Apparatuses and methods of sending, to a policy control unit of a mobile communications network, congestion information for a plurality of mobile entities are described. A count value is determined based upon the number of generated short-term keys that are used to decrypt particular content from the BCMCS. A movable platform carries a plurality of base sections, and a plurality of wing assembly support sections rest on base sections and include wing assembly connectors, which are movable in a first plane and a second plane generally perpendicular relative to the first plane. The announcement interface system formats the received portion of the participant data into an announcement system message and transmitting the announcement system message including the participant data, the participant identifier and participant timing data. A value of the line voltage is determined based on the calculated slopes. Some of the information blocks of the sequence have relative proportions of emulation control information and emulation data that differ from the relative proportions of emulation control information and emulation data in other blocks of the sequence.