A system for beaming power to a high altitude platform is based upon a high power millimeter gyrotron source, optical transmission components, and a high-power receiving antenna capable of rectifying received millimeter energy and converting such energy into useable electrical power. The communication device also includes a controller for selecting the communication channel, the communication protocol, and the identification information corresponding to the specifying information of a receiving communication device, from registered information within an ability management table, and for carrying out the communication by the communication unit. By doing this, the handoff manager can delay the disconnection of the packet data session until there is sufficient network resources or until an internal packet data protocol error occurs due to a request timing out. A restriction portion restricts an operating range of the outer rotor in a direction perpendicular to an eccentric direction.