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Katalog Publikacji

Rok 2024
Rok 2023
  • 5G Millimeter Wave Network Optimization: Dual Connectivity and Power Allocation Strategy
    Publikacja

    - IEEE Access - Rok 2023

    The fifth generation (5G) of mobile networks utilizing millimeter Wave (mmWave) bands can be considered the leading player in meeting the continuously increasing hunger of the end user demands in the near future. However, 5G networks are characterized by high power consumption, which poses a significant challenge to the efficient management of base stations (BSs) and user association. Implementing new power consumption and user...

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  • 5G/6G optical fronthaul modeling: cost and energy consumption assessment

    In fifth generation (5G) and the future beyond 5G (6G) radio access networks (RANs), the cost of fronthaul deployment is a main challenge for mobile network operators. Depending on different constraints, there are various solutions to deploy an efficient fronthaul. Fiber-optic-based fronthaul offers long-term support with regard to a rapid increase in capacity demands. When fiber connections, either point-to-point (P2P) or point-to-multipoint...

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  • Integracja bezprzewodowych heterogenicznych sieci IP dla poprawy efektywności transmisji danych na morzu
    Publikacja

    - Rok 2023

    Wraz ze wzrostem istotności środowiska morskiego w naszym codziennym życiu np. w postaci zwiększonego wolumenu transportu realizowanego drogą morską. czy zintensyfikowanych prac dotyczących obserwacji i monitoringu środowiska morskiego, wzrasta również potrzeba opracowania efektywnych systemów komunikacyjnych dedykowanych dla tego środowiska. Heterogeniczne systemy łączności bezprzewodowej integrowane na poziomie warstwy sieciowej...

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  • Introduction to the ONDM 2022 special issue
    Publikacja
    • J. Turkiewicz
    • T. Gomes
    • M. Klinkowski
    • J. Rak
    • M. Tornatore

    - Journal of Optical Communications and Networking - Rok 2023

    This JOCN special issue contains extended versions of selected papers presented at the 26th International Conference on Optical Network Design and Modeling (ONDM 2022), which took place 16–19 May 2022 at Warsaw University of Technology, Warsaw, Poland. The topics covered by the papers represent trends in optical networking research: application of machine learning to network management, cross-layer network performance optimization,...

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  • Nowe protokoły transportowe w sieciach IP. Analiza porównawcza wybranych mechanizmów w protokołach SCTP i QUIC

    Zestaw protokolarny TCP/IP opisuje podstawową koncepcję organizacji pracy Internetu. Z tej racji jest przedmiotem zainteresowania oraz stałych analiz zarówno operatorów, użytkowników, jak też badaczy zagadnień sieciowych, a wreszcie i projektantów, by reagować na pojawiające się nowe potrzeby. Działania takie, przynajmniej częściowo, są wymuszane zarówno przez wymagania nowych multimedialnych aplikacji - na najwyższym poziomie...

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  • On the Importance of Resilience Engineering for Networked Systems in a Changing World
    Publikacja
    • D. Hutchison
    • D. Pezaros
    • J. Rak
    • P. Smith

    - IEEE COMMUNICATIONS MAGAZINE - Rok 2023

    Resilience is featured increasingly often in the media, usually applied to society when faced, for example, with disasters such as flooding and the enormous challenges that the Covid-19 pandemic posed. There are now many resilience-related discussion groups worldwide, and some standards initiatives devoted in particular to city resilience. However, there is relatively little explicit interest in resilience engineering for communication...

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  • Scheduling for Industrial Control Traffic Using Massive MIMO and Large Intelligent Surfaces
    Publikacja

    - Rok 2023

    Industry 4.0, with its focus on flexibility and customizability, is pushing in the direction of wireless communication in future smart factories, in particular massive multiple-input multiple-output (MIMO), and its future evolution Large Intelligent Surfaces (LIS), which provide more reliable channel quality than previous technologies. As such, there arises the need to perform efficient scheduling of industrial control traffic...

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  • The Idea of a Student Research Project as a Method of Preparing a Student for Professional and Scientific Work
    Publikacja

    In the paper we present the idea and implementation of a student research project course within the master’s program at the Faculty of Electronics, Telecommunications and Informatics, Gdansk Tech. It aims at preparing students for performing research and scientific tasks in future professional work. We outline the evolution from group projects into research project and the current deployment of both at bachelor’s and master’s levels...

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  • The need for new transport protocols on the INTERNET

    The TCP/IP protocol suite is widely used in IP networks, regardless of diverse environments and usage scenarios. Due to the fact of being the basic concept of organizing the work of the Internet, it is the subject of interest and constant analysis of operators, users, network researchers, and designers. The Internet is a "living" organism in which new needs appear all the time. This is particularly important due to the emerging...

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  • Wireless Link Selection Methods for Maritime Communication Access Networks—A Deep Learning Approach
    Publikacja

    In recent years, we have been witnessing a growing interest in the subject of communication at sea. One of the promising solutions to enable widespread access to data transmission capabilities in coastal waters is the possibility of employing an on-shore wireless access infrastructure. However, such an infrastructure is a heterogeneous one, managed by many independent operators and utilizing a number of different communication...

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Rok 2022
Rok 2021
  • A Survey of Fast-Recovery Mechanisms in Packet-Switched Networks
    Publikacja
    • M. Chiesa
    • A. Kamisinski
    • J. Rak
    • G. Retvari
    • S. Schmid

    - IEEE Communications Surveys and Tutorials - Rok 2021

    In order to meet their stringent dependability requirements, most modern packet-switched communication networks support fast-recovery mechanisms in the data plane. While reactions to failures in the data plane can be significantly faster compared to control plane mechanisms, implementing fast recovery in the data plane is challenging, and has recently received much attention in the literature. This survey presents a systematic,...

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  • A wireless network for off-shore marine research

    This paper presents functionality, the most important technology developments and potential use cases of digital communication system, developed to facilitate selected tasks commonly required during off-shore operations and marine research, including: broadband information sharing between platforms isolated from an on-shore communication infrastructure, acquisition of large data-sets from variety of off-shore...

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  • Assessment of Connectivity-based Resilience to Attacks Against Multiple Nodes in SDNs
    Publikacja
    • D. Santos
    • A. de Sousa
    • C. Mas-Machuca
    • J. Rak

    - IEEE Access - Rok 2021

    In Software Defined Networks (SDNs), the control plane of a network is decoupled from its data plane. For scalability and robustness, the logically centralized control plane is implemented by physically placing different controllers throughout the network. The determination of the number and placement of controllers is known as the Controller Placement Problem (CPP). In the regular (i.e., failure-free) state, the control plane...

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  • Coupling between Blood Pressure and Subarachnoid Space Width Oscillations during Slow Breathing
    Publikacja

    - ENTROPY - Rok 2021

    The precise mechanisms connecting the cardiovascular system and the cerebrospinal fluid (CSF) are not well understood in detail. This paper investigates the couplings between the cardiac and respiratory components, as extracted from blood pressure (BP) signals and oscillations of the subarachnoid space width (SAS), collected during slow ventilation and ventilation against inspiration resistance. The experiment was performed on...

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  • Disaster Resilience of Optical Networks: State of the Art, Challenges, and Opportunities
    Publikacja
    • J. Rak
    • R. Girão-Silva
    • T. Gomes
    • G. Ellinas
    • B. Kantarci
    • M. Tornatore

    - Optical Switching and Networking - Rok 2021

    For several decades, optical networks, due to their high capacity and long-distance transmission range, have been used as the major communication technology to serve network traffic, especially in the core and metro segments of communication networks. Unfortunately, our society has often experienced how the correct functioning of these critical infrastructures can be substantially hindered by massive failures triggered by natural...

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  • eFRADIR: An Enhanced FRAmework for DIsaster Resilience
    Publikacja
    • A. Pasic
    • R. Girao-Silva
    • F. Mogyorosi
    • B. Vass
    • T. Gomes
    • P. Babarczi
    • P. Revisnyei
    • J. Tapolcai
    • J. Rak

    - IEEE Access - Rok 2021

    This paper focuses on how to increase the availability of a backbone network with minimal cost. In particular, the new framework focuses on resilience against natural disasters and is an evolution of the FRADIR/FRADIR-II framework. It targets three different directions, namely: network planning, failure modeling, and survivable routing. The steady state network planning is tackled by upgrading a sub-network (a set of links termed...

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  • Enhancing Resilience of FSO Networks to Adverse Weather Conditions
    Publikacja

    - IEEE Access - Rok 2021

    Optical wireless networks realized by means of gigabit optical wireless communication (OWC) systems are becoming, in a variety of applications, an important alternative, or a complementary solution, to their fiber-based counterparts. However, performance of the OWC systems can be considerably degraded in periods of unfavorable weather conditions, such as heavy fog, which temporarily reduce the effective capacity of the network....

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  • Ensuring the QoE-Related Fairness to Reduce the User Abandonment Ratio

    These days, it is quite a challenge for app owners to keep users engaged with an app. Currently, the level of user abandonment is one of the key parameters that application owners are interested in. To meet these challenges, we are conducting an extended study of a previously proposed solution that significantly reduces the abandonment rate of a given application. The investigated solution is based on the methods of fairness using...

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  • High-Power Jamming Attack Mitigation Techniques in Spectrally-Spatially Flexible Optical Networks
    Publikacja
    • G. Savva
    • K. Manousakis
    • J. Rak
    • I. Tomkos
    • G. Ellinas

    - IEEE Access - Rok 2021

    This work presents efficient connection provisioning techniques mitigating high-power jamming attacks in spectrally-spatially flexible optical networks (SS-FONs) utilizing multicore fibers. High-power jamming attacks are modeled based on their impact on the lightpaths’ quality of transmission (QoT) through inter-core crosstalk. Based on a desired threshold on a lightpath’s QoT, the modulation format used, the length of the path,...

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  • Non-Satellite Broadband Maritime Communications for e-Navigation Services

    The development of broadband network access technologies available to users on land has triggered a rapid expansion of a diverse range of services provided by terrestrial networks. However, due to limitations of digital communication technologies in the off-shore area, the maritime ICT systems evolution so far has not followed that trend. Despite the e-navigation initiative defining the set of Maritime Services, the progress in...

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  • O neutralności, prezydencie, portalach społecznościowych i edukacji
    Publikacja

    Artykuł dotyczy neutralności sieci, która omówiona jest w kontekście zablokowania kont prezydenta USA w mediach społecznościowych. Odnosząc się do różnych znaczeń neutralności i opinii zebranych wśród informatyków, autorzy sformułowali rekomendacje dotyczące miejsca neutralności w edukacji informatycznej studentów.

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  • O opóźnieniach, kompatybilności i dyliżansach, czyli jak działa Internet
    Publikacja

    - Pismo PG - Rok 2021

    W artykule podano przykłady usług internetowych o bardzo niskiej jakości. Wykazano, iż ogromny wpływ na jakość realizacji usług ma ciągłe wykorzystywanie w Internecie rozwiązań sprzed kilkudziesięciu lat. Pokazano jak budowa Internetu wpływa na opóźnienia przekazywania danych, oraz jak utrzymywanie zasady kompatybilności wstecznej uniemożliwia skokową poprawę jakości.

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  • Optimizing FSO networks resilient to adverse weather conditions by means of enhanced uncertainty sets
    Publikacja

    - Optical Switching and Networking - Rok 2021

    This work deals with dimensioning of wireless mesh networks (WMN) composed of FSO (free space optics) links. Although FSO links realize broadband transmission at low cost, their drawback is sensitivity to adverse weather conditions causing transmission degradation on multiple links. Hence, designing such FSO networks requires an optimization model to find the cheapest configuration of link capacities that will be able to carry...

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  • Remote command and control capabilities for data acquisition systems provided by delay-tolerant network mechanisms

    The paper presents an assessment of a remote device reconfiguration service employing a Delay Tolerant Network (DTN) mechanisms. This service has been implemented as a part of a communication appliance dedicated to marine data transfer in off-shore and open sea areas. The service has been successfully deployed and validation test have been completed. The practical use-case has been defined as remote access to the equipment operating...

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  • Service-based Resilience via Shared Protection in Mission-critical Embedded Networks
    Publikacja

    Mission-critical networks, which for example can be found in autonomous cars and avionics, are complex systems with a multitude of interconnected embedded nodes and various service demands. Their resilience against failures and attacks is a crucial property and has to be already considered in their design phase. In this paper, we introduce a novel approach for optimal joint service allocation and routing, leveraging virtualized...

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Rok 2020
  • A reactive algorithm for deducing nodal forwarding behavior in a multihop ad-hoc wireless network in the presence of errors

    A novel algorithm is presented to deduce individual nodal forwarding behavior from standard end-to-end acknowledgments. The algorithm is based on a well-established mathematical method and is robust to network related errors and nodal behavior changes. The proposed solution was verified in a network simulation, during which it achieved sound results in a challenging multihop ad-hoc network environment.

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  • Adaptive Positioning Systems Based on Multiple Wireless Interfaces for Industrial IoT in Harsh Manufacturing Environments
    Publikacja
    • J. Mongay Batalla
    • C. X. Mavromoustakis
    • G. Mastorakis
    • N. Xiong, Naixue
    • J. Woźniak

    - IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS - Rok 2020

    As the industrial sector is becoming ever more flexible in order to improve productivity, legacy interfaces for industrial applications must evolve to enhance efficiency and must adapt to achieve higher elasticity and reliability in harsh manufacturing environments. The localization of machines, sensors and workers inside the industrial premises is one of such interfaces used by many applications. Current localization-based systems...

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  • Comparison of near infrared spectroscopy (NIRS) and near-infrared transillumination-backscattering sounding (NIR-T/BSS) methods
    Publikacja

    - Scientific Reports - Rok 2020

    The aim of the study was to compare simultaneously recorded a NIR-T/BSS and NIRS signals from healthy volunteers. NIR-T/BSS is a device which give an ability to non-invasively detect and monitor changes in the subarachnoid space width (SAS). Experiments were performed on a group of 30 healthy volunteers (28 males and 2 females, age 30.8 ± 13.4 years, BMI = 24.5 ± 2.3 kg/m2). We analysed recorded signals using analysis methods based...

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  • Design of Resilient Vehicle-to-Infrastructure Systems
    Publikacja

    - Rok 2020

    Vehicular ad hoc networks (VANETs) have recently gained noticeable attention due to advantages in improving road traffic safety, shaping the road traffic and providing infotainment opportunities to travellers. However, transmission characteristics following from the IEEE 802.11p standard and the high mobility of VANET nodes remarkably reduce the lifetime, reach and capacity of wireless links, and often lead to simultaneous disruptions...

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  • Disaster-Resilient Routing Schemes for Regional Failures
    Publikacja
    • T. Gomes
    • D. Santos
    • R. Girão-Silva
    • L. Martins
    • B. Nedic
    • M. Gunkel
    • B. Vass
    • J. Tapolcai
    • J. Rak

    - Rok 2020

    Large-scale natural disasters can have a profound effect on the telecommunication services in the affected geographical area. Hence, it is important to develop routing approaches that may help in circumventing damaged regional areas of a network. This prompted the development of geographically diverse routing schemes and also of disaster-risk aware routing schemes. A minimum-cost geodiverse routing, where a minimum geographical...

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  • Enhancing Availability for Critical Services
    Publikacja
    • T. Gomes
    • L. Martins
    • R. Girão-Silva
    • D. Tipper
    • A. Pašić
    • B. Vass
    • L. Garrote
    • U. J. Nunes
    • M. Zachariasen
    • J. Rak

    - Rok 2020

    Traditional approaches to provide classes of resilient service take the physical network availability as an input and then deploy redundancy and restoration techniques at various layers, often without full knowledge of mappings between layers. This makes it hard (and often inefficient) to ensure the high availability required by critical services which are typically a small fraction of the total traffic. Here, the innovative technique...

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  • Fundamental Schemes to Determine Disjoint Paths for Multiple Failure Scenarios
    Publikacja
    • T. Gomes
    • L. Jorge
    • R. Girão-Silva
    • J. Yallouz
    • P. Babarczi
    • J. Rak

    - Rok 2020

    Disjoint path routing approaches can be used to cope with multiple failure scenarios. This can be achieved using a set of k (k> 2) link- (or node-) disjoint path pairs (in single-cost and multi-cost networks). Alternatively, if Shared Risk Link Groups (SRLGs) information is available, the calculation of an SRLG-disjoint path pair (or of a set of such paths) can protect a connection against the joint failure of the set of links...

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  • Fundamentals of Communication Networks Resilience to Disasters and Massive Disruptions
    Publikacja
    • J. Rak
    • D. Hutchison
    • J. Tapolcai
    • R. Bruzgiene
    • M. Tornatore
    • C. Mas-Machuca
    • M. Furdek
    • P. Smith

    - Rok 2020

    Communication networks are exposed to a variety of massive failure events following from activities of nature, weather-induced disruptions, technology-implied problems, and malicious human activities. In this chapter, we first highlight the characteristics of these scenarios and discuss example failure events reported during the last three decades. Next, we explain the concept of network resilience and present an overview of major...

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  • Improving the Survivability of Carrier Networks to Large-Scale Disasters
    Publikacja
    • A. de Sousa
    • J. Rak
    • F. Barbosa
    • D. Santos
    • D. Mehta

    - Rok 2020

    This chapter is dedicated to the description of methods aiming to improve the survivability of carrier networks to large-scale disasters. First, a disaster classification and associated risk analysis is described, and the disaster-aware submarine fibre-optic cable deployment is addressed aiming to minimize the expected costs in case of natural disasters. Then, the chapter addresses the improvement of the network connectivity resilience...

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