High capacity cellular communications system coverage of airborne mobile communications equipment

摘要

Telecommunications service is provided to mobile equipment aboard an airborne aircraft. A master coordination node (MCN) coordinates communication from groups of subordinate nodes in the network such that each group communicates a different layer of data to the mobile communication equipment aboard the aircraft. Each group of subordinate nodes transmits beam steered, Doppler shift compensated downlink signals directed at the aircraft. Coordination controls the timing of transmissions from the subordinate nodes so as to have signals received by the mobile communication equipment from the groups of subordinate nodes keep within a required temporal delay of a cyclic prefix in the received signals; the Doppler shift pre-compensation performed by each subordinate node such that the mobile communication equipment aboard the aircraft experiences a nominal carrier frequency when receiving transmissions from each of the subordinate nodes; and ensuring mutual compatibility of the signals transmitted by each of the groups of subordinate nodes.