N. Merayo

N. Merayo
Universidad de Valladolid | UVA · Department of Theory of Signal and Communications and Telematic Engineering

Telecomm engineer

About

138
Publications
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847
Citations

Publications

Publications (138)
Conference Paper
Los nuevos servicios y aplicaciones disruptivas requieren la utilización de redes de comunicaciones de banda ancha. En el segmento de acceso, las redes de acceso ópticas pasivas (PON) se están consolidando como la mejor alternativa para este despliegue dado que las tecnologías de acceso tradicionales (cable coaxial, cobre) ya han dejado de ser capa...
Article
Full-text available
Engineering profiles focused on next‐generation optical networks are gaining immense importance due to new emerging services and the amount of data expected in future network scenarios. In fact, not only are optical access networks leading to a major revolution in the network industry, but passive optical networks are the most widely deployed acces...
Article
Full-text available
We propose, and experimentally demonstrate, an SDN (Software Defined Networking) new management solution for legacy GPONs (Gigabit Passive Optical Networks), which allows users to dynamically control their residential networks by means of a management application. In this way, users can customize the allocation of resources (and set constraints, if...
Chapter
Future metro networks will connect many multiaccess edge computing resources (MEC) working in a coordinating fashion to provide users with cloud computing capabilities with very low latency. That highly distributed computing architecture has to be connected by a network that provides high bandwidth and flexibility. Elastic optical networks (EONs) a...
Article
Full-text available
The integration of Software Defined Networking (SDN) technologies in Passive Optical Networks (PONs) would provide great advantages to Internet Service Providers (ISPs) and Network Operators, since they can optimize the network operation and reduce its complexity. However, some tasks regarding online service and network configuration strategies are...
Chapter
A very significant decline in technological and scientific vocations is being experienced in Europe, especially regarding the female sector. In this context, the InGenias Project was born, with the aim of making female university students and teachers protagonists of future technological vocations. They promote these vocations among secondary stude...
Article
Full-text available
Elastic Optical Networks (EONs) are a promising optical technology to deal with the ever-increasing traffic and the vast number of connected devices of the next generation of the Internet, associated to paradigms like the Internet of Things (IoT), the Tactile Internet or the Industry 4.0, to name just a few. In this kind of optical network, each op...
Article
Full-text available
Next generation of Internet of Things (IoT) services imposes stringent requirements to the future networks that current ones cannot fulfill. 5G is a technology born to give response to those requirements. However, the deployment of 5G is also accompanied by profound architectural changes in the network, including the introduction of technologies li...
Article
Full-text available
Residential networks play a critical role in assuring that services or applications such as tele-work, tele-education, medical care, entertainment, home automation, among others, have the required resources to obtain an optimal performance. Although current residential gateways try to meet the Quality of Service (QoS) demands, the traditional netwo...
Chapter
Network Function Virtualization (NFV) is considered to be one of the enabling technologies for 5G. NFV poses several challenges, like deciding the virtual network function (VNF) placement and chaining, and adding backup resources to guarantee the survivability of service chains. In this paper, we propose a genetic algorithm that jointly solves the...
Article
Full-text available
Dynamic bandwidth and wavelength allocation are used to demonstrate high quality of service (QoS) in time wavelength-division multiplexed–passive optical networks (TWDM-PONs). Both bandwidth and wavelength assignment are performed on the basis of transmission containers (T-CONTs) and therefore by means of upstream service priority traffic flows. Ou...
Article
Full-text available
5G technologies promise to bring new network and service capacities and are expected to introduce significant architectural and service deployment transformations. The Cloud-Radio Access Networks (C-RAN) architecture, enabled by the combination of Software Defined Networking (SDN), Network Function Virtualization (NFV) and Mobile Edge Computing (ME...
Poster
Full-text available
A real end-to-end SDN based GPON scenario to provide a fast, efficient and accurate QoS management is proposed. It is designed to support a novel network management model that permits residential users to control their bandwidth network resources
Conference Paper
Full-text available
This paper overviews the approach of the Elastic Networks research network to address different issues of planning and control of Flex-Grid/SDM optical networks. Firstly, we present the Net2Plan open-source planning tool capabilities to model Flex-Grid/SDM networks; secondly a PCE-based Transport-SDN controller for packet over flex-grid optical net...
Conference Paper
Full-text available
A genetic algorithm is proposed to map virtual network functions in computing resources over 5G networks with an optical backhauling system. The algorithm outperforms other proposals in terms of blocking ratio and active CPU cores utilization.
Article
We developed the responsive environment AIM‐Mobile Learning Platform, which permits to assess students using smartphones and to design online educational packets. We carried out a qualitative and quantitative study in Higher Education subjects using the case study and the triangulation data methods. Results demonstrated that the environment promote...
Article
Full-text available
Artificial intelligence (AI) is an extensive scientific discipline which enables computer systems to solve problems by emulating complex biological processes such as learning, reasoning and self-correction. This paper presents a comprehensive review of the application of AI techniques for improving performance of optical communication systems and n...
Conference Paper
The combination of Learning Management Systems (LMS) with smartphones is gaining importance in Higher Education studies. Therefore, we have designed a responsive virtual environment, AIM-Mobile Learning Platform, focus on integrating smartphones in class. It permits teachers to send real time questions and learning packets with multimedia resources...
Conference Paper
The promises of SDN and NFV technologies to boost innovation and to reduce the time-to-market of new services is changing the way in which residential networks will be deployed, managed and maintained in the near future. New user-centric management models for residential networks combining SDN-based residential gateways and cloud technologies have...
Article
Full-text available
In this paper, a proportional-integral-derivative (PID) controller integrated with a neural network (NN) is proposed to ensure quality of service (QoS) bandwidth requirements in passive optical networks (PONs). To the best of our knowledge, this is the first time an approach that implements aNNto tune a PID to dealwithQoS in PONs is used. In contra...
Article
Network utility maximization (NUM) models have been successfully applied to address multiple resource- allocation problems in communication networks. This paper explores, for the first time to our knowledge, their application to modeling the bandwidth-allocation problem in passive optical networks (PONs) and long-reach PONs. Using the NUM model, we...
Article
Passive Optical Networks (PONs) are the most important access architectures since their deployment is massive all around the world. However, the QoS (Quality of Service) and the efficient management of the network resources have become the key point, especially with the new emerging services and applications. In particular, the delay and the bandwi...
Article
We review a number of dynamic traffic grooming algorithms proposed by Zhang et al. for elastic optical networks and extend their study. We first extend their work to analyse the impact of using different modulation formats (either used individually or jointly), as well as to evaluate the performance of the methods when facing physical layer impairm...
Article
In this paper we propose a novel tuning technique for PID controllers with the aim to efficiently control network resources and parameters in Passive Optical Networks (PONs). Contrary to other tuning existing methods applied to these networks (Ziegler-Nichols (ZN), genetic algorithms (GA)), our proposal, based on neural networks, makes a real time...
Article
In this paper, we propose to enhance and speed-up the teaching-learning process in optical communication subjects by designing and implementing new e-learning and m-learning strategies and applications. The new educational scenario demands a methodological renewal focused on the learning process and the acquisition of skills. In this way, telematic...
Article
Full-text available
In this article, we propose the design and implementation of m-learning strategies to enhance the quality of the teaching-learning process in engineering degrees. In the new Higher Education framework students become the main characters, as well as their learning capacity and their autonomy to acquire the required skills. The integration of technol...
Article
In this paper a novel algorithm with delay guarantees for high priority traffic based on a Proportional (P) controller for Long-Reach Passive Optical Networks (LR-PONs) is proposed. We have recently demonstrated that Proportional-Integral-Derivative (PID) controllers are quite effective when controlling guaranteed bandwidth levels and in this paper...
Conference Paper
An emulation study has been carried to demonstrate the benefit of a proactive restoration technique in cognitive heterogeneous optical networks. Results show the advantages of that method in terms of recovery percentage and disruption time.
Conference Paper
Optical networks are facing increased levels of heterogeneity, from types of services to the range of technologies involved. In this paper, we focus on the inter-domain heterogeneity scenario and consider the case of a set of interconnected network domains, each one using its own optical networking technology (wavelength-routing, optical burst-swit...
Conference Paper
A set of techniques to design the virtual topology for flexible optical networks is presented. They are based on previous algorithms proposed for fixed-grid optical networks, which are adapted and optimized to the characteristics of flexible networks. A simulation study is presented to evaluate their performance. The technique that obtains the best...
Conference Paper
In this paper, a new reconfiguration policy and a new algorithm for the virtual topology design, named CONGA-VTD (Cost-OptimizatioN Genetic Algorithm for Virtual Topology Design) for Wavelength-Routed Optical Networks are proposed. The objectives of both proposals are to minimize the Packet Loss Ratio (PLR) and the OPerational EXpenditures (OPEX)....
Conference Paper
Full-text available
We demonstrate that the introduction of cognitive techniques in virtual topology design leads to significant savings in terms of the total cost of ownership compared to conventional methods. Case study results indicate that capital and operational expenditures can be respectively reduced by up to 20% and 25% via a genetic algorithm-based method.
Conference Paper
Despite what the name may suggest, Wavelength-Routed Optical Burst-Switched networks (WR-OBS) are in fact highly dynamic optical circuit-switched networks, where requests for lightpath establishment are triggered by the arrival of data at the edge routers. While a WR-OBS, like any other wavelength-routed network, can benefit from the Path Computati...
Chapter
This chapter presents a comprehensive overview of current deployed and novel proposed protocols and subsystem architectures for passive optical networks. Emphasis is given to link layer techniques that allow resource sharing emphasizing bandwidth utilization or so-called dynamic bandwidth allocation techniques. In the transport layer, methods for O...
Conference Paper
In this paper, we present a new version of a multiobjective genetic algorithm to design virtual topologies with the aim of reducing both the energy consumption and the network congestion. Moreover, we also propose an improved version of that algorithm, by including two cognitive techniques. Unlike the original version, the new proposals design surv...
Article
It this paper it is presented the development of an Ethernet Passive Optical Network (EPON) simulator implemented in the simulation platform OMNeT++. The EPON simulator has been designed to provide high flexibility, scalability, and generality. Its architecture is based on a typical tree topology which implements several Medium Access Control (MAC)...
Article
A novel bandwidth assignment algorithm in Ethernet Passive Optical Networks with different coverage, called DySGAB, is proposed to provide subscriber differentiation. In contrast to algorithms which allocate bandwidth based on fixed weighted factors, DySGAB continuously adapts the bandwidth assignation to fulfill the requirements of all profiles, l...
Conference Paper
Future optical networks may increase their efficiency and flexibility by the utilization of Orthogonal Frequency Division Multiplexing (OFDM). When such a technique is employed, the spectrum assigned to a lightpath can be tailored to suit its requirements. Thus, when addressing the establishment of optical connections (lightpaths) in flexible optic...
Conference Paper
A new bandwidth allocation algorithm for LR-EPONs based on a PID controller tuned with Genetic Algorithms is proposed to efficiently fulfill the subscribers’ bandwidth requirements.
Conference Paper
We study the effect of TCP synchronization on Optical Burst Switched (OBS) networks and its impact on capacity dimensioning. The synchronization of TCP flows appears when a burst with segments from different TCP flows is discarded, making that all TCP flows reduce their transmission rate at the same time, leading to inefficient bandwidth sharing. T...