Patents Examined by Salvatore Cangialosi
  • Patent number: 6804194
    Abstract: A network switch for network communications includes a first data port interface which supports a plurality of data ports which transmit and receive data at a first data rate. A second data port interface is provided; the second data port interface supports a plurality of data ports transmitting and receiving data at a second data rate. A CPU interface is provided, with the CPU interface configured to communicate with a CPU. An internal memory is provided, and communicates with the first data port interface and the second data port interface. A memory management unit is provided, and includes an external memory interface for communicating data from at least one of the first data port interface and the second data port interface and an external memory. A communication channel is provided, with the communication channel communicating data and messaging information between the at least one first data port interface, the at least one second data port interface, the internal memory, and the memory management unit.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: October 12, 2004
    Assignee: Broadcom Corporation
    Inventors: Shiri Kadambi, Shekhar Ambe
  • Patent number: 6804234
    Abstract: A multiport switching device includes an Internal Rules Checker (IRC) that determines forwarding information for packets received at the device. The IRC uses an internal address lookup table to determine the forwarding information when the received packet conforms to version four of the Internet Protocol (IPv4). When the received packet has a longer destination address, consistent with version six of the Internet Protocol (IPv6), the IRC uses an externally located CPU to assist the IRC in determining the forwarding information.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: October 12, 2004
    Assignee: Advanced Micro Devices, Inc.
    Inventor: Peter Ka-Fai Chow
  • Patent number: 6801518
    Abstract: An asynchronous serial crosspoint switch is word synchronized to each of a number of transceiver circuits. The crosspoint switch circuit generates both a master bit clock and a master word clock signal. A transceiver circuit recovers the master bit clock signal from an incoming high-speed serial data stream using a clock and data recovery circuit. The recovered bit clock signal is used as a timing signal by which data is serialized and transmitted to the crosspoint switch circuit. The data stream transmitted to the switch circuit is frequency locked to the master bit clock signal, such that the serial data stream need only be phase adjusted with a data recovery circuit. To recover word timing, the switch circuit issues alignment words to the transceivers during link initialization. The transceivers perform word alignment and establish a local word lock. Alignment words are then reissued to the switch circuit using the local word clock.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: October 5, 2004
    Inventors: John P. Mullaney, Gary M. Lee
  • Patent number: 6798757
    Abstract: A session for a mobile station is established by finding a route and determining the availability of resources on the route. Thereafter, active per-hop behaviors (PHB's) are distributed to ports along the route while inactive PHB's are distributed to ports near the route. The active and inactive PHB's provide information on how to route, transport, and process packets belonging to a session. In one embodiment, each of the PHB's indicates a priority level, forwarding port number, rules for discarding packets, rules for sending packets, etc. The packets are transported from one port to another in accordance with the active PHB's, thereby guaranteeing a level of quality of service (QoS). When the mobile station moves to a new location and changes the route, inactive PHB's are activated on the new route. This not only allows mobile stations to communicate at a certain level of QoS even after a move, but also minimizes the delay resulting from the move.
    Type: Grant
    Filed: January 11, 2001
    Date of Patent: September 28, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Mika Mizutani, Shigeru Miyake
  • Patent number: 6795445
    Abstract: A hierarchical bandwidth management model for multiservice networks that provide management at a transport level and at a service/application level to provide increased network scalability without sacrificing bandwidth management efficiency and flexibility. In particular, in an Multiprotocol Label Switching (MPLS) environment, a method of hierarchical bandwidth management in a multiservice network supporting various quality of service levels (e.g. EF, AF1, AF2, BE) and a number of applications (e.g. ATM, MPLS, IP, FR) is disclosed. The method includes the steps of: establishing a transport connection tunnel (e.g. an E-Label Switched Path(LSP)) between pairs of the edge nodes in the network; and managing bandwidth of the transport connection tunnel among the quality of service levels and the applications. In an exemplary embodiment the invention also provides a hierarchical admission structure: one at a transport level for the label switched paths and one at a service level for user/application connections.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: September 21, 2004
    Assignee: Nortel Networks Limited
    Inventors: Sameh A. Kabie, Ramy M. Guirguis
  • Patent number: 6795439
    Abstract: A NMS for controlling the network provides a SoftPVC connection request comprising information associated with a specified relay node to a call-out node, when setting a path passing through the specified relay node. The call-out node prepares a SETUP message comprising information associated with the specified relay node, and transmits the message to nodes existing on the post stage. Thereafter, the SETUP message reaches the call-in node through the specified relay node, to thereby perform the signaling procedure, and as a result, a path from the call-out node to the call-in node passing through the specified relay node is set and established.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: September 21, 2004
    Assignee: Fujitsu Limited
    Inventors: Yoshihiro Watanabe, Taisuke Sasaki
  • Patent number: 6795423
    Abstract: A method is disclosed for receiving transmitted signals in the presence of CW interference in a communication system that determines the presence of a code in a received signal by comparing with a detector threshold calculations made in accordance with a sample of a received signal. Such systems include but are not limited to those incorporating a Sequential Probability Ratio Test. The method includes obtaining a first input power value of the received signal at a first sample time and obtaining a second input power value of the received signal at a second sample time. The first and second power values are compared in order to provide an input sample comparison and the forgoing steps are repeated in order to provide a plurality of input sample comparisons. The detector threshold is adjusted in accordance with the plurality of sample comparisons. The CW signal can be strongly correlated with a short code used for the acquisition purposes.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: September 21, 2004
    Assignee: InterDigital Technology Corporation
    Inventors: Nadir Sezgin, Stephen G. Dick
  • Patent number: 6791972
    Abstract: An apparatus for interfacing a PBX with an ATM network, comprises a circuit switch part for establishing an ATM communication channel to connect the ATM network if a subscriber requests access to the ATM network, and an ATM network switch part for converting the signaling information from the ATM communication channel into the corresponding ATM network cell that is applied to the ATM network.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: September 14, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jae-Won Hwang
  • Patent number: 6791954
    Abstract: In the method according to the present invention, a signal from a mobile station is received. The standard deviation of the symbol error rate is determined, and power control with adaptive adjustment of an amount of change in the target signal-to-noise ratio is performed based on the determined standard deviation of the signal error rate and a target associated therewith.
    Type: Grant
    Filed: June 12, 2000
    Date of Patent: September 14, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Terry Si-Fong Cheng, Ching Yao Huang, Frances Jiang, Alexandro Federico Salvarini
  • Patent number: 6791985
    Abstract: User traffic of one type must traverse many diverse networks, each operating by different paradigms and requiring different protocol stacks, before it reaches the destination. MPLS (Multiprotocol Label Switching) is being developed to solve some of the problems which involve the existence of different protocols along the traffic path. There is currently no accepted way of transporting ATM cells over an MPLS domain. New ways of packetizing ATM cells into labeled MPLS packets for transporting over an MPLS domain are described.
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: September 14, 2004
    Assignee: Nortel Networks Limited
    Inventors: Peter J. Ashwood-Smith, Bernard F. St-Denis
  • Patent number: 6788669
    Abstract: In a CDMA mobile communication system, upon occurrence of a call-connecting request, a mobile station sends a CDMA burst signal to a base station by random access. The base station detects de-spreading timing based on a correlation value between the CDMA burst signal and a reference code. Further, the base station delays the CDMA burst signal for a delay time equal to the time necessary for the detection of the timing. Upon detection of the de-spreading timing, the base station de-spreads the second-half portion of the CDMA burst signal from the midpoint to the end thereof, and at the same time, de-spreads the first-half portion of the delayed CDMA burst signal. By this, the demodulation time can be shorted as compared with that in the case of de-spreading the CDMA burst signal from its beginning to its end.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: September 7, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Michiaki Takano, Kazuaki Ishioka
  • Patent number: 6785275
    Abstract: A routing table for use with a router in a world-wide network, includes an existing routing table with a multicast-destination (MD) column.
    Type: Grant
    Filed: March 13, 2000
    Date of Patent: August 31, 2004
    Assignee: International Business Machines Corporation
    Inventors: Richard Harold Boivie, Kiyoshi Maruyama
  • Patent number: 6785258
    Abstract: A method is provided for minimizing the peak power level in a combination of orthogonal frequency division multiplexed (OFDM) tones. The method is particularly effective when the information to be communicated is digital data consisting of long patterns of “1”s or “0”s. The digital data of the message is combined with a scrambling vector before the data is modulated. The randomization of data patterns, in turn, leads to a more random combination of OFDM tone amplitude being transmitted. The message is recovered at the receiver by removing the scrambling vector. A table of scrambling vectors is maintained at the transmitters and receivers. The table pointer to select the scrambling vector is selected in response to the position of the message in the communication structure. An OFDM communication system using the above-described method is also provided.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: August 31, 2004
    Assignee: AT&T Wireless Services, Inc.
    Inventors: Salvador Garcia, Jr., Eamonn Gormley, Elliott Hoole
  • Patent number: 6785228
    Abstract: A communications network which enables service providers to optionally place limitations on the switched connection requests that subscribers may place through the network. This is accomplished by enabling node administrators to configure, on a per subscriber basis. throughput and other connection limits for all incoming and outgoing switched connections a subscriber may attempt to establish or receive. The limits are checked by an edge network node when the call is requested and the call is accordingly established or refused.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: August 31, 2004
    Assignee: Alcatel Canada Inc.
    Inventors: Henri R. Vandette, Steve Morin
  • Patent number: 6778496
    Abstract: A method and apparatus to control call admission to a packet-based network and achieve load balancing over a packet-based network includes at selected times generating and sending a path status message along a defined path, such as an MPLS path, through the network. As the message travels along the path, a cost metric field within the message is updated. The cost metric may reflect available bandwidth, or percentage utilization of the aggregate bandwidth, on the most congested (bottleneck) link in the path that it tracks. The cost metric is determined for each link at a data measuring point, such as individual routers, along the path. The optimum path between two gateways is determined, and further packet streams are routed onto the optimum path.
    Type: Grant
    Filed: June 7, 2000
    Date of Patent: August 17, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Gopalakrishnan Meempat, David J. Houck
  • Patent number: 6778524
    Abstract: A database is populated with geographic locations for network devices by providing a node on a network and making a connection into a network service provider (NSP) point of presence (POP) to obtain a connection to the network via the NSP. A message is then transmitted to the node over the network connection obtained from the NSP. The message is received at the node and a source network identifier is extracted from the message. The source network identifier is then associated with a known geographic location for the POP in a database. The foregoing steps are then repeated for multiple different POPs. Also, a database is populated with geographic locations for network devices by providing a node on a network and making a connection into a network service provider (NSP) point of presence (POP) to obtain a connection to the network via the NSP. A message is then transmitted to the node over the network connection obtained from the NSP.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: August 17, 2004
    Inventor: Steven Augart
  • Patent number: 6771660
    Abstract: The present invention is a novel method and apparatus for efficiently transporting and synchronizing data between the Media Access Control (MAC) and physical communication protocol layers in a wireless communication system. An inventive method and apparatus for transporting and synchronizing to fixed-length ATM cell boundaries and for protecting against the potential misinsertion of ATM cells has been described. An inventive ATM packet format is described. The ATM packet format is used by the present invention for the transportation and synchronization of ATM cells. The ATM packets include fields that are used to detect errors occurring within each ATM cell. ATM cells are transported in exactly two TC/PHY packets, or TDUs. ATM header information is contained in the first TDU only. No ATM header information is carried by the second TDU. An entire ATM cell is discarded if an uncorrectable error is detected in the first TDU. If no uncorrectable error occurs in the first TDU, the second TDU is checked for errors.
    Type: Grant
    Filed: October 25, 2000
    Date of Patent: August 3, 2004
    Assignee: Ensemble Communication, Inc.
    Inventors: Yair Bourlas, Jacques Behar, Kenneth L. Stanwood
  • Patent number: 6771600
    Abstract: A packet insertion interval control system includes a counting unit (32), having a first bit field for managing an insertion interval of a management packet required to be cyclically inserted and a second bit field for specifying a logic path for forwarding the management packet, for executing such a counting operation as to periodically cycle the first bit field and the second bit field, and a control unit (31) for executing control for specifying, when a count value indicated by the first bit field of the counting unit is a predetermined value, the logic path for forwarding the management packet on the basis of a count value indicated by the second bit field of the counting unit, and for inserting the management packet into the specified logic path. With this architecture, it is feasible to restrain an increase in quantity of the hardware and flexibly correspond to changes in the number of connections (number of channels) and the cell insertion interval (packet insertion interval) per communication system.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: August 3, 2004
    Assignee: Fujitsu Limited
    Inventors: Kenichi Kawarai, Takeshi Terada, Yasutaka Ohno, Yasuhiro Ooba
  • Patent number: 6771611
    Abstract: A network transmitter for generating frames of data for transmission is provided. The transmitter includes a frame generation circuit with a register storing a bit sequence corresponding to a network standard training bit sequence. A multiplexer includes a first input receiving bits from the register corresponding to the network standard training bit sequence and a second input receiving bits representing the data for transmission.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: August 3, 2004
    Assignee: Advanced Micro Devices, Inc.
    Inventor: Atul Garg
  • Patent number: RE38627
    Abstract: A high-capacity-spread-spectrum transmitter and receiver, for use over a communications channel. A demultiplexer demultiplexes message data into a plurality of demultiplexed-data signals. A transmitter-generic-chip-code generator generates a generic-chip-code signal and a plurality of transmitter-message-chip-code generators generate a plurality of message-chip-code signals which are “near-orthogonal” over a demultiplexed data bit. A plurality of EXCLUSIVE-OR gates, spread-spectrum processes the plurality of demultiplexed-data signals with the plurality of message-chip-code signals to generate a plurality of spread-spectrum signals. A combiner combines the generic-chip-code signal and the plurality of spread-spectrum-processed signals. A receiver-generic-chip-code generator generates a replica of the generic-chip-code signal. A generic mixer recovers the carrier signal from the spread-spectrum-communications signal.
    Type: Grant
    Filed: September 2, 1997
    Date of Patent: October 19, 2004
    Assignee: InterDigital Technology Corp.
    Inventor: Donald L. Schilling