Matches 101 - 147 out of 147 < 1 2 3
Match Document Document Title
5203011 Method and apparatus for establishing voice and tone signalling communication in a trunked system  
A communication system (100) is provided comprising a communication resource controller (110) wherein the likelihood of success for establishing synchronous digital communication with a...
5200954 Communication link between multisite RF trunked network and an intelligent dispatcher console  
A communication link for a dispatcher console to a multisite network of RF digitally trunked radio site transceivers and other dispatcher consoles. The communication link provides the dispatcher...
5189734 Cellular radio system  
A cellular radio system in which a base station (BS1) establishing two way communication with a mobile (10) requests base stations (BS2 to BS7) of a subset of adjacent cells to reserve a channel so...
5179720 Method and apparatus for extended coverage of a trunked radio communications system  
A trunked radio system range extender extends the range of a trunked radio system by having a second repeater station monitor the control channel for the trunked radio system detect and decode...
5175866 Fail-soft architecture for public trunking system  
A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During...
5159701 Method and apparatus for a distributive wide area network 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...
5159695 Communication system to communication system communication system  
Independent communication systems are provided with additional receivers that allow the systems to monitor one another's outbound control signalling channels. Secondary control signalling can be...
5152002 System and method for extending cell site coverage  
A system and a method for extending coverage of a cell site in a cellular radio telephone system include a plurality of repeaters or boosters which are spaced through the region where increased...
5133081 Remotely controllable message broadcast system including central programming station, remote message transmitters and repeaters  
A remotely controllable message broadcast system includes a Central Programming Station, and many Remote Message Transmitters and repeaters. The Central Programming Station includes a library of...
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...
5125102 Trunked radio repeater system including synchronization of a control channel and working channels  
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...
5119375 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels  
A system and method for the wireless transmission of information signals between a base station and a plurality of subscriber stations. The method may include a base station receiving an...
5117501 Dynamic regrouping in a trunked radio communications system  
In a trunked radio frequency communications system, a dynamic regrouping scheme includes an effective user interface, automatic support of multi-site systems, the capability to program individual...
5109543 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
5095529 Intersystem group call communication system and method  
Communication systems having dedicated communication resources are provided with receivers that monitor the communication resources of other communication systems, and roamers are preregistered in...
5095528 Repeater with feedback oscillation control  
An apparatus for detecting excessive output power from a cellular radio telephone system booster includes input circuitry for receiving incoming radio frequency signals from a mobile source....
5086506 Radio trunking fault detection system with power output monitoring and on-air monitoring  
A trunked radio frequency (RF) repeater system for public service trunking (PST) or the like includes a fault detection system having an RF output power monitoring, over-the-air RF monitoring and...
5077828 RF channel expansion in a trunked radio communications system  
In a trunked radio frequency communications system, an arrangement dynamically "expands" or extends the frequency allocation table stored within the "personality" defining non-volatile storage...
5060240 Simulcast system and channel unit  
A simulcast broadcast uses digital signal processing techniques to scale pulse coded modulation samples of a signal for broadcast. Samples are adjusted to fully utilize all quantization levels...
5058199 Inter-truncked radio systems bridge protocol  
A radio signal relay system for use with dispatch communication systems is disclosed. The radio signal relay system includes a linking device constructed with a first and a second full duplex...
5040238 Trunking system communication resource reuse method  
Reusing radio frequency specta in a trunked radio system by establishing small cell trunked radio systems within a large cell trunked radio system wherein low power radio transmission occurs...
5038398 Method of assigning communication links in a dynamic communication network  
A method of assigning communicaton links in a dynamic communication network, such as a network of earth orbiting satellites arranged, for example in three constellations. The assignments are made...
5018187 Mobile telephone intrasystem and intersystem enhanced handoff method and apparatus for limiting trunk switching connections  
A method and apparatus to minimze the number of connecting trunks and MTSOs is operative to minimize the number of tandem MTSOs involved in handing the call by determining if the target MTSO has...
5010583 Repeater for a wide area coverage system  
A repeater for a wide area coverage multiple repeater system (100) includes a receiver (220) and a transceiver (230). The receiver (220) receives a received signal from a portable or mobile...
5003617 Simulcast broadcasting system and method  
A simulcast broadcast system wherein two signals (103 and 106) intended for simultaneous broadcast are transmitted from a source site (100) to remote sites (200) discrete from one another. At the...
4939746 Trunked radio repeater system  
A digital 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 a...
4926496 Method and apparatus for infrequent radio users to simply obtain emergency assistance  
A digital mobile radio transceiver allows even the most unsophisticated user to simply and easily obtain emergency communications. The transceiver is programmed with "personality" data specifying...
4905302 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...
4905234 Apparatus and method for transmitting digital data over a radio communications channel  
A digital radio RF signalling protocol communicates either digitized voice or digital data signals and indicates the type of information being communicated to the receiver. Multiple repeats of...
4903262 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
4870408 Method for dynamically allocating data channels on a trunked communication system  
Disclosed is a method to dynamically allocate a number of data channels on a trunked radio system (100). The data activity is monitored during a predetermined time interval. If activity is above a...
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...
4833701 Trunked communication system with nationwide roaming capability  
Selected regional trunking systems are equipped with telephone interconnect capability and provided with local computers (106), which communicate with a national hub computer (110). At each...
4831373 Method for dynamically allocating data channels on a trunked communication system  
Disclosed is a method to dynamically allocate a number of data channels on a trunked radio system (100). The data activity is monitored during a predetermined time interval. If activity is above...
4821292 Adaptive limiter/detector which changes time constant upon detection of dotting pattern  
A limiter/detector which takes advantage of the characteristics of the dotting pattern preceding each message in the General Electric Public Service Trunking System shortens bit synchronization...
4815044 Seismic signal transmission system using relay radios  
A system is provided for radio transmission between a central control and recording laboratory and spaced apart acquisition boxes in which relay transmission units are used for communicating with...
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...
4759051 Communications system  
In a cellular radiotelephone system, a geographical area is divided into radio zones, each of which comprises a cell set, and a plurality of transponders which relay signals from portable units to...
4750036 Interactive television and data transmission system  
A spread spectrum system provides bidirectional digital communication on a vacant television (TV) channel for simultaneous use by more than 75,000 subscribers using time and frequency division...
4747160 Low power multi-function cellular television system  
A multi-function cellular television system includes transmitting antennas located in an array such that the transmitted signals of adjacent antennas are of substantially differing polarity. The...
4737978 Networked cellular radiotelephone systems  
Adjacent cellular systems (101-103) are interconnected to form a network providing telephone coverage to mobiles located throughout their combined coverage areas (111-113). Each networked cellular...
4730310 Terrestrial communications system  
A terrestrial radio system which utilizes spot beams, time division multiple access and frequency reuse to provide communications services from a base station to remote customers within a system...
4718109 Automatic synchronization system  
An improved synchronization system for use with simulcast transmission systems is described. The invention provides a method and means for keeping the information signals for adjacent transmitters...
4718108 Improved multiple site communication system  
Disclosed is a communication system of the type adapted to communicate a message substantially simultaneously between a plurality of fixed location sites having respective radio coverage areas. The...
4709401 Method of setting radio transmitters for synchronous radio transmission  
In a radio paging system wherein paging calls are initiated by a central radio station and sent over lines to subordinate radio stations for transmission to paging devices, the subordinate stations...
4698805 Console interface for a trunked radio system  
A console interface for a trunked communication system is disclosed wherein unique interface modules are coupled to the central controller and console network to establish communication...
4675863 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels  
A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber...
Matches 101 - 147 out of 147 < 1 2 3