Development and study of methods for reliability enhancement of tethered high-altitude unmanned telecommunication platforms


(March 2023 - Feb. 2026)



Published Monograph:

  1. Dharmaraja Selvamuthu, Vladimir M. Vishnevsky, Raina Raj, Vladimir V. Rykov, Nika M. Ivanova, Dmitry V. Kozyrev: Reliability Analysis of High-Altitude Telecommunication Platforms Stochastic, Risk Trees and Simulation Approaches, Springer, 2026. (https://link.springer.com/book/9789819994441)

    About this book

    This book provides a comprehensive exploration of the performance and reliability analysis of high-altitude unmanned platforms, including tethered high-altitude unmanned platforms. It introduces advanced mathematical models, methods, and algorithms that enhance reliability theory and strengthen the theoretical foundations of UAV-based aerial communication networks, essential for 5G, 6G, and future networks. The book presents innovative approaches, including Markov and semi- Markov processes, along with simulation models, to analyze complex systems and compute key reliability and performance metrics.



  2. Vladimir M. Vishnevsky, Dharmaraja Selvamuthu, Vladimir Rykov, Dmitry V. Kozyrev, Nika Ivanova and Achyutha Krishnamoorthy: Reliability Assessment of Tethered High-altitude Unmanned Telecommunication Platforms k-out-of-n Reliability Models and Applications, Springer, 2024. (https://link.springer.com/book/9789819994441)

    About this book

    This book provides a systematic presentation of the major results in the field of the theory of k-out-of-n systems obtained in recent years and their applications for the reliability assessment of high-altitude unmanned platforms. Mathematical models, methods, and algorithms, presented in the book, will make a significant contribution to the development of reliability theory and the theoretical foundations of unmanned UAV-based aerial communications networks in the framework of the concept of creating the 5G and beyond networks. The book gives a description of new mathematical methods and approaches (based on decomposable semi-regenerative processes, simulation and machine learning methods, and inventory models) to the study of the complex k-out-of-n systems, which makes it possible to carry out numerical calculations of reliability indicators. Organized into five chapters, each chapter begins with a summary of the main definitions and results contained in the chapter. The content of this book is based on the original results developed by the authors, many of which appear for the first time in book form.


Published/Accepted Research Journal Publications:

  1. Anupam Gautam, Nika Ivanova, Ishu Jain and S. Dharmaraja: Reliability Analysis of Multiple High Altitude Platform System Using Stochastic Modeling and Machine Learning Techniques, Wireless Personal Communications, 146, 2026, pp. 1521 – 1559. (https://doi.org/10.1007/s11277-026-11932-6) (Q2 in SJR citation index)

  2. Raina Raj, R Sudhesh and S. Dharmaraja: Reliability Analysis and Effect of Propagation Failure on High Altitude Platforms in Wireless Communication, Wireless Personal Communications, Vol. 146, pp. 233 - 278, 2026. (https://doi.org/10.1007/s11277-025-11876-3) (Q2 in SJR citation index)

  3. Anupam Gautam, Ishu Jain: Stochastic Fluid Queue Modelling and its Analysis for Power Saving in High Altitude Platform Station System: An Analytical Approach, OPSEARCH, Volume 63, pages 862–883, 2026. (Q2 in SJR citation index)

  4. Suwalka, Komal, Nika Ivanova, and Vidyottama Jain: Semi-Markov-based analytical framework for efficient and reliable inter-HAPS handoff management in communication networks, To appear in Computer Networks (112316), 2026.

  5. P.S., A., Rangaswamy, M: Reliability optimization of tethered high-altitude platform systems through hysteresis-controlled battery management, To appear in Ann Oper Res, 2026. https://doi.org/10.1007/s10479-026-07370-z

  6. R. Harini and S. Dharmaraja: Stochastic Modeling of Energy Consumption in Tethered High Altitude Platforms with Dynamic Sleep Control, Methodology and Computing in Applied Probability, Vol. 28, article number 103, 44 pages, 2026. (https://doi.org/10.1007/s11009-026-10335-1) (Q2 in SJR citation index)

  7. Akhil Vijayan R, Manikandan Rangaswamy: Assessing the Impact of Replenishment Policies and Repair Mechanisms on Energy Management System Reliability, To appear in Quality and Reliability Engineering International journal, 2026.

  8. K. S. Shiny and Narayanan C. Viswanath: Birth–death processes with temporary birth and/or death halts, To appear in OPSEARCH, 2026. (Q2 in SJR citation index)

  9. Ishu Jain, Anupam Gautam, S. Dharmaraja and Min Xie: Semi-Markov Modelling approach for the Reliability Analysis of Multiple High Altitude Platform Station System, Reliability Engineering and System Safety, Volume 265, Part A, January 2026, 111450 (Q1 in SJR citation index) (https://doi.org/10.1016/j.ress.2025.111450)

  10. Neha Tiwari, Swades De and S Dharmaraja: Analysis of Transmit Diversity Performance over Vertical FSO Channels with Altitude-Dependent Impairments, IEEE Communications Letters, Volume: 29, Issue: 12, December 2025, 2785 - 2789. (https://10.1109/LCOMM.2025.3612863) (Q1 in SJR citation index)

  11. Nisha Mathew, V.C Joshua, A Krishnamoorthy, Ambily P. Mathew: A Production Inventory model with Protection for few Stages of Production, Reliability: Theory and Applications, Vol.20, issue 8(85), 7-29, 2025.

  12. Rasmi K, S Dharmaraja, Raina Raj, Vladimir Vishnevsky and Dmitry Kozyrev: Reliability Analysis of a tHAP Mission with Sequential Phases, Reliability: Theory & Applications, Vol. 89 (Issue 4) (2025), pp. 69-81. (https://doi.org/10.24412/1932-2321-2025-489-69-81)

  13. Akhil Vijayan, Arya P S and Manikandan R: Strategic Maintenance Approaches for Enhanced Reliability in Parallel System, Journal of Indian Society for Probability and Statistics, Volume 26, pages 545–569, 2025.

  14. Raina Raj, S. Dharmaraja, Vladimir Vishnevsky and Dmitry Kozyrev Stochastic Modeling of Dependability Attributes for a Multilayer Satellite-HAP-Terrestrial System, International Journal of Communication Systems, Volume 38, Issue 14, e70211, 19 pages, 2025. (https://doi.org/10.1002/dac.70211) (Q2 in SJR citation index)

  15. Guglielmo D'Amico, Raina Raj and S. Dharmaraja: Reliability Analysis of a K-out-of-N System with Random Rate of Repair, Probability in the Engineering and Informational Sciences, Vol. 39, Issue 3, pages 431–460, 2025. (https://doi.org/10.1017/S0269964824000275) (Q2 in SJR citation index)

  16. Arya P. S, Manikandan R, A. Krishnamoorthy and S. Dharmaraja: Optimizing Battery Maintenance and Reliability in Ground Control Station for Tethered High-Altitude Platforms, ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems Part B: Mechanical Engineering, Vol. 11 (Issue 2): 021102 (17 pages), 2025. ((https://doi.org/10.1115/1.4067545) (Q2 in SJR citation index)

  17. Ishu Jain and Anupam Gautam: Reliability analysis of energy management subsystem in a high altitude platform station using hierarchical stochastic models and machine learning, Journal of Industrial and Management Optimization, Volume 21, Issue 2, pages 1269 - 1299, 2024.

  18. Nikita Mittal, Nika Ivanova, Vidyottama Jain and Vladimir Vishnevsky: Reliability and Availability Analysis of High Altitude Platform Stations through Semi-Markov Modeling, Reliability Engineering & System Safety, 2024, Vol. 252, 110419, 13 pages. (Q1 in SJR citation index)

  19. Achyutha Krishnamoorthy, Anu Nuthan Joshua and Ambily P. Mathew: The k-out-of-n: G System Viewed as a Multi-Server Queue, Mathematics, Vol. 12 (2024), 210, 19 pages. (Q2 in SJR citation index)

  20. Raina Raj and S. Dharmaraja: Stochastic Modelling of Multi-Layer HAP-LEO Systems in 6G for Energy Saving: An Analytical Approach, Computer Communications, Vol. 210 (2023), pp. 23 - 34. (https://doi.org/10.1016/j.comcom.2023.07.037) (Q1 in SJR citation index)

  21. S. Dharmaraja, Adwaith H Sivama, Raina Raja and Vladimir Vishnevsky: Study of reliability of the on-tether subsystem of a tethered high-altitude unmanned telecommunication platform, Reliability: Theory & Applications, Vol. 72 (Issue 1) (2023), pp. 172-178. (https://doi.org/10.24412/1932-2321-2023-172-172-178)



Published/Accepted Research Conference Publications:

  1. S Dharmaraja, Ankit Kumar, Raina Raj, Vladimir Vishnevsky and Dmitry Kozyrev: Maintainability Analysis of a Tethered High Altitude Platform Using an Optimization Approach Under Environmental Constraints , To appear in Proceedings of 2026 IEEE Space, Aerospace and Defence Conference (SPACE), July 19 - 21, 2026, Bangalore, India, 2026.

  2. Raina Raj, Ksenia Zhukova, Ruslana Nekrasova and S. Dharmaraja: Performance Analysis of High-altitute Plateforms using Mutli-server Retrial Queues, To appear in Proceedings of 26th International Conference on Distributed Computer and Communication Networks: Control, Computation, Communications, 22-25 September 2025, Moscow, Russia.

  3. S Dharmaraja, Adwaith H Sivam, Raina Raj, Priyanka Kalita, Dmitry Kozyrev and Vladimir Vishnevsky: Optimizing Tethered HAP Networks Configuration Using Genetic Algorithms, Proceedings of IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS) 15 – 18 December 2024, Assam, India, IIT Guwahati, 2024. (https://doi.org/10.1109/ANTS63515.2024.10898945)

  4. Raina Raj, Dharmaraja Selvamuthu and Deepak Mishra: Traffic Control Analysis in High Altitude Platforms using a Semi-Markov Process Approach, Proceedings of EEE International Conference on Advanced Networks and Telecommunications Systems (ANTS) 15–18 December 2024, Assam, India, IIT Guwahati, 2024. (https://doi.org/10.1109/ANTS63515.2024.10898543)

  5. Raina Raj, Dharmaraja Selvamuthu and Deepak Mishra: Traffic Control and Energy Harvesting in High Altitude Platforms: A Semi-Markov Process Approach, Proceedings of IEEE Global Communications Conference, December 8 - 12, 2024, Cape Town, South Africa, 2024. (https://doi.org/10.1109/GCWkshp64532.2024.11100824)

  6. S Dharmaraja, Rasmi K, Raina Raj, Vladimir Vishnevsky and Dmitry Kozyrev: An Investigation of Phased Mission Reliability Analysis for tethered HAP Systems, Proceedings of 27th International Conference on Distributed Computer and Communication Networks: Control, Computation, Communications, 23 - 27 September 2024, Moscow, Russia, LNCS 15460, pp. 376 - 388, 2025. (https://doi.org/10.1007/978-3-031-80853-1_1)

  7. Arya P S, Manikandan R. Reliability Enhancement of Multi-Cell Battery in Ground Control Station of Tethered HAPS, 2024 International Conference on Communication, Control, and Intelligent Systems (CCIS), Mathura, India, 2024, pp. 1-6.

  8. Neha Tiwari, Swades De and Dharmaraja Selvamuthu: Modeling of Channel Asymmetry in HAP-Based Optical Wireless Communications, Proceedings of NCC, Feb. 20-23, 2023, Guwahati, India. (https://doi.org/10.1109/NCC56989.2023.10068106)

  9. Vladimir Vishnevsky, Dharmaraja Selvamuthu, Vladimir Rykov, Dmitry Kozyrev and Nika Ivanova: Reliability modeling of a flight module of a tethered high-altitude telecommunication platform, Proceedings of International Conference on Information, Control, and Communication Technologies (ICCT), October 3-7, 2022, Astrakhan, Russia, (https://doi.org/10.1109/ICCT56057.2022.9976764)

  10. Dharmaraja Selvamuthu, Vidyottama Jain and Raina Raj: Performance Analysis for Tethered HAP Systems: An Analytical Approach, 25th International Conference on Distributed Computer and Communication Networks: Control, Computation, Communications, 26-30 September 2022, Moscow, Russia. pp. 205 - 217, 2023. (https://doi.org/10.1007/978-3-031-23207-7_16)

  11. Vidyottama Jain, Vladimir Vishnevsky, Dharmaraja Selvamuthu, and Raina Raj: Analysis of Power Management in a Tethered High Altitude Platform using MAP/PH[3]/1 Retrial Queueing Model, 25th International Conference on Distributed Computer and Communication Networks: Control, Computation, Communications, 26-30 September 2022, Moscow, Russia. pp. 218 - 230, 2023. (https://link.springer.com/chapter/10.1007/978-3-031-23207-7_17)

  12. Shiny, K. S., and Narayanan C. Viswanath: Study of Birth-Death Processes with Growth Interruptions Springer Proceedings in Mathematics & Statistics series (Volume 484), International Conference on Mathematics of Intelligent Computing and Data Science, Kochi, Kerala, India, September 15–17, 2022.


Communicated Research Journal Publications:

  1. Harini Rajendran, Ruslana Nekrasova, Ksenia Zhukova and S. Dharmaraja: Performance Analysis of Tethered HAP Communication Systems with Threshold-Based Priority and Retrial Mechanisms, 2026.

  2. Nika Ivanova, Vladimir Vishnevsky and S. Dharmaraja: Risk Tree Methodology for Enhancing Reliability of Tethered High-Altitude Unmanned Platforms, 2025.

  3. Ankit Kumar, S Dharmaraja, Raina Raj and Rasmi K: Reliability Analysis of Tethered UAV System in Varied Environmental Conditions, 2024.

  4. Sebasthi Priya, R Sudhesh, Priyanka Kalita and S. Dharmaraja: Stochastic Modeling and Analysis of Energy Efficiency in Tethered High Altitude Platforms Based Smart Macro Base Station, 2024.

  5. Priyanka Kalita, Vidyottama Jain and S. Dharmaraja: Efficient Energy Management in a Tethered HAP: A Markov Regenerative Model Perspective on Performance Analysis, 2024.

Last updated on Mon Sept 28, 2026