Patent ID: 8359048

Claim:
An alert broadcast method, comprising the steps of: wirelessly transmitting a first message from a first cellular communication device to a central transceiver, the first message having a characteristic identifying the first message as an alert message; determining a location of the first cellular communication device; identifying a plurality of second cellular communication devices that are within a proximity of the first cellular communication device, a first subset of the second cellular communication devices being within a first cellular network, and a second subset of the second cellular communication devices being within a second cellular network; and transmitting a second message from the central transceiver to the second cellular communication devices, the second message being dependent upon the first message, wherein the first cellular communication device is within the first cellular network, the central transceiver comprising a first central transceiver, the second cellular network including a second central transceiver, the second central transceiver relaying the second message from the first central transceiver to the second cellular communication devices within the second cellular network.