Latest Events
Research Seminar by Dr. Raina Raj, on 8 August 2025, at 12:00 PM
Title of the talk: Performance Analysis of High Altitude Platforms using Stochastic Modelling
Date , Time & Venue: 8 August 2025, 12:00 PM, Seminar Hall, Dept. of Mathematics
Abstract: In the current era of communication systems, the next-generation technology known as sixth generation (6G) is anticipated to extensively utilize space-air-terrestrial networks (SAT). High altitude platforms (HAPs) and low earth orbit (LEO) satellites are essential components of the SAT network. The presented study proposes an architecture which concentrates on energy saving of HAP in the SAT network. Further, a stochastic model has been proposed which considers three energy saving states of HAP; power saving, standby, and sleep states. It has been assumed that in these states, the energy consumption of HAP is very low or zero. Whenever, there is an arrival of a packet in the system, HAP will start providing service immediately and the whole system will be in active state. The analysis of the stochastic model has been carried out using the Markov process (MP) and semi-Markov process (SMP). The system has been analysed in steady-state for both the MP and SMP to obtain the steady-state probabilities. Through the numerical results, the effective contribution of energy saving states in enhancing the energy saving of HAP systems has been provided and a comparison for the MP and SMP case has been described in detail. To verify the accuracy of the presented model, a discrete-event simulation approach is employed.
About the Speaker: Dr. Raina Raj received the Ph.D. degree in stochastic modelling of cellular networks with optimization methods from Central University of Rajasthan, Ajmer, India, in February 2023. Since August 2022, she has worked as a Research Associate with Prof S Dharmaraja in the Department of Mathematics, IIT Delhi. From November 2023 onwards, she has been working as an Institute Post Doc Fellow in Bharti School of Telecommunication Technology & Management, IIT Delhi. Her research interests include stochastic modeling of wireless communication systems.
