Matches 1 - 42 out of 42
Match Document Document Title
7353036 Push-to-talk reverse channel establishment  
A push-to-talk (PTT) radio resource controller ( 441 ) establishes a “reverse” channel using a forward channel resource request module ( 461 ), a reverse channel resource request module ( 463 )...
7043261 System, mobile station and method for delivering services  
A system, mobile station and method are provided for delivering services such as voice messages, voice clips, video clips and/or multimedia clips. The system includes a network entity, such as a ca...
6960999 Apparatus and methods for cellular communication  
A tag interrogation system including at least one base station and a plurality of tags, each having an awake mode and a sleeping mode, wherein each base station is operative to broadcast messages w...
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 collisi...
6751468 Systems and methods for providing push to talk feature for wireless communication systems  
Systems and methods are provided for allowing a first wireless unit and a second wireless unit to share a single communication channel including a transmit frequency and a receive frequency. The sy...
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 interco...
EP0681778B1 A METHOD FOR ASSIGNING SPEECH ITEMS IN GROUP CALLS  
Abstract not available for EP0681778 Abstract of corresponding document: US5901363 PCT No. PCT/FI94/00034 Sec. 371 Date Sep. 18, 1995 Sec. 102(e) Date Sep. 18, 1995 PCT Filed Jan. 25, 1994 PCT Pub...
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 interco...
6151492 Method and an arrangement for setting up of connection in a telecommunication network  
6138011 Method and apparatus for providing dispatch service to an existing telephone network  
A dispatch controller (103) located logically external to an existing telephone network (101) is coupled to the existing telephone network. When an originating communication device (e.g., 111) desi...
6052599 Cellular communication system with multiple same frequency broadcasts in a cell  
In a cellular communication network, capacity in a cell is increased by placing antennas transmitting different signals on the same carrier frequency at separated locations in the cell, rather than...
6026296 Apparatus for providing dispatch service to an existing telephone network  
A dispatch controller (103) located logically external to an existing telephone network (101) is coupled to the existing telephone network. When an originating communication device (e.g., 111) desi...
6021326 Trunked multi-site dispatch network for trunking radios  
A system for networking dispatch-type of communications. A plurality of radio cells are coupled to a centralized hub controller via the public switched telephone network. The radio cells are networ...
5924041 Method and apparatus for providing a dispatch system in a cellular radiotelephone system  
A method and apparatus for providing a dispatch system in a cellular radiotelephone system. Membership in a dispatch group is implicitly created by assigning a common telephone number to all member...
5924032 Mobile telephone having an improved probability of receiving an incoming call  
A mobile station (10) includes a transceiver (14, 16) for receiving information from and for transmitting information to a control channel of a wireless communications system. The mobile station fu...
5901363 Method and apparatus for prioritizing plural requests by subscribers for speech items in a group call on a radio path  
A method implemented in a mobile telephone system in which each subscriber belonging to a group call group and wishing to speak requests a speech item through an interface to the mobile exchange. T...
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 uniq...
EP0606282B1 METHOD FOR REALISING A GROUP CALL IN A DIGITAL RADIO NETWORK  
Abstract not available for EP0606282 Abstract of corresponding document: US5594948 PCT No. PCT/FI92/00248 Sec. 371 Date Mar. 31, 1994 Sec. 102(e) Date Mar. 31, 1994 PCT Filed Sep. 22, 1992 PCT Pub...
5784388 Methods and apparatus for decoding control signals in dispatch trunked radio system  
A system for decoding encoded data from the control channel of a trunked dispatch system, and for detecting the presence of subaudible handshake data on an assigned voice channel of the trunked dis...
5705980 Method and apparatus for summoning police or security personnel for assistance in an emergency situation  
Security officers (38) can be summoned to help a person (28) in distress, by providing portable pagers (40) to a group of officers assigned to a protected area (26). A person entering the area carr...
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. T...
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 n...
5544159 Duplex interconnect/dispatch trunked radio  
A subscriber unit for use with a duplex communication system is described. The present invention contemplates a duplex transceiver which incorporates data and voice handling capablity. A microproce...
5541976 Communications system for integrating a paging system with cellular radio telephones  
The present invention relates to a cellular mobile radio telephone system which incorporates an independent paging capability with an existing mobile telephone by taking advantage of call forwardin...
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 trans...
5432840 Method and arrangement for connecting selectively a stationary subscriber apparatus to a neighboring mobile subscriber apparatus with the aid of a telephone switchboard function  
A method and a system for connecting a stationary subscriber apparatus selectively to a mobile subscriber apparatus through a telephone subscriber exchange, which includes a call switching function...
5408466 Duplex interconnect dispatch trunked radio  
A subscriber unit for use with a duplex communication system is described. The present invention contemplates a duplex transceiver which incorporates data and voice handling capability. A microproc...
5404355 Method for transmitting broadcast information in a digital control channel  
The present invention provides a method for transmitting information on a communications channel, e.g. , a digital control channel between a base station and a mobile station in a cellular system. ...
5218629 Communication system for message display onboard mass transit vehicles  
A communication system for displaying route specific messages onboard a plurality of mass transit vehicles operating along designated routes within a geographical area serviced by a cellular teleph...
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 ove...
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 ove...
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 operatio...
4835731 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 ove...
4802235 Subscriber unit for a flexible communication system  
A communication transceiver is described which can permit operation of the transceiver unit in either the trunked dispatch mode or in the cellular mode. The ability to utilize two sets of frequenci...
4794635 Two-way radio communication system with max-minimum call assignment method  
An improved two-way radio communication system having a limited number of channels is disclosed which assigns calls in a max-minimum method, in a first embodiment according to the type of call and ...
4672601 Duplex interconnect/dispatch trunked radio system  
A dispatch trunked radio system which provides duplex or simplex telephone interconnect communications to subscriber units is described. The system allows duplex capable trunked system subscriber u...
4654867 Cellular voice and data radiotelephone system  
A data message transmission system for a cellular radiotelephone system is disclosed. Data to be transmitted is converted into a format compatible with radio transmission prior to transmission. The...
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...
4633463 Radio communication system  
A communication system, adapted particularly for use in military tactical situations, includes a plurality of central stations and at least one remote station assigned to each such central station....
4599490 Control of telecommunication switching systems  
A method and apparatus for controlling a cellular mobile telecommunication system. A switch and a telecommunication control complex cooperate to set up connection between a telecommunication networ...
4553263 Queued community repeater mobile  
A remote unit which transmits and receives messages within a fleet of remote units on a single communications channel shared by a plurality of remote unit fleets is disclosed. Access to the channel...
4553262 Communications system enabling radio link access for non-trunked radio units to a multifrequency trunked two-way communications systems  
An improved multifrequency trunked, two-way communications system is provided in which a plurality of conventional single channel radio units are provided access. The system includes a predetermine...

Matches 1 - 42 out of 42