Matches 1 - 50 out of 71 1 2 >
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...
7203318 Secure transmission system for a digital trunked radio system  
A security system for a digital trunked radio system having a digital control channel and a plurality of working channels, wherein said working channels are assigned for temporary use of individual...
7035646 Cordless cellular system  
A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency...
7006482 Apparatus and method for gating data on a control channel in a CDMA communication system  
A method for transmitting control data on a downlink and/or uplink channel in a base station and/or mobile station in a mobile communication system. In one embodiment, the base station determines...
6950653 Scanning tone remote adapter for land-mobile radio dispatch for use with dispersed dispatch stations  
A land mobile radio dispatch system is provided, which comprises a radio, one or more remote dispatch devices, and a scanning tone remote adapter connected to the radio and the remote dispatch...
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...
EP1458152A2 Dynamic Configuration of Radio Link Protocol in a Telecommunications System  
A method and apparatus for dynamically configuring parameters of the radio link protocol layer in a telecommunications system. The method and apparatus allows dynamic configuration of the radio...
6735432 Cordless cellular system and method  
A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency...
6681118 Method of providing cellular and landline cordless service using a dual mode mobile telephone  
A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency...
6611692 Cordless cellular system  
A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency...
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...
6507737 Method for automatically monitoring continuity and integrity of communication trunks  
Method for automatically determining whether a communication trunk is operating properly without having to take the trunk out of service and without the need of a craftsperson to initiate the...
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...
6333937 Access retry method for shared channel wireless communications links  
Each remote station in a wireless network cell that uses a collision oriented multiple access scheme, counts the number of retries attempted to gain access to the base station for a particular...
6169880 Method and system of load sharing and prioritization of radio repeaters  
A radio communication system assigns one repeater the role of priority repeater, whereupon that priority repeater exclusively relays all messages between one or more portable radios and a base...
6081720 Method and apparatus for allocating shared communication channels  
A method and apparatus for allocating shared communication channels between a voice transceiver segment and a data/CDPD transceiver segment of a cellular radio communication system incorporating a...
6047160 Transportable base station for a trunked radio communication system  
A base station is configured to facilitate its rapid deployment to provide trunked radio communication system. The base station includes a receiving section and a transmitting section functioning...
6044265 Methods and apparatus for cellular set programming  
A method for programming a cellular set over a control channel may be used to update data stored within a cellular set by having the cellular set search the control channel for data updates that...
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...
5930723 Establishing an expanded group call in a mobile communication system  
For establishing an expanded group call in a mobile communication system which has group call groups formed by a plurality of mobile stations, a network infrastructure which has at least one...
5884180 Method of providing a delayed connection announcement to a mobile subscriber within a radio telecommunication system  
A method is disclosed for alerting a mobile subscriber within a radio telecommunication system to wait for the connection of an incoming call which may have a delayed connection time due to network...
5875211 Multisite radio system with false mobile radio signalling detection  
In a digitally trunked radio repeating system that may include several radio site repeating transceivers, a site area identification coding system to ensure that transmissions intended for one site...
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...
5857144 In-band vehicular repeater for trunked radio system  
A vehicular repeater system communicates with a portable mobile radio using the same RF communication band and digital trunking protocol that it communicates with a base site. The repeater station...
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...
5826198 Transmission of data over a radio frequency channel  
An improved system for the transmission of data over a cellular telephone channel is provided. The system is especially adapted to reduce the cost associated with cellular telephone calls by...
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...
5805976 Single site, split location trunked radio communications system  
Base stations located at physically separate, remote locations are operated as a single site to permit trunked radio communications between portable radios located at those split sites. A first...
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...
5790638 Signaling in call transfer calling operations to control the initiation of secondary number telephone service features  
Responsive to an incoming call made to a primary telephone number subscribing to a call transfer calling service feature, a first switching node queries a data base to retrieve at least one...
5761240 Method and apparatus for determining an optical communications channel without loss of channel messages on a current communications channel  
A method and apparatus are provided for determining the fidelity of one or more communications channels with high efficiency and resolution with particularly advantageous application to digital...
5752198 Single site, split location trunked radio communications system  
Base stations located at physically separate, remote locations are operated as a single site to permit trunked radio communications between portable radios located at those split sites. A first...
5689801 Power monitoring system for a single site, split location trunked radio communication system  
Base stations located at physically separate, remote locations are operated as a single site to permit trunked radio communications between portable radios located at those split sites. A first...
5659881 Distributed method of call arbitration in an RF trunking multisite coordinator architecture  
A method for resolving talk group call contention in a multi-site trunked radio frequency communications network is accomplished in a distributed manner by utilizing autonomous call arbitration...
5650995 Console dispatch in an extended multisite radio communications network  
In an extended overall radio communications network, one or more dedicated Network Interface Modules (NIMs) are provided in each multisite trunked communications systems to permit 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....
5594948 Method for realising a group call in a digital radio network  
A method for realizing a group call in a digital radio network wherein a plurality of mobile subscribers participating in the group call roam within the area of at least one base station....
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...
5579339 Method for concurrent monitoring of multiple communications  
A communication unit (103) transmits a concurrent monitoring request to a base station (102). Responsive to the concurrent monitoring request, the base station provides multiple communications from...
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...
5568511 System and method for radio disconnect and channel access for digitized speech trunked radio systems  
In half-duplex, trunked digitized voice communications between mobile transceivers, the present invention minimizes time delays occurring after one transceiver ends a transmission and before other...
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...
5537684 Method for a communication unit to influence communication resource allocation  
A communication unit (105) may influence communication resource allocation within a communication system in the following manner. A list of pending communication requests intended for the...
5526376 Intelligent repeater interface  
An intelligent repeater interface (101) connected to a non-intelligent repeater (102) is used to control trunked communications at a trunked communication site in a trunked communications system....
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...
5513378 Maintaining communications after control breaks in a trunked communication system  
In a trunked communication system with a number of repeaters (101, 103, 105, 107), allocation of communication resources within each coverage area is controlled by one of the repeaters, which acts...
5479403 Communication apparatus  
A data communication apparatus includes a transmitter that is operable in either a memory transmission mode, wherein data converted by a data converter is transmitted to a destination, or in...
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...
Matches 1 - 50 out of 71 1 2 >