104 research outputs found
Full Duplex Emulation via Spatial Separation of Half Duplex Nodes in a Planar Cellular Network
A Full Duplex Base Station (FD-BS) can be used to serve simultaneously two
Half-Duplex (HD) Mobile Stations (MSs), one working in the uplink and one in
the downlink, respectively. The same functionality can be realized by having
two interconnected and spatially separated Half Duplex Base Stations (HD-BSs),
which is a scheme termed \emph{CoMPflex} (CoMP for In-Band Wireless Full
Duplex). A FD-BS can be seen as a special case of CoMPflex with separation
distance zero. In this paper we study the performance of CoMPflex in a
two-dimensional cellular scenario using stochastic geometry and compare it to
the one achieved by FD-BSs. By deriving the Cumulative Distribution Functions,
we show that CoMPflex brings BSs closer to the MSs they are serving, while
increasing the distance between a MS and interfering MSs. Furthermore, the
results show that CoMPflex brings benefits over FD-BS in terms of communication
reliability. Following the trend of wireless network densification, CoMPflex
can be regarded as a method with a great potential to effectively use the dense
HD deployments.Comment: to appear in IEEE SPAWC 201
On a User-Centric Base Station Cooperation Scheme for Reliable Communications
In this paper, we describe CoMP2flex, a user-centric base station (BS)
cooperation scheme that provides improvements in reliability of both uplink
(UL) and downlink (DL) communications of wireless cellular networks. CoMP2flex
supports not only cooperation of two BSs with same direction of traffic but
also cooperation of two BSs serving bidirectional traffic. The reliability
performance of CoMP2flex is shown with numerical simulations and analytical
expressions. We quantify and numerically validate the performance of the greedy
BS pairing algorithm by comparing maximum weight matching methods, implemented
as the Edmonds matching algorithm for weighted graphs.Comment: to be presented in IEEE VTC 2017 Sprin
Cooperative Radio Communications for Green Smart Environments
The demand for mobile connectivity is continuously increasing, and by 2020 Mobile and Wireless Communications will serve not only very dense populations of mobile phones and nomadic computers, but also the expected multiplicity of devices and sensors located in machines, vehicles, health systems and city infrastructures. Future Mobile Networks are then faced with many new scenarios and use cases, which will load the networks with different data traffic patterns, in new or shared spectrum bands, creating new specific requirements. This book addresses both the techniques to model, analyse and optimise the radio links and transmission systems in such scenarios, together with the most advanced radio access, resource management and mobile networking technologies. This text summarises the work performed by more than 500 researchers from more than 120 institutions in Europe, America and Asia, from both academia and industries, within the framework of the COST IC1004 Action on "Cooperative Radio Communications for Green and Smart Environments". The book will have appeal to graduates and researchers in the Radio Communications area, and also to engineers working in the Wireless industry. Topics discussed in this book include: ⢠Radio waves propagation phenomena in diverse urban, indoor, vehicular and body environments⢠Measurements, characterization, and modelling of radio channels beyond 4G networks⢠Key issues in Vehicle (V2X) communication⢠Wireless Body Area Networks, including specific Radio Channel Models for WBANs⢠Energy efficiency and resource management enhancements in Radio Access Networks⢠Definitions and models for the virtualised and cloud RAN architectures⢠Advances on feasible indoor localization and tracking techniques⢠Recent findings and innovations in antenna systems for communications⢠Physical Layer Network Coding for next generation wireless systems⢠Methods and techniques for MIMO Over the Air (OTA) testin
Cooperative Radio Communications for Green Smart Environments
The demand for mobile connectivity is continuously increasing, and by 2020 Mobile and Wireless Communications will serve not only very dense populations of mobile phones and nomadic computers, but also the expected multiplicity of devices and sensors located in machines, vehicles, health systems and city infrastructures. Future Mobile Networks are then faced with many new scenarios and use cases, which will load the networks with different data traffic patterns, in new or shared spectrum bands, creating new specific requirements. This book addresses both the techniques to model, analyse and optimise the radio links and transmission systems in such scenarios, together with the most advanced radio access, resource management and mobile networking technologies. This text summarises the work performed by more than 500 researchers from more than 120 institutions in Europe, America and Asia, from both academia and industries, within the framework of the COST IC1004 Action on "Cooperative Radio Communications for Green and Smart Environments". The book will have appeal to graduates and researchers in the Radio Communications area, and also to engineers working in the Wireless industry. Topics discussed in this book include: ⢠Radio waves propagation phenomena in diverse urban, indoor, vehicular and body environments⢠Measurements, characterization, and modelling of radio channels beyond 4G networks⢠Key issues in Vehicle (V2X) communication⢠Wireless Body Area Networks, including specific Radio Channel Models for WBANs⢠Energy efficiency and resource management enhancements in Radio Access Networks⢠Definitions and models for the virtualised and cloud RAN architectures⢠Advances on feasible indoor localization and tracking techniques⢠Recent findings and innovations in antenna systems for communications⢠Physical Layer Network Coding for next generation wireless systems⢠Methods and techniques for MIMO Over the Air (OTA) testin
Study, Measurements and Characterisation of a 5G system using a Mobile Network Operator Testbed
The goals for 5G are aggressive. It promises to deliver enhanced end-user experience
by offering new applications and services through gigabit speeds, and significantly
improved performance and reliability. The enhanced mobile broadband (eMBB) 5G use
case, for instance, targets peak data rates as high as 20 Gbps in the downlink (DL) and
10 Gbps in the uplink (UL).
While there are different ways to improve data rates, spectrum is at the core of enabling
higher mobile broadband data rates. 5G New Radio (NR) specifies new frequency
bands below 6 GHz and also extends into mmWave frequencies where more
contiguous bandwidth is available for sending lots of data. However, at mmWave
frequencies, signals are more susceptible to impairments. Hence, extra consideration is
needed to determine test approaches that provide the precision required to accurately
evaluate 5G components and devices.
Therefore, the aim of the thesis is to provide a deep dive into 5G technology, explore its
testing and validation, and thereafter present the OTE (Hellenic Telecommunications
Organisation) 5G testbed, including measurement results obtained and its characterisation based on key performance indicators (KPIs)
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