Method of controlling communications in a cellular radiotelephon

Details Method of controlling communications in a cellular radiotelephon Method of controlling communications in a cellular radiotelephon

1988-08-04

1991-01-08

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455 54, 379 60, 379 63, 3701101, H04Q 700

Patent

active

049842900

ABSTRACT:
A cellular system employs a subaudible signalling control protocol. The protocol includes transmitting supervisory related signals between the radiotelephone and one of the cell sites at a first subaudible digital bit rate, and transmitting data messages between the radiotelephone and said one of the cell sites at a second subaudible digital bit rate. Additionally, the system employs specific protocols involving alert, hand-off and call disconnect which accommodate the subaudible signalling, yet provide significant integrity and reliability advantages over previously known protocols.

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A Schematic Diagram of "In-Service Control Data Transmission System" (FIG. 2).
"High Capacity Automobile Telephone System", Japan Telecommunications Review, Jan. 1979.
"Digital Cellular Release", by Steve Levine, Larry Puhl and Tom Hull, Motorola Technical Developments, vol. 7, Oct. 1987, pp. 35 and 36.

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