Internet of Things Group

Our team specializes in Internet of Things (IoT) research, with emphasis on wireless communication and network protocols. We design and analyze the performance of network protocols, address issues related to interoperability, and the semantic description of data and operation of IoT systems. In addition, we investigate auto-configuration, energy consumption minimization, and localization in embedded devices.

We specialize in:

-LP WAN networks, participating in the works of the LoRa Alliance (including the Relay / D2D Task Force);
-Indoor localization using UWB and BLE AoA.

We also work on applying artificial intelligence and machine learning to analyze data generated by IoT devices to assist in detecting anomalies such as water leaks or device failures. In cooperation with the industry, we have developed algorithms to increase the accuracy of UWB and BLE indoor localization systems, analyzed measurements from large LoRa networks to identify problem sources, and developed tools for automatic network reconfiguration in response to a failure and to assist in network design.

We have extensive experience working with various technologies and platforms. We specialize in the design and implementation of systems based on technologies such as LoRa, LTE, WiFi, and heterogeneous networks. In our projects, we also work with mesh networks, which are becoming increasingly popular in the IoT world, due to their ability to self-regulate, scalability, and reliability.

We have completed the following projects:

Group leader:

Krzysztof Grochla, DSc

Group members:

Konrad Połys, PhD
Michał Gorawski, PhD
Rafał Marjasz, PhD
Anna Strzoda, MSc
Mohammed Nasereddin, MSc.
Yuting Ma, MSc
Prof. Viacheslav Kovtun
Zbigniew Laskarzewski
Artur Frankiewicz

Strzoda A, Grochla K, Głomb P, Madej A. 2023. Link failure prediction in LoRa networks. International Wireless Communications and Mobile Computing Conference, IWCMC.

Nowak S, Grochla K, Słabicki M, Gorawski M. 2023. Efficient Universal Indoor Multicharacteristic Propagation model for indoor environments. 2023 International Wireless Communications and Mobile Computing (IWCMC). :1052-1058.

Kovtun V, Grochla K, Połys K. 2023. Investigation of the Information Interaction of the Sensor Network end IoT Device and the Hub at the Transport Protocol Level. MDPI Electronics. 12(22)

Kovtun V, Zaitseva E, Levashenko V, Grochla K, Kovtun O. 2023. Small Stochastic Data Compactification Concept Justified in the Entropy Basis. Entropy. 25(12)

Kovtun V, Grochla K, Kempa W, Połys K. 2023. Reliably Controlling Massive Traffic between a Sensor Network End Internet of Things Device Environment and a Hub Using Transmission Control Protocol Mechanisms. MDPI Electronics. 12(24)

Kovtun V, Grochla K, Altameem T, Al-Maitah M. 2023. Evaluation of the QoS policy model of an ordinary 5G smart city cluster with predominant URLLC and eMBB traffic. PLOS ONE.

Kovtun V, Grochla K, Kharchenko V, Haq MAnul, Semenov A. 2023. Stochastic forecasting of variable small data as a basis for analyzing an early stage of a cyber epidemic. Scientific Reports. 13

2022

Grochla K, Strzoda A, Marjasz R, Głomb P, Książek K, Łaskarzewski Z. 2022. Energy-Aware Algorithm for Assignment of Relays in LPWAN. Transactions on Sensor Networks. 18(4)

Strzoda A, Grochla K, Frankiewicz A, Łaskarzewski Z. 2022. Measurements and Analysis of Large Scale LoRa Network Efficiency. International Wireless Communications and Mobile Computing Conference, IWCMC .

Strzoda A, Grochla K, Połys K. 2022. Variability of BLE Advertisement Packets Received Signal Strength and Delivery Probability in the Presence of Interferences. ACM MSWIM 22 - The 25th International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems, DIVANET Symposium.

Strzoda A, Marjasz R, Grochla K. 2022. How Accurate is LoRa Positioning in Realistic Conditions? ACM MSWIM 22 - The 25th International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems, DIVANET Symposium.

Strzoda A, Marjasz R, Grochla K. 2022. LoRa Positioning in Verification of Location Data's Credibility. Symposium on Modelling, Analysis, and Simulation of Computer and Telecommunication Systems.

Yegin A, Seller O, Orifiamma D, Yu X, Thanh BMai, Barthel D, Buffard C, Carrion I, Ferreira L, Grochla K et al.. 2022. LoRaWAN® Relay Specification TS011-1.0.0.

2021

Gorawski M, Grochla K, Marjasz R, Frankiewicz A. 2021. Energy Minimization Algorithm for Estimation of Clock Skew and Reception Window Selection in Wireless Networks. Sensors. 21

Książek K, Grochla K. 2021. Flexibility Analysis of Adaptive Data Rate Algorithm in LoRa Networks. IEEE IWCMC 2021 - 17th Int. Wireless Communications & Mobile Computing Conference.

Marjasz R, Strzoda A, Połys K, Grochla K. 2021. Mitigation of LoRa interferences via dynamic channel weights. European Simulation and Modelling Conference (formelly European Simulation Multiconference) - ESM . :150-154.

Marjasz R, Połys K, Strzoda A, Grochla K. 2021. Improving Delivery Ratio in LoRa Network. Proceedings of the 19th ACM International Symposium on Mobility Management and Wireless Access.

Marek D, Grochla K, Duda J. 2021. Channel State Information Variability in BLE Positioning Measurements. International Conference On Systems Engineering.

Byrski A, Czachórski T, Gelenbe E, Grochla K, Murayama Y. 2021. Computer Science Protecting Human Society Against Epidemics. ANTICOVID 2021. 616:125.

2020

Gorawski M, Grochla K. 2020. Performance Tests of Smart City IoT Data Repositories for Universal Linear Infrastructure Data and Graph Databases. SN Computer Science. 1:31.

Grochla K, Połys K. 2020. Heuristic Algorithm for Gateway Location Selection in Large Scale LoRa Networks. ACM International Wireless Communications and Mobile Computing Conference.

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Frankiewicz A, Glos A, Grochla K, Łaskarzewski Z, Miszczak J, Połys K, Sadowski P, Strzoda A. 2020. LP WAN Gateway Location Selection Using Modified K-Dominating Set Algorithm. Symposium on Modelling, Analysis, and Simulation of Computer and Telecommunication Systems.

2019

Połys K, Grochla K, Gorawski M, Frankiewicz A. 2019. Accuracy of UWB Location Tracking Devices When on the Move. International Conference on Computer Networks. International Conference on Computer Networks:233-241.

Książek K, Grochla K. 2019. Aggregation of GPS, WLAN, and BLE Localization Measurements for Mobile Devices in Simulated Environments. Sensors. 19

Marjasz R, Grochla K, Strzoda A, Łaskarzewski Z. 2019. Simulation Analysis of Packet Delivery Probability in LoRa Networks.. Communications in Computer and Information Science. 1039

Suila GKuaban, Czekalski P, Molua EL, Grochla K. 2019. An Architectural Framework Proposal for IoT Driven Agriculture. International Conference on Computer Networks.

Grochla K, Słabicki M. 2019. Transmit power optimization in cellular networks with nomadic base stations. IET Communications. 13(18)

Czachórski T, Grochla K. 2019. Diffusion Approximation Models for Cloud Computations with Task Migrations. 2019 IEEE International Conference on Fog Computing (ICFC).

Grochla K, Marjasz R, Połys K, Strzoda A. 2019. Kolizje pakietów w sieciach LoRa w zastosowaniach smart city. Przegląd Telekomunikacyjny+ Wiadomości Telekomunikacyjne.

Gorawski M, Grochla K. 2019. "Graph Representation of Linear Infrastructure in Smart City IoT Systems. 11th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT) .

Kuaban GSuila, Molua EL, Czekalski P, Grochla K. 2019. An Architectural Framework Proposal for IoT Driven Agriculture. Computer Network 2019.

2018

Połys K, Grochla K, Gorawski M. 2018. LTE Load Balancing with Tx Power Adjustment and the Real Life Mobility Model. Computer Networks.

Akinwande OJ, Gelenbe E. 2018. A Reinforcement Learning Approach to Adaptive Forwarding in Named Data Networking. Computer and Information Sciences - 32nd International Symposium, ISCIS 2018, Held at the 24th IFIP World Computer Congress, WCC 2018, Poznan, Poland, September 20-21, 2018, Proceedings.

[Anonymous]. 2018. Computer and Information Sciences - 32nd International Symposium, ISCIS 2018, Held at the 24th IFIP World Computer Congress, WCC 2018, Poznan, Poland, September 20-21, 2018, Proceedings. Communications in Computer and Information Science. 935

2017

Połys K, Grochla K. 2017. Model zmienności przepływności bitowej transmisji w sieciach LTE oparty o łańcuchy Markowa. Krajowe Sympozjum Telekomunikacji i Teleinformatyki .

Nowak S, Nowak M, Grochla K, Pecka P. 2017. Application of Fault-Tolerant GQP Algorithm in Multihop AMI Networks. Computer Networks. CN 2017. Communications in Computer and Information Science, vol 718. :70-80.

Grochla K, Nowak M, Pecka P, Nowak S. 2017. Influence of message-oriented middleware on performance of network management system: a modelling study.. Multimedia and Network Information Systems. . Advances in Intelligent Systems and Computing, Vol. 506:379-393.

Gorawski M. 2017. Load Balancing and Processing Data From Internet of Things Smart Devices. Studia Informatica. 38:5-18.

2016

Grochla K, Połys K. 2016. Using Kalman Filters on GPS Tracks. Man–Machine Interactions 4. :663–672.

Grochla K, Połys K. 2016. Subcarrier Allocation for LTE Soft Frequency Reuse Based on Graph Colouring. Information Sciences and Systems 2015. :447–454.

Grochla K, Połys K. 2016. Analiza wpływu mocy nadawania stacji bazowych na mechanizmy równoważenia obciążenia w sieciach LTE. Materiały konferencyjne Krajowego Sympozjum Telekomunikacji i Teleinformatyki.

Nowak S, Nowak M, Grochla K, Pecka P. 2016. Global Queue Pruning Method for Efficient Broadcast in Multihop Wireless Networks. Computer and Information Sciences: 31st International Symposium, ISCIS 2016, Kraków, Poland, October 27–28, 2016, Proceedings. :214–224.

Nowak S, Nowak M, Grochla K, Pecka P. 2016. Efektywne rozgłaszanie w wielohopowej sieci bezprzewodowej. Effective Broadcasts in Multihop Wireless Network. Przegląd Telekomunikacyjny - Wiadomości Telekomunikacyjne. (8-9):887-891.

Słabicki M, Grochla K. 2016. Influence of the Management Protocols on the LTE Self-configuration Procedures’ Performance. Information Sciences and Systems 2015. :439–446.

Słabicki M, Grochla K. 2016. Performance evaluation of CoAP, SNMP and NETCONF protocols in fog computing architecture. NOMS 2016 - 2016 IEEE/IFIP Network Operations and Management Symposium.

Masek P., Słabicki M, Hosek J., Grochla K. 2016. Transmission Power Optimization in Live 3GPP LTE-A Indoor Deployment. Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), 2016 8th International Congress on.

Słabicki M, Grochla K. 2016. PyLTEs – Python LTE Evaluation Framework for Quick and Reliable Network Optimization. 39th International Conference on Telecommunications and Signal Processing (TSP).

Czachórski T, Gelenbe E, Grochla K, Lent R. 2016. Computer and Information Sciences ISCIS 2016. Communications in computer Information Science. 659:500.

2015

Grochla K, Połys K. 2015. Dobór parametrów mechanizmu zwielokrotnienia wykorzystania częstotliwości SFR w sieciach LTE. Materiały konferencyjne Krajowego Sympozjum Telekomunikacji i Teleinformatyki.

Grochla K, Gorawski M, Połys K. 2015. Comparison of Measurements and Simulation Model of Indoor Signal Level Variation in LTE Networks. Proceedings of the 8th International Conference on Simulation Tools and Techniques.

Gorawski M, Grochla K, Połys K. 2015. Variability of LTE Signal in Indoor Environment. Internet in the Information Society, X Scientific Conference.

Słabicki M, Grochla K. 2015. Performance evaluation of snmp, netconf and cwmp management protocols in wireless network. Electronics, Communications and Networks IV: Proceedings of the 4th International Conference on Electronics, Communications and Networks (CECNET IV), Beijing, China, 12–15 December 2014.

Słabicki M, Grochla K. 2015. Local approach to power management in LTE networks. Telecommunications and Signal Processing (TSP), 2015 38th International Conference on.

Masek P, Hosek J, Zakaria Y, Uhlir D, Novotny V, Słabicki M, Grochla K. 2015. Experimental evaluation of RAN modelling in indoor LTE deployment. Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), 2015 7th International Congress on.

Gorawski M, Skrzewsk M, Gorawski M, Gorawska A. 2015. Neural networks in petrol station objects calibration. International Conference on Algorithms and Architectures for Parallel Processing. :714-723.

Foremski P, Grochla K. 2015. LTE or WiFi? Client-Side Internet link selection for smartphones. Computer Networks. :43–53.

Połys K, Grochla K. 2015. Mobility robustness in LTE based on automatic neighbor relation table.. Computer Networks. :232–241.

Foremski P, Gorawski M, Grochla K, Połys K. 2015. Energy-Efficient Crowdsensing of Human Mobility and Signal Levels in Cellular Networks. Sensors. 15

Grochla K, Foremski P. 2015. Demo: Wireless Link Selection on Smartphone: Throughput vs Battery Drain. MobiCom '15 Proceedings of the 21st Annual International Conference on Mobile Computing and Networking. :190–192.

2014

Barcelo-Arroyo F, Gorawski M, Grochla K, Martín-Escalona I, Połys K, Ribeiro AG, Sofia R, Zola E. 2014. New Trends in Mobility Modelling and Handover Prediction. Wireless Networking for Moving Objects. :88–114.

Giambene G, Yahiya TAli, Le VAnh, Grochla K, Połys K. 2014. Resource Management and Cell Planning in LTE Systems. Wireless Networking for Moving Objects. :177–197.

Grochla K, Połys K. 2014. Simplied model of wireless network throughput changes resulting from client mobility. Proceedings of SIMUTools 2014.

Nowak S, Nowak M, Grochla K. 2014. Properties of advanced metering infrastructure networks' topologies. 2014 IEEE Network Operations and Management Symposium (NOMS).

Słabicki M, Grochla K. 2014. The automatic configuration of transmit power in LTE networks based on throughput estimation. 2014 IEEE 33rd International Performance Computing and Communications Conference (IPCCC).

Gorawski M, Grochla K. 2014. Review of mobility models for performance evaluation of wireless networks. Advance in Intelligent Systems and Computing. 242:567–577.

Atmaca T., Czachórski T, Grochla K, Nycz T., Pekergin F. 2014. A model of boot-up storm dynamics. Computer and Information Sciences III. :371–379.

Foremski P, Gorawski M, Grochla K. 2014. Source Model of TCP Traffic in LTE Networks. Information Sciences and Systems 2014.

Nowak S, Nowak M, Grochla K. 2014. MAGANET - On the need of realistic topologies for AMI network simulations. Computer Networks. :79–88.

2013

Grochla K, Połys K. 2013. Influence of the Handoff Threshold Hysteresis on Heterogeneous Wireless Network Performance. Proceedings of 7th International Working Conference HET-NETs.

Gorawski M, Grochla K. 2013. The Real-Life Mobility Model: RLMM.

Gorawski M, Lis D, Gorawski M. 2013. The use of a Cloud Computing and the CUDA architecture in zero-latency Data Warehouses Computer Networks. Communications in Computer and Information Science. :312–322.

Gorawski M, Marks P, Gorawski M. 2013. Modeling Data Stream Intensity in Distributed Stream Processing System, Computer Networks. Communications in Computer and Information Science Volume. :372–383.

Gorawski M, Gorawski M, Dyduch S. 2013. Use of grammars and machine learning in ETL systems that control load balancing process. 15th IEEE International Conference on High Performance Computing and Communications. HPCC 2013. :1709–1714.

Gorawski M. 2013. Intelligent Information Systems, Knowledge Discovery, Big Data and High Performance Computing. Information Systems Architecture and Technology.

2012

Czachórski T, Grochla K, Józefiok A, Nycz T, Pekergin F. 2012. Performance Evaluation of a Multiuser Interactive Networking System: A Comparison of Modelling Methods. Computer and Information Sciences II. :215–222.

Grochla K. 2012. Simulation analysis of a virtualization system performance in Boot Up Scenario. International Conference on Networking and Future Internet. :21–24.

Czachórski T, Grochla K, Nycz T., Pekergin F. 2012. Duration of boot-up storm period. 17th Polish teletraffic symposium. :145–150.

2011

Grochla K, Czachórski T, Klamka J. 2011. Numerical Model of Tcp in 802.16 Networks Using Fluid Flow Approximation. First International Conference on Networking and Future Internet 2011 (ICNFI 2011).

Czachórski T, Grochla K, Józefiok A, Nycz T. 2011. Simulation, Markov Chain and Diffusion Approximation Models – a Case Study. “Computer Science & Information Technologies” (CSIT’2011).

Czachórski T, Grochla K, Józefiok A, Nycz T. 2011. Porównanie metod analizy efektywności na przykładzie serwera aplikacji w sieci lokalnej. Studia Informatica. 32:7–20.

Nowak M, Nowak S, Pecka P, Grochla K. 2011. Content Identification in PI CAN Network. Computer Networks. :164–172.

Klamka J, Czachórski T, Grochla K. 2011. Modelling TCP Connection in WIMAX Network Using Fluid Flow Approximation.. Applications and the Internet. :502–507.

2010

Czachórski T, Grochla K, Nycz T., Pekergin F. 2010. A diffusion approximation model for wireless networks based on IEEE 802.11 standard, Computer Communication Journal. Computer Communication Journal. 33:S86–S92.

Czachórski T, Grochla K, Nycz T., Pekergin F. 2010. Modeling the IEEE 802.11 Networks MAC Layer Using Diffusion Approximation. Proceeding of HET-NETs 2010. :429–442.

Józefiok A, Czachórski T, Grochla K. 2010. Performance evaluation of multiuser interactive networking system. Proceedings of 6th International Conference HET-NETs 2010. :223–231.

2009

Grochla K, Sochan A. 2009. Adaptive Streaming of Stereographic Video. Computer Networks – Communications in Computer and Information Science, Springer. 39:87–94.

Nowak S, Domańska J, Grochla K. 2009. Symulator zdarzeń dyskretnych OMNeT++v.3.3.

2008

Grochla K. 2008. Simulation Comparison of Active Queue Management Algorithms in TCP/IP Networks. Journal of Telecommunication Systems. 39

Grochla K, Sochan A, Głomb P. 2008. Transmission of scalable video streams. Proceedings from the 4th Euro-NGI Workshop on New trends in network architectures and services.

Czachórski T, Grochla K, Pekergin F. 2008. Un modele d’approximation de diffusion pour la distribution du temps d’acheminement des paquets dans les réseaux de senseurs. Colloque francophone sur l’ingénierie des protocoles.

Czachórski T, Grochla K, Pekergin F. 2008. Estimation of packet transfer time at sensor networks, diffusion approximation approach. Proceedings from HET-NETs.

Czachórski T, Grochla K, Pekergin F. 2008. TCP performance for a wireless traffic, a diffusion approxiation model. Proceedings from Workshop on Wireless and mobility in Future Generation Internet.

2007

Grochla K. 2007. The Analysis Of Traffic Shaping In Tcp Connection In Laboratory Network. Proceedings from ISAT Conference.

Busic A., Czachórski T, Fourneau J.M, Grochla K. 2007. Level Crossing Ordering of Markov Chains: Proving Convergence and Bounding End to End Delays in an All Optical Network. ACM Proceedings from Valuetools 2007.

Grochla K, Czachórski T, Busic A., Fourneau J.M. 2007. Simulation Analysis of Deflection Routing in Hypercube. Proceedings from Polish Teletraffic Symposium.

Czachórski T, Grochla K, Pekergin F. 2007. Fluid-flow Approximation Model of TCP-NCR in wired-wireless networks. Proceedings from Polish Teletraffic Symposium.

Brachman A., Czachórski T, Grochla K. 2007. Analiza wydajności protokołu TCP-NCR w sieciach bezprzewodowych. Materiały Konferencji Sieci Komputerowe.

Grochla K. 2007. Simulation Analysis of Active Queue Management Algorithms in IP Networks. Proceedings from Fourth EuroFGI Workshop on "New Trends in Modelling, Quantitative Methods and Measurements".

Czachórski T, Grochla K, Pekergin F. 2007. Stability and Dynamics of TCP-NCR(DCR) Protocol. Lecture Notes in Computer Systems 4396 - Wireless Systems and Mobility in Next Generation Internet. :241–254.

2006

Głomb P, Grochla K. 2006. Representing single-link traffic quality with kernel PCA.

Czachórski T, Grochla K, Pekergin F. 2006. A model of TCP flows dynamics. Theoretical and Applied Informatics. 18:279–292.

Czachórski T, Grochla K, Pekergin F. 2006. Some contributions to the modelling the dynamics of (TCP,UDP)/RED flows over reliable and unreliable connections. Proceedings from HET-NETs 2006.

Grochla K, Pecka P. 2006. The Markov chain model of RED active queuing management algorithm. Proceedings from HET-NETs 2006.

Domańska J, Grochla K, Czachórski T, Atmaca T.. 2006. Nowe Technologie Sieci Komputerowych. 1

Grochla K, Pecka P. 2006. Analiza wydajności mechanizmu RED za pomocą łańcuchów Markowa z czasem ciągłym. Materiały Konferencji Sieci Komputerowe.

Czachórski T, Domańska J, Grochla K. 2006. Dynamics of TCP/IP flows in presence of various AQM algorithms, a fluid flow approximation model. Third EuroNGI Workshop on New Trends in Modelling, Quantitative methods and Measurements.

Czachórski T, Domańska J, Grochla K. 2006. TCP/IP dynamics in wireless environment, a fluid-flow model. Third Workshop on Wireless and Mobility.

2005

Głomb P, Grochla K. 2005. Modeling Connection State with Kernel PCA. 2nd EuroNGI Workshop on New Trends in Modeling, Quantitative Methods and Measurements.

Grochla K. 2005. Nowe technologie w komputerowych systemach zarządzania.

Grochla K, Fourneau J.M. 2005. Simulation Analysis of Eulerian Routing with Shortcuts in All-optical networks. materiały konferencji: Second EuroNGI Workshop on.