Almudena Diaz Zayas

Dr. Almudena Diaz Zayas

Universidad de Málaga
orcid

Research Focus & Metrics

Academic Career Length

21Years (2006-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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21 August 2009 in IEEE Pervasive Computing
Verified
Journal Article
Closed access
Almudena Diaz ZayasAlmudena Diaz Zayas
Almudena Diaz Zayas
PMPedro Merino-Gómez
Pedro Merino-Gómez
FTFrancisco Rivas Tocado
Francisco Rivas Tocado
The SymPA (Symbian protocol analyzer) tool correlates traffic information, radio-access-technology measurements, and location data to help developers evaluate mobile applications in the field.

1 April 2016
Verified
Conference Paper
Closed access
Almudena Diaz ZayasAlmudena Diaz Zayas
Almudena Diaz Zayas
CGCesar A. Garcia-Perez
Cesar A. Garcia-Perez
ARAlvaro M. Recio-Perez
Alvaro M. Recio-Perez
PMPedro Merino
Pedro Merino
Nowadays, the maturity of IoT applications, networking technologies and manufacturers of "things" have caused an explosion in the number of connected devices. There are several reports which calculate that the number of connected things will reach 50 billion in the near future. This paper focuses on the provision of wide area and efficient connectivity to the Internet of Things(IoT), a key factor in such an explosion, through the usage of LTE. LTE MTC (Machine Type Communication), LTE M2M or just LTE-M are the coined terms that refer to this issue. This paper provides a detailed analysis of the standardization efforts carried out by the 3GPP to convert LTE into an IoT capable technology.

20 November 2020 in Sensors
Verified
Journal Article
Open access
PDF file
Almudena Diaz ZayasAlmudena Diaz Zayas
Almudena Diaz Zayas
Giuseppe CasoGiuseppe Caso
Giuseppe Caso
Özgü AlayÖzgü Alay
Özgü Alay
PMPedro Merino-Gómez
Pedro Merino-Gómez
Anna BrunstromAnna Brunstrom
Anna Brunstrom
Harilaos KoumarasHarilaos Koumaras
Harilaos Koumaras
The high heterogeneity of 5G use cases requires the extension of the traditional per-component testing procedures provided by certification organizations, in order to devise and incorporate methodologies that cover the testing requirements from vertical applications and services. In this paper, we introduce an experimentation methodology that is defined in the context of the 5GENESIS project, which aims at enabling both the testing of network components and validation of E2E KPIs. The most important contributions of this methodology are its modularity and flexibility, as well as the open-source software that was developed for its application, which enable lightweight adoption of the methodology in any 5G testbed. We also demonstrate how the methodology can be used, by executing and analyzing different experiments in a 5G Non-Standalone (NSA) deployment at the University of Malaga. The key findings of the paper are an initial 5G performance assessment and KPI analysis and the detection of under-performance issues at the application level. Those findings highlight the need for reliable testing and validation procedures towards a fair benchmarking of generic 5G services and applications.

2 May 2014 in IEEE Vehicular Technology Magazine
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Journal Article
Closed access
Almudena Diaz ZayasAlmudena Diaz Zayas
Almudena Diaz Zayas
CPCesar A. Garcia Perez
Cesar A. Garcia Perez
PGPedro Merino Gomez
Pedro Merino Gomez
The Global System for Mobile Communications-Railways (GSM-R) is a radio telecommunication network and the bearer technology for the European Train Control System (ETCS). Both GSM-R and ETCS constitute the European Rail Traffic Management System (ERTMS). GSM was adopted by the International Union of Railways (UIC) because it was the only system in commercial operation with a great potential to fulfill the requirements for the transport of railway services, although some features had to be added to the standard. However, as time has passed, GSM-R has proven to have capacity limitations, higher costs, and long development cycle times due to the special features built into standard GSM that have reduced the market for GSM-R equipment. These facts, together with the end of industry support by 2025, are motivating the switch to long-term evolution (LTE)/system architecture evolution technology as the new bearer network for railways. LTE provides higher data capacity than GSM and presents a flat architecture, which reduces deployment and maintenance costs as long as standard elements are used. This article provides an overview of third-generation partnership project (3GPP) systems, services, and their standardization status, which should be implemented to support the transport of railway services over a standard LTE network. Additionally, the quality of service (QoS) requirements for the transport of ETCS data control are compared with the QoS provided by LTE.

7 November 2020 in Applied Sciences
Verified
Journal Article
Open access
PDF file
Almudena Diaz ZayasAlmudena Diaz Zayas
Almudena Diaz Zayas
FTFrancisco Javier Rivas Tocado
Francisco Javier Rivas Tocado
PPPILAR RODRIGUEZ PINOS
PILAR RODRIGUEZ PINOS
NB-IoT is the first 3GPP technology that has been specifically developed for IoT. In this paper, we will introduce the most important NB-IoT features included in Release 14, Release 15, and Release 16 and the need for testing of NB-IoT solutions. This paper is focused on demonstrating the potential of the new experimentation features included into the TRIANGLE testbed to support testing and benchmarking of Narrowband Internet of Thing (NB-IoT) solutions. TRIANGLE provides an experimentation framework that offers a high level of abstraction using a framework that allows for defining and executing experiments in a very straightforward way. The experimentation framework developed as part of the TRIANGLE project optionally keeps experimenters far from the low level configuration of the infrastructure and provides scenarios which reproduce realistic conditions.

1 September 2017 in Pervasive and Mobile Computing
Verified
Journal Article
Open access
CGCesar Garcia-Perez
Cesar Garcia-Perez
Almudena Diaz ZayasAlmudena Diaz Zayas
Almudena Diaz Zayas
ARAlvaro Rios
Alvaro Rios
PMPedro Merino
Pedro Merino
KKKostas Katsalis
Kostas Katsalis
DMDonal Morris
Donal Morris