Matches 1 - 50 out of 84 1 2 >
Match Document Document Title
7228130 Method for preventing an unauthorized device from operating in an 800 MHz trunked radio communications system using channels 319 to 0  
A receiving device in a trunked radio communications system determines a transmit frequency, wherein the transmit frequency is calculated by subtracting a voice channel number from 319, multiplying...
7171213 Method for operating in a 800 MHz trunked radio communications system for channels 440 to 559  
A receiving device in a trunked radio communications system determines a transmit frequency, wherein the transmit frequency is calculated by subtracting 440 from a voice channel number, multiplying...
7136664 Method for determining a control channel in a trunked radio communications system utilizing a scan list  
A receiving device in a trunked radio communications system retrieves a first frequency from a scan list and tunes to about the first frequency. If no control channel messages are decoded at the...
7096013 Method for operating in an 800 MHz trunked radio communications system by mapping channels to frequencies  
A receiving device in a trunked radio communications system determines transmit and receive frequencies by a mapping. The receiving device receives a voice channel number, wherein the voice channel...
7089026 Method for determining a control channel in a trunked radio communications system  
A receiving device in a trunked radio communications system retrieves a first frequency, wherein the first frequency relates to a lowest frequency that the at least one repeater utilizes for...
7085573 Method for operating in a 800 MHz trunked radio communications system for channels 0 to 119  
A receiving device in a trunked radio communications system requests a voice channel for a communication and receives an outbound signaling message on a control channel comprising a voice channel...
7027465 Method for contention free traffic detection  
The invention discloses a method for detecting priority of data frames comprising the steps of extracting (S 1 ) a bit pattern from a predetermined position in a frame, comparing (S 2, S 3 ) the...
EP0839433B1 CALL ESTABLISHMENT IN A MOBILE COMMUNICATION SYSTEM  
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...
6771697 Spread spectrum handshake for digital subscriber line telecommunications systems  
Handshake information for xDSL services is transmitted utilizing a spread spectrum modulated system where a plurality (n) of carrier tones (n>2) are summed and utilized as a spread spectrum...
6721278 Dynamic allocation of packet data channels  
In a cellular telecommunications system, a method of dynamically allocating packet data radio channels among users competing in a same cell for the channels involves determining a user ranking for...
EP0775392B1 A METHOD FOR CONTROLLING A RADIO UNIT  
Abstract not available for EP0775392 Abstract of corresponding document: US5903847 PCT No. PCT/FI94/00533 Sec. 371 Date May 2, 1996 Sec. 102(e) Date May 2, 1996 PCT Filed Nov. 29, 1994 PCT Pub....
EP0776585B1 METHOD FOR CONTROLLING SUBSCRIBER-STATIONS IN A RADIOTELECOMMUNICATIONS SYSTEM  
Abstract not available for EP0776585 Abstract of corresponding document: US5781860 PCT No. PCT/FI94/00374 Sec. 371 Date Apr. 22, 1996 Sec. 102(e) Date Apr. 22, 1996 PCT Filed Aug. 25, 1994 PCT...
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...
6370234 Public service answering point with automatic triage capability  
A public service answering point system is taught that will perform a triage on incoming calls both fully automatically and with caller interaction. The system will progressively shave out...
6138031 Call establishment in a mobile communication system  
5995849 Direct wireless communication system and method of operation  
A digital direct wireless communication system that permits direct, point-to-point communication (voice or data) between transceivers without the infrastructure associated with traditional cellular...
5963869 Method and apparatus for management of analog and digital control channels  
A system and method for directing mobile stations from an analog control channel (ACCH) to a digital control channel (DCCH). According to the present invention, a dual-mode mobile station transmits...
5953671 System and method for priority group access  
An improved trunked radio repeater system and method providing an alternative communication mechanism for contacting a dispatcher within the system when the user's assigned group is busy. Using a...
5933769 Portable telephone capable of decreasing noise  
In a portable telephone, a voice filter is connected to an antenna through a receiving circuit. A filter is connected to the voice filter through a switching circuit and filters the voice signal...
5903847 Method for controlling a radio unit  
A method for controlling a radio unit in a radio system which has at least a first radio unit and a second radio unit in which at least one of the radio units communicates on a direct mode channel....
5864762 Operating a trunked communication system in transmission and message trunked modes  
A digitally trunked radio repeater system provides substantial improvements in timeliness and reliability. The mobile radio transceivers transmit channel requests on the control channel at 9600...
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...
5806002 Method of scanning using resource analysis  
In a communication unit (105) in which a priority scan occurs, wherein priority scan comprises automatically scanning, while the communication unit (105) is unmuted to a non-priority communication...
5781860 Method for controlling subscriber stations in a radio-telecommunications system  
In a radiotelecommunications system where some of the subscriber stations are able to communication with one another on a direct mode channel, to direct subscriber stations to one and the same...
5774811 Mobile radio communication method  
The invention provides a mobile radio communication method which can transmit one or more kinds of service information determined in advance for individual mobile terminals by an interrupt to...
5771463 Method for controlling a subscriber station in a radio system  
A method for controlling a subscriber station communication on a direct mode channel in a radio system, in which at least one base station is communicating via channels, and subscriber stations. To...
5758291 Method for automatically revising a wireless communication unit scan list  
A method for automatically revising (405) a scan list (201-203) in a wireless communication unit (103-106) employs the provision of a scan list that includes talk group identifiers (202) and...
5710978 Logging recorder system for trunking radio  
A logging recorder system for trunking radio includes a device which monitors a plurality of channels of the trunking radio system and outputs analog signals representative thereof. A digitizer is...
5646606 Transmission of transmitter parameters in a digital communication system  
In a system for transmitting digital information, transmitter operating parameters (503) are transmitted with other communication message information (501, 505, 507, 509, 511, 513, 515, and 517) to...
5625890 Logging recorder system for trunking radio  
A logging recorder system for trunking radio includes a device which monitors a plurality of channels of the trunking radio system and outputs analog signals representative thereof. A digitizer is...
5619652 Automatic preemption recovery and frame repeat option in a media access control/host system interface unit  
An interface system for transferring information between a local area network and a system memory associated with a station attached to the network. The interface system includes a bus interface...
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....
5574788 Trunked radio repeater system  
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
5570411 Call priority in a mobile radiotelephone system  
Call priority is realized in a mobile radio telephone system by ascertaining that a call should be given priority, assigning channels preferentially to a priority call, assigning higher quality...
5550836 High speed data transfer over twisted pair cabling  
A method provides for a first network node in a plurality of network nodes to transmit a data packet to a hub. The hub and the network nodes are interconnected within a local network system....
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...
5542108 Method for processing communication requests  
A communication unit that is registered in a trunked communication system can continue to receive a communication from a first communication unit after initiating a push-to-talk request while the...
5535210 Method and system for resolution of channel access in data transmission systems  
A novel scheme efficiently indicates to a plurality of users which user has been granted access to a multi-access packet channel. Transmission and reception of a predetermined limited number of...
5483670 Trunked radio repeater system with control channel monitoring feature  
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
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...
5450611 Fast channel access protocol for a two-way communication system  
Requesting (transmitting) subscriber units may immediately begin transmitting an information signal over an assigned communication channel. Receiving subscriber units immediately unmute their...
5442809 Method of assigning a voice/data channel as a temporary control channel in a radio communications system  
A method is employed by a central controller of a radio communications system, which method provides for sustaining a predetermined level of communication service. The system includes a plurality...
5438610 Method for establishing a communication link between a ground-base caller and a passenger on board an aircraft  
A ground-to-air telephone calling system is provided including a computer for receiving an airborne telephone number and a call-back number from a calling party and forming the telephone numbers...
5420861 Multiplex system for sub-channels which have various priority levels  
A multiplex system having a main transmission channel (MC) for transmitting or not, within a pass-band corresponding to the information rate, information signals coming from a plurality of...
5418621 Circuit for detecting TV/radio broadcasting program, auto-tuning to channel selection and controlling VCR tape in recording operation  
Circuit for detecting TV/radio broadcasting program, auto-tuning to channel selection and controlling VCR tape in recording operation. The circuit of the invention includes a channel signal...
5408680 Single channel autonomous digitally trunked RF communications system  
A single channel autonomous trunking ("SCAT") RF repeater transmits and receives on a single duplex RF channel. The repeater operates alternately in a control channel mode and in an assigned...
5387905 Mutli-site group dispatch call method  
Processing of dispatch calls in a multi-site communication system begins when a source communication unit initiates a request for a dispatch call. The request is routed to a controller which...
Matches 1 - 50 out of 84 1 2 >