Work

URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity

Year: 2025

Type: article

Abstract: In this work, we analyze the performance of the uplink ultra-reliable and low-latency communications (URLLC) for the low-mobility users (UEs) in a factory environment. The$K$-repetition scheme is a promising approach for improving URLLC reliability, but most studies so far have been carried out assuming fast fading. A UE with low mobility typically experiences a time-correlated slow fading channel. We therefore consider the effects of time correlation in analyzing the performance of a$K$-repetition scheme. On the other hand, multi-connectivity (MC) schemes can overcome such effects and improve reliability through space diversity. We then apply differential modulation to both schemes to support URLLC services, and compare their performance. The simulation results show that such slow fading channels severely decreases the time diversity of a$K$-repetition scheme, and the MC scheme outperforms the$K$-repetition scheme in terms of reliability and transmission latency.

Source: IEEE Open Journal of Vehicular Technology

DOI: 10.1109/ojvt.2025.3569187

Authors: Qingjiao Song, Fu-Chun Zheng, Jingjing Luo

Institution: Harbin Institute of Technology

Language: English

Topic: Advanced Wireless Communication Techniques

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,075