Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-08-01
2006-08-01
Maung, Nay (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S062000, C455S071000, C455S452100, C455S455000, C370S327000, C370S329000, C370S341000
Reexamination Certificate
active
07085573
ABSTRACT:
A receiving device in a trunked radio communications system requests a voice channel for a communication and receives an outbound signaling message on a control channel comprising a voice channel number for the receiving device to utilize for the communication. The receiving device tunes to about a transmit frequency, wherein the transmit frequency is determined by multiplying the voice channel number by a channel spacing and adding a base frequency to yield the transmit frequency, if the voice channel number is between 0 and 119. The receiving device modulates the communication to about the transmit frequency and transmits the modulated communication with a transmit deviation that relates to a maximum of 4 kHz.
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TIA TSB-102.AABD, “Project 25 Trunking Procedures New Technology Standards Project Digital Radio Technical Standards”, Oct. 1997.
McDonald Daniel J.
Trandai Tanhoa
Wilson Christopher H.
Maung Nay
Motorola Inc.
Saladi Indira
Wendell Andrew
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