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

• US 7,096,013 B1
• Filed: 08/30/2005
• Issued: 08/22/2006
• Est. Priority Date: 08/30/2005
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: McDonald, Daniel J., Wilson, Christopher H., Trandai, Tanhoa
• Primary Examiner(s): Gary, Erika A.
• Application Number:
  US11/215,172
• Time in Patent Office: 357 Days
• Field of Search: 455/426.1, 455/434, 455/450, 455/451, 455/452.1, 455/452.2, 455/446, 455/518, 455/509, 455/62, 455/71, 455/179.1
• US Class Current: 455/426.1
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

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.

Claims

1. In a trunked radio communications system operating in the 800 MHz spectrum, wherein the trunked radio communications system comprises at least one site, at least one control channel, at least one voice channel, and a plurality of receiving devices, a method for operating by mapping channels to frequencies, the method comprising the steps of:

at a receiving device in the trunked radio communications system;

receiving 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; and

tuning to about a transmit frequency of 806.0250 MHz, if the voice channel number is 440;

tuning to about a transmit frequency of 806.0500 MHz, if the voice channel number is 441;

tuning to about a transmit frequency of 806.0750 MHz, if the voice channel number is 442;

tuning to about a transmit frequency of 806.1000 MHz, if the voice channel number is 443;

tuning to about a transmit frequency of 806.1250 MHz, if the voice channel number is 444;

tuning to about a transmit frequency of 806.1500 MHz, if the voice channel number is 445;

tuning to about a transmit frequency of 806.1750 MHz, if the voice channel number is 446;

tuning to about a transmit frequency of 806.2000 MHz, if the voice channel number is 447;

tuning to about a transmit frequency of 806.2250 MHz, if the voice channel number is 448;

tuning to about a transmit frequency of 806.2500 MHz, if the voice channel number is 449;

tuning to about a transmit frequency of 806.2750 MHz, if the voice channel number is 450;

tuning to about a transmit frequency of 806.3000 MHz, if the voice channel number is 451;

tuning to about a transmit frequency of 806.3250 MHz, if the voice channel number is 452;

tuning to about a transmit frequency of 806.3500 MHz, if the voice channel number is 453; and

tuning to about a transmit frequency of 806.3750 MHz, if the voice channel number is 454.

2. The method of claim 1 further comprising:

modulating the communication to about the transmit frequency; and

transmitting the modulated communication with a transmit deviation that relates to a maximum of 4 kHz.

3. The method of claim 1 wherein the receiving device is at least one of a subscriber, a subscriber unit, a radio, a mobile, a portable, a receiver, a scanner, and a scanner device.

4. The method of claim 1 further comprising receiving at a receive frequency which is 45 MHz from the transmit frequency.

5. The method of claim 4 wherein the receive frequency is calculated by adding 45 MHz to the transmit frequency.

6. In a trunked radio communications system operating in the 800 MHz spectrum, wherein the trunked radio communications system comprises at least one site, at least one control channel, at least one voice channel, and a plurality of receiving devices, a method for operating by mapping channels to frequencies, the method comprising the steps of:

at a receiving device in the trunked radio communications system;

receiving 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; and

tuning to about a transmit frequency of 806.7750 MHz, if the voice channel number is 470;

tuning to about a transmit frequency of 806.8000 MHz, if the voice channel number is 471;

tuning to about a transmit frequency of 806.8250 MHz, if the voice channel number is 472;

tuning to about a transmit frequency of 806.8500 MHz, if the voice channel number is 473;

tuning to about a transmit frequency of 806.8750 MHz, if the voice channel number is 474;

tuning to about a transmit frequency of 806.9000 MHz, if the voice channel number is 475;

tuning to about a transmit frequency of 806.9250 MHz, if the voice channel number is 476;

tuning to about a transmit frequency of 806.9500 MHz, if the voice channel number is 477;

tuning to about a transmit frequency of 806.9750 MHz, if the voice channel number is 478;

tuning to about a transmit frequency of 807.0000 MHz, if the voice channel number is 479;

tuning to about a transmit frequency of 807.0250 MHz, if the voice channel number is 480;

tuning to about a transmit frequency of 807.0500 MHz, if the voice channel number is 481;

tuning to about a transmit frequency of 807.0750 MHz, if the voice channel number is 482;

tuning to about a transmit frequency of 807.1000 MHz, if the voice channel number is 483; and

tuning to about a transmit frequency of 807.1250 MHz, if the voice channel number is 484.

7. The method of claim 6 further comprising:

modulating the communication to about the transmit frequency; and

transmitting the modulated communication with a transmit deviation that relates to a maximum of 4 kHz.

8. The method of claim 6 wherein the receiving device is at least one of a subscriber, a subscriber unit, a radio, a mobile, a portable, a receiver, a scanner, and a scanner device.

9. The method of claim 6 further comprising receiving at a receive frequency which is 45 MHz from the transmit frequency.

10. The method of claim 9 wherein the receive frequency is calculated by adding 45 MHz to the transmit frequency.

11. The method of claim 6 wherein a relationship between the transmit frequency and the voice channel number is stored in memory in the receiving device.

12. The method of claim 6 wherein the transmit frequency is stored in hexadecimal format.

13. The method of claim 6 further comprising performing mathematical operations to arrive at the transmit frequency.

14. In a trunked radio communications system operating in the 800 MHz spectrum, wherein the trunked radio communications system comprises at least one site, at least one control channel, at least one voice channel, and a plurality of receiving devices, a method for operating by mapping channels to frequencies, the method comprising the steps of:

at a receiving device in the trunked radio communications system;

receiving 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; and

tuning to about a receive frequency of 852.5250 MHz, if the voice channel number is 500;

tuning to about a receive frequency of 852.5500 MHz, if the voice channel number is 501;

tuning to about a receive frequency of 852.5750 MHz, if the voice channel number is 502;

tuning to about a receive frequency of 852.6000 MHz, if the voice channel number is 503;

tuning to about a receive frequency of 852.6250 MHz, if the voice channel number is 504;

tuning to about a receive frequency of 852.6500 MHz, if the voice channel number is 505;

tuning to about a receive frequency of 852.6750 MHz, if the voice channel number is 506;

tuning to about a receive frequency of 852.7000 MHz, if the voice channel number is 507;

tuning to about a receive frequency of 852.7250 MHz, if the voice channel number is 508;

tuning to about a receive frequency of 852.7500 MHz, if the voice channel number is 509;

tuning to about a receive frequency of 852.7750 MHz, if the voice channel number is 510;

tuning to about a receive frequency of 852.8000 MHz, if the voice channel number is 511;

tuning to about a receive frequency of 852.8250 MHz, if the voice channel number is 512;

tuning to about a receive frequency of 852.8500 MHz, if the voice channel number is 513; and

tuning to about a receive frequency of 852.8750 MHz, if the voice channel number is 514.

15. The method of claim 14 wherein the receiving device is at least one of a subscriber, a subscriber unit, a radio, a mobile, a portable, a receiver, a scanner, and a scanner device.

16. The method of claim 14 wherein a relationship between the receive frequency and the voice channel number is stored in memory in the receiving device.

17. The method of claim 14 wherein the receive frequency is stored in hexadecimal format.

18. The method of claim 14 further comprising performing mathematical operations to arrive at the receive frequency.

19. The method of claim 14 further comprising tuning to about a receive frequency of 853.5500 MHz, if the voice channel number is 541.

20. The method of claim 14 further comprising tuning to about a receive frequency of 854.0000 MHz, if the voice channel number is 559.