Two Separate Way Transmission Patents (Class 455/15)
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Patent number: 6424818Abstract: In a communication system, a communication control apparatus is disposed in a mobile object. The communication control apparatus relays information exchanged between a plurality of radio terminals carried into the mobile object and a network side. The communication control apparatus comprises a communication control server which performs establishment of a radio channel between it and a base station at the network side, and establishment of a radio channel between it and a radio terminal according to a communication request from the radio terminal, and a communication unit which performs a radio communication with the radio terminal and a radio communication with the base station, using each radio channel established by the communication control server.Type: GrantFiled: February 9, 1999Date of Patent: July 23, 2002Assignee: NTT Mobile Communications Network, Inc.Inventor: Masahiko Hirono
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Publication number: 20020072330Abstract: A Multi-Channel Redundant Wireless Network Link (RWNL) device (10) comprises plurality of wireless networking radio units, a processor unit, a radio control unit, and wired network units. Two RWNL devices communicating to each other form a multi-channel redundant wireless network communication link. The RWNL device aggrades the networking bandwidth of all its wireless networking units to become a big networking bandwidth. Network packets flow control means controls the networking packets transmitted between the wireless networking units and wired networking unit, the communication between the local wireless networking units to remote wireless networking units of the other RWNL. When the communication of one of the wireless networking channels failed to continue the communication, the flow control means will redistribute the packet flow among the remaining wireless networking radio units, shutdown the problem wireless networking channel, and report the networking status.Type: ApplicationFiled: December 6, 2001Publication date: June 13, 2002Inventor: Franklin Zhigang Zhang
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Publication number: 20020065039Abstract: The assembly comprises:Type: ApplicationFiled: November 27, 2001Publication date: May 30, 2002Inventors: Philippe Benezech, Olivier Bru
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Publication number: 20020061729Abstract: A processor unit (164) with two system buses: bus1 (161) and bus2 (162), which multiple wireless networking radio units (102, 112, 122, 132) and multiple wired networking units (165, 166, 167, 168) can be connected to. The processor unit (164) is the system-operating platform, and dose the networking functions among the networking units. A radio control unit (163) monitor and control the physical part of radio performance. Each wireless networking radio unit (102, 112, 122, 132) as long as each directional antenna (101, 111, 121, 131) will communicate with remote same type of wireless networking device and form a wireless network link. Multiple wired networking units (165, 166, 167, 168) can connect to wired network. The number and type of the wireless networking radio units (102, 112, 122, 132) and wired networking units (165, 166, 167, 168) can be selected, installed according to specific networking requirement, thus configure the hardware system of the device.Type: ApplicationFiled: November 16, 2001Publication date: May 23, 2002Inventor: Franklin Zhigang Zhang
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Patent number: 6370377Abstract: A mobile radio communication system which does not need an omnidirectional channel for both a base station and a mobile station to track each other and uses only a narrow beam channel and can reduce a tracking time than before for an adjacent base station and a mobile station to search each other while a visiting area base station and the mobile station are communicating in the overlapped area. The base station and the mobile station comprise a unit for transmitting and receiving in forward or reverse channel, in different frequency, in different tracking channel using a narrow beam. Both the mobile station and the visiting area base station search the location each other, and after searched, they assign the frequency and the beam used in the tracking channel. At the same time, by comprising a searching slot in an information channel to search an adjacent base station while communicating with the visiting area base station, a tracking of other adjacent base station can be performed.Type: GrantFiled: March 23, 1999Date of Patent: April 9, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Keijiro Take, Shuuji Itou, Toshiaki Tomisawa
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Patent number: 6370384Abstract: A novel improved frequency re-use planning which allows the most efficient bandwidth utilization and a larger coverage area in a wireless communications network utilizing translating repeaters is described. The wireless communications network has an available radio frequency bandwidth divided into a number of radio frequency communication channels. The channel assignments according to the frequency re-use plan described by this invention makes possible to achieve larger service coverage area using one or more base transceiver system, and efficient utilization of the limited bandwidth allocated to the network. According to the inventive frequency re-use planning, two adjacently located frequency channels are utilized while still meeting the signal isolation requirement between the adjacent channels by assigning the adjacent channels to cells that are remotely located from each other.Type: GrantFiled: July 29, 1999Date of Patent: April 9, 2002Assignee: Airnet Communications CorporationInventor: Michael A. Komara
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Patent number: 6351653Abstract: A cellular telephone (110) forms part of a wireless communication system (100) and has simultaneous communication of radio and cellular signals. The wireless communication system (100) has a base station (115) and one or more radios (120). The cellular telephone (110) has control circuitry (205), a cellular transceiver (215), a radio transceiver (210), a microphone (220), and a speaker (225). The simultaneous communication of radio and cellular signals permits a radio user to participate in a cellular phone call and permits a cellular telephone user to participate in the radio communication. Simultaneous communication is communication of cellular and radio signals at the same time and at substantially the same time.Type: GrantFiled: June 15, 2000Date of Patent: February 26, 2002Assignee: Motorola, Inc.Inventors: William P. Alberth, Jr., Christopher Neil Kurby
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Patent number: 6317609Abstract: A telecommunications system and method for transmitting digital images produced by a digital camera attached to or integrated with a mobile station (MS) from the MS to a receiving terminal through the Internet. A calling mobile subscriber can select the digital image to transmit and dial the number associated with the receiving terminal on the MS. The digital image is then sent in parallel through the Internet while a telecommunications connection, such as a call setup request, is being sent through the cellular or fixed network. At the end office serving the receiving terminal, the call setup request is associated with the digital image and a call connection is established between the calling MS and the receiving terminal. When the call connection is established, the end office serving the receiving terminal sends the digital image to the receiving terminal.Type: GrantFiled: December 30, 1998Date of Patent: November 13, 2001Assignee: Ericsson Inc.Inventors: Vladimir Alperovich, Eric Valentine, Walt Evanyk
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Publication number: 20010031623Abstract: An improved filter amplifier for wireless communication is provided. The filter amplifier comprises a talk-in and talk-out booster. The booster utilizes a single local oscillator to down-convert a received signal for filtering and up-convert the received signal for further amplification. A combining unit including amplifier and isolator is operable to receive the filtered signal and amplify and combine the signal. The use of isolators allows for combining signals without interference. The booster amplifier filter unit is designed for use in low reception areas including tunnels and office buildings.Type: ApplicationFiled: March 5, 2001Publication date: October 18, 2001Inventor: Lee Masoian
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Patent number: 6285857Abstract: Free-space, line-of-sight, electro-magnetic communication (i.e., via light or microwaves) is employed to provide a wide range of communication services to geographically scattered users. A relay point or end point is typically associated with each user. Each relay point receives and retransmits information via line-of-sight communication. The end points are also receivers and transmitters of information via line-of-sight communication. Although spaced from one another, the relay and end points are close enough to one another to communicate via line-of-sight links. Hard-wired connections to the users are therefore unnecessary. Broadcast radio frequency communication capability may be provided as a backup for maintaining at least some service in the event of line-of-sight communication failure or interruption. This radio capability may additionally be used to provide cellular communication service to small cells associated with the relay and end points.Type: GrantFiled: May 1, 1997Date of Patent: September 4, 2001Assignee: AT&T Corp.Inventor: Joel I. Javitt
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Publication number: 20010018328Abstract: A plurality of radio relay stations 1 are connected so that bi-directional ring-like paths are made up of radio transmission paths. The respective radio relay stations 1 bidirectionally transmit data inputted from terminals placed thereunder onto the bidirectional ring-like paths respectively. The respective data are respectively received by radio relay stations 2 having data destination terminals placed thereunder along the bidirectional ring-like paths. Each radio relay station, which has received the data destined for the terminals placed thereunder from both directions, transmits earlier incoming data to each terminal placed thereunder and discards later incoming data.Type: ApplicationFiled: February 23, 2001Publication date: August 30, 2001Inventors: Yoshinori Ohkura, Masahiro Takahashi, Hideaki Masuko, Shinichi Ueda, Takuji Hamada
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Patent number: 6243577Abstract: A first embodiment of the present invention discloses a system for extending the range of Personal Communication Services (“PCS”) band wireless local loop services. A frequency translation unit at both the user's residence and at the central hub translates the PCS signal from the PCS frequency band to the Local Multipoint Distribution System (“LMDS”) band and back. As LMDS has a significant range advantage over DECT and PHS without greatly increased costs, this frequency translation allows DECT and PHS telephones to be used over greater ranges, without the necessity of constructing a large number of cellular transceiver sites. A second embodiment of the present invention uses a frequency translation unit to permit the use of either PCS or known cellular telephones inside a user's residence without the call being routed through the more expensive cellular network. The frequency translation unit translates from PCS or cellular frequencies to LMDS frequencies.Type: GrantFiled: August 15, 1997Date of Patent: June 5, 2001Assignee: Hewlett-Packard CorporationInventors: Aly F. Elrefaie, Hans George Mattes
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Patent number: 6236840Abstract: A transmission output detecting circuit for use in a radio transmitter-receiver of a TDD communication system having a TDD switch for connecting a transmission system to an antenna system in a transmitting period and for connecting a reception system to the antenna system in a receiving period; comprising a detection means for detecting transmission output on the basis of leakage power of the TDD switch in the transmitting period. The transmission output can be detected with low power consumption without making the transmission power branch out.Type: GrantFiled: December 10, 1997Date of Patent: May 22, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yukichi Aihara, Fujio Sasaki
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Patent number: 6188875Abstract: A wireless telephone server system used for reproducing a wireless base station signal and introducing the reproduced signal in a new geographical area. The system reproduces or clones a full, high power operating cell site or cell unit of the same electromagnetic magnitude at a reduced cost. The wireless telephone system includes a parabolic collector operating in a frequency range of 140 Mhz to 2 Ghz and with a magnitude inner gain in a range of 14 to 21 dBw. A server antenna is connected to the parabolic collector using matching feedline jumpers to produce a resonant match. The server antenna is designed to provide a “under and over” null to the main lobe of the antenna at a minimum of 40 dBw. The system includes a plurality of duplexing devices with a bi-directional amplifier which allows 124 dBw of isolation between the parabolic collector and server antenna. Also, the system includes low-noise amplifiers that are adjustable from 1 to 12 dBw in system gain.Type: GrantFiled: January 17, 1998Date of Patent: February 13, 2001Assignee: R.F. Cellutions, LLCInventor: Shane Evans
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Patent number: 6128496Abstract: An arrangement of an area covering, cellular radio communication network having cell regions which can be contiguously replicated without interference. A central transceiver station is coupled to a base station controller and has a plurality of decentral transceiver stations surrounding and coupled to the central transceiver station. Groups of adjacent decentral transceiver stations are grouped in respective cell areas. All of the decentral transceiver stations in each cell area are allocated the same transmission frequencies, but the frequencies of each cell area are different from the other cell areas in the cell region.Type: GrantFiled: April 24, 1998Date of Patent: October 3, 2000Assignee: Littlefeet, Inc.Inventor: Stefan Scheinert
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Apparatus and method for selective modem communications on shared, closed-loop communication systems
Patent number: 6111663Abstract: A closed-loop communication system includes a closed-loop communication link with a shared communication channel. A set of communication devices are connected to the closed-loop communication link. Each communication device has un-arbitrated access to the shared communication channel. A responding modem connected to the closed-loop communication link includes a modem signal detection circuit to identify a modem signal on the closed-loop communication link and respond to it by facilitating a squelch disable signal. A transmission squelch circuit squelchs all transmission signals from the responding modem except when the transmission squelch circuit is disabled in response to the squelch disable signal.Type: GrantFiled: March 11, 1998Date of Patent: August 29, 2000Assignee: Dantel, Inc.Inventor: Ronald J. Dean -
Patent number: 6052591Abstract: A dialable directory number is assigned to a particular location area or cell area. A telecommunications user wanting to transmit user defined messages, such as a text message, to mobile stations within that location area or cell area transmits a signal encapsulating the message towards the assigned directory number. The transmitted signal is then routed through the conventional telecommunications network and delivered to the MSC providing mobile service to that particular location area or cell area. If the specified directory number is associated with a location area within a Public Land Mobile Network (PLMN), the serving MSC queries the attached visitor location register (VLR) to identify the mobile stations currently located within the specified location area. If the specified directory number is associated with a cell area, the serving MSC communicates with a base station controller (BSC) providing mobile service to that particular cell area.Type: GrantFiled: August 19, 1996Date of Patent: April 18, 2000Assignee: Ericsson Inc.Inventor: Ranjit Bhatia
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Patent number: 5987060Abstract: The invention provides radio communications with an up-down signal link. In accordance with the purpose of the invention, as embodied and broadly described herein, the invention is directed to a method, system and computer readable medium with program instructions (hereafter collectively referred to as "the invention"). The invention includes receiving a downstream signal in a receiver portion of an outdoor unit, producing in the receiver portion of the outdoor unit an intermediate frequency (IF) signal from the downstream signal, and processing the IF signal in the receiver portion of the outdoor unit to produce a clean line code signal.Type: GrantFiled: June 13, 1997Date of Patent: November 16, 1999Assignee: Innova CorporationInventors: Jean-Francois Grenon, Gary Allen Martek, Patric McDonald, Timothy Patrick Murphy, Colin J. R. Pallemaerts, Jerome Prismantas, F. Roland Svensson
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Patent number: 5974325Abstract: A communication system employs a method and apparatus for exchanging communicated signals between a communication unit (e.g., 17) and a central site (205). A remote base site (65) or the central site (205) determines whether a signal must be exchanged between the communication unit (17) and the central site (205). When a signal is to be exchanged, the remote base site (65) allocates a first radio frequency communication resource (75) for use in exchanging the signal between the communication unit (17) and the remote base site (65) and a second radio frequency communication resource (74) for use in exchanging the signal between the remote base site (65) and the central site (205).Type: GrantFiled: March 6, 1995Date of Patent: October 26, 1999Assignee: Motorola, Inc.Inventors: Michael D. Kotzin, Valy Lev, Stephen Lee Spear, John Stephen Ruppel
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Patent number: 5887261Abstract: A digital cellular radio communication system having a remote repeater is provided. The communication system includes a central communication site which: transmits and receives signals in a first radio channel assigned according to a cellular communication system channel reuse plan, transmits signals to and receives signals from a cellular communication network unit, and digitally processes received signals for subsequent transmission in the first radio channel or to the cellular communication network unit. The communication system further includes a remote communication site, substantially remotely located from the central communication site, which: receives a signal in either the first radio channel or a second radio channel assigned according to the cellular communication system channel reuse plan, channel shifts the received signal between the first and the second radio channels, and transmits the shifted signal in the other of the first and the second radio channels.Type: GrantFiled: September 6, 1994Date of Patent: March 23, 1999Assignee: Motorola, Inc.Inventors: John Csapo, Brian Cheng-Jean Chen, Kenneth Blake Hallman
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Patent number: 5883884Abstract: In a wireless communication system, a base unit transmits outgoing TDM signals within a base transmission coverage area at a first frequency. Repeaters in the base coverage area receive the outgoing signal and retransmit it within respective repeater coverage areas at respective frequencies, maintaining the same time slot orientation in TDM format. Several levels of repeaters form a hierarchy covering an expanded range. Remote subscriber units located in a coverage area receive the strongest outgoing frequency signal from a repeater/base unit in a time slot assigned to that unit for a particular call, which time slot is maintained for that call through successive levels of repeaters. Incoming TDMA signals from remote units use the same time slots used in received outgoing signals. The base unit transmits outgoing signals and receives incoming signals at the same frequency, but at different times.Type: GrantFiled: April 22, 1996Date of Patent: March 16, 1999Assignees: Roger F. Atkinson, Alwin C. MichaelsonInventor: Roger F. Atkinson
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Patent number: 5850593Abstract: In a mobile communication network comprising a base station (11) having a service area (13) and a plurality of mobile stations, communication is rendered possible between the base station, with a first station (15(1)) in the service area used as a repeater station, and a second station (15(2)) which may be present near or beyond a boundary of the service area. It is presumed that the mobile stations are operable with battery saving and that such a repeater station exists in a communication area (17) of the second station put into full operation. Preferably, the mobile communication network is operable with time division multiplexing, with each frame composed of a predetermined number of time slots.Type: GrantFiled: July 13, 1995Date of Patent: December 15, 1998Assignee: NEC CorporationInventor: Chikara Uratani
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Patent number: 5832365Abstract: An indoor wireless communications system using two-way active-antenna repeaters to distribute signals received from external signal sources within an office, and to extend the range of cordless phone units in use there, is disclosed. The repeaters provide menu-selectable phase-shifting, selectable receiver sensitivity and transmitter power, and selectable signal format conversion to provide added privacy and to prevent interference with communication links in use by third parties within the building. Pattern selection is done by empirical adjustment of an antenna pattern suited to the general floor plan of the area served.Type: GrantFiled: September 30, 1996Date of Patent: November 3, 1998Assignee: Lucent Technologies Inc.Inventors: Young-Kai Chen, Jenshan Lin
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Patent number: 5815799Abstract: 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 unique signaling protocol and a switching protocol especially adapted for communication of control signals in the subaudio band for interconnecting the trunked transmission communications systems into a wide area network that provides an expanded feature set of radio communications capabilities.Type: GrantFiled: August 7, 1996Date of Patent: September 29, 1998Assignee: E.F. Johnson CompanyInventors: Keith W. Barnes, Donald R. Bauman, Howard N. Brace, Philip A. Keefer, Michael E. Mihelich
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Patent number: 5781859Abstract: An RF repeater arrangement for use in a wireless telephone system has a number of handset interface parts, each provided with a transmit section for transmitting a signal to a wireless telephone handset, a receive section for receiving an off-air signal from the wireless handset and an energy detector for detecting the energy level of the received off-air signal and providing a control signal corresponding to such energy level. The control signal is employed for inhibiting the transmit section when the energy level of the received off-air signal is below a predetermined value. Thus, each handset interface part can determine when a channel is occupied and avoid transmission on that channel, so that only the geographic area around the occupied handset is subject to interference from the occupied channel.Type: GrantFiled: September 26, 1996Date of Patent: July 14, 1998Assignee: PCS Solutions, LLCInventor: Andrew Beasley
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Patent number: 5768683Abstract: A digital voice message, including a continuously embedded portable identification code, is transmitted by a portable communication unit (105) to a mobile communication unit (104) and to broadcast units (101-103). Based on the portable identification code, the mobile communication unit determines that it is associated with the portable communication unit. If, after a first predetermined period of time has elapsed, the mobile communication unit determines that the digital voice message is not being re-transmitted, in real time, by a broadcast unit (101), mobile repeater is enabled by the mobile communication unit and the digital voice message is re-transmitted as a mobile repeated message, thereby effectively extending the transmitting range of the portable communication unit.Type: GrantFiled: October 5, 1995Date of Patent: June 16, 1998Assignee: Motorola, Inc.Inventor: Keith I. Mulford
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Patent number: 5689081Abstract: In a network karaoke system, a center station transmits song data, and a plurality of karaoke terminals communicate with the center station to receive therefrom the song data so that each karaoke terminal can provide a karaoke service based on the received song data. The center station has a first transmitter that broadcasts the song data to transmit the same simultaneously to all of the karaoke terminals, and a second transmitter that responds to a request from each karaoke terminal to individually transmit the song data to each karaoke terminal. Each karaoke terminal has a first receiver that is capable of receiving the song data broadcasted by the center station, a detector that detects when the first receiver has failed to receive the broadcasted song data for communicating with the center station to notify thereto the request for re-transmission of the song data, and a second receiver that receives the song data re-transmitted from the second transmitter of the center station in response to the request.Type: GrantFiled: May 1, 1996Date of Patent: November 18, 1997Assignee: Yamaha CorporationInventor: Kanehisa Tsurumi
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Patent number: 5678176Abstract: A land mobile radio communication system has a plurality of cell sites, each of which typically has a plurality of repeaters. The over-the-air radio communications between the cell site repeaters and the mobile radios in the system include both a voice component and a data component. The data component is carried as low-frequency subaudible information. Communication channels are provided between the radio users at each site as well as between users at different sites and between mobile radio users and the public telephone network. Within a cell site, the transmitted and received communications are digitized and passed through serial buses in a time multiplex fashion. The digitized voice is transferred between time slots to provide the required switching function. The system includes operational software to provide direct inward dial telephone number recognition, automatic voice prompts for a user entering a new cell, call priority override, fraud control for radio fleets and a dynamic control channel.Type: GrantFiled: June 10, 1994Date of Patent: October 14, 1997Assignee: Uniden America CorporationInventor: Billy G. Moon
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Patent number: 5666646Abstract: The present invention relates to an improved RF converting system. The RF converting system is comprised of a plurality of RF converter modules which are configured for redundant system operation using distributed protection switching in an active "daisy chain" configuration. The "daisy chain" configuration distributes the converter protection switching functions to each individual RF converter module through a switching module coupled to each of the RF converter modules. The "daisy chain" terminates in a backup RF converter which assumes the frequency and attenuation of a faulted RF converter module. A high speed bus provides communication interface between each of the online RF converter modules and the backup RF converter module so that the backup RF converter module can detect faults and reconfigure the system to replace a failed RF converter module.Type: GrantFiled: April 10, 1995Date of Patent: September 9, 1997Assignee: ComtechInventors: Robert McCollum, Phillip Wayne Blackwell
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Patent number: 5659879Abstract: A mobile radio network comprises a base transceiver station for transmitting and receiving radio signals to and from mobiles on different basic frequencies and a radio booster for receiving, amplifying and retransmitting radio signals to and from at least one shadow area. To cover the shadow areas a radio signal received by a radio booster from the base transceiver station on a basic frequency is retransmitted to a mobile station on a translated frequency different from the basic frequency and associated with the latter by a translation law. This law is such that, firstly, each of the basic frequencies is either associated with at least one translated frequency or is not associated with any translated frequency and, secondly, the difference between the value of a translated frequency and the value of the associated basic frequency is not the same for all the translated frequencies.Type: GrantFiled: July 20, 1994Date of Patent: August 19, 1997Assignee: Alcatel N.V.Inventor: Pierre Dupuy
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Patent number: 5634190Abstract: This invention teaches the use of overlapping footprints in a LEO satellite communications system to increase the overall connectivity of the system, thus providing a wide service availability. In particular, this invention teaches the use of at least one terrestrial LEOS relay station (70) that is positioned within an overlap of at least two satellite coverage areas for relaying a communication from a gateway (18A) associated with a first coverage area to a gateway (18B) associated with a second coverage area. A plurality of LEOS relay stations can be so provided to enable a communication, such as a voice communication, to be routed through a plurality of coverage areas and gateways, thereby bypassing a substantial portion of an underlying terrestrial communication system.Type: GrantFiled: June 6, 1995Date of Patent: May 27, 1997Assignee: Globalstar L.P.Inventor: Robert A. Wiedeman
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Patent number: 5613196Abstract: 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. The land mobile transmission trunked communication system includes a plurality of transceivers for transmitting and receiving transmission trunked radio communications over one or more radio channels. The transceivers communicate with a selected one of a plurality of repeaters to establish transmission trunked radio communications on a preassigned radio channel. The unique switching protocol arangement includes a switch that is operably connected to each repeater and selectively communicates information signals between a repeater and an external communication network. A bus system is operably connected to each repeater and to the switch for communicating control signals among all of the repeaters and the switch.Type: GrantFiled: September 2, 1994Date of Patent: March 18, 1997Assignee: E. F. Johnson CompanyInventors: Keith W. Barnes, Donald R. Bauman, Howard N. Brace, Philip A. Keefer, Michael E. Mihelich
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Patent number: 5603080Abstract: A repeater system in a communication system including a base station and a mobile unit provides a communications link between the base station and the mobile unit when the mobile unit is located in an environment that is substantially closed off to high radio frequency communication between the base station and the mobile unit. The repeater system has a first linear two-way frequency converter including a high frequency port for two-way coupling to the base station and a low frequency port for two-way coupling to a low frequency signal that is capable of distributing radio frequency power through the closed environment. The low frequency port is connected to a cable which propagates and receives low radio frequency power within the closed environment.Type: GrantFiled: October 13, 1994Date of Patent: February 11, 1997Assignee: Telefonaktiebolaget LM EricssonInventors: Stefan E. P. Kallander, Philippe Charas
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Patent number: 5548802Abstract: 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 network terminal (RNT) switch and a unique signaling protocol and a switching protocol especially adapted for communication of control signals in the subaudio band for interconnecting the trunked transmission communications systems into a wide area network that provides an expanded feature set of radio communications capabilities.Type: GrantFiled: March 28, 1995Date of Patent: August 20, 1996Assignee: E. F. Johnson CompanyInventors: Keith W. Barnes, Donald R. Bauman, Howard N. Brace, Philip A. Keefer, Michael E. Mihelich
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Patent number: 5537680Abstract: A cellular receiver range extender has an input terminal connectable to an antenna and an output terminal to which may be connected a microwave radio receiver for cellular communication signals. The input terminal directs RF signals to a bandpass preselector covering a frequency spectrum of 825 MHz to 890 MHz leading to a low-noise preamplifier for amplifying the preselected RF signals. A divider coupled to the preamplifier feeds signals from the preamplifier at equal power levels into first and second RF paths. The first path includes a band pass filter covering the reverse cellular communication channel RF signal band from 825 MHz to 845 MHz, and the second path includes a band pass filter covering the forward cellular communication channel RF signal band from 870 MHz to 890 MHz. In the first path reverse channel signals are amplified by a low-noise amplifier while in the second path forward channel signals are attenuated.Type: GrantFiled: December 27, 1994Date of Patent: July 16, 1996Assignee: Insulated Wire IncorporatedInventor: Saverio T. Bruno
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Patent number: 5533027Abstract: An arrangement for radio communication includes a first radio station or base station, a number of second radio stations, and a number of subscriber stations. The second radio stations each include a digital radio arrangement and first and second devices for, respectively, communicating with the first station and with a subscriber station. The first device includes a long-range antenna for communication with the first station. The second device includes an antenna for communication with at least one of the subscriber stations. The digital radio arrangement includes a radio switch having a common transceiver providing wireless communication with the first station as well as with a subscriber station.Type: GrantFiled: August 28, 1995Date of Patent: July 2, 1996Assignee: Telefonaktiebolaget LM EricssonInventors: Dag E. Akerberg, Petrus van de Berg
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Patent number: 5530909Abstract: In order to transmit information between an emitting station and a receiving station separated by a distance exceeding the range of direct communications of said stations, the method according to the invention consists in equipping aerodynes, travelling in the space included between these two stations, with open communications relay systems of limited range which can momentarily interconnect, when within range of one another, in order to pass information from relay system to relay system up to its destination. The invention applies notably to air-to-ground communications for data links in the field of air transport.Type: GrantFiled: March 25, 1994Date of Patent: June 25, 1996Assignee: Sextant AvioniqueInventors: Georges-Henri Simon, Cedric D'Silva
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Patent number: 5530914Abstract: A method for determining when a radio leaves a radio talk group includes the step of notifying a radio(s), such as the initiator of the call (step 308), that one or more members of the talk group left the talk group. This information allows for the initiator of the call or another radio to re-transmit the call at a later date, or to attempt to get the missing radios back into the talk group prior to transmitting another call.Type: GrantFiled: August 15, 1994Date of Patent: June 25, 1996Assignee: Motorola, Inc.Inventor: Laura L. McPheters
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Patent number: 5487101Abstract: An off-load cellular system controls cellular service between a main cellular system and the off-load cellular system and provides off-load cellular service to a mobile telephone. The off-load cellular system includes a receiver circuit, monitoring and receiving an origination message broadcast from the mobile telephone located in the off-load cellular system, and a system controller, for receiving the origination message output from the receiver circuit, and for outputting a connect signal indicating whether the off-load cellular service is to be provided to the mobile telephone responsive to the origination message.Type: GrantFiled: March 26, 1993Date of Patent: January 23, 1996Assignee: Celcore, Inc.Inventor: Anthony G. Fletcher
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Patent number: 5473605Abstract: While participating in a group call on a first wireless communication resource 114, senior members 104-107 of a communication group 108 can initiate a semi-private call. A central controller 110 allocates a second wireless communication resource 115 for the semi-private call. Furthermore, executive members 106-107 can initiate an executive call to be established on a third wireless communication resource 116. Executive members can participate in the executive call, the semi-private call, and the group call, whereas senior members can participate in the semi-private call and the group call. Junior members 101-103, normally allowed to participate only in the group call, can be selected by senior members to temporarily participate in the group call and the semi-private call.Type: GrantFiled: February 28, 1995Date of Patent: December 5, 1995Inventors: Gary W. Grube, Brian K. Bunkenburg, Marc C. Naddell
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Patent number: 5465386Abstract: 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 transceivers for transmitting and receiving transmission trunked radio communications over one or more radio channels. The transmission trunked radio communications comprises an information signal having either voice information, data information, or both, and a control signal. The transceivers communicate with a selected one of a plurality of repeaters to establish transmission trunked radio communications on one of the preassigned set of the radio channels between the repeater and one or more transceivers. The enhanced signaling protocol and switching protocol are especially adapted for communicating control signals in the subaudio band to interconnect a plurality of transmission trunked communication systems into a wide area network.Type: GrantFiled: September 2, 1994Date of Patent: November 7, 1995Assignee: E.F. Johnson CompanyInventors: Keith W. Barnes, Donald R. Bauman, Howard N. Brace, Philip A. Keefer, Michael E. Mihelich
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Patent number: 5442803Abstract: A half duplex radio communication system having including a plurality of terminal equipments and a base station for relaying communications between the terminal equipments is characterized by, in each of the terminal equipments, transmitting a transmission right demand signal upon initiation of transmission and a transmission end signal upon termination of transmission. The base station is responsive to the transmission right demand signal from the terminal equipment for assigning a transmission channel, and is responsive to the transmission end signal for releasing the channel assignment and for assigning the transmission channel for the terminal equipment newly obtaining the transmission right.Type: GrantFiled: October 8, 1992Date of Patent: August 15, 1995Assignee: NEC CorporationInventor: Yukitsuna Furuya
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Patent number: 5442681Abstract: A communication system employs a method for exchanging communicated signals between a remote base site (e.g., 63) and a central site (205) on a communication resource (e.g., 77) assigned to the remote base site (63). The central site (205) or the remote base site (63) determines that a signal must be exchanged between the remote base site (63) and the central site (205). The remote base site (63) then allocates the communication resource (77) for exchanging the signal from those communication resources (e.g., 76 and 77) assigned to the remote base site (63) for exchanging signals with communication units (e.g., 18) in the service coverage area (53) of the remote base site (63).Type: GrantFiled: May 3, 1993Date of Patent: August 15, 1995Assignee: Motorola Inc.Inventors: Michael D. Kotzin, Valy Lev, Stephen L. Spear
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Patent number: 5423055Abstract: A method to implement multiple talk-around communication links using the communication resources of one repeater. A system resource controller determines whether talk-around is possible for any two communication units intending to engage in a point-to-point communication link. Assignment of a talk-around repeater depends on the geographic locations of the two communication units, and a predetermined range criterion between them. In addition, the talk-around communication must not interfere with any existing talk-around communication already in the system. When talk-around communication is possible, an enabling communication grant is issued to the units, and the talk-around repeater's communication resources are assigned to support the link. Otherwise, a repeater for normal trunking is assigned.Type: GrantFiled: June 29, 1993Date of Patent: June 6, 1995Assignee: Motorola, Inc.Inventors: Rafael Diaz, Masoud Bassiri
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Patent number: 5408680Abstract: A single channel autonomous trunking ("SCAT") RF repeater transmits and receives on a single duplex RF channel. The repeater operates alternately in a control channel mode and in an assigned channel mode. Digital control channel signalling results in temporary assignment of the single channel for assigned channel signalling (e.g., mobile generated messages). A holdover time period following reversion of the channel to control channel signalling minimizes collisions and permits priority to be given to emergency communications. Low speed data subaudible digital signalling may be used to provide late entry capabilities.Type: GrantFiled: August 11, 1992Date of Patent: April 18, 1995Assignee: Ericsson GE Mobile Communications Inc.Inventors: David L. Hattey, Marc A. Dissosway, Samuel Maedjaja, Houston H. Hughes, III, Jeffrey S. Childress
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Patent number: 5386470Abstract: A multiport repeater for a local area network installation has (in addition to its conventional functions) means for storing access rules for the items of equipment connected to it. It reads a portion of each frame, which may be all or part of the destination address segment and/or of the source address segment and/or of the control segment of each incoming data frame, or it could be a frame or protocol identifier incorporated in opening bytes of the data segment. It compares the data that it reads with the stored access rules to determine whether the frame is permitted or not. If not, the repeater modifies the frame which it is in the course of re-transmitting, for example by overwriting it with meaningless digits or by encrypting it. It may also report the source address, destination address and reason for deciding to modify the frame to the network controller.Type: GrantFiled: August 24, 1993Date of Patent: January 31, 1995Assignee: 3Com IrelandInventors: Steven H. Carter, Terence D. Lockyer, Christopher J. Gahan
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Patent number: 5369781Abstract: A dispatch communication system wherein a communication unit may move from the service coverage area of a first system to the service coverage area of a second system during a communication transaction without the need to re-initiate the call. Communication units and base sites under this invention are constructed to relay signals to and from the system where the call originated.Type: GrantFiled: February 6, 1992Date of Patent: November 29, 1994Assignee: Motorola, Inc.Inventors: Richard Comroe, Arun Sobti
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Patent number: 5355511Abstract: An information communicating system and method comprising an order station and a plurality of mobile stations. When the order station cannot communicate with a mobile station, the order station selects one mobile station which is nearest to the uncommunicable mobile station and orders the selected mobile station to communicate with the uncommunicated mobile station. Communicable mobile station send information to the order station. The selected mobile station communicates with the uncommunicable mobile station appointed by the order station according to an order from the order station, and transmits the position information of uncommunicable mobile station to the order station. The order station displays the position of the mobile station to control movement of the mobile station.Type: GrantFiled: August 7, 1991Date of Patent: October 11, 1994Assignee: Aisin Seiki Kabushiki KaishaInventors: Rikuo Hatano, Toshimitsu Oka
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Patent number: 5327580Abstract: A microcomputer within a duplex RF transceiver operates in an interrupt-driven manner to simultaneously encode and decode CTCSS signalling (with one microcomputer interrupt service routine being devoted to CTCSS encode, and another microcomputer interrupt service routine being devoted to CTCSS decode). Such encoding and decoding of CTCSS signalling is accomplished using minimal external control hardware (e.g., two flip flops and an inexpensive conventional multipurpose counter/timer chip). The resulting arrangement is inexpensive, reliable and requires only a few components in addition to the appropriately programmed microcomputer in order to provide simultaneous encoding and decoding of CTCSS signals in a full duplex RF transceiver context.Type: GrantFiled: June 1, 1993Date of Patent: July 5, 1994Assignee: Ericsson GE Mobile Communications Inc.Inventors: Claude L. Vignali, John R. Martin, Rodney L. Nickel, Daniel I. Schwed
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Patent number: 5321736Abstract: An RF repeater arrangement for use in linking cordless handsets to a base station, has RF repeaters spaced from a common power supply unit and so distributed over an area to be serviced by the power supply unit that each of the RF repeaters is spaced from at least one other of the RF repeaters by a distance which is less than the range of coverage of the handsets. The power supply unit has a DC power supply connected to supply DC power to said a cable inner conductor, and RF repeaters each have an antenna for exchanging the radio signals with the handsets, transmit and receive circuits and a DC power pick-up connected to the co-axial cable inner conductor for powering the respective RF repeater.Type: GrantFiled: October 30, 1992Date of Patent: June 14, 1994Assignee: PCS Microcell International Inc.Inventor: Andrew S. Beasley