Gotowe bibliografie tematyczne / LTE Radio Access

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Gotowa bibliografia na temat „LTE Radio Access”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "LTE Radio Access"

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Bogineni, Kalyani, Reiner Ludwig, Preben Mogensen, Vish Nandlall, Vojislav Vucetic, Byung K. Yi i Zoran Zvonar. "LTE part II: Radio access [Guest Editorial]". IEEE Communications Magazine 47, nr 4 (kwiecień 2009): 40–42. http://dx.doi.org/10.1109/mcom.2009.4907405.

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Dehghani, Mohammad, Kamran Arshad i Richard MacKenzie. "LTE-Advanced Radio Access Enhancements: A Survey". Wireless Personal Communications 80, nr 3 (6.09.2014): 891–921. http://dx.doi.org/10.1007/s11277-014-2062-y.

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Kim, Juyeop, Sang Won Choi, Won-Yong Shin, Yong-Soo Song i Yong-Kyu Kim. "Group communication over LTE: a radio access perspective". IEEE Communications Magazine 54, nr 4 (kwiecień 2016): 16–23. http://dx.doi.org/10.1109/mcom.2016.7452261.

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Pepadu, Jurnal, i Muhamad Shodikin. "ANALISIS PERANCANGAN LTE HOME PADA JARINGAN 4G LTE BERBASIS OPEN RADIO ACCESS NETWORK". Jurnal Pepadu 2, nr 4 (29.10.2021): 408–20. http://dx.doi.org/10.29303/pepadu.v2i4.2255.

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Penelitian tentang LTE berlanjut hingga teknologi generasi kelima secara resmi ditetapkan oleh badan standar. Ketersediaan jaringan transmisi berbasis serat optik mendorong riset untuk mengoptimalkan kecepatan akses pelanggan rumahan sehingga PT Telkomsel meluncurkan layanan LTE Home berbasis modem CPE untuk menghadirkan komunikasi LTE. Dasar dari teknologi LTE Home adalah penguat sinyal menggunakan modem CPE di rumah pelanggan. Mudah diimplementasikan tetapi memiliki kelemahan yaitu tidak memancarkan sinyalnya sendiri dan membebani pemancar sumber LTE. Penelitian ini mengusulkan teknologi LTE Home berbasis Open Radio Access Network (ORAN) sebagai solusi, dengan memasang pemancar LTE Home di rumah pelanggan dan terkoneksi langsung ke jaringan inti melalui transmisi pita lebar milik sendiri / sewa. Penelitian ini penting dilakukan karena dapat menyelesaikan masalah konektivitas tidak langsung dengan sistem jaringan inti yang terjadi pada LTE Home berbasis modem CPE dan juga membuka peluang penerapan teknologi seperti IoT untuk rumah pintar dan gedung pintar. Metode penelitian ini menganalisis desain LTE Home berbasis ORAN, model pengukuran Key Performance Indicator (KPI) dan integrasinya ke dalam operator seluler. Batasan penelitian adalah eksplorasi teknologi LTE berbasis ORAN yang disimulasikan secara virtual terintegrasi dengan komponen Open Source. Luaran penelitian ini mendeskripsikan desain LTE Home berbasis ORAN, mendeskripsikan hardware dan software berbasis Open Source yang digunakan, menjelaskan desain dan simulasi teknik LTE Home berbasis ORAN, menjelaskan bahwa ORAN merupakan teknologi berbasis Open Source yang murah namun layak.
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Tsolkas, Dimitris, Nikos Passas i Lazaros Merakos. "Device discovery in LTE networks: A radio access perspective". Computer Networks 106 (wrzesień 2016): 245–59. http://dx.doi.org/10.1016/j.comnet.2016.07.001.

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Tata, Chafika, i Michel Kadoch. "Efficient Priority Access to the Shared Commercial Radio with Offloading for Public Safety in LTE Heterogeneous Networks". Journal of Computer Networks and Communications 2014 (2014): 1–15. http://dx.doi.org/10.1155/2014/597425.

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This paper presents the algorithm Courteous Priority Access to the shared commercial radio with offloading (CPAwO), for public safety network (PSN) over LTE heterogeneous networks (HetNets). We propose a solution for prioritization of PSN users with access to the commercial radio network resources. Our model offers additional radio resources to the PSN. Furthermore, it ensures a certain priority for commercial users by assigning quantities of additional radio resources through the courteous scheme. This allows delaying preemption and blocking bearers when the radio resources are limited. The other part of CPAwO model is to apply the principle of offloading in order to reduce the impact of the macrocell congestion. This technique is to switch the new bearers arriving at the LTE macrocells to small cells, in order to decrease the number of the blocked and interrupted bearers in the network. The results of the simulation showed that the allocation of radio resources via the courteous mechanism with offloading of new bearers to small cells reduces the rate of blocking bearers and delays the preemption of active bearers present in the LTE HetNets. It also reduces the cost of the end-to-end communications, thanks to the reallocation of free frequencies.
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McKeever, Padraic, Abhinav Sadu, Shubham Rohilla, Zain Mehdi i Antonello Monti. "Ensuring Uninterrupted MTC Service Availability during Emergencies Using LTE/5G Public Mobile Land Networks". Telecom 1, nr 3 (10.10.2020): 181–95. http://dx.doi.org/10.3390/telecom1030013.

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During emergencies LTE/5G-based public mobile land networks (PLMNs) restrict network access by normal users, which means a lack of service reliability which limits application of LTE/5G for machine-type communication (MTC) in critical applications, such as power systems This paper shows how existing LTE/5G features can be used to differentiate MTC of devices in a microgrid from other MTC or human-to-human (H2H) communication and ensure that these microgrid devices have service during emergencies, which enables use of LTE/5G communication to co-ordinate the use of distributed energy resources (DER) in microgrids, so that they can autarkically perform blackout recovery of an islanded microgrid. It is shown that this method allows the blackout recovery 100 times faster than with a conventional black start. The microgrid blackout recovery is demonstrated using the LTE/5G PLMN Access Barring feature. The disadvantage of using PLMN-based Access Barring is the need to define two separate PLMNs in one radio cell, which is an inefficient use of radio spectrum. However, this can be avoided by using the Extended Access Class Barring (EAB) override or application-specific congestion control (ACDC) features of the CAT-M1 low-power wide-area MTC technology, which are included in LTE and 5G standards.
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DAHLMAN, Erik, Ylva JADING, Stefan PARKVALL i Hideshi MURAI. "3G Radio Access Evolution — HSPA and LTE for Mobile Broadband —". IEICE Transactions on Communications E92-B, nr 5 (2009): 1432–40. http://dx.doi.org/10.1587/transcom.e92.b.1432.

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TANNO, Motohiro, Yoshihisa KISHIYAMA, Hidekazu TAOKA, Nobuhiko MIKI, Kenichi HIGUCHI i Mamoru SAWAHASHI. "Layered OFDMA and Its Radio Access Techniques for LTE-Advanced". IEICE Transactions on Communications E92-B, nr 5 (2009): 1743–50. http://dx.doi.org/10.1587/transcom.e92.b.1743.

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Roy, Arghyadip, Prasanna Chaporkar i Abhay Karandikar. "Optimal Radio Access Technology Selection Algorithm for LTE-WiFi Network". IEEE Transactions on Vehicular Technology 67, nr 7 (lipiec 2018): 6446–60. http://dx.doi.org/10.1109/tvt.2018.2805190.

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Rozprawy doktorskie na temat "LTE Radio Access"

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Al-Dulaimi, Anwer. "Cognitive radio systems in LTE networks". Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/11544.

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The most important fact in the mobile industry at the moment is that demand for wireless services will continue to expand in the coming years. Therefore, it is vital to find more spectrums through cognitive radios for the growing numbers of services and users. However, the spectrum reallocations, enhanced receivers, shared use, or secondary markets-will not likely, by themselves or in combination, meet the real exponential increases in demand for wireless resources. Network operators will also need to re-examine network architecture, and consider integrating the fibre and wireless networks to address this issue. This thesis involves driving fibre deeper into cognitive networks, deploying microcells connected through fibre infrastructure to the backbone LTE networks, and developing the algorithms for diverting calls between the wireless and fibre systems, introducing new coexistence models, and mobility management. This research addresses the network deployment scenarios to a microcell-aided cognitive network, specifically slicing the spectrum spatially and providing reliable coverage at either tier. The goal of this research is to propose new method of decentralized-to-distributed management techniques that overcomes the spectrum unavailability barrier overhead in ongoing and future deployments of multi-tiered cognitive network architectures. Such adjustments will propose new opportunities in cognitive radio-to-fibre systematic investment strategies. Specific contributions include: 1) Identifying the radio access technologies and radio over fibre solution for cognitive network infrastructure to increase the uplink capacity analysis in two-tier networks. 2) Coexistence of macro and microcells are studied to propose a roadmap for optimising the deployment of cognitive microcells inside LTE macrocells in the case of considering radio over fibre access systems. 3) New method for roaming mobiles moving between microcells and macrocell coverage areas is proposed for managing spectrum handover, operator database, authentication and accounting by introducing the channel assigning agent entity. The ultimate goal is to reduce unnecessary channel adaptations.
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Tirouvengadam, Balaaji. "Enhancement of LTE Radio Access Protocols for Efficient Video Streaming". Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23260.

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A drastic increase in traffic of mobile broadband is seen in the past few years, which is further accelerated by the increase in usage of smart phones and its applications. The availability of good smart phones and better data connectivity are encouraging mobile users to use video services. This huge increase in usage will pose a lot of challenges to the wireless networks. The wireless network has to become content aware in order to offer enhanced quality of video service through efficient utilization of the wireless spectrum. This thesis focuses on improving the Quality of Experience (QoE) for video transmission over Long Term Evolution (LTE) networks by imparting the content awareness to the system and providing unequal error protection for critical video packets. Two different schemes for the improvement of video quality delivery over LTE networks are presented in this thesis. Using content awareness, the retransmission count of Hybrid Automatic Repeat reQuest (HARQ) are changed dynamically such that the most important video frame gets more number of retransmission attempts, which increases its success for delivery in-turn increasing the received video quality. Since Radio Link Control (RLC) is the link layer for radio interface, the second approach focuses on optimizing this layer for efficient video transmission. As part of this scheme, a new operation mode called Hybrid Mode (HM) for RLC is defined. This mode performs retransmission only for the critical video frames, leaving other frames to unacknowledged transmission. The simulation results of both proposed schemes provide significant improvement in achieving good video quality without affecting the system performance.
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Comşa, Ioan-Sorin. "Sustainable scheduling policies for radio access networks based on LTE technology". Thesis, University of Bedfordshire, 2014. http://hdl.handle.net/10547/584068.

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In the LTE access networks, the Radio Resource Management (RRM) is one of the most important modules which is responsible for handling the overall management of radio resources. The packet scheduler is a particular sub-module which assigns the existing radio resources to each user in order to deliver the requested services in the most efficient manner. Data packets are scheduled dynamically at every Transmission Time Interval (TTI), a time window used to take the user’s requests and to respond them accordingly. The scheduling procedure is conducted by using scheduling rules which select different users to be scheduled at each TTI based on some priority metrics. Various scheduling rules exist and they behave differently by balancing the scheduler performance in the direction imposed by one of the following objectives: increasing the system throughput, maintaining the user fairness, respecting the Guaranteed Bit Rate (GBR), Head of Line (HoL) packet delay, packet loss rate and queue stability requirements. Most of the static scheduling rules follow the sequential multi-objective optimization in the sense that when the first targeted objective is satisfied, then other objectives can be prioritized. When the targeted scheduling objective(s) can be satisfied at each TTI, the LTE scheduler is considered to be optimal or feasible. So, the scheduling performance depends on the exploited rule being focused on particular objectives. This study aims to increase the percentage of feasible TTIs for a given downlink transmission by applying a mixture of scheduling rules instead of using one discipline adopted across the entire scheduling session. Two types of optimization problems are proposed in this sense: Dynamic Scheduling Rule based Sequential Multi-Objective Optimization (DSR-SMOO) when the applied scheduling rules address the same objective and Dynamic Scheduling Rule based Concurrent Multi-Objective Optimization (DSR-CMOO) if the pool of rules addresses different scheduling objectives. The best way of solving such complex optimization problems is to adapt and to refine scheduling policies which are able to call different rules at each TTI based on the best matching scheduler conditions (states). The idea is to develop a set of non-linear functions which maps the scheduler state at each TTI in optimal distribution probabilities of selecting the best scheduling rule. Due to the multi-dimensional and continuous characteristics of the scheduler state space, the scheduling functions should be approximated. Moreover, the function approximations are learned through the interaction with the RRM environment. The Reinforcement Learning (RL) algorithms are used in this sense in order to evaluate and to refine the scheduling policies for the considered DSR-SMOO/CMOO optimization problems. The neural networks are used to train the non-linear mapping functions based on the interaction among the intelligent controller, the LTE packet scheduler and the RRM environment. In order to enhance the convergence in the feasible state and to reduce the scheduler state space dimension, meta-heuristic approaches are used for the channel statement aggregation. Simulation results show that the proposed aggregation scheme is able to outperform other heuristic methods. When the aggregation scheme of the channel statements is exploited, the proposed DSR-SMOO/CMOO problems focusing on different objectives which are solved by using various RL approaches are able to: increase the mean percentage of feasible TTIs, minimize the number of TTIs when the RL approaches punish the actions taken TTI-by-TTI, and minimize the variation of the performance indicators when different simulations are launched in parallel. This way, the obtained scheduling policies being focused on the multi-objective criteria are sustainable. Keywords: LTE, packet scheduling, scheduling rules, multi-objective optimization, reinforcement learning, channel, aggregation, scheduling policies, sustainable.
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Song, Qipeng. "Radio access mechanisms for massive machine communication in long-range wireless networks". Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0047/document.

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En tant qu'étape importante vers une société intelligente, hormis la communication d'humain à humain (H2H), les réseaux sans fil de l'avenir devraient prendre en charge la communication machine-à-machine (également connue sous le nom de MTC). Ce dernier est un nouveau paradigme de communication dans lequel les terminaux peuvent parler les uns avec les autres sans ou avec peu d'intervention humaine. Avec la prolifération rapide des applications M2M, un grand nombre de terminaux seront déployés dans de nombreux types d'applications telles que le comptage intelligent, l'automatisation de l'industrie, la télésanté, etc.Cependant, les réseaux sans fil actuels ne sont toujours pas prêts pour écouler correctement le trafic des MTC. La raison en est double. Tout d'abord, l'évolution du réseau sans fil vise à augmenter le débit et à réduire le délai. Deuxièmement, les caractéristiques spéciales des MTC, telles qu'un nombre très élevé de terminaux déployés, une petite charge utile mais une transmission fréquente, un emplacement souvent d'installation défavorable, etc., font que les exigences de H2H ne sont pas partagés par la plupart des cas d'utilisation M2M.À partir de l'état de l'art, nous distinguons deux orientations de recherche possibles pour gérer efficacement le trafic M2M: Low Power Wide Area Network (LPWAN) et adaptation des réseaux cellulaires existants. Pour les deux pistes, les mécanismes d'accès radio, utilisés dans le réseau d'accès radio (RAN) sont d'une importance vitale pour assurer le succès de MTC. De ce point de vue, le mécanisme d'accès radio est le principal objectif de nos études. Dans cette thèse, nous présentons les contributions couvrant les aspects susmentionnés.Les contributions de cette thèse sont résumées dans les points suivants:Nous faisons état de l'art sur les études liées à l'efficacité énergétique des MTC de la littérature. La contribution principale de cette enquête est de passer en revue, classifier les travaux de recherche existants dans différentes catégories, et de comparer les avantages et les inconvénients entre les catégories. Nous parlons également des progrès de l'approche basée sur les LPWAN.Nous étudions l'impact de la diversité du niveau de puissance d'émission et du contrôle de puissance imparfait sur les systèmes LPWAN en slotted-ALOHA. Quelques directives de conception perspicaces sont obtenues en manipulant le modèle analytique établi.Nous étudions les performances du système LPWAN avec la diversité de la réception macro. En utilisant la géométrie stochastique, nous établissons des formules simples de forme fermée pour le taux de perte de paquets et le débit spatial. Ces formules sont très utiles pour analyser les réseaux LPWAN (en particulier dans les zones urbaines) et pour quantifier le gain de capacité du système. En rassemblant plusieurs résultats disponibles sur l'analyse de l'ALOHA pure, nous obtenons finalement un cadre de synthèse pour étudier le RAN de LPWAN.En termes d'adaptations au RAN des réseaux LTE, nous analysons d'abord le mécanisme d'accès aléatoire conventionnel dans LTE et identifions les inefficacités existantes. Nous proposons ensuite un service d'interrogation multipériodique pour les cas d'utilisation M2M périodiques. Le service proposé est comparé au mécanisme d'accès aléatoire conventionnel en LTE dans un modèle fluide. Les résultats numériques montrent que le service proposé réduit considérablement la consommation des ressources système telles que l'identificateur temporaire de réseau radio (RNTI), le bloc de ressources (RB) et a une efficacité énergétique supérieure en raison de l'évitement de la procédure d'accès aléatoire et des messages de signalisation associés
As a key step toward a smart society, apart from the Human-to-Human (H2H) communication, the future wireless networks, are expected to accommodate Machine-to-Machine Communication (also known as Machine Type Communication (MTC)). The latter is a new communication paradigm in which the devices can talk with each other without or with little human intervention. With the rapid proliferation of M2M applications, a huge number of devices will be deployed in many types of use cases such as smart metering, industry automation, e-health, etc. However, the current wireless networks are still not ready to hold traffic from MTC. The reason is twofold. First, the evolution of the wireless network seeks for higher throughput and lower latency. Second, the special features that MTC exhibits, such as huge number of deployed devices, small payload but frequent transmission, adverse installation location, etc., lead to that the requirements by H2H are no longer required by most of M2M use cases.From the state-of-the-art work, we find that two possible research orientations to efficiently handle M2M traffic: Low Power Wide Area Network (LPWAN) and adaption of the existing cellular networks. For both of them, the radio access mechanisms, used in Radio Access Network (RAN), is vitally important to make MTC a promising technology. From this view, radio access mechanism is the main focus of our studies. In this thesis, we present the contributions covering the aforementioned aspects: performance evaluation of ALOHA-based LPWAN networks, and a polling service that is an extension to RAN of LTE networks for periodic M2M traffic.The contributions of this thesis are summarized on the following axis: We make a survey about the energy efficiency related studies in the literatures. The main contribution in this survey is to review, classify the existing research works into different categories, and compare the pros and cons between categories. We also review the advances of the LPWAN related study. We study the impact of transmit power level diversity and imperfect power control to the slotted ALOHA based LPWAN systems. Some insightful design guidelines are obtained by manipulating the established analytical model. We study the performance of LPWAN system with macro reception diversity. By stochastic geometry, we get simple closed-form formulas for the packet loss rate and spatial throughput, which were unknown before. These formulas are very useful to analyze LPWAN networks (especially in urban areas) and to quantify the system capacity gain. By gathering several available results about the analysis of non slotted ALOHA, we finally get a synthesis framework to study the RAN of LPWAN. In terms of adaptations to RAN of LTE networks, we first analyze the conventional random access mechanism in LTE and identify the existing inefficiencies. We then propose a multiple period polling service for periodic M2M use cases. The proposed service is compared with conventional random access mechanism in LTE in a fluid model. The numerical results show that the proposed service dramatically reduces the consumption of system resources such as Radio Network Temporary Identifier (RNTI), Resource Block (RB) and has a higher energy efficiency due to the avoidance of random access procedure and related signaling messages
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Lyazidi, Mohammed Yazid. "Dynamic resource allocation and network optimization in the Cloud Radio Access Network". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066549/document.

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Le Cloud Radio Access Network (C-RAN) est une future direction dans les réseaux de communications sans fils pour déployer des systèmes cellulaires 4G et renforcer la migration des opérateurs vers la nouvelle génération 5G. En comparaison avec l'architecture traditionnelle des stations de base distribuées, l'architecture C-RAN apporte un lot d'avantages à l'opérateur: meilleure utilisation des ressources radio, flexibilité du réseau, minimisation de la puissance consommée et amenuisement des coûts de déploiement. Dans cette thèse, nous adressons le problème d'allocation dynamique des ressources et minimisation de la puissance des communications à liaison descendante dans le C-RAN. Notre recherche vise à allouer les ressources radio à des flux dynamiques d'utilisateurs, tout en trouvant les meilleures combinaisons entre points d'accès et unités de calculs, pour satisfaire la demande de trafic. Il s'agit en outre, d'un problème d'optimisation non linéaire et NP-difficile, comprenant plusieurs contraintes relatives aux demandes de ressources des utilisateurs, gestion d'interférences, capacités fixes des unités de calcul dans le Cloud et des liaisons de transport ainsi que la limitation de la puissance transmise maximale. Afin de surmonter la complexité inhérente à cette problématique du C-RAN, nous présentons différentes approches pour l'allocation dynamique des ressources en trois principales contributions. Les résultats de nos simulations prouvent l'efficacité de nos méthodes, comparé à celles existantes dans la littérature, en termes de taux de débit de satisfaction, nombre d'antennes actives, puissance consommée dans le Cloud, résilience et coût opérationnel du C-RAN
Cloud Radio Access Network (C-RAN) is a future direction in wireless communications for deploying cellular radio access subsystems in current 4G and next-generation 5G networks. In the C-RAN architecture, BaseBand Units (BBUs) are located in a pool of virtual base stations, which are connected via a high-bandwidth low latency fronthaul network to Radio Remote Heads (RRHs). In comparison to standalone clusters of distributed radio base stations, C-RAN architecture provides significant benefits in terms of centralized resource pooling, network flexibility and cost savings. In this thesis, we address the problem of dynamic resource allocation and power minimization in downlink communications for C-RAN. Our research aims to allocate baseband resources to dynamic flows of mobile users, while properly assigning RRHs to BBUs to accommodate the traffic and network demands. This is a non-linear NP-hard optimization problem, which encompasses many constraints such as mobile users' resources demands, interference management, BBU pool and fronthaul links capacities, as well as maximum transmission power limitation. To overcome the high complexity involved in this problem, we present several approaches for resource allocation strategies and tackle this issue in three stages. Obtained results prove the efficiency of our proposed strategies in terms of throughput satisfaction rate, number of active RRHs, BBU pool processing power, resiliency, and operational budget cost
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Videv, Stefan. "Techniques for green radio cellular communications". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7988.

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This thesis proposes four novel techniques to solve the problem of growing energy consumption requirements in cellular communication networks. The first and second part of this work propose a novel energy efficient scheduling mechanism and two new bandwidth management techniques, while the third part provides an algorithm to actively manage the power state of base stations (BSs) so that energy consumption is minimized throughout the day while users suffer a minimal loss in achieved data rate performance within the system. The proposed energy efficient score based scheduler (EESBS) is based on the already existing principle of score based resource allocation. Resource blocks (RBs) are given scores based on their energy efficiency for every user and then their allocation is decided based on a comparison between the scores of the different users on each RB. Two additional techniques are introduced that allow the scheduler to manage the user’s bandwidth footprint or in other words the number of RBs allocated. The first one, bandwidth expansion mode (BEM), allows users to expand their bandwidth footprint while retaining their overall transmission data rate. This allows the system to save energy due to the fact that data rate scales linearly with bandwidth and only logarithmically with transmission power. The second technique, time compression mode (TCoM), is targeted at users whose energy consumption is dominated by signalling overhead transmissions. If the assumption is made that the overhead is proportional to the number of RBs allocated, then users who find themselves having low data rate demands can release some of their allocated RBs by using a higher order modulation on the remaining ones and thus reduce their overall energy expenditure. Moreover, a system that combines all of the aforementioned scheduling techniques is also discussed. Both theoretical and simulation results on the performance of the described systems are provided. The energy efficient hardware state control (EESC) algorithm works by first collecting statistical information about the loading of each BS during the day that is due to the particular mobility patterns of users. It then uses that information to allow the BSs to turn off for parts of the day when the expected load is low and they can offload their current users to nearby cell sites. Simplified theoretical, along with complete system computer simulation, results are included. All the algorithms presented are very straightforward to implement and are not computationally intensive. They provide significant energy consumption reductions at none to minimal cost in terms of experienced user data rate.
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Zhu, Changwen. "Nonlinear Analysis and Digital Pre-Distortion of the SC-FDMA Signals in LTE Uplink System". PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2105.

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Single-carrier frequency division multiple access (SC-FDMA) has become a popular alternative to orthogonal frequency division multiple access (OFDM) in multi-user communication on LTE uplink systems. This is primarily due to the low peak-to-average power ratio (PAPR) of SC-FDMA compared to that of OFDM. Long-term evolution (LTE) uses SC-FDMA on the uplink to exploit this PAPR advantage to reduce transmit power amplifier (PA) back-off in mobile user terminals. However, the latest generation of communication systems requires high power efficiency and a large quantity of capacity in transmitting mobile data, bringing out some other critical problems: 1) the nonlinearity of Radio Frequency (RF) power amplifiers inevitably affects the power efficiency. Working beyond the saturation point is the main reason for power amplifiers having nonlinear properties; 2) In order to obtain adequate capacity, wide bandwidth is applied to the latest communication systems. Since in previous systems the pre-distorter would focus on memory-less distortion with relatively narrow bandwidth, this change makes memory distortion become a serious issue, degrading the transmission quality in the wireless communication systems. The intent of this thesis is to present nonlinear analysis of the SC-FDMA Spectrum with the RF power amplifier. Relevant mathematical models were considered and applied to the RF power amplifier in terms of intermodulation products and the third-order intercept point. The equivalent mathematical model is applied for the first time to SC-FDMA signals and with the previous formulation of the PA model, the derivation of the expressions for spectrum regrowth of amplified SC-FDMA signals was first established and finally simulated with Matlab software. The digital pre-distortion (DPD) technology was also applied to SC-FDMA signals for the first time in this thesis. An inverse intermodulation and Autoregressive Moving-Average (IM-ARMA) model was introduced to linearize the PA distortion with memory in the LTE uplink system. The DPD was finally implemented by Matlab R2010b. Conclusions are drawn that amplified power emission levels can be expressed by the form of third-order intercept point (IP_3). The expressions for spectrum regrowth of amplified SC-FDMA signals have been verified for the first time with the comparison of simulation, measurement and calculation results. The effects of third order intermodulation have a greater impact than higher order components with respect to out-of-band emission power levels. Furthermore, the DPD algorithm reduced the spectrum regrowth of SC-FDMA signals by 12 dB. The proposed pre-distorter can effectively solve the distortion problem caused by the memory effect in RF power amplifier.
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Fu, Zhu. "Digital Pre-distortion for Interference Reduction in Dynamic Spectrum Access Networks". Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-dissertations/152.

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Given the ever increasing reliance of today’s society on ubiquitous wireless access, the paradigm of dynamic spectrum access (DSA) as been proposed and implemented for utilizing the limited wireless spectrum more efficiently. Orthogonal frequency division multiplexing (OFDM) is growing in popularity for adoption into wireless services employing DSA frame- work, due to its high bandwidth efficiency and resiliency to multipath fading. While these advantages have been proven for many wireless applications, including LTE-Advanced and numerous IEEE wireless standards, one potential drawback of OFDM or its non-contiguous variant, NC-OFDM, is that it exhibits high peak-to-average power ratios (PAPR), which can induce in-band and out-of-band (OOB) distortions when the peaks of the waveform enter the compression region of the transmitter power amplifier (PA). Such OOB emissions can interfere with existing neighboring transmissions, and thereby severely deteriorate the reliability of the DSA network. A performance-enhancing digital pre-distortion (DPD) technique compensating for PA and in-phase/quadrature (I/Q) modulator distortions is proposed in this dissertation. Al- though substantial research efforts into designing DPD schemes have already been presented in the open literature, there still exists numerous opportunities to further improve upon the performance of OOB suppression for NC-OFDM transmission in the presence of RF front-end impairments. A set of orthogonal polynomial basis functions is proposed in this dissertation together with a simplified joint DPD structure. A performance analysis is presented to show that the OOB emissions is reduced to approximately 50 dBc with proposed algorithms employed during NC-OFDM transmission. Furthermore, a novel and intuitive DPD solution that can minimize the power regrowth at any pre-specified frequency in the spurious domain is proposed in this dissertation. Conventional DPD methods have been proven to be able to effectively reduce the OOB emissions that fall on top of adjacent channels. However more spectral emissions in more distant frequency ranges are generated by employing such DPD solutions, which are potentially in violation of the spurious emission limit. At the same time, the emissions in adjacent channel must be kept under the OOB limit. To the best of the author’s knowledge, there has not been extensive research conducted on this topic. Mathematical derivation procedures of the proposed algorithm are provided for both memoryless nonlinear model and memory-based nonlinear model. Simulation results show that the proposed method is able to provide a good balance of OOB emissions and emissions in the far out spurious domain, by reducing the spurious emissions by 4-5 dB while maintaining the adjacent channel leakage ratio (ACLR) improvement by at least 10 dB, comparing to the PA output spectrum without any DPD.
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Ghariani, Takoua. "Conservation de l'énergie sur des environnements de réseaux d'accès radio hétérogènes : vers des réseaux auto-organisants et verts". Thesis, Evry, Institut national des télécommunications, 2014. http://www.theses.fr/2014TELE0023/document.

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La préservation de l’environnement et des ressources naturelles pour les prochaines générations est aujourd’hui considérée comme un des axes les plus prioritaires dans presque tous les secteurs économiques. Le secteur des Technologies de l’Information et de la Communication est loin d’être épargné de cette tendance écologique. Nous considérons dans cette thèse la problématique de la conservation d’énergie dans le contexte technologique actuel caractérisé par: • La coexistence d’une multitude de technologies d’accès sans fil offrant un environnement riche et dynamique • Des terminaux mobiles multimodaux • Limitations persistantes des sources d’énergie sur les terminaux mobiles. Dans ce contexte très riche, les possibilités offertes aux usagers sont à double tranchant. D’un côté, elles peuvent très bien améliorer la QoS en offrant toujours la meilleure connectivité en fonction du contexte de l’utilisateur. D’un autre côté, et sans une bonne optimisation de la consommation d’énergie sur le terminal, la disponibilité de celui-ci peut vite diminuer et donc faire baisser la QoE à cause de l’énergie nécessaire pour gérer plusieurs interfaces radio en parallèle. Nous considérons essentiellement les liens entre les stations de base (ou les point d’accès) et les terminaux mobiles. Notre objectif étant d’analyser la consommation d’énergie sur ces liens pour ensuite proposer des contributions permettant de mieux la maitriser. Nous focalisons essentiellement sur l’exploitation des multiples interfaces et du multi-flux pour étudier, analyser et proposer des solutions dynamiques et adaptatives d’ordonnancement, de sélection et de gestion d’interfaces minimisant la consommation d’énergie
Since the last decades, environmental issues are becoming among the major concerns for most human activities, including the Information and Communication Technologies sector. This will surely influence upcoming networking technologies, architectures and usage practices. New approaches and methodologies are required in order to evaluate and to reduce the Carbon Footprint toward what is commonly denoted as Green Networks. Within the ICT sector, the main efforts are related to energy saving techniques. These efforts started in early stages within wireless technologies, mainly because of energy limitations on mobile devices such as mobile phones and wireless sensors. Additionally, because of health considerations, standardization bodies and government had set stringent policies and limits on electromagnetic radiation levels that can be emitted by radio stations. For these reasons, many academic and industrial research and development activities had led to a number of relatively energy efficient solutions. In this thesis, we consider energy efficiency in the context of Heterogeneous Wireless Access Networks. These are composed of multi-standards wireless network solutions, with non uniform topologies and cell sizes and Multi-Modal mobile terminals able to manage simultaneously different connections. The main contributions of our studies include the proposal of new optimization solutions regarding user association and scheduling techniques at both flow and packet levels for multi-homed mobile terminals. An overall context-based solution is also proposed in order to provide end-to-end energy efficient networking solutions
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Zhong, Zhenzhe. "Cross-layer congestion control and quality of services in mobile networks". Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAT022.

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Le réseau mobile est un réseau hybride avec une partie d’accès radio et le réseau central de liaison fixe. Les algorithmes de contrôle de congestion (CCA) conçus pour un type de système spécifique peuvent ne pas fonctionner aussi bien dans l’autre type de réseau, en particulier le réseau avec un dispositif de fonctionnalité hybride comme le réseau de périphérie mobile. Généralement, le goulot d’étranglement dans un réseau mobile est la partie accès radio. Cependant, ce n’est pas toujours le cas puisque plusieurs stations de base radio ou passerelle de réseau de livraison de paquets peuvent partager le même goulot d’étranglement dans le backhaul de livraison de paquets. Dans cette thèse, nous partons d’une méthode cross-layer et abordons le problème avec une solution omniprésente. Le premier algorithme que nous avons analysé est appelé CQIC, qui implique la couche PHY de l’UE dans la conception du contrôle de la congestion. Une amélioration du scénario 3G CQIC au scénario LTE est proposée sous le nom de DCIC. Cet algorithme utilise l’indicateur de commande de liaison descendante (DCI) au lieu de l’indicateur de qualité de canal (CQI) pour économiser la puissance de calcul sur l’UE et prendre en compte le résultat de la planification d’eNB. En outre, nous avons évalué l’algorithme BBR actuel, qui se concentre sur le réseau du centre de données, dans le scénario mobile. La plupart des CCA conventionnels ne prennent pas en compte la dégradation du BW de liaison montante et les autres caractéristiques du système cellulaire dans sa méthode d’estimation de la largeur de bande. Sur la base de cet examen, nous avons proposé les cinq objectifs de compromis pour guider la conception de l’ACC dans un type de réseau hybride mobile: utilisation de la bande passante, délai (où la perte est l’expression extrême du retard), équité, simplicité et généricité. Sur la base des compromis et des objectifs, nous avons proposé le CDBE, une estimation de la bande passante pilotée par le client TCP (CDBE) et une boucle de rétroaction de rapport. La méthode d’estimation BW côté client ne prend que peu de capacité de calcul dans la deuxième version, par rapport à la première version ou CQIC et DCIC. Coopérer avec la transition d’état côté serveur améliorée CDBE peut atteindre une part équitable de BW dans le réseau central `a paquets fixes ou le réseau mobile avec un coût de RTT inférieur à celui des CCA conventionnels. Aucune unité / application de boîtier de médiation ou de périphérie n’est requise dans l’architecture CDBE
The mobile network is a hybrid network with Radio Access part and the fixed backhaul core network. The congestion control algorithms(CCA) designed for a specific type of system may not work as well in the other kind of network, especially the network with hybrid feature device like the mobile edge network. Generally, the bottleneck in a mobile network is the Radio access part. However, this is not always the case since multiple radio base stations or packet delivery network gateway can be sharing the same bottleneck in the packet delivery backhaul. In this thesis, we start from a cross-layer method and address the issue with a ubiquitous solution. The first algorithm we analysed is called CQIC, which get the PHY layer of UE involved in the congestion control design. An improvement from 3G CQIC to LTE scenario is proposed named DCIC. This algorithm uses the Downlink Control Indicator(DCI) instead of Channel Quality Indicator(CQI) to save the computation power on UE and take the scheduling result of eNB into consideration. Further, we evaluated current BBR algorithm, which focuses on the data centre network, in the mobile scenario. Most conventional CCA does not take the uplink BW degradation and other features in the cellular system into consideration in its bandwidth estimation method. Based on the review, we proposed the five tradeoff objectives to guide the CCA design in a mobile hybrid type of network: Bandwidth Utilisation, Delay (where loss is the extreme expression of delay), Fairness, Simplicity and Genericity. Based on the tradeoffs and goals, we proposed CDBE, a TCP clientside driven bandwidth estimation(CDBE) and report feedback loop. The client-side BW estimation method takes only little computation capability in the second version, compared to its first version and the DCIC. Cooperate with the enhanced server-side state transition CDBE can achieve a fair share of BW in both fixed packet core network or mobile network with a lower cost of RTT compared to conventional CCAs. No extra middlebox or edge computing unit/applications is required in CDBE architecture
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Książki na temat "LTE Radio Access"

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1970-, Holma Harri, i Toskala Antti, red. LTE for UMTS-OFDMA and SC-FDMA based radio access. Chichester, West Sussex, U.K: Wiley, 2009.

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Toskala, Antti, i Harri Holma. Lte for Umts - Ofdma and SC-Fdma Based Radio Access. Wiley & Sons, Incorporated, John, 2009.

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Toskala, Antti, i Harri Holma. LTE for UMTS: OFDMA and SC-FDMA Based Radio Access. Wiley & Sons, Incorporated, John, 2009.

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Toskala, Antti, i Harri Holma. LTE for UMTS - OFDMA and SC-FDMA Based Radio Access. Wiley & Sons, Limited, John, 2009.

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LTE-Advanced: A Practical Systems Approach to Understanding 3GPP LTE Releases 10 and 11 Radio Access Technologies. Elsevier Science & Technology Books, 2013.

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Ahmadi, Sassan. LTE-Advanced: A Practical Systems Approach to Understanding 3GPP LTE Releases 10 and 11 Radio Access Technologies. Elsevier Science & Technology Books, 2013.

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Ahmadi, Sassan. LTE-Advanced: A Practical Systems Approach to Understanding 3GPP LTE Releases 10 and 11 Radio Access Technologies. Elsevier Science & Technology Books, 2017.

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WCDMA for UMTS: HSPA Evolution and LTE. Wiley & Sons, Incorporated, John, 2010.

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Toskala, Antti, i Harri Holma. WCDMA for UMTS: HSPA Evolution and LTE. Wiley & Sons, Incorporated, John, 2007.

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Toskala, Antti, i Harri Holma. WCDMA for UMTS: HSPA Evolution and LTE. Wiley & Sons, Incorporated, John, 2010.

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Części książek na temat "LTE Radio Access"

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Zhang, Huaqing, Sami Khairy, Lin X. Cai i Zhu Han. "Radio Access Management of U-LTE". W Resource Allocation in Unlicensed Long Term Evolution HetNets, 7–33. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68312-6_2.

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Safdar, Ghazanfar A. "Cognitive Radio Networks: Sensing, Access, Security". W LTE-Advanced and Next Generation Wireless Networks, 443–72. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118410998.ch16.

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Ayoob, Ayoob A., Gang Su, Desheng Wang, Muamer N. Mohammed i Omar A. Hammood. "Hybrid LTE-VANETs Based Optimal Radio Access Selection". W Recent Trends in Information and Communication Technology, 189–200. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59427-9_21.

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Sivaraj, Rajarajan, i Prasant Mohapatra. "Future Radio Access, Wi-Fi-LTE, LTE-Advanced: The Path to 5G". W Optical Networks, 3–41. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-42822-2_1.

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Kakadia, Deepak, Jin Yang i Alexander Gilgur. "Evolved Universal Terrestrial Radio Access Network (EUTRAN)". W Network Performance and Fault Analytics for LTE Wireless Service Providers, 61–81. New Delhi: Springer India, 2017. http://dx.doi.org/10.1007/978-81-322-3721-1_3.

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Shaddad, Redhwan Q., Mohammed A. Abdulwadood, Nada Y. Kuradah, Samar A. Alsharaie, Mohammed A. Qaid, Amal A. Alramesi i Akram A. Rassam. "Planning and Optimization of LTE Radio Access Network for Urban Area at Taiz City, Yemen". W Recent Trends in Information and Communication Technology, 285–93. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59427-9_31.

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Joy Persis, Bollampally, i Sakuru K. L. V. Sai Prakash. "A Novel SINR-Based Cooperative Radio Resource Allocation Mechanism (SBC-RRAM) for LTE/Wi-Fi Radio Access System in Smart Home Environment". W Lecture Notes in Electrical Engineering, 321–31. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8234-4_28.

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Shaddad, Redhwan Q., Nabil Y. Saleh, Aziz A. Mohammed, Zahi A. Saeed, Afif A. Shaif i Samir A. Al-Gaialni. "Planning and Optimization of LTE Radio Access Network for Suburban and Rural Area at Taiz City, Yemen". W Advances in Intelligent Systems and Computing, 440–50. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99007-1_42.

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Katdare, Ninad. "Obstacles and Optimisation of Oncology Services in India". W Improving Oncology Worldwide, 107–15. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-96053-7_14.

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AbstractIndia is a land of huge geographical, demographic and economic variations. As such, it has a very heterogeneous population and huge variations in the socio-economic status, access to health care and literacy. These provide unique challenges in the development of health-care policies. With other pressing health issues like malnutrition, maternal and child’s health and infectious diseases, there are no nationwide policies for cancer care. In addition to this, the health-care budget allocation compared to developed countries is abysmal. This has led to inequities in the distribution and availability of cancer care in India. With a majority of the patients ending up in the private sector for treatment, and because of misuse of technology in cancer care for profit because of dysregulated health care, there is inequity in distribution of cancer care. Lack of affordable care and inaccessible areas lead to many patients presenting very late and or dropping out of treatment, thus adversely affecting the prognosis. This is reflected in a disproportionately high mortality to incidence ratio. In this chapter, we will see the obstacles faced and the optimisation efforts to improve cancer care in India.
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Dahlman, Erik, Stefan Parkvall i Johan Sköld. "LTE Radio Access". W 4G: LTE/LTE-Advanced for Mobile Broadband, 103–19. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-12-419985-9.00007-6.

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Streszczenia konferencji na temat "LTE Radio Access"

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Sawahashi, Mamoru, Yoshihisa Kishiyama, Hidekazu Taoka, Motohiro Tanno i Takehiro Nakamura. "Broadband radio access: LTE and LTE-advanced". W 2009 International Symposium on Intelligent Signal Processing and Communications Systems (ISPACS 2009). IEEE, 2009. http://dx.doi.org/10.1109/ispacs.2009.5383862.

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Fragoso, Walter, Americo Correia i Nuno Souto. "Radio Access Network Emulator for LTE". W 2009 IEEE 5th International Conference on Wireless and Mobile Computing, Networking and Communications (WIMOB). IEEE, 2009. http://dx.doi.org/10.1109/wimob.2009.78.

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Kayama, Hidetoshi, i Huiling Jiang. "Evolution of LTE and new Radio Access technologies for FRA (Future Radio Access)". W 2014 48th Asilomar Conference on Signals, Systems and Computers. IEEE, 2014. http://dx.doi.org/10.1109/acssc.2014.7094809.

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Rezende, Pedro H. A., i Edmundo R. M. Madeira. "An adaptive network slicing for LTE radio access networks". W 2018 Wireless Days (WD). IEEE, 2018. http://dx.doi.org/10.1109/wd.2018.8361696.

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Abdel Alim, Onsy, Shawky Shaaban i Mohamed Nadder Hamdy. "Adaptive Multi Lane technique for LTE radio access VoIP". W 2011 International Conference on Advanced Technologies for Communications (ATC 2011). IEEE, 2011. http://dx.doi.org/10.1109/atc.2011.6027462.

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Jinseong Lee i Jaiyong Lee. "State transition latency reduction scheme in the LTE/LTE-A radio access network". W 2017 International Conference on Information Networking (ICOIN). IEEE, 2017. http://dx.doi.org/10.1109/icoin.2017.7899519.

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Naranjo, Juan Diego, Gerhard Bauch, Abdallah Bou Saleh, Ingo Viering i Rudiger Halfmann. "Interference protection mechanism for LTE-Advanced radio access networks supporting dynamic spectrum access". W 2013 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2013. http://dx.doi.org/10.1109/wcnc.2013.6555145.

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Alim, Onsy Abdel, Shawky Shaaban i Mohamed Nadder Hamdy. "Optimized Adaptive Multi Lane technique: For LTE radio access VoIP". W Signal Processing (WCSP 2011). IEEE, 2011. http://dx.doi.org/10.1109/wcsp.2011.6096884.

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Herranz, Carlos, Vicente Osa, Jose F. Monserrat, Daniel Calabuig, Narcis Cardona i Xavier Gelabert. "Cognitive Radio enabling opportunistic spectrum access in LTE-Advanced femtocells". W ICC 2012 - 2012 IEEE International Conference on Communications. IEEE, 2012. http://dx.doi.org/10.1109/icc.2012.6364735.

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Roy, Arghyadip, i Abhay Karandikar. "Optimal radio access technology selection policy for LTE-WiFi network". W 2015 13th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt). IEEE, 2015. http://dx.doi.org/10.1109/wiopt.2015.7151085.

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Raporty organizacyjne na temat "LTE Radio Access"

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Gestion de la pandémie de COVID-19 - Analyse de la dotation en personnel dans les centres d'hébergement de soins de longue durée du Québec au cours de la première vague. CIRANO, czerwiec 2023. http://dx.doi.org/10.54932/fupo1664.

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Faisant suite à une demande de la Commissaire à la santé et au bien-être, cette étude dresse un portrait de l'évolution de la main-d'oeuvre dans les centres d'hébergement de soins longue durée (CHSLD) avant et pendant la première vague de la pandémie de COVID-19. L’étude s’inscrit dans un effort méthodologique exploratoire visant à analyser l’adéquation entre l’offre de ressources humaines et les besoins des résidents à partir des données disponibles et des outils existants. Elle s’appuie sur un devis longitudinal rétrospectif et utilise des données administratives et clinico-administratives de quatre établissements : trois dans la grande région de Montréal, plus touchés par la première vague, et un établissement hors de la grande région de Montréal. L’étude a répondu aux trois questions suivantes : Dans quelle mesure l’offre de ressources humaines correspondait-elle aux besoins des résidents en CHSLD, avant et pendant la première vague de la pandémie ? Dans quelle mesure l’initiative Je Contribue et le recours aux agences de placement ont permis d’élargir le bassin de main-d’œuvre disponible ? Quelle a été l’ampleur de l’absentéisme et quel a été son impact sur le bassin de main-d’œuvre disponible ? Les auteurs comparent trois méthodes d’estimation des besoins : les profils Iso-SMAF, les ratios minimaux proposés par Voyer et coll. (2016) et les standards recommandés par les US Centers for Medicare and Medicaid Services. Les résultats montrent que les établissements ont fait preuve d’une grande capacité d’adaptation en mobilisant les ressources humaines nécessaires pour atteindre ou même dépasser les ratios minimaux requis. Le nombre de travailleurs de la santé pour 100 résidents a légèrement augmenté au cours de la première vague. Ceci tient compte du fait qu’au cours de la première vague, le nombre de résidents hébergés par établissement a diminué, probablement en raison des décès de plusieurs d’entre eux. L’analyse montre aussi que les établissements les plus touchés par la première vague ont pu maintenir un ratio travailleurs/résidents équivalent ou supérieur aux ratios observés durant la période prépandémie, et ce, malgré une augmentation de taux d’absentéisme de 75 % entre les deux périodes. Ces résultats doivent être interprétés avec prudence puisque l’analyse ne tient pas compte de facteurs plus qualitatifs comme le soutien des gestionnaires, la mobilité des ressources humaines ou la connaissance des pratiques cliniques et organisationnelles du personnel. Au-delà nombre de travailleurs et travailleuses, ces facteurs influencent grandement la performance ou la qualité des services offerts dans un contexte de crise sanitaire. Ce rapport est le deuxième volet d’un projet CIRANO plus large qui examinait sous divers angles les situations de fragilité qui ont pu affecter la performance du système de santé dans sa réponse à la pandémie. Un premier rapport publié en juin 2022 s’appuyait sur une enquête réalisée auprès de 2365 travailleuses et travailleurs. Ce premier volet s’intéressait à leurs perceptions quant aux ressources auxquelles ils ont eu accès et aux exigences et contraintes auxquelles ils ont dû faire face.
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