Location-Aware Spatial Selection with Beam Shape and Width Control in 5G mm Wave UDN

Ultra-massive MIMO with up to thousands of antenna elements in millimeter wave (mmWave) and THz frequency bands, termed as gigantic MIMO, is envisioned as a key enabler for Beyond 5G (B5G) and 6G wireless Ultra-Dense Networks (UDN). The potential of such huge Antenna Arrays (AA) at gNodeB (gNB) allows to form simultaneously several extremely narrow beams, oriented to each User Equipment (UE), and realize their spatial selection. Harnessing this approach in conjunction with Location-Aware Beamforming (LAB), being intrinsic feature of B5G, promises unprecedented level of transceivers densification. The main challenge, which have not yet been thoroughly investigated, is the relationship between the required Antenna Radiation Pattern (ARP) and the UE location accuracy. The contribution of current research is scientific justification of beam shape and Half Power Beam Width (HPBW) control approaches for spatial selection, dependent on AA size and LAB accuracy, characterized by Root Mean Square Error (RMSE) of the UE coordinate estimate. Matlab code for spatial selection model is available at https://github.com/grihafokin/LAB_spatial_selection.