Signalling and control protocol for a communication system
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United States of America Patent
Stats
-
Dec 11, 1990
Grant Date -
N/A
app pub date -
Nov 25, 1988
filing date -
Nov 25, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A signalling and control protocol is provided wherein each subscriber unit (106) operating within a communication system (100) must transmit a request (200, 200' or 200') to communicate to a central station. If a communication channel is available, the central station returns a channel grant (210), which includes a time code representing a time duration during which the requesting subscriber may communicate. After receiving the channel grant (210), the subscriber unit may communicate for a time interval not exceeding the time duration, and, immediately prior to the expiration of the time duration, the subscriber unit may itself provide a warning tone indicating the impending loss of the communication channel. Conversely, if a communication channel is not available, the central station provides a busy message (216), which includes a code (218) representing the requesting subscriber unit's position is a call request queue.
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