| 摘要 |
<p>In a satellite communications system, where normal telephone and related traffic is handled, an additional PMR (Private Mobile Radio) facility is overlaid using 'walkie-talkie' type handsets (55), for communication between a dispatcher (46) and various remote units (48, 50), together with levels of communication including group (114), subgroup (120), multiple subgroup (122) and even one-to-one communication between handsets. The handsets have a unit identity (UID) and a group identity GID employ a standard GSM SIM card. The UID and GID, together with spot beam (30) location (in whatever satellite (10) array of spot beams (30) are stored in mobile reference table (76) so that access is instant and seamless.</p> |
