Special Issue "Optical Communications and Networking Solutions for the Support of C-RAN in 5G Environments"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: 15 October 2018

Special Issue Editors

Guest Editor
Prof. Dr. Vincenzo Eramo

Department of Engineering of Information, Electronics and Telecommunications, University of Rome “La Sapienza”, Rome 00184, Italy
Website | E-Mail
Interests: telecommunication networks; all-optical networks; internet switching architectures; network function virtualization
Guest Editor
Prof. Dr. Marco Listanti

Department of Engineering of Information, Electronics and Telecommunications, University of Rome “La Sapienza”, Rome 00184, Italy
Website | E-Mail
Interests: telecommunication networks; all-optical networks; internet switching architectures; green networking
Guest Editor
Dr. Francesco Giacinto Lavacca

Department of Engineering of Information, Electronics and Telecommunications, University of Rome “La Sapienza”, Rome 00184, Italy
Website | E-Mail
Interests: optical networking; network function virtualization

Special Issue Information

Dear Colleagues,

The widespread availability of mobile devices, such as tablets and smartphones, has led to a quick increase in mobile data traffic over the last few years. Furthermore, based on different studies and predictions, it is possible to conclude that, beyond 2020, mobile networks will be asked to support more than 1000 times today's traffic volumes. Demands for higher mobile networks capacity, increased data rates and for a larger number of simultaneously-connected devices are just few of the requirements posed in the evolution of radio access networks. Other fundamental factors are energy saving and cost of systems, latency, spectrum availability and spectral efficiency. Naturally, one of the solutions to deal with the very high capacity and coverage demand is the strong radio site densification (e.g. through small, pico, femto cells), that could be also obtained by different deployment architectures. Cloud Radio Access Network (C-RAN) or centralized RAN can be seen as a promising solution to deal the 5G requirements. Traditional C-RANs are organized as a three-element network: a distributed unit (DU), a central unit (CU) and a fronthaul network interconnecting CUs and DUs. The CU provides baseband signal processing functions and the DU provides the radio frequency (RF) signal transmission and reception functions. The C-RAN architecture enables Base Stations to be deployed flexibly and cost-effectively, and is capable of performance enhancement through the use of coordinated multi-point transmission and reception (CoMP). The in-phase and quadrature (IQ) samples of the baseband signals are transmitted in the fronthaul network across a common public radio interface (CPRI).

We invite investigators to submit original research articles in which solutions for the bandwidth saving in fronthaul networks are proposed and evaluated especially for the support of 5G traffic and system requirements. Potential topics include, but are not limited to:

  • Compression techniques for the reduction in bit-rate of the CPRI flows;
  • Functional split between DU and CU;
  • 5G fronthaul network architectures based on technologies such as Ethernet, OTN, etc..;
  • QoS support in the frontaul network;
  • Optical modulation systems for the fronthaul network;
  • Techniques for the virtualization of the functionalities in the CU.

Prof. Dr. Vincenzo Eramo
Prof. Dr. Marco Listanti
Dr. Francesco Giacinto Lavacca
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Radio access network
  • 5G environment
  • CPRI
  • Virtualization
  • Ethernet
  • OTN
  • WDM

Published Papers (2 papers)

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Research

Open AccessArticle Traffic-Estimation-Based Low-Latency XGS-PON Mobile Front-Haul for Small-Cell C-RAN Based on an Adaptive Learning Neural Network
Appl. Sci. 2018, 8(7), 1097; https://doi.org/10.3390/app8071097
Received: 6 May 2018 / Revised: 28 June 2018 / Accepted: 28 June 2018 / Published: 6 July 2018
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Abstract
In this paper, we propose a novel method for low-latency 10-Gigabit-capable symmetric passive optical network (XGS-PON) mobile front-haul for small cell cloud radio access network (C-RAN) based on traffic estimation. In this method, the number of packets that arrive to the optical network
[...] Read more.
In this paper, we propose a novel method for low-latency 10-Gigabit-capable symmetric passive optical network (XGS-PON) mobile front-haul for small cell cloud radio access network (C-RAN) based on traffic estimation. In this method, the number of packets that arrive to the optical network unit (ONU) buffer from the remote radio unit (RRU) link is predicted using an adaptive learning neural network function integrated into the dynamic bandwidth allocation (DBA) module at the optical line terminal (OLT). By using this predictive method, we are able to eliminate the additional DBA processing delay and the delay required for reporting ONU buffer occupancy to the OLT. As a result, the latency is as low as required for mobile front-haul in C-RAN architecture. The performance of the new method is evaluated by means of simulation under XGS-PON standard. The simulation results confirmed the capability of the proposed method of achieving the latency requirement for mobile front-haul while outperforming some other XGS-PON standard compliant algorithms that are optimized to support mobile front-haul and backhaul traffic. Full article
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Open AccessFeature PaperArticle Dimensioning Models of Optical WDM Rings in Xhaul Access Architectures for the Transport of Ethernet/CPRI Traffic
Appl. Sci. 2018, 8(4), 612; https://doi.org/10.3390/app8040612
Received: 23 March 2018 / Revised: 6 April 2018 / Accepted: 6 April 2018 / Published: 12 April 2018
Cited by 2 | PDF Full-text (873 KB) | HTML Full-text | XML Full-text
Abstract
The Centralized Radio Access Network (C-RAN) provides a valid solution to overcome the problem of traditional RAN in scaling up to the needed processing resource and quality expected in 5G. The Common Public Rate Interface has been defined to transport traffic flows in
[...] Read more.
The Centralized Radio Access Network (C-RAN) provides a valid solution to overcome the problem of traditional RAN in scaling up to the needed processing resource and quality expected in 5G. The Common Public Rate Interface has been defined to transport traffic flows in C-RAN and recently some market solutions are available. Its disadvantage is to increase by at least 10 times the needed bandwidth and for this reason its introduction will be gradual and will coexist with traditional RAN solutions in which Ethernet traffic is carried towards the radio base stations. In this paper, we propose an Xhaul optical network architecture based on Optical Transport Network (OTN) and Dense Wavelength Division Multiplexing (DWDM) technologies. The network allows for a dynamic allocation of the bandwidth resources according to the current traffic demand. The network topology is composed of OTN/DWDM rings and the objective of the paper is to evaluate the best configuration (number of rings and number of wavelengths needed) to both to minimize the cost and to provide an implementable solution. We introduce an analytical model for the evaluation of the number of wavelengths needed in each optical ring and provide some results for 5G case studies. We show how, although the single ring configuration provides the least cost solution due to the high statistical multiplexing advantage, it is not implementable because it needs switching apparatus with a too high number of ports. For this reason, more than one ring is needed and its value depends on several parameters as the offered traffic, the number of Radio Remote Units (RRU), the percentage of business sub-area and so on. Finally, the analytical model allows us to evaluate the advantages of the proposed dynamic resource allocation solution with respect to the static one in which the network is provided with a number of wavelengths determined in the scenario in which the radio station works at full load. The bandwidth saving can be in the order of 90% in a 5G traffic scenario. Full article
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Figure 1

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