Matches 601 - 647 out of 647 < 1 2 3 4 5 6 7 8 9 10 11 12 13
Match Document Document Title
5123110 Channel assignment method for multi-site trunked radio system  
A method for allocating communication resources within a communication system wherein communication resources are assigned only within critical sites and within non-critical sites containing...
5103445 Method of adapting a mobile radio communication system to traffic and performance requirements  
A method in a mobile radio communication system for adapting the system and communication to prevailing traffic and performance requirement. According to the invention a mobile station inserts...
5101502 Wide area trunked channel busy override  
A typical multi-site trunked communication system comprises communication units that are arranged into talk groups, communication resources distributed among communication sites, and a...
5101407 Multiple-access communications system  
A multiple access communications system for use between a base and a plurality of substations and having a first channel for transmission of data from the base to the substations and a second...
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...
5086507 Drop channel pre-alert for trunked radio communication system  
To help prevent call bridging and increase the reliability of channel de-assignment in a trunked radio repeater system, the working channel sends a drop channel "pre-alert" message to on-channel...
5060296 Communication system with squelch control  
A trunked communication system (100) wherein an EOT (308) as transmitted by a communication unit (103) is used by the system to initiate a squelch methodology, but is not used by the resource...
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...
5054111 HF data communications system with network management  
A method of network management for a radio communications network comprising a plurality of stations each of which includes a transceiver and control means therefor, the transceiver and control...
5050234 Method for connecting a channel between a base station and a mobile station  
A radio communication system comprises a plurality of subsystems each including a base station and a mobile station. A connection is to be allowed between the base and mobile stations in a...
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...
5034993 Method for allocating communication resources among RF communications systems  
A method for allocating RF communication resources among RF communication systems. This allocation may be base strictly upon demand or it may be based upon the loading of an RF communication system...
5025254 Communication system with improved resource assignment  
A trunked communication system wherein some of the communication resources are preassigned for exclusive use only by a predetermined group, such as a public safety agency. In addition, to assure...
4998290 Frequency-hopping radio communication network  
A system for effecting radio communication over a given range of frequency channels among a plurality of participating local stations, includes: a variably settable channel transmission unit at...
4995097 Radio system to allow for exchanging messages between a set of stations  
A radio system allows for exchanging messages between a set of relay stations (R1, R2, R3 . . . ) and mobile access stations (M . . . ) for communications. At least one common semaphore channel is...
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...
4837858 Subscriber unit for a trunked voice/data communication system  
A trunked voice/data subscriber is provided that operates in either a voice mode, or one of three data modes. In a first data mode, the voice/data subscriber monitors the voice control channel to...
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...
4680583 Terminal address assignment in a broadcast transmission system  
In a broadcast transmission system, in which in normal operation messages and terminal addresses are transmitted between a master station and a plurality of terminals each having an assigned...
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...
4658435 Radio trunking system with transceivers and repeaters using special channel acquisition protocol  
An arrangement for establishing communication between a first mobile radio transceiver and a second mobile radio transceiver through a repeater over a radio frequency channel selected from a...
4654879 Cellular mobile radio subscriber location detection  
The locating function of a cellular mobile radio telephone system is implemented so that, when the locating radio detects a sustained change from a very low signal quality or amplitude (indicating...
4646345 Automatic unit ID for quasi-transmission trunked systems  
The system requires the use of the permanent ID of the requesting unit in every channel request made on a control channel before every transmission. The channel grant will include the ID along with...
4618998 Radio communications control system which automatically returns the system to the speech channel  
A radio communications system having a call channel and a plurality of speech channel one of which is to be selected, is provided with means for returning to a last used speech channel in the event...
4573207 Queued community repeater communications system  
A communication system which controls access to a single communications channel by a plurality of remote units arranged in predetermined groups is disclosed. Assignment of the channel is controlled...
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...
4519069 Communication system interconnecting radios and operators located at different positions  
A communication system using a control bus and an audio bus to interconnect operator positions and radio positions. Each position is allocated, by a timing circuit, time slots on the control bus...
4477809 Method for random-access radio-frequency data communications  
A method for random-access data communications to and from a central controller, from and to at least one of a plurality of remote stations, by providing at least one radio-frequency channel having...
4345334 Reduced-cross talk telemetry system and method of manufacture thereof  
Method and apparatus for providing a multi-channel telemetry system in which the fundamental frequencies of the transmit-receive channels of the system are selected from a series of tentative...
4090036 Satellite communications system  
A satellite communications system provides automatic channel assignment without employing a dedicated signalling channel. A major station detects carrier-free forward channels and transmits on each...
4009347 Modular branch exchange and nodal access units for multiple access systems  
Modular digital exchanges linked by earth satellite provide coordinated time division switching and time compressed communication services relative to externally attached telephone and data (user)...
3806804 RADIO TELEPHONE SYSTEM HAVING AUTOMATIC CHANNEL SELECTION  
This invention relates to an automatic radio telephone system for a large number of users who are not restricted in their geographical locations within a localized area, which automatically...
3786199 MIXED TRAFFIC MOBILE RADIO SYSTEM  
In order to merge telephone traffic and dispatch traffic into a common network without degrading either type of service over that enjoyed in separate systems, dispatch type traffic is somewhat...
3688195 NORMALLY SILENT MOBILE RADIO TELEPHONE SYSTEM  
A mobile radio telephone system is provided in which a "radio hush" condition prevails as long as there is no call or current conversation. The mobile sets are tuned in a standby position to a...
3634627 CHANNEL-ALLOCATION SYSTEM FOR A CHANNEL-ADDRESSING MULTIPLE-ACCESS TELECOMMUNICATION SYSTEM  
In a channel-addressing multiple-access telecommunication system, a channel-allocation system is disclosed in which all stations scan the available channels. An available channel is seized by...
2686256 Signal transmission system  
2680154 Arrangement for single-channel time sharing  
2670435 Radiotelephone communication system  
2649541 Radiant energy signaling station  
2458558 Radiotelephone equipment  
2383908 Radio telephone system  
2176868 Radio communication system  
1917995 Radio telephony  
1889292 Radio signaling system  
1758570 Electrical communicating system  
1754881 Radio trunk system  
Matches 601 - 647 out of 647 < 1 2 3 4 5 6 7 8 9 10 11 12 13