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5119502 |
Periodic system ordered rescan in a cellular communication system
A method for use in a cellular radio telephone system for controlling, in at least one mobile station, rescanning operations of paging channels in the system, wherein the mobile station is...
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5111535 |
Method and system for switching radio frequency
In a method and system in which data is time-divisionally transmitted from a plurality of base stations to a plurality of mobile subscribers at different frequencies corresponding to the base...
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5047762 |
Method and apparatus for increasing co-channel utilization in a multi-station data communications network with overlapping coverage
A digital radio system having improved co-channel utilization is disclosed. A remote terminal receives a station identification from one of the fixed stations having an overlapping radio coverage...
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4797947 |
Microcellular communications system using macrodiversity
A cellular system employing time division messages transmitted from a plurality of radiators in each cell is disclosed. A first electromagnetic signal at a particular frequency is transmitted...
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4701758 |
Individual simulcast transmitter remote control system encoder
A paging simulcast station remote control system encoder is described. The paging system encoder generates signals in accordance with a predetermined signalling scheme comprising a series of tones...
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4670906 |
Data communications system transmitter selection method and apparatus
A data communications system is described which comprises a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated co-located transmitters and...
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4661804 |
Supervised wireless security system
Apparatus and method for communication by use of a single FM radio frequency, from a plurality of transmitters to a central receiver in a security alarm system or similar system. A transmitter's...
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4644347 |
Multiple frequency message system
In the preferred embodiment the multiple frequency receiver comprises a decoder responsive to a transmitted coded message signal having a special code for designating that the message is being sent...
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4642633 |
Individual simulcast station control system
A simulcast paging transmitter remote control system capable of individual station control is described. The remote paging transmitter control system comprises an encoder and decoder which...
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4638479 |
Method of two-way radiocommunication between fixed stations and mobile stations
A method of two-way radiocommunication between fixed stations and mobile stations permitting effective utilization of available radiocommunication channels. All the fixed stations transmit in a...
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4550443 |
Method and apparatus for dynamically selecting transmitters for communications between a primary station and remote stations of a data communications system
A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of...
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4550311 |
Remote sensing systems
A security installation at one Site has remote sensors which detect intrusion, fire, etc. and transmit corresponding signals by radio to a master station. Similar installations are provided at...
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4545071 |
Portable radio for a zoned data communications system communicating message signals between portable radios and a host computer
A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of...
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4525861 |
Zoned data communications system for communicating message signals between portable radios and a host computer
A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of...
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4481670 |
Method and apparatus for dynamically selecting transmitters for communications between a primary station and remote stations of a data communications system
A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of...
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4092600 |
Installation for two-way radio communication
Two-way radio communication system with several fixed stations serviced by a fixed dispatching center and with at least one mobile station. The fixed stations transmit at different frequencies and...
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3628147 |
TIME-DIVISION MULTIPLEX MOBILE COMMUNICATION SYSTEM
A time-division multiplex mobile communication system allowing communications to be made between a plurality of railroad trains travelling on a predetermined railroad line and a central base...
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3189822 |
Switchover arrangement in a mobile radio communication system
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3155909 |
Mobile communication system in which the base station receiver, which receives the strongest signal, is automatically selected
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2896072 |
Mobile radio telephone system
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2883522 |
Mobile communication system with carrier signal strength control
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2734131 |
Title is not available
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