Patents Examined by Benedict V. Safourek
  • Patent number: 5784376
    Abstract: An adaptive burst multiplexing system using dynamic deadline computation serializes data from source units. It comprises interface circuits for accumulating in a buffer memory a quantity of data from a corresponding source unit. An empty frame generator circulates a series of frames around a ring through the interface circuit. Each interface circuit computes a deadline beyond which its buffer memory may become saturated and places this deadline in a passing empty frame. When this frame returns to the frame generator it contains the identifier of the interface circuit that put in it the earliest deadline. The generator transmits an empty frame over the ring with the identifier of this interface circuit which then recognizes its authorization to transfer data accumulated in its memory.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: July 21, 1998
    Assignee: Alcatel N.V.
    Inventor: Jean-Yves Le Gall
  • Patent number: 5781541
    Abstract: An arrangement (apparatus and method) for providing a code division multiple access (CDMA) transmission system in an urban environment using spatially-diverse antennas and time-diversity devices and techniques to provide improved cell coverage without the detrimental effects of multipath (Rayleigh) fading. The spatially-diverse antennas output identical CDMA-modulated signals to a serving area at different times, whereby each CDMA-modulated signal output from a corresponding antenna has a sufficent delay to avoid mutual interference with the identical CDMA-modulated signals output from other antennas. The delay assigned to each antenna is within a range greater than a chip interval, and less than or equal to a base station sequence offset between base stations. As a result, a subscriber station is able to separately demodulate the received CDMA-modulated signals from the different antennas as CDMA signals having adequate multipath delay for demodulation using a rake receiver.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: July 14, 1998
    Assignee: Bell Atlantic Network Services, Inc.
    Inventor: Allan Schneider
  • Patent number: 5781542
    Abstract: A system adaptively determines the number of spread codes to use and a type of multi-valued modulation system based on the station of the system. Transmission information is divided into a number of sequences equal to the number of used spread codes. These sequences are error correction encoded, primarily modulated according to a selected one of a plurality of types of multi-valued modulation schemes, secondarily modulated by the selected spread codes, and transmitted.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: July 14, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hirokazu Tanaka, Tatsunori Saito
  • Patent number: 5781537
    Abstract: An efficient distributed technique for setting up, taking down, and updating connections in a communications network, which is robust in the presence of failures. More specifically with this invention a path for a connection is computed and reservation requests are simultaneously sent through separate channels to each of a set of nodes of the path for the connection to reserve and determine if resources are available for the connection. Upon acknowledgement that the links for the connection are available and have been reserved, a setup message is sequentially transmitted between the adjacent nodes along the path until the setup messages reaches the destination node. The switches in each node then configure themselves in response to the setup message so as to establish the connection.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: July 14, 1998
    Assignee: International Business Machines Corporation
    Inventors: Rajiv Ramaswami, Adrian Segall
  • Patent number: 5781534
    Abstract: An information gathering mechanism efficiently acquires information about a path interconnecting a source node and a destination node in a computer network. The mechanism comprises a novel packet configuration for soliciting parameters pertaining to network characteristics from routers coupled to the path. This novel probe packet preferably has a flexible format so that it may be processed not only by routers configured to interpret this type of packet, but also those that are incapable of either supplying some of the parameters or, further, deciphering any of the contents of the packet.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: July 14, 1998
    Assignee: Novell, Inc.
    Inventors: Radia J. Perlman, Neal D. Castagnoli
  • Patent number: 5774466
    Abstract: A regulation apparatus for ATM cell delay variation includes a variation regulating buffer for temporarily storing cells transferred thereto, a variation waiting timer for controlling a waiting time which extends from reception of the first cell to read-out of cells from the buffer, a read-out timer for controlling intervals at which cells are read from the buffer, a latest cell preservation memory for storing the latest cell transferred from a VPI/VCI demultiplexing unit and, a selector for selecting a cell stored in the buffer or in the memory to transfer the selected cell to a cell reproduction unit.
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: June 30, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Shinichi Hamamoto, Masashi Hiraiwa, Atsuo Hatono
  • Patent number: 5774459
    Abstract: Methods that enable the simple management of the unilateral exchanges of messages between a highly simplified set of transmitters and a single receiver, this transmission being done on a single channel.It consists in providing for the transmission, by the receiver (100), of the simplest possible binary signal indicating that the channel is busy as soon as a message from one of the transmitters is detected. Reception of said signal by the other transmitters (102-104) prevents them from transmitting. Risks of collision between messages from different transmitters are handled by a set of test (Tt) and standby (Tv, Ta, Tl) periods. The busy signal may be a simple modulated carrier in the case, for example, of microwave transmission.It provides for the efficient management of badge-based systems such as access control systems.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: June 30, 1998
    Assignee: Gemplus Card International
    Inventor: Bruno Charrat
  • Patent number: 5771231
    Abstract: An ATM exchange having an ATM switch for switching a cell, which has arrived from a prescribed incoming line, to a prescribed outgoing line based upon a VPI/VCI contained in the header of the cell is provided with a call processor for executing call processing control, and with a traffic processor for collecting traffic data. The call processor executes call processing control based upon a connect/disconnect request, and the traffic processor collects traffic data (NDC data, PM data, billing data) in a subscriber line or traffic data in a transmission line. This makes it possible to collect and edit traffic data and billing data without burdening the call processor.
    Type: Grant
    Filed: August 24, 1995
    Date of Patent: June 23, 1998
    Assignee: Fujitsu Limited
    Inventor: Yoshihiro Watanabe
  • Patent number: 5771229
    Abstract: The system operates in a wireless communication system (200) which has a plurality of wireless communication channels (501, 502) controlled by a switching center (212) and the system includes an intelligent peripheral (30) in communication with the switching center (212) and an inverse multiplexer (38) responsive to the intelligent peripheral (30). The inverse multiplexer (38) separates a broadband communication signal (100) into a plurality of portions (301, 302) and the intelligent peripheral (30) causes the switching center (212) to transmit a first portion (301) of the broadband communication signal (100) over a first wireless communication channel (501) and to transmit a second portion of the broadband communication signal (302) over a second wireless communication channel (502). The switching center (212) controls the first wireless communication channel (501) independently of the second wireless communication channel (502).
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: June 23, 1998
    Assignee: Motorola, Inc.
    Inventor: Charles D. Gavrilovich
  • Patent number: 5768264
    Abstract: A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user stations communicate with one or more base stations to place and receive telephone calls, in which the user stations are provided a secure voice or data link and have the ability to handoff calls between base stations while such calls are in progress. Each base station has a set of "air channels" to which it transmits in sequence. The air channels supported by each base station are called that base station's "polling loop". A user station receives general polling information on an unoccupied air channel, transmits responsive information to the base station, and awaits acknowledgment from the base station. Each base station may therefore simultaneously maintain communication with as many user stations as there are air channels in its polling loop.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 16, 1998
    Assignee: Omnipoint Corporation
    Inventors: Gary B. Anderson, Ryan N. Jensen, Sherman Gavette, James Brick
  • Patent number: 5768279
    Abstract: A broad band broadcasting transmission system for sending broad band downstream data and telephone signals from a central office to a number subscriber set top terminal. Each frame of data is marked to indicate the set top terminals it is to be received by. A downstream light fiber is located between the head office and a curbside box. A transmitter transmits the frames along a light fiber to a SAC box. A converter converts the light signals from the light fiber to electrical signals. A distribution line coupled to the curbside box carries the electrical signals to a plurality of drop line twisted pair conductors connected to the distribution line. The drop lines are coupled via a residential units to the set top terminals.
    Type: Grant
    Filed: January 25, 1994
    Date of Patent: June 16, 1998
    Assignee: IBM Corporation
    Inventors: Belwinder S. Barn, Joe Geofroy, Piyush Bhupatrai Kothary, Christopher Michael Look
  • Patent number: 5768269
    Abstract: A method and apparatus for carrying out synchronous codivision multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media such as a cable television system coaxial cable, a fiber optic or copper conductor telephone link, terrestial microwave, satellite link, local or wide area network, wireless including cellur network or some combination of these media using suitable interface circuitry. The system includes modems at remote units and a central unit to receive time division multiplexed digital data arranged into timeslots or channels and uses orthogonal codes to encode each channel of multiple data and spread the energy of each channel data over a frame of data transmitted in the code domain. Spreading the data this way makes the system less susceptible to impulse noise.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: June 16, 1998
    Assignee: Terayon Corporation
    Inventors: Selim Shlomo Rakib, Yehuda Azenkot
  • Patent number: 5768261
    Abstract: Described herein are a system and method of determining a far-end format of a customer service unit (CSU) operating using an Extended SuperFrame (ESF) framing format. The CSU is in communication with a network element over a DS 1 circuit. The system operates by determining whether any performance data was received from the CSU during a preceding time interval. If no performance data was received from the CSU during the preceding time interval, then the system determines whether the network element is currently configured to operate according to ANSI standard T1.403 or AT&T Recommendation 54016. If the network element is currently configured to operate according to AT&T Recommendation 54016, then the system commands the network element to operate according to ANSI standard T1.403. The system then waits a predetermined time period for receipt of valid performance data conforming to ANSI standard T1.403 from the CSU. If valid performance data conforming to ANSI standard T1.
    Type: Grant
    Filed: June 25, 1996
    Date of Patent: June 16, 1998
    Assignee: MCI Communications Corporation
    Inventors: Curtis Brownmiller, Mike Bencheck, Minh Tran, Robert Branton, Mark DeMoss, Steve Landon
  • Patent number: 5768277
    Abstract: An automatic ID assigning device for LAN instruments connected in a network assigns ID numbers from a master LAN instrument to respective slave LAN instruments connecting sequentially to the master LAN instrument. A first slave LAN instrument stores, as its own self ID, an ID number supplied in an ID assignment command signal supplied from the master LAN instruments through a data line connecting ports of respective slave LAN instruments. The slave LAN instrument returns an ID assignment acknowledging signal to the master LAN instrument and connects upper and lower ports of the slave LAN instrument together. The master LAN instrument updates a connecting number table of the ports of the slave IDs upon receipt of the assignment acknowledging signals and transmits a subsequent ID assigning command signal to another slave LAN instrument through the data line and through the connected ports of slave LAN instruments to which ID numbers have already been assigned. The upper and lower ports, i.e.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: June 16, 1998
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Masami Ohno, Osamu Iijima, Yasuhiko Mizoguchi, Akira Matsuzaki, Junko Nakano
  • Patent number: 5768270
    Abstract: An ATM switch includes linewise switching matrices each having m inputs and n outputs (mvn), and a synchronous interconnection network linking incoming lines of the ATM switch to the inputs of the matrices, the outputs of the matrices being linked to respective outgoing lines of the ATM switch. The synchronous interconnection network includes: k successive stages of groupwise elementary synchronous switches each having at least one and at most p groups of m inputs and at least one and at most p groups of m inputs and at least one and at most p groups of m outputs; groups of m lines each linking a group of m outputs of a groupwise elementary synchronous switch to a group of m inputs of a groupwise elementary synchronous switch of the following stage; and groups of m lines each linking a group of m outputs of a groupwise elementary synchronous switch of the last stage to the m inputs of a linewise switching matrix.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: June 16, 1998
    Assignee: FIHEM
    Inventor: Tuan Ha-Duong
  • Patent number: 5768254
    Abstract: A method and system for reducing co-channel interference (CCI) in multiple access communication by providing complete or partial cancellation of a mixed CCI interfering signal in a system base station. An exemplary system includes first and second base stations communicating with users in first and second cells, respectively. The first base station transmits a downlink signal to a user in the first cell. The downlink signal is also a mixed CCI interfering signal in that it interferes with reception of an uplink signal in the second base station. A cancellation signal representative of the interfering signal is supplied along a transmission path from the first base station to the second base station. The second base station utilizes the cancellation signal to reduce the effect of the interfering signal on a received composite signal by, for example, combining the cancellation signal or a suitably processed version thereof with the received composite signal.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: June 16, 1998
    Assignee: Lucent Technologies Inc.
    Inventors: Haralabos C. Papadopoulos, Carl-Erik Wilhelm Sundberg
  • Patent number: 5764624
    Abstract: An ATM switching system at each node of a network performs route changing or rerouting promptly when a failure occurs. In each of ATM switching systems at nodes N1 to N6: a route table 21 of a line interface 102 is set with conversion header information of a normal route, and an alternate routing table 25 is set with header information of one or more alternate routes. Subsequently, each line interface tests, when a packet arrives, whether or not a failure has occurred in an output line involved in the normal route, by referring to a bitmap 264 storing failure lines and a VP failures. The line interface executes header conversion by applying the normal header information stored in the routing table 21 in the case of no failure set for the normal route and by applying the header information stored in the alternate routing table 25 in case a failure has occurred on the normal route, and then outputs the packet to an ATM switch 101.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: June 9, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Noboru Endo, Masataka Takano
  • Patent number: 5764643
    Abstract: An ISDN interface unit interconnects a data processing unit, an ISDN, and an analog telephone and comprises a DMA request signal generation circuit for generating a DMA request signal from an 8 kHz clock signal from an ISDN line. In accordance with the request signal, PCM coded data input from the ISDN line is transferred, using DMA, to a memory of the data processing unit or vice versa, or the ISDN interface unit comprises a code conversion circuit, data stored in the data processing unit are converted to nonlinear PCM coded data and transmitted to the ISDN line or vice versa. Further, the ISDN interface unit comprises communication functions for the digital signal and for the voice band signal, a control channel signal sent from the ISDN line is interpreted, and one of the communication functions can be selected.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: June 9, 1998
    Assignee: Fujitsu Limited
    Inventors: Tomoyoshi Takebayashi, Toshihiro Azami, Ryuichi Matsukura, Hiroki Hasegawa, Satoshi Okuyama
  • Patent number: 5764630
    Abstract: A spread spectrum CDMA communication system in which a base station communicates with a plurality of subscriber terminals and the base signal transmitted by the base station is comprised of a set of substantially orthogonal functions which are overlaid with a pseudo-noise (PN) sequence forming a coded spreading sequence for an information signal, each orthogonal function of the set carries data for a single user in the system. Information signals are modulated onto the carrier to form a transmit signal and the coded spreading sequence on the transmit signal for broadcasting, each subscriber terminal having a receiver for coherently demodulating the base station signal. A plurality of correlators, each respectively tuned to different functions of the orthogonal signal set, are each followed by an appropriate nonlinearity for removing the data modulation. The summed output of the correlators is used to improve the estimate of carrier phase over that obtained with a single correlator.
    Type: Grant
    Filed: March 25, 1996
    Date of Patent: June 9, 1998
    Assignee: Stanford Telecommunications, Inc.
    Inventors: Francis D. Natali, John Ohlson
  • Patent number: 5757789
    Abstract: A method and apparatus of communicating information using Time Division Multiple Access and adaptive transmission and reception are disclosed. Signal bursts are transmitted from TDMA transmitters to a TDMA receiver wherein the transmitter codes the information and transmits coded information to the receiver using at least one of two timeslots of a plurality of timeslots in a repetitive TDMA frame period. Both of the two timeslots are received whether or not the transmitter has transmitted using one or two timeslots and the received signals are classified as intended and non-intended. Successively received signals classified as intended are then assembled into a block for decoding to reproduce the information.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: May 26, 1998
    Assignee: Ericsson Inc.
    Inventor: Paul W. Dent