Patents Issued in January 6, 2004
  • Patent number: 6674701
    Abstract: By adding a predetermined offset value which is not less than 0 to, to the value of a readout power at a time when readout power control operations are temporarily suspended, i.e., at a time when an optical head initiates a seek operation, with an adder, this latter value being stored in a readout power value storage circuit, because an optical recording medium readout apparatus makes it possible to cause the value of the readout power at the time when readout power control operations resume, i.e., at the time of completion of the seek operation performed by the optical head, to avoid abnormal power domains in which change in amplitude ratio with respect to change in readout power is not monotonically decreasing, it is made possible to avoid abnormal conditions such as occurrence of lag in response during readout power control operations.
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: January 6, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tetsuya Okumura, Shigemi Maeda
  • Patent number: 6674702
    Abstract: A laser drive circuit includes a first current supply unit which supplies a first drive current to a first laser diode based on a drive waveform signal generated by a drive waveform generating unit, a second current supply unit which supplies a second drive current to a second laser diode based on the drive waveform signal generated by the drive waveform generating unit, and a switching unit which selectively supplies the drive waveform signal generated by the drive waveform generating unit to one of the first current supply unit and the second current supply unit. The drive waveform generating unit may be part of the laser drive circuit, or may be separate from the laser drive circuit, and may include a drive waveform information storage unit which stores a recording strategy according to a type of disk.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: January 6, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Akihiro Asada, Hideo Ohnuki, Masaaki Kurebayashi, Yasuhito Tanaka, Toshimitsu Kaku, Takashi Hoshino, Hidehiko Kando
  • Patent number: 6674703
    Abstract: A disk-shaped recording medium includes a transplant substrate, and an optical recording layer formed on the transparent substrate. A light source emits light. An optical head is operative for applying the light to the optical recording layer from the light source via the transparent substrate, for focusing the light on the optical recording layer, and for reproducing information from the optical recording layer. A position detecting device is operative for detecting at least one of a pit depth and a physical position of information which has a first given relation with a specified address and which is recorded on the recording medium, and for generating first positional information representing at least one of the pit depth and the physical position. A previously-recorded secret code is reproduced from the recording medium. The secret code represents second positional information. The secret code is decoded into the second positional information.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: January 6, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Mitsuaki Oshima
  • Patent number: 6674704
    Abstract: An apparatus for manufacturing a disc drive comprises an adjusting element, put in contact with a disc table engaged with a rotational shaft of a drive motor via an engaging portion, for varying an inclination of the disc table which is swingable with a point of support at the engaging portion, a non-contact displacement measuring unit for detecting, the inclination of the disc table varied by the adjusting element, control unit for receiving a detection signal from the non-contact displacement measuring unit and stopping rotation of the drive motor when the inclination of the disc table has decreased to a predetermined value or less, and an adhesive supply unit for fixing the disc table to the rotational shaft of the drive motor which has been stopped by the control unit.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: January 6, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Ichiro Yamamoto, Motoji Oono
  • Patent number: 6674705
    Abstract: A tuned circuit is used to detect wobble clock inversions. The tuned circuit reacts to a wobble inversion with a change in amplitude that may be detected by a threshold detector. A bandpass tuned circuit is used to detect wobble clock inversions. The output of the bandpass tuned circuit is input to a saturating high-gain amplifier such as a comparator. The output of the saturating high-gain amplifier reacts to wobble inversions with a half-cycle that has an increased duration as compared to half-cycles without wobble inversions.
    Type: Grant
    Filed: June 1, 2000
    Date of Patent: January 6, 2004
    Assignee: Hewlett-Packard Company, L.P.
    Inventor: D Mitchel Hanks
  • Patent number: 6674706
    Abstract: On an information recording medium (1), digital information is multi-level-recorded by changing a shape of an information pit in correspondence with the digital information by multiple steps.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: January 6, 2004
    Assignee: Pioneer Corporation
    Inventor: Ryuichiro Morioka
  • Patent number: 6674707
    Abstract: In a digital recorded data reproduction which applies PRML signal processing, it is an object to enhance a reproduction signal quality and a playability for an abnormal signal by an offset correction and a phase-interpolation-type digital phase-locked loop. A prescribed frequency band of a reproduction signal is emphasized by a waveform equalizing unit 2, and its output signal is sampled by an asynchronous clock at an analog/digital converter 3. After a sampling signal is subjected to the offset correction, PR equalization is performed by a transversal filter 6 and a tap weighting factor control unit 8 which applies LMS algorithm, and a signal of a regular sampling phase is reproduced from its output signal by a high-order interpolation filter 7 employing a digital phase-locked loop 11. The reproduced signal in a regular phase is demodulated by a maximum likelihood decoder 12, thereby to reproduce digital data recorded on a medium.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: January 6, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Youichi Ogura, Koichi Urita, Shinichiro Sato, Yoshimasa Oda
  • Patent number: 6674708
    Abstract: In an information recording medium including a plurality of sector fields and having various pieces of information recorded in the sector fields, the header field in each sector field includes a first field in which a continuously repeated pattern complying with the run length limitation in the predetermined range is recorded, a second field in which an address mark including a violation pattern different from a reproduced pattern obtained by reproducing the repeated pattern when a defective pit which cannot be recognized as a pit is included in pits representing the repeated pattern is recorded, the violation pattern exceeding the run length limitation in the predetermined range, and a third field in which address data is recorded.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: January 6, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koki Tanoue, Hideaki Osawa
  • Patent number: 6674709
    Abstract: To implement light quantity monitoring with high frequency responsivity and correction of astigmatic differences of a semiconductor laser with a simple configuration with fewer parts. Of the output from a semiconductor laser light source, a peripheral component is entered by a light reflection element into an anterior light monitoring photodetector formed in the vicinity of a semiconductor laser light source. Furthermore, the surface of the reflection sphere of the light reflection element is anamorphic, and thus condensed to an appropriate size on the photodetector without being focused, providing high frequency responsivity. Furthermore, the light reflection element is inclined at a predetermined angle to cancel out astigmatic differences of the optical semiconductor laser light source. In addition, the photodetector is placed so that reflected light is bent by an inclination of the light reflection element, reducing the amount of parallel displacement during adjustment of the light reflection element.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: January 6, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Junichi Asada, Seiji Nishiwaki, Yuichi Takahashi, Kenji Nagashima, Hiroaki Matsumiya, Youichi Saitoh, Kazuo Momoo
  • Patent number: 6674710
    Abstract: A liquid-crystal panel is placed in an optical path of an optical beam from a light source to a recording surface of a recording medium for compensating wavefront aberration of the optical beam by giving a phase difference to the optical beam. The liquid-crystal panel comprises a layer of a liquid crystal material having an index of birefringence, wherein the product of the index of birefringence and thickness of the layer of the liquid crystal material is 0.4 &mgr;m or more.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: January 6, 2004
    Assignee: Pioneer Electronic Corporation
    Inventor: Masayuki Iwasaki
  • Patent number: 6674711
    Abstract: A stocker for information recording media is capable of stocking the information recording media and is to be loaded in a changer or unloaded from it. The stocker comprises a trace record device for providing a trace of lodging or dislodging operation of at least one information recording medium when the above-mentioned operation is carried out in an off-line condition.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: January 6, 2004
    Assignee: Pioneer Corporation
    Inventor: Katsuhiro Shiba
  • Patent number: 6674712
    Abstract: A method for generating a quaternary complex quasi-orthogonal code in a CDMA communication system is disclosed. The method comprises generating an M-sequence and then generating specific sequences having a good full correlation property with the M-sequence; generating a column permutation function for converting the M-sequence to a Walsh code; generating candidate masks by column shifting the specific sequences with the column permutation function; generating quasi-orthogonal code representatives by operating the candidate masks and the Walsh codes having the same length as that of the candidate masks; and selecting a quasi-orthogonal code satisfying a partial correlation with the Walsh codes, out of the generated quasi-orthogonal code representatives, and selecting a mask related to generation of the selected quasi-orthogonal code.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: January 6, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyeong-Cheol Yang, Jae-Yoel Kim, Hee-Won Kang, Young-Ky Kim
  • Patent number: 6674713
    Abstract: A method and apparatus are provided for providing continuous voice and call communications between a data network and a telephony network. In one configuration, a first gateway controller that receives the communications from the data network is coupled multiple sessions to a gateway that couples the communications to the telephony network. When the in-use session fails, the communications are automatically switched over from this session to the another session, while maintaining the voice and call communications without interruption, and while ensuring that all messages generated by the gateway are sent to the gateway controller. In another configuration, first and second gateway controllers are designated as Active and Standby. Each of the gateway controllers maintains one or more sessions in communication with the gateway.
    Type: Grant
    Filed: February 23, 1999
    Date of Patent: January 6, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: Diane M. Berg, Thomas J. Bova, Theodore S. Krivoruchka, Jr., Kenneth A. Morneault
  • Patent number: 6674714
    Abstract: A transmission device which cross connects channels on a synchronous multiplex transmission network which forms a ring, and which performs restoration of communication by looping back signals in a protection path when a failure occurs includes a memory area which stores information for determining whether an alarm indication signal needs to be inserted in a channel or not, wherein the size of the memory area corresponds to the number of channels targeted for the restoration, and a part which inserts said alarm indication signal in a channel by switching results of the determination according to predetermined information. Further, the transmission device may switch and recover a path without skipping an event which arises between polling accesses by a CPU of said transmission device. Furthermore, the transmission device may include a part, provided in each interface part, which performs phase adjusting of channel signals.
    Type: Grant
    Filed: August 5, 1999
    Date of Patent: January 6, 2004
    Assignee: Fujitsu Limited
    Inventors: Hideaki Mochizuki, Ritsuko Isonuma
  • Patent number: 6674715
    Abstract: An ATM switching system comprises a redundant communication; system consisting of act-system and standby-system communication channels. Cells are sent through both the communication channels. A switch element is provided for performing system switching from the act-system communication channel to the standby-system communication channel in response to a request-to-switch. The switch element is connected with a line concentrator. The ATM switching system further comprises reading and controlling elements functionally realized installed software, for example. The reading element reads, when receiving the request-to switch, a number of the cell passing the line concentrator channel by channel. And the controlling element controls a switching operation of the switch element based on the read numbers.
    Type: Grant
    Filed: August 14, 1998
    Date of Patent: January 6, 2004
    Assignee: Fujitsu Limited
    Inventor: Kiyoshi Yamada
  • Patent number: 6674716
    Abstract: A method for deciding over the compliance of cells at an input of a switch. The time is counted with a time-counting device with a predetermined maximum counting range for determining the points in time of the arrival of the cells. The reading of the time-counting device is used to determine for a first arriving cell a first arrival time and for a second arriving cell a second arrival time. The second arrival time is compared with a theoretical arrival time for the second cell. The theoretical arrival time is calculated using the first arrival time and a predetermined value of an interarrival period. The number of wraps of the time-counting device is counted. The reading of a wrap-counting device at the second arrival time and at the theoretical arrival time is used to determine whether to use the comparison for deciding whether to consider the second arriving cell compliant or non-compliant or whether to consider the second arriving cell compliant or non-compliant without performing the comparison.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: January 6, 2004
    Assignee: International Business Machines Corporation
    Inventor: Ronald P. Luijten
  • Patent number: 6674717
    Abstract: End-to-end packet losses of one or more traffic streams transmitted across a congested network may be reduced by modulating the bandwidths of the corresponding traffic streams applied to node(s) of the network from one or more control points along the network topology. This reduction in packet loss results in a reduction in fluctuations or variability of the controlled traffic streams, an increase in bandwidth utilization and a reduction in times to transmit files. The control points can be either upstream or downstream of one or more congestion points along the network. The modulation of the bandwidths are governed by a nonlinear differential equation that involves feedback of the throughput and buffer occupancy level. The control terms involve a relaxation time, coupling constant, control constant and nonlinear feedback constants.
    Type: Grant
    Filed: March 30, 2000
    Date of Patent: January 6, 2004
    Assignee: Network Physics, Inc.
    Inventors: Minh Duong-van, Tomas J. Pavel, Han C. Wen
  • Patent number: 6674718
    Abstract: A method and system for controlling pipes in a computer network is disclosed. The network includes processor(s) having a switch and a queue used for transmitting traffic through the switch. Minimum and maximum flows are set for each pipe. The queue level, any excess bandwidth and offered rate of packets are determined for the queue. A global transmit fraction is controlled using the queue level and offered rate so that the global transmit fraction and queue level are critically damped if the queue level is between certain levels. A transmit fraction for a flow is set to the minimum of the global and differential transmit fractions. The differential transmit fraction linearly increases the flow based on the minimum or maximum flow if excess bandwidth exists and the flow is less than the maximum and exponentially decreases the flow based on the minimum or maximum flow if excess bandwidth does not exist and the flow exceeds the minimum.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: January 6, 2004
    Assignee: International Business Machines Corporation
    Inventors: Marco C. Heddes, Clark Debs Jeffries
  • Patent number: 6674719
    Abstract: The Quotient algorithm is used for controlling the monitoring of disturbances in a physical process and disturbance-counting values acquired in the monitoring are utilized to determine a disturbance frequency and a peakedness value for the disturbance process. The peakedness value is used as a measure of the bursty behavior of the disturbances. The disturbance frequency and the peakedness value determined from the acquired disturbance-counting values are utilized in calculating more refined thresholds for the algorithm, and the thresholds initially set for the Quotient algorithm are replaced by these more refined thresholds, thus improving the performance and quality of the disturbance monitoring.
    Type: Grant
    Filed: March 18, 1999
    Date of Patent: January 6, 2004
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: David LeCorney
  • Patent number: 6674720
    Abstract: In a multiprocessor system having a plurality of nodes connected to a network, wherein communication between the plurality of nodes is in the form of packets, a system and method of aging packets. A packet having an age value is built and transmitted through the network. The age value is increased at predetermined intervals, wherein increasing includes determining a current age of the packet and changing the interval as a function of the current age. A method of avoiding livelock and a method of preaging response packets is also described.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: January 6, 2004
    Assignee: Silicon Graphics, Inc.
    Inventors: Randal S. Passint, Gregory M. Thorson, Timothy Stremcha
  • Patent number: 6674721
    Abstract: Methods and apparatus are disclosed for determining the order to send information arriving at the inputs of a packet switching system. A line card maintains its own data structure indicating flow control information and a queue for each destination it is sending data with its memory. Control logic then controls the placing of the incoming data into these queues and for taking the data out of the queues and sending the data, typically in the form of packets, to the packet switch. As information arrives at a line card, priority outgoing packet time slots are allocated for that destination. In this manner, each destination is given the opportunity to send information at its arrival rate. In the remaining bandwidth or packet cycles available on the outgoing link, the destination queues containing information retained due to a congestion condition are serviced.
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: January 6, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: Zubin D. Dittia, Jonathan S. Turner
  • Patent number: 6674722
    Abstract: The invention relates to a method for controlling the flow of data messages exchanged between asynchronous digital stack processes in an unreliable distributed multiprocessor system, such as an SDH (Synchronous Digital Hierarchy) node. In accordance with the invention, the inter-process flow control algorithm is based on a credit mechanism. According to that mechanism, a sending process (P1) must receive credit from the receiving process (P2, P3, P4) before the sending process (P1) can send messages (Q) to the recipient. The sending process (P1) uses in the account (account P2, account P3, account P4) of each receiving process the process's own pool (V2, V3, V4) and, in addition, a common pool (Y1) for all the receiving processes, so that a pool at each given moment represents the unused amount of credit obtained from the receiving processes (P2, P3, P4) and so that the free portion in the pool indicates how much there is room left in the message buffer for messages (Q) sent to the receiving process.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: January 6, 2004
    Assignee: Nokia Corporation
    Inventors: Risto Tiainen, Jari Rautiainen, Pekka Tonteri
  • Patent number: 6674723
    Abstract: Disclosed is an apparatus and method of monitoring the queue state of a switch in the subscriber board of an asynchronous transfer mode switching system. A difference value between the present time value and a previous input time value stored in a memory per connection is inputted to a forward resource management (FRM) cell when a resource management (RM) cell is inputted from a source, and a switch load measurement value written in the FRM cell is obtained by calculating the difference value between the present time value and a previous output time value stored in the memory per connection when the FRM cell transmitted from the source passes through the switch. The obtained switch load measurement value is inputted to a backward resource management (BRM) cell transmitted from a destination to be transmitted to the switch.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: January 6, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sang-Wan Joo, Nae-Ho Chung
  • Patent number: 6674724
    Abstract: An integrated web-based system for performing telecommunications system testing includes an application server that includes a plurality of test applications. The application server provides a graphical user interface to a plurality of workstation clients. Users can launch tests and monitor test results at the workstation clients. The test are performed by a plurality of telecommunications system test devices. The test devices include such devices as protocol analyzers, bit error rate testers, sniffers, and the like. A test access server provides an interface or bridge between the application server and each of the test devices. The test access server routes and provides appropriate translation of messages and commands between the test devices and the application process server.
    Type: Grant
    Filed: February 17, 1999
    Date of Patent: January 6, 2004
    Assignee: WorldCom, Inc.
    Inventors: Brian A. Main, Michael U. Bencheck, Dale W. Harris, Jr.
  • Patent number: 6674725
    Abstract: A system and method for providing integrated control of communication services, which includes an Integrated Services Controller (ISC), which is configured to establish communications with any numbers of communications networks, such as The Public Switched Telephone Network or the Internet. Communications may be established with one or more communications services, which in turn provide classification criteria which includes variable parameters that define a capability of a particular communications service. Also received may be a Message Registration List (MRL), which registers with the ISC messages in which a particular communications service has a notification interest. Through these communications, the ISC may be configured to provide a centralized processing for messages received from various system entities so as to apply intelligent prioritization rules for each message processed.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: January 6, 2004
    Assignee: Qwest Communications International, Inc.
    Inventors: Jafar S. Nabkel, Paul D. Jaramillo, Ronald J. Egan, Steven E. Norby
  • Patent number: 6674726
    Abstract: A processing rate monitoring apparatus includes an appearance interval counter for counting a packet interval in a monitored connection at a real number level, and a determining arrangement, operable each time a packet corresponding to a monitored connection is detected, to compare a count value on the appearance interval counter indicating a time elapsed from the previous detection to the detection of the packet with an allowed value for an appearance interval calculated from a transmission rate of the monitored connection to determine the presence or absence of a transmission rate violation in a current monitoring cycle.
    Type: Grant
    Filed: February 24, 1999
    Date of Patent: January 6, 2004
    Assignee: Oki Electric Industry Co, Ltd.
    Inventors: Youiti Kado, Ryohei Konuma, Makiko Kaji
  • Patent number: 6674727
    Abstract: A Distributed Ring Protocol (DRiP) arrangement includes a database and protocol for maintaining and distributing information within a distributed token ring (TR) bridge having a logical switch fabric that is distributed over a TR switching network of switches interconnected by trunk links, such as Inters witch Link (ISL) trunks. The DRiP information is used by switches within the ISL switched fabric to determine the status (configured and/or activated) and association (within a switch) of ports of the distributed bridge.
    Type: Grant
    Filed: March 10, 1999
    Date of Patent: January 6, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: David A. Carroll, John K. Fitzgerald, Kara J. Adams, Kenneth H. Potter, Jr., Gary William Kramling
  • Patent number: 6674728
    Abstract: The invention relates to a method for utilizing the available bandwidth in a wireless communication system that comprises a first (ANB) and a second (C/D) communication device intended to transmit information to each other, where each device (A/B; C/D) simultaneously can transmit on a first frequency and receive on a second frequency. Based on the need of the respective devices to transmit information within a particular interval of time, the said interval of time is divided up into a number of sub-intervals, the first device simultaneously transmitting on both the first and the second frequencies within a number of the said sub-intervals, and the second device simultaneously receiving on both the first and the second frequencies during these sub-intervals. The invention also relates to devices and modules intended to be incorporated in such a system.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: January 6, 2004
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Erik Carlsson, Göran Snygg
  • Patent number: 6674729
    Abstract: A method and system provides connections to an ATM system and includes selective echo cancellation. The invention includes two interworking units, an echo canceller, and a signaling processor. The signaling processor receives and processes signaling to provide connection control instructions to the interworking units. The first interworking unit will accept a connection, and if the connection does not require echo cancellation, interwork the incoming connection with an ATM connection to the ATM system. If the incoming connection requires echo cancellation, the first interworking unit will interwork the incoming connection with an ATM connection to the second interworking unit. The second interworking unit will interwork the ATM connection with another connection to echo cancellation. After echo cancellation, the second interworking unit will interwork the connection from echo cancellation with another ATM connection to the ATM system.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: January 6, 2004
    Assignee: Sprint Communications Company, L.P.
    Inventor: Albert Daniel DuRee
  • Patent number: 6674730
    Abstract: Time alignment of a signal from a remote unit at a hub station of a multiple access system is achieved based upon an initial time indication received from the hub station at the remote unit via a satellite. The remote unit transmits a signal to the satellite, monitors for a retransmission of the signal from the satellite and measures the time difference between the outgoing and incoming signals. The remote unit, then, uses the time difference to more finely adjust the time alignment. Alternatively, the remote unit transmits a first signal advanced with respect to an on-time estimate to the hub station and receives a responsive energy indication from the hub station. The remote unit transmits a second signal delayed with respect to the on-time estimate to the hub station and receives a responsive energy indication from the hub station. The remote unit compares the two energy indications and adjusts the on-time estimate.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: January 6, 2004
    Assignee: Tachyon, Inc.
    Inventor: Karl E. Moerder
  • Patent number: 6674731
    Abstract: Transmission of TCP/IP data over a satellite link from a hub station to a plurality of remote units. The data, transmitted over the satellite link, uses the digital video broadcast (DVB) protocol. A field in the DVB header is used to indicate the location of the start of a new TCP/IP data packet within the DVB data. Use of a field in the DVB header to indicate the location of the start of a new TCP/IP data packet supports variable location of TCP/IP data within a DVB frame, and therefore more efficient use of the DVB bandwidth.
    Type: Grant
    Filed: October 20, 1999
    Date of Patent: January 6, 2004
    Assignee: Tachyon, Inc.
    Inventors: Steven H. Bradshaw, Bruce L. Carneal, Karl E. Moerder, Michael J. Theiss-Aird
  • Patent number: 6674732
    Abstract: A time slot which is formed by time-division multiplexing is divided into a plurality of blocks in at least a frequency direction, and also within each one of said plurality of blocks a plurality of subcarriers are formed. A predetermined number of plurality of blocks forms one communication channel, whereby a plurality of communications are formed within a time slot. With this, one time slot can be multiplexed by communication of multiple carriers separated in frequency. In this manner, with simple constitution, communication can be performed satisfactorily even in an environment where a multiple path is present.
    Type: Grant
    Filed: January 24, 2000
    Date of Patent: January 6, 2004
    Assignees: Sony Corporation, Sony International (Europe) G.m.b.H.
    Inventors: Ralf Boehnke, Kentaro Odaka, Hamid Amir-Alikhani, Richard Stirling-Gallacher, Seiichi Izumi, Mitsuhiro Suzuki
  • Patent number: 6674733
    Abstract: The invention relates to a method and an arrangement for supporting TCP/IP services in a cellular radio access network connected to a telecommunications network offering TCP/IP services. In accordance with the invention, the bearer service parameters required by different TCP/IP services are predetermined in the radio access network, the correct parameters for a given connection being selected by identifying the TCP/IP service on the basis of the content of the first IP packet received. Thus, different TCP/IP services can be handled in different ways in the radio access network and a bearer service that best corresponds to the actual needs can be established through the radio access network. This way, good service quality to the user is ensured and, furthermore, optimization of the capacity of the radio access network is made possible when only correct-type capacity is reserved for each connection.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: January 6, 2004
    Assignee: Nokia Corporation
    Inventor: Sami Huusko
  • Patent number: 6674734
    Abstract: A method, computer program, and apparatus for allowing endpoints to move between zones of a packet-switched network. In the invention, a communication between local and remote endpoints are established via a first gatekeeper, which services a first zone of the packet-switched network, when the local endpoint is at a location serviced by the first zone of the packet-switched network. When the local endpoint moves to a location serviced by a second zone of the packet-switched network, subsequent to the initial hand-off, communication between the local and remote endpoints is maintained via the first gatekeeper and a second gatekeeper which services the second zone of the packet-switched network, by performing an initial hand-off communication control functions from the first gatekeeper to the second gatekeeper.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: January 6, 2004
    Assignee: Nokia Corporation
    Inventors: Liangchi Hsu, Khiem Le, Stefano Faccin, Rene Purnadi, Rajeev Koodli
  • Patent number: 6674735
    Abstract: A radio handset and method of operation of same for communication on a selected channel of a radio telephone system in which information is transmitted in bursts, each burst having respective portions independently capable of indicating burst errors. The handset is operable to detect sliding collisions by comparing the distribution of errors over error indicating portions of a received burst.
    Type: Grant
    Filed: December 1, 1999
    Date of Patent: January 6, 2004
    Assignee: Nokia Mobile Phones Limited
    Inventors: Robert Stanley Saunders, Nguyen Quan Tat
  • Patent number: 6674736
    Abstract: A method and apparatus which permits handoffs while the mobile station is in the system access state. This is achieved by providing for channel assignment messages to be sent over the paging channel of a plurality of base stations, which increases the probability of one of the messages getting through. In addition, this assures the mobile station will be able handoff to a different base station and have a traffic channel allocated to it on the new base station without delay. In addition, a method and apparatus which permits the mobile station to be directly assigned into a soft handoff state upon traffic channel assignment.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: January 6, 2004
    Assignee: Qualcomm Incorporated
    Inventor: Edward G. Tiedemann, Jr.
  • Patent number: 6674737
    Abstract: A wireless local area network (LAN) comprises a primary station (PS) having a radio transceiver unit and a plurality of secondary stations (SS). Each secondary radio station having its own transceiver unit. The primary station operates in accordance with a time division protocol having a plurality of concatenated frames. A predetermined number of the concatenated frames comprise a superframe which further includes a time slot (HiRBS). In response to the transmission of a system wide clock cycle synchronization signal the primary station initiates the transmission of a superframe and a secondary station (HN) out of range from the primary station and wishing to join the LAN but unable to communicate directly with the primary station transmits a signal burst in the time slot for reception by a secondary station (FN) which is in range of the primary station, the secondary station (FN).
    Type: Grant
    Filed: January 11, 2000
    Date of Patent: January 6, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Matthew P. J. Baker
  • Patent number: 6674738
    Abstract: A method and apparatus for detecting and diagnosing wireless network failures, provides for capturing, analyzing, and displaying detailed information relative to data packets and/or frames transmitted across a wireless network including an IEEE 802.11 LAN.
    Type: Grant
    Filed: September 17, 2001
    Date of Patent: January 6, 2004
    Assignee: Networks Associates Technology, Inc.
    Inventors: Kazim Orhan Yildiz, Bing Chen
  • Patent number: 6674739
    Abstract: There are provided a common channel message communicating device and method in a CDMA communication system. In a base station of the common channel message communicating device, a control message generator generates a control message including information representative of a spreading code for spreading a reverse common channel message, and a forward common channel transmitter transmits the control message on a forward common channel. In a mobile station, a control message analyser analyses information representative of an assigned spreading code included in the control message received on the forward common channel, a spreading code generator generates a spreading code based on the spreading code information, and a channel transmitter spreads the reverse common channel message by the spreading code and transmits the spread reverse common channel message.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: January 6, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyun-Seok Lee, Hi-Chan Moon, Soon-Young Y oon, Young-Ky Kim, Jin-Soo Park, Jae-Min Ahn
  • Patent number: 6674740
    Abstract: A CDMA radiocommunication signals receiver for receiving signals obtained from spectrum symbols spread using pseudo-random sequences and having been propagated along a number of paths. The receiver includes a filter configured to restore L unspread signals for each symbol, corresponding to L different paths, a calculating circuit configured to calculate L estimates of the L different paths, and a demodulator configured to process each of the L unspread signals using the corresponding L estimates to obtain L path contributions. Also included is an adder configured to form a sum of the L path contributions and for outputting an estimate of a received symbol, and a decision circuit configured to make a decision about a value of the received symbol based on a value of the estimate of the received symbol output by the adder.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: January 6, 2004
    Assignee: France Telecom
    Inventor: Mohamed Siala
  • Patent number: 6674741
    Abstract: The invention relates to high speed data transmission in digital mobile communication systems. In multichannel data transmission, a single data connection is allocated a plurality of parallel traffic channels (Ch1, Ch2, Ch3) via which the data units (1, 2, . . . , n) are transferred. At the transmitter (Tx), the data units are provided with a numbering by means of which the receiver (Rx) is able to restore the transmission sequence of the data units received via the different traffic channels. If the length of the data units varies to a great extent or is small in relation to the transmission delay tolerance of the traffic channels, the number space of the data units must be large for the receiver to be able to restore the data unit sequence. An increase in the number of numbering bits signifies a lower efficiency for the transfer. In at least embodiment of the invention, short data units are concatenated in data blocks (I and II) each of which is transmitted as an entity via the traffic channel.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: January 6, 2004
    Assignee: Nokia Telecommunications Oy
    Inventor: Juha Räsänen
  • Patent number: 6674742
    Abstract: A technique automatically configures the role of a router interface coupled to a synchronous data link control (SDLC) device, such as a physical unit (PU) station, of a computer network. When the router is activated and attached to a PU station over a communication link, it waits a predetermined period time before issuing any frames. A PU 2.1 or PU 4.0 station promptly initiates an exchange identification (XID) frame exchange upon being activated to determine its primary/secondary role according to the SDLC protocol. If no XID frames are received during the predetermined period, the router issues a null XID to the PU station, thereby forcing the PU station to respond with a configured XID identifying the station. If the PU station returns an XID0 frame, the router automatically configures the role of its interface to primary because a PU 2.0 device can only assume the role of a secondary.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: January 6, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: Rickie L. McDonald, Tsowen Chiang
  • Patent number: 6674743
    Abstract: A packet-forwarding device for providing policy-based services has at least a first interface, a second interface, and a packet forwarder for forwarding external packets between the first and second interfaces. The packet-forwarding device also runs internal applications that may be remotely accessed. The first and second interfaces transmit and receive internal and external packets, the internal packets being those packets generated or received by the internal applications during remote access, and the external packets being those packets destined for devices other than the packet-forwarding device. The packet forwarder forwards external packets between the first and second interfaces. An internal interface forwards internal packets between the internal applications and the first and second interfaces, and a policy engine logically connected to the internal interface applies a policy to the internal packets.
    Type: Grant
    Filed: December 30, 1999
    Date of Patent: January 6, 2004
    Assignee: 3Com Corporation
    Inventors: Satish Amara, Michael Freed
  • Patent number: 6674744
    Abstract: The specification relates to a device and method utilized for packaging voice data (and other delay critical ‘connection’ or ‘flow’ type application data) for point-to-point transport from one Packet Circuit Gateway (PCG) to a second PCG over Label Switching Routers (LSRs) within an Internet Protocol (IP) network; the beneficial aspects of the packaging format being: (i) a reduced overhead requirement when compared to conventional IP telephony due to inclusion of a switching label in lieu of an appended IP header, thereby increasing network bandwidth efficiency, and (ii) the increased transport speed associated with layer two label switching when compared to layer three forwarding.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: January 6, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Bharat Tarachand Doshi, Enrique Hernandez-Valencia, Kotikalapudi Sriram, Yung-Terng Wang, On-Ching Yue
  • Patent number: 6674745
    Abstract: A system for automatically populating an IP telephony address mapper with mapping information for an IP telephony gateway or other device. A self-registering gateway is configured to automatically provide an address mapper with mapping indicia defining the IP address of the gateway and the telephone numbers served by the gateway. In one embodiment, for instance, the gateway places a PSTN modem-to-modem call to the address mapper and conveys its IP address as a modulated data stream, while the address mapper may determine the telephone number of the gateway through established automatic calling number delivery procedures. Based on the telephone number of the gateway, the address mapper may then refer to a telephone number mapping database to identify other telephone numbers that could be served by the gateway. The address mapper may then update its address mapping data files accordingly.
    Type: Grant
    Filed: December 31, 1998
    Date of Patent: January 6, 2004
    Assignee: 3Com Corporation
    Inventors: Guido M. Schuster, Ikhlaq S. Sidhu, Jerry Mahler, Jacek A. Grabiec
  • Patent number: 6674746
    Abstract: A method and apparatus in a communications system for routing a call. A request is received from a user, at a first terminal, during a call to switch the call from a packet based network to a circuit switched network. Responsive to receiving the request, the call is switched to a second terminal associated with the user, wherein the second terminal uses the circuit switched network and wherein the call is switched to the second terminal without terminating the call.
    Type: Grant
    Filed: July 22, 1999
    Date of Patent: January 6, 2004
    Assignee: Nortel Networks Limited
    Inventor: John X. Lamarque, III
  • Patent number: 6674747
    Abstract: A subscriber card includes a controller for concentrating Internet frames so as not to occupy a telephone circuit for each call to an Internet service provider. The subscriber card is connected to a switching matrix that facilitates transmission of the concentrated Internet frames to a data transmission network. The subscriber card handles multiple subscriber inputs and statistically multiplexes data from the multiple subscriber inputs in order to increase throughput.
    Type: Grant
    Filed: August 30, 1999
    Date of Patent: January 6, 2004
    Assignee: Alcatel
    Inventors: Jean Lassaux, Michel Levy
  • Patent number: 6674748
    Abstract: The present invention provides a method of transitioning messages from a Signaling System 7 Network to a data network at a Signaling System 7 Gateway. The method is accomplished by receiving one or more Signaling System 7 messages at the Signaling System 7 Gateway, determining states of accessability of one or more extended capability codes listed within the Signaling System 7 gateway, where each extended capability code corresponds to one or more signaling end points within the data network, terminating the Signaling System 7 messages at the Signaling System 7 Gateway, determining the accessability of the signaling end points associated with the Signaling System 7 messages, and routing the Signaling System 7 messages based upon the accessability of the signaling end points.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: January 6, 2004
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: David Brad Dykhuizen, Jacqueline Ann Dykhuizen
  • Patent number: 6674749
    Abstract: A bandwidth transfer switching system (100) connecting various customer devices (12a-g), including local area networks (44), from customer premises (42) through a local loop (50) to a telco central office (50), to deliver switched circuit traffic to central office switches (60) and data packet traffic to wide area networks (64), such as the Internet. Access concentrators (104, 140) are employed at the customer premises (42), remote concentrators (106, 140) and optional relay nodes (160, 140) are employed in the local loop (50), and transfer switches (108, 140) are employed in the central office (56). Copper wire lines (166) and fiber optic lines (168) are used to handle typical protocols such as POTS, E1/T1/xDSL, and SONET between the various transfer nodes (140).
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: January 6, 2004
    Inventor: George Mattathil
  • Patent number: 6674750
    Abstract: A method and apparatus for communicating both packet data and time division multiplexed (TDM) transmissions over a shared bus. An apparatus is providing having a shared data communication bus and first and second control signals. The first control signal indicates the transmission of time division multiplexed data on the shared data communication bus, while the second control signal indicates the transmission of packet data on the shared data communication bus. A plurality of packet modules are provided, wherein each packet module is responsive to the state of the first and second control signals, and each packet module is further configured to transmit and receive data across the shared data communication bus. A plurality of synchronous interfacemodules are further provided, wherein each synchronous interface module is configured to transmit and receive data across the shared data communication bus.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: January 6, 2004
    Assignee: Paradyne Corporation
    Inventor: Robert Castellano