Signalling and control protocol for a communication system

Details Signalling and control protocol for a communication system Signalling and control protocol for a communication system

1988-11-25

1990-12-11

Dwyer, James L.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 63, H04B 726

Patent

active

049775898

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.

REFERENCES:
patent: 4785408 (1988-11-01), Britton et al.
patent: 4788715 (1988-11-01), Lee

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