Performance Analysis of Ultra-Reliable Short Message Decode and Forward Relaying Protocols

TL;DR

This paper evaluates the performance of various cooperative relaying protocols for ultra-reliable low-latency communication in machine-type networks, focusing on outage probability, energy efficiency, and the impact of coding and power allocation.

Contribution

It provides a comparative analysis of dual-hop DF, SC, and MRC relaying schemes under different power constraints for URLLC, including their effects on latency and energy efficiency.

Findings

MRC outperforms other schemes in reliability.

Power allocation significantly reduces outage probability.

Coding rate impacts success probability in ultra-reliable regimes.

Abstract

Machine-Type Communication (MTC) is a rapidly growing technology which covers a broad range of automated applications and propels the world into a fully connected society. Two new use cases of MTC are mMTC and URLLC, where mMTC support a large number of devices with high reliability and low rate connectivity while URLLC refers to excessively low outage probability under very stringent latency constraint. Herein, we examine the URLLC through three cooperative schemes, namely dual-hop DF, SC and MRC, and compare to direct transmission under Rayleigh fading. We compare the performance of studied cooperative protocols under two distinct power constraints with respect to latency and energy efficiency. Moreover, we illustrate the impact of coding rate on the probability of successful transmission in ultra-reliable region in addition to the effect of power allocation on the outage probability. We also provide the performance analysis of cooperative schemes in terms of energy efficiency and latency requirements.