| 摘要 |
<p>A satellite communication system (116) provides users with global cellular coverage. To facilitate delivery of calls to users having subscriber units (300), a fixed channel is defined wherein subscriber units (300) are notified of incoming calls. Subscriber units (300) monitor this ring alert channel (48) and examine subscriber unit IDs (90) transmitted in a ring alert message (82) contained therein. When a subscriber unit (300) determines from the subscriber unit ID (90) that a call is being directed to it, it calls into a network to receive a call. Subscriber units (300) also monitor this fixed channel to receive a control channel directory identifying the location of a subscriber unit's broadcast (control) channels.</p> |
