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Telecom
Special Issues
Theoretical Models and Simulations for New Mobile-Computing Architectures
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Theoretical Models and Simulations for New Mobile-Computing Architectures

A special issue of Telecom (ISSN 2673-4001).

Deadline for manuscript submissions: closed (31 July 2021) | Viewed by 13221

Special Issue Editors

Dr. Peppino Fazio

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Guest Editor
Department of Molecular Science and Nanosystems (DSMN), University Ca’ Foscari, Via Torino 155, Mestre, 30170 Venezia, Italy
Interests: vehicular communications; channel modeling; path prediction; Markov chains; satellite communications; resource allocation; call admission control; neural networks; wireless communications
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Floriano De Rango

E-Mail Website
Guest Editor
Department of Computer Engineering, Modelling, Electronics and Systems (DIMES), University of Calabria, 87036 Arcavacata of Rende, Cosenza, Italy
Interests: Internet of Things; advanced satellite networks for multimedia communications; wireless Ad Hoc networks; sensor networks; adaptive wireless systems; ultra wide band (UWB) technologies; channel modeling in wireless environment; security architectures and protocol over wireless networks; QoS services and architecture over distributed and centralized wireless systems
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Carlos Tavares Calafate

E-Mail Website
Guest Editor
Computer Engineering Department (DISCA), Universitat Politècnica de València (UPV), 46022 Valencia, Spain
Interests: UAV networking and communications solutions; drone swarms; UAS traffic management (UTM); IoT; Traffic management
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the last decade, a huge amount of research contributions have been proposed in the scientific community in the field of mobile communications, aimed especially at enhancing the quality of service or experience (QoS or QoE) perceived by mobile hosts. Mobile computing, especially in 5G, has been proven to offer many advantages (such as flexibility and robustness), but at the same time, different issues arise when QoS/QoE need to be guaranteed. It is well known, for example, that user mobility affects channel conditions (Doppler and fast/slow fading degradations, strictly related to the average speed) or blocking/dropping probability performance (when users move among different coverage areas in infrastructure networks, the available resources could be scarce). Traffic flowing may be also affected, with dynamic congestion levels and huge fluctuations in relevant QoS/QoE parameters, such as throughput, e2e-delay, jitter, packet-loss, etc. Similar problems arise also in distributed environments, where topology changes are frequent and routing protocols suffer high overheads for new path rearrangements.

This Special Issue is aimed at dealing with the issues above, providing a point of interest for the discussion and presentation of theoretical models, simulation approaches or a mixture of them, regarding the world of the mobile computing paradigm. The development of theoretical models regarding different OSI-layers has been showing relevant results in recent years, especially if predictive approaches are involved. This Special Issue is soliciting original quality and high-level technical papers addressing the main research challenges in QoE-aware mobile networking, via the introduction of new models and simulations based on emerging approaches, such as swarm intelligence, evolutionary genetics, neural networks, artificial intelligence, cellular automata, etc.

The interest of this Special Issue is focused on, but not limited to, the following areas of interest:

  • Mobility patterns analysis by synthetic or realistic models;
  • Innovative modelling techniques for communication systems, and their execution using optimized simulation algorithms;
  • Simulation of wireless channel dynamics in new generation networks;
  • Aerial drone object tracking through predictive models and simulations;
  • Complex systems and networks;
  • Congestion and admission control in wireless networks;
  • Mobility management and congestion avoidance in vehicular environments;
  • New tools and prediction techniques for measuring and monitoring mobile networks;
  • Development of new simulation engines for communication systems with mobile nodes;
  • Performance evaluation of mobile networks;
  • QoS/QoE and models for predictive routing;
  • Simulation of mobile network structures;
  • Traffic analysis in mobile networks and modeling of performance metrics;
  • Modelling of telecommunication systems by taking into account user mobility.

Dr. Peppino Fazio
Prof. Dr. Floriano De Rango
Prof. Dr. Carlos Tavares Calafate
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Telecom is an international peer-reviewed open access quarterly 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 1200 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.

Published Papers (3 papers)

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16 pages, 1536 KiB  
Article
A Survey on the Implementation and Management of Secure Virtual Private Networks (VPNs) and Virtual LANs (VLANs) in Static and Mobile Scenarios
by Antonio Francesco Gentile, Peppino Fazio and Giuseppe Miceli
Telecom 2021, 2(4), 430-445; https://doi.org/10.3390/telecom2040025 - 05 Nov 2021
Cited by 7 | Viewed by 5270
Abstract
Nowadays, the demand for connection between the remote offices of a company, or between research locations, and constantly increasing work mobility (partly due to the current pandemic emergency) have grown hand in hand with the quality and speed of broadband connections. The logical [...] Read more.
Nowadays, the demand for connection between the remote offices of a company, or between research locations, and constantly increasing work mobility (partly due to the current pandemic emergency) have grown hand in hand with the quality and speed of broadband connections. The logical consequence of this scenario is the increasingly widespread use of Virtual Private Network (VPN) connections. They allow one to securely connect the two ends of a connection via a dedicated network, typically using the Internet and reducing the costs of Content Delivery Network (CDN) lines (dedicated connections). At the same time, Virtual Local Area Networks (VLANs) are able to decrease the impact of some scalability issues of large networks. Given the background above, this paper is focused on overviewing and surveying the main progresses related to VPNs and VLANs in wireless networks, by collecting the most important contributions in this area and describing how they can be implemented. We state that security issues in VLANs can be effectively mitigated through the combination of good network-management practices, effective network design and the application of advanced security products. However, obviously, the implementation of VPNs and VLANs poses specific issues regarding information and network security; thus some good solutions are also surveyed. Full article
(This article belongs to the Special Issue Theoretical Models and Simulations for New Mobile-Computing Architectures)
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41 pages, 19746 KiB  
Article
Performance Evaluation of Radio Frequency Interference Measurements from Microwave Links in Dense Urban Cities
by Michael Adedosu Adelabu, Agbotiname Lucky Imoize and Glory Uzuazobona Ughegbe
Telecom 2021, 2(4), 328-368; https://doi.org/10.3390/telecom2040021 - 19 Oct 2021
Cited by 5 | Viewed by 3173
Abstract
Radio frequency interference (RFI) constitutes a significant problem in achieving a good quality of service in radio links. Several techniques have been proposed to identify and mitigate RFI in wireless networks. However, most of these techniques are not generalized for all propagation environments [...] Read more.
Radio frequency interference (RFI) constitutes a significant problem in achieving a good quality of service in radio links. Several techniques have been proposed to identify and mitigate RFI in wireless networks. However, most of these techniques are not generalized for all propagation environments due to varying geographical features from one environment to another. The need for extensive frequency scan measurements on the links to identify the available channels, evaluate the performances of the links, and detect RFI in the channels becomes imperative. This study presents a performance evaluation of frequency scan measurements from active microwave links comprising eighteen base stations. The measurements equipment included a spectrum analyzer and a 0.6 m antenna dish. The frequency scans were taken at 6 GHz, 7 GHz, and 8 GHz with full azimuth coverage of the horizontal and vertical polarization. Measured data were processed to determine the available frequencies and RFI in the channels. The histogram and probability density function of the frequency scans were computed. The cumulative distribution functions were determined, and the statistical error characteristics of the frequency scans for the estimated normal distribution and the estimated fitness curve were derived. The short-time Fourier transform of the noisy signal was obtained, and the signal without noise was recovered using the inverse short-time Fourier transform. Analysis of the scanned signals before and after the noise removal is demonstrated. The denoised signals compare favorably with related results in the preliminary literature. Overall, these frequency scans would be beneficial in evaluating RFI measurements and spectrum planning and hold great promise for designing robust RFI detection algorithms for future wireless systems. Full article
(This article belongs to the Special Issue Theoretical Models and Simulations for New Mobile-Computing Architectures)
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26 pages, 4873 KiB  
Article
Advanced Resources Reservation in Mobile Cellular Networks: Static vs. Dynamic Approaches under Vehicular Mobility Model
by Peppino Fazio and Mauro Tropea
Telecom 2021, 2(4), 302-327; https://doi.org/10.3390/telecom2040020 - 26 Sep 2021
Cited by 1 | Viewed by 3608
Abstract
Many studies in literature have shown that the bandwidth of an ongoing flow can dynamically change during multimedia sessions and an efficient bandwidth allocation scheme must be employed. This paper focuses its attention on the management of predictive services in Wireless Infrastructure Dynamic [...] Read more.
Many studies in literature have shown that the bandwidth of an ongoing flow can dynamically change during multimedia sessions and an efficient bandwidth allocation scheme must be employed. This paper focuses its attention on the management of predictive services in Wireless Infrastructure Dynamic Networks. In particular, two classes of service are considered: NSIS-Mobility Independent Predictive and NSIS-Mobility Dependent Predictive, where NSIS is the Next Steps in Signaling protocol, employed for resources reservation in Integrated Services architectures. A general prediction technique is proposed, based both on the analysis of time spent into a cell by mobile nodes and on the probabilities of hand-in and hand-out events of mobile nodes from wireless cells. User mobility needs to be firstly analyzed and a novel realistic mobility model has been considered, differently from some existing works in which synthetic mobility is generated. The analysis of user mobility is mandatory when the reduction of passive resource reservations for NSIS-MIP users is desired, with a good enhancement in system utilization. Moreover, predictive reservation and admission control schemes have been integrated. The performance of the 2D wireless system is evaluated in terms of average system utilization, system outage probability, number of admitted flows and reservation prediction errors. We provided to carry out an extensive simulation campaign, in order to assess the goodness of the proposed idea: we verified that good results (in terms of perceived utility, bandwidth and admitted flows) can be obtained, outperforming also some existing works. Full article
(This article belongs to the Special Issue Theoretical Models and Simulations for New Mobile-Computing Architectures)
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