1. A method of managing interference and handover in a broadband, UAV-assisted heterogeneous network (BAHN), the method comprising: determining a candidate BAHN model from state data received from base station devices of the BAHN, wherein the candidate BAHN model satisfies one or more factors including an interference metric, a load-balancing metric, a handover failure metric, a ping-pong probability metric, and a network throughput metric, wherein the base station devices include one or more of unmanned aerial base station (UABS) devices, macrocell base station (MBS) devices, small cell base station (SCBS) devices, and Cloud-RAN (C-RAN) base station devices; depending on the candidate BAHN model, selecting at least one model adjustment from a group consisting of: modifying a duty cycle or pattern of reduced-power resources; modifying a power reduction factor at the reduced-power resources; altering a range-expansion bias at one or more SCBS and UABS; modifying a scheduling threshold for transitioning user equipment devices to a different base station; modifying a three-dimensional location or a velocity of at least one UABS; modifying a mobility management parameter at a selected user equipment; modifying an operating state of UABS features; aggregating a plurality of component carrier bands using a carrier aggregation feature of LTE; and performing the at least one model adjustment.