Signaling protocol for a distributive wide area transmission trunked communication system

• US 5,465,386 A
• Filed: 09/02/1994
• Issued: 11/07/1995
• Est. Priority Date: 03/31/1989
• Status: Expired due to Term

• Current Assignee: E F Johnson Company (JVC Kenwood Corporation)
• Original Assignee: E F Johnson Company (JVC Kenwood Corporation)
• Inventors: Bauman, Donald R., Barnes, Keith W., Keefer, Philip A., Mihelich, Michael E., Brace, Howard N.
• Primary Examiner(s): Urban, Edward F.
• Application Number:
  US08/300,930
• Time in Patent Office: 431 Days
• Field of Search: 455/15, 455/17, 455/33.1, 455/34.1, 455/34.2, 455/54.1, 455/54.2, 379/59, 379/60, 379/63, 340/825.03, 340/825.44
• US Class Current: 455/15
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems
• CPC Class Codes: H04W 92/02 Inter-networking arrangements

Abstract

A land mobile transmission trunked communication system is provided with an enhanced control signal protocol. The land mobile transmission trunked communication system includes a plurality of transceivers for transmitting and receiving transmission trunked radio communications over one or more radio channels. The transmission trunked radio communications comprises an information signal having either voice information, data information, or both, and a control signal. The transceivers communicate with a selected one of a plurality of repeaters to establish transmission trunked radio communications on one of the preassigned set of the radio channels between the repeater and one or more transceivers. The enhanced signaling protocol and switching protocol are especially adapted for communicating control signals in the subaudio band to interconnect a plurality of transmission trunked communication systems into a wide area network. The enhanced switching and signaling protocol provide an expanded feature set of radio communication capabilities.

Claims

1. An improved land mobile transmission trunked communication system having an enhanced control signal protocol, the land mobile transmission trunked communication system including a plurality of transceiver means for transmitting and receiving transmission trunked radio communications over one or more radio channels, the transmission trunked radio communications comprising an information signal having either voice information, data information, or both, and a control signal, the information signals being transmitted on one of a set of preassigned radio channels and the control signals being transmitted simultaneously in the subaudio range of the same channel over which the information signals are transmitted according to a predetermined control signal format, and a plurality of repeater means, each repeater means for establishing transmission trunked radio communications on one of the preassigned set of the radio channels between the repeater means and one or more transceiver means, the improvement comprising:

the predetermined control signal format including;

a first predetermined control signal format when the control signals are transmitted from the transceiver means to the repeater means having;

a nine bit Sync field that initializes and synchronizes the repeater means;

a one bit Reserved field that indicates a transceiver means control message;

a ten bit GoTo field that contains a directly decodable predetermined radio channel number of one of the repeater means to which the control signals are being transmitted;

a five bit Home field that contains a predetermined home number of the transceiver means sending the control signal;

an eight bit Group field that contains a Group ID code of a fleet or subfleet of transceiver means which are being called;

a three bit Status field that defines the status of the transceiver means;

a thirteen bit Unique ID field that contains a unique identification number for the transceiver means;

a three bit Priority field that indicates a predetermined priority level assigned to the transceiver means; and

an eight bit Checksum field that includes a seven bit truncated BCH encoding scheme checksum and a single bit parity; and

a second predetermined control signal format when the control signals are transmitted from the repeater means to the transceiver means having;

a nine bit Sync field that initializes and synchronizes the transceiver means;

a one bit Reserved field that indicates a repeater means control message;

a ten bit GoTo field that contains a directly decodable predetermined radio channel number of one of the repeater means that the transceiver means should tune to in order to receive the control signals that are being transmitted by that repeater means;

a five bit Home field that contains a predetermined home number of one of the repeater means;

an eight bit Group field that contains a Group ID code of a fleet or subfleet of transceiver means which are being called;

a ten bit Free field that contains a directly decodable predetermined radio channel number of one of the repeater means that is not busy and is available for service;

a thirteen bit Unique ID field that contains the unique identification number for the transceiver means;

a three bit Priority field that indicates a current operating priority level for all of the repeater means; and

an eight bit Checksum field that includes a seven bit truncated BCH encoding scheme checksum and a single bit parity.

2. The land mobile transmission trunked communication system of claim 1 wherein the first and second predetermined control signal formats are further encrypted using a two word encoding key to encode and decode each control signal transmission whereby a first word encoding key is used to encrypt the entire first or second predetermined control signal except the Sync field and a second word encoding key is used to encrypt the Checksum field.

3. The land mobile transmission trunked communication system of claim 1 wherein values in the GoTo field transmitted by each repeater means are distributively controlled by the respective repeater means associated with the radio channel on which the GoTo field is transmitted.

4. An improved transceiver means for use in a land mobile transmission trunked communication system that transmits and receives transmission trunked radio communications over one or more radio channels, the transmission trunked radio communications comprising an information signal having either voice information, data information, or both, and a control signal, the information signals being transmitted on one of a set of preassigned radio channels and the control signal being transmitted simultaneously in the subaudio range of the same channel over which the information signals are transmitted according to a predetermined control signal format, the transmission trunked communication system including a plurality of repeater means, each repeater means for establishing transmission trunked radio communications on one of the preassigned set of the radio channels between the repeater means and the transceiver means, the improvement comprising:

the predetermined control signal format including;

a first predetermined control signal format when the control signals are transmitted from the transceiver means to the repeater means having;

a nine bit Sync field that initializes and synchronizes the repeater means;

a one bit Reserved field that indicates a transceiver means control message;

a ten bit GoTo field that contains a directly decodable predetermined radio channel number of one of the repeater means to which the control signals are being transmitted;

a five bit Home field that contains a predetermined home number of the transceiver means sending the control signal;

an eight bit Group field that contains a Group ID code of a fleet or subfleet of transceiver means which are being called;

a three bit Status field that defines the status of the transceiver means;

a thirteen bit Unique ID field that contains a unique identification number for the transceiver means;

a three bit Priority field that indicates a predetermined priority level assigned to the transceiver means; and

an eight bit Checksum field that includes a seven bit truncated BCH encoding scheme checksum and a single bit parity; and

a second predetermined control signal format when the control signals are transmitted from the repeater means to the transceiver means having;

a nine bit Sync field that initializes and synchronizes the transceiver means;

a one bit Reserved field that indicates a repeater means control message;

a ten bit GoTo field that contains a directly decodable predetermined radio channel number of one of the repeater means that the transceiver means should tune to in order to receive the control signals that are being transmitted by that repeater means;

a five bit Home field that contains a predetermined home number of one of the repeater means;

an eight bit Group field that contains a Group ID code of a fleet or subfleet of transceiver means which are being called;

a ten bit Free field that contains a directly decodable predetermined radio channel number of one of the repeater means that is not busy and is available for service;

a thirteen bit Unique ID field that contains the unique identification number for the transceiver means;

a three bit Priority field that indicates a current operating priority level for all of the repeater means; and

an eight bit Checksum field that includes a seven bit truncated BCH encoding scheme checksum and a single bit parity.

5. The transceiver means of claim 4 wherein the first and second predetermined control signal formats are further encrypted using a two word encoding key to encode and decode each control signal transmission whereby a first word encoding key is used to encrypt the entire first or second predetermined control signal except the Sync field and a second word encoding key is used to encrypt the Checksum field.