On Enhancing Reliability in B5G NTNs with Packet Duplication via Multi-Connectivity

TL;DR

This paper introduces a dynamic packet duplication scheme for Non-Terrestrial Networks to improve reliability while reducing redundant packets, addressing the unique challenges of long propagation delays in satellite-based 5G systems.

Contribution

It proposes a hybrid automatic repeat request feedback-based scheme tailored for NTNs, optimizing packet duplication activation for enhanced reliability and efficiency.

Findings

87.2% reduction in duplicated packets

Maintains high reliability with fewer duplicates

Effective in satellite-based NTN scenarios

Abstract

Non-Terrestrial Networks (NTNs) can be used to provide ubiquitous 5G and beyond services to un(der)served areas. To ensure reliable communication in such networks, packet duplication (PD) through multi-connectivity is a promising solution. However, the existing PD schemes developed for terrestrial environments may not be reactive enough for the NTN environment where propagation delays are significantly longer. This paper proposes a dynamic PD activation scheme for NTNs based on hybrid automatic repeat request feedback. The scheme aims to reduce the number of duplicated packets while maintaining high reliability. To evaluate the proposed scheme, simulations are conducted in a scenario with two transparent payload lowearth orbit satellites. The results show a significant reduction of 87.2% in the number of duplicated packets compared to blind duplication, with only marginal compromise in reliability.