Abstract: The technology relates to power saving modes for subsystems in solar powered aircraft. An onboard subsystem of an aircraft includes a first processor configured to monitor a state of the subsystem and generate state data; a heating component configured to heat the subsystem to at least a minimum viable temperature; an operational component; and a hardware controller configured to control power to the heating component, the first processor, and the operational component, at least during a preservation mode and a monitoring mode. The subsystem draws a moderate amount of power when the heating component is on and a minimum threshold amount of power in the preservation mode. The subsystem draws a moderate amount of power in the monitoring mode in order to generate and communicate state data by the first processor, a moderate amount of power being lower than the higher amount of power required to operate the operational component.

Abstract: A method and an apparatus are provided for minimizing interference caused by a plurality of high-altitude platforms (HAPs) configured for operation in the stratosphere. At least one receiver in a node receives information including a plurality of parameters associated with the HAPs and areas on the ground to which HAPs provide communication services. At least one processor analyzes the information to determine at least one of time symbol offsets and physical cell identifies (PCIs) for each of the HAPs to provide the communication services with minimal interference. At least one transmitter transmits command signals including setting instructions with regard to at least one of time symbol offsets and PCIs the HAPs should use to minimize interference while providing communication services.