Eva Lagunas

Beam Scheduling and Multi-Scenario Initial Access Evaluation for 5G NR Non-Terrestrial Networks

This paper presents an integrated framework for beam scheduling optimization and initial access evaluation in 5G new radio (NR) non-terrestrial networks (NTN). A mixed integer linear program (MILP) is formulated to minimize the synchronization signal block (SSB) sweep period while enforcing full cell coverage, hardware...

Hybrid Optimization-Learning for Interference Management in Coexisting NTN–TN Systems

Spectrum sharing between non-terrestrial networks (NTNs) and terrestrial networks (TNs) represents a key enabler for enhancing spectrum utilization in next-generation wireless systems. However, such coexistence introduces severe crossnetwork interference. Power control is an effective mechanism to mitigate this interfe...

Predictive Routing for NB-IoT Uplink Traffic over a Very Low Earth Orbit (VLEO) Satellite Constellation

Very low Earth orbit (VLEO) satellite constellations are a promising platform for uplink-dominated narrowband internet of things (NB-IoT) services. However, rapid topology variations and short satellite-gateway and satellite-user contact durations introduce significant routing challenges. This paper proposes a predicti...

Cost-Effective Antenna Terminals for Direct-to-Vehicle Satellite Communications

Impact of Out-of-Band Emissions From Active Antenna Systems on LEO Satellite Downlink Coexistence in the C-Band

The coexistence between terrestrial 5G networks and low Earth orbit (LEO) satellite systems in the C-band has raised increasing concerns due to the aggregated impact of out-of-band emissions (OOBE) from active antenna systems (AAS). This paper investigates the interference generated by terrestrial 5G downlink transmiss...

Terahertz Inter-Satellite Links: Motivation, Challenges and Opportunities

Inter-satellite links (ISLs) are essential to the evolution of next-generation satellite constellations, providing the foundation for low-latency, resilient, and globally scalable connectivity. While low radio-frequency (RF)-based ISLs offer technological maturity, they are increasingly constrained by spectrum scarcity...

Transmissive RIS-Assisted Vehicular Direct-to-Satellite Communications: Opportunities, Limitations, and Comparison with Phased Arrays

This article studies transmissive reconfigurable intelligent surface (RIS)-assisted architectures. It compares them with electronically steered phased arrays for the deployment of vehicular direct-to-satellite (D2S) communications in future satellite networks. Rather than treating RIS as a direct replacement for phased...