Patent ID: 7783316

Claim:
A public safety communications network using asymmetric channels for receiving requests for data from a mobile client over a narrowband channel and delivering requested data over a wideband channel to the mobile client said network comprising: a land mobile radio system (LMRS) for providing the narrowband channel for requesting the data; an emergency operations center (EOC) connected to the LMRS and for receiving and processing the data requests and forwarding the requested data; a terrestrially broadcast high definition digital television (DTV) station transmitter for providing the wideband channel and connected to the EOC and for delivering the requested data over the wideband channel; a DTV datacast receiver located with the mobile client for receiving the requested data from the terrestrially broadcast high definition DTV station transmitter; and a forward error correction (FEC) regulation system for use in transmitting requested data to the mobile client wherein FEC strength is regulated as a function of historical channel performance statistics for a geographical location.