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Computers
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Selected Papers from 16th&17th Wireless and Mobile Computing, Networking And...
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Selected Papers from 16th&17th Wireless and Mobile Computing, Networking And Communications (WiMob 2020&2021)

A special issue of Computers (ISSN 2073-431X). This special issue belongs to the section "Cloud Continuum and Enabled Applications".

Deadline for manuscript submissions: closed (15 April 2021) | Viewed by 12939

Special Issue Editors

Dr. Anna Maria Vegni

E-Mail Website
Guest Editor
Department of Engineering, Università di RomaTre, 00146 Rome, Italy
Interests: wireless and vehicular communications; nanocommunications; optical wireless communications
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Marc Kurz

E-Mail Website
Guest Editor
Department of Mobility and Energy, University of Applied Sciences Upper Austria, 4232 Hagenberg, Austria
Interests: mobile software systems; frameworks and architectures; activity and context recognition; Internet of Things; distributed and autonomic computing; adaptive and self-adaptive systems
Special Issues, Collections and Topics in MDPI journals
Dr. Chunxiao Jiang

E-Mail Website
Guest Editor
1. Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing 100084, China
2. Tsinghua Space Center, Tsinghua University, Beijing 100084, China
Interests: statistical theories to communication; networking; resource allocation problems; space networks; heterogeneous networks
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The 16th International Conference on Wireless and Mobile Computing, Networking, and Communications will be held in Thessaloniki, Greece, October 12–14, 2020. The WiMob conference is an international forum for the exchange of experience and knowledge among researchers and developers concerned with wireless and mobile technology. For thirteen years, the International WiMob conference has provided unique opportunities for researchers to interact, share new results, show live demonstrations, and discuss emerging directions in wireless communication, wireless networking, mobility and nomadicity, ubiquitous computing, services and applications, green and sustainable communications and network computing, and security of wireless and mobile networks. For more information about the conference, please use the following link: https://www.wimob.org/wimob2020.

Selected papers that were presented at the workshop are invited to submit their extended versions to this Special Issue of the journal Computers after the conference. Submitted papers should be extended to the size of regular research or review articles, with at least a 50% extension of new results. All submitted papers will undergo our standard peer-review procedure. Accepted papers will be published in open-access format in Computers and collected together in this Special Issue website. There are no page limitations for this journal.

Dr. Anna Maria Vegni
Prof. Dr. Marc Kurz
Dr. Chunxiao Jiang
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. Computers 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 1800 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 (5 papers)

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Research

28 pages, 762 KiB  
Article
A Centralized Routing for Lifetime and Energy Optimization in WSNs Using Genetic Algorithm and Least-Square Policy Iteration
by Elvis Obi, Zoubir Mammeri and Okechukwu E. Ochia
Computers 2023, 12(2), 22; https://0-doi-org.brum.beds.ac.uk/10.3390/computers12020022 - 18 Jan 2023
Cited by 1 | Viewed by 1279
Abstract
Q-learning has been primarily used as one of the reinforcement learning (RL) techniques to find the optimal routing path in wireless sensor networks (WSNs). However, for the centralized RL-based routing protocols with a large state space and action space, the baseline Q-learning used [...] Read more.
Q-learning has been primarily used as one of the reinforcement learning (RL) techniques to find the optimal routing path in wireless sensor networks (WSNs). However, for the centralized RL-based routing protocols with a large state space and action space, the baseline Q-learning used to implement these protocols suffers from degradation in the convergence speed, network lifetime, and network energy consumption due to the large number of learning episodes required to learn the optimal routing path. To overcome these limitations, an efficient model-free RL-based technique called Least-Square Policy Iteration (LSPI) is proposed to optimize the network lifetime and energy consumption in WSNs. The resulting designed protocol is a Centralized Routing Protocol for Lifetime and Energy Optimization with a Genetic Algorithm (GA) and LSPI (CRPLEOGALSPI). Simulation results show that the CRPLEOGALSPI has improved performance in network lifetime and energy consumption compared to an existing Centralized Routing Protocol for Lifetime Optimization with GA and Q-learning (CRPLOGARL). This is because the CRPLEOGALSPI chooses a routing path in a given state considering all the possible routing paths, and it is not sensitive to the learning rate. Moreover, while the CRPLOGARL evaluates the optimal policy from the Q-values, the CRPLEOGALSPI updates the Q-values based on the most updated information regarding the network dynamics using weighted functions. Full article
(This article belongs to the Special Issue Selected Papers from 16th&17th Wireless and Mobile Computing, Networking And Communications (WiMob 2020&2021))
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22 pages, 26301 KiB  
Article
A Novel Simulation Platform for Underwater Data Muling Communications Using Autonomous Underwater Vehicles
by Filipe B. Teixeira, Bruno M. Ferreira, Nuno Moreira, Nuno Abreu, Murillo Villa, João P. Loureiro, Nuno A. Cruz, José C. Alves, Manuel Ricardo and Rui Campos
Computers 2021, 10(10), 119; https://0-doi-org.brum.beds.ac.uk/10.3390/computers10100119 - 22 Sep 2021
Cited by 4 | Viewed by 2752
Abstract
Autonomous Underwater Vehicles (AUVs) are seen as a safe and cost-effective platforms for performing a myriad of underwater missions. These vehicles are equipped with multiple sensors which, combined with their long endurance, can produce large amounts of data, especially when used for video [...] Read more.
Autonomous Underwater Vehicles (AUVs) are seen as a safe and cost-effective platforms for performing a myriad of underwater missions. These vehicles are equipped with multiple sensors which, combined with their long endurance, can produce large amounts of data, especially when used for video capturing. These data need to be transferred to the surface to be processed and analyzed. When considering deep sea operations, where surfacing before the end of the mission may be unpractical, the communication is limited to low bitrate acoustic communications, which make unfeasible the timely transmission of large amounts of data unfeasible. The usage of AUVs as data mules is an alternative communications solution. Data mules can be used to establish a broadband data link by combining short-range, high bitrate communications (e.g., RF and wireless optical) with a Delay Tolerant Network approach. This paper presents an enhanced version of UDMSim, a novel simulation platform for data muling communications. UDMSim is built upon a new realistic AUV Motion and Localization (AML) simulator and Network Simulator 3 (ns-3). It can simulate the position of the data mules, including localization errors, realistic position control adjustments, the received signal, the realistic throughput adjustments, and connection losses due to the fast SNR change observed underwater. The enhanced version includes a more realistic AML simulator and the antenna radiation patterns to help evaluating the design and relative placement of underwater antennas. The results obtained using UDMSim show a good match with the experimental results achieved using an underwater testbed. UDMSim is made available to the community to support easy and faster evaluation of underwater data muling oriented communications solutions and to enable offline replication of real world experiments. Full article
(This article belongs to the Special Issue Selected Papers from 16th&17th Wireless and Mobile Computing, Networking And Communications (WiMob 2020&2021))
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18 pages, 467 KiB  
Article
Slice Function Placement Impact on the Performance of URLLC with Multi-Connectivity
by Abdellatif Chagdali, Salah Eddine Elayoubi and Antonia Maria Masucci
Computers 2021, 10(5), 67; https://0-doi-org.brum.beds.ac.uk/10.3390/computers10050067 - 18 May 2021
Cited by 5 | Viewed by 2331
Abstract
Network slicing has emerged as a promising technical solution to ensure the coexistence of various 5G services. While the 5G architecture evolution for supporting slicing has been exhaustively studied, the architectural option impacts on RAN resource allocation efficiency remain unclear. This article fills [...] Read more.
Network slicing has emerged as a promising technical solution to ensure the coexistence of various 5G services. While the 5G architecture evolution for supporting slicing has been exhaustively studied, the architectural option impacts on RAN resource allocation efficiency remain unclear. This article fills a gap in this area by evaluating the impact of architecture choices on the quality of service of different services in the new 5G ecosystem, focusing on ultra-reliable low-latency communication applications. We propose architectural options based on the placement of the entities responsible for implementing these functions. We then assess their impact on the radio resource allocation flexibility when slices span two radio access technologies with redundant coverage. Our numerical experiments showed that the slice management function placement plays a pivotal role in choosing an adequate radio resource allocation scheme for URLLC slices. Full article
(This article belongs to the Special Issue Selected Papers from 16th&17th Wireless and Mobile Computing, Networking And Communications (WiMob 2020&2021))
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22 pages, 4160 KiB  
Article
LoRa Channel Characterization for Flexible and High Reliability Adaptive Data Rate in Multiple Gateways Networks
by Ulysse Coutaud, Martin Heusse and Bernard Tourancheau
Computers 2021, 10(4), 44; https://0-doi-org.brum.beds.ac.uk/10.3390/computers10040044 - 02 Apr 2021
Cited by 7 | Viewed by 3580
Abstract
We characterize the LoRa channel in terms of multi-path fading, loss burstiness, and assess the benefits of Forward Error Correction as well as the influence of frame length. We make these observations by synthesizing extensive experimental measurements realized with The Things Network in [...] Read more.
We characterize the LoRa channel in terms of multi-path fading, loss burstiness, and assess the benefits of Forward Error Correction as well as the influence of frame length. We make these observations by synthesizing extensive experimental measurements realized with The Things Network in a medium size city. We then propose to optimize the LoRaWAN Adaptive Data Rate algorithm based on this refined LoRa channel characterization and taking into account the LoRaWAN inherent macro-diversity from multi-gateway reception. Firstly, we propose ADRopt, which adjusts Spreading Factor and frame repetition number to maintain the communication below a target Packet Error Rate ceiling with optimized Time-On-Air. Secondly, we propose ADRIFECC, an extension of ADRopt in case an Inter-Frame Erasure Correction Code is available. The resulting protocol provides very high reliability even over low quality channels, with comparable Time on Air and similar downlink usage as the currently deployed mechanism. Simulations corroborate the analysis, both over a synthetic random wireless link and over replayed real-world packet transmission traces. Full article
(This article belongs to the Special Issue Selected Papers from 16th&17th Wireless and Mobile Computing, Networking And Communications (WiMob 2020&2021))
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30 pages, 5824 KiB  
Article
A Geometric Approach to Noisy EDM Resolution in FTM Measurements
by Jerome Henry, Nicolas Montavont, Yann Busnel, Romaric Ludinard and Ivan Hrasko
Computers 2021, 10(3), 33; https://0-doi-org.brum.beds.ac.uk/10.3390/computers10030033 - 12 Mar 2021
Cited by 2 | Viewed by 2051
Abstract
Metric Multidimensional Scaling is commonly used to solve multi-sensor location problems in 2D or 3D spaces. In this paper, we show that such technique provides poor results in the case of indoor location problems based on 802.11 Fine Timing Measurements, because the number [...] Read more.
Metric Multidimensional Scaling is commonly used to solve multi-sensor location problems in 2D or 3D spaces. In this paper, we show that such technique provides poor results in the case of indoor location problems based on 802.11 Fine Timing Measurements, because the number of anchors is small and the ranging error asymmetrically distributed. We then propose a two-step iterative approach based on geometric resolution of angle inaccuracies. The first step reduces the effect of poor ranging exchanges. The second step reconstructs the anchor positions, starting from the distances of highest likely-accuracy. We show that this geometric approach provides better location accuracy results than other Euclidean Distance Metric techniques based on Least Square Error logic. We also show that the proposed technique, with the input of one or more known location, can allow a set of fixed sensors to auto-determine their position on a floor plan. Full article
(This article belongs to the Special Issue Selected Papers from 16th&17th Wireless and Mobile Computing, Networking And Communications (WiMob 2020&2021))
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