Trunked radio repeater communication system including home channel aliasing and call grouping

• US 6,804,529 B1
• Filed: 02/02/2001
• Issued: 10/12/2004
• Est. Priority Date: 05/28/1997
• Status: Expired due to Term

• Current Assignee: Transcrypt Internationall E F Johnson Company
• Original Assignee: Transcrypt Internationall E F Johnson Company
• Inventors: Smith, Rory A., Grindahl, Mervin L., Barnes, Keith W.
• Primary Examiner(s): Maung, Nay
• Assistant Examiner(s): SOBUTKA, PHILIP
• Application Number:
  US09/776,416
• Time in Patent Office: 1,348 Days
• Field of Search: 455/515, 455/517, 455/518, 455/519, 455/509, 455/520, 455/524
• US Class Current: 455/515
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 36/0009 for a plurality of users or terminals, e.g. group communication or moving wireless networks user group management H04W4/08; processing of subscriber group data H04W8/186
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• 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 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A system for channel assignment in a trunked transmission communication system including a plurality of subscribers. A plurality of subscribers is provided home channel assignment to reduce collisions. A home channel alias is provided for home channel coverage where a designated home channel is unavailable. A system for call grouping is provided to avoid talk group splitting. A first check is used to determine if other channels are conducting communications with identical home and talk group information. A second check is available after a temporary channel assignment. In one system both the home channel aliasing and call grouping are performed.

Claims

1. A method comprising:

selecting a first subset of primary home channels from a plurality of candidate channels;

configuring each of a plurality of repeaters within a locality to monitor a primary home channel, wherein each primary home channel is monitored by a particular repeater of the plurality of repeaters;

receiving a subaudio message on a particular alias home channel selected from a second subset of alias home channels selected from the plurality of candidate channels, wherein each alias home channel is associated with a primary home channel; and

if the primary home channel associated with the particular alias home channel is available for communications, conducting communications on the primary home channel; and

otherwise, seeking a next available channel.

2. The method of claim 1 wherein receiving a subaudio message includes receiving subaudible digital data.

3. The method of claim 1 wherein receiving a subaudio message includes receiving subaudible digital data simultaneous with voice modulation.

4. The method of claim 1 wherein receiving a subaudio message includes receiving a control signal.

5. The method of claim 1 further comprising transmitting to a roaming subscriber within the locality.

6. The method of claim 1 further comprising transmitting a subaudio signal to a roaming subscriber within the locality.

7. The method of claim 1 further comprising transmitting a control signal to a particular subscriber.

8. The method of claim 7 wherein transmitting a control signal to a particular subscriber includes transmitting an instruction to remain on a particular channel.

9. The method of claim 7 wherein transmitting a control signal to a particular subscriber includes transmitting an instruction to change to a particular channel.

10. A method comprising:

receiving a first wireless subaudio control signal from a first subscriber having a first group identification code, the first control signal including a request to communicate; and

transmitting a handshake signal to the first subscriber and a second subscriber having the particular home channel assignment, a squelch, and a second group identification code, wherein if the second group identification code matches the first group identification code then the handshake signal instructs the second subscriber to open the squelch and wherein if the second group identification code is different than the first group identification code, then the handshake signal instructs the second subscriber to close the squelch and await a second subaudio control signal instruction indicating that the particular home channel is busy and a free channel assignment.

11. The method of claim 10 further comprising transmitting the second subaudio control signal instruction indicating that the particular home channel is busy.

12. The method of claim 10 further comprising transmitting the second subaudio control signal instruction including a free channel assignment.

13. The method of claim 10 wherein receiving a first wireless subaudio control signal from a first subscriber includes receiving a first wireless subaudio control signal on a particular home channel assigned to the first subscriber.

14. The method of claim 10 wherein receiving a first wireless subaudio control signal from a first subscriber includes receiving a first wireless subaudio control signal on a free channel assigned to the first subscriber.

15. A method comprising:

uniformly distributing candidate home channel numbers across a range of available channel numbers;

assigning a home channel to each subscriber;

receiving a subaudio message on a particular candidate home channel number corresponding to a particular home channel assigned to a particular subscriber;

if the particular home channel is a candidate home channel number, conducting communications on the particular home channel; and

otherwise, seeking a next available candidate home channel number.

16. The method of claim 15 wherein seeking a next available candidate home channel number comprises scanning the candidate home channel numbers below the assigned home channel.

17. The method of claim 15 wherein seeking a next available candidate home channel number comprises scanning the candidate home channel numbers above the assigned home channel.

18. The method of claim 15 wherein conducting communications includes communicating home channel information using a home code, open channel information using a free channel code, and channel in use information.

19. The method of claim 15 wherein conducting communications includes conducting voice communications.

20. The method of claim 15 further comprising:

upon receipt of a group call transmission from the particular subscriber on a first channel, checking for a second channel conducting communications having an identical home channel and an identical talk group; and

if a second channel exists, instructing the particular subscriber to use the second channel for communications.

21. The method of claim 20 further comprising if the second channel is conducting communications using a home channel alias associated with the identical home channel and the identical talk group, instructing the particular subscriber to use the second channel for communications.

22. The method of claim 20 further comprising if the second channel does not exist, allowing the particular subscriber to conduct communications on the first channel.

23. The method of claim 20 further comprising if a second channel is not found, temporarily granting the first channel for use by the particular subscriber and performing a second test to determine if the first channel is fully granted.