Systems and methods for broadband failover in land mobile radio networks

A converged communication device comprising:

• a first communication interface configured to communicate with a land mobile radio (LMR) network using a first communication modality, the first communication modality being a land mobile radio (LMR) modality;
• a second communication interface configured to communicate with a broadband network using a second communication modality, the second communication modality being a non-land mobile radio broadband modality;
• and
• an electronic processor coupled to the memory, the first communication interface, and the second communication interface, and configured to
• operate the converged communication device using the first communication modality to execute a first communication between the converged communication device and the land mobile radio (LMR) network,
• determine a plurality of radio communication characteristic values for each of a plurality of sites of the land mobile radio (LMR) network,
• generate a fallback threshold for a home site of the converged communication device based on the plurality of radio communications characteristics;
• for each of the plurality of sites, generate a return threshold based on the plurality of radio communications characteristics;
• determine whether a current radio communication characteristic value associated with a home site of the converged communication device exceeds the fallback threshold,
• when the current radio communication characteristic value does not exceed the fallback threshold, operate the converged communication device using the second communication modality to execute a second communication between the converged communication device and the broadband network;
• while operating the converged communication device using the second communication modality,
• control the first communication interface to scan the plurality of sites to determine a second plurality of radio communication characteristic values;
• for each of the plurality of sites, determine, based on the second plurality of radio communication characteristic values, a service quality rating;
• select, from the plurality of sites, a potential return site based on the service quality rating;
• and
• when the received signal strength intensity for the potential return site exceeds the return threshold for the potential return site, operate the converged communication device using the first communication modality.