Matches 1 - 31 out of 31
Match Document Document Title
6894612 Monitoring method and system  
A method and system ( 10 ) for directing relief to individuals ( 11 ) requiring emergency assistance includes each individual in a building ( 20 ) carrying a respective transponder ( 12 ). The...
6804529 Trunked radio repeater communication system including home channel aliasing and call grouping  
A system for channel assignment in a trunked transmission communication system including a plurality of subscribers. A plurality of subscribers is provided home channel assignment to reduce...
6529486 Trunked radio repeater communication system  
A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for...
6519472 Trunked radio monitoring system  
A method and apparatus for passively monitoring communications in a trunked communication system. Digital messages transmitted over a control channel at a particular frequency are monitored with a...
6374115 Method and apparatus for trunked radio repeater communications with backwards compatibility  
A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for...
6038437 Call-back method in response to emergency call originating from cellular radiotelephone  
An emergency call originates from a cellular radiotelephone (20) and communicates through one of A-side and B-side cellular systems. Upon receipt of the call, the cellular radiotelephone (20) is...
5956648 Trunked radio monitoring system  
A method and apparatus for passively monitoring communications in a trunked communication system. Digital messages transmitted over a control channel at a particular frequency are monitored with a...
5937344 Call-back method in response to emergency call originating from cellular radiotelephone  
An emergency call originates from a cellular radiotelephone (20) and communicates through one of A-side and B-side cellular systems. Upon receipt of the call, the cellular radiotelephone (20) is...
5842134 Auto-alignment of clear voice and low speed digital data signals in a simulcast system  
In a wide band radio frequency (RF) simulcast communications system analog voice signals are distributed in a digitized form over high speed data channels and processed as high speed data. A...
5815799 Priority system for a wide area transmission trunked communication system  
A method and apparatus for providing priority access for users in a transmission trunked communication system, including a plurality of distributive radio network terminal (RNT) switches and a...
5805645 Control channel synchronization between DBC and Cellular networks  
A downbanded Cellular network (DBC) is provided to supplement an adjacent or coincident standard Cellular network. The control channels used by the DBC and standard Cellular network are...
5767788 Computer aided dispatch and locator cellular system  
A cellular phone type network tracks public safety workers and their vehicles for computer aided dispatching and automatic vehicle and personnel locating. A worker carried repeater unit...
5742907 Automatic clear voice and land-line backup alignment for simulcast system  
In a multiple site radio frequency (RF) simuicasting transmission system, voice and digital data distributed via multi-phase modem over "land-line" inter-site communication links from a control...
5732125 Method of capturing a control channel for calls following an emergency call  
To perform control of a mobile telephone system which uses a dedicated control channel type multichannel access system, when an emergency telephone call is made from a mobile telephone to the...
5613196 Method and apparatus for a distributive wide area network for a land mobile transmission trunked communication system  
A land mobile transmission trunked communication system is provided with a unique switching protocol arrangement among repeaters that are networked to one or more external communication networks....
5594761 Control channel timing detection and self correction for digitally trunked simulcast radio communications system  
A control channel timing monitor for a simulcast radio frequency (RF) digitally trunked mobile radio communications system continually monitors the outbound control channel timing of each of plural...
5566388 RF trunking multisite switch configuration and diagnostics interface  
In a multisite radio frequency (RF) signal transmission system, a multisite switch routes audio and data information throughout the system. This switch has a node through which a system manager and...
5548802 Method and apparatus for a remote network switch for a land mobile transmission trunked communication system  
A method and apparatus for distributively interconnecting a plurality of land mobile trunked transmission communication systems into a wide area network includes a plurality of distributive radio...
5542100 Mobile communication system  
A cellular communication system includes a mobile station with a switch or button which, when actuated by the user, calls a predetermined party. In the case of an emergency, the user actuates this...
5517680 Self correction of PST simulcast system timing  
Arrangements are disclosed for maintaining time synchronization of simulcast radio frequency communications system transmissions. A circuit continually instructs a modem to use the common system...
5477539 Narrow band simulcast system having low speed data distribution  
A "narrow band" public service trunking (PST) simulcast radio frequency transmission system having high-speed and low-speed digital data access capabilities in addition to analog voice operates in...
5465386 Signaling protocol for a distributive wide area transmission trunked communication system  
A land mobile transmission trunked communication system is provided with an enhanced control signal protocol. The land mobile transmission trunked communication system includes a plurality of...
5410740 Control of a radio communications system base station  
In a radio communications system having at least one base station, the base station including a plurality of transceivers, a control method and apparatus includes the steps of comparing the number...
5287542 Method to expand an audience in a communication system network  
A central controller of a communication system network may more efficiently expand an audience of a communication in the following manner. When a communication unit of a first communication group...
5212724 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5206863 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5203015 Automatic channel selection in a mobile radio for telephone interconnect  
A mobile radio programmed to analyze idle channel assignments issued by a repeater station and select different channels, if appropriate, which are especially adapted for communicating with other...
5146214 Paging signal control system with reduced power consumption in a mobile communication system  
Mobile stations are classified into a first grouped station which is portable, and a second ungrouped station which is carried by a vehicle. A grouped station receives a part of the time slots of a...
5128930 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5020132 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5014314 Method for developing and transmitting usage context information in an RF communication system  
In an RF communication system, a method for developing and communicating usage context information. When an inbound communication (110) is received from a communication unit (107), a repeater (101)...
Matches 1 - 31 out of 31