Push-pull Patents (Class 455/332)
  • Patent number: 9143269
    Abstract: A method of wireless communication for communication between a base station and a plurality of terminal apparatuses, the method including: dividing an available frequency into a plurality of segments and notifying control information to the terminal apparatus, the control information including setting of a segment of the plurality of segments, communication quality of which will be fed back by the terminal apparatus, and cancellation of a segment of the plurality of segments, communication quality of which has already been fed back from the terminal apparatus; and feeding back communication quality related to a predetermined segment to the base station in accordance with the control information by the terminal apparatus.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: September 22, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Kenzaburo Fujishima, Masanori Taira
  • Patent number: 8805274
    Abstract: An architecture and protocol enables signal communications between either a frequency translation module and a decoder within a dwelling, or between an antenna and a decoder within a dwelling. According to an exemplary embodiment, the decoder comprises a switch 33 between the low noise block converter power supply, and a transceiver and output coupling. The switch 33 generates a high impedance during operation of the frequency translation module and the LNB power supply 38, thereby isolating the transceiver and the output coupling from the LNB power supply. The switch generates a low impedance between the LNB power supply and the transceiver and output coupling during operation of the LNB power supply.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: August 12, 2014
    Assignee: Thomson Licensing
    Inventors: John James Fitzpatrick, Lincheng Xiu
  • Patent number: 8688055
    Abstract: An amplifier integrated circuit (IC) including a push-pull amplifier having a push stage and a pull stage. A first loop of wire configured to form a first degeneration inductance of the push stage. A second loop of wire configured to form a first degeneration inductance of the pull stage. The first loop and the second loop are concentric. The first loop is connected to a reference potential. The second loop is connected to a supply voltage.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: April 1, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Brian T. Brunn, Sehat Sutardja, Xiaohua Fan, Gregory T. Uehara
  • Patent number: 8472958
    Abstract: In a wireless telecommunication system for transmitting a plurality of streams from a base transmission station comprising a plurality of antennas to a mobile station comprising a plurality of antennas, the base transmission station respectively transmits, by way of a plurality of the antennas, each stream obtained by dividing data to be transmitted. The mobile station respectively receives each stream by utilizing the plurality of antennas. A measurement unit respectively measures a reception quality or received power from each antenna relating to a stream. A changeover unit carries out a handover for each stream according to a measurement result by the measurement unit.
    Type: Grant
    Filed: August 20, 2009
    Date of Patent: June 25, 2013
    Assignee: Fujitsu Limited
    Inventors: Takayoshi Ode, Kazuo Kawabata
  • Patent number: 8432899
    Abstract: Under one aspect, a system for transmitting an IP-based message from an initiator to a receiver lacking an IP address via a packet-switched (PS) network capable of communicating IP-based messages and a circuit-switched (CS) network capable of communicating non-IP-based messages, includes: a serving node in communication with the PS network and the CS network, the serving node including logic to: receive the IP-based message from the initiator over the PS network; generate a trigger message responsive to the IP-based message, the trigger message including a non-IP-based message including instructions for the receiver to initiate a connection to the PS network; and transmit the trigger message to the receiver via the CS network, and the receiver including logic to initiate a connection to the PS network and to receive the IP-based message responsive to the trigger message. Methods are also disclosed.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: April 30, 2013
    Assignee: Aylus Networks, Inc.
    Inventor: Shamim A. Naqvi
  • Patent number: 8346179
    Abstract: An amplifier integrated circuit (IC) includes a push-pull configuration including a push stage and a pull stage. A first loop of wire is configured to form a first degeneration inductance of the push stage. A second loop of wire is configured to form a first degeneration inductance of the pull stage. The first and second loops are concentric.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: January 1, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Brian Brunn, Sehat Sutardja, Xiaohua Fan, Gregory Uehara
  • Patent number: 8219131
    Abstract: To prevent a hung-up of communications due to changes in a radio wave condition resulting from frequent displacement of the terminals and changes in a number of the terminals, and to realize switching of the radio systems adapting to the radio condition. A radio communication system comprising: a base station for providing a plurality of radio systems, and terminals for communicating with the base station through the plurality of radio systems. The base station decides a priority of the radio system on which the each terminal will communicate thereafter and transmits paging signals of one of the plurality of radio systems which includes information on the decided priority to the each terminal.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: July 10, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Ryouji Yamaoka, Junji Yamamoto, Koji Wakayama, Seishi Hanaoka, Takehiro Morishige, Masashi Yano, Toshiaki Suzuki, Satoshi Yoshizawa
  • Patent number: 7990925
    Abstract: Seamless communication handoff is achieved by establishing a protocol tunnel to route leftover packets between network access nodes during the handoff. For example, in a mobile IP-based system, a mobile node may perform a handoff from a first access node that is associated with a first routing node to a second access node that is associated with a second routing node. To prevent the loss of any packets that may be in route for delivery to or from the first routing node during the handoff, the mobile node establishes a protocol tunnel with the first access node via the second access node. On the forward-link, packets being delivered from the first routing node are routed over the protocol tunnel to the second access node and then to the mobile node. On the reverse-link, packets being sent to the first routing node are routed over the protocol tunnel from the mobile node to the second access node and then to the first routing node.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: August 2, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Peerapol Tinnakornsrisuphap, Fatih Ulupinar, Jun Wang, Parag Arun Agashe
  • Patent number: 7912440
    Abstract: Apparatus (40) comprising a voltage input (49) for applying an unfiltered voltage (V_unfil) and a current input (48) for receiving a bias current (Ib) from a current source. The apparatus (40) further comprises a differential filtering resistive circuit with a first current mirror (44) and a second current mirror (43), being situated between a common output node (50) and said voltage input (49). A first mirror circuit (42) for mirroring the bias current (Ib) to said first current mirror (44), and a second mirror circuit (41) for mirroring a current (Ix) to said second current mirror (43) are employed. A filter capacitor (51) situated at the output side of the apparatus (40), said filter capacitor (51) being connected on one side to said common output node (50) and on the other side to ground. The apparatus (40) provides a filtered output voltage (V_fil) at said common output node (50).
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: March 22, 2011
    Assignee: ST-Ericsson SA
    Inventor: Willem Hendrik Groeneweg
  • 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: 7729678
    Abstract: Controllable operational transconductance power amplifier (controllable power OTA) including an input stage receiving a differential input signal (Ovin) and deriving therefrom first (i1) and second (i2) low power current signals being coupled to first (ccs1) and second (ccs2) current controlled output current sources being arranged in class B push pull configuration. To obtain an effective gain control while securing power efficiency and linearity, the overall gain of the power OTA is controlled by varying the gain or transconductance of the input stage (c15) and by the use of means for bi-directionally rectifying said first (i1) and second (io) low power current signals and providing in mutual alternation power amplification of said first (i1) and second (i2) low power current signals into first (I01) and second (Io2) mutually exclusive high power current output signals, which are supplied through a current summer to a current output (I0) of said linear power amplifier.
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: June 1, 2010
    Assignee: Semiconductor Ideas to Market (ITOM) BV
    Inventor: Wolfdietrich Georg Kasperkovitz
  • Patent number: 7693539
    Abstract: A mobile communication system comprises: a determination unit configured to determine as to layers of data to be transmitted by base stations to mobile stations for respective radio areas, based on area resource information concerning radio resources for the respective radio areas covered by the base stations; and a radio transmitter configured to transmit the data to the mobile stations according to a determination of the determination unit.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: April 6, 2010
    Assignee: NTT DoCoMo, Inc.
    Inventors: Mayu Yamada, Takehiro Nakamura, Minami Ishii, Masafumi Usuda, Sung Uk Moon, Akihito Hanaki
  • Patent number: 7657247
    Abstract: A Gilbert cell mixer for a wireless transceiver includes a first stage that performs voltage to current conversions and that includes first and second transistors that are operated in a saturation region and third and fourth transistors that are operated in a triode region. A second stage communicates with the first stage and that performs frequency conversion. A biasing circuit communicates with the first stage to maintain a substantially constant input linear range over temperature and process variations.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: February 2, 2010
    Assignee: Marvell International Ltd.
    Inventors: King Chun Tsai, Lawrence Tse
  • Patent number: 7505751
    Abstract: A wireless mesh network architecture includes a plurality of wireless nodes, with each wireless node in the network is connected to every other wireless node in the network. Each pair of wireless nodes is coupled by a link dedicated to exchange of data by the pair of nodes. The link is characterized by an agreement between two end points of the link to rendezvous for the purposes of exchanging data at a predetermined time over a predetermined channel. Methods of negotiating rendezvous characteristics, such as rendezvous channel, time, frequency, duration and transmission power ensure that the selected link is tuned to minimize interference and power usage in the WN. A handshake mechanism enables high performance data delivery with minimal packet loss. The link based architecture uses Link State Advertisements, traffic tags and spanning trees to fine tune packet flow through divergent devices in the network.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: March 17, 2009
    Assignee: Autocell Laboratories, Inc.
    Inventor: Floyd Backes
  • Patent number: 7415262
    Abstract: An access point in a wireless network receives link margin values from associated access points. The access point determines sensitivity values for the associated access points and determines a lower access point output power value from the sensitivity values. Beacons are transmitted at full power and remaining frames are transmitted at the lower access output power. A new access output power may be determined periodically, or when a station associates or disassociates.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: August 19, 2008
    Assignee: Intel Corporation
    Inventors: Jiewen Liu, Chih C. Tsien
  • Patent number: 7411931
    Abstract: The invention is a terminal, system and method for providing inter-frequency and inter-system handovers. A terminal 20? in accordance with the invention includes at least one radio transceiver including P radio receivers and at least one transmitter (16) with P being an integer at least equal to 2. Each radio receiver includes an antenna (41) which receives M encoded data streams. A terminal controller 18 controls the that at least one radio transceiver.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: August 12, 2008
    Assignee: Nokia Corporation
    Inventors: Harri Holma, Antti Toskala
  • Patent number: 7200633
    Abstract: An information delivery system and information delivery method can provide information delivery services that utilize network resources efficiently. A push server 3 transmits data associated with summary content 15 (summary of detailed content 23) to a push delivery controller 2, and a terminal 1 transmits data associated with the terminal 1 to the push delivery controller 2. According to these data, the push delivery controller 2 decides the terminal to which the summary content is to be transmitted, and notifies the push server 3 of the terminal. The push server 3 transmits the summary content to the terminal notified. When the terminal 1 wishes to acquire the detailed content corresponding to the received summary content, it sends to the pull server 4 a request to transmit the detailed content. In response to the request, the pull server 4 transmits the detailed content to the terminal 1.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: April 3, 2007
    Assignee: NTT DoCoMo, Inc.
    Inventors: Shunichi Sekiguchi, Minoru Etoh
  • Patent number: 7177620
    Abstract: A Gilbert cell mixer for a wireless transceiver includes a first stage that performs voltage to current conversions and that includes first and second transistors that are operated in a saturation region and third and fourth transistors that are operated in a triode region. A second stage communicates with the first stage and that performs frequency conversion. A biasing circuit communicates with the first stage to maintain a substantially constant input linear range over temperature and process variations.
    Type: Grant
    Filed: March 14, 2003
    Date of Patent: February 13, 2007
    Assignee: Marvell International Ltd.
    Inventors: King Chun Tsai, Lawrence Tse
  • Patent number: 7177619
    Abstract: A method modifies dual gate transistor into a radio frequency switch. The method attaches a first signal input to a first gate of the transistor, attaches a second signal input to the source or drain of the transistor, attaches a common gate contact to the first gate and the second gate, attaches a signal output to a second gate of the transistor, attaches a source/drain contact connected to the source region or drain region where the second signal input is attached, and modulates the voltage supplied to the common gate and the source/drain contact to control the radio frequency switch.
    Type: Grant
    Filed: January 25, 2005
    Date of Patent: February 13, 2007
    Assignee: International Business Machines Corporation
    Inventor: Edward J. Nowak
  • Patent number: 6778132
    Abstract: A microwave sensor is described, with a self-mixing oscillator (1), with a transmitting and receiving antenna (2), with an impedance (3) which is connected between the current or voltage supply (4) and the oscillator (2), and with an evaluation circuit (5), the self-mixing oscillator (2) producing both the transmitted signal and also mixing the transmitted signal with the received signal and the low-frequency mixed (Doppler signal) being tapped on the impedance (3) and supplied to the evaluation circuit (5). The microwave sensor has only lower power consumption, and the microwave sensor can also be economically produced in that the self-mixing oscillator (2) is made as a push-pull oscillator with two transistors (6, 7).
    Type: Grant
    Filed: February 13, 2003
    Date of Patent: August 17, 2004
    Assignee: i f m electronic GmbH
    Inventor: Jaromir Palata
  • Patent number: 6741587
    Abstract: The invention is a terminal, system and method for providing inter-frequency and inter-system handovers. A terminal 20′ in accordance with the invention includes at least one radio transceiver including P radio receivers and at least one transmitter (16) with P being an integer at least equal to 2. Each radio receiver includes an antenna (41) which receives M encoded data streams. A terminal controller 18 controls the that at least one radio transceiver.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: May 25, 2004
    Assignee: Nokia Corporation
    Inventors: Harri Holma, Antti Toskala
  • Publication number: 20020146998
    Abstract: In a single-to-differential conversion circuit for converting a single signal into a differential signal formed of first and second signal components: a source-grounded (or emitter-grounded) first transistor receives the single signal at the drain (or collector); the gate (or base) and drain (or collector) of the first transistor are connected; the gate (or base) of a source-grounded (or emitter-grounded) second transistor is connected to the gate (or base) of the first transistor; the drain (or collector) of a gate-grounded (or base-grounded) third transistor outputs the first signal component; the source (or emitter) of the third transistor is connected to the drain (or collector) of the first transistor; the drain (or collector) of a gate-grounded (or base-grounded) fourth transistor outputs the second signal component; and the source (or emitter) of the fourth transistor is connected to the drain (or collector) of the second transistor.
    Type: Application
    Filed: February 28, 2002
    Publication date: October 10, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Wakako Hoshino, Noriaki Shirai
  • Patent number: 6437659
    Abstract: A cost-effective push-pull arrangement for distributing the power output of the signal from the mixing/local oscillator, so that the transistors are able to be modulated with the same power and with 180° phase shift, and so that, in spite of manufacturing tolerances of the transistor parameters, the signal is effectively decoupled from the other signal gates of the circuit.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: August 20, 2002
    Assignee: DaimlerChrysler AG
    Inventor: Peter Nuechter
  • Publication number: 20010016482
    Abstract: In a mobile communication network (SYS) data transmission between a radio base station (RBS) and a subscriber station (UE) is carried out by successively transmitting frames. The radio network controller (RNC) inserts at the beginning of the respective frames an indicator flag (MOP) indicating to the subscriber stations (UE) whether the frame or a succeeding frame contains data which must be read and decoded by the subscriber stations (UE). The subscriber station can by reading and decoding the indicator flag (MOP) determine that there is no necessity to read data from the present frame or a succeeding frame and can therefore use the time period of one or more frames to save network resources or to perform inter-frequency measurements on another frequency. The invention finds particular application in a WCDMA mobile communication system.
    Type: Application
    Filed: December 29, 2000
    Publication date: August 23, 2001
    Inventors: Karl Olof Joakim Bergstrom, Thomas Rimhagen
  • Patent number: 6141552
    Abstract: The mobility of mobile subscribers within a wireless digital communications system is estimated based on highway maps and traffic data. Cells within the network are modelled as nodes connected by edges where neighboring cells are connected by roads. Each edge has two edge weight components representing traffic flow from one cell to the other and vice versa. The edge weight components are calculated from terrain factors based on the size or capacity of the roads connecting the two cells and the total traffic within the subject cell, which information may be obtained from commercial geographic databases and/or government agencies. The resulting edge weight represents an expected number of handoffs between the two cells. The problem of partitioning cells among available switches within the network is thus reduced to the purely mathematical problem of minimizing the total edge weights of edges intersected by the partition boundaries.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: October 31, 2000
    Assignee: Nortel Networks Corporation
    Inventors: Andrew Sendonaris, Hongyi Chen, Nikhil Jain, Seshagri Madhavapeddy, Sairam Subramanian
  • Patent number: 6138000
    Abstract: An RF mixer utilizing frequency and bias compensation for improved performance characteristics. The RF mixer receives bias signals that are dependent on V.sub.CC levels to internally balance the local oscillation received and mix the perfectly bias balanced internally generated oscillation signal with the RF input.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: October 24, 2000
    Assignee: Philips Electronics North America Corporation
    Inventors: Nasrollah Saeed Navid, Ali Fotowat-Ahmady, Farbod Behbahani
  • 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: 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: 6029054
    Abstract: A receiver, especially useful for MMIC semiconductor communications circuits, in which plural mixers replace LRC filter networks to produce notched bandwidth filters. In a preferred embodiment, the input signal and a the output of a variable oscillator are mixed to produce a beat frequency. As an operator changes the desired frequency notch of the receiver, the output frequency of variable oscillator similarly changes to ensure that the beat frequency is the same regardless of desired frequency. Circuity downstream may be thus fixed, eliminating the need for large variable capacitors, which MMIC technology cannot fabricate in desirably small sizes.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: February 22, 2000
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Leo W. Lemley
  • Patent number: 6014551
    Abstract: The present invention relates to an arrangement for transmitting a radio-frequency signal at two different frequency bands and for receiving at two different frequency bands. The arrangement can be applied for instance to a transceiver of a radio communications system operating at two different frequency bands, or to a transceiver meant to be used in connection with two different radio communications systems. One of the ideas of the invention is that one and the same filter (72), belonging to the RF front end of the antenna circuit, is used for filtering interference from at least two signals located at different frequency bands, in which case the number of filters (72, 75) can be reduced. By means of the solution suggested in the invention, also the number of controllable switches (73) provided on the signal path of the RF front end can be minimized.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: January 11, 2000
    Assignee: Nokia Mobile Phones Ltd.
    Inventors: Mikko Pesola, Kari T. Lehtinen
  • Patent number: 5995830
    Abstract: A method and apparatus for processing dropped calls. If, during an established call between two communication devices, a telecommunication network node determines that a communication link to one of the devices has been dropped, the node determines the cause of the dropped communication link and sends a status message to the non-dropped communication device. If a reconnection attempt is appropriate, the node attempts to reconnect to the dropped device. If a reconnection attempt is not appropriate, or if the reconnection attempt is unsuccessful, the non-dropped communication device is connected to a voice mail node. If the reconnection attempt is successful, the call between the two communication devices is re-established.
    Type: Grant
    Filed: April 9, 1997
    Date of Patent: November 30, 1999
    Assignee: AT&T Wireless Services Inc.
    Inventors: Umesh J. Amin, Bruce E. Rotvold
  • 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: 5970408
    Abstract: Control circuitry and an associated method for a modified-user, wireless communications system, such as a cellular communication system wherein groups of mobile transceiver units are positioned to travel together. Circuitry is positioned to travel together with the group of mobile transceiver units and to generate common control requests to control operation of the entire group of mobile transceiver units. When embodied in a cellular communication system, a common hand-off request is generated for the entire group of mobile transceiver units, obviating the need for each transceiver unit to independently generate a hand-off request. If a mobile transceiver is operable pursuant to an air interface standard dissimilar to a fixed-site transceiver with which communications are to be effectuated, a converter converts communication signals so that the communication signals can be communicated therebetween.
    Type: Grant
    Filed: May 2, 1997
    Date of Patent: October 19, 1999
    Assignee: Telefonaktiebolaget L/M Ericsson (publ)
    Inventors: Goran Carlsson, Marie Lambertsson, Glen Schmid
  • 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: 5870427
    Abstract: A method for handoff of an analog connection within a cellular communication system which relies upon mobile station synchronization to a system time is disclosed herein. In order to reduce the acquisition time for a mobile station commencing operation in a digital mode, an estimate of master system time is transferred to the mobile station in analog mode before entering digital mode. The alignment operates within the protocols of existing analog systems, and hence requires only minimal changes in the mobile station. Time alignment may be initiated upon the base station sending to the mobile station a command to continually transmit a periodic signaling tone. The base station compares the phase of the signaling tone from the mobile station to a master system clock and determines an error signal. The base station notifies the mobile station to delay or advance in time the transmitted signaling tones based on the error signal.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: February 9, 1999
    Assignee: Qualcomm Incorporated
    Inventors: Edward G. Tiedemann, Jr., Alejandro Raul Holcman
  • Patent number: 5793842
    Abstract: A system and method for providing radio routing and radio frequency channel assignment in a radio telephone system utilizing signal strength and routing messages as a primary criteria for obtaining interference free call connections and communications.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: August 11, 1998
    Inventors: Jerry R. Schloemer, Leo J. Aubel
  • Patent number: 5758266
    Abstract: The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers (140 and 145). The receive path (104) has two RF channels (116 and 117) that are mixed with the frequencies generated by the synthesizers (140 and 145) and summed into one IF strip. Thus the radio of the present invention can perform a soft hand-off between frequencies while communicating with both base stations simultaneously. Additional mixing paths and synthesizers can be added if it is desired to communicate with more than two base stations simultaneously.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: May 26, 1998
    Assignee: QUALCOMM Incorporated
    Inventors: Richard K. Kornfeld, Charles E. Wheatley, III
  • Patent number: 5754945
    Abstract: In a cellular radio communications system, handoff of a mobile terminal from a serving base station to an adjacent base station is performed using two separate fuzzy logic procedures for handoff triggering and handoff targeting. For triggering, inputs to the fuzzy logic procedure are the signal strength for communications with the serving base station, a time since a failure to complete execution of a handoff, and, for mobile-assisted handoff (MAHO), signal strengths of communications between the mobile terminal and each of the adjacent base stations. If handoff is triggered, then handoff targeting is performed at a central unit. For targeting, inputs to the fuzzy logic procedure are the monitored signal strengths between the mobile terminal and each of the adjacent base stations, supplied either from the mobile terminal using MAHO or from the base stations, and the current loads of the adjacent base stations.
    Type: Grant
    Filed: January 18, 1996
    Date of Patent: May 19, 1998
    Assignee: Northern Telecom Limited
    Inventors: Jing-Yue Lin, Chang-Gang Zhang, Hong Zhao
  • Patent number: 5745481
    Abstract: A messaging system capable of transmitting messages to receivers which roam between coverage areas. In one configuration, a coverage area (600) is divided into a plurality of zones (605, 610, 615). A single simulcast system identification (SSID) number is assigned which consists of a local identification number which identifies the coverage area (600), a zone identifier which identifies a zone (610) within the coverage area, traffic splitting flags and a frequency. For larger roaming areas, a network is defined as consisting of a plurality of service areas and is identified by network identification information (NID). NID information and/or SSID information along with a priority value is stored in a receiver according to desired coverage and like information is transmitted in the corresponding zone or service area and the roaming pager operates on the frequency having the NID or SSID having the highest priority.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: April 28, 1998
    Assignee: Motorola, Inc.
    Inventors: W. Garland Phillips, Jheroen P. Dorenbosch, Terence Edward Sumner
  • Patent number: 5737328
    Abstract: A network communication system in which access points providing wireless access to the system reroute misrouted information packets in the event the location of a mobile unit has changed. Regardless of whether a host computer or other network device is capable of updating in its position table the changing locations of the mobile units, information packets directed to the mobile units from the host computer or other network device are still properly delivered.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: April 7, 1998
    Assignee: Aironet Wireless Communications, Inc.
    Inventors: Stuart G. Norman, Marvin Sojka
  • Patent number: 5737689
    Abstract: In a cellular mobile radio system, a handoff method allows a mobile station to be handed off from one base station to another base station when an alarm case occurs in an operator controlled manner in an attempt to save the connection. A cell border is defined where a handoff is allowed from a first base station to a second base station by comparing the radio transmissions between a mobile station and the first and second base stations. The handoff border is then moved by an offset value to form an alarm case cell border, wherein an alarm case handoff from the first base station to the second base station is allowed only when the mobile station experiences an alarm case and is in the area bounded by the handoff cell border and the alarm case handoff border.
    Type: Grant
    Filed: June 14, 1994
    Date of Patent: April 7, 1998
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Per Viktor Israelsson
  • Patent number: 5734700
    Abstract: One embodiment of the invention is related to a system for virtual extension of a mobile communication network by at least a second, remote mobile communication network, wherein one of communication network is of the GSM (Global System for Mobile Communications) type, including a bridgehead between the first and second mobile communication network, said bridgehead serving as an internetwork junction to one of said mobile communication networks of the GSM type (transition network). The bridgehead acts as a Visitor Location Register (VLR) for another mobile communication network and as a Home Location Register (HLR) for the transition network, if a subscriber of the other mobile communication network is in the range of the mobile communication networks of the GSM type and acts as an HLR for the other mobile communication network and as a VLR for the transition network, if a subscriber of the mobile communication networks of the GSM type is in the range of the other mobile communication network.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: March 31, 1998
    Assignee: DeTe Mobil (Deutsche Tlelkom Mobilfunk GmbH)
    Inventors: Hans Hauser, Patrik Ljungstrom
  • Patent number: 5734967
    Abstract: A code division multiple access (CDMA) communication system reduces interference by reducing the encoding rate for selected mobiles. The system primarily uses link related characteristics such as, inter alia, distance measurements, physical resource power and mobile determined noise, to determine which mobiles require a encoding rate reduction. Once determined, the encoding rate of the determined mobiles is reduced, which in turn reduces self-interference and enhances system capacity.
    Type: Grant
    Filed: December 20, 1995
    Date of Patent: March 31, 1998
    Assignee: Motorola, Inc.
    Inventors: Michael D. Kotzin, Kenneth A. Stewart
  • Patent number: 5734699
    Abstract: A cellular private branch exchange for facilitating cellular communication for a first plurality of mobile station units, which includes a first base station subsystem for communicating with a first and a second mobile station unit of the first plurality of mobile station units on respectively a first and a second cellular bearer data channel. The cellular private branch exchange further includes a cellular private branch exchange unit coupled to the first base station subsystem. In turn, the cellular private branch exchange unit includes a private mobile-services switching center for providing mobility management for the first plurality of mobile station units, the private mobile-services switching center representing a first cross-connect node capable of cross-connecting the first bearer data channel with the second bearer data channel for calls between the first and the second mobile station units.
    Type: Grant
    Filed: May 4, 1995
    Date of Patent: March 31, 1998
    Assignee: interWAVE Communications International, Ltd.
    Inventors: Priscilla Marilyn Lu, Timothy Richard White
  • Patent number: 5710974
    Abstract: The invention relates to a method for improving the reliability of a handover and call establishment in a cellular radio system which comprises at least one base station in each cell, and a group of subscriber terminal equipments which communicate with one or more base stations. The base stations measure the total interference level of signals they have received from the terminal equipments, and transmit a pilot signal with a known transmit power. The terminal equipments measure the power levels of pilot signals received from different base stations. In the system at least some transceivers comprise circuitry for estimating, by means of the pilot signals, the path loss between the terminal equipment and the base stations.
    Type: Grant
    Filed: May 15, 1996
    Date of Patent: January 20, 1998
    Assignee: Nokia Mobile Phones Ltd.
    Inventors: Seppo Granlund, Hannu Hakkinen, Seppo Hamalainen
  • Patent number: 5710986
    Abstract: A radio communication apparatus of this invention includes a mode designation switch for selectively designating and inputting a desired mode from an analog mode and a digital mode, and a mode storage circuit for storing the desired mode designated and input by the mode designation switch and has a mode setting control function, a mode comparison function, and a mode change control function. In order to establish a radio link, control is performed to set a mode for transmitting a communication signal in accordance with the desired mode stored in the mode storage circuit. After the start of transmission of the communication signal, the mode comparison function compares the mode set by the mode setting control function with the desired mode stored in the mode storage circuit.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: January 20, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Arata Obayashi, Takumi Haga, Naoyuki Wakabayashi, Takashi Sakagawa
  • Patent number: 5708965
    Abstract: A method is provided for optimally assigning power load demands between satellites in a satellite constellation for a telecommunications system. The method first obtains a satellite coverage snapshot at the satellite operations center. It then identifies the satellites with overlapping coverage areas. The user clusters are then identified which are located in the overlapping coverage areas and initially assigned to one of the covering satellites which requires the least amount of power to communicate with the user clusters or randomly. The processor then balances clusters (or portions thereof) to other satellites so as to efficiently balance the power load on the satellite constellation system. The method repeats the process at regular time intervals to maintain an efficient power balance.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: January 13, 1998
    Assignee: TRW Inc.
    Inventor: William F. Courtney
  • Patent number: 5706330
    Abstract: A communications accounting system is provided wherein the transfer of call detail record information from a remotely located phone may be accomplished in an efficient manner. During non-billable processes or during airtime billed at a reduced rate, the call detail record (CDR) information from the previous registration is simultaneously sent to the collector system for processing to the billing system. More specifically, encrypted and compressed authorization information and call details records (CDRs) from the previous use of the phone are simultaneously communicated from the Cellular Call Computer--Programmable Off-line (C3PO) to the host computer system by modem or other suitable manner. At the validation server, the authorization information is decrypted and uncompressed and stripped away from the CDRs, while the call is live, and sent to an authorization service.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: January 6, 1998
    Inventors: Cary Bufferd, Rick Harris
  • Patent number: 5701586
    Abstract: Cell selection and reselection by mobile station in a cellular mobile radio network with a plurality of layers of cells includes, when the station is in a standby state and after selection of a cell by the station, identification of a layer containing the selected cell, reselection of cells in the layer during a predetermined time-delay, cumulative counting of the number of cells reselected in the layer during that time-delay, and comparison of the cumulative number with two thresholds. The reselection, cumulative counting and comparison steps are repeated if the cumulative number is between the thresholds. Otherwise, a change of layer is effected on the basis of the comparison and the previous steps are repeated, starting from the identification step. The mobile station selects the layer most appropriate to the speed at which it is travelling.
    Type: Grant
    Filed: July 12, 1995
    Date of Patent: December 23, 1997
    Assignee: France Telecom
    Inventors: Sami Tabbane, Christophe Moreau
  • Patent number: 5701585
    Abstract: Several mobile assisted handoff methods for use in the cellular communication system comprising a plurality of cells are disclosed. First, the quality level of a cell a mobile station is presently using is measured to determine whether the quality level is above or below a threshold. If the quality level is below the threshold, a primary list of cells is assigned to the mobile station, whereas if the quality level is above the threshold, a secondary list of cells is assigned to the mobile station. The quality level of each of the assigned cells is then measured by the mobile station and reported to the communication system.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: December 23, 1997
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Harald Kallin, Anna Fallgren