Energy Efficiency Analysis of Power Allocation on D-MIMO with Dynamic TDD

Distributed multi-input multi-output (D-MIMO) has been proposed for the 6th generation (6G) of mobile communications to provide more uniform networks by connecting each user equipment (UE) to more than one access point (AP) through the same bandwidth resource. To meet the individual traffic demands of each UE in a D-MIMO setup, the use of dynamic time division duplex (D-TDD) has also been considered in the literature, by setting the configuration of the system frame in a user-centric way and considering the user necessity at a given moment, differently from static time division duplex (S-TDD). However, this dynamic approach introduces cross-link interference (CLI) due to the simultaneous coexistence of UEs in uplink (UL) and downlink (DL) in a same network. To deal with CLI and energy efficiency (EE) aspects, this work analyzes a classic power allocation algorithm, known as UL fractional power control (FPC), in the case of D-MIMO systems with D-TDD. The results are presented in terms of the spectral efficiency (SE) and EE performance under such scenarios, indicating that the use of FPC can contribute to implement sustainable networks.