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    Tytuł:
    Review of Simulators for Wireless Mesh Networks
    Autorzy:
    Owczarek, P.
    Zwierzykowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/308567.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    simulators
    wireless mesh networks
    Opis:
    The research of computer networks construction of models that reflect the current audited environment to carry out practical research is extremely dicult and often involves signicant costs. Hence, the popularity of simulation tools that help developers to determine as early as at the stage of the simulation whether a given solution can be deployed in a real network. However, over time many dierent simulation tools have been developed, each with dierent characteristics, dierent uses, dierent strengths and weaknesses. It is the task of the researcher then to select, before starting the actual research, one of the available simulators in accordance with the needs and adopted criteria of evaluation. In the article the authors present issues related to the simulation tools and the main advantages of simulation as well as their drawbacks. To help researchers select an appropriate simulation environment, the authors present statistical information gathered during a literature survey of a number of research articles from the most popular publishers in which the selected simulators were used in initial system design.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 3; 82-89
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ubiquity of Client Access in Heterogeneous Access Environment
    Autorzy:
    Gierłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/308576.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    handover
    mesh networks
    mobility
    technological networks
    ubiquitous access
    wireless networks
    Opis:
    With popularization of mobile computing and diverse offer of mobile devices providing functionality comparable to personal computers, the necessity of providing network access for such users cannot be disputed. The requirement is further reinforced by emergence of general purpose mobile operating systems which provide their full functionality only with network connectivity available and popular XaaS (Everything as a Service) approach. In this situation and combined with the fact that most Internet-based services are able to function efficiently even in best effort environment, requirement of ubiquity of network access becomes one of the most important elements of today’s computing environment. This paper presents a general overview of the the vast group of mechanisms and technologies utilized in modern attempts to efficiently provide ubiquity on network access in heterogeneous environment of today’s access systems. It starts with division of users interested in ubiquitous network access into broad groups of common interest, complete with their basic requirements and access characteristics, followed by a survey of both already popular and new wireless technologies suitable to provide such access. Then a general discussion of most important challenges which must be addressed while attempting to fulfill the above goal is provided, addressing topics such as handover control and mobility management.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 3; 3-16
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of a Wireless Mesh Network Constructed with the Use of IQRF Modules in the Indoor Environment
    Autorzy:
    Pluta, Sławomir
    Roszkowski, Patryk
    Powiązania:
    https://bibliotekanauki.pl/articles/227044.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless mesh networks
    WMN
    IQRF
    indoor environment
    IoT
    Opis:
    The subject of the article is the design and practical implementation of the wireless mesh network. IQRF radio modules were used for the network design. The IQRF® technique has enabled the construction of a mesh network with the possibility of reconfiguration. The theoretical part contains a description of the IQRF® hardware solutions used. The practical scope includes the design part, where the configuration of the radio modules was carried out and the parameters of the radio network were set to allow its implementation in various topologies. Then, a wireless network consisting of 10 IQRF modules was launched in the P3 building of the Opole University of Technology. At this stage, configured radio modules were placed in selected rooms on all five floors of the building in order to carry out tests of the radio network constructed in this way. The tests included measuring the packet transmission delay time as well as the received signal strength. Research was carried out for several network topologies.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 3; 537-544
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    IPv6 in Wireless Networks - Selected Issues
    Autorzy:
    Kukliński, S.
    Radziszewski, P.
    Wytrębowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/309582.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    extension headers
    IPv6
    WiFi
    wireless mesh networks
    Opis:
    The article presents issues concerning the construction of autonomous wireless networks based on the IPv6 protocol. Prospects of implementation of IPv6 in wireless networks and IPv6 features and mechanisms important in such applications are discussed. Research directions related to the use of IPv6 in wireless networks are also outlined. Then the selected concepts are described, arising in the course of the EFIPSANS (Exposing the Features in IP Version Six Protocols that can be Exploited/Extended for the Purposes of Designing/Building Autonomic Networks and Services) project, during studies on the autonomy of nodes and routing configuration for wireless networks. Concepts presented here apply to wireless ad hoc mesh networks. Discussed is their nature and aspects related to auto-configuration and autonomously operating routing. In particular, there is a Wireless Autonomic Routing Framework (WARF) architecture presented.
    Źródło:
    Journal of Telecommunications and Information Technology; 2011, 2; 24-30
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Delay-Aware NUM-Driven Framework in an Internetwork Environment
    Autorzy:
    Urbański, M.
    Poszwa, M.
    Misiorek, P
    Gallucci, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/307614.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    DANUMS
    Network Utility Maximization
    seamless mobility
    WiOptiMo
    Wireless Mesh Networks
    Opis:
    Nowadays, due to emergence of cloud services, even the basic uses of personal computers may require the access to the Internet. In this paper modifications to Delay-Aware Network Utility Maximization System (DANUMS) are presented, which enable it to be deployed in an internetwork environment. The proposed solution consists of DANUMS and WiOptiMo systems, which cooperate by exchanging measurements of transmitted traffic in order to improve the network utility. Additionally, WiOptiMo enhances mobility by providing facilities for soft handover. Experiments presented in this paper illustrate the benefits gained from the integrated system application.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 3; 17-25
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NetBaltic system – heterogeneous wireless network for maritime communications
    Autorzy:
    Hoeft, M.
    Gierłowski, K.
    Rak, J.
    Woźniak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/260004.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    maritime communication systems
    heterogeneous maritime network
    mobility management
    maritime mesh networks
    delaytolerant networks
    Opis:
    In case of maritime communications, we observe a growing interest in deployment of multitask satellite-based solutions and development of new maritime-specific systems intended for improvements in safety of e-navigation. Analysis of different types of currently used maritime communication systems leads, however, to a conclusion that neither global and still very expensive satellite systems nor cheaper, but short-ranged transmission technologies can, on their own, fully meet the today’s expectations and quality requirements formulated for broadband maritime systems. This lack of reliable solutions, offering high throughput and ubiquitous availability of coverage to a wide audience at a relatively low price is one of the main barriers in a widespread implementation of e-navigation initiatives. This issue is addressed in the netBaltic project with the objective to design, deploy and validate in a real maritime environment a non-satellite wireless communication system enabling ship-to-ship and ship-to-shore information exchange via a multi-hop network composed of onshore base stations, maritime vessels and other transit elements such as buoys. In this paper, the idea of a heterogeneous wireless maritime system is presented. Details of the proposed netBaltic node architecture are described highlighting the solutions introduced in the project as a response to specific maritime communication requirements. Numerical results of communication area coverage are presented for four different scenarios utilizing different wireless transmission technologies. In particular, they indicate that when using appropriate wireless communication solutions, the number of vessels being able to connect to Internet is significantly increased as compared to traditional wireless systems (capable of one-hop communication) from 14% for short-range transmission technologies up to as high as 127% in case when relatively long-range transmission technologies are employed within the system.
    Źródło:
    Polish Maritime Research; 2018, 2; 14-26
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A WSN architecture for building resilient, reactive and secure wireless sensing systems
    Autorzy:
    Gburzyński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/1954583.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska
    Tematy:
    wireless sensor networks
    mesh networks
    reliability
    security
    internet of things
    bezprzewodowe sieci czujnikowe
    sieci typu mesh
    niezawodność
    bezpieczeństwo
    internet rzeczy
    Opis:
    We introduce a wireless sensor network (WSN) architecture intended for massive deployments in custom applications where the primary goal is the collection of low-volume (e.g., telemetric) data possibly augmented with spontaneous special events, like alerts or alarms. The network is built of inexpensive, small-footprint, energy-frugal, possibly mobile nodes running reactive programs and self-organizing themselves into resilient distributed systems in a manner embracing the limited capabilities of the devices as well as the unreliable nature of ad-hoc wireless communication. We propose and elaborate on a holistic approach to constructing complete WSN applications. Our approach incorporates a certain unified programming and communication paradigm. In addition to producing small, energy-efficient, self-documenting and reliable programs for ultra-small-footprint motes, that paradigm enables authoritative virtual execution of complete application, thus facilitating their rapid development, testing, augmentation and modification.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2021, 25, 2; 141-181
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of energy consumption in 6TiSCH network nodes working in sub-GHz band
    Autorzy:
    Kubaszek, Mateusz
    Macheta, Jan
    Krzak, Łukasz
    Worek, Cezary
    Powiązania:
    https://bibliotekanauki.pl/articles/963844.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    IEEE802.15.4e
    TSCH
    6TiSCH
    energy
    modelling
    energy consumption
    wireless sensor networks
    industrial IoT
    mesh networks
    Opis:
    The 6TiSCH communication stack enables IPv6 networking over the TSCH (Time Slotted Channel Hopping) mode of operation defined in IEEE 802.15.4. Lately it became an attractive solution for Low power and Lossy Networks (LLNs), suitable for Industrial Internet (IIoT) applications. This article introduces a credible energy consumption model for the 6TiSCH network nodes, operating in the 863-870 MHz band. It presents the analysis leading to the construction of the model as well as verification through experimental measurements which showed 98% accuracy in determining power consumption for two different network topologies. The article includes reliable battery lifetime predictions for transit and leaf nodes along with other parametric study results.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 201-210
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowoczesne rozwiązania w zakresie segregacji medycznej na przykładzie systemu EvaCopNet
    Modern Solutions in the Field of Triage Illustrated by the Example of the EvaCopNet System
    Autorzy:
    Ciuka-Witrylak, M.
    Jarosławska-Kolman, K.
    Grosset, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/372846.pdf
    Data publikacji:
    2018
    Wydawca:
    Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
    Tematy:
    elektronika biomedyczna
    saturacja krwi
    ratownictwo
    sieci Mesh
    czujniki wielkości biologicznych
    tętno
    biomedical electronics
    blood saturation
    rescue
    Mesh networks
    biometric sensors
    heart rate
    Opis:
    Cel: Celem artykułu jest przedstawienie koncepcji systemu EvaCopNet oraz wyników badań dotyczących zastosowanych rozwiązań automatycznego pomiaru podstawowych parametrów życiowych, transmisji otrzymanych pomiarów do jednostki obliczeniowej analizującej je pod kątem poziomu zagrożenia życia i wspomagania procesu ustalania kolejności ewakuacji medycznej. Wprowadzenie: W przypadku zdarzeń masowych, w których liczba poszkodowanych przekracza możliwości ratownicze jednostek udzielających kwalifikowanej pierwszej pomocy, włączenie w proces ewakuacji i ratowania poszkodowanych urządzenia monitorującego (znakującego) funkcje życiowe i przesyłającego informacje w trybie on-line bezpośrednio lub za pośrednictwem bezzałogowego statku powietrznego (unmanned aerial vehicle – UAV) do stanowiska dowodzenia zwiększa poczucie bezpieczeństwa zarówno tych osób, jak i ratowników. W wielu krajach są tworzone i rozwijane systemy ewakuacji medycznej w trybie nagłego zagrożenia życia wszystkich osób poszkodowanych w zdarzeniu. Prezentowany system przeznaczony jest do wspierania procesu ewakuacji i ratowania poszkodowanych. Obejmuje on następujące obszary rozwiązań technicznych: mikromoduł oznakowania poszkodowanego FT (FlagTag), moduł radiowy i organizacji sieci Mesh z wykorzystaniem UAV, moduł lokalizacji poszkodowanych QFind oraz programowy moduł integratora danych. Autorzy opisali funkcje i kierunek rozwoju mikromodułu oznakowania poszkodowanego FT. Wnioski: Analiza zdarzeń, w których można wykorzystać system EvaCopNet, oraz przeprowadzone badania poligonowe potwierdziły poprawność przyjętych rozwiązań z zakładaną funkcjonalnością systemu, a także uwidoczniły jego duży potencjał aplikacyjny. Opracowane rozwiązania i składowe systemu EvaCopNet zaprojektowane są tak, żeby można je było rozwijać wraz z postępem technicznym i technologicznym oraz zwiększającą się wiedzą o występujących lub mogących wystąpić zdarzeniach masowych. Znaczenie dla praktyki: System EvaCopNet jest unikatowym rozwiązaniem technologicznym, na podstawie którego można opracować w pełni funkcjonalny system ewakuacji i ratowania z elementami monitorowania poszkodowanych podczas katastrof lub klęsk żywiołowych. Wykorzystanie systemu w realnych działaniach ratowniczych pozwoli na zmniejszenie liczby ratowników bezpośrednio zaangażowanych w obserwację poszkodowanych i w nadzór nad nimi, a kierującemu działaniem ratowniczym umożliwi skierowanie dodatkowych ratowników do bezpośrednich działań w strefie zagrożenia. System przeznaczony jest dla podmiotów Krajowego Systemu Ratowniczo-Gaśniczego – Państwowej Straży Pożarnej oraz Ochotniczej Straży Pożarnej.
    Aim: The purpose of this article is to present the concept of the EvaCopNet system and the results of research on the applied solutions for the automatic measurement of basic vital signs, transmission of received measurements to the calculating unit which analyses the level of threat to life and supports the process of determining the order of medical evacuation. Introduction: In the case of mass events, where the number of victims exceeds the emergency rescue potential of qualified assistance units, increasing the sense of security for both the injured and the rescuers is possible through a monitoring device (marking) vital signs of the victim and sending information on-line directly or via the UAV to the command post included in the evacuation and rescue process. In many countries, systems of medical emergency evacuation of all people injured in an event are being created and developed. The presented system is designed to support the process of evacuation and rescue of the injured. It includes the following technical solutions: a micromodule marking FT (FlagTag), a radio and organisation module for the Mesh network using unmanned aerial vehicles and a Q-Find victim location module, as well as a software integrator module. The authors described the functions and direction of development of the micromodule marking the injured – FT. Conclusions: An analysis of events in which the EvaCopNet system can be used as well as the conducted field tests confirm the validity of the systems’ functionality and of the adopted solutions, and also demonstrate its great application potential. The developed solutions and components of the EvaCopNet system are designed in such a way that it can be developed along with technical and technological progress as well as knowledge of mass events that may occur. Implications for the practice: The EvaCopNet system is a unique technological solution, on the basis of which a fully functional evacuation and rescue system can be developed with elements of monitoring of injured people during disasters or natural disasters. The use of the system in real rescue operations will make it possible to decrease the number of the rescuers directly involved in observation of and supervision over the injured; on the other hand, the rescue operation supervisor will be able to direct additional forces to proximate actions in the danger zone. The system is dedicated to entities of the National Firefighting and Rescue System – State Fire Service and the Volunteer Fire Service.
    Źródło:
    Bezpieczeństwo i Technika Pożarnicza; 2018, 50, 2; 74-89
    1895-8443
    Pojawia się w:
    Bezpieczeństwo i Technika Pożarnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interworking and cross-layer service discovery extensions for IEEE 802.11s wireless mesh standard
    Autorzy:
    Gierłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/307686.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    802.11
    cross-layer
    interworking
    mesh
    wireless networks
    Opis:
    With the rapid popularization of mobile end-user electronic devices, wireless network technologies begin to play a crucial role as networks access technologies. While classic point-to-multipoint wireless access systems, based on fixed infrastructure of base stations providing access to clients, remain the main most popular solution, an increasing attention is devoted to wireless mesh systems, where each connecting client can extend overall resources of the network by becoming a network node capable of forwarding transit traffic. This ability results in severe reduction of the necessary network infrastructure, provides through coverage (thereby offering significant step towards ubiquity of network access) and offers massive redundancy. One of the most promising wireless mesh solutions currently being developed is an IEEE 802.11s standard, based on popular Wi-Fi technology. It combines low deployment costs with comprehensive suite of mechanisms able to operate a self-forming, autoconfigurable, dynamically extending, and secure mesh solution. However, despite its advantages, the standard lacks sufficient support for a number of functionalities, which can lead to significant inefficiency and degradation of service quality in real-world IEEE 802.11s network deployments. In the paper we propose a number of extensions of IEEE 802.11s mechanisms, designed to provide better service quality in case of real-world deployment scenarios, especially in case of large systems. Both propositions introduce modifications to mesh path discovery and interworking procedures, while retaining compatibility with standard solution. Their basic functionality and efficiency have been verified by means of simulation model in large-scale, self-organizing mesh structure. Subsequently they have been implemented and tested in real-world, access network testbed deployment. The results clearly indicate their utility, particularly in case of larger deployments of this network system type.
    Źródło:
    Journal of Telecommunications and Information Technology; 2013, 3; 97-105
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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