# Interference Mitigation for Ultrareliable Low-Latency Wireless Communication

## TL;DR

This paper introduces interference mitigation strategies for ultrareliable low-latency wireless industrial communication, enhancing the Occupy CoW protocol by enabling full frequency reuse and interference cancellation to reduce bandwidth and power needs.

## Contribution

It proposes two novel protocols that incorporate interference cancellation or avoidance, significantly improving scalability and efficiency over existing methods.

## Key findings

- Both protocols outperform Occupy CoW in bandwidth efficiency.
- Interference cancellation reduces power requirements.
- Full frequency reuse enhances scalability in dense networks.

## Abstract

This paper proposes interference mitigation techniques for provisioning ultrareliable low-latency wireless communication in an industrial automation setting, where multiple transmissions from controllers to actuators interfere with each other. Channel fading and interference are key impairments in wireless communication. This paper leverages the recently proposed ``Occupy CoW'' protocol that efficiently exploits the broadcast opportunity and spatial diversity through a two-hop cooperative communication strategy among distributed receivers to combat deep fading, but points out that because this protocol avoids interference by frequency division orthogonal transmission, it is not scalable in terms of bandwidth required for achieving ultrareliability, when multiple controllers simultaneously communicate with multiple actuators (akin to the downlink of a multicell network). The main observation of this paper is that full frequency reuse in the first phase, together with successive decoding and cancellation of interference, can improve the performance of this strategy notably. We propose two protocols depending on whether interference cancellation or avoidance is implemented in the second phase, and show that both outperform Occupy CoW in terms of the required bandwidth and power for achieving ultrareliability at practical values of the transmit power.