Push-pull Patents (Class 455/332)
-
Patent number: 11128598Abstract: Computerized methods and systems determine LAP and UAP values of the MAC address of electronic devices. A memory stores LAP records. Each LAP record has at least: an LAP value associated with an electronic device, and candidate UAP values associated with the LAP value. A packet processor modifies the LAP records by updating the candidate UAP values based on information associated with packets received from electronic devices. A probing manager modifies each LAP record by updating each LAP record to include a determined UAP value selected from the candidate UAP values based on attempts to connect to an electronic device of the electronic devices using selected candidate LAP-UAP value pairs. Each pair has the LAP value of the LAP record and a selected one of the candidate UAP values that is selected based on one or more computed metrics associated with the candidate LAP-UAP value pairs.Type: GrantFiled: April 21, 2021Date of Patent: September 21, 2021Assignee: CYBERTOKA Ltd.Inventors: Yuval Solodnik, Baruch Weizman
-
Patent number: 11063899Abstract: Computerized methods and systems determine LAP and UAP values of the MAC address of electronic devices. A memory stores LAP records. Each LAP record has at least: an LAP value associated with an electronic device, and candidate UAP values associated with the LAP value. A packet processor modifies the LAP records by updating the candidate UAP values based on information associated with packets received from electronic devices. A probing manager modifies each LAP record by updating each LAP record to include a determined UAP value selected from the candidate UAP values based on attempts to connect to an electronic device of the electronic devices using selected candidate LAP-UAP value pairs. Each pair has the LAP value of the LAP record and a selected one of the candidate UAP values that is selected based on one or more computed metrics associated with the candidate LAP-UAP value pairs.Type: GrantFiled: January 12, 2021Date of Patent: July 13, 2021Assignee: CYBERTOKA Ltd.Inventors: Yuval Solodnik, Baruch Weizman
-
Patent number: 10349422Abstract: In one embodiment, a server of a first wireless communication network receives a wireless communication originated by a terminal of the first wireless communication network, the wireless communication containing a current geographic location of the terminal as determined by the terminal. The server may then determine acceptable communication parameters for the terminal to communicate on the first wireless communication network, e.g., based on preventing transmission by the terminal that might interfere with operation of one or more unintended receivers. The server then generates an instruction message for the terminal based on the acceptable communication parameters, and transmits the instruction message toward the terminal to cause the terminal to only continue transmitting according to acceptable communication parameters.Type: GrantFiled: March 10, 2017Date of Patent: July 9, 2019Assignee: Higher Ground LLCInventors: Robert S. Reis, Mark E. Russell, Shmuel Shaffer
-
Patent number: 9143269Abstract: 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: GrantFiled: June 12, 2014Date of Patent: September 22, 2015Assignee: Hitachi, Ltd.Inventors: Kenzaburo Fujishima, Masanori Taira
-
Patent number: 8805274Abstract: 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: GrantFiled: January 25, 2007Date of Patent: August 12, 2014Assignee: Thomson LicensingInventors: John James Fitzpatrick, Lincheng Xiu
-
Patent number: 8688055Abstract: 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: GrantFiled: December 28, 2012Date of Patent: April 1, 2014Assignee: Marvell World Trade Ltd.Inventors: Brian T. Brunn, Sehat Sutardja, Xiaohua Fan, Gregory T. Uehara
-
Patent number: 8472958Abstract: 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: GrantFiled: August 20, 2009Date of Patent: June 25, 2013Assignee: Fujitsu LimitedInventors: Takayoshi Ode, Kazuo Kawabata
-
Patent number: 8432899Abstract: 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: GrantFiled: February 22, 2007Date of Patent: April 30, 2013Assignee: Aylus Networks, Inc.Inventor: Shamim A. Naqvi
-
Patent number: 8346179Abstract: 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: GrantFiled: May 3, 2010Date of Patent: January 1, 2013Assignee: Marvell World Trade Ltd.Inventors: Brian Brunn, Sehat Sutardja, Xiaohua Fan, Gregory Uehara
-
Patent number: 8219131Abstract: 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: GrantFiled: January 7, 2008Date of Patent: July 10, 2012Assignee: Hitachi, Ltd.Inventors: Ryouji Yamaoka, Junji Yamamoto, Koji Wakayama, Seishi Hanaoka, Takehiro Morishige, Masashi Yano, Toshiaki Suzuki, Satoshi Yoshizawa
-
Patent number: 7990925Abstract: 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: GrantFiled: May 29, 2008Date of Patent: August 2, 2011Assignee: QUALCOMM IncorporatedInventors: Peerapol Tinnakornsrisuphap, Fatih Ulupinar, Jun Wang, Parag Arun Agashe
-
Patent number: 7912440Abstract: 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: GrantFiled: November 10, 2005Date of Patent: March 22, 2011Assignee: ST-Ericsson SAInventor: Willem Hendrik Groeneweg
-
Patent number: 7903762Abstract: 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: GrantFiled: January 30, 2007Date of Patent: March 8, 2011Assignee: Realtek Semiconductor Corp.Inventor: Chia-Liang Lin
-
Patent number: 7729678Abstract: 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: GrantFiled: July 19, 2005Date of Patent: June 1, 2010Assignee: Semiconductor Ideas to Market (ITOM) BVInventor: Wolfdietrich Georg Kasperkovitz
-
Patent number: 7693539Abstract: 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: GrantFiled: November 4, 2003Date of Patent: April 6, 2010Assignee: NTT DoCoMo, Inc.Inventors: Mayu Yamada, Takehiro Nakamura, Minami Ishii, Masafumi Usuda, Sung Uk Moon, Akihito Hanaki
-
Patent number: 7657247Abstract: 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: GrantFiled: December 6, 2006Date of Patent: February 2, 2010Assignee: Marvell International Ltd.Inventors: King Chun Tsai, Lawrence Tse
-
Patent number: 7505751Abstract: 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: GrantFiled: February 9, 2005Date of Patent: March 17, 2009Assignee: Autocell Laboratories, Inc.Inventor: Floyd Backes
-
Patent number: 7415262Abstract: 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: GrantFiled: March 29, 2004Date of Patent: August 19, 2008Assignee: Intel CorporationInventors: Jiewen Liu, Chih C. Tsien
-
Patent number: 7411931Abstract: 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: GrantFiled: March 3, 2004Date of Patent: August 12, 2008Assignee: Nokia CorporationInventors: Harri Holma, Antti Toskala
-
Patent number: 7200633Abstract: 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: GrantFiled: August 23, 2001Date of Patent: April 3, 2007Assignee: NTT DoCoMo, Inc.Inventors: Shunichi Sekiguchi, Minoru Etoh
-
Patent number: 7177619Abstract: 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: GrantFiled: January 25, 2005Date of Patent: February 13, 2007Assignee: International Business Machines CorporationInventor: Edward J. Nowak
-
Patent number: 7177620Abstract: 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: GrantFiled: March 14, 2003Date of Patent: February 13, 2007Assignee: Marvell International Ltd.Inventors: King Chun Tsai, Lawrence Tse
-
Patent number: 6778132Abstract: 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: GrantFiled: February 13, 2003Date of Patent: August 17, 2004Assignee: i f m electronic GmbHInventor: Jaromir Palata
-
Patent number: 6741587Abstract: 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: GrantFiled: April 2, 2002Date of Patent: May 25, 2004Assignee: Nokia CorporationInventors: Harri Holma, Antti Toskala
-
Publication number: 20020146998Abstract: 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: ApplicationFiled: February 28, 2002Publication date: October 10, 2002Applicant: FUJITSU LIMITEDInventors: Wakako Hoshino, Noriaki Shirai
-
Patent number: 6437659Abstract: 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: GrantFiled: May 31, 2000Date of Patent: August 20, 2002Assignee: DaimlerChrysler AGInventor: Peter Nuechter
-
Publication number: 20010016482Abstract: 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: ApplicationFiled: December 29, 2000Publication date: August 23, 2001Inventors: Karl Olof Joakim Bergstrom, Thomas Rimhagen
-
Patent number: 6141552Abstract: 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: GrantFiled: November 17, 1997Date of Patent: October 31, 2000Assignee: Nortel Networks CorporationInventors: Andrew Sendonaris, Hongyi Chen, Nikhil Jain, Seshagri Madhavapeddy, Sairam Subramanian
-
Patent number: 6138000Abstract: 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: GrantFiled: August 21, 1995Date of Patent: October 24, 2000Assignee: Philips Electronics North America CorporationInventors: Nasrollah Saeed Navid, Ali Fotowat-Ahmady, Farbod Behbahani
-
Patent number: 6138016Abstract: 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: GrantFiled: December 4, 1996Date of Patent: October 24, 2000Assignee: Nortel Networks CorporationInventors: Jayant A. Kulkarni, Spencer Dawkins, Michael Hall
-
Patent number: 6052583Abstract: 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: GrantFiled: May 29, 1997Date of Patent: April 18, 2000Assignee: Northern Telecom LimitedInventor: Charles Bernardin
-
Patent number: 6029054Abstract: 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: GrantFiled: May 31, 1996Date of Patent: February 22, 2000Assignee: The United States of America as represented by the Secretary of the NavyInventor: Leo W. Lemley
-
Patent number: 6014551Abstract: 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: GrantFiled: July 16, 1997Date of Patent: January 11, 2000Assignee: Nokia Mobile Phones Ltd.Inventors: Mikko Pesola, Kari T. Lehtinen
-
Patent number: 5995830Abstract: 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: GrantFiled: April 9, 1997Date of Patent: November 30, 1999Assignee: AT&T Wireless Services Inc.Inventors: Umesh J. Amin, Bruce E. Rotvold
-
Patent number: 5987099Abstract: 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: GrantFiled: October 7, 1994Date of Patent: November 16, 1999Assignee: Northern Telecom LimitedInventors: 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: 5970408Abstract: 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: GrantFiled: May 2, 1997Date of Patent: October 19, 1999Assignee: Telefonaktiebolaget L/M Ericsson (publ)Inventors: Goran Carlsson, Marie Lambertsson, Glen Schmid
-
Patent number: 5911120Abstract: 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: GrantFiled: September 8, 1995Date of Patent: June 8, 1999Assignees: AT&T Wireless Services, Atmel CorpInventors: 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: 5870427Abstract: 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: GrantFiled: June 1, 1995Date of Patent: February 9, 1999Assignee: Qualcomm IncorporatedInventors: Edward G. Tiedemann, Jr., Alejandro Raul Holcman
-
Patent number: 5793842Abstract: 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: GrantFiled: February 27, 1995Date of Patent: August 11, 1998Inventors: Jerry R. Schloemer, Leo J. Aubel
-
Patent number: 5758266Abstract: 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: GrantFiled: September 30, 1994Date of Patent: May 26, 1998Assignee: QUALCOMM IncorporatedInventors: Richard K. Kornfeld, Charles E. Wheatley, III
-
Patent number: 5754945Abstract: 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: GrantFiled: January 18, 1996Date of Patent: May 19, 1998Assignee: Northern Telecom LimitedInventors: Jing-Yue Lin, Chang-Gang Zhang, Hong Zhao
-
Patent number: 5745481Abstract: 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: GrantFiled: June 3, 1996Date of Patent: April 28, 1998Assignee: Motorola, Inc.Inventors: W. Garland Phillips, Jheroen P. Dorenbosch, Terence Edward Sumner
-
Patent number: 5737328Abstract: 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: GrantFiled: October 4, 1995Date of Patent: April 7, 1998Assignee: Aironet Wireless Communications, Inc.Inventors: Stuart G. Norman, Marvin Sojka
-
Method for preventing calls of bad quality from being disconnected in a cellular mobile radio system
Patent number: 5737689Abstract: 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: GrantFiled: June 14, 1994Date of Patent: April 7, 1998Assignee: Telefonaktiebolaget LM EricssonInventor: Per Viktor Israelsson -
Patent number: 5734700Abstract: 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: GrantFiled: July 31, 1995Date of Patent: March 31, 1998Assignee: DeTe Mobil (Deutsche Tlelkom Mobilfunk GmbH)Inventors: Hans Hauser, Patrik Ljungstrom
-
Patent number: 5734699Abstract: 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: GrantFiled: May 4, 1995Date of Patent: March 31, 1998Assignee: interWAVE Communications International, Ltd.Inventors: Priscilla Marilyn Lu, Timothy Richard White
-
Patent number: 5734967Abstract: 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: GrantFiled: December 20, 1995Date of Patent: March 31, 1998Assignee: Motorola, Inc.Inventors: Michael D. Kotzin, Kenneth A. Stewart
-
Patent number: 5710974Abstract: 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: GrantFiled: May 15, 1996Date of Patent: January 20, 1998Assignee: Nokia Mobile Phones Ltd.Inventors: Seppo Granlund, Hannu Hakkinen, Seppo Hamalainen
-
Patent number: 5710986Abstract: 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: GrantFiled: March 15, 1996Date of Patent: January 20, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Arata Obayashi, Takumi Haga, Naoyuki Wakabayashi, Takashi Sakagawa
-
Patent number: 5708965Abstract: 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: GrantFiled: April 30, 1996Date of Patent: January 13, 1998Assignee: TRW Inc.Inventor: William F. Courtney