Inter-Numerology Interference Analysis for 5G and Beyond

TL;DR

This paper analyzes inter-numerology interference in 5G systems, identifying key factors like subcarrier spacing and guard bands that influence interference levels, to improve system design and performance.

Contribution

It provides a comprehensive explanation of INI causes and identifies factors affecting interference in multi-numerology 5G systems, aiding future system optimization.

Findings

Identifies primary causes of inter-numerology interference.

Describes how subcarrier spacing and guard bands affect INI.

Analyzes impact of power offset and windowing on interference.

Abstract

One of the defining characteristics of 5G is the flexibility it offers for supporting different services and communication scenarios. For this purpose, usage of multiple numerologies has been proposed by the 3rd Generation Partnership Project (3GPP). The flexibility provided by multi-numerology system comes at the cost of additional interference, known as inter-numerology interference (INI). This paper comprehensively explains the primary cause of INI, and then identifies and describes the factors affecting the amount of INI experienced by each numerology in the system. These factors include subcarrier spacing, number of used subcarriers, power offset, windowing operations and guard bands.