2018.

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Marriwala, Nikhil Kumar, Sunil Dhingra, Shruti Jain i Dinesh Kumar, red. Mobile Radio Communications and 5G Networks. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0700-3.

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Części książek na temat "Communications 5G"

Ratasuk, Rapeepat, Amitava Ghosh i Benny Vejlgaard. "M2M Communications". W Towards 5G, 250–74. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118979846.ch12.

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Vook, Frederick W., Amitava Ghosh i Timothy A. Thomas. "Massive MIMO Communications". W Towards 5G, 342–64. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118979846.ch15.

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Molisch, Andreas F., Mingyue Ji, Joongheon Kim, Daoud Burghal i Arash Saber Tehrani. "Device-to-Device Communications". W Towards 5G, 162–98. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118979846.ch9.

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Van Chien, Trinh, i Emil Björnson. "Massive MIMO Communications". W 5G Mobile Communications, 77–116. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34208-5_4.

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Alonso-Zarate, Jesus, i Mischa Dohler. "M2M Communications in 5G". W 5G Mobile Communications, 361–79. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34208-5_13.

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Wang, Yi, i Zhenyu Shi. "Millimeter-Wave Mobile Communications". W 5G Mobile Communications, 117–34. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34208-5_5.

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Singh, Shubhranshu, Ji Lianghai, Daniel Calabuig, David Garcia-Roger, Nurul H. Mahmood, Nuno Pratas, Tomasz Mach i Maria Carmela De Gennaro. "D2D and V2X Communications". W 5G System Design, 409–49. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119425144.ch14.

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Jiang, Dajie, i Guangyi Liu. "An Overview of 5G Requirements". W 5G Mobile Communications, 3–26. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34208-5_1.

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Darwazeh, Izzat, Ryan C. Grammenos i Tongyang Xu. "Spectrally Efficient Frequency Division Multiplexing for 5G". W 5G Mobile Communications, 261–97. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34208-5_10.

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Zhou, Mingxin, Yun Liao i Lingyang Song. "Full-Duplex Wireless Communications for 5G". W 5G Mobile Communications, 299–335. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34208-5_11.

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Streszczenia konferencji na temat "Communications 5G"

Ramabadran, Prasidh, Sidath Madhuwantha, Pavel Afanasyev, Ronan Farrell i John Dooley. "Wideband Interleaved Vector Modulators for 5G Wireless Communications". W 2018 IEEE MTT-S International Microwave Workshop Series on 5G Hardware and System Technologies (IMWS-5G). IEEE, 2018. http://dx.doi.org/10.1109/imws-5g.2018.8484496.

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Futter, P. W., i J. Soler. "Antenna design for 5g communications". W 2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2017. http://dx.doi.org/10.1109/apcap.2017.8420649.

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Rusch, Leslie Ann, Xun Guan, Mingyang Lyu i Wei Shi. "Silicon Photonics for 5G Communications". W 2020 IEEE Photonics Conference (IPC). IEEE, 2020. http://dx.doi.org/10.1109/ipc47351.2020.9252548.

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Agrawal, Anurag Vijay, i Meenakshi Rawat. "HSR Communications in 5G Era". W 2019 IEEE 16th India Council International Conference (INDICON). IEEE, 2019. http://dx.doi.org/10.1109/indicon47234.2019.9029080.

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Kourtis, Michail-Alexandros, Michael Batistatos, George Xilouris, Thanos Sarlas, Themis Anagnostopoulos, Ioannis P. Chochliouros i Anastasios Kourtis. "5G Slicing for Emergency Communications". W 2021 Eighth International Conference on Software Defined Systems (SDS). IEEE, 2021. http://dx.doi.org/10.1109/sds54264.2021.9732142.

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Chih-Lin I. "Pearls of 5G". W Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/acp.2013.aw2a.2.

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Chih-Lin, I. "Pearls of 5G". W Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/acpc.2013.aw2a.2.

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Moradi, Hussein, i Behrouz Farhang-Boroujeny. "Underlay Scheduling Request for Ultra-Reliable Low-Latency Communications". W 2019 IEEE 2nd 5G World Forum (5GWF). IEEE, 2019. http://dx.doi.org/10.1109/5gwf.2019.8911714.

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Bhatia, Randeep, Bhawna Gupta, Steven Benno, Jairo Esteban, Dragan Samardzija, Marcos Tavares i T. V. Lakshman. "Massive Machine Type Communications over 5G using Lean Protocols and Edge Proxies". W 2018 IEEE 5G World Forum (5GWF). IEEE, 2018. http://dx.doi.org/10.1109/5gwf.2018.8517086.

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Kurtz, Fabian, Dennis Overbeck, Caner Bektas i Christian Wietfeld. "Control Plane Fault Tolerance for Resilient Software-Defined Networking based Critical Infrastructure Communications". W 2018 IEEE 5G World Forum (5GWF). IEEE, 2018. http://dx.doi.org/10.1109/5gwf.2018.8516975.

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Raporty organizacyjne na temat "Communications 5G"

Cintron, Fernando J., David W. Griffith, Chunmei Liu, Richard Rouil, Yishen Sun, Jian Wang, Peng Liu, Chen Shen, Aziza Ben Mosbah i Samantha Gamboa. Study of 5G New Radio (NR) Support for Direct Mode Communications. National Institute of Standards and Technology, maj 2021. http://dx.doi.org/10.6028/nist.ir.8372.

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Al-Qadi, Imad, Yanfeng Ouyang, Eleftheria Kontou, Angeli Jayme, Noah Isserman, Lewis Lehe, Ghassan Chehab i in. Planning for Emerging Mobility: Testing and Deployment in Illinois. Illinois Center for Transportation, listopad 2023. http://dx.doi.org/10.36501/0197-9191/23-025.

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As part of planning I-ACT, this project developed plans and recommendations for the integration of energy harvesting, electrification, and 5G communication. Given the emergence of autonomous, connected, and electrified technologies, I-ACT will serve a critical role for the state of Illinois in developing, testing, and validating mobility technologies, along with establishing an integrated infrastructure that will safely and reliably serve all users. A summary of recommendations related to the design features of I-ACT is presented for energy harvesting, electrification, and 5G communication network. Moreover, a business plan was developed. All findings and recommendations were provided to AECOM, as part of the I-ACT’s conceptualization phase.

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Carpenter, Marie, i William Lazonick. The Pursuit of Shareholder Value: Cisco’s Transformation from Innovation to Financialization. Institute for New Economic Thinking Working Paper Series, luty 2023. http://dx.doi.org/10.36687/inetwp202.

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Once the global leader in telecommunication systems and the Internet, over the past two decades the United States has fallen behind global competitors, and in particular China, in mobile communication infrastructure—specifically 5G and Internet of Things (IoT). This national failure, with the socioeconomic and geopolitical tensions that it creates, is not due to a lack of US government investment in the knowledge required for the mobility revolution. Nor is it because of a dearth of domestic demand for the equipment, devices, and applications that can make use of this infrastructure. Rather, the problem is the dereliction of key US-based business corporations to take the lead in making the investments in organizational learning required to generate cutting edge communication-infrastructure products. No company in the United States exemplifies this deficiency more than Cisco Systems, the business corporation founded in Silicon Valley in 1984 that had explosive growth in the 1990s to become the foremost global enterprise-networking equipment producer in the Internet revolution. This paper provides in-depth analysis of Cisco’s organizational failure, attributing it ultimately to the company’s turn from innovation in the last decades of 20th century to financialization in the early decades of the 21st century. Since 2001, Cisco’s top management has chosen to allocate corporate cash to open-market share repurchases— aka stock buybacks—for the purpose of giving manipulative boosts to the company stock price rather than make the investments in organizational learning required to become a world leader in communication-infrastructure equipment for the era of 5G and IoT. From October 2001 through October 2022, Cisco spent $152.3 billion—95 percent of its net income over the period—on stock buybacks for the purpose of propping up its stock price. These funds wasted in pursuit of “maximizing shareholder value” were on top of the $55.5 billion that Cisco paid out to shareholders in dividends, representing an additional 35 percent of net income. In this paper, we trace how Cisco grew from a Silicon Valley startup in 1984 to become, through its innovative products, the world leader in enterprise-networking equipment over the next decade and a half. As the company entered the 21st century, building on its dominance of enterprise-networking, Cisco was positioned to upgrade its technological capabilities to become a major infrastructureequipment vendor to service providers. We analyze how and why, when the Internet boom turned to bust in 2001, the organizational structure that enabled Cisco to dominate enterprise networking posed constraints related to manufacturing and marketing on the company’s growth in the more sophisticated infrastructure-equipment segment. We then document how from 2002 Cisco turned from innovation to financialization, as it used its ample profits to do stock buybacks to prop up its stock price. Finally, we ponder the larger policy implications of Cisco’s turn from innovation to financialization for the competitive position of the US information-and-communication technology (ICT) industry in the global economy.

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