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Dual fallback hardened VoIP system with signal quality measurement

  • US 10,735,180 B2
  • Filed: 12/26/2019
  • Issued: 08/04/2020
  • Est. Priority Date: 12/16/2016
  • Status: Active Grant
First Claim
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1. A system for providing hardened VoIP and land mobile radio communication services to mobile devices, the system comprising:

  • a mobile device having a first primary operational state, a secondary primary operational state a first fallback state, and a second fallback state,the mobile device configuredin the first primary operational state toreceive via a cellular communications systema VoIP status signal from a controller,receive from a first land mobile radio systema first Land Mobile Radio (LMR) status signal, andprovide VoIP communication over the cellular communications system;

    in the second primary operational state toreceive via the cellular communications systemthe VoIP status signal from the controller,receive from a second land mobile radio systema second LMR status signal, andprovide VoIP communication over the cellular communications system;

    in the first fallback state toprovide voice communication over the first land mobile radio system;

    in the second fallback state toprovide voice communication over the second land mobile radio system; and

    to transition from the first primary operational state to the first fallback state upon failing to receive the VoIP status signal from the controller;

    to transition from the second primary operational state to the second fallback state upon failing to receive the VoIP status signal from the controller; and

    to transition from the first primary operational state to the second primary operational state upon failing to receive the first LMR status signal.

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