Patents Examined by Benedict V. Safourek
  • Patent number: 5822313
    Abstract: A technique is disclosed for allowing a seamless handover between base stations in a TDMA controller as a telephone handset is transported from one base station's area to another. The disclosed circuitry enables the TDMA controller to assess the quality of the handover before switching to the new base station. When it is determined that a handover operation is to commence, transmissions are made in the original slot time and a handover slot time within the same frame. Also during the same frame, data is received at two separate slot times. Only when it is determined that the data received in the handover slot time contains no transmission errors is the handover completed by then only transmitting on the handover slot transmit time and receiving on the handover slot receive time. In the preferred embodiment, it is determined whether the received data contains no transmission errors by detecting the CRC codes, the signal strength, and the existence of any invalid words.
    Type: Grant
    Filed: May 24, 1996
    Date of Patent: October 13, 1998
    Assignee: National Semiconductor Corporation
    Inventors: Charles J. Malek, David L. Weigand, Dennis M. Rose, Gerard G. Socci
  • Patent number: 5818880
    Abstract: A telemetry transmitter having a dielectric resonator for frequency stabilization, a frequency or phase shift keying modulator and a high efficiency power amplifier. The transmitter can be implemented on gallium arsenide or other kinds of substrates The transmitter is of monolithic microwave integrated circuit (MMIC) technology. The transmitter may obtain its power from a power supply of a local or an associated system, thus not needing an integral power supply of its own.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: October 6, 1998
    Assignee: Honeywell Inc.
    Inventors: Jeffrey J. Kriz, Dennis D. Ferguson
  • Patent number: 5815505
    Abstract: A communications device is presented which is configured to provide selective signal processing at a "plain old telephone service" (POTS) interface, an ISDN U interface, or an ISDN S/T interface. A first POTS connector allows the communications device to be connected to an analog POTS telephone line. A second ISDN U connector allows the communications device to be connected to an ISDN network at an ISDN U interface point. A third ISDN S/T connector allows the communications device to be connected to an ISDN network at an ISDN S/T interface point.
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: September 29, 1998
    Assignee: Advanced Micro Devices, Inc.
    Inventor: Andrew Mills
  • Patent number: 5812546
    Abstract: The demodulator has a plurality of matched filters in parallel. Each matched filter has a different binary PN code, a plurality of sample holders, a plurality of multipliers, an adder, and a controller. The sample holders has a common input, a switch, a first capacitor, a first inverse amplifier with an output and an input connected to the common input through the switch and the capacitor, and a first feedback capacitor for feeding the output of the first inverse amplifier back to the input. Each multiplier has a first and second sub-multiplexers, one of sub-multiplexer selecting corresponding sample holder output and another sub-multiplexer selecting a reference voltage.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: September 22, 1998
    Assignees: Yozan, Inc., Kokusai Electric Co., Ltd.
    Inventors: Changming Zhou, Guoliang Shou, Xuping Zhou, Makoto Yamamoto, Kenzo Urabe, Sunao Takatori
  • Patent number: 5812542
    Abstract: A method (250) determines weighting coefficients (188, 190, 192) in a code division multiple access (CDMA) radio receiver (100). A representation (172) of a desired RF signal (166) is received (108, 124, 127). A plurality of data signals (176, 180, 184) are generated responsive to the representation (172) of a desired RF signal (166). A plurality of pilot signals (178, 182, 186) are generated responsive to the first representation (172) of a desired RF signal (166). A total received signal power (174) is measured (128). A plurality of weighting coefficients (188, 190, 192) are determined responsive to the plurality of data signals (176, 180, 184), the plurality of pilot signals (178, 182, 186) and the total received signal power (174).
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: September 22, 1998
    Assignee: Motorola, Inc.
    Inventors: Eugene J. Bruckert, Fuyun Ling
  • Patent number: 5812532
    Abstract: In order to establish virtual channel networks on an ATM network, a different virtual channel handler interconnection network for each media or service consisting of information to be transferred is established on a virtual path network; and virtual channel networks corresponding to these media or services are formed by the respective virtual channel handler interconnection networks, whereby a plurality of independent virtual channel networks for different media or services are established simultaneously on a single physical network.
    Type: Grant
    Filed: August 31, 1995
    Date of Patent: September 22, 1998
    Assignee: Nippon Telegraph & Telephone Corporation
    Inventors: Eiji Oki, Naoaki Yamanaka
  • Patent number: 5812545
    Abstract: A satellite communications system is provided for full mesh connectivity between a number of earth terminals via a satellite link. The earth terminals are connected to user access devices to receive and transmit voice, video and data and are operable to generate bursts to transmit user data via a satellite, and to process data received from the satellite and transmit it to the addressed user access devices. The terminals each comprise a programmable computing device which prioritizes data into bursts using a fragmentation protocol. The programmable computing device also organizes bursts in at least one of a plurality of slots constituting a time division multiple access frame in accordance with a burst plan. Each terminal has access to a guaranteed number of the slots. The allocation of the remaining slots among the terminals varies dynamically to increase or decrease the burst transmission rates of the terminals as needed.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: September 22, 1998
    Assignees: Orion Atlantic, L.P., Nortel Dasa Network Systems GmbH & Co.
    Inventors: Burt Liebowitz, Steven Sweeney, Heinrich Arens, Franz Thaller
  • Patent number: 5809021
    Abstract: A multi-service switch for a telecommunications network (10) is provided. A system bus (13) has an ingress portion (14) and an egress portion (16). The system bus (13) is operable to carry data in a plurality of time slots. A system bus control (11) comprises a head-of-bus control (12) having an output. The output of the head-of-bus control is coupled to the ingress portion (14) of the system bus (13). The system bus control (11) also comprises a tail-of-bus control (15) coupled to the head-of-bus control (12). The tail-of-bus control (15) has an input coupled to the egress portion (16) of the system bus (13). A plurality of interface modules (28.sub.1 through 28.sub.n) each have an input and an output. The input of each interface module (28.sub.1 through 28.sub.n) is coupled to the egress portion (16) of the system bus (13), and the output of each interface module is coupled to the ingress portion (14) of the system bus (13). An ingress/egress bridge (18) has an input and an output.
    Type: Grant
    Filed: June 10, 1996
    Date of Patent: September 15, 1998
    Assignee: DSC Communications Corporation
    Inventors: Felix V. Diaz, Raymond L. Hogg, Daniel J. Raz, Kathy Ann Thompson, Gregory L. Langdon, W. Keith Brewer
  • Patent number: 5809032
    Abstract: A receive SONET line interface includes an elastic store which receives and stores incoming signals from a pointer tracking circuit and retrieves stored signals for providing to a pointer generating circuit wherein, for both the pointer tracking and pointer generating circuits, separate state memories are provided for keeping track of the state of previous state pointer tracking and generating signals in time slots of repetitive frames of an incoming SONET signal.
    Type: Grant
    Filed: January 15, 1997
    Date of Patent: September 15, 1998
    Assignee: Alcatel Network Systems, Inc.
    Inventors: William B. Weeber, Ertugrul Baydar, Sahabettin C. Demiray
  • Patent number: 5809013
    Abstract: Information in the form of redundant message packets is sent between a remote device and a host device, e.g., a wireless security system. In order to conserve energy, the frequency of trigger events in the remote device is determined, and the number of redundant message packets sent is based on the determined frequency.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: September 15, 1998
    Assignee: Interactive Technologies, Inc.
    Inventor: Gerald M. Kackman
  • Patent number: 5805586
    Abstract: A control station (8) is coupled to a plurality of tributary devices (20, 16, 18) by way of at least one high speed broadcast downstream data channel and more than one shared lower speed upstream data channels. The control station (8) broadcasts data to all the tributary devices (20, 16, 18) and selects a channel for a specific tributary device (20, 16, 18) to respond to a poll. After polling, the tributary device (20, 16, 18) changes the tributary device transmitter (42) to the frequency of the selected channel. The tributary device (20, 16, 18) either sends data to send to the control station (8) or sends a negative acknowledge to the control station (8). If a negative acknowledgment was transmitted, the control station (8) notifies the control station transmitter that the channel is idle.
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: September 8, 1998
    Assignee: Motorola Inc.
    Inventors: John A. Perreault, Abhay Joshi, Mete Kabatepe, Lawrence W. Lloyd, Stephen Schroeder
  • Patent number: 5805596
    Abstract: In a backplane architecture for a logical stackable Ethernet repeater for an Ethernet network having a plurality of stackable repeater modules, each one of the stackable repeater modules being connectable via bus-type signal lines to one another for communicating packets via bus-type signal lines, and each one of said stackable repeater modules including a plurality of ports for connection to stations, a method is provided for communicating management information wherein a management module collects information about packets on the backplane from repeater modules, and the repeater modules transmit packet information only via bus-type signal lines. In a specific embodiment, transmitting comprises appending after each packet at each source port of each repeater module an information footer having a select number of information units, and conveying each packet with the information footer on the bus-type signal lines.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: September 8, 1998
    Assignee: 3 Com Corporation
    Inventors: David A. Kranzler, Wen-Tsung Tang, Edwin Ibe
  • Patent number: 5805581
    Abstract: A mobile communication system in which various access methods may be selected according to the user's priority. In the mobile communication system, each of mobile stations and radio base stations has a radio processor, which has TDMA, CDMA and FDMA communication units. The CDMA communication unit comprises channel coders each for performing a primary modulation to a transmitting signal, spread-spectrum code generators for respectively generating different spread-spectrum signals, a clock generator/controller for controlling the generation of chip clocks to control the generation of the spread-spectrum codes, oscillators for setting different carrier frequencies to outputs calculated as products, and a CPU for generally controlling various parts or elements to control the assignment of a CDMA signal or a TDMA signal to an arbitrary time slot transmitted from the TDMA communication unit.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: September 8, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshinori Uchida, Kenichi Ishida, Takashi Kashiwagi
  • Patent number: 5802044
    Abstract: The present invention provides a communication system, device and method of reverse link symbol timing synchronization of transmited signals to facilitate reverse link timing synchronization. A base unit transmits a forward link signal, receives a reverse link signal, and determines a timing offset for signals received on a reverse link timing synchronization channel, wherein the reverse link synchronization channel comprises a plurality of adjacent reverse link carrier frequencies that are utilized by a multicarrier subscriber unit to facilitate reverse link symbol timing synchronization.
    Type: Grant
    Filed: April 26, 1996
    Date of Patent: September 1, 1998
    Assignee: Motorola, Inc.
    Inventors: Kevin Baum, James Robert Kelton, Phillip David Rasky
  • Patent number: 5802047
    Abstract: When a host connected to physical ports carries out communication outside virtual LANs formed by grouping the physical ports, a CPU for a switch determines a MAC address of the router as a destination MAC address corresponding to logic ports grouped in the same virtual LAN including a receive port to receive a packet and writes the packet and a virtual LAN number attached thereto into a first buffer for switch-router communication. A CPU for a router writes the packet written in the first buffer for switch-router communication along with the virtual LAN number into a second buffer for switch-router communication. The CPU for the switch writes the packet written in the second buffer for switch-router communication into a third buffer for physical port transmit-receive to transmit the packet to the physical ports.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: September 1, 1998
    Assignee: NEC Corporation
    Inventor: Hiroyuki Kinoshita
  • Patent number: 5802068
    Abstract: By constructing a plurality of packs from a first packet including first data having a high bit rate and a second packet including second data having a low bit rate, when the first data and the second data are multiplexed, it is first detected whether a data length of second data is smaller than a maximum data length of second packet or not. Subsequently, when it is detected that the data length of second data is smaller than the maximum data length of second packet, one pack is constructed by a redundancy data packet including redundancy data of a data length which is equal to a difference between the maximum data length of second packet and the data length of second data and the second packet.
    Type: Grant
    Filed: June 25, 1996
    Date of Patent: September 1, 1998
    Assignee: Nippon Steel Corporation
    Inventor: Yoshinobu Kudo
  • Patent number: 5802049
    Abstract: A route is selected such that a cell pass through the SRM at the second stage that has the smallest free band when the call requested by the subscriber is to be processed for the point-to-point connection, thereby exercising control such that routes having larger band are reserved. A route is selected such that a cell pass through the SRM at the second stage that has the largest free band when the call requested by the subscriber is to be processed for the multicasting connection, thereby exercising control to avoid contentions between the route selected for the multicasting connection and the route selected for the point-to-point connection.
    Type: Grant
    Filed: June 4, 1996
    Date of Patent: September 1, 1998
    Assignee: Fujitsu Limited
    Inventor: Yoshihiro Watanabe
  • Patent number: 5799001
    Abstract: A composite network protective/recovering device includes first to fourth input/output (I/O) modules. The first and third I/O modules are operational modules and the second and fourth I/O modules are protective modules. A first span connection group connects the first I/O operational module with the second I/O protective module. A second span connection group connects the third I/O operational module with the fourth I/O protective module to perform span switching. A first bidirectional line switching ring connects the first I/O operational module and the third I/O operational module to form a bidirectional ring which has two lines in each direction. A second bidirectional line switching ring is connected to the first to fourth I/O modules to form transmitting/receiving operational lines which include two lines in each direction and protective lines which include two lines in each direction.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: August 25, 1998
    Assignees: Electronics and Telecommunication Research Institute, Korea Telecommunications Authority
    Inventors: Dong Choon Lee, Jae Guen Kim, Ho Geon Kim, Ho Jae Lee
  • Patent number: 5799013
    Abstract: A method and device are disclosed that utilize a spread spectrum coding process for processing a signal having first and second time portions to achieve unequal error protection of the time portions by variably modulating the power of one segment relative to the second segment. In such a signal, the first segment contains information that is more significant, i.e., more sensitive to error, than the second segment and the power modulator increases the average power of the signal during the first time portion relative to the average power of the signal during the second time portion. Preferably, the power increase of the first time portion is proportional to the power decrease of the second time portion so as to maintain overall system power requirements. The method and device are particularly suited for a digital cellular telephone systems such as DS-CDMA. In such a system, the signal is spread by a single spreading sequence.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: August 25, 1998
    Assignee: Lucent Technologies, Inc.
    Inventors: Nambirajan Seshadri, Carl-Erik Wilhelm Sundberg
  • Patent number: 5799004
    Abstract: A mobile station, and a method for eliminating multiple-access interference in a CDMA cellular radio system having a plurality of cells each having at least one base station communicating with mobile stations residing in the respective cell and informing the respective mobile stations of at least one spreading code used in a neighboring cell, the mobile stations measuring the code phase and power level of a channel of the neighboring cell using the known spreading code. To reduce the effect of multiple-access interference, the signal received at the mobile station is utilized in the detection of the desired signal by using the code phase and power level of the measured channel using the known spreading code of the neighboring cell.
    Type: Grant
    Filed: July 2, 1996
    Date of Patent: August 25, 1998
    Assignee: Nokia Telecommunications
    Inventors: Ilkka Keskitalo, Arto Kiema, Jari Savusalo, Petri Jolma