74 research outputs found
A Survey on Applications of Cache-Aided NOMA
Contrary to orthogonal multiple-access (OMA), non-orthogonal multiple-access (NOMA) schemes can serve a pool of users without exploiting the scarce frequency or time domain resources. This is useful in meeting the future network requirements (5G and beyond systems), such as, low latency, massive connectivity, users' fairness, and high spectral efficiency. On the other hand, content caching restricts duplicate data transmission by storing popular contents in advance at the network edge which reduces data traffic. In this survey, we focus on cache-aided NOMA-based wireless networks which can reap the benefits of both cache and NOMA; switching to NOMA from OMA enables cache-aided networks to push additional files to content servers in parallel and improve the cache hit probability. Beginning with fundamentals of the cache-aided NOMA technology, we summarize the performance goals of cache-aided NOMA systems, present the associated design challenges, and categorize the recent related literature based on their application verticals. Concomitant standardization activities and open research challenges are highlighted as well
D6.3 Intermediate system evaluation results
The overall purpose of METIS is to develop a 5G system concept that fulfil s the requirements of the beyond-2020 connected information society and to extend today’s wireless communication systems for new usage cases. First, in this deliverable an updated view on the
overall METIS 5G system concept is presented.
Thereafter, simulation results for the most promising technology components supporting the METIS 5G system concept are reported.
Finally, s
imulation results are presented for
one
relevant
aspect of each Horizontal Topic:
Direct Device
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to
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Device Communication, Massive Machine Communication, Moving Networks,
Ultra
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Dense Networks, and Ultra
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Reliable Communication.Popovski, P.; Mange, G.; Fertl, P.; Gozálvez - Serrano, D.; Droste, H.; Bayer, N.; Roos, A.... (2014). D6.3 Intermediate system evaluation results. http://hdl.handle.net/10251/7676
Implementação e avaliação no system generator de um sistema cooperativo para os futuros sistemas 5G
With the arrival of 5G it is expected the proliferation of services in the
different fields such as healthcare, utility applications, industrial automation,
4K streaming, that the former networks can not provide. Additionally,
the total number of wireless communication devices will escalate in such
a manner that the already scarce available frequency bandwidth won’t be
enough to pack the intended objectives. Cisco’s Annual Internet Report from
2018 predicts that by 2023 there will be nearly 30 billion devices capable of
wireless communication. Due to the exponential expiation of both services
and devices, the challenges upon both network data capacity and efficient
radio resourse use will be greater than ever, thus the urgency for solutions
is grand.
Both the capacity for wireless communications and spectral efficiency are
related to cell size and its users proximity to the access point. Thus,
shortening the distance between the transmitter and the receiver improves
both aspects of the network. This concept is what motivates the
implementation of heterogeneous networks, HetNets, that are composed
of many different small-cells, SCs, overlaid across the same coexisting
area of a conventional macro-cell, shortening the distance between the
cell users and its access point transceivers, granting a better coverage and
higher data rates. However, the HetNets potential does not come without
any challenges, as these networks suffer considerably from communication
interference between cells.
Although some interference management algorithms that allow coexistence
between cells have been proposed in recent years, most of them were
evaluated by software simulations and not implemented in real-time
platforms. Therefore, this master thesis aims to give the first step on the
implementation and evaluation of an interference mitigation technique in
hardware. Specifically, it is assumed a downlink scenario composed by a
macro-cell base station, a macro-cell primary user and a small cell user,
with the aim of implementing an algorithm that eliminates the downlink
interference that the base station may cause to the secondary users. The
study was carried out using the System Generator DSP tool, which is a tool
that generates code for hardware from schematics created in it. This tool
also offers a wide range of blocks that help the creation, and fundamentally,
the simulation and study of the system to be implemented, before being
translated into hardware. The results obtained in this work are a faithful
representation of the behavior of the implemented system, which can be
used for a future application for FPGA.Com a chegada do 5G, espera-se a proliferação de serviços nas mais diversas
áreas tal como assistência médica, automação industrial, transmissão em
4k, que não eram possíveis nas redes das gerações anteriores. Além deste
fenómeno, o número total de dispositivos capazes de conexões wireless
aumentará de tal maneira que a escassa largura de banda disponível não
será suficiente para abranger os objetivos pretendidos. O Relatório Anual
de 2018 sobre a Internet da Cisco prevê que até 2023 haverá quase 30
bilhões de dispositivos capazes de comunicação sem fio. Devido ao aumento
exponencial de serviços e dispositivos, os desafios sobre a capacidade de
dados da rede e o udo eficiente dos recursos de rádio serão maiores que
nunca. Por estes motivos, a necessidade de soluções para estas lacunas é
enorme.
Tanto a capacidade da rede e o uso eficiente do espectro de frequências
estão relacionados ao tamanho da célula e à proximidade dos usuários com
o ponto de acesso da célula. Ao encurtar a distância entre o transmissor e
o recetor ocorre um melhoramento destes dois aspetos da rede. Este é o
principal conceito na implementação de redes heterogéneas, HetNets, que
são compostas por diversas células pequenas que coexistem na área de uma
macro célula convencional, diminuído a distância entre os utilizadores da
célula e os pontos de acesso, garantindo uma melhor cobertura e taxa de
dados mais elevadas. No entanto, o potencial das HatNets não vem sem
nenhum custo, pois estas redes sofrem consideravelmente de interferência
entre as células.
Embora nos últimos anos foram propostos alguns algoritmos que permitem
a coexistência das células, a maioria destes foi só testado em simulações
de software e não em plataformas em tempo real. Por esse motivo, esta
dissertação de mestrado visa dar o primeiro passo na implementação e
a avaliação de uma técnica de mitigação de interferência em hardware.
Mais especificamente no cenário de downlink entre uma estação base de
uma macro célula, um utilizador primário da macro célula e um utilizador
secundário de uma célula pequena, com o principal objetivo de cancelar a
interferência que a estação base possa fazer ao utilizador secundário. O
estudo foi realizado utilizando a ferramenta System Generator DSP, que é
uma ferramenta que gera código para hardware a partir de esquemáticos
criados na mesma. Esta ferramenta também oferece uma vasta gama de
blocos que ajudam a criação, e fundamentalmente, a simulação e o estudo do
sistema a implementar antes de ser traduzido para hardware. Os resultados
obtidos neste trabalho são uma fiel representação do comportamento do
sistema implementado. O quais podem ser utilizados para uma futura
aplicação para FPGA.Mestrado em Engenharia Eletrónica e Telecomunicaçõe
D3.2 First performance results for multi -node/multi -antenna transmission technologies
This deliverable describes the current results of the multi-node/multi-antenna technologies
investigated within METIS and analyses the interactions within and outside Work Package 3.
Furthermore, it identifies the most promising technologies based on the current state of
obtained results. This document provides a brief overview of the results in its first part. The second part, namely the Appendix, further details the results, describes the simulation
alignment efforts conducted in the Work Package and the interaction of the Test Cases. The
results described here show that the investigations conducted in Work Package 3
are maturing resulting in valuable innovative solutions for future 5G systems.Fantini. R.; Santos, A.; De Carvalho, E.; Rajatheva, N.; Popovski, P.; Baracca, P.; Aziz, D.... (2014). D3.2 First performance results for multi -node/multi -antenna transmission technologies. http://hdl.handle.net/10251/7675
D6.6 Final report on the METIS 5G system concept and technology roadmap
This deliverable presents the METIS 5G system concept which was developed to fulfil the
requirements of the beyond-2020 connected information society and to extend today’s
wireless communication systems to include new usage scenarios.
The METIS 5G system concept consists of three generic 5G services and four main enablers.
The three generic 5G services are Extreme Mobile BroadBand (xMBB), Massive Machine-
Type Communications (mMTC), and Ultra-reliable Machine-Type Communication (uMTC).
The four main enablers are Lean System Control Plane (LSCP), Dynamic RAN, Localized
Contents and Traffic Flows, and Spectrum Toolbox.
An overview of the METIS 5G architecture is given, as well as spectrum requirements and
considerations.
System-level evaluation of the METIS 5G system concept has been conducted, and we conclude that the METIS technical objectives are met.
A technology roadmap outlining further 5G development, including a timeline and recommended future work is given.Popovski, P.; Mange, G.; Gozalvez -Serrano, D.; Rosowski, T.; Zimmermann, G.; Agyapong, P.; Fallgren, M.... (2014). D6.6 Final report on the METIS 5G system concept and technology roadmap. http://hdl.handle.net/10251/7676
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