US 9,814,014 B2
System and method for providing mobility management and out-of-coverage indication in a conventional land mobile radio system
Arindam Roy, Plano, TX (US); Linda Trine, Keller, TX (US); and Marshall Jobe, Fort Worth, TX (US)
Assigned to E.F. Johnson Company, Irving, TX (US)
Filed by E.F. JOHNSON COMPANY, Irving, TX (US)
Filed on Jul. 7, 2014, as Appl. No. 14/325,332.
Application 14/325,332 is a continuation of application No. 13/174,507, filed on Jun. 30, 2011, granted, now 8,774,093.
Claims priority of provisional application 61/398,919, filed on Jun. 30, 2010.
Prior Publication US 2014/0308949 A1, Oct. 16, 2014
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 64/00 (2009.01); H04W 24/08 (2009.01); H04W 36/00 (2009.01); H04W 60/04 (2009.01)
CPC H04W 64/00 (2013.01) [H04W 24/08 (2013.01); H04W 36/0088 (2013.01); H04W 60/04 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for providing mobility management and out-of-coverage indication in a conventional land mobile radio system implementing a Project 25 conventional system protocol, the method comprising:
monitoring, by a radio implementing the Project 25 conventional system protocol, a traffic channel of the conventional land mobile radio system implementing the Project 25 conventional system protocol;
determining the radio implementing the Project 25 conventional system protocol is within coverage of the conventional land mobile radio system implementing the Project 25 conventional system protocol, in response to at least one of:
(a) the radio receiving one or more automatically pushed periodic data packets transmitted at a regular configured period of time across the traffic channel in compliance with the Project 25 conventional system protocol from a first land mobile radio site in the conventional land mobile radio system implementing the Project 25 conventional system protocol, and
(b) the radio implementing the Project 25 conventional system protocol detecting activity on the traffic channel during an amount of time, the activity comprising a user initiated call comprising audio complying with the Project 25 conventional system protocol and originating from a remote radio implementing the Project 25 conventional system protocol;
determining that the radio implementing the Project 25 conventional system protocol is out-of-coverage of the conventional land mobile radio system implementing the Project 25 conventional system protocol in response to both:
(i) the radio implementing the Project 25 conventional system protocol not receiving during the amount of time one of the automatically pushed periodic data packets transmitted at the regular configured period of time across the traffic channel in compliance with the Project 25 conventional system protocol from the first land mobile radio site in the conventional land mobile radio system implementing the Project 25 conventional system protocol to the radio implementing the Project 25 conventional system protocol, and
(ii) the radio implementing the Project 25 conventional system protocol not detecting activity on the traffic channel during the amount of time, the activity comprising the user initiated call comprising audio complying with the Project 25 conventional system protocol and originating from the remote radio implementing the Project 25 conventional system protocol; and
receiving, when the radio implementing the Project 25 conventional system protocol is within coverage of the conventional land mobile radio system implementing the Project 25 conventional system protocol, radio data in compliance with the Project 25 conventional system protocol and transmitted across the traffic channel from the radio implementing the Project 25 conventional system protocol to the first land mobile radio site when the traffic channel is idle,
wherein the radio data complying with the Project 25 conventional system protocol and transmitted across the traffic channel comprises at least one of user group data and location data,
wherein, in response to the at least one of user group data and location data being determined to be different from a previously stored at least one of the user group data and location data, updating the conventional land mobile radio system with the at least one of the user group data and location data determined to be different.