# On the Resource Utilization of Multi-Connectivity Transmission for URLLC Services in 5G New Radio

## TL;DR

This paper analytically evaluates the outage probability improvements of multi-connectivity with packet duplication in 5G NR for URLLC, highlighting significant reliability gains at the cost of increased resource consumption.

## Contribution

It provides an analytical comparison of multi-connectivity versus single-connectivity in 5G NR, quantifying outage improvements and resource costs for URLLC services.

## Key findings

- Multi-connectivity reduces outage probability by over an order of magnitude.
- It nearly doubles the resource usage compared to single-connectivity.
- Selective use of multi-connectivity can optimize reliability and resource efficiency.

## Abstract

Multi-connectivity with packet duplication, where the same data packet is duplicated and transmitted from multiple transmitters, is proposed in 5G New Radio as a reliability enhancement feature. This paper presents an analytical study of the outage probability enhancement with multi-connectivity, and analyses its cost in terms of resource usage. The performance analysis is further compared against conventional single-connectivity transmission. Our analysis shows that, for transmission with a given block error rate target, multi-connectivity results in more than an order of magnitude outage probability improvement over the baseline single-connectivity scheme. However, such gains are achieved at the cost of almost doubling the amount of radio resources used. Multi-connectivity should thus be selectively used such that its benefits can be harnessed for critical users, while the price to pay in terms of resource utilization is simultaneously minimized.