# On Multi-Cell Uplink-Downlink Duality with Treating Inter-Cell Interference as Noise

## TL;DR

This paper establishes a new uplink-downlink duality in cellular networks, characterizes the optimal degrees of freedom region when treating inter-cell interference as noise, and identifies conditions for optimality.

## Contribution

It introduces a novel uplink-downlink duality for Gaussian interfering broadcast channels and characterizes the optimal GDoF region under interference-as-noise assumptions.

## Key findings

- Established a new uplink-downlink duality.
- Characterized an achievable GDoF region with interference as noise.
- Identified conditions for the optimality of this GDoF region.

## Abstract

We consider the information-theoretic optimality of treating inter-cell interference as noise in downlink cellular networks modeled as Gaussian interfering broadcast channels. Establishing a new uplink-downlink duality, we cast the problem in Gaussian interfering broadcast channels to that in Gaussian interfering multiple access channels, and characterize an achievable GDoF region under power control and treating inter-cell interference as (Gaussian) noise. We then identify conditions under which this achievable GDoF region is optimal.