Interference Reduction in Virtual Cell Optimization

TL;DR

This paper presents a resource allocation scheme for virtual cell systems that reduces user rate failures caused by interference, improving guaranteed bit rate satisfaction in mmWave networks.

Contribution

It introduces a novel interference mitigation technique that considers both intra- and inter-virtual cell interference using minimal network information.

Findings

Decreases the number of users with rates below guaranteed thresholds.

Effective in mmWave systems with cooperative decoding.

Outperforms previous optimization methods in reducing unsatisfied users.

Abstract

Virtual cell optimization clusters cells into neighborhoods and performs optimized resource allocation over each neighborhood. In prior works we proposed resource allocation schemes to mitigate the interference caused by transmissions in the same virtual cell. This work aims at mitigating both the interference caused by the transmissions of users in the same virtual cell and the interference between transmissions in different virtual cells. We propose a resource allocation technique that reduces the number of users that cannot achieve their constant guaranteed bit rate, i.e., the "unsatisfied users", in an uplink virtual cell system with cooperative decoding. The proposed scheme requires only the knowledge of the number of users each base station serves and relies on creating the interference graph between base stations at the edges of virtual cells. Allocation of frequency bands to users is based on the number of users each base station would serve in a non cooperative setup. We evaluate the performance of our scheme for a mmWave system. Our numerical results show that our scheme decreases the number of users in the system whose rate falls below the guaranteed rate, set to $128$kbps, $256$kbps or $512$kbps, when compared with our previously proposed optimization methods.