Patents Examined by Doris H. To
  • Patent number: 7505467
    Abstract: A method and apparatus for dynamic bandwidth management for voice traffic in a digital communications network is disclosed. In one embodiment, a method for use in a digital communications network comprises checking a multiplexed connection's bandwidth capacity to carry a call over a link; and overflowing the call onto a non-multiplexed connection, when the multiplexing connection's bandwidth is insufficient to carry the call.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: March 17, 2009
    Assignee: Cisco Technology, Inc.
    Inventor: Bruce Buffam
  • Patent number: 7391761
    Abstract: A system and method is provided for routing telephone calls on a standard telephone network to one of a PSTN network and a VoIP network. The system comprises at least one telephone capable of making local and long distance calls on the network. A Central Office is coupled to the telephone and comprises a trigger for identifying calls to be routed to either a VoIP platform or the PSTN network. Calls to be converted to IP protocol are routed to a VoIP platform. An IP network is coupled to the VoIP platform and routes VoIP calls to one or more devices in communication with the telecommunications system.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: June 24, 2008
    Assignee: AT&T Delaware Intellectual Property, Inc.
    Inventors: John P. Ruckart, Rimas J. Rauba
  • Patent number: 7391716
    Abstract: A semiconductor integrated circuit which transmits voice data as ancillary data while maintaining transmission quality without increasing the number of transmission cables in a system for carrying out serial transmission of image data as main data. The semiconductor integrated circuit includes a main data transmitting circuit for converting main data into serial data and transmitting the serial data via at least one transmission path in synchronization with a clock signal, and an ancillary data transmitting circuit for pulse-width-modulating the clock signal by using ancillary data to generate a modulated clock signal having at least three kinds of pulse widths in a predetermined order and transmitting the modulated clock signal via another transmission path.
    Type: Grant
    Filed: May 28, 2002
    Date of Patent: June 24, 2008
    Assignee: Thine Electronics, Inc.
    Inventor: Seiichi Ozawa
  • Patent number: 7391779
    Abstract: A combined CDM/TDM (code division multiplexing/time division multiplexing) transmitter and method are provided which employ fractional slot assignment by assigning fractional CDM channel gains to multiple slots for at least one packet with a goal that a sum of fractional CDM gains assigned each packet over a scheduling period meet a required threshold. In some embodiments, the transmitter is adapted to determine which users to transmit during a given slot, and to determine fractional CDM channel gains using an optimization of fractional CDM channel gain and user assignment which maximizes a number of users each of which is assigned a respective group of one or more slots with fractional CDM channel gains which sum to the required threshold for the user.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: June 24, 2008
    Assignee: Nortel Networks Limited
    Inventors: Sung K. Park, Hong Ren, Ning Guo
  • Patent number: 7388845
    Abstract: Power control methods and apparatus for use in a sectorized cell of an OFDM communications system are described. Each sector of a cell uses the same frequencies and transmission times and is synchronized with the other sectors in the cell in terms of tone frequencies used at any given time and symbol transmission times. Tones are allocated to channels in each cell in the same manner so that each channel in a sector has a corresponding channel in another sector. Power differences between channels in different sectors are maintained to be within a pre-selected power difference. Different channels in a cell are assigned different power levels. Wireless terminals are assigned to channels based on channel feedback information. Wireless terminals with poor channel conditions are allocated to higher power channels than wireless terminals with good channel conditions. Lower power channels often include more tones per symbol time than high power channels.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: June 17, 2008
    Assignee: QUALCOMM Incorporated
    Inventors: Rajiv Laroia, Frank A. Lane, Junyi Li
  • Patent number: 7385924
    Abstract: Methods, apparatuses and systems directed to a flow-based, traffic-classification-aware data collection and reporting system that combine flow-based data collection technologies with enhanced traffic classification functionality to allow for analysis and reporting into aspects of network operations that prior art systems cannot provide. Embodiments provide enhanced views into the operation of computer network infrastructures to facilitate monitoring, administration, compliance and other tasks associated with networks. When a traffic flow terminates, a traffic monitoring device emits a flow data record (FDR) containing measurements variables and other attributes for an individual flow. A data collector gathers the flow data records and enters them into a database. A network management application can then query the database with selected commands to derive reports characterizing operation of the network suitable to diagnose problems or view conditions associated with the network.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: June 10, 2008
    Assignee: Packeteer, Inc.
    Inventor: Guy Riddle
  • Patent number: 7385931
    Abstract: A system includes a communication network having any number of separately addressable elements. An analysis device can test packet data paths between these elements by eliciting particular traffic patterns. For example, the analysis device may elicit similar traffic patterns in both forward and reverse communications with a remote element and analyze these communications to detect network misconfigurations.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: June 10, 2008
    Assignee: Fujitsu Limited
    Inventors: Antonio Magnaghi, Jingsha He, Takafumi Chujo
  • Patent number: 7385943
    Abstract: A method of allocating communication resources to terminals in an MF-TDMA telecommunication system is provided, in which digital data is transmitted in selected time intervals on each of a plurality of carriers. The resources for each terminal are allocated to frames grouped into superframes. The pattern of resources (time intervals and carriers) allocated to the terminal for the transmission of real-time data in each frame of a given rank in a superframe remains the same throughout the various superframes of the call relating to the real time data. Accordingly, the transmission of real time data is virtually free of jitter.
    Type: Grant
    Filed: May 10, 2002
    Date of Patent: June 10, 2008
    Assignee: Alcatel
    Inventor: David Niddam
  • Patent number: 7385976
    Abstract: A method selectively acknowledges data packets in a network including a multiple stations connected by a common wireless channel. A transmitting station requests a block acknowledgement from a receiving station. The transmitting station transmits a block of data packets to the receiving station. The receiving station determines a number of successfully received data packets and a number of incorrectly received packets. Then, the receiving station selectively acknowledges only the successfully received data packets if the number of usefully received data packets is less than the number of incorrectly received data packets, and otherwise acknowledging only the incorrectly received packets.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: June 10, 2008
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Daqing Gu, Zhifeng Tao, Jinyun Zhang
  • Patent number: 7382726
    Abstract: A dual ring communication method using a node system includes: with congestion occurring in a first node system, the first node system generating a congestion information packet and forwarding it to an upper node system positioned in a direction opposed to a direction of forwarding a data packet; a second node system determining whether it is the last node involved in the congestion; adding its congestion information to the congestion information packet and forwarding the congestion information packet to an upper node system when the second node system is not the last node; performing bandwidth allocation for the node systems in other case; and generating a bandwidth allocation packet and transmitting the bandwidth allocation packet to the node systems involved in the congestion.
    Type: Grant
    Filed: April 30, 2003
    Date of Patent: June 3, 2008
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sang-Woo Lee, Heyung-Sub Lee, Hyeong-Ho Lee
  • Patent number: 7379441
    Abstract: A system and method for mapping a combined frequency division duplexing (FDD) Time Division Multiplexing (TDM)/Time Division Multiple Access (TDMA) downlink subframe for use with half-duplex and full-duplex terminals in a communication system. Embodiments of the downlink subframe vary Forward Error Correction (FEC) types for a given modulation scheme as well as support the implementation of a smart antennae at a base station in the communication system. Embodiments of the system are also used in a TDD communication system to support the implementation of smart antennae. A scheduling algorithm allows TDM and TDMA portions of a downlink to efficiently co-exist in the same downlink subframe and simultaneously support full and half-duplex terminals. The algorithm further allows the TDM of multiple terminals in a TDMA burst to minimize the number of map entries in a downlink map.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: May 27, 2008
    Assignee: Wi-LAN, Inc.
    Inventors: Kenneth L. Stanwood, Israel Jay Klein, George Lin, An Chen
  • Patent number: 7376151
    Abstract: A method of transmitting timing critical data via an asynchronous channel without changing any datum to be transmitted. The timing critical data can be an MPEG transport stream. The asynchronous channel can be a computer or telephone network, a digital storage media such as a digital VCR, or a digital interface. The method involves tagging each transmission unit of the data stream, before inputting to the channel, with timing information, and using the timing information at the output end of the channel to recreate the proper data timing, Various schemes are described for packing the timing information tags with each or a plurality of transmission units.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: May 20, 2008
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Ronald W. J. J. Saeijs, Imran A. Shah, Takashi Sato
  • Patent number: 7376148
    Abstract: Some embodiments adaptively adjust to the current call load in a packet based virtual circuit to minimize the delay experienced by the first packets of any talk spurt for a particular active call. Some embodiments minimize the jitter introduced by multiplexing voice packets by smoothing out the waiting time experienced by each of the voice packets. Some embodiments effectively minimize jitter when the number of active calls on a virtual circuit drops off suddenly. Some embodiments are able to differentiate signaling packets indicating a telephony event from voice packets and give the signaling packets expedited processing with no delay contributed by the subcell multiplexing process. Other embodiments are described in the claims.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: May 20, 2008
    Assignee: Cisco Technology, Inc.
    Inventors: Jisu Bhattacharya, Sarang Wagholikar
  • Patent number: 7372863
    Abstract: Disclosed are systems and methods for monitoring and controlling operating modes in a network transceiver. In one embodiment, a computer system is associable with an Ethernet network, and comprises a processing unit, a memory and a transceiver. The transceiver comprises an encoder, a decoder and a controller. The controller controls operating modes of the transceiver, and, specifically, (i) negotiates a communications channel between the computer system and another computer system over the Ethernet network wherein the computer system enters one of a master state and a slave state, and (ii) repeatedly directs, in response to entering the master state or slave state, the encoder to encode data to be transmitted to the another computer in one of an industry-compliant mode and a custom mode until the encoded data is properly received by the other computer.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: May 13, 2008
    Assignee: National Semiconductor Corporation
    Inventors: Peter J. Sallaway, Douglas Easton, Matt Webb
  • Patent number: 7366191
    Abstract: A plurality of mesh-connecting ports interconnect a plurality of bridges including an own bridge and other bridges as a mesh network. A packet transmitter/receiver reciprocally transmits and receives packets between the plurality of bridges through the mesh-connecting ports. A shortest path constructing unit constructs the shortest path between the bridges through the packet transmitter/receiver. An STP processing unit executes STP processing for activating a spanning tree protocol (STP) to provide redundancy to the mesh network. A backup processing unit continuously leaves in the mesh domain a first mesh network bridge detected a line fault, and executes the backup processing to active a back up protocol for forming a backup route in such a manner that the packet reaches a second mesh network bridge that has become unreachable by the line fault, through a third mesh bridge connected with the second mesh network bridge.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: April 29, 2008
    Assignee: Anritsu Corporation
    Inventor: Mitsuru Higashiyama
  • Patent number: 7366151
    Abstract: A packet-based, hierarchical communication system, arranged in a spanning tree configuration, is described in which wired and wireless communication networks exhibiting substantially different characteristics are employed in an overall scheme to link portable or mobile computing devices. The network accommodates real time voice transmission both through dedicated, scheduled bandwidth and through a packet-based routing within the confines and constraints of a data network. Conversion and call processing circuitry is also disclosed which enables access devices and personal computers to adapt voice information between analog voice stream and digital voice packet formats as proves necessary. Routing pathways include wireless spanning tree networks, wide area networks, telephone switching networks, internet, etc., in a manner virtually transparent to the user.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: April 29, 2008
    Assignee: Broadcom Corporation
    Inventors: Joseph J. Kubler, Michael D. Morris
  • Patent number: 7362772
    Abstract: A novel network architecture that integrates the functions of an internet protocol (IP) router into a network processing unit (NPU) that resides in a host computer's chipset such that the host computer's resources are perceived as separate network appliances. The NPU appears logically separate from the host computer even though, in one embodiment, it is sharing the same chip.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: April 22, 2008
    Assignee: NVIDIA Corporation
    Inventors: Robert A. Alfieri, Gary D. Hicok, Paul J. Sidenblad, Mark A. Parris
  • Patent number: 7362777
    Abstract: A multiplexed frame based client signal comprising a payload and a client overhead is transported between first and second client networks over a plurality of signal paths by inverse multiplexing the client signal into a plurality of lower rate signals each containing a respective payload and client overhead; attaching a carrier overhead to each said lower rate signal; transmitting the lower rate signals over the plurality of paths from the first client network to the second client network; and, at the second network, discarding the carrier overhead from each lower rate signal, and reassembling the lower rate signals so as to recover the client signal. The method enables bandwidth trading utilising virtual concatenation of synchronous optical channels, such that transparent transmission of a customers signals over any variety of intermediate networks can be achieved without requiring that the intermediate networks support virtual concatenation.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: April 22, 2008
    Assignee: Nortel Networks Limited
    Inventors: Douglas Fisher, Nigel Bragg, Robert Friskney, Nigel Baker
  • Patent number: 7362773
    Abstract: A DOCSIS 2.0 compatible sniffer which can receive legacy DOCSIS 1.x TDMA bursts as well as DOCSIS 2.0 SCDMA bursts. One embodiment uses two cable modems in the sniffer, one to capture downstream data bursts and the other to capture downstream messages and to recover the downstream symbol clock and generate an upstream reference clock which is phase coherent with the recovered downstream symbol clock. The reference clock is used by a cable modem termination system to capture upstream SCDMA DOCSIS 2.0 bursts. DOCSIS 1.x TDMA bursts may also be captured. Other embodiments use a DOCSIS 2.0 compatible modem in the sniffer to lock onto a downstream, register as a cable modem in the system and capture downstream messages in order to derive the correct timing to generate control signals to control burst capture circuitry in the sniffer to capture DOCSIS 1.x and 2.0 upstream bursts.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: April 22, 2008
    Assignee: Terayon Communications Systems
    Inventors: Yehuda Azenko, Selim Shlomo Rakib
  • Patent number: 7359398
    Abstract: A system for wireless communication having a region for asynchronous information transmission and a region for information transmission. The system uses channel time allocation for storing data in a data transmission buffer and initially transmitting information via asynchronous communication. When an amount of data stored in the buffer exceeds a predetermined value, the system transmits information via channel time allocation communication. The predetermined value is obtained by dividing overall bandwidth of the asynchronous information region by a number of wireless communication stations forming a network. When no data is stored in the buffer during channel time allocation, an allocated channel time is released.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: April 15, 2008
    Assignee: Sony Corporation
    Inventor: Shigeru Sugaya