Nationwide communication system
First Claim
1. A mobile transceiver unit for transmitting messages to and receiving messages from a network comprising:
- input means for allowing a user to input a user message to the unit;
transmitter means for transmitting a radio frequency signal including the user message from the mobile unit to the network;
receiver means for receiving radio frequency signals having a message from the network;
signal detector means for detecting a noise signal at approximately 400 Hz generated by an aircraft;
means for determining whether the detected noise signal exceeds a predetermined threshold; and
a circuit for disabling the transmitter means upon the determining means determining that the detected noise signal exceeds the predetermined threshold, thereby preventing unwanted radio frequency transmission.
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Accused Products
Abstract
A two-way communication system for communication between a system network and a mobile unit. The system network includes a plurality of base transmitters and base receivers included in the network. The base transmitters are divided into zonal assignments and broadcast in simulcast using multi-carrier modulation techniques. The system network controls the base transmitters to broadcast in simulcast during both systemwide and zonal time intervals. The system network dynamically alters zone boundaries to maximize information throughput. The preferred mobile unit includes a noise detector circuit to prevent unwanted transmissions. The system network further provides an adaptive registration feature for mobile units which controls the registration operations by the mobile units to maximize information throughput.
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Citations
6 Claims
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1. A mobile transceiver unit for transmitting messages to and receiving messages from a network comprising:
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input means for allowing a user to input a user message to the unit; transmitter means for transmitting a radio frequency signal including the user message from the mobile unit to the network; receiver means for receiving radio frequency signals having a message from the network; signal detector means for detecting a noise signal at approximately 400 Hz generated by an aircraft; means for determining whether the detected noise signal exceeds a predetermined threshold; and a circuit for disabling the transmitter means upon the determining means determining that the detected noise signal exceeds the predetermined threshold, thereby preventing unwanted radio frequency transmission. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification