On the Architectural Split and Radio Intelligence Controller Placement in Integrated O-RAN-enabled Non-Terrestrial Networks

TL;DR

This paper explores architectural split options and RIC placement strategies for integrated terrestrial and non-terrestrial networks based on O-RAN principles, analyzing trade-offs and proposing flexible configurations for improved performance and scalability.

Contribution

It introduces a taxonomy of split options and RIC placement strategies tailored for TN-NTN integration, addressing key challenges and interoperability considerations.

Findings

Evaluates various functional split configurations and their impact on latency and performance.

Proposes flexible RIC placement strategies to optimize control loop performance.

Identifies key challenges for standardization and future TN-NTN system development.

Abstract

The integration of Terrestrial Networks (TNs) with Non-Terrestrial Networks (NTNs) poses unique architectural and functional challenges due to heterogeneous propagation conditions, dynamic topologies and limited on-board processing capabilities. This paper examines architectural and functional split strategies that are consistent with O-RAN principles for future integrated TN-NTN systems. A taxonomy of split options is proposed that distributes RAN and core functions between satellites and ground nodes, and trade-offs in terms of performance, latency, autonomy and deployment are analysed. In particular, we evaluate configurations ranging from pure on-board DU deployments to full gNB and UPF integration into satellites, including variations based on intra- and inter-satellite processing. In addition, the placement of Near-RT and Non-RT RAN Intelligent Controllers (RICs) is discussed, proposing flexible split strategies between space and ground to optimise the performance and scalability of the control loop. A comprehensive mapping between architectural splits and RIC placement options is provided, emphasising implementation constraints and interoperability considerations. The paper concludes by identifying key challenges and outlining future directions to enable standardised, modular and efficient TN-NTN convergence in the context of the O-RAN.