Simulcast data communications system

A communications system for communicating a data message having a time of transmission appended thereto via a radio frequency (RF) channel to a subscriber radio operable on the RF channel and located anywhere in a geographical area, said communications system comprising:

• a plurality of base station radios each operable on the RF channel for covering a portion of the geographical area;
• a plurality of base station controllers each including clock means, each base station controller coupled to its clock means and a corresponding one of the base station radios for receiving a set-clock message from the RF channel, each of said base station controllers resetting its clock means in response to the set-clock message, and each of said base station controllers coupled to its clock means and its corresponding one of the base station radios for transmitting the data message on the RF channel at the time of transmission appended thereto;
• a network controller including clock means and a control station radio operable on the RF channel, said network controller coupled to the clock means for generating periodically the set-clock message and generating the data messsage and appending thereto a time of transmission, and said network controller coupled to the control station radio for transmitting the set-clock message on the RF channel;
• and
• a plurality of communications links each coupling a corresponding base station controller to the network controller.

A simulcast communications system for simultaneously communicating from multiple sites a data message having a time of transmission appended thereto via a radio frequency (RF) channel to a subscriber radio operable on the RF channel and located anywhere in a geographical area, said communications system comprising:

• a plurality of base station radios each located at a different site in the geographical area and operable on the RF channel for covering a portion of the geographical area;
• a plurality of base station controllers each including clock means, each base station controller coupled to its clock means and a corresponding one of the base station radios for receiving a set-clock message from the RF channel, each of said base station controllers resetting its clock means in response to the set-clock message, and each of said base station controllers coupled to its clock means and its corresponding one of the base station radios for transmitting the data message on the RF channel at the time of transmission appended thereto;
• a network controller including clock means and a control station radio operable on the RF channel, said network controller coupled to the clock means for generating periodically the set-clock message and generating the data message and appending thereto a time of transmission, and said network controller coupled to the control station radio for transmitting the set-clock message on the RF channel;
• and
• a plurality of communications links each coupling a corresponding base station controller to the network controller.

A communications system for communicating a data message having a time of transmission appended thereto via a radio frequency (RF) channel to a subscriber radio operable on the RF channel and located anywhere in a geographical area, said communications system comprising:

• a plurality of base station radios each operable on the RF channel for covering a portion of the geographical area;
• a plurality of base station controllers each including clock means, each base station controller coupled to its clock means and a corresponding one of the base station radios for receiving a set-clock message from the RF channel, each of said base station controllers resetting its clock means in response to the set-clock message, and each of said base station controllers coupled to its clock means and its corresponding one of the base station radios for transmitting the data message on the RF channel at the time of transmission appended thereto;
• a network controller including clock means and a control station radio operable on the RF channel, said network controller coupled to the clock means for generating periodically the set-clock message and generating the data message and appending thereto a time of transmission, and said network controller coupled to the control station radio for transmitting the set-clock message on the RF channel;
• and
• a plurality of data links each coupling a corresponding base station controller to the network controller.