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| Number | Title | Issue Date |
| 5375254 | Method of operating a communications system, a communications system and a secondary station for use in the system A communications system, such as the DECT, comprises a plurality of geographically separate primary stations and a plurality of secondary stations which are able to roam relative to the primary stations. Communication between a primary and a secondary sta... | 12/20/1994 |
| 5263177 | Modified simulcast communication system In simulcast systems, overlapping coverage areas (111, 113, 115, and 117) of base sites (101, 103, 105, and 107) result in distortion of the received signal to any communication unit (121 and 125) within the overlapping area. This distortion occurs becaus... | 11/16/1993 |
| 5249303 | Continuous reception by a mobile receiver unit of program channels transmitted by a series of transmitters A system and process for continuous reception of information by a mobile receiver unit passing among a plurality of spaced transmitters with each transmitter configured to individually transmit signals to the mobile receiver unit. The mobile receiver unit... | 09/28/1993 |
| 5212806 | Distributed control methods for management of migrating data stations in a wireless communications network In a wireless communications network having a plurality of header stations (12) in bidirectional wireless communication with one or more mobile communication units (10), a method of managing ownership of the mobile units. In accordance with the method the... | 05/18/1993 |
| 5212807 | Method of automatic path map generation for simulcast transmission system A method of automatic path map generation (600) for use in a simulcast transmission system is disclosed which has at least three transmitter sites which form a first communication loop (403). The first communication loop has at least a first and a second ... | 05/18/1993 |
| 5212803 | Method for reducing equalizer usage in mobile radio communication systems A method in a mobile radio station to select one of a number of dedicated control channels (DCCH1-21) which are transmitted from a number of base stations (B1-B21) in a mobile radio system. In the mobile station there is an equalizer to compensate for the... | 05/18/1993 |
| 5196842 | Pager capable of operating in multiple paging systems A pager (400) capable of operating in a plurality of paging systems (210, 212, and 214) includes a receiver (404) for receiving information messages which include idle words from one of the paging systems. Upon receiving the information messages the pager... | 03/23/1993 |
| 5187808 | Repeater site failure detector in communication system A communication unit (114) operates in a communication system (100). The communication unit (114) communicates with a central communication controller via one of a plurality of a communication controllers (104, 108, or 112) that transmits information sign... | 02/16/1993 |
| 5181200 | Handoff method and apparatus for mobile wireless workstation In response to a data processor (10) breaking a wireless link with a first, original, link adapter (12) a first step deletes the data processor from an active group of the first link adapter and re-directs network datagrams intended for the data processor... | 01/19/1993 |
| 5157709 | Radio communications system adaptively assigning channels using power levels of idle channels In a mobile radio communications system comprising a control station and base stations, each base station is capable of sensing power levels of signals received on idle channels. In response to a polling signal periodically sent from the control station, ... | 10/20/1992 |
| 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 critical users. A central controller checks the critical site li... | 06/16/1992 |
| 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 operationally connected to at least one base station. The method i... | 06/02/1992 |
| 5111535 | Method and system for switching radio frequency In a method and system in which data is time-divisionally transmitted from a plurality of base stations to a plurality of mobile subscribers at different frequencies corresponding to the base stations, a given mobile subscriber switches a reception freque... | 05/05/1992 |
| 5047762 | Method and apparatus for increasing co-channel utilization in a multi-station data communications network with overlapping coverage A digital radio system having improved co-channel utilization is disclosed. A remote terminal receives a station identification from one of the fixed stations having an overlapping radio coverage area with another fixed station and retransmits this statio... | 09/10/1991 |
| 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 during one time slot from one of the plurality of radiators. A ... | 01/10/1989 |
| 4701758 | Individual simulcast transmitter remote control system encoder A paging simulcast station remote control system encoder is described. The paging system encoder generates signals in accordance with a predetermined signalling scheme comprising a series of tones and timed pauses and generated in response to control sign... | 10/20/1987 |
| 4670906 | Data communications system transmitter selection method and apparatus A data communications system is described which comprises a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated co-located transmitters and receivers, and a plurality of portable radios. Message sign... | 06/02/1987 |
| 4661804 | Supervised wireless security system Apparatus and method for communication by use of a single FM radio frequency, from a plurality of transmitters to a central receiver in a security alarm system or similar system. A transmitter's radio frequency signal is modulated in wide frequency swings... | 04/28/1987 |
| 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 on the local frequency and which is also responsive to th... | 02/17/1987 |
| 4642633 | Individual simulcast station control system A simulcast paging transmitter remote control system capable of individual station control is described. The remote paging transmitter control system comprises an encoder and decoder which interface with a paging terminal and transmitter respectively. The... | 02/10/1987 |
| 4638479 | Method of two-way radiocommunication between fixed stations and mobile stations A method of two-way radiocommunication between fixed stations and mobile stations permitting effective utilization of available radiocommunication channels. All the fixed stations transmit in a first radio path of multiplexed communication channels and al... | 01/20/1987 |
| 4550443 | Method and apparatus for dynamically selecting transmitters for communications between a primary station and remote stations of a data communications system A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitte... | 10/29/1985 |
| 4550311 | Remote sensing systems A security installation at one Site has remote sensors which detect intrusion, fire, etc. and transmit corresponding signals by radio to a master station. Similar installations are provided at other Sites. The sensors of each Site precede their data signa... | 10/29/1985 |
| 4545071 | Portable radio for a zoned data communications system communicating message signals between portable radios and a host computer A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitte... | 10/01/1985 |
| 4525861 | Zoned data communications system for communicating message signals between portable radios and a host computer A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitte... | 06/25/1985 |
| 4481670 | Method and apparatus for dynamically selecting transmitters for communications between a primary station and remote stations of a data communications system A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitte... | 11/06/1984 |
| 4092600 | Installation for two-way radio communication Two-way radio communication system with several fixed stations serviced by a fixed dispatching center and with at least one mobile station. The fixed stations transmit at different frequencies and the mobile station at one frequency. The mobile station co... | 05/30/1978 |
