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Добірка наукової літератури з теми "LTE-Advanced, LTE-A"

Автор: Grafiati

Опубліковано: 8 червня 2022

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Статті в журналах з теми "LTE-Advanced, LTE-A"

Devi.J, Anjana, Dr R. Dhaya, and Dr R. Kanthavel. "A Survey on Multi-Layer Mimo for Lte/Lte-Advanced." International Journal of Engineering & Technology 7, no. 3.34 (September 1, 2018): 234. http://dx.doi.org/10.14419/ijet.v7i3.34.18972.

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The primary intention of the paper is to explore on various Multi-Layer MIMO approaches for the higher system performance. MIMO technique is said to be the key technology in LTE-A to achieve the spatial diversity in the system. Multi-Layer MIMO is the enhancement to the MIMO technology where multiple streams of data could be transferred to different layers for optimization with increased capacity in the network in high SNR condition. In a massive MIMO system, the cell interference hinders the system performance due to high channel dimensionality. The main design objective of the Multi-Layer MIMO techniques studied is to reduce the Cell Interference with lower complexity.

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MUBAROK, ARIF, and HASANAH PUTRI. "Analisis Dampak Inter-Band Carrier Aggregation pada Perencanaan Jaringan LTE-Advanced." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 7, no. 2 (May 24, 2019): 363. http://dx.doi.org/10.26760/elkomika.v7i2.363.

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ABSTRAKPenerapan teknologi Long Term Evolution (LTE) di Indonesia belum optimal dalam pengalokasian spektrum dikarenakan keterbatasan spektrum, untuk mengatasi masalah tersebut 3GPP mengeluarkan teknologi terbaru yaitu LTEAdvanced yang mendukung fitur carrier aggregation (CA) yang memberikan throughput yang lebih tinggi dengan penggunaan spektrum yang lebih efisien. Pada penelitian ini dilakukan perencanaan jaringan LTE-Advanced menggunakan metode inter-band CA dengan menggabungkan dua band frequency yang berbeda yaitu bandwith 5 MHz di band 5 (850 MHz) dan bandwidth 10 MHz di band 3 (1800 MHz). Untuk mendapatkan performansi yang maksimal perencanaan jaringan LTE dan LTE-A dikombinasikan dengan penggunaan skema Physical Cell Identity (PCI) dan Soft Frequency Reuse (SFR). Penggunaan PCI meningkatkan SINR sebesar 1 dB dan throughput meningkat sebesar 200 Kbps, sedangkan penggunaan skema SFR meningkatkan SINR sebesar 9 dB dan throughput meningkat sebesar 13 Mbps.Kata kunci: LTE-Advanced, PCI, SFR, Carrier Aggregation. ABSTRACTThe implementation of Long Term Evolution (LTE) technology in Indonesia has not been optimal due to spectrum limitations. To overcome the problem, 3GPP issued the latest technology, i.e. LTE-Advanced, to support the carrier aggregation (CA) feature that provides higher throughput with more efficient spectrum usage. In this study, LTE-Advanced network planning was performed using the inter-band CA method by combining two different band frequencies, namely 5 MHz bandwidth on Band 5 (850 MHz) and 10 MHz bandwidth on Band 3 (1800 MHz). In addition, to generate maximum performance, the LTE and LTEA networks planning was combined with the use of Physical Cell Identity (PCI) and Soft Frequency Reuse (SFR) schemes. The use of the PCI managed to increase SINR by 1 dB and throughput by 200 Kbps, while the use of SFR scheme managed to increase SINR by 9 dB and throughput by 13 Mbps.Keywords: LTE-Advanced, PCI, SFR, Carrier Aggregation.

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CHEN, Yun, Xubin CHEN, Zhiyuan GUO, Xiaoyang ZENG, and Defeng HUANG. "A 1.5Gb/s Highly Parallel Turbo Decoder for 3GPP LTE/LTE-Advanced." IEICE Transactions on Communications E96.B, no. 5 (2013): 1211–14. http://dx.doi.org/10.1587/transcom.e96.b.1211.

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Ku, Gwanmo, and John MacLaren Walsh. "Resource Allocation and Link Adaptation in LTE and LTE Advanced: A Tutorial." IEEE Communications Surveys & Tutorials 17, no. 3 (2015): 1605–33. http://dx.doi.org/10.1109/comst.2014.2383691.

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Zhioua, Ghayet El Mouna, Houda Labiod, Nabil Tabbane, and Sami Tabbane. "LTE Advanced Relaying Standard: A Survey." Wireless Personal Communications 72, no. 4 (April 7, 2013): 2445–63. http://dx.doi.org/10.1007/s11277-013-1157-1.

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Mostafa, Wessam, Eman Mohamed, and Abdelhalim Zekry. "Software implementation of LTE-advanced using Matlab Simulink." International Journal of Engineering & Technology 6, no. 4 (October 3, 2017): 116. http://dx.doi.org/10.14419/ijet.v6i4.7876.

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Long Term Evolution Advanced (LTE-A) is the evolution of the LTE that developed by 3rd Generation Partnership Project (3GPP).LTE-A exceeded International Telecommunication Union (ITU) requirements for 4th Generation (4G) known as International Mobile Telecommunications (IMT-Advanced). It is formally introduced in October 2009. This paper presents a study and an implementation of the LTE-A downlink physical layer based on 3GPP release 10 standards using Matlab simulink. In addition, it provides the LTE-A performance in terms of Bit Error Rate (BER) against Signal to Noise Ratio (SNR) for different modulation and channel coding schemes. Moreover, different scenarios of Carrier Aggregation (CA) are modeled and implemented. The Simulink model developed for the LTE-A transceiver can be translated into digital signal processor DSP code or VHDL on FPGA code.

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Zhang, Zhen, Huai Dong Xu, Yan Gu, and Chen Ming Li. "Study on Relay System Performance of Simulation Platform Based on LTE-A." Applied Mechanics and Materials 347-350 (August 2013): 1915–19. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.1915.

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Relay technology is an important technical means to achieve a smooth transition from Long Term Evolution (LTE) to LTE-Advanced (LTE-A). Theoretically, the addition of nodes will improve the performance of the system effectively. While the relay is active nodes, addition of nodes become a new source of interference. Based on the LTE-A simulation platform, the effect of relay node on the system is analyzed.

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Gómez, Gerardo, Javier Lorca, Raquel García, and Quiliano Pérez. "Towards a QoE-Driven Resource Control in LTE and LTE-A Networks." Journal of Computer Networks and Communications 2013 (2013): 1–15. http://dx.doi.org/10.1155/2013/505910.

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We propose a novel architecture for providing quality of experience (QoE) awareness to mobile operator networks. In particular, we describe a possible architecture for QoE-driven resource control for long-term evolution (LTE) and LTE-advanced networks, including a selection of KPIs to be monitored in different network elements. We also provide a description and numerical results of the QoE evaluation process for different data services as well as potential use cases that would benefit from the rollout of the proposed framework.

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J.T., Dr Devaraju, Dr Mohana H.K., and Nethra H.S. "Load Based Carrier Aggregation Algorithm for LTE Advanced." International Journal of Innovative Technology and Exploring Engineering 11, no. 6 (May 30, 2022): 53–60. http://dx.doi.org/10.35940/ijitee.f9917.0511622.

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Long Term Evolution (LTE) supports transmission bandwidth upto 20MHz. Nowadays the multimedia rich applications connects billions of users worldwide. These services demands more number of Resource Blocks (RBs) to satisfy the Quality of Service (QoS) requirements and that can increase the data traffic in multifold. This crunch has led the Mobile Network Operators (MNOs) to increase the transmission bandwidth in order to fulfil the QoS requirements of the different services. In Release10, Third Generation Partnership Project (3GPP) provides a provision for MNOs to use Carrier Aggregation (CA) scheme in LTE-Advanced to aggregate upto five Components Carriers (CCs) of existing LTE carriers at the eNB to increase the transmission bandwidth upto 100MHz. Further, this scheme allows a User Equipment (UE) to transmit and receive data packets simultaneously on multiple CCs based on UE capability to meet the service requirements. However, the CC selection and efficient RBs utilization plays a vital role to optimize the system performance. Hence, in this paper using QualNet 8.2 network simulator the Load Based Carrier Aggregation Algorithm (LBCAA) is proposed for LTE-Advanced to aggregate the CCs of the existing LTE carriers at the eNB based on cell load in order to increase the transmission bandwidth to handle the data traffic growth. The simulations results illustrated that the proposed LBCAA for LTE-Advanced outperforms in the achieved average unicast received throughput, average unicast end-to-end delay and jitter as compared to LTE.

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Dehghani, Mohammad, Kamran Arshad, and Richard MacKenzie. "LTE-Advanced Radio Access Enhancements: A Survey." Wireless Personal Communications 80, no. 3 (September 6, 2014): 891–921. http://dx.doi.org/10.1007/s11277-014-2062-y.

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Більше джерел

Дисертації з теми "LTE-Advanced, LTE-A"

Plaisner, Denis. "LTE-Advanced/WLAN testbed." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316419.

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This thesis deals with the investigation and assessment of communication standards LTE-Advance and WiFi (IEEE 802.11n/ac). The EVM error parameter is examined for each standard. To work with different standards a universal workplace have been proposed (testbed). This universal workplace serves for adjusting transmitting and receiving means and for processing signals transmitted and interpreted. Matlab was chosen for this work, through which only control devices such as generators and analyzers from Rohde & Schwarz. This workplace also measures the coexistence of these standards. At the conclusion of this thesis, different coexistence scenarios were designed and evaluated through testbed results.

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Shahid, Samiallah, and Saqib Mohammad. "Designing of LTE-Advanced Downlink Transceiver on a Physical Layer." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3100.

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The evolved version of LTE is LTE-Advanced which is being developed by 3GPP. LTE-Advanced will meet or go beyond the requirements of the International Telecommunication Union (ITU) for the fourth generation (4G) radio communication standard known as IMT-Advanced. LTEAdvanced is primarily considered as a part of Release 10 of 3GPP specifications. The LTE-Advanced specifications will continue to be developed in subsequent 3GPP releases. The complete physical layer structure has been employed by using the latest 3GPP standards. Furthermore, technologies such as Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) have also been implemented and integrated with LTEAdvanced. The Multiple Access Scheme in Advanced Mobile radio system has to meet the specific requirements such as: high throughput, robustness, efficient Bit Error Rate (BER), high spectral efficiency, minimum delays, low computational complexity, low Peak to Average Power Ratio (PAPR), low error probability etc. In order to investigate the LTE-Advanced transceiver a thorough study has been carried out using MATLAB Simulink using AWGN and Rayleigh fading channel. This report investigates the performance of OFDMA and various MIMO configurations of LTEAdvanced physical layer, along with diverse modulation techniques such 16QAM and QPSK,the results are then demonstrated on BER and signal to noise ratio graphs. AWGN and Rayleigh fading models are also used to determine the performance of LTE-Advanced in presence of noise and fading.

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Aubert, Sébastien. "Advanced Techniques for Achieving Near Maximum-Likelihood Soft Detection in MIMO-OFDM Systems and Implementation Aspects for LTE/LTE-A." Phd thesis, INSA de Rennes, 2011. http://tel.archives-ouvertes.fr/tel-00730797.

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Cette thèse traite des systèmes MIMO à multiplexage spatial, associés à la modulation OFDM. L'étude s'attarde particulièrement sur les systèmes 4x4, inclus ou à l'étude dans les normes 3GPP LTE et 3GPP LTE-A. Ces dimensions particulières nécessitent une étude de conception poussée du récepteur. Il s'agit notamment de proposer des détecteurs qui affichent à la fois de bonnes performances, une faible latence et une complexité de calcul réalisable dans un système embarqué. Le défi consiste plus particulièrement à proposer un détecteur offrant des performances quasi-optimales, tout en ne nécessitant qu'une complexité de calcul polynomiale. Une attention particulière est prêtée aux problèmes d'implantation. Ainsi, avantage est donné aux algorithmes à complexité fixe et permettant la réalisation d'opérations en parallèle. En réponse aux problématiques rencontrées, l'architecture du détecteur requiert une attention particulière. Le choix stratégique adopté est de chercher à transférer au prétraitement - qui ne dépend pas des données - le plus possible de complexité de calcul. Au cours de ce travail et suite à l'introduction du contexte général et des principaux pré-requis, l'inventaire des grandes tendances dans la littérature en ce qui concerne les détecteurs à décision dure est fait. Ils constituent le coeur du sujet et un détecteur original est proposé, incluant notamment les aspects de réduction de réseau et de décodage sphérique. Son avantage par rapport aux techniques existantes est ainsi démontré, et les résultats prometteurs sont maintenus lors de son extension à la décision souple. Comme attendu, le choix de transférer au prétraitement la complexité de calcul s'avère gagnant. Notamment, la réduction de complexité de calcul qu'il permet est présentée dans cette thèse. Parmi les principaux résultats, ce travail a débouché sur la proposition d'un détecteur original, qui a démontré un compromis entre performance et complexité de calcul efficace. Notamment, il requiert une complexité de calcul presque constante - selon les tailles de constellation -, tout en offrant des performances proches du maximum de vraisemblance. Par conséquent, le détecteur à décision souple proposé se positionne par rapport à l'état de l'art comme une solution d'une grande efficacité dans les systèmes 4x4.

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Mansor, Zuhanis. "MIMO exploitation of 3D multipath statistics in a heterogenous LTE-advanced network." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616887.

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The ever increasing demand for wireless mobile communication has led the Third Generation Partnership Project (3GPP) Long Term Evolution Advanced (LTE-Advanced) standard to exploit the latest advances in physical layer technologies; including Single Carrier- Frequency Division Multiple Access (SC-FDMA), Orthogonal Frequency Multiple Access (OFDMA) and Multiple-Input Multiple-Output (MIMO). This research is focused on the need to radically enhance the capacity and spectral efficiency of cellular networks via a combination of heterogeneous networks (HetNets) and MIMO antenna array optimisation. The peak-to-average-power ratio (PAPR) of SC-FDMA with time-domain pulse shaping and frequency-domain spectral shaping is investigated. This PAPR reduction can be used to enhance the power efficiency of the handset, or alternatively to improve the uplink throughput and/or operating range. Results have shown that a PAPR reduction of 1.5 dB can be achieved compared to the unfiltered version via Frequency Domain Spectral Shaping (FDSS). The impact of 3D multi path in an LTE-Advanced HetNet is further explored as the current 3GPPIITU channel model assumes 2D multipath statistics. Spatial and temporal multipath statistics are generated for example macro- and pico-cellular base stations and these are combined with appropriately oriented complex polarmetric antenna patterns. The resulting wideband channels are then passed to an LTE-Advanced physical layer (PHY) simulator. A powerful MATLAB simulator has been developed to mathematically model the LTE-Advanced uplink (UL) and downlink (DL) performance. The simulator is able to predict the received power, data throughput, bit error rate and packet error rate for each user in the network. The optimal spatial multiplexing mode is determined by computing the throughput for all modulation and coding schemes. This is achieved by calculating the received bit mutual information rate given knowledge of the radio channel. The fastest link speed for each user is identified with a packet error rate threshold of 10% or better. The handset is also rotated in the azimuth and elevation planes to evaluate performance sensitivity. The impact of base station array orientation is considered in both the azimuth and elevation planes. Results show that antenna orientation at the base station strongly influences user performance in an LTE-Advanced network. The deployment of macro-cellular vertical arrays is shown to significantly degrade network performance. In contrast, the elevation angle spread is found to be far greater, in pico-cells and this allows vertical arrays to be applied to produce compact high performance pico base stations. Results show that the pico-cells offer significantly higher data rates compared to the macro-cells. The results also show that for higher order modulation, macro-cells offer the lowest usage percentage (43%) compared to pico-cells (53-56%).

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Cavalcanti, Bruno Jácome. "Análise de modelos de predição de perdas de propagação em redes de comunicações LTE e LTE-Advanced usando técnicas de inteligência artificial." PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA E DE COMPUTAÇÃO, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/25061.

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A perfeita funcionalidade dos sistemas de comunicações de 3ª. e 4ª. gerações requerem, entre outras coisas, do conhecimento dos valores numéricos da predição das perdas de propagação dos sinais propagantes nos ambientes urbano, suburbano e rural. Portanto, o estudo das condições de propagação em um ambiente qualquer sempre será uma preocupação dos engenheiros projetistas. A análise e desenvolvimento de modelos robustos de predição de perdas de propagação em redes de comunicações Long Term Evolution (LTE) e Long Term Evolution Advanced (LTE-A) usando técnicas de Inteligência Artificial são realizadas neste trabalho. Os procedimentos metodológicos empregados foram aplicados no melhoramento da predição dos modelos de perda de propagação empíricos SUI, ECC-33, Ericsson 9999, TR 36.942 e o modelo do Espaço Livre, aplicados em redes LTE e LTE-A nas frequências de 800 MHz, 1800 MHz e 2600 MHz, para ambientes suburbanos em cidades de porte médio do nordeste do Brasil. Assim, nesta tese propõem-se dois modelos de Redes Neurais Artificiais (RNA): (i) o modelo de rede neural com entradas baseadas em erro (RNBE), utilizando como principal alimentador da rede o erro entre dados medidos e simulados, e, (ii) o modelo de rede neural com entradas baseadas no terreno (RNBT). O desempenho desses modelos foram comparados com os modelos de propagação considerados no trabalho e também as versões otimizadas utilizando Algoritmos Genéticos (AG) e o Método dos Mínimos Quadrados (LMS). Também foram realizadas comparações com valores medidos, obtidos a partir de uma campanha de medição realizada na cidade de Natal, Estado do Rio Grande do Norte. Os resultados finais obtidos através de simulações e medições apresentaram boas concordâncias métricas, com destaque para a performance do modelo RNBE. A principal contribuição dessa tese é que, ao utilizar essas técnicas que fazem uso de maneira mais eficiente dos modelos de propagação empíricos, pode-se estimar sinais propagantes realistas, evitando erros no planejamento e implementações de redes sem fio LTE e LTE-A em áreas suburbanas.
The perfect functionality of the 3rd and 4th generation of wireless systems requires, among other parameters, knowledge of the numerical values of the prediction of loss of propagation of propagation signals in urban, suburban and rural environments. Therefore, the study of propagation conditions in any environment will always be a concern of design engineers. The analysis and development of robust propagation loss prediction models in Long Term Evolution (LTE) and Long Term Evolution Advanced (LTE-A) communications networks using Artificial Intelligence techniques is performed in this work. The methodologies used were applied to improve the prediction of loss of empirical propagation SUI, ECC-33, Ericsson 9999, TR 36.942 models and the Free Space model applied in LTE and LTE-A networks in the frequencies of 800 MHz, 1800 MHz and 2600 MHz, for suburban environments in mid-sized cities in northeastern Brazil. Thus, in these thesis two models of Artificial Neural Networks (RNA) are proposed: (i) the neural network model with inputs based on error (RNBE) using as main feeder of the network the error between measured and simulated data, and (ii) the neural network model with land-based inputs (RNBT). The performance of these models was compared with the models of propagation considered in the work and also the versions optimized using Genetic Algorithms (AG) and the Least Square Method (LMS). Comparisons were also made with measured values, obtained from a measurement campaign carried out in the city of Natal, state of Rio Grande do Norte. The final results obtained through simulations and measurements presented good metric concordances, with emphasis on the performance of the RNBE model. Thus, the main contribution of this thesis is that, by using these techniques that make more efficient use of empirical propagation models, we can estimate realistic propagation signals, avoiding errors in the planning and implementations of LTE and LTE- A wireless networks in suburban areas.

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Sawant, Uttara. "Evaluation of Call Mobility on Network Productivity in Long Term Evolution Advanced (LTE-A) Femtocells." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062893/.

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The demand for higher data rates for indoor and cell-edge users led to evolution of small cells. LTE femtocells, one of the small cell categories, are low-power low-cost mobile base stations, which are deployed within the coverage area of the traditional macro base station. The cross-tier and co-tier interferences occur only when the macrocell and femtocell share the same frequency channels. Open access (OSG), closed access (CSG), and hybrid access are the three existing access-control methods that decide users' connectivity to the femtocell access point (FAP). We define a network performance function, network productivity, to measure the traffic that is carried successfully. In this dissertation, we evaluate call mobility in LTE integrated network and determine optimized network productivity with variable call arrival rate in given LTE deployment with femtocell access modes (OSG, CSG, HYBRID) for a given call blocking vector. The solution to the optimization is maximum network productivity and call arrival rates for all cells. In the second scenario, we evaluate call mobility in LTE integrated network with increasing femtocells and maximize network productivity with variable femtocells distribution per macrocell with constant call arrival rate in uniform LTE deployment with femtocell access modes (OSG, CSG, HYBRID) for a given call blocking vector. The solution to the optimization is maximum network productivity and call arrival rates for all cells for network deployment where peak productivity is identified. We analyze the effects of call mobility on network productivity by simulating low, high, and no mobility scenarios and study the impact based on offered load, handover traffic and blocking probabilities. Finally, we evaluate and optimize performance of fractional frequency reuse (FFR) mechanism and study the impact of proposed metric weighted user satisfaction with sectorized FFR configuration.

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Abdi, Abyaneh Mohammad. "Génération des signaux agrégés en fréquences dans le contexte de LTE-A." Electronic Thesis or Diss., Paris, ENST, 2016. https://pastel.hal.science/tel-03689710.

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Dans ce travail de thèse, on a proposé une structure de génération des signaux multi-porteuse afin de créer plusieurs oscillateurs locaux (OL ) tout en utilisant qu’un modulateur I/Q. Ces signaux peuvent être utilisés dans les récepteurs de LTE-A pour la transposition des signaux agrégé en fréquence vers la bande de base. On développe la structure afin de l’utiliser en émetteur répondant aux normes du standard LTE-A. La nouvelle structure nous permet de générer n signaux agrégés en fréquences, de manière simultanée, par une seule chaîne de transmission (c.a.d un modulateur I/Q, un OL). En utilisant cette structure on réduit le nombre de circuits utilisés, en comparaison du cas où n signaux agrégés en fréquences sont générés par n émetteurs. La fréquence d’échantillonnage est réduite dans notre cas par rapport au cas où les signaux sont générés directement de la bande de base à la bande RF avec des convertisseurs analogiques numériques adéquats. Dans la troisième partie, on se concentre sur les imperfections et les non linéarités du modulateur I/Q dans le cadre de notre structure multibande. On modélise le fonctionnement du modulateur multi-bande en utilisant les échantillons en entrée et en sortie. Notre modèle est dérivé de la série de Volterra qui prends en compte les effets non linéaires et les effets mémoires ainsi que les imperfections du modulateur I/Q. Puis, on obtient la fonction "inverse" du modèle et on l’applique à l’entrée du modulateur afin de corriger et linéariser la sortie du modulateur I/Q. La fonction "inverse" est appelée DPD (en anglais : Digital Pre-Distortion). Enfin, on a évalué le modèle et la DPD en simulations et en mesures
In this dissertation, a signal generation structure is proposed using which a multitone Local Oscillator (LO) signal is created by a single I/Q modulator. These LOs can be used in the CA receivers to down-convert the transmitted component carriers simultaneously. The multi-tone LO signal structure is further developed to be used at the transmitter as a CA generation solution. Using the proposed structure n-component carriers can be generated in parallel. This structures requires lower sampling rates with respect to the case where RF signals are synthesized directly by digital-to- analog converters. Moreover, less circuitry is required, because one single I/Q modulator is used to generate n component carriers, instead of n I/Q modulators. This work follows on investigating the origin of impairments and mild nonlinearities in our I/Q modulator. To overcome these problems, we focus on the functionality of the overall system rather than each component of the I/Q modulator. This method is called behavioral modeling. Once the nonlinear model is obtained, if its inverse function is applied to the input, a linearized output is expected. The generation of the inverse function is called Digital Pre-Distortion (DPD). We propose a tri-band behavioral model for nonlinearities and impairments in tri-band CA using our I/Q modulator. Furthermore, the DPD of the model is evaluated in simulations and experiments

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Ben, Rekhissa Hajer. "Réduction de la consommation énergétique dans les modules M2M utilisant la technologie LTE/LTE-A." Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4085.

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A l’heure actuelle, la communication des machines est devenue une technologie incontournable, en pleine expansion vue le nombre de services qu'elle est capable de proposer. La technologie M2M (Machineto-Machine) se définit comme le mariage des technologies de l’information et de la communication avec des objets intelligents. Les réseaux cellulaires, tel que les technologies Long Term Evolution (LTE) et LTEAdvanced (LTE-A), sont de plus en plus utilisés afin d'assurer la communication des modules M2M. Cependant, adapter les réseaux LTE et LTE-A afin de satisfaire aux caractéristiques et exigences des modules M2M, en termes de qualité de service (QoS) et consommation énergétique, est crucial. L'objectif de cette thèse est de proposer des solutions de réduction de la consommation énergétique pour les modules M2M utilisant les technologies LTE et LTE-A. Pour ce faire deux approches ont été proposées. La première approche consiste à stocker les paquets de données dans une mémoire tampon jusqu'à atteindre un seuil donné du nombre de paquets stockés et du délai maximal autorisé. Ceci permet d'augmenter le temps passé en mode basse consommation et de réduire le passage du mode veille au mode connecté, tout en tenant en compte des contraintes de délai. La deuxième approche consiste à proposer deux techniques d'allocation de ressources radio en voie montante qui permettent de réduire la consommation énergétique dans les modules M2M tout en satisfaisant la QoS requise en termes de délai de transmission
Machine-to-Machine (M2M) communication, which refers to the interaction between intelligent devices without human intervention, is gaining more prominence in mobile cellular networks. Long Term Evolution (LTE) and LTE-Advanced (LTE-A) networks are considered excellent candidates to support M2M communication. However, M2M communication over LTE/LTE-A networks faces some challenges. The main challenge is how to reduce energy consumption for M2M devices, as the majority of them are battery driven. The aim of this thesis is to propose solutions to reduce energy consumption in M2M devices over LTE/LTE-A technologies. We proposed two approaches; the first one consists of increasing time spent in low power mode by buffering data until reaching given thresholds of number of buffered data and maximum delay authorized. This approach allows to reduce signaling from idle state to connected state. Besides, it considers quality of service (QoS) requirements. The second approach consists of proposing two uplink schedulers which take into account the coexistence of M2M and Human-to-Human (H2H) devices. Both of them consider channel quality while allocating resource blocks, which have a consequence reducing energy consumption in M2M devices. Our second algorithm consider, also, delay constraint

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SANTOS, Marcos Graciano. "Mecanismos de Identificação de Proximidade e Alocação de Recursos para uma Comunicação D2D Energeticamente Eficiente em Redes LTE-A." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/11573.

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Submitted by Lucelia Lucena (lucelia.lucena@ufpe.br) on 2015-03-09T19:50:50Z No. of bitstreams: 2 DISSERTAÇÃO Marcos Graciano Santos.pdf: 3653832 bytes, checksum: 63b7958428e143779e52059edac458d4 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)
Made available in DSpace on 2015-03-09T19:50:50Z (GMT). No. of bitstreams: 2 DISSERTAÇÃO Marcos Graciano Santos.pdf: 3653832 bytes, checksum: 63b7958428e143779e52059edac458d4 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2014-08-11
Atualmente, mais de 200 milhões de usuários utilizam as redes 3G/LTE (Long Term Evolution). Com este aumento crescente de usuários com acesso sem fio, muitas pesquisas se concentram no esforço de desenvolvimento de soluções que permitam atender às demandas de redes com alta disponibilidade e altas taxas de transmissão sem considerar, em geral, as limitações de bateria dos dispositivos. Como requisito do LTE Advanced (especificações para a Quarta Geração de comunicações móveis) incluem-se os Serviços de Proximidade, comunicação denominada de dispositivo a dispositivo (D2D, do inglês: device-to-device) para atender ao desenvolvimento de novas demandas de serviços, como jogos e vídeos on-line ou transferência de conteúdos, aplicações que, a cada dia, requerem maiores consumos de energia. Neste trabalho, realizamos medições que avaliam o consumo da comunicação dispositivo-estação base e propomos primeiramente um algoritmo de identificação de pares de dispositivos e definição de limiares de referência, diferentemente de outros trabalhos, com base nas características de consumo dos dispositivos, que viabilize comunicação direta D2D energeticamente mais eficiente que a comunicação convencional via estação rádio base. Em seguida, para cenários de grande aglomeração de pessoas, uma alternativa de serviço de disponibilização de conteúdos ou transferência de arquivos através de um novo padrão de alocação de recursos, utilizando o modo duplex por divisão no tempo (TDD – Time Duplex Division). Foram considerados cinco modelos de propagação distintos para comparação do desempenho, tomando como base uma situação real num parque do Recife considerando a transmissão de um vídeo em alta definição. Por fim, tratamos a questão da segurança com uma criptografia específica entre os dispositivos próximos. Os resultados são avaliados via simulação utilizando-se o Matlab, demonstrando a eficácia da solução com reduções de até 43% no consumo de energia da bateria do dispositivo.

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Anoh, Kelvin Ogbonnaya Okorie. "Advanced MIMO-OFDM technique for future high speed braodband wireless communications : a study of OFDM design, using wavelet transform, fractional fourier transform, fast fourier transform, doppler effect, space-time coding for multiple input, multiple output wireless communications systems." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14400.

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This work concentrates on the application of diversity techniques and space time block coding for future high speed mobile wireless communications on multicarrier systems. At first, alternative multicarrier kernels robust for high speed doubly-selective fading channel are sought. They include the comparisons of discrete Fourier transform (DFT), fractional Fourier transform (FrFT) and wavelet transform (WT) multicarrier kernels. Different wavelet types, including the raised-cosine spectrum wavelets are implemented, evaluated and compared. From different wavelet families, orthogonal wavelets are isolated from detailed evaluations and comparisons as suitable for multicarrier applications. The three transforms are compared over a doubly-selective channel with the WT significantly outperforming all for high speed conditions up to 300 km/hr. Then, a new wavelet is constructed from an ideal filter approximation using established wavelet design algorithms to match any signal of interest; in this case under bandlimited criteria. The new wavelet showed better performance than other traditional orthogonal wavelets. To achieve MIMO communication, orthogonal space-time block coding, OSTBC, is evaluated next. First, the OSTBC is extended to assess the performance of the scheme over extended receiver diversity order. Again, with the extended diversity conditions, the OSTBC is implemented for a multicarrier system over a doubly-selective fading channel. The MIMO-OFDM systems (implemented using DFT and WT kernels) are evaluated for different operating frequencies, typical of LTE standard, with Doppler effects. It was found that, during high mobile speed, it is better to transmit OFDM signals using lower operating frequencies. The information theory for the 2-transmit antenna OSTBC does not support higher order implementation of multi-antenna systems, which is required for the future generation wireless communications systems. Instead of the OSTBC, the QO-STBC is usually deployed to support the design of higher order multi-antenna systems other than the 2-transmit antenna scheme. The performances of traditional QO-STBC methods are diminished by some off-diagonal (interference) terms such that the resulting system does not attain full diversity. Some methods for eliminating the interference terms have earlier been discussed. This work follows the construction of cyclic matrices with Hadamard matrix to derive QO-STBC codes construction which are N-times better than interference free QO-STBC, where N is the number of transmit antenna branches.

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Книги з теми "LTE-Advanced, LTE-A"

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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Santillán LIma, Juan Carlos, Nestor Augusto Estrada Brito, Santiago Israel Logroño Naranjo, and José Hernán Negrete Costales. EVALUACIÓN DEL RENDIMIENTO DE ACCESO MÚLTIPLE NO-ORTOGONAL (NOMA) EN SISTEMAS LTE (LONG TERM EVOLUTION). Edited by Fernando TIverio Molina Granja. I2D Editorial Académica, 2022. http://dx.doi.org/10.55204/i2d.4.

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Debido a la creciente demanda de datos a través de las redes móviles, se están considerando nuevas técnicas que incrementen la eficiencia espectral. El acceso múltiple no-ortogonal (Non-Orthogonal Multiple Access, NOMA) es una de las técnicas que están siendo evaluadas dentro del 3GPP (Third Generation Partnership Project). NOMA, también conocida como LDM (Layered-Division-Multiplexing), proporciona servicios a múltiples usuarios mediante multiplexación en potencia. Debido la utilización del 100% del tiempo y ancho de banda del sistema mediante el uso de esta técnica, se espera conseguir una mayor eficiencia espectral que las tecnologías de acceso múltiple ortogonales convencionales TDM (Time Division Multiplexing) o FDM (Frequency Division Multiplexing). Esta ganancia ya ha sido demostrada en el nuevo estándar de televisión digital terrestre ATSC (Advanced Television Systems Committee), ATSC 3.0. En este trabajo se evaluará la utilización de NOMA en sistemas LTE (Long Term Evolution) mediante simulaciones de capa física, y se compararán las ganancias obtenidas con las publicadas en la bibliografía de ATSC 3.0. Así también se hace una revisión de las aplicaciones de la telefonía celular, principalmente de LTE en la seguridad industrial.

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Частини книг з теми "LTE-Advanced, LTE-A"

Penttinen, Jyrki T. J., and Juha Kallio. "LTE-A Functionality." In The LTE-Advanced Deployment Handbook, 205–36. Chichester, United Kingdom: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118678879.ch07.

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Penttinen, Jyrki T. J., Sebastian Lasek, Katarzyna Rybiańska, Krzysztof Wiśniowski, Jacek Góra, Krystian Safjan, Jarosław Lachowski, et al. "LTE-A Radio Network." In The LTE-Advanced Deployment Handbook, 113–78. Chichester, United Kingdom: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118678879.ch05.

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Penttinen, Jyrki T. J., Elpiniki Tsakalaki, and Parth Amin. "Optimization of LTE-A." In The LTE-Advanced Deployment Handbook, 293–338. Chichester, United Kingdom: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118678879.ch10.

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Elnashar, Ayman, and Mohamed A. El-saidny. "4G Advanced Features and Roadmap Evolutions from LTE to LTE-A." In Design, Deployment and Performance of 4G-LTE Networks, 507–45. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118703434.ch8.

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Srikanth Kamath, H., Samarendra Nath Sur, Hmdard Singh, and Aayush Khanna. "Heterogeneous Networks in LTE-Advanced: A Review." In Advances in Communication, Devices and Networking, 11–18. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4932-8_2.

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Yuan, Yifei. "LTE-A Relay Scenarios and Evaluation Methodology." In LTE-Advanced Relay Technology and Standardization, 9–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29676-5_2.

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Yuan, Yifei. "LTE-A Relay Study and Related Technologies." In LTE-Advanced Relay Technology and Standardization, 39–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29676-5_3.

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Furqan, Fatima, and Doan B. Hoang. "LTE_FICC: A New Mechanism for Provision of QoS and Congestion Control in LTE/LTE-Advanced Networks." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 768–81. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11569-6_67.

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Chauhan, Vikas, and Amandeep. "A Review on Resource Allocation in Heterogeneous LTE-Advanced Networks." In International Conference on Intelligent Data Communication Technologies and Internet of Things (ICICI) 2018, 1122–27. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03146-6_130.

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Lee, Byung-Bog, Jaehak Yu, and Se-Jin Kim. "A Distributed and Intelligent Power Control Scheme in LTE-Advanced Femtocell Networks." In Lecture Notes in Electrical Engineering, 317–25. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4516-2_31.

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Тези доповідей конференцій з теми "LTE-Advanced, LTE-A"

Warabino, Takayuki, Shoji Kaneko, Shinobu Nanba, and Yoji Kishi. "Advanced load balancing in LTE/LTE-A cellular network." In 2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC 2012). IEEE, 2012. http://dx.doi.org/10.1109/pimrc.2012.6362842.

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Bojovic, Biljana, Melchiorre Danilo Abrignani, Marco Miozzo, Lorenza Giupponi, and Nicola Baldo. "Towards LTE-Advanced and LTE-A Pro Network Simulations." In the Workshop. New York, New York, USA: ACM Press, 2017. http://dx.doi.org/10.1145/3067665.3067669.

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Noh, Jung-Hoon, and Seong-Jun Oh. "System-Level Simulation of LTE/LTE-A for IMT-Advanced Systems." In 2011 IEEE Vehicular Technology Conference (VTC 2011-Spring). IEEE, 2011. http://dx.doi.org/10.1109/vetecs.2011.5956445.

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Feki, Souhir, Faouzi Zarai, and Aymen Belghith. "A Q-learning-based Scheduler Technique for LTE and LTE-Advanced Network." In 14th International Conference on Wireless Networks and Mobile Systems. SCITEPRESS - Science and Technology Publications, 2017. http://dx.doi.org/10.5220/0006425200270035.

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Shi, Yi, Mingchao Li, Xin Xiong, Guanglin Han, Lei Wan, and Xiaodai Dong. "A flexible backhaul architecture for LTE-Advanced." In 2014 International Conference on Connected Vehicles and Expo (ICCVE). IEEE, 2014. http://dx.doi.org/10.1109/iccve.2014.7297520.

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Miyim, A. M., Mahamod Ismail, R. Nordin, and M. T. Ismail. "A Multi-Layer Network Selection Function for downlink handover scheme in LTE and LTE-advanced." In 2011 IEEE Student Conference on Research and Development (SCOReD). IEEE, 2011. http://dx.doi.org/10.1109/scored.2011.6148709.

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Khabazian, Mehdi, Osama Kubbar, and Hossam Hassanein. "A fairness-based preemption algorithm for LTE-Advanced." In GLOBECOM 2012 - 2012 IEEE Global Communications Conference. IEEE, 2012. http://dx.doi.org/10.1109/glocom.2012.6503966.

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Bae, Jung Hyun, Sungsoo Kim, Jungwon Lee, and Inyup Kang. "Advanced downlink MU-MIMO receiver for 3GPP LTE-A." In ICC 2012 - 2012 IEEE International Conference on Communications. IEEE, 2012. http://dx.doi.org/10.1109/icc.2012.6364917.

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Meng, Yan, Mingli You, and Jin Liu. "A novel transmit diversity scheme for LTE-Advanced uplink." In 2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC 2009). IEEE, 2009. http://dx.doi.org/10.1109/pimrc.2009.5450376.

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Grigoriou, Elisavet, Theocharis Saoulidis, Luigi Atzori, Virginia Pilloni, and Periklis Chatzimisios. "A QoE monitoring solution for LTE-Advanced Pro networks." In 2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD). IEEE, 2018. http://dx.doi.org/10.1109/camad.2018.8514946.

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