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275 results on '"Grochla, Krzysztof"'

6. LP WAN Gateway Location Selection Using Modified K-Dominating Set Algorithm

Author

Frankiewicz, Artur, Glos, Adam, Grochla, Krzysztof, Łaskarzewski, Zbigniew, Miszczak, Jarosław, Połys, Konrad, Sadowski, Przemysław, and Strzoda, Anna

Subjects
Computer Science - Networking and Internet Architecture, Computer Science - Discrete Mathematics, C.2.5, B.8.1, G.2.0
Abstract

The LP WAN networks use gateways or base stations to communicate with devices distributed on large distances, up to tens of kilometres. The selection of optimal gateway locations in wireless networks should allow providing the complete coverage for a given set of nodes, taking into account the limitations, such as the number of nodes served per access point or required redundancy. In this paper, we describe the problem of selecting the base stations in a network using the concept of $k$-dominating set. In our model, we include information about the required redundancy and spectral efficiency. We consider the additional requirements on the resulting connections and provide the greedy algorithm for solving the problem. The algorithm is evaluated in randomly generated network topologies and using the coordinates of sample real smart metering networks., Comment: 14 pages, 7 figures

Published
2020
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7. Transmit power optimization in cellular networks with nomadic base stations

Author

Grochla, Krzysztof and Slabicki, Mariusz

Subjects
Computer Science - Networking and Internet Architecture
Abstract

The increasing demand for cellular network capacity can be mitigated through the installation of nomadic eNodeB, which serve a temporal increase of traffic volume in specific area. When nomadic cells are deployed, the transmission power of neighbor base stations needs to be optimized to limit the inter-cell interferences. We analyze the problem of neighborhood selection for the optimization, to define what part of the networks needs to be reconfigured when new base station is added. We evaluate the iterative approach, with increasing range of neighboring cells being reconfigured and propose a novel, sampling based local TX power reconfiguration method, which is evaluated by a numerical model in both regular (honeycomb) topology and in realistic topology reflecting locations of cells in a city. The analysis confirms that the proposed algorithm allows to select very few neighboring cells which need to be reconfigured (in majority of the cases less than 10 cells) and achieve similar efficacy as global optimization, with total network throughput different by less than 1\% comparing to the global optimization.

Published
2019

8. Channel State Information Variability in BLE Positioning Measurements

Author

Marek, Daniel, Grochla, Krzysztof, Duda, Jakub, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Borzemski, Leszek, editor, Selvaraj, Henry, editor, and Świątek, Jerzy, editor

Published
2022
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11. LP WAN Gateway Location Selection Using Modified K-Dominating Set Algorithm

Author

Frankiewicz, Artur, Glos, Adam, Grochla, Krzysztof, Łaskarzewski, Zbigniew, Miszczak, Jarosław, Połys, Konrad, Sadowski, Przemysław, Strzoda, Anna, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Calzarossa, Maria Carla, editor, Gelenbe, Erol, editor, Grochla, Krysztof, editor, Lent, Ricardo, editor, and Czachórski, Tadeusz, editor

Published
2021
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15. Accuracy of UWB Location Tracking Devices When on the Move

Author

Połys, Konrad, Grochla, Krzysztof, Frankiewicz, Artur, Gorawski, Michał, Barbosa, Simone Diniz Junqueira, Editorial Board Member, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Kotenko, Igor, Editorial Board Member, Yuan, Junsong, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Gaj, Piotr, editor, Sawicki, Michał, editor, and Kwiecień, Andrzej, editor

Published
2019
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16. Simulation Analysis of Packet Delivery Probability in LoRa Networks

Author

Marjasz, Rafał, Grochla, Krzysztof, Strzoda, Anna, Laskarzewski, Zbigniew, Barbosa, Simone Diniz Junqueira, Editorial Board Member, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Kotenko, Igor, Editorial Board Member, Yuan, Junsong, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Gaj, Piotr, editor, Sawicki, Michał, editor, and Kwiecień, Andrzej, editor

Published
2019
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17. An Architectural Framework Proposal for IoT Driven Agriculture

Author

Kuaban, Godlove Suila, Czekalski, Piotr, Molua, Ernest L., Grochla, Krzysztof, Barbosa, Simone Diniz Junqueira, Editorial Board Member, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Kotenko, Igor, Editorial Board Member, Yuan, Junsong, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Gaj, Piotr, editor, Sawicki, Michał, editor, and Kwiecień, Andrzej, editor

Published
2019
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21. LTE Load Balancing with Tx Power Adjustment and the Real Life Mobility Model

Author

Połys, Konrad, Grochla, Krzysztof, Gorawski, Michał, Barbosa, Simone Diniz Junqueira, Series Editor, Chen, Phoebe, Series Editor, Filipe, Joaquim, Series Editor, Kotenko, Igor, Series Editor, Sivalingam, Krishna M., Series Editor, Washio, Takashi, Series Editor, Yuan, Junsong, Series Editor, Zhou, Lizhu, Series Editor, Gaj, Piotr, editor, Sawicki, Michał, editor, Suchacka, Grażyna, editor, and Kwiecień, Andrzej, editor

Published
2018
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23. Global Queue Pruning Method for Efficient Broadcast in Multihop Wireless Networks

Author

Nowak, Sławomir, Nowak, Mateusz, Grochla, Krzysztof, Pecka, Piotr, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Kotenko, Igor, Series editor, Liu, Ting, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Czachórski, Tadeusz, editor, Gelenbe, Erol, editor, Grochla, Krzysztof, editor, and Lent, Ricardo, editor

Published
2016
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24. Assessment of Communication Resource Allocation by the Transmission Control Protocol for the Target Virtual Connection under Competitive Conditions.

Author

Kovtun, Viacheslav, Kovtun, Oksana, Grochla, Krzysztof, and Połys, Konrad

Subjects
TCP/IP, RESOURCE allocation, BANDWIDTH allocation
Abstract

The mathematical framework presented in this article focuses on the controlled-transmission protocol's asynchronous process of bandwidth allocation for the target virtual connection implemented under competition for communication resources. The studied process is formalized as a two-dimensional discrete Markovian chain, taking into account the distributions of queue lengths of TCP data fragments from competing client nodes. Such a chain describes the dynamics of filling the stack of transmitted but unacknowledged data fragments of the investigated end device. Distributions of the chain states were found for various ratios of the target virtual-connection bandwidth, transmission-protocol parameters, and communication-channel characteristics. Analytical dependencies for computing the performance of the target virtual connection for different operating modes were obtained. The results of experiments conducted based on the obtained analytical constructions showed that the performance of the virtual connection with a selective repeat mode is mainly determined by the data-loss intensity, the queue size distribution in transit nodes, and the ratio between the protocol window size and the route length. [ABSTRACT FROM AUTHOR]

Published
2024
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27. Application of Fault-Tolerant GQP Algorithm in Multihop AMI Networks

Author

Nowak, Sławomir, Nowak, Mateusz P., Grochla, Krzysztof, Pecka, Piotr, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Kotenko, Igor, Series editor, Liu, Ting, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Gaj, Piotr, editor, Kwiecień, Andrzej, editor, and Sawicki, Michał, editor

Published
2017
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30. Load Balancing in LTE by Tx Power Adjustment

Author

Grochla, Krzysztof, Połys, Konrad, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Liu, Ting, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Gaj, Piotr, editor, Kwiecień, Andrzej, editor, and Stera, Piotr, editor

Published
2016
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33. Using Kalman Filters on GPS Tracks

Author

Grochla, Krzysztof, Połys, Konrad, Kacprzyk, Janusz, Series editor, Gruca, Aleksandra, editor, Brachman, Agnieszka, editor, Kozielski, Stanisław, editor, and Czachórski, Tadeusz, editor

Published
2016
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41. MAGANET – On the Need of Realistic Topologies for AMI Network Simulations

Author

Nowak, Sławomir, Nowak, Mateusz, Grochla, Krzysztof, Junqueira Barbosa, Simone Diniz, editor, Chen, Phoebe, editor, Cuzzocrea, Alfredo, editor, Du, Xiaoyong, editor, Filipe, Joaquim, editor, Kara, Orhun, editor, Kotenko, Igor, editor, Sivalingam, Krishna M., editor, Ślęzak, Dominik, editor, Washio, Takashi, editor, Yang, Xiaokang, editor, Kwiecień, Andrzej, editor, Gaj, Piotr, editor, and Stera, Piotr, editor

Published
2014
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43. New Trends in Mobility Modelling and Handover Prediction

Author

Barcelo-Arroyo, Francisco, Gorawski, Michał, Grochla, Krzysztof, Martín-Escalona, Israel, Połys, Konrad, Ribeiro, Andrea G., Sofia, Rute, Zola, Enrica, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Ganchev, Ivan, editor, Curado, Marília, editor, and Kassler, Andreas, editor

Published
2014
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44. Resource Management and Cell Planning in LTE Systems

Author

Giambene, Giovanni, Ali Yahiya, Tara, Le, Van Anh, Grochla, Krzysztof, Połys, Konrad, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Ganchev, Ivan, editor, Curado, Marília, editor, and Kassler, Andreas, editor

Published
2014
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