Enhanced Throughput and Seamless Handover Solutions for Urban 5G-Vehicle C-Band Integrated Satellite-Terrestrial Networks
Hung Nguyen-Kha, Vu Nguyen Ha, Eva Lagunas, Symeon Chatzinotas, Joel Grotz

TL;DR
This paper proposes advanced algorithms for urban 5G satellite-terrestrial networks to enhance throughput and enable seamless handovers for moving vehicles, addressing urban obstructions and satellite mobility challenges.
Contribution
It introduces a multi-objective optimization framework and iterative algorithms for joint power and association management in urban 5G satellite-terrestrial networks, validated with realistic city data.
Findings
Improved sum-rate performance compared to benchmark algorithms.
Reduced connection change frequency for seamless handovers.
Effective link budget management considering urban obstructions.
Abstract
This paper investigates downlink transmission in 5G Integrated Satellite-Terrestrial Networks (ISTNs) supporting automotive users (UEs) in urban environments, where base stations (BSs) and Low Earth Orbit (LEO) satellites (LSats) cooperate to serve moving UEs over shared C-band frequency carriers. Urban settings, characterized by dense obstructions, together with UE mobility, and the dynamic movement and coverage of LSats pose significant challenges to user association and resource allocation. To address these challenges, we formulate a multi-objective optimization problem designed to improve both throughput and seamless handover (HO). Particularly, the formulated problem balances sum-rate (SR) maximization and connection change (CC) minimization through a weighted trade-off by jointly optimizing power allocation and BS-UE/LSat-UE associations over a given time window. This is a…
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