Date of Publication :25th April 2023

Abstract: Network densification in the fourth-generation long term evolution (4G LTE) network physical layer to improve capacity and the subsequent deployment of fifth-generation new radio (5G-NR) let to co-channel interference which affects the cell throughput. This co-channel interference is worst at the cell edge. The desire to increase capacity has been the driving force for moving from homogeneous to heterogeneous network infrastructures. This means having the Macro, Micro Pico, and the Femto-layers over-lapping each other at certain geographic space. The uplink power control is geared towards managing interference, improving data rates and by extension result in efficient energy utilization of the limited power source of the user equipment (UE). A lot of researches have sort to address the problem of inter-cell interference using different approaches guided by the frame and standards provided by the third-generation partnership program (3GPP). One of these approaches is the power control which leverages on either uplink or downlink interference mitigation. It focuses in power management, efficient utilization leading to overall energy minimization on the network, while meeting the everyday user data demands. In this review work, a look through works by different scholars, methods employed, schemes proposed and results obtained in uplink power control were carried out. It can be observed that power control plays a critical role in interference mitigation. Yet, much desired results are yet to be achieved, especially at the cell edge of a heterogenous network where resource management is essential.

Reference :