112 research outputs found
SDN/NFV-enabled satellite communications networks: opportunities, scenarios and challenges
In the context of next generation 5G networks, the satellite industry is clearly committed to revisit and revamp the role of satellite communications. As major drivers in the evolution of (terrestrial) fixed and mobile networks, Software Defined Networking (SDN) and Network Function Virtualisation (NFV) technologies are also being positioned as central technology enablers towards improved and more flexible integration of satellite and terrestrial segments, providing satellite network further service innovation and business agility by advanced network resources management techniques. Through the analysis of scenarios and use cases, this paper provides a description of the benefits that SDN/NFV technologies can bring into satellite communications towards 5G. Three scenarios are presented and analysed to delineate different potential improvement areas pursued through the introduction of SDN/NFV technologies in the satellite ground segment domain. Within each scenario, a number of use cases are developed to gain further insight into specific capabilities and to identify the technical challenges stemming from them.Peer ReviewedPostprint (author's final draft
Network emulation focusing on QoS-Oriented satellite communication
This chapter proposes network emulation basics and a complete case study of QoS-oriented Satellite Communication
Latency-aware End-to-end Multi-path Data Transmission for URLLC Services
5th Generation Mobile Communication Technology (5G) utilizes the Access
Traffic Steering, Switching, and Splitting (ATSSS) rule to enable multi-path
data transmission, which is currently being standardized. Recently, the 3rd
Generation Partnership Project (3GPP) SA1 and SA2 have been working on the
multi-path solution for possible improvement from different perspectives.
However, the existing 3GPP multi-path solution has some limitations on
ultra-reliable low-latency communication (URLLC) traffic in terms of
reliability and latency requirements. In order to capture the potential gains
of multi-path architecture in the context of URLLC services, this paper
proposes a novel traffic splitting technique that can more efficiently enjoy
the benefit of multi-path architecture in reducing user equipment (UE) uplink
(UL) end-to-end (E2E) latency. In particular, we formulate an optimization
framework that minimizes user's UL E2E latency via the joint optimization on
the ratio of traffic assigned to each path and their corresponding transmit
power. The performance of the proposed scheme is evaluated via well-designed
simulations.Comment: This work has been submitted to the IEEE for possible publication. 5
pages, 6 figure
Mobile and Wireless Communications
Mobile and Wireless Communications have been one of the major revolutions of the late twentieth century. We are witnessing a very fast growth in these technologies where mobile and wireless communications have become so ubiquitous in our society and indispensable for our daily lives. The relentless demand for higher data rates with better quality of services to comply with state-of-the art applications has revolutionized the wireless communication field and led to the emergence of new technologies such as Bluetooth, WiFi, Wimax, Ultra wideband, OFDMA. Moreover, the market tendency confirms that this revolution is not ready to stop in the foreseen future. Mobile and wireless communications applications cover diverse areas including entertainment, industrialist, biomedical, medicine, safety and security, and others, which definitely are improving our daily life. Wireless communication network is a multidisciplinary field addressing different aspects raging from theoretical analysis, system architecture design, and hardware and software implementations. While different new applications are requiring higher data rates and better quality of service and prolonging the mobile battery life, new development and advanced research studies and systems and circuits designs are necessary to keep pace with the market requirements. This book covers the most advanced research and development topics in mobile and wireless communication networks. It is divided into two parts with a total of thirty-four stand-alone chapters covering various areas of wireless communications of special topics including: physical layer and network layer, access methods and scheduling, techniques and technologies, antenna and amplifier design, integrated circuit design, applications and systems. These chapters present advanced novel and cutting-edge results and development related to wireless communication offering the readers the opportunity to enrich their knowledge in specific topics as well as to explore the whole field of rapidly emerging mobile and wireless networks. We hope that this book will be useful for students, researchers and practitioners in their research studies
Design and analysis of multi-element antenna systems and agile radiofrequency frontends for automotive applications
Vehicular connectivity serves as one of the major enabling technologies for
current applications like driver assistance, safety and infotainment as well as
upcoming features like highly automated vehicles - all of which having certain
quality of service requirements, e. g. datarate or reliability. This work focuses on
vehicular integration of multiple-input-multiple-output (MIMO) capable multielement
antenna systems and frequency-agile radio frequency (RF) front ends
to cover current and upcoming connectivity needs. It is divided in four major
parts. For each part, mostly physical layer effects are analyzed (any performance
lost on physical layer, cannot be compensated in higher layers), sensitivities are
identified and novel concepts are introduced based on the status-quo findings.Fahrzeugvernetzung dient als eine der wesentlichsten Befähigungstechnologien
für moderne Fahrerassistenzsysteme und zukünftig auch hochautomatisiertes
Fahren. Sowohl die heutigen als auch zukünftige Anwendungen haben besondere
Dienstgüteanforderungen, z.B. in Bezug auf die Datenrate oder Verlässlichkeit.
Im Rahmen dieser Arbeit wird die Integration von Mehrantennensystemen für
MIMO-Funkanwendungen (MIMO: engl. Multiple Input Multiple Output) sowie
von frequenzagilen Hochfrequenzfrontends im Fahrzeugumfeld untersucht, um
so eine technische Grundlage für zukünftige Anforderungen an die automobile
Vernetzung anbieten zu können. Die dabei gewonnenen Erkenntnisse lassen sich
in vier Teile gliedern. Grundsätzlich konzentrieren sich die Untersuchungen vorrangig
auf die physikalische Ebene. Auf Basis des aktuellen Status Quo werden
Sensitivitäten herausgearbeitet, neue Konzepte hergeleitet und entwickelt
Modelling, Dimensioning and Optimization of 5G Communication Networks, Resources and Services
This reprint aims to collect state-of-the-art research contributions that address challenges in the emerging 5G networks design, dimensioning and optimization. Designing, dimensioning and optimization of communication networks resources and services have been an inseparable part of telecom network development. The latter must convey a large volume of traffic, providing service to traffic streams with highly differentiated requirements in terms of bit-rate and service time, required quality of service and quality of experience parameters. Such a communication infrastructure presents many important challenges, such as the study of necessary multi-layer cooperation, new protocols, performance evaluation of different network parts, low layer network design, network management and security issues, and new technologies in general, which will be discussed in this book
Quantifying Potential Energy Efficiency Gain in Green Cellular Wireless Networks
Conventional cellular wireless networks were designed with the purpose of
providing high throughput for the user and high capacity for the service
provider, without any provisions of energy efficiency. As a result, these
networks have an enormous Carbon footprint. In this paper, we describe the
sources of the inefficiencies in such networks. First we present results of the
studies on how much Carbon footprint such networks generate. We also discuss
how much more mobile traffic is expected to increase so that this Carbon
footprint will even increase tremendously more. We then discuss specific
sources of inefficiency and potential sources of improvement at the physical
layer as well as at higher layers of the communication protocol hierarchy. In
particular, considering that most of the energy inefficiency in cellular
wireless networks is at the base stations, we discuss multi-tier networks and
point to the potential of exploiting mobility patterns in order to use base
station energy judiciously. We then investigate potential methods to reduce
this inefficiency and quantify their individual contributions. By a
consideration of the combination of all potential gains, we conclude that an
improvement in energy consumption in cellular wireless networks by two orders
of magnitude, or even more, is possible.Comment: arXiv admin note: text overlap with arXiv:1210.843
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