Trunked multi-site dispatch network for trunking radios

• US 6,021,326 A
• Filed: 11/04/1996
• Issued: 02/01/2000
• Est. Priority Date: 11/04/1996
• Status: Expired due to Fees

• Current Assignee: Uniden America Corporation (Cornwall Capital Management LP)
• Original Assignee: Uniden America Corporation (Cornwall Capital Management LP)
• Inventors: Nguyen, Hung L.
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US08/743,471
• Time in Patent Office: 1,184 Days
• Field of Search: 455/422, 455/426, 455/38.1, 455/507, 455/509, 455/511, 455/517, 455/518, 455/520, 370/338, 370/341, 370/389
• US Class Current: 455/422.1
• CPC Class Codes: H04Q 2213/13095 PIN / Access code, authentication
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13199 Modem, modulation
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13405 Dual frequency signaling, DTMF
• CPC Class Codes: H04Q 3/002 Details
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

A system for networking dispatch-type of communications. A plurality of radio cells are coupled to a centralized hub controller via the public switched telephone network. The radio cells are networked together via the hub controller using one or more telephone voice lines and a respective data line for providing communications between each radio cell and the hub controller. Data packets are transferred between the radio cells and the hub controller on the data lines to set up a path for the dispatch communications on the telephone voice lines. The hub controller carries out a trunking function of the telephone voice lines so that the number of voice lines are minimized, while yet preventing blocking of dispatch communications.

Claims

1. A dispatch-type of communication system having a plurality of radio cells networked together, comprising:

a plurality of radio cells, each including a processor for controlling a respective plurality of repeaters for servicing a plurality of radio transceivers in a predefined geographical area, and each including a modem and plural voice ports;

a hub arbitrator having a programmed processor, a switching network and a plurality of modems;

a plurality of voice lines coupled between the voice ports of each said radio cell and the hub arbitrator switching network via a public switched network;

a data line, separate from said voice lines, coupled between a modem of each respective radio cell and a respective modem of said hub arbitrator, via said public switched network; and

said hub arbitrator processor and each said radio cell processor being programmed to transmit and receive via said data lines, packets of data including a field dedicated to identifying a group of transceivers associated with at least one said radio cell, and said hub arbitrator processor being programmed to select one said voice line between a radio cell transmitting a voice message and a plurality of radio cells receiving said voice message.

2. A dispatch-type of communication system having a plurality of radio cells networked together, comprising:

a plurality of radio cells, each serving a respective plurality of dispatch-type radios, each said radio cell including a processor and a plurality of repeaters for trunking dispatch communications;

a programmed hub controller;

a respective data line and at least one respective voice line connecting each said radio cell to said hub controller, said data lines and said voice lines being maintained off-hook to thereby expedite communications; and

said hub controller having a connection bridge for connecting an incoming voice line to plural outgoing voice lines to thereby broadcast an originating voice message from one said radio cell to plural destination radio cells, said hub controller being programmed to maintain a busy/idle table of the voice lines, and said hub controller being programmed to respond to a key request of a radio to select an idle voice line coupled to each destination radio cell for transmission of a voice message following the key request, and to idle the voice line in response to a dekey request of the radio.

3. The communication system of claim 2, wherein said voice lines are coupled from the respective radio cells to said hub controller via a public switched telephone network.

4. The communication system of claim 2, further including a bridging circuit for coupling voice signals originating from one said radio cell to a plurality of destination radio cells via a corresponding plurality of voice lines.

5. A dispatch-type communication system having a plurality of radio cells networked together, comprising:

a first radio cell having a plurality of radios and a plurality of repeaters for trunking communications to said radios;

a second radio cell having a plurality of radios and a plurality of repeaters for trunking communications to said radios associated with said second radio cell; and

a programmed central controller coupled to said first radio cell and said second radio cell by respective telephone lines, said central controller being programmed to select respective idle telephone lines connected to said first and second radio cells in response to dispatch-type of communications therebetween.

6. The communication system of claim 5, wherein said telephone lines include voice telephone lines and data telephone lines, and further including a modem in each said radio cell for transmitting dispatch call set-up data signals on said data lines to said central controller.

7. The communication system of claim 5, wherein said central controller includes a voice bridge for receiving a dispatch voice message on a telephone line and coupling said voice message via plural telephone lines to a corresponding plurality of destination radio cells.

8. The communication system of claim 5, wherein said central controller is programmed to maintain a busy/idle table of the telephone lines connected to the radio cells, and programmed to select idle telephone lines to transfer dispatch voice communications thereon.

9. The communication system of claim 8, wherein said central controller is programmed to select various different idle telephone lines during a bi-directional dispatch communication.

10. In a dispatch-type of communication system having a plurality of radio cells networked together, a method of trunking voice lines coupled between said radio cells, comprising the steps of:

placing at least two voice lines coupled to each said radio cell in an operational mode for carrying voice signals;

receiving by a first radio cell originating a unidirectional voice message, an identification of a first voice line of the plurality of voice lines on which to transmit voice signals;

receiving by at least one second radio cell an identification of one voice line of the plurality of voice lines on which to receive the transmitted voice signals;

receiving by said first and second radio cells an identification of a second voice line on which to carry a voice message in response to the transmitted voice message; and

transmitting a unidirectional response voice message over said second voice line from said second radio cell to said first radio cell.

11. The method of claim 10, further including trunking said first and second voice lines by a hub controller for carrying separate voice signals between a third and fourth radio cell.

12. A dispatch communication system for carrying out the method of claim 10.

13. The method of claim 10, further including receiving said identifications by said first radio cell and said second radio cell from a hub controller, and coupling said first and second voice lines respectively to said first and second radio cells via said hub controller.

14. The method of claim 13, further including transmitting said identifications to said first and second radio cells by a hub controller via data lines separate from said voice lines.

15. A method of carrying out a dispatch-type of communication in which a push-to-talk action in one radio cell results in a message broadcast to a destination radio cell, comprising the steps of:

in response to a push-to-talk request in said one radio cell, transferring a data request to a central controller;

selecting by said central controller a first idle voice line connected to said one radio cell;

transmitting by said central controller to said destination radio cell an identification of an originating communication corresponding to said push-to-talk request;

selecting by said destination radio cell, based on the identification of said originating communication, at least one destination radio receiver; and

allowing by said central controller a broadcast of voice signals associated with the push-to-talk communication from said one radio cell via the selected telephone voice line to said selected destination radio receiver to receive the voice signals.

16. The method of claim 15, further including selecting by said controller a second idle voice line connected to the destination radio cell, and transferring the broadcast voice signals carried on the first voice line to the second voice line.

17. The method of claim 15, further including placing said first voice line in an off-hook condition prior to initiation of said push-to-talk request.

18. The method of claim 15, further including trunking said first voice line so as to carry voice signals originating at different radio cells.

19. The method of claim 15, further including a plurality of off-hook voice lines coupled between said one radio cell and said central controller, and utilizing more than one said off-hook voice line during a bidirectional dispatch communication between said one radio cell and said destination radio cell.

20. The method of claim 15, further including transmitting the voice signals corresponding to said originating communication by said one radio cell to a plurality of radios in a local geographical area of coverage of said one radio cell.

21. The method of claim 15, further including maintaining by said central controller a busy/idle table of the voice lines coupled to said originating radio cell and to said destination radio cell.

22. The method of claim 15, further including carrying out a full duplex communication without utilizing said central controller to select busy/idle telephone lines during the communication.

23. The method of claim 15, further including initially connecting said first radio cell to said central controller with at least one pair of telephone lines, and dedicating one said telephone line for trunked voice communications and dedicating another said telephone line for data packet transmission, and maintaining said pair of telephone lines in an off-hook condition.

24. The method of claim 23, further including programming said central controller to carry out an initialization procedure that establishes the off-hook data telephone line and the off-hook telephone voice line to said originating radio cell and destination radio cells, and thereafter maintains said data and voice telephone lines in respective off-hook conditions.

25. The method of claim 15, further including utilizing at least one off-hook telephone line connecting said one radio cell to said central controller for voice communications, and at least one off-hook data line connecting said one radio cell to said central controller for data communications.

26. The method of claim 25, further including transmitting on said data line a packet of data identifying a type of command.

27. The method of claim 26, wherein said one radio cell includes a plurality of groups of push-to-talk radios, and further including a group identification associated with each said group of radios, and further including the step of transmitting a group identification with each said push-to-talk request.

28. The method of claim 15, further including transmitting by said central controller to a plurality of different destination radio cells the identification of the originating communication, and broadcasting the voice signals corresponding to the originating communication via respective voice lines to said plural destination radio cells.

29. The method of claim 28, further including broadcasting the voice signals corresponding to the originating communication to each said destination radio cell via a different said voice line.

30. The method of claim 29, further including bridging by said central controller the voice signals corresponding to the originating communication to said plural voice lines coupled to the respective destination radio cells.