| 摘要 |
A SATELLITE COMMUNICATION SYSTEM (10, 300, 400) FOR DELIVERING SIMPLEX MESSAGES TO SUBSCRIBERS (26, 351, 451) COMPRISES MULTIPLE MESSAGE ORIGINATION CONTROLLERS (MOCS) (311-319, 411-419), ONE OR MORE MESSAGE TERMINATION CONTROLLERS (MTCS) (321-329, 421), SATELLITES (12, 331-335, 431-435), AND GEOGRAPHICALLY-DIVERSE COMMUNICATION UNITS (26, 351, 451). MESSAGES DESTINED FOR PARTICULAR COMMUNICATION UNITS (26, 351, 451) ARE TRANSMITTED (512) TO THE ONE OR MORE MTCS (321- 329, 421).THE ONE OR MORE MTCS (321-329, 421) THEN SCHEDULE DELIVERY (520, 608) OF THE MESSAGES TO COMMUNICATIONS UNITS (26,351, 451) BY EMPLOYING A BLOCKED TIMING STRUCTURE (200) FOR DELIVERY OF THE MESSAGES. THE ONE OR MORE MTCS (321-329, 421) TRANSMIT (524) THE SCHEDULED MESSAGES TO SATELLITES (12, 331-335, 431-435) WHICH BROADCAST (528, 720) THE MESSAGES TO COMMUNICATION UNITS (26, 351, 451) AT THE SCHEDULED TIME. COMMUNICATION UNITS (26, 351, 451) ARE ASSIGNED SPECIFIC TIMING BLOCKS (204-208) DURING WHICH THEY MONITOR RADIO SIGNALS (820) FOR MESSAGES DIRECTED TO THEM. DURING NON-ASSIGNED TIMING BLOCKS (204-208), COMMUNICATION UNITS (26, 351, 451) REMAIN IN A LOW-POWER STATE (804, 834). |
