Motorola Corporation

Motorola Solutions, Inc.

Christopher H Wilson

Daniel J McDonald

Tanhoa Trandai

John M Gilbert

Paul M Erickson

Alan L Wilson

Robert L Epsom

Paul J Cizek

Donald R Griffis

A receiving device in the trunked radio communications system receives an outbound signaling word comprising at least an opcode field and a band plan field, wherein the opcode field indicates that the outbound signaling message is a system status message and the band plan field indicates the band plan in use on the site. In another embodiment, the receiving device receives an outbound signaling word comprising at least an opcode field, a site identification field and a four bit band plan field, wherein the opcode field indicates that the outbound signaling message is an adjacent control channel message, the site identification field identifies a second site, and the four bit band plan field indicates the band plan in use on the second site.

Method for indicating a band plan for a trunked radio communications system

A receiving device in a trunked radio communications system determines a transmit frequency, wherein the transmit frequency is calculated by subtracting 440 from a voice channel number, multiplying by a channel spacing and adding a base frequency to yield the transmit frequency, if the voice channel number is between 440 and 559. The receiving device determines a receive frequency by 851.0250 MHz+[(a voice channel number&#x2212;440)*25,000 Hz], if the voice channel number is between 440 and 559. In any case, the voice channel number is communicated in an outbound signaling message defined by Motorola's 3600-baud radio trunking protocol.

Method for operating in a 800 MHz trunked radio communications system for channels 440 to 559

A receiving device in a trunked radio communications system determines transmit and receive frequencies by a mapping. The receiving device receives a voice channel number, wherein the voice channel number is communicated in an outbound signaling message defined by Motorola's 3600-baud radio trunking protocol. The receiving device tunes to about a transmit frequency of 806.0250 MHz, if the voice channel number is 440; tunes to about a transmit frequency of 806.0500 MHz, if the voice channel number is 441; tunes to about a transmit frequency of 806.0750 MHz, if the voice channel number is 442; etc. The receiving devices tunes to about a receive frequency of 852.5250 MHz, if the voice channel number is 500; tunes to about a receive frequency of 852.5500 MHz, if the voice channel number is 501; tunes to about a receive frequency of 852.5750 MHz, if the voice channel number is 502; etc.

Method for operating in an 800 MHz trunked radio communications system by mapping channels to frequencies

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.

Method for operating in a 800 MHz trunked radio communications system for channels 0 to 119

A mobile repeater (300) is improved to include a database (303) that allows the mobile repeater to store registrations received from subscriber units. Additionally, the mobile repeater may include a voice on control switching element (309) for use with an extended control channel. Further still, the mobile repeater may include encryption elements (305-308) for the maintenance of encrypted control channels. In this manner, the mobile repeater may provide an improved quality of services to subscriber units.

Method and apparatus for a mobile repeater

A router (200) comprising a router controller (203) coupled to a packet-switched interface (202) and a circuit-switched timedivision multiplexed interface (204) allows framed packet-data to be conveyed through a circuit-switched system, Inbound address information (208) included with inbound framed packet-data (207) is used by the router controller to route inbound packets (209) to associated inbound time slots (211). Conversely, the router controller determines outbound address information (218) for outbound packets (216) based on identifications (214) of associated outbound time slots (213). Such a router can be incorporated into a communication system 700. Sites (701-702) that transceive framed packet-data are coupled to a circuit-switched digital cross-connect switch (705) via the routers. A system controller (706) controls the circuit-switched digital cross-connect switch such that the associated inbound time slots are broadcast to at least the associated outbound time slots.

Router and method for use in a communication system

A simulcast broadcast system wherein two signals (103 and 106) intended for simultaneous broadcast are transmitted from a source site (100) to remote sites (200) discrete from one another. At the remote sites, the two signals are separately processed, including the introduction of appropriate delay (305 and 312), prior to combining them for broadcast in conjunction with other remote sites. One or more monitoring sites (400) can also be provided to monitor reception coherence within the system and to provide operating measurement information to allow automatic control of various simulcast system parameters, including delay.

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Lake Zurich, IL, United States of America

Christopher H Wilson