Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2006-08-08
2006-08-08
Gesesse, Tilahun (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S518000, C455S554100, C370S276000, C375S219000
Reexamination Certificate
active
07089026
ABSTRACT:
A receiving device in a trunked radio communications system retrieves a first frequency, wherein the first frequency relates to a lowest frequency that the at least one repeater utilizes for transmission and tunes to about the first frequency. If no control channel messages are decoded at the first frequency, then the receiving device tunes to about a second frequency wherein the second frequency is a channel separation of 12.5 kHz from the first frequency. If no control channel messages are decoded at the second frequency, then the receiving device, iteratively increments the second frequency by the channel separation until the second frequency reaches an end of band frequency for the trunked radio communications system.
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TIA TSB-102.AABC, “Project 25 Trunking Control Channel Messages New Technology Standards Project Digital Radio Technical Standards TR-8.10 Subcomittee”, May 31, 1996.
TIA TSB-102.AABD, “Project 25 Trunking Procedures New Technology Standards Project Digital Radio Technical Standards”, Oct. 1997.
Almasi Andor
Cassidy Marc W.
Griffis Donald R.
Trandai Tanhoa
Gesesse Tilahun
Motorola Inc.
Saladi Indira
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