Adjusting For Phase Or Jitter Patents (Class 370/516)
  • Patent number: 8880039
    Abstract: The invention presently proposed relates to a method and an apparatus for intelligently composing a multimedia message for a mobile radio system. In this method, a digital voice message is received from a digital answering service, a blank multimedia message is generated and the received multimedia message is added, the available amount of data remaining in the multimedia message is calculated, the digital voice message is analyzed, and a suitable multimedia content is selected in dependence on the remaining available amount of data in the multimedia message and the analysis result, and finally the multimedia content thus selected is added to the multimedia message including the received digital voice message.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: November 4, 2014
    Assignee: Speech Design Gesellschaft fur Elektronische Sprachverarbeitung mbH
    Inventors: Robert Martens, Jan Martens
  • Patent number: 8873589
    Abstract: This invention relates to methods and devices for clock synchronization. The invention makes particular use of IEEE 1588 with offset and skew correction. In embodiments of the invention, the IEEE 1588 Precision Time Protocol is used to exchange time stamps between a time server and a client from which the client can estimate the clock offset and skew. In embodiments of the invention a free running clock at the client is provided with an estimation technique based on the time stamps from the IEEE 1588 PTP message exchange between the server and client clocks. The offset and skew from the estimation process can be combined with the local free running clock to give a synchronized local clock which is an accurate image of the master clock.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: October 28, 2014
    Assignees: Khalifa University of Science, Technology and Research, British Telecommunications plc, Emirates Telecommunications Corporation
    Inventors: James Aweya, Nayef AlSindi
  • Patent number: 8873590
    Abstract: A jitter correction method of a transmitting device, a jitter correction method of a receiving device, a transmitting device, and a receiving device are provided. The jitter correction method of the transmitting device includes: determining a time stamp of a video frame; determining a transfer time of an real-time transport protocol (RTP) packet that includes at least a part of the video frame as a payload; generating the RTP packet including the time stamp and the transfer time; and transmitting the RTP packet to a receiving device.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: October 28, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-kee Kim, Tae-sung Park, Gil-yoon Kim, Dae-hyung Kwon, Do-young Joung, Chun-bae Park, Ji-wan Song
  • Patent number: 8867482
    Abstract: A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: October 21, 2014
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 8867520
    Abstract: A method and an apparatus for augmenting timing synchronization in a base station using backhaul network frequency synchronization are provided. When in a first mode an external time epoch reference synchronized with system time is used to synchronize the base station to system time. When in a second mode a network frequency reference recovered from a backhaul network link is used to maintain the timing synchronization.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: October 21, 2014
    Inventors: Charles Nicholls, David Steer, Bradley John Morris
  • Patent number: 8854964
    Abstract: Method and apparatus for determining a transport bit rate for a multiprogram transport stream (MPTS) is described. In one example, a plurality of transport bit rates is computed for a respective plurality of programs in the MPTS. A highest transport bit rate and a lowest transport bit rate are selected from the plurality of transport bit rates. An average transport bit rate is computed from the highest transport bit rate and the lowest transport bit rate. The average transport bit rate is provided as an initial transport bit rate for the MPTS. Jitter in the MPTS may be compensated using the initial transport bit rate.
    Type: Grant
    Filed: December 14, 2007
    Date of Patent: October 7, 2014
    Assignee: General Instrument Corporation
    Inventor: Vincent C. Liu
  • Patent number: 8855108
    Abstract: Methods and apparatus that may be used to provide timestamps to physical layer devices are provided. One method includes obtaining a time value from a clock associated with a physical layer device that is communicatively coupled to a primary data packet switch. The method further includes adding a processing time to the time value to generate a timestamp and transmitting the timestamp to a multiplexer circuit. The method further includes writing the timestamp in parallel from the multiplexer circuit to a plurality of external physical layer devices that are communicatively coupled to a secondary data packet switch and are located external to a housing of the secondary data packet switch.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: October 7, 2014
    Assignee: Garrettcom, Inc.
    Inventors: Lee Harrell House, Ming-Hsin Kuo, Dileep Sivasankaran, Frank S. Madren
  • Patent number: 8848525
    Abstract: Methods, systems, and computer readable media for providing adaptive jitter buffer management based on packet statistics for media gateway are disclosed. According to one aspect, the subject matter described herein includes a system for providing adaptive jitter buffer management based on packet statistics for a media gateway. The system includes a media gateway for communicating data between entities in one or more telecommunication networks. The media gateway includes first and second network interfaces for interfacing with the one or more telecommunication networks, a packet monitor for monitoring and maintaining packet statistics for channels established between the first and second network interfaces, each channel including a jitter buffer for buffering packets received on the first or second network interface, and a jitter buffer adjustment module for dynamically adjusting jitter buffer size on a per-channel basis based on the packet statistics maintained for each channel.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: September 30, 2014
    Assignee: Genband US LLC
    Inventor: Yuan Li
  • Patent number: 8848530
    Abstract: Described is a system and method for providing differentiated service levels. The method comprising receiving a packet stream including a plurality of packets. A level of service to be provided to the packet stream is determined. An impairment to the packet stream is determined as a function of the level of service. The impaired packet stream is outputted.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: September 30, 2014
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Michael Koptiw, Steven Michelson
  • Publication number: 20140286359
    Abstract: A circuit for processing Carrier Aggregation (CA) is provided. The circuit includes a plurality of Component Carrier (CC) processors, each CC processor configured to estimate a frequency offset for a related CC and to compensate the estimated frequency offset, a reference clock generator configured to generate a reference clock using a reference frequency offset as one of frequency offsets output from the plurality of CC processors, a plurality of reception Phase Lock Loop (PLL) units, each reception PLL unit configured to generate a reception carrier frequency for the related CC corresponding to the reference clock, and a plurality of transmission PLL units, each transmission PLL unit configured to generate a transmission carrier frequency for the related CC corresponding to the reference clock.
    Type: Application
    Filed: January 10, 2014
    Publication date: September 25, 2014
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Joo-Hyun DO, In-Hyoung KIM
  • Patent number: 8842626
    Abstract: Briefly, in accordance with one or more embodiments, mobile station or user equipment receives pilot signals from two or more infrastructure nodes in a distributed antenna system, and calculates phase or timing information, or combinations thereof, from the pilot signals. The mobile station feeds back the phase or timing information, or combinations thereof, to the infrastructure nodes, and then receives one or more subsequent transmissions from the infrastructure nodes with phase shift or timing adjustments, or combinations thereof, calculated by the infrastructure nodes and applied to the spatial streams transmitted by the infrastructure nodes.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: September 23, 2014
    Assignee: Intel Corporation
    Inventors: Alexei Davydov, Alexander Maltsev, Gregory V. Morozov, Vadim Sergeyev, Yuan Zhu, Kamran Etemad, Xiangying Yang, Yujian Zhang
  • Publication number: 20140269782
    Abstract: An apparatus for compensating for a skew is provided between data signals supplied through a plurality of data lines and a clock signal supplied through a clock line. A skew compensation apparatus includes a plurality of data receivers each configured to delay a data signal supplied through a corresponding data line based on associated phase difference data and to output the delayed data signal, a clock receiver configured to receive a clock signal supplied through a clock line, and a phase controller configured to select any one of the plurality of data receivers and to output, to the selected data receiver, a phase control signal configured to correct the phase difference data of the selected data receiver based on the phase difference between a data signal output from the selected data receiver and the clock signal.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 18, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventors: Hee-Sun Ahn, Jae-Goo Lee, Choong-Sun Shin, Young-Uk Won, In-Bok Song
  • Patent number: 8837531
    Abstract: A system and method for transmitting and recovering external clock signals over links of a DSL system in which the external clock signals are used to synchronize transmitted physical layer signals from a CO of a DSL system and said external clock signals are derived from the received physical layer signals at an RT/CPE location of a DSL system. A clock recovery subsystem located at both the CO and the RT/CPE comprises a clock monitor circuit in communication with a Phase Lock Loop circuit. The clock monitor circuit at the RT/CPE is able to derive clock signals from the received physical layer signals and select one of said derived clocks to which a local reference clock at the RT/CPE is synchronized. The synchronized local reference clock, which can exist even when there are no valid derived clocks, may be used to transmit pseudowire frames (e.g., TDM data over Ethernet).
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: September 16, 2014
    Assignee: Actelis Networks (Israel) Ltd.
    Inventors: Edward Beili, Mauricio Nurko
  • Patent number: 8837532
    Abstract: A frame transmission device includes: a clock section; a path control section to switch a plurality of transmission paths for exchanging a time synchronization frame with a node device that measures a reference time; a fluctuation estimation section to set a fluctuation estimate of a transmission delay of the time synchronization frame on each of the plurality of transmission paths; and a time synchronization section to synchronize the clock section to the reference time in accordance with a time synchronization frame exchanged on a selected transmission path selected from among the plurality of transmission paths based on the fluctuation estimate.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: September 16, 2014
    Assignee: Fujitsu Limited
    Inventor: Masatake Miyabe
  • Patent number: 8824612
    Abstract: Apparatuses, circuits, and methods are disclosed for reducing or eliminating unintended operation resulting from metastability in data synchronization. In one such example apparatus, a sampling circuit is configured to provide four samples of a data input signal. A first and a second of the four samples are associated with a first edge of a latching signal, and a third and a fourth of the four samples are associated with a second edge of the latching signal. A masking circuit is configured to selectively mask a signal corresponding to one of the four samples responsive to the four samples not sharing a common logic level. The masking circuit is also configured to provide a decision signal responsive to selectively masking or not masking the signal.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: September 2, 2014
    Assignee: Micron Technology, Inc.
    Inventor: Yantao Ma
  • Patent number: 8824613
    Abstract: There is provided a signal transmission device including a first communication module including a first signal transmission unit for transmitting a first transmission signal having first amplitude to a second communication module through a predetermined transmission path, and the second communication module including a second signal transmission unit for transmitting a second transmission signal having second amplitude different from the first amplitude to the first communication module through the predetermined transmission path, and a transmission timing adjustment unit for adjusting a transmission timing of the second transmission signal by the second signal transmission unit so that a transition timing of the first transmission signal transmitted from the first communication module and a transition timing of the second transmission signal coincide with each other at a receiving end of the first communication module.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: September 2, 2014
    Assignee: Sony Corporation
    Inventors: Tatsuo Shimizu, Takeshi Maeda, Uichiro Omae
  • Publication number: 20140241344
    Abstract: A method includes receiving in a network element a packet, which includes a delay field that indicates an overall time delay accumulated by the packet until arriving at the network element. Upon receiving the packet, an interim value is substituted in the delay field. The interim value is indicative of a difference between the overall time delay and an arrival time of the packet at the network element. Before sending the packet from the network element, the overall time delay is updated in the delay field based on the interim value and on a departure time at which the packet is to exit the network element. The packet, including the updated overall time delay, is transmitted from the network element.
    Type: Application
    Filed: February 27, 2013
    Publication date: August 28, 2014
    Applicant: MELLANOX TECHNOLOGIES LTD.
    Inventors: Miriam Menes, Freddy Gabbay, Zachy Haramaty
  • Patent number: 8818315
    Abstract: Signal quality of a composite received signal in a radio communication network is optimized by adjusting a phase offset between received and/or transmitted signals based on signal quality parameters of the received and/or transmitted signals. The phase offset is adjusted by varying the phase offset between the received or transmitted signals such that that the composite signal is circularly, elliptically, or linearly polarized. The phase offset between the received or transmitted signals is continually adjusted based on the received signal quality parameters.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: August 26, 2014
    Assignee: AT&T Mobility II LLC
    Inventors: John E. Lewis, Melvin D. Frerking, David G. Shively
  • Patent number: 8817802
    Abstract: A method of hitless switching over a communications link, the method comprising transmitting, by a first modulator to a remote receiver, a first carrier signal having a first center frequency, enabling, by a second modulator to the remote receiver, transmission of a second carrier signal having a second center frequency while the first modulator is transmitting the first carrier signal, increasing, through the second modulator, a power level of the second carrier signal while the first carrier signal is transmitting, simultaneously decreasing, through the first modulator, a power level of the first carrier signal while the power level of the second carrier signal is increasing, and disabling transmission of the first carrier signal to the remote receiver when the power level of the second carrier signal reaches a predetermined level.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: August 26, 2014
    Assignee: Comtech EF Data Corp.
    Inventors: Wallace Davis, Valentine J. Rhodes, Michael Beeler
  • Patent number: 8811337
    Abstract: A radio terminal 10 includes a radio communication unit 11 configured to receive packets at predetermined intervals through a first network 100 or a second network 200, a buffer 15 configured to temporarily store packets received by the radio communication unit 11, another radio communication unit 11 configured to transmit a preparation request requesting a preparation of handover from the first network 100 to the second network 200, and an application processor 16 configured to reproduce the packets stored in the buffer 15 at a predetermined rate determined according to the predetermined interval. The application processor 16 decreases the amount of the packets stored in the buffer 15 by changing a packet reproducing rate to a rate higher than the predetermined rate in response to the transmission of the preparation request.
    Type: Grant
    Filed: July 15, 2009
    Date of Patent: August 19, 2014
    Assignee: Kyocera Corporation
    Inventor: Tomoyoshi Yokota
  • Patent number: 8804606
    Abstract: In a satellite-based communication network comprised of a central hub and plurality of remote terminals configured to transmit data to and receive data from the central hub in accordance with EN 301 790 (DVB-RCS), and where one or more of these remote terminals may be configured to include an additional receiver module configured to receive MF-TDMA transmission of other remote terminals, a mesh receiver and methods for coupling the mesh receiver with the host remote terminal. In addition, described herein are methods for synchronizing the mesh receiver on the network's timing and frequency and for utilizing the available link power for achieving efficient connectivity.
    Type: Grant
    Filed: August 10, 2009
    Date of Patent: August 12, 2014
    Assignee: Gilat Satellite Networks Ltd.
    Inventors: Snir Brener, Eran Haccoon, Haim Halfon, Guy Levitas
  • Patent number: 8804773
    Abstract: The present invention relates to an apparatus and method for maintaining voice call quality over a packet network by providing optimal de-jitter buffer depth and rate of change of depth. Buffer depth and rate of change of buffer depth may be initially determined by classifying the incoming call. Classification of the incoming calls may be accomplished by categorizing calls into groups based on characteristics of the calls. The buffer depth and rate of change of depth may be further optimized at the start of calls based on voice-path delay and packet loss probability measurements over one or more calls of the same class such that the voice-path delay is minimized while maintaining a certain packet loss probability, the packet loss probability is minimized while maintaining a certain voice-path delay, or an R-factor, which is an objective measure of voice quality, is maximized.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: August 12, 2014
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Gagan Choudhury, Robert G. Cole
  • Patent number: 8797868
    Abstract: A network device of a communication network is configured to implement coordinated scheduling and processor rate control. In one aspect, packets are received in the network device and scheduled for processing from one or more queues of that device. An operating rate of a processor of the network device is controlled based at least in part on an optimal operating rate of the processor that is determined using a non-zero base power of the processor. For example, the operating rate of the processor may be controlled such that the processor either operates at or above the optimal operating rate, or is substantially turned off. The optimal operating rate of the processor may be selected so as to fall on a tangent line of a power-rate curve of the processor that also passes through an origin point of a coordinate system of the power-rate curve.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: August 5, 2014
    Assignee: Alcatel Lucent
    Inventors: Daniel Matthew Andrews, Yihao Zhang
  • Patent number: 8792402
    Abstract: A method and apparatus for coordinating communication in a wireless sensor network may include a plurality of nodes, such as routers, edge nodes, data accumulators and/or gateways. Time management functions, such as determining an elapsed time, may be controlled based on a detected temperature, e.g., a temperature detected at a node, and/or based on a detected clock skew between two or more clocks in two or more different devices. Accurate time management may allow for devices to more accurately coordinate communication instances, e.g., communication that occurs at periodic wake up times. A cluster head, such as a data accumulator, may be associated with a network after its initial formation and cause nodes in the network to alter their hierarchy in the network, thereby making the cluster head accumulator a parent to nodes in the network. Nodes having a relatively lower hop count may have a higher battery capacity than nodes having a higher hop count.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: July 29, 2014
    Assignees: Honeywell International SARL, Yokogawa USA, Inc.
    Inventors: Jay P. Werb, Victor A. Berry
  • Patent number: 8787190
    Abstract: A system, a network node, a router, a method and a program used to determine a bottleneck bandwidth on a multi-hop path between a source and destination node is presented. The method comprises receiving probe packets by a first hop node in the multi-hop path, measuring a bandwidth on a link between the first hop node and a next hop node in the multi-hop path, generating a bandwidth discovery packet including the measured bandwidth, transmitting the BDP to the next hop node, relaying the probe packets to the next hop node, and determining if the next hop node is a last-hop node on the multi-hop path. A last hop node records the measured bandwidth from the BDP, adjusts the delay between the probe packets based upon the bandwidth and relaying the probe packets to the destination node. The destination node determines the bottleneck bandwidth based on the delay between the probe packets.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: July 22, 2014
    Assignee: TT Government Solutions, Inc.
    Inventors: Stuart Wagner, James Giacopelli
  • Patent number: 8781052
    Abstract: A system and method are described to provide a next generation cable gateway/modem based on the DOCSIS standard with a scheme to synchronously combine channels in the physical layer to increase overall bit rates for coaxial cable data transmission. The systems and methods synchronize the counters associated with multiple channels, including continuity counters, at the transmitter to zero and then allow the counters on individual channels to increment individually. At the receiver, individual channel delays of individual channels will be thus recognizable based on the information provided by the counters associated with each channel. A buffer at the receiver is informed and used to individually delay one or more of the multiple channels to marry up continuity counter values. In this manner, the buffer acts to essentially equalize delays in individual channels with the continuity counter representing the mechanism for specifying the individual delays for the separate channels.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: July 15, 2014
    Assignee: Intel Corporation
    Inventors: Bernard Arambepola, Shaul Shulman, Naor Goldman, Amos Klimker, Noam Tal
  • Patent number: 8781048
    Abstract: An apparatus for synchronizing audio data and visual data and a method therefor are provided. The apparatus includes a splitter, a synchronization unit coupled to the splitter, an audio control unit coupled to the splitter and the synchronization unit, and a visual data processing unit coupled to the splitter and the synchronization unit. The splitter receives an application layer data frame including audio data and visual data and splits the visual data from the audio data. The synchronization unit receives audio timing information of the audio data and acquires synchronization information according to the audio timing information and external timing information. The audio control unit receives and temporarily stores the audio data and outputs the audio data according to the synchronization information. The visual data processing unit analyzes and temporarily stores the visual data and outputs the visual data together with the audio data according to the synchronization information.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: July 15, 2014
    Assignee: KeyStone Semiconductor Corp.
    Inventors: Shao-Hsuan Hung, Shih-Wei Chang
  • Patent number: 8780740
    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided in which VoIP traffic is scheduled in a way that focuses on controlling user latencies, by reshaping packet latency profiles of individual users to more efficiently utilize power/code resources. A feedback mechanism may utilize certain latency controllers to adjust a queuing delay and an over-the-air transmit time to meet latency targets. That is, system resources may be allocated in a wireless network by adjusting a latency target for a packet responsive to a user's packet latency history.
    Type: Grant
    Filed: May 6, 2010
    Date of Patent: July 15, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Eugene J. Baik, Jason F. Hunzinger, Vinay Chande, Jilei Hou
  • Patent number: 8774084
    Abstract: Systems and methodologies are described that facilitate synchronizing base stations in a wireless communication environment. A base station can receive a synchronization signal sent via a low reuse channel, which can be shared by a group of base stations. Further, the base station can align a clock associated therewith to the received synchronization signal. Moreover, the base station can coarsely align the clock to a first synchronization signal received upon a first subset of resources of the low reuse channel, and finely align the clock to a second synchronization signal received upon a second subset of resources (e.g., of the low reuse channel, of a separate channel, . . . ), where the second subset of resources can be reserved for transmission from at least one base station with at least a predetermined level of synchronous accuracy.
    Type: Grant
    Filed: August 10, 2009
    Date of Patent: July 8, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Ravi Palanki, Lei Xiao, Parag A. Agashe
  • Patent number: 8774227
    Abstract: In a method of recovering timing information over packet networks, a receiver receives a plurality of packet streams over different paths from the same source. The raw delays experienced by the timing packets for each stream are filtered to provide a filtered delay for each stream. The filtered delays are weighted based on the quality of each stream, and the weighted filtered delays are then combined to form an aggregate delay estimate. Frequency adjustments for a local clock at the receiver are derived from the aggregate delay estimate.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: July 8, 2014
    Assignee: Microsemi Semiconductor ULC
    Inventor: Kamran Rahbar
  • Patent number: 8767778
    Abstract: A system for synchronizing unrelated information or reference signals originating from multiple sources. The signals may be in different signal formats or subject to different delays at a receiving device. The system may include a master reference time generator connected to at least one of a plurality of slave reference signal generators via a packet network. The master reference time generator may include a master reference time counter and a sampling device for sampling the master reference time counter. The master reference time generator may encode time data in master reference time packets and feed these packets into the packet network. The slave reference signal generator(s) is adapted to accept the encoded time data as an input to generate a reference signal, the phase of which is calculated based on the time elapsed since an initial time point.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: July 1, 2014
    Assignee: Imagine Communications Corp.
    Inventors: Paul E. Briscoe, Leigh A. Whitcomb, Michel A. Poulin
  • Patent number: 8761207
    Abstract: A system and method for separating clock recovery for a pseudowire communication. An incoming signal is received for a pseudowire communication. The incoming signal is separated into a first signal and a second signal. Packets within the first signal are ordered in a first register. A clock signal is extracted from the second signal in a second register to generate a modified clock signal. A delay is incurred during generating of the modified clock signal. The first signal is communicated utilizing the modified clock signal.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: June 24, 2014
    Assignee: CenturyLink Intellectual Property LLC
    Inventor: Michael K. Bugenhagen
  • Patent number: 8755411
    Abstract: Systems and methods to measure the performance of a de-jitter buffer are disclosed. An example method includes transmitting a known audio signal via a plurality of packets over a packet-based network, recording a received signal based on the known audio signal, analyzing the recorded signal to determine one or more of a lower size, an upper size, an expansion speed, or a contraction speed of a de-jitter buffer based on the recorded signal and the known signal, comparing the one or more of the lower size, the upper size, the expansion speed, or the contraction speed to a performance requirement, and correcting communication network performance based on the comparison. Determining the expansion speed includes filling a lower portion of the de-jitter buffer, adding jitter to the plurality of packets, the jitter increasing at a first rate, and identifying the expansion speed as the first rate if no packet loss occurs.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: June 17, 2014
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Bing Chen, David Ramsden
  • Patent number: 8750335
    Abstract: In response to communications from a first device to a second device, respective phase differences are estimated between a first clock of the first device and a second clock of the second device. A first average phase difference is computed within a percentile of a first subset of the respective phase differences. The percentile is less than 100. A second average phase difference is computed within the percentile of a second subset of the respective phase differences. The second subset is a modification of the first subset. The second average phase difference is computed in response to the first average phase difference and the modification.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: June 10, 2014
    Assignee: Anue Systems, Inc.
    Inventor: Charles Albert Webb, III
  • Patent number: 8750282
    Abstract: A system generates one or more media streams from time-stamped packets received over a network. The packets may include audio, video, or a combination of both, sampled at a rate determined by a master media clock at a transmitter of the time-stamped packets or at some other node on the network. Timestamps in the packets may be presentation times based on values of a remote real-time clock at the transmitter that is synchronized with a local real-time clock at a receiver. The system may generate the media streams from the media stream samples and present the sampled data according to the presentation times.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: June 10, 2014
    Assignee: Harman International Industries, Incorporated
    Inventors: Aaron Gelter, Brian Parker, Robert Boatright
  • Patent number: 8744082
    Abstract: A system and method for securing wireless communications are provided. A method for secure communications by a first user includes estimating a channel between the first user and a second user based on a pilot signal transmitted by the second user, determining a first threshold and a second threshold based on the estimate of channel, selecting a first subset of channel estimates, signaling the first subset of channel estimates to the second user, receiving a second subset of channel estimates from the second user, for each channel estimate in the second subset of channel estimates, quantizing the channel estimate based on a relationship between a gain of the channel estimate and the first threshold and the second threshold, generating a first secret key based on quantized channel estimates, verifying that the first secret key matches a second secret key generated by the second user, and transmitting information to the second user.
    Type: Grant
    Filed: November 3, 2010
    Date of Patent: June 3, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventors: Hung D. Ly, Yufei Blankenship, Tie Liu
  • Patent number: 8744016
    Abstract: A receiving apparatus includes a symbol timing detection unit, a Fourier transform unit, a first symbol timing correction unit, and an interpolation synthesis unit. The symbol timing detection unit is configured to detect a Fourier transform start position from a received transmitting signal of a symbol unit, the Fourier transform unit is configured to perform a Fourier transform using the detected Fourier transform start position. The first symbol timing correction unit is configured to calculate and correct an amount of change between the Fourier transform start position of a reference symbol and the detected Fourier transform start position, and the interpolation synthesis unit is configured to perform an interpolation synthesis of a plurality of delay profiles corresponding to a plurality of symbols including the reference symbol and a symbol in which the amount of change is corrected.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: June 3, 2014
    Assignees: Fujitsu Limited, Fujitsu Semiconductor Limited
    Inventors: Hiroaki Takagi, Naoto Adachi, Masataka Umeda
  • Patent number: 8737379
    Abstract: In order to perform synchronization and compensate clock drift among a plurality of communication devices interconnected to form a mesh communications network, all communication devices, except one given communication device, perform a first distributed consensus-based synchronization. The given communication device performs: obtaining a first correction information derived at least from a difference between a clock timing resulting from the first distributed consensus-based synchronization and a reference clock timing; and transmitting the first correction information through the mesh communications network. All the communication devices, except said given communication device, further perform updating the clock timing resulting from the first distributed consensus-based synchronization by taking into account the transmitted first correction information.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: May 27, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nicolas Gresset, Jonathan Letessier
  • Patent number: 8731005
    Abstract: A radio system and a method for relaying packetized radio signals is disclosed. The radio system and the method provide a calibration of transmit signals. Furthermore the radio system and the method provide a measurement of a transmit power level. The radio system comprises at least one transmit path, a calibration unit, a base band calibration signal generator synchronized to a synchronization unit, at the least one link and a power sensor. A portion of a selected one of coupled transmit signals is forwarded to a power sensor for measuring a power level, wherein the calibration unit is adapted to update a transmit power level of the at least one transmit path in response to the transmit power level of the selected one of the coupled transmit signals.
    Type: Grant
    Filed: October 12, 2009
    Date of Patent: May 20, 2014
    Assignee: Kathrein-Werke KG
    Inventor: Johannes Schlee
  • Patent number: 8730950
    Abstract: Systems and methods can include converting multi-channel circuit switched voice data to packet-switched voice over internet protocol (VoIP). A multi-channel connection originating from one or more customer premise equipment private branch exchanges can be terminated at a channel to packet gateway device. Call data originating from multiple customer premise equipment telephony devices can be received through the multi-channel connection associated with the one or more customer premise equipment private branch exchanges, and can be processed at the channel to packet gateway device responsive to call control instruction information. The payload data associated with the call data can be packaged according to predetermined packaging rules and transmitted according to VoIP.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: May 20, 2014
    Assignee: ARRIS Enterprises, Inc.
    Inventor: Carol Ansley
  • Patent number: 8731073
    Abstract: Methods, systems, and apparatuses are described for aligning lanes of low speed serial links coupled to a transceiver. The transceiver cooperatively performs lane alignment operations with a low speed device during initialization of the transceiver and the low speed device. The lane alignment operations are performed in-band using the low speed serial links, and therefore, do not require additional out-of-band-signaling wires between the transceiver and the low speed device to perform the lane alignment operations. The lane alignment operations may be performed by a handshaking process performed by the transceiver and the low speed device, where the transceiver and the low speed device provide training pattern(s) of data that are used to align the low speed serial links. The low speed serial links are continuously monitored after initialization is complete to detect various transient impairments and to re-initiate lane alignment operations in response to detecting such impairments.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: May 20, 2014
    Assignee: Broadcom Corporation
    Inventor: Whay Sing Lee
  • Publication number: 20140126587
    Abstract: A video signal and an audio signal are TMDS transmitted from a source device to a sink device. Through a reserved line and a HPD line provided separately from a TMDS transmission line, an Ethernet™ signal is bidirectionally transmitted, and also, a SPDIF signal is transmitted from the sink device to the source device. The Ethernet™ signal bidirectionally transmitted between Ethernet™ transmitter/receiver circuits is differentially transmitted by an amplifier and is received by the amplifier. The SPDIF signal from a SPDIF transmitter circuit is common-mode transmitted from an adder and is received by the adder to be supplied to the SPDIF receiver circuit.
    Type: Application
    Filed: December 6, 2013
    Publication date: May 8, 2014
    Applicant: Sony Corporation
    Inventors: Gen Ichimura, Hidekazu Kikuchi, Yasuhisa Nakajima
  • Patent number: 8718102
    Abstract: A method that implements a timing advance for an uplink communication from a user equipment (UE) comprises: selecting at least one subframe; reducing a duration of at least one selected symbol of each of the at least one subframe to generate at least one reduced duration subframe; replacing a remaining portion of payload data of each of the at least one selected symbol with a pre-selected replacement value; by-passing each of the at least one selected symbol during pre-transmission processing of the at least one reduced duration subframe; processing any remaining symbols of the at least one reduced duration subframe, such that a processing time of the remaining symbols of the at least one reduced duration subframe is reduced by at least the value of the timing advance; and transmitting the at least one reduced duration subframe via the uplink communication to the base station.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: May 6, 2014
    Assignee: Intel Corporation
    Inventors: Yun H. Kim, Christopher P. Larosa, Bryan S. Nollett
  • Patent number: 8717972
    Abstract: The present invention provides a method for range extension is wireless communication systems. One embodiment of the method includes determining whether a mobile unit is within a first range corresponding to a range of timing advances supported by a timing advance command. This embodiment also includes transmitting a plurality of timing advance commands to the mobile unit when the mobile unit is outside the first range so that the mobile unit can synchronize with the base station by combining information in the plurality of timing advance commands.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: May 6, 2014
    Assignee: Alcatel Lucent
    Inventors: Fang-Chen Cheng, Jung Ah Lee
  • Publication number: 20140119391
    Abstract: A packet transmission device includes first and second clocks, a communication unit, and first and second synchronization processing units. The communication unit transmits and receives a synchronization packet to and from an external time source device. The first synchronization processing unit synchronizes the first clock with the external time source device in accordance with time information of the synchronization packet. The second synchronization processing unit synchronizes the second clock with the first clock.
    Type: Application
    Filed: August 20, 2013
    Publication date: May 1, 2014
    Applicant: FUJITSU LIMITED
    Inventor: Kanta YAMAMOTO
  • Patent number: 8711886
    Abstract: The invention concerns a device for transmitting packets in a packet communication network comprising at least two stations, characterized in that it includes means for: extract image cues from a synchronizing signal, initializing a first counter based on said image cues, initializing a second counter every “m” zero crossing of the first counter, sampling the second counter at all the Tech periods, where Tech is derived from a time base synchronized on all the network stations, and transmitting packets containing the samples in the network. The invention also concerns a device for receiving packets in a packet communication network comprising at least two stations.
    Type: Grant
    Filed: March 13, 2007
    Date of Patent: April 29, 2014
    Assignee: Thomson Licensing
    Inventors: Thierry Tapie, Serge Defrance, Bertrand Huguies
  • Patent number: 8711884
    Abstract: A data communication system includes a data transmitting apparatus and a data receiving apparatus. The data transmitting apparatus includes a packetizing section that generates data packets, an encoding section that performs redundant encoding on the data packets in predetermined time units and generates encoded blocks, a data transmitting section that transmits each encoded block to the data receiving apparatus, a data-size acquiring section that acquires a data size of transmission data in each predetermined time unit, and a packet-size determining section that, on the basis of the acquired data size, in each predetermined time unit, determines a packet size of each data packet. The data receiving apparatus includes a data receiving section that acquires data packets of the transmission data by receiving each encoded block transmitted, and a depacketizing section that analyzes the data packets of the acquired transmission data and reconfigures the transmission data.
    Type: Grant
    Filed: September 19, 2011
    Date of Patent: April 29, 2014
    Assignee: Sony Corporation
    Inventor: Yoshinobu Kure
  • Patent number: 8705435
    Abstract: A nodal division multiple access technique for multiple access to a communications channel such as a satellite transponder. The present invention provides multiple access into a communications channel where each accessing site utilizes one signal from a composite amplitude/phase digital signal constellation, such that demodulators receive the composite signal without changes in the system design related to the multiple access operation.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: April 22, 2014
    Assignee: The DIRECTV Group, Inc.
    Inventors: John P. Godwin, Ernest C. Chen
  • Patent number: 8699424
    Abstract: The subject invention relates to a system and/or methodology that provide improved wireless networking performance by dynamically adapting the channel width. A dynamic adaptation component adjust the channel width based on at least one characteristic of a wireless network, the characteristics can include but are not limited to range, power consumption, throughput, signal to noise ratio (SNR), resilience to delay spread, data rate, and capacity. Additionally, an optimization component can determine an optimum channel width.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: April 15, 2014
    Assignee: Microsoft Corporation
    Inventors: Ranveer Chandra, Ratul Mahajan, Thomas Moscibroda, Paramvir Bahl, Ramya Raghavendra
  • Patent number: 8693355
    Abstract: A technique for jitter buffer management for improved power savings in a wireless communication device (100) includes defining (202) a jitter buffer threshold for the wireless communication device, determining (204) that an amount of packets in the jitter buffer falls below the threshold, sending a trigger (206) to obtain queued voice packets from an access point, downloading (208) queued voice packets from the access point, and adding (212) the voice packets from the access point to the jitter buffer in the wireless communication device (100).
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: April 8, 2014
    Assignee: Motorola Solutions, Inc.
    Inventor: Soren L. Lundsgaard