Autor: Zwierzykowski, Piotr - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Simulations of the MAC Layer in the LoRaWAN Networks
Autorzy:: Piechowiak, Maciej
Zwierzykowski, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/307678.pdf
Data publikacji:: 2020
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: Internet of Things
LoRa
LoRaWAN
LPWAN
simulations
Opis:: The Internet of Things is changing the approach to data transmission, protocol design and network services. The challenge faced by designers of IoT solutions is to determine the scalability of a given technology, with a particular emphasis placed on unlicensed frequency bandwidth (ISM) transmission in highly urbanized areas. Because the design and implementation of a wireless network for the Internet of Things, relying on each of the presented technologies, is expensive and time consuming, it must be preceded by a performance assessment based on computer simulations. The literature contains various approaches to modeling the mechanisms of the MAC layer of LoRa technology and to its implementation in LoRaWAN networks. The article provides an overview of major LoRa MAC network simulators. It presents and comments on the most important research results obtained by the authors of the aforementioned software.
Źródło:: Journal of Telecommunications and Information Technology; 2020, 2; 22-27
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of Multicast Algorithm Evaluation Results in Low and High Multicast Saturation Environments
Autorzy:: Stachowiak, Krzysztof
Zwierzykowski, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/309461.pdf
Data publikacji:: 2019
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: quality of service
multicast
routing
multicast saturation
Opis:: The multicast quality of service-enabled routing is a computationally challenging task. Despite ongoing research eﬀorts, the associated mathematical problems are still considered to be NP-hard. In certain applications, computational complexity of ﬁnding the optimal connection between a set of network devices may be a particularly diﬃcult challenge. For example, connecting a small group of participants of a teleconference is not much more complex than setting up a set of mutual point-to-point connections. On the other hand, satisfying the demand for such services as IPTV, with their receivers constituting the majority of the network, requires applying appropriate optimization methods in order to ensure real system execution. In this paper, algorithms solving this class of problems are considered. The notion of multicast saturation is introduced to measure the amount of multicast participants relative to the entire network, and the eﬃciency of the analyzed algorithms is evaluated for diﬀerent saturation degrees.
Źródło:: Journal of Telecommunications and Information Technology; 2019, 3; 3-7
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The New Analytical Model of Free Resources in the Limited Availability Resources
Autorzy:: Nowak, Błażej
Stasiak, Maciej
Zwierzykowski, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/27312948.pdf
Data publikacji:: 2023
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: analytical modeling
limited-availability group
multi-service system
networks
Opis:: The article presents a new analytical model for determining the probability of availability of a certain amount of well-defined free resources (e.g. a link) in a group of dedicated resources (e.g. a group of links) jointly serving a mixture of different classes of multiservice traffic. The presented method can be used to model access to resources in data centers, in particular in the software-defined networks, assuming – for reliability reasons – that the user should have access to a certain minimum number of specific separated resources. The proposed analytical model was verified by appropriate simulation experiments, which confirmed the satisfactory accuracy of the results obtained.
Źródło:: Journal of Telecommunications and Information Technology; 2023, 4; 102--107
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Telecom Operator’s Approach to QoE
Autorzy:: Kowalik, Karol
Andruloniw, Paweł
Partyka, Bartosz
Zwierzykowski, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/2142309.pdf
Data publikacji:: 2022
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: quality of experience
quality of service
Opis:: Telecommunication networks are ever more frequently relying on artificial intelligence and machine learning techniques to detect specific use patterns or potential errors and to take automated decisions when these are encountered. This concept requires that methods be employed to measure the level of quality of a given telecommunication service, i.e. to verify quality of service (QoS) metrics. In a broader context, methods assessing the entire user experience (quality of experience – QoE) are required as well. In this article, various approaches to assessing QoS, QoE and the related metrics are presented, with a view to implement these at an FTTH network operator in Poland. Since this article presents the architecture of the system used to analyze QoE performance based on a number of QoS metrics collected by the operator, we also provide a comprehensive introduction to the QoS and QoE metrics used herein.
Źródło:: Journal of Telecommunications and Information Technology; 2022, 2; 26--34
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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