Interference Management with Partial Uplink/Downlink Spectrum Overlap

TL;DR

This paper explores interference management in cellular networks with partial spectrum overlap between uplink and downlink, proposing an optimization scheme to improve overall utility and demonstrate advantages over traditional full and half-duplex systems.

Contribution

It introduces a novel optimization framework for joint power and spectrum overlap control in partial FD systems, enhancing uplink performance and overall network efficiency.

Findings

Proposed scheme outperforms FD and HD schemes in simulations.

Uplink performance is highly sensitive to spectrum overlap and power levels.

Explicit uplink/downlink optimization improves network utility.

Abstract

Simultaneous reuse of spectral resources by uplink and downlink, denoted as in-band full duplex (FD) communication, is promoted to double the spectral efficiency when compared to its half-duplex (HD) counterpart. Interference management, however, remains challenging in FD cellular networks, especially when high disparity between uplink and downlink transmission powers exists. The uplink performance can be particularly deteriorated when operating on channels that are simultaneously occupied with downlink transmission. This paper considers a cellular wireless system with partial spectrum overlap between the downlink and uplink. The performance of the system becomes, therefore, a function of the overlap fraction, as well as the power level of both the uplink and downlink transmissions. The paper considers the problem of maximizing an overall network utility to find the uplink/downlink transmission powers and the spectrum overlap fraction between the uplink and downlink spectrum in each cell, and proposes solving the problem using interior point method. Simulations results confirm the vulnerability of the uplink performance to the FD operation, and show the superiority of the proposed scheme over the FD and HD schemes. The results further show that explicit uplink and downlink performance should be considered for efficient design of cellular networks with overlapping uplink/downlink resources.