Crystal Or Electron Tube Diode Patents (Class 455/331)
  • Patent number: 10211780
    Abstract: An apparatus includes a first circuit and a second circuit. The first circuit may have a first diode and a second diode connected as anti-parallel diodes and physically adjacent to each other in a substrate. The second circuit may have a third diode and a fourth diode connected as anti-parallel diodes and physically adjacent to each other in the substrate. The first circuit and the second circuit may be configured to mix two input signals to generate an output signal. A polarity of every other physically neighboring diode may be reversed.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: February 19, 2019
    Inventors: Emmanuelle R. O. Convert, Simon J. Mahon, James T. Harvey
  • Patent number: 9571035
    Abstract: An apparatus includes a first circuit and a second circuit. The first circuit may be fabricated in a substrate and generally includes a first diode and a second diode (i) connected as anti-parallel diodes and (ii) physically adjacent to each other in the substrate. The second circuit may be fabricated in the substrate and generally includes a third diode and a fourth diode (i) connected as anti-parallel diodes and (ii) physically adjacent to each other in the substrate. The first circuit and the second circuit may be (a) connected in parallel, (b) physically adjacent to each other in the substrate and (c) configured to mix two input signals to generate an output signal.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: February 14, 2017
    Assignee: MACOM Technology Solutions Holdings, Inc.
    Inventors: Emmanuelle R. O. Convert, Simon J. Mahon, James T. Harvey
  • Patent number: 9025489
    Abstract: The present invention relates to a wireless communication system and user equipment providing wireless communication services, and a method of transmitting and receiving data between a terminal and a base station in an evolved Universal Mobile Telecommunications System (UMTS) that has evolved from a Universal Mobile Telecommunications System (UMTS) or a Long Term Evolution (LTE) system, and more particularly, to a method of configuring radio resource(s) by a MAC layer of the terminal, and it may be an object of the present invention is to provide an improved method of configuring radio resource(s) in a wireless communication system in order to minimize the waste of the radio resource(s) and/or the contention of the radio resource.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: May 5, 2015
    Assignee: LG Electronics Inc.
    Inventors: Sung-Duck Chun, Seung-June Yi, Sung-Jun Park
  • Patent number: 8706117
    Abstract: Certain embodiments of the present disclosure allow a mobile station (MS) to proactively request neighbor base station information from a serving base station, for example, if a mobile neighbor advertisement (MOB_NBR-ADV) message is not received (or expected) in a predetermined time period.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: April 22, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Guangming Carl Shi, Kuo-Chun Lee, Steven D. Cheng, Shan Qing, Tom Chin
  • Patent number: 8666354
    Abstract: A distributed, diode mixer circuit includes a plurality of passive diode mixer cores including at least first and second passive diode mixer cores including doubly-balanced diodes in symmetrical balanced configuration forms, each mixer core having a pair of differential reference nodes driven by the reference signal and a pair of differential nodes driven by the data signal and a reactive impedance network including one or multiple reactive elements or transmission lines connected between the like nodes of each the first and second mixer cores.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: March 4, 2014
    Assignee: Hittite Microwave Corporation
    Inventor: Xin Jiang
  • Patent number: 8630604
    Abstract: A method for wireless communication determines, for a client device having a first wireless connection with a first connection point, to initiate a second wireless connection between the client device and a second connection point, wherein the first connection point includes an Access Point and the second connection point includes a Base Station. The method sends a message from the second connection point to the first connection point, including instructions for the first connection point to communicate with the client device using either a Point Coordinate Function (PCF) or a Distributed Coordinate Function (DCF). In addition, the method initiates the second wireless connection between the client device and the second communication point.
    Type: Grant
    Filed: August 6, 2007
    Date of Patent: January 14, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Hsiang Tsung Kung, Muhrong Yang
  • Patent number: 8583121
    Abstract: A mobile communication system includes a first base station which defines a first cell and a second base station which defines a second cell. In this mobile communication system, when communication conditions of a first mobile station currently radio-linked to the first or second base station have degraded, then the first base station stores identification information of a second mobile station currently radio-linked to the first base station and causes the second mobile station to hand over to the second cell, and thereafter changes a first radio frequency currently used in the first cell to a second radio frequency and sends the second base station a message that carries identification information of the second mobile station and information indicating the second radio frequency. When the message is received, the second base station causes the second mobile station to hand over to the first cell.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: November 12, 2013
    Assignee: Fujitsu Limited
    Inventor: Hiroyuki Fujii
  • Patent number: 8346267
    Abstract: Aspects of a method and system for controlling data distribution via cellular communications with an integrated femtocell and set-top-box (IFSTB) device are provided. In this regard, a cellular enabled communication device may detect when it is within cellular communication range of a femtocell. Upon detection of the femtocell, the cellular enabled communication device may communicate instructions to a content source instructing the content source to deliver multimedia content to the femtocell. In instances that multimedia content is already being delivered to the cellular enabled communication device prior to the detection, the instructions from the cellular enabled communication device may instruct the content source to redirect the multimedia content to the femtocell. In this regard, the multimedia content may be delivered from the content source to the cellular enabled communication device via the femtocell.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: January 1, 2013
    Assignee: Broadcom Corporation
    Inventors: Xuemin Sherman Chen, Charles Abraham, Wael William Diab, Vinko Erceg, Victor T. Hou, Jeyhan Karaoguz, Mark Kent
  • Patent number: 8305901
    Abstract: A method of generating a buffer state of a packet data convergence protocol, hereinafter called PDCP, layer for a user equipment in a wireless communication system includes including volume information of packets, which have been submitted to a layer lower than the PDCP layer and have not been confirmed by the layer or by a PDCP status report, in a buffer state report of the PDCP layer, where the packets have not been confirmed by the layer due to buffer clearing of the layer.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: November 6, 2012
    Assignee: HTC Corporation
    Inventor: Chih-Hsiang Wu
  • Patent number: 8175604
    Abstract: The invention relates to a method for communicating information relating to the scheduling of uplink data transmissions for a mobile terminal transmitting data on the uplink to a plurality of base stations during soft handover of the mobile terminal in a mobile communication system. Further at least one base station of said plurality of base stations schedules uplink data transmissions of the mobile terminal in soft handover. The different embodiments of the invention provide a communication system, a radio resource controller, a base station and mobile terminal which may perform different tasks of the method disclosed.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: May 8, 2012
    Assignee: Panasonic Corporation
    Inventors: Joachim Lohr, Eiko Seidel, Dragan Petrovic
  • Patent number: 8159377
    Abstract: A timing skew estimation system is disclosed that includes a plurality of interleaved analog-to-digital converter circuits (ADCs), a timing mismatch estimation unit, and a correction unit. The timing mismatch estimation unit calculates a correlation between each of the plurality of ADCs. Then the timing mismatch estimation unit calculates a cost function for each of the plurality of ADCs, except the reference ADC. The timing mismatch estimation unit further calculates a gradient for each of the plurality of ADCs, except the reference ADC.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: April 17, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Naor Goldman, Noam Tal, Yonina Eldar, Charles Sestok, Efrat Levy
  • Patent number: 8086210
    Abstract: A method for handing-off a mobile node (MN) from one network interface to another network interface, the network interfaces being connected to a same level 2 (L2) network. The method includes detecting at least two network interface cards (NICs) of the MN that are connected to the same L2 network by at least one of an external device and the MN. A handover decision is made to hand-off a data flow of the MN from a first of the at least two NICs to a second of the at least two NICs. L2 information about the MN in one or more related network entities connected to the same L2 network is updated so as to perform seamless handover without changing an address on level 3 (L3) or higher levels.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: December 27, 2011
    Assignees: Deutsche Telekom AG, Fachhochschule Giessen-Friedberg
    Inventors: Dmitry Sivchenko, Bangnan Xu
  • Patent number: 7965692
    Abstract: Systems and methods for handoff of a mobile node between first and second points of attachment are provided. A communication between a first and second mobile node is optimized and conducted independent of a home agent. During the handoff process the communications directed to the mobile node performing the handoff are routed to the mobile node's home agent. Once the handoff process is complete the communication is again optimized and conducted independent of home agents.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: June 21, 2011
    Assignee: Nextel Communications Inc.
    Inventors: Steve Wall, Sid Chaudhuri
  • Patent number: 7916050
    Abstract: Previously, when designing receivers for radio frequency (RF) or wireless communications, designers chose between time-interleaved (TI) analog-to-digital converters (ADCs) for intermediate frequency architectures and dual channel ADCs for direct conversion architectures. Here, similarities between TI ADCs and dual channel ADC were recognized, and an ADC that has the capability of operating as a TI ADCs and dual channel ADC is provided. This allows designer to have greatly increased flexibility during the design process which can greatly reduce design costs, while also allowing the manufacturer of the ADC to realize a reduction in its operating costs.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: March 29, 2011
    Assignee: Texas Instruments Incorporated
    Inventors: Fernando A. Mujica, Charles K. Sestok, Zigang Yang
  • Patent number: 7903762
    Abstract: A direct conversion multi-band TV tuner includes: a plurality of RF (radio frequency) paths for processing the RF signal and for generating a plurality of processed RF signals, respectively; and a TSC (tri-state chopper) based quadrature frequency converter for receiving one of said processed RF signals and converting the received processed RF signal into a in-phase baseband signal and a quadrature baseband signals; wherein the TSC based quadrature frequency converter operates in accordance with a first set of periodic three-state control signals and a second set of periodic three-state control signals that are approximately 90 degrees offset from the first set of periodic three-state control signals.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: March 8, 2011
    Assignee: Realtek Semiconductor Corp.
    Inventor: Chia-Liang Lin
  • Patent number: 7860455
    Abstract: An electric field generated by another electric field communications apparatus reaches electric field sensor ES. Electric field sensor ES outputs an electric signal in response to the changes in the electric field. The electric field that reaches electric field sensor ES enters a return path of the electric field communications apparatus that is a source of the electric field. By locating electric field sensor ES between receiver main electrode ERB and receiver return electrode ERG, electric field intensity at the location where electric field sensor ES is positioned. Therefore, sensitivity of the changes in electric field for electric field communications apparatus TRX can be improved.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: December 28, 2010
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masaaki Fukumoto, Toshiaki Sugimura, Hirotaka Nakano
  • Patent number: 7827313
    Abstract: A method is provided of at least partially securing communications, via a HIP proxy (16), between a first host (12) which is not HIP enabled and a second host (14) which is HIP enabled, the method comprising: sending (A) a query from the first host (12) to resolve the IP address of the second host (14); in response to said query, retrieving (B, C) an IP address (IPfa) and HIT (HIThip) associated with the second host (14), returning (E) from the proxy (16) a substitute IP address (IPres) associated with the second host (14), and maintaining (D) at the proxy (16) a mapping between the substitute IP address (IPres), the retrieved IP address (IPfa) and the retrieved HIT (HIThip); and upon receipt (F) of a session initiation message (TCP SYN) at the proxy (16) from the first host (12) including as its destination address the substitute IP address (IPres), using the mapping to negotiate a secure HIP connection (22) between the proxy (16) and the second host (14).
    Type: Grant
    Filed: February 13, 2004
    Date of Patent: November 2, 2010
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Patrik Salmela, Jorma Wall, Petri Jokela
  • Patent number: 7587224
    Abstract: The method and apparatus of the present invention provide for a configurable radio front end topology that allows selectable operation in a single balanced mode and in a double balanced mode of operation. Logic associated with a baseband processor determines whether to operate in a single or double balanced mode of operation and produces the mode control signal to control selective coupling of circuit components according to the specified mode. Switching circuitry is used to switch a Balun in and out of connectivity. Further, a pair of LO polarity blocks are operable to determine the polarity of a differential LO received by associated mixers according to whether a single balanced or double balanced mode is in use.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: September 8, 2009
    Assignee: Broadcom Corporation
    Inventor: Alireza Zolfaghari
  • Patent number: 7376403
    Abstract: A terahertz radiation mixer comprises a heterodyned field-effect transistor (FET) having a high electron mobility heterostructure that provides a gatable two-dimensional electron gas in the channel region of the FET. The mixer can operate in either a broadband pinch-off mode or a narrowband resonant plasmon mode by changing a grating gate bias of the FET. The mixer can beat an RF signal frequency against a local oscillator frequency to generate an intermediate frequency difference signal in the microwave region. The mixer can have a low local oscillator power requirement and a large intermediate frequency bandwidth. The terahertz radiation mixer is particularly useful for terahertz applications requiring high resolution.
    Type: Grant
    Filed: April 25, 2005
    Date of Patent: May 20, 2008
    Assignee: Sandia Corporation
    Inventors: Michael C. Wanke, S. James Allen, Mark Lee
  • Publication number: 20040203839
    Abstract: A mobile terminal can identify cellular control channels that can be received by the mobile terminal from a cellular system, by identifying a cellular control channel that can be received from a history list of cellular control channels that were previously received by the mobile terminal. A next cellular control channel that can be received by the mobile terminal then is scanned for, by skipping at least one cellular control channel that is adjacent the cellular control channel that was identified, based on channel allocation rules in the cellular system.
    Type: Application
    Filed: December 10, 2002
    Publication date: October 14, 2004
    Inventors: Christer Ostberg, Hans Stattin, Bengt Lindoff
  • Publication number: 20040106391
    Abstract: A sub-harmonic mixer comprises two field effect transistors (FETs) in which the drains are coupled together. The mixer includes a signal generator for generating two local oscillator signals in antiphase with each other and which is arranged to feed one local oscillator signal to the source of one of the FETs and the other local oscillator signal to the source of the other FET. An input and output port is coupled to the drains for receiving input signals for the mixer and outputting output signals from the mixer.
    Type: Application
    Filed: November 25, 2003
    Publication date: June 3, 2004
    Inventor: Antonio Romano
  • Publication number: 20030194978
    Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.
    Type: Application
    Filed: May 19, 2003
    Publication date: October 16, 2003
    Inventors: Pieter Vorenkamp, Klaas Bult, Frank Carr
  • Publication number: 20020086675
    Abstract: A CDMA PCS telecommunications cell (40) of increased capacity includes a plurality of sectors (42, 44, 46) controlled by a base station (14) using a defined set of CDMA codes for each sector. Capacity is increased by configuring the base station to operate at two different, non-interfering frequencies within each sector of the cell. One frequency may be used either for normal traffic or for handing off calls to or from adjacent cells. One frequency is preferably used to operate a pilot beacon for transferring calls between adjacent cells in a soft manner.
    Type: Application
    Filed: December 29, 2000
    Publication date: July 4, 2002
    Inventor: Nagi A. Mansour
  • Patent number: 6317590
    Abstract: A sub-harmonically pumped mixer has an anti-parallel diode pair switchable at twice the local oscillator frequency. Preferably, there are provided dual anti-parallel diode pairs. The local oscillator is coupled to the diode pairs by means of an unbalanced to balanced transformer. The balanced output of the transformer is coupled to the diodes and provides anti-phased signals to respective ones of anti-parallel diode pairs.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: November 13, 2001
    Assignee: Nokia Mobile Phones, Ltd.
    Inventors: Adrian P. Nash, Sean Brett
  • Patent number: 6205324
    Abstract: The invention provides a broadband double-balanced mixer capable of operating across a range of frequencies from millimeter to microwave. The mixer includes a Wilkinson type splitter.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: March 20, 2001
    Assignee: Agilent Technologies Inc.
    Inventor: Joel David Bickford
  • Patent number: 6192229
    Abstract: In a diode mixer circuit MIX, a driving circuit DRIV produces a first, second, third and fourth drive signal DS1, DS2, DS3, DS4. Each drive signal is a combination of a first and a second input signal LO, RF with the following signs: DS1: +LO+RF DS2: +LO−RF DS3: −LO+RF DS4: −LO−RF A first, second, third and fourth diode D1, D2, D3, D4 transfer the first, second, third and fourth drive signal DS1, DS2, DS3, DS4 respectively, to an output O1. The first and fourth diodes D1, D4 have the same polarity relative to the output. The second and third diodes D2, D3 also have the same polarity relative to the output, but opposite to that of the first and fourth diodes D1, D4. A mixer circuit of this type is suitable for a relatively large variety of applications, notably because it may be realized in the form of an integrated circuit.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: February 20, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Eduard F. Stikvoort, Petrus G. M. Baltus, Antoon M. H. Tombeur
  • Patent number: 6138016
    Abstract: There is disclosed a wireless communication system, including a distributed HLR, for tracking the location of mobile terminals moving between zones. There is also disclosed a method for distributing and managing the load created by the HLR functionality among a number of separate processing machines. The method permits dynamic load balancing among the HLRs to more evenly distribute the load.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: October 24, 2000
    Assignee: Nortel Networks Corporation
    Inventors: Jayant A. Kulkarni, Spencer Dawkins, Michael Hall
  • Patent number: 6131034
    Abstract: The present invention is a communication system having a plurality of forward channel communications and a plurality of corresponding reverse channel communications in a region for communications with cellular users. Each region includes a plurality of zone managers. Each zone manager includes a broadcaster having a broadcaster transmitter for broadcasting a plurality of forward channel communications using broadband broadcaster signals to form a plurality of broadcaster forward channels. Each zone manager includes an aggregator for processing reverse channel communications. Each zone manager communicates with a collector group for receiving reverse channel communications from users and forwarding reverse channel communications to the aggregator. Each of the users includes a user receiver for receiving a different forward channel from said broadcaster and includes user transmitter means for broadcasting user reverse channel communications in a different user reverse channel.
    Type: Grant
    Filed: February 2, 1998
    Date of Patent: October 10, 2000
    Assignee: SC-Wireless INC
    Inventors: Michael David McLaughlin, Kevin Dean Raack, John Andrew Vastano, John Walker Wallerius, Bruce Denis Smith, David Amundson Howard, Karen Evelyn Coates
  • Patent number: 6112058
    Abstract: A communication system having a plurality of forward channel communications and a plurality of corresponding reverse channel communications from and to a plurality of mobile users. A plurality of collectors are distributed at macro-diverse locations for receiving reverse channel signals from the users which are processed to yield one or more sequences of data bits as a burst and corresponding one or more initial confidence metrics for each bit. The initial confidence metrics have an initial range,, represented by an initial number of bits,, and are processed to form processed confidence metrics having a processed range, a.sub.p, represented by a processed number of bits, .gamma..sub.p. The collectors forward these reverse channel signals including the data bits and corresponding processed confidence metrics to aggregators. The aggregators combine the multiple collector signals for the same user received from the macro-diverse collectors.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: August 29, 2000
    Assignee: SC-Wireless Inc.
    Inventors: Andrew John Walters, John Walker Wallerius, John Andrew Vastano, Lance Kazumi Uyehara
  • Patent number: 6111538
    Abstract: Positioning system for locating a mobile body comprising a plurality of earth based spread spectrum (SS) broadcasting stations arranged geographically in a cellular pattern. Each SS broadcasting station include a modulator providing a channel signal structure which is substantially orthogonal with respect to adjacent stations in the cellular pattern, each channel signal including navigation beacon data including a unique beacon identification, station latitude and longitude, time.sub.-- slot and phase characterizations and selected parameters of adjacent stations. In one embodiment, each modulator provides a chirped SS signal in which the navigation beacon is a frequency tone that is repeatedly swept over a selected frequency band for each station. In a further embodiment, each modulator provides a GPS like direct sequence SS signal in which the navigation beacon is a PN coded broadcast.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: August 29, 2000
    Assignee: Stanford Telecommunications, Inc.
    Inventors: Leonard Schuchman, Ronald Bruno, Lloyd Engelbrecht, Aaron Weinberg
  • Patent number: 6061389
    Abstract: A frequency hopping communication system having a plurality of wireless mobile stations and at least one base station. Each wireless mobile station is operated to communicate according to a communication frame format generated by a base station. The system performing slow frequency hopping by keeping a frequency hopping interval within each frame. The hopping pattern of a frequency is designated at a field located at the tail of each communication frame by the base station.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: May 9, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Tomoaki Ishifuji, Eiichi Amada, Yoshihiro Takiyasu, Genichi Ishii, Hidehiko Jusa, Shuichi Adachi
  • Patent number: 6052583
    Abstract: An information processing system 700 tests the RF coverage reliability of a signal transmitted by a base station in a radiotelephone system cell. Information processing system 700 includes processing circuitry for receiving information characterizing the cell and outputing in response test information, the processing system operable to: estimate a radius of the cell; estimate a bin size for each of a plurality of bins partitioning the cell; estimate a minimum drive distance for validating RF coverage of the cell from the estimated radius and the estimated bin size; and select a number or road segments having a combined length exceeding the estimated minimum distance.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: April 18, 2000
    Assignee: Northern Telecom Limited
    Inventor: Charles Bernardin
  • Patent number: 6049315
    Abstract: A repeater for extending the range of communications between a base station and a mobile unit without rendering the mobile unit incapable of communicating directly with the base station. In general, the polarization of the repeater input-antenna is different from the polarization of the repeater output-antenna such that sufficient isolation exists between the input and output antennas without substantially reducing the ability of the input antenna and the output antenna to receive signals from and output signals to the base station and the mobile units. In a preferred embodiment, the repeater input antenna is circularly polarized in one direction while the repeater output antenna is circularly polarized in a direction opposite from the input antenna.
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: April 11, 2000
    Assignee: Lucent Technologies, Inc.
    Inventor: Charles John Meyer
  • Patent number: 6021312
    Abstract: A radio pager device includes a display having a zoomed-out multiline mode and a zoomed-in single line mode for display of at least a portion of a series of characters at a time extracted from a message having an address or identification code which is among those from which the pager is authorized to extract message data. The zoom mode is selectable on either a system basis, by default, or a message basis. The message specific zoom mode is determined by accessing display per address information stored in volatile memory and programmable by the user. In the single line mode, continuous horizontal character by character scrolling may be selected by the user and controlled by key actuation to toggle between a stationary paused state and a continuously scrolling state.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: February 1, 2000
    Assignee: Philips Consumer Communications, LP
    Inventor: Thomas Klein
  • Patent number: 5987099
    Abstract: A wireless telephone system provides telecommunications services for personal wireless telephone sets over an area which is divided into service cells. Each of the cells is defined by reception characteristics of a plurality of radio base stations within the cell. The telephone system includes a service controller and a port being wireline connected between each radio base station and the service controller. The service controller selects radio base stations for setting up radio links with wireless sets of calling or called persons. A base station which serves a wireless set and surrounding idle base stations monitor strengths of radio signals received from the wireless set and report running averages of the monitored signal strengths to the service controller. Movement of the wireless set from one cell to another cell during a call is detected as a drop in the running average reported by the serving base station.
    Type: Grant
    Filed: October 7, 1994
    Date of Patent: November 16, 1999
    Assignee: Northern Telecom Limited
    Inventors: Keith Daniel O'Neill, Alan Morris Redmond, Jin Kue Wong, Shoji Matsushita, David Charles Ploeg, Christian Jacques Szpilfogel, Peter David Gale, Garry Don Mah, William Owen Bird
  • Patent number: 5974307
    Abstract: This invention overcomes the disadvantages of the prior art by providing a voice response unit that communicates rapidly and directly with a metered cellular telephone network with minimum human intervention. The rapid communication is achieved by knowing the question or prompt posed by the voice response unit and preparing a response which is speed dialed to the voice response unit. The voice response unit also calculates a check sum to determine if there is an error in the information transmitted to the voice response unit. The check sum may be the total of the absolute value of the request code, account number, serial number, access code and amount desired to be added to the cellular phone divided by ten. If, the check sum calculated by the voice response unit is not divisible by ten, the voice response unit knows that the information it received is incorrect. Then, the voice response unit would ask for the information it received to be retransmitted at a different rate of speed.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: October 26, 1999
    Assignee: Pitney Bowes Inc.
    Inventors: Steve Kovlakas, Steven Vasquez, Jean-Hiram Coffy, Michael Wilson
  • Patent number: 5974330
    Abstract: A microcellular portable telephone displays one's location, data on the location of the base station and, a data table showing the interrelation between the base station identifier code and base station location data. Pressing a specified operating key converts the base station identifier code connected to the portable telephone into data on the location of the base station by referring to the data table. The location of the base station is shown on the display device by means of the converted data.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: October 26, 1999
    Assignee: Sony Corporation
    Inventor: Yoichi Negishi
  • Patent number: 5969837
    Abstract: This invention discloses a wireless communications station including a base unit including a communications interface for communicating with plural wireless communications networks, a received communications combiner for combining received communications signals received from the plural wireless communications networks into a single radio frequency output, a transmit communications splitter for splitting previously combined transmit communications signals to be transmitted to the plural wireless communications networks into plural radio frequency outputs, at least one fiberoptic transmitter receiving the single radio frequency output and providing a corresponding optical output, and at least one fiberoptic receiver receiving an optical input and providing an RF output containing previously combined transmit communications signals, a plurality of remote units, each including plural antennas for communicating with communicators along plural wireless communications networks, a received communications splitter fo
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: October 19, 1999
    Assignee: Foxcom Wireless Ltd.
    Inventors: Allan Farber, Dmitri Petrov, Howard Loboda
  • Patent number: 5943396
    Abstract: In a micro cellular system (MCS) which co-exists with a cellular system (CMTS) in a frequency band, fraudulent use of the MCS when it is moved from the CMTS to the location of another CMTS is prevented by providing a control unit 2 in the MCS which controls the overall operation of the MCS and a system ID receiving and judging unit which is capable of receiving all the downward control channels used in the CMTS. When the system ID receiving and judging unit receives a system ID transmitted from the CMTS which matches a system ID stored in the MTS, the control unit is allowed to start the operations of the MCS. Otherwise, the MCS is disabled. Therefore, if the MCS moves to another CMTS zone where the system ID is different, it is impossible to operate the MCS.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: August 24, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd..
    Inventors: Masaki Terashima, Jun Yamada, Jun Nagamatsu
  • Patent number: 5926133
    Abstract: A system for determining the location of portable communication devices such as cellular telephones and the like has multiple small, dedicated multipath calibration transponders at known positions. When a portable communication device initiates a call, base stations in the coverage area direct the transponders to generate response signals which are received by the base stations. The characteristics of the signals from the portable device and the transponders are provided to a base station controller linked to the base stations. The base station controller derives a coarse position using the raw device position information and uses the raw transponder position information and the transponder's known positions to derive a correction vector representative of multipath distortion of transponder signals in the area of the portable device.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: July 20, 1999
    Assignee: Denso Corporation
    Inventor: Donald R. Green, Jr.
  • Patent number: 5911120
    Abstract: 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 range and communications protocol. The cordless cellular base station is preferably connected to a public switched telephone network and is assigned a landline number. The cordless cellular base station acts as a conduit between the mobile station and the public switched telephone network. When the mobile station comes within range of a cordless cellular base station, it deregisters automatically from the cellular network and register with the cordless cellular base station. Once the mobile station is communicating with the cordless cellular base station, the cordless cellular base station communicates with the cellular network to instruct the cellular network to route all calls for mobile identification number to the cordless cellular base station's landline number.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: June 8, 1999
    Assignees: AT&T Wireless Services, Atmel Corp
    Inventors: Keith Jarett, Roland E. Williams, Michael A. Raffel, Roderick Nelson, Ileana A. Leuca, Tony S. Lee, Christopher G. Lawrence, Masud Kibria, David R. Glass, Michael D. Bamburak
  • Patent number: 5909651
    Abstract: In certain wireless communication systems, including at least some CDMA cellular systems, short messages can be delivered to mobile stations in a broadcast fashion using a common forward (downlink) channel sometimes referred to as the Paging Channel. Economy in the use of the Paging Channel can be achieved by using so-called slotted mode reception. In accordance with this mode, the infrastructure directs messages to a given mobile station only during time slots allocated to the particular group of mobile stations to which the given station belongs. These time slots recur according to a paging slot cycle having a specified length (expressed as a number of slots), or slot cycle index. Disclosed here is a further cycle, referred to as the Broadcast Paging Cycle, for use in implementing a service for broadcasting short messages (to many mobile stations). The Broadcast Paging Cycle has an index that is larger than, and incommensurable with, the paging slot cycle index.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: June 1, 1999
    Assignee: Lucent Technologies Inc.
    Inventors: Sharat Subramaniyam Chander, Semyon B. Mizikovsky
  • Patent number: 5887021
    Abstract: A base station receiver and a method for receiving a signal in a base station receiver the service area of which is divided into sectors, the signal including multipath propagated signal components. To provide a preferred base station structure, the signal components received in each sector are converted in the method to an intermediate frequency and to digital form, the digitalized signal components are supplied by use of a sector-specific multiplexed bus to a plural number of correlation and spectrum assembling elements, in which each signal component is demodulated and assembled to narrowband form, and the demodulated signal components are supplied by connecting elements to a plural number of receiver-specific combining elements, in which the signals obtained from the different sectors are combined and detected.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: March 23, 1999
    Assignee: Nokia Telecommunications OY
    Inventors: Ilkka Keskitalo, Petri Hokkanen
  • Patent number: 5878115
    Abstract: A routing address representing an alternative terminal is assigned to a particular service area. Such a service area comprises a Local Access and Transport Area (LATA), Mobile Switching Center (MSC) area, Location Area, and Cell Area. Whenever an incoming call is received towards a mobile station currently located within the particular service area, instead of transmitting a routing address representing the mobile station, the serving mobile switching center (MSC) transmits a signal containing the routing address representing the alternative terminal. Instead of routing the call to the intended mobile station, the gateway mobile switching center (GMSC) utilizes the received routing address and reroutes the incoming call to the alternative terminal. By rerouting all incoming calls towards the alternative terminal in case of an emergency, all available access channels are reserved for making outgoing calls by the mobile subscribers located within the emergency service area.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: March 2, 1999
    Assignee: Ericsson, Inc.
    Inventors: Eric L. Valentine, Vladimir Alperovich, James L. Mills, Erkki Joensuu, Mahesh Patel, David Boltz
  • Patent number: 5844522
    Abstract: A wireless network based location system and method uses an existing wireless communication network to locate the position of any active phone or transceiver unit in the network. The system includes a plurality of agile vector sensor units, one each installed at each antenna site in the network, and a remote central monitoring station to which wireless network users can call for assistance in the event of an emergency. The system is designed to locate a portable phone transceiver unit using the reverse voice channel signal transmitted by the transceiver unit. Each agile vector sensor unit locks onto the reverse voice channel to determine azimuth and signal strength in the reverse voice channel, and also tracks any changes in voice channel by monitoring the forward voice channel. In the event of a voice channel change, the sensor unit tunes to the new voice channel. The azimuth, signal strength, and reverse voice channel information collected is used to track the location of a transceiver unit in real time.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: December 1, 1998
    Assignee: Trackmobile, Inc.
    Inventors: Eliezer A. Sheffer, Paul J. Bouchard
  • Patent number: 5841806
    Abstract: An apparatus for communicating variable rate data over a communication channel. A modulator that receive frames of user data each comprised of data symbols. The modulator repeats the data symbols within each frame to maintain a constant data rate. A transmitter receiver the modulator data and scales the modulated symbol data based upon the amount of symbol repetition in the frame.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: November 24, 1998
    Assignee: QUALCOMM Incorporated
    Inventors: Klein S. Gilhousen, Irwin M. Jacobs, Roberto Padovani, Lindsay A. Weaver, Jr., Charles E. Wheatley, III, Andrew J. Viterbi
  • Patent number: 5835851
    Abstract: A method and apparatus for reducing the echo in a hands-free digital cellular communications system is presented. Acting upon speech signals being present in the downlink, uplink speech frames generated by the hands-free communication device are attenuated to prevent the downlink speech signals from being transmitted at full volume back on the uplink as an echo. Added to the attenutated uplink speech frame is a noise frame generated by the hands-free communication device, which provides a consistent level of background noise to the person at the other end of the call. The noise codeword is further randomly ordered to prevent any modulative effects from the process.
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: November 10, 1998
    Assignee: Ericsson Inc.
    Inventors: Jim A. J. Rasmusson, Torbjorn Wilson Solve, Robert Allen Zak
  • Patent number: 5835849
    Abstract: A cellular mobile radio systems includes fixed stations and mobile stations, a radio cell being subdivided into sub-cells and each sub-cell being assigned its own allocation of radio channels. The values of radio parameters of the fixed stations are measured and evaluated for assigning a mobile station to a sub-cell. To achieve an additional increase of the radio channel capacity of such system, a position vector is assigned to each respective mobile station which is derived from the measured parameters. A mobile station is then assigned to a specific sub-cell on the basis of its position vector.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: November 10, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Jesus M. Duque-Anton, Dietmar W. Kunz, Bernhard J. Ruber
  • Patent number: 5818833
    Abstract: Both call switching communication and packet communication are achieved by one personal communication device. Misreceiving in the personal communication device usable in two communication modes is prevented. The personal communication device has a call switching modem and a packet switching modem. The former is used for AMPS network, and the latter for CDPD network. A telecommunication system includes a transmission/receiving terminal and a telecommunication network. The packet switching modem of the terminal awaits the receiving and initial transmission. In this system, the transmission terminal first sends a CDPD packet to the receiving terminal. The receiving terminal is informed of a request for call switching communication. The receiving terminal sends back a response to the request as a CDPD packet, and then a call in the AMPS network is made. Although the personal communication device is usable in the two modes, misreceiving does not occur because awaiting is in a fixed mode.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: October 6, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kazuhiko Maruyama
  • Patent number: 5815525
    Abstract: A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include both licensed and unlicensed frequency bands, particularly frequency bands including the 902-928 MHz, 1850-1990 MHz, and 2.4-2.4835 GHz frequency bands. Spread-spectrum communication channels are 10 MHz or less in width. The frequency band onto which spread-spectrum signals are encoded may be changed upon a change in environment or other control trigger, such as establishment or de-establishment of communication with a private access network.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: September 29, 1998
    Assignee: Omnipoint Corporation
    Inventors: Douglas G. Smith, Robert C. Dixon, Jeffrey S. Vanderpool