Mutual (reciprocal) Synchronization Patents (Class 370/507)
  • Patent number: 10477539
    Abstract: A method of transmitting data between an electronic transmitter device and an electronic receiver device connected together by a data link, the method comprising the steps of: sending the data in the form of at least three identical frames sent in succession and each associated with respective checkdata calculated on the frame in question; and the electronic receiver device verifying the validity of the received frames as they are being received and making the first valid frame available for processing while ignoring the others.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: November 12, 2019
    Assignee: SAFRAN ELECTRONICS & DEFENSE
    Inventors: Laurent Morel-Fourrier, Mathieu Conq, Nicolas Geneste
  • Patent number: 10462818
    Abstract: A method of transmitting data between network devices over a non-deterministic network with a multiple channel access method, wherein it is not possible to determine, whether a network device can access the non-deterministic network, wherein the non-deterministic network comprises a plurality of network devices. The method includes the steps of: synchronising clocks of individual network devices of the plurality of network devices with each other, dividing time available for transmitting the data into timeslots, designating respective pairs of consecutive timeslots to the individual network devices of the plurality of network devices, wherein an individual network device transfers data only during the respective pairs of timeslots designated to it and evaluating, whether a network device of the plurality of network devices shall retransmit data, which it has already transmitted during a first timeslot of a pair timeslot, within the second timeslot of the pair of timeslots.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: October 29, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Anton Prins, Hans S. P. Van Der Schaar
  • Patent number: 10437851
    Abstract: A latest status record of an object in a local storage node is obtained as a local status record of the object. The status record includes a name of an operation changing the object, a timestamp of the operation changing the object, a first status flag, and a second status flag. The first status flag indicates whether a synchronization of the object from current object storage node to another object storage node is executed. The second status flag indicates whether a synchronization of the object from another object storage node to the current object storage node is executed. The latest status record of the object is obtained of the object in from a remote object storage node as a remote status record of the object. A synchronization of the object is executed based on the local status record and the remote status record.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: October 8, 2019
    Assignee: International Business Machines Corporation
    Inventors: Hai Ji, Yuan Yuan Li, Xiaoyang Yang, Chun Guang Zeng
  • Patent number: 10433271
    Abstract: A Node-B sends a polling message to a wireless transmit/receive unit (WTRU). The WTRU sends an uplink synchronization burst in response to the polling message without contention. The Node-B estimates an uplink timing shift based on the synchronization burst and sends an uplink timing adjustment command to the WTRU. The WTRU then adjusts uplink timing based on the uplink timing adjustment command. Alternatively, the Node-B may send a scheduling message for uplink synchronization to the WTRU. The WTRU may send a synchronization burst based on the scheduling message. Alternatively, the WTRU may perform contention-based uplink synchronization after receiving a synchronization request from the Node-B. The WTRU may enter an idle state instead of performing a handover to a new cell when the WTRU moves to the new cell. A discontinuous reception (DRX) interval for the WTRU may be set based on activity of the WTRU.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: October 1, 2019
    Assignee: InterDigital Technology Corporation
    Inventors: Jin Wang, John S. Chen, Mohammed Sammour, Stephen E. Terry, Arty Chandra, Guodong Zhang
  • Patent number: 10432349
    Abstract: Data Block Transmission with Variable Retransmission Feedback Time For communicating data between a transmitter (10) and a receiver (14), wireless transmission of data blocks is implemented on the basis a retransmission protocol with variable value of a feedback time. The feedback time defines a time interval between transmission of one of the data blocks (22) and transmission of a feedback message (23) indicating whether the data block (22) was successfully received. The transmitter (10) or the receiver (14) determines the value of the feedback time. Depending on the determined value of the feedback time, the transmitter (10) controls transmission of the data block (22) to the receiver and/or the receiver (14) controls reception of the data block (22) at the receiver (14). The transmitter (10) may for example be a base station of a mobile network, and the receiver (14) may be a terminal device connected to the mobile network.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: October 1, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Leif Wilhelmsson, Johan Rune, Joachim Sachs, Anders Wallén
  • Patent number: 10410698
    Abstract: A wave pipeline includes a plurality of data paths, a clock signal path, and a return clock signal path. Each data path includes an input node, an output node, and a data stage between the input node and the output node. Each data path has a different delay between the input node and the output node. A first data path of the plurality of data paths has a first delay and each of the other data paths of the plurality of data paths have a delay less than the first delay. The clock signal path provides a clock signal to the data stage of each data path. The return clock signal path provides a return clock signal from the data stage of the first data path. The return clock signal triggers data out of the data stage of each data path of the plurality of data paths.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: September 10, 2019
    Assignee: Micron Technology, Inc.
    Inventors: Kaveh Shakeri, Ali Feiz Zarrin Ghalam
  • Patent number: 10305673
    Abstract: A method is disclosed for use by a network element comprising a plurality of ports for communicating a common clock signal with one or more neighboring network elements. The method comprises, for at least one port of the plurality of ports, determining, while the port is in a predefined listening mode, whether the port is connected with a neighboring network element; and calculating, when the port is connected, a respective clock phase delay value between the network element and the neighboring network element. The method further comprises, based on a role assigned to the network element from a plurality of predefined roles, assigning a clock signal synchronization role to the port. The network element is configured to communicate the common clock signal using the clock phase delay value and using the clock signal synchronization role.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: May 28, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Nisha Ayikkara, Piyush Jaju, Rohith Sreenivasan, Siddalingaprasad Kori, Basavalinga Kullashetty
  • Patent number: 10298346
    Abstract: In one embodiment, a method comprises receiving, by a network device, one or more advertisement messages comprising timing information describing a quality of a network clock that is originated by a master clock device at a root of a directed acyclic graph (DAG); the network device executing an objective function for the DAG providing an optimized loopless time topology for the network clock, synchronized to the master clock device, based on the timing information; and the network device attaching to a parent device in the DAG based on the objective function, for optimized generation of the network clock by the network device.
    Type: Grant
    Filed: June 2, 2016
    Date of Patent: May 21, 2019
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Pascal Thubert, Laurent Montini
  • Patent number: 10275375
    Abstract: A method for communication includes receiving in a network interface controller (NIC) from a host processor, which has a local host memory and is connected to the NIC by a local bus, a remote direct memory access (RDMA) compress-and-write command, specifying a source memory buffer in the local host memory and a target memory address. In response to the command, data are read from the specified buffer into the NIC, compressed in the NIC, and conveyed from the NIC to the target memory address.
    Type: Grant
    Filed: March 10, 2013
    Date of Patent: April 30, 2019
    Assignee: MELLANOX TECHNOLOGIES, LTD.
    Inventor: Ali Ayoub
  • Patent number: 10075166
    Abstract: A circuit generates a number of oscillations. The circuit includes a first branch with at least one delay line introducing symmetrical delays on rising edges and on falling edges and at least one asymmetrical delay element introducing different delays on rising edges and on falling edges. The circuit further includes a second branch looped back on the first branch and including at least one delay line introducing symmetrical delays on rising edges and on falling edges.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: September 11, 2018
    Assignee: STMicroelectronics (Rousset) SAS
    Inventors: Albert Martinez, Michel Agoyan, Jean Nicolai
  • Patent number: 9979621
    Abstract: A method to provide a cyber attack resistant and fault tolerant precision clocking scheme for wide area critical infrastructure networks through what is called Distributed Time Source Validation, DTSV, is provided, which is a distributed algorithm and signaling mechanism for a network to detect a compromised time source or sources in a multiple master clock system. The method includes providing a local clock signal, receiving in a node R1 an external clock signal from an external source, C or S1, estimating based on the local clock signal and the external clock signal timing parameters associated with the first node and the external source, comparing the timing parameters to detect any Mutual Clock Discrepancy (MCD) between the first node and the external source, and distributing any detected MCD in the network.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: May 22, 2018
    Assignee: NET INSIGHT INTELLECTUAL PROPERTY AB
    Inventor: Magnus Danielsson
  • Patent number: 9973601
    Abstract: Fault tolerant and redundant grand master clock scheme may reduce or eliminate precision time transition caused by a network link or device failure. A primary synchronization message may be sent by a primary grandmaster clock and one or more backup synchronization message may be sent by respective backup grandmaster clocks. The primary and backup grandmaster clocks may be concurrently operated. The primary and backup synchronization messages may be sent to an end station over a network. The end station may derive a local clock based on one, some, or all of the received messages. The end station may or may not distinguish between the messages based on the clock source. The end station may validate messages received from a particular clock source.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: May 15, 2018
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Eric John Spada, Yongbum Kim
  • Patent number: 9912532
    Abstract: Methods, computer systems, and computer program products for configuring ports of interconnected communications equipment include, defining configuration parameters for at least one port of a plurality of ports of a plurality of interconnected communications devices; defining a group of the at least one port of the plurality of ports of the plurality of interconnected communications devices into a configuration group; and creating an explicit link mirroring the defined configuration parameters of the at least one port of the plurality of ports of the plurality of interconnected communications devices to the defined configuration group of at least one port of the plurality of ports of the plurality of interconnected communications devices, such that changes made to the defined configuration parameters are replicated and synced to the defined configuration group.
    Type: Grant
    Filed: February 4, 2015
    Date of Patent: March 6, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Tara Astigarraga, Jose R. Mosqueda Mejia, Laura M. Reid, Scott R. Ratzloff
  • Patent number: 9813176
    Abstract: The invention relates to data networks, and in particular relates to a method and apparatus for forming and processing data units to enable the transfer of clock quality information in data networks. A method of forming a higher order data unit, comprising payload data and overhead data, from a plurality of lower order data units, is disclosed. The payload of the higher order data unit is formed by combining the plurality of lower order data units. The overhead data of the higher order data unit includes clock quality information relating to clocks associated with the plurality of lower order data units. Embodiments provide a way of transporting clock quality information relating to clocks associated with a number of lower order data units within a single higher order data unit, and enables intermediate networks easily to access the clock quality information.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: November 7, 2017
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Sergio Lanzone, Orazio Toscano
  • Patent number: 9749073
    Abstract: A technique for facilitating clock recovery in a node of a packet-based network is disclosed. The node is synchronized with other nodes based on a master-slave clock mechanism. A list of backup master clock node is maintained for the node, which includes at least one backup master clock node for the node, and in response to occurrence of a synchronization related event, a master clock node of the node is switched from the current master clock node to a backup master clock node selected from the list. A master clock node reselection message is generated and transmitted to the switched backup master clock node for the switched backup master clock node to reselect its master clock node.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: August 29, 2017
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Qingfeng Yang, Francesco Pasio
  • Patent number: 9641268
    Abstract: A method for synchronizing clocks, including: receiving at least two clock signals, where the at least two clock signals are sent by a bidirectional clock tracking link respectively corresponding thereto; setting two or more clock signals coming from a same network element into a same clock source group; selecting one clock signal in a same clock source group as a currently tracked clock signal; and if the currently tracked clock signal belongs to the clock source group, respectively sending a standby clock signal carrying quality-level do not use information by using the bidirectional clock tracking link respectively corresponding to each of the clock signals in the clock source group. The present invention achieves the effect that in the scenario where there are two or more bidirectional clock tracking links between two network elements, a clock tracking loop will not be generated.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: May 2, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Hao Li, Jun Xing, Xiaoyu Tang, Qixiang Zhong
  • Patent number: 9632528
    Abstract: There is provided an information processing apparatus including a virtual clock controller configured to update a first virtual clock on the basis of a system clock, and a synchronization part configured to perform given data synchronization processing with another information processing apparatus on the basis of the first virtual clock and a second virtual clock that is updated by the another information processing apparatus.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: April 25, 2017
    Assignee: SONY CORPORATION
    Inventors: Ken Miyashita, Kiyoshi Yoshikawa
  • Patent number: 9571214
    Abstract: According to an embodiment, a wireless communication unit includes a media access control (MAC) unit. The MAC unit includes a clock unit, an acquisition unit and a calculation unit. The clock unit includes a register which stores periodically counted-up first time information. The acquisition unit acquires a statistic for reception quality information on the received packet. The calculation unit normalizes the second time information, weights the normalized second time information using a time weight based on the statistic, and calculates a time correction value for correcting the first time information, using the weighted and normalized second time information. The time weight increases with increasing link stability indicated by the statistic.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: February 14, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuji Tohzaka, Hiroki Kudo, Takafumi Sakamoto
  • Patent number: 9515722
    Abstract: A method of configuring communications management on board an aircraft comprising the implementation of a mechanism for electing a master equipment item in a network of computer equipment items in charge of aircraft-ground communications of the aircraft and of configuring communication management according to the master equipment item. The method enables the applications in charge of the aircraft-ground communications to be distributed between the networked computer equipment items.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: December 6, 2016
    Assignee: Airbus Operations (S.A.S.)
    Inventors: Julien Abadie, Pierre Cuq, Stéphane Papet, Nicolas Rohrbacher, Guillaume Demarquet
  • Patent number: 9460803
    Abstract: A system includes a plurality of sensing devices, a first multiplexer, a plurality of local return clock signal paths, a second multiplexer, and a data latch. Each sensing device outputs data onto a respective local data path in response to a clock signal on a clock signal path. The first multiplexor passes data from a selected local data path to a global data path. Each local return clock signal path is coupled to the clock signal path at a respective sensing device such that each local return clock signal path is routed along with a respective local data path. The second multiplexor passes a return clock signal from a selected local return clock signal path corresponding to the selected local data path to a global return clock signal path. The data latch latches the data on the global data path into the data latch in response to the return clock signal on the global return clock signal path.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: October 4, 2016
    Assignee: Micron Technology, Inc.
    Inventors: Qiang Tang, Ali Feiz Zarrin Ghalam, Hoon Choi, Eric N. Lee, Ramin Ghodsi
  • Patent number: 9313705
    Abstract: When transmitting data from a data relay apparatus to a mobile station through a plurality of base stations, the plurality of base stations add sequence numbers to the data and transmits the data with the sequence number. The data relay apparatus transfers a first data and second data to the mobile station through different base stations among the plurality of base stations, in which the data relay apparatus transfers the first data received before the second data to one base station and transfers the second data while adding thereto information indicating the reception order of the first and second data. Each of the plurality of base stations, when the data transferred from the data relay apparatus contains the information added thereto, adds the sequence number to the data based on the information and transmits the data with the sequence numbers to the mobile station.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: April 12, 2016
    Assignee: FUJITSU LIMITED
    Inventor: Masatsugu Shimizu
  • Patent number: 9213360
    Abstract: The present invention provides a time setting system and method thereof that are capable of correctly setting time if a delay occurs in the transmission of time information. In the system for setting a master time outputted from a master apparatus to a slave time of a slave apparatus that counts time independently of the master apparatus, the slave apparatus has transmission section for transmitting master time request information to the master apparatus via a network and the master apparatus has an allowable range information acquisition section for acquiring allowable range information indicative of an allowable time in which the master time may be set to the slave time of the slave apparatus and transmission section for transmitting the master time and allowable range information to the slave apparatus.
    Type: Grant
    Filed: April 27, 2005
    Date of Patent: December 15, 2015
    Assignee: Sony Corporation
    Inventors: Tamotsu Ishii, Hiroshi Kuno, Shunichi Soma, Takamichi Hayashi
  • Patent number: 9155078
    Abstract: A method of operating a mobile station in a packet transfer mode includes receiving a distribution timing advance message on a control channel from a base station. The distribution timing advance message contains a plurality of mobile station identifiers and associated timing advance values. One of the mobile station identifiers is identified as corresponding to the mobile station. The timing advance value associated with the identified one of the mobile station identifiers is determined. The timing of an uplink transmission to the base station is then adjusted responsive to the timing advance value. Related mobile stations, methods of operating a base station subsystem to communicate timing advance values to a plurality of mobile stations, base station subsystems, and methods of operating a serving GPRS support node to control communication of timing advance values by a base station subsystem are also disclosed.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: October 6, 2015
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Marten Sundberg, Paul Schliwa-Bertling, John Walter Diachina
  • Patent number: 9137066
    Abstract: The present disclosure is directed at a method and apparatus for generating a metric for use in any one or more of lock detection, SNR estimation, and modulation classification. To generate the metric, an input angle in the form of a symbol phase or a difference in symbol phases is used to evaluate a base function. The base function relates possible metrics to possible input angles using a triangle wave having its maxima or minima at ideal input angles, and the other of its maxima or minima at angles midway the ideal input angles. Described are embodiments that are one or more of non-data aided; that may be implemented relatively efficiently in hardware; that can function using one sample/symbol; that can achieve relatively good detection certainty using relatively few estimates; and that can be used to implement modulation classifiers, lock detectors, and SNR estimators that are resilient to imperfections in automatic gain control.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: September 15, 2015
    Inventor: Yair Linn
  • Patent number: 9137766
    Abstract: Methods, devices, and computer program products for synchronization of wireless devices in a peer-to-peer network are described herein. In one aspect, a method for synchronizing a wireless communication apparatus is provided. The method includes receiving, at the wireless communication apparatus, one or more messages including one or more received time values. The method further includes updating a time value of a clock signal of the wireless communication apparatus to a value derived from the received time values in response to determining that a magnitude of a difference between the time value and the derived time value is greater than a threshold.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: September 15, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Santosh Paul Abraham, George Cherian, Yan Zhou
  • Patent number: 9065627
    Abstract: Transfer of differential timing over a packet network is provided. A transmitting service interface receives a service clock and is coupled to a receiving service interface through a network backplane. A primary reference clock is provided to time the network backplane. The primary reference clock and the service clock are used to synthesize a copy of the service clock connected to the transmitting service interface. A first control word containing an error differential between the service clock and the synthesized copy of the service clock is generated and transmitted through the network backplane via a packet. The first control word, together with the primary reference clock, is used to recreate the service clock for timing the receiving service interface.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: June 23, 2015
    Assignee: RPX Clearinghouse LLC
    Inventors: James Aweya, Michel Ouellette, Delfin Y. Montuno
  • Patent number: 9036539
    Abstract: The exemplary embodiment of the present invention provides a method of synchronizing a femtocell base station securing time synchronization of a femtocell base station by allowing the femtocell base station to transmit a symbol to a terminal belonging to the femtocell by performing the time synchronization with a preamble signal when the femtocell base station receives the preamble signal from the macrocell base station in an orthogonal frequency division multiple access (OFDMA) communication system in which a femtocell is present in a macrocell.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: May 19, 2015
    Assignee: Intellectual Discovery Co., Ltd.
    Inventors: Kwang Soon Kim, Young Jin Sang
  • Patent number: 9031593
    Abstract: A method for determining data enabling a plurality of secondary base stations to time their transmissions to a mobile station within a timing range. The mobile station obtains time delays of transmissions from each of the secondary base stations in reaching the mobile station, and determines time delay differences between the time delays and a reference time delay associated with a primary base station. The mobile station transmits the time delay differences to the plurality of secondary base stations. Each secondary base station receives the difference between its own transmission time delay and the reference time delay, compares the difference with a time range, and corrects the timing of its transmissions if the difference is outside of the time range.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: May 12, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Jingyi Liao
  • Publication number: 20150124842
    Abstract: Systems and methods for mapping an iterative time-based data acquisition (DAQ) operation to an isochronous data transfer channel of a network. A time-sensitive buffer (TSB) associated with the isochronous data transfer channel of the network may be configured. A data rate clock may and a local buffer may be configured. A functional unit may be configured to initiate continuous performance of the iterative time-based DAQ operation, transfer data to the local buffer, initiate transfer of the data between the local buffer and the TSB at a configured start time, and repeat the transferring and initiating transfer in an iterative manner, thereby transferring data between the local buffer and the TSB. The TSB may be configured to communicate data over the isochronous data transfer channel of the network, thereby mapping the iterative time-based DAQ operation to the isochronous data transfer channel of the network.
    Type: Application
    Filed: November 5, 2013
    Publication date: May 7, 2015
    Applicant: NATIONAL INSTRUMENTS CORPORATION
    Inventors: Sundeep Chandhoke, Brian Keith Odom
  • Patent number: 9008127
    Abstract: Certain aspects of a method and system for speed negotiation for twisted pair links in fiber channel systems are disclosed. Aspects of a method may include communicating data between fiber channel host devices communicatively coupled via a twisted pair link based on a common speed negotiated between the fiber channel host devices. At least one available speed may be determined for the communication of data between the fiber channel host devices over the twisted pair link. The determined available speeds for each of the fiber channel host devices may be exchanged via at least one fast link pulse signal. The common speed negotiated may be a highest available speed for the communication of data between the fiber channel host devices.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: April 14, 2015
    Assignee: Broadcom Corporation
    Inventors: Ali Ghiasi, Kevin Brown
  • Patent number: 9001849
    Abstract: A method of synchronizing a local estimation of global network time of a receiving node on a network to a global network time reference is provided. The free running nodes receive precise time protocol synchronization messages and determine a ratio and an offset based on time data extracted from the messages.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: April 7, 2015
    Assignee: General Electric Company
    Inventors: Pavlo Bobrek, Jeffrey VanDorp, Harry Molling
  • Patent number: 8971470
    Abstract: Techniques are described to provide a device and network of devices that collect distributed coordinated timestamps from distributed time counters in a multi-module or multi-integrated circuit system. The interconnect between the modules can be a single-wire or a two-wire interconnect. The modules communicatively coupled to the interconnect can use a collision-avoidance protocol for triggering the broadcasting of timestamps among the modules as well for allowing all modules to transmit their timestamps. Timestamps from multiple clocks can be transmitted by all modules and then collected and compared to produce correction factors to clock signals of each module to potentially achieve distributed clock synchronization in multiple independent modules or integrated circuits.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: March 3, 2015
    Assignee: Intel Corporation
    Inventor: Dmitrii Loukianov
  • Patent number: 8964722
    Abstract: A method for synchronizing a plurality of clocks arranged within a plurality of nodes of a packet-switching network comprises comparing parameters that relate to the plurality of clocks in order to determine master-slave relationships between the plurality of clocks, and exchanging time-stamped messages over the packet-switching network each time between a master clock and an associated slave clock to make the associated slave clock subservient to the master clock. A node of the packet-switching network comprises a frequency source controlled by a synchronous physical layer technology. The parameters that relate to a clock of the node comprise a parameter that relates to the frequency source to determine the master slave relationships based on one property of the frequency source.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: February 24, 2015
    Assignee: Alcatel Lucant
    Inventors: Michel Le Pallec, Dinh Thai Bui
  • Patent number: 8964792
    Abstract: A method and a system for controlling a compressed mode in a macro-diversity state are provided by the disclosure, wherein the method comprises that a terminal and a serving node B determine a compressed mode, wherein the compressed mode comprises: transmission gap pattern sequence information; the terminal and the serving node B start or stop the compressed mode, the terminal or the serving node B indicates a current compressed mode state to a related node B, and the related node B performs compressed mode operation according to the current compressed mode state. According to the disclosure, the problem that the execution state of the compressed mode of the terminal and a network side cannot be synchronized is solved, normal operation of the compressed mode of the terminal is guaranteed, and the service quality of the terminal and the performance of the system are improved.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: February 24, 2015
    Assignee: ZTE Corporation
    Inventors: Lin Liu, Xiang Cheng, Yazhu Ke
  • Patent number: 8953581
    Abstract: A system for synchronizing nodes in a wireless network comprises a first node and a second node. The first node comprising a transmitter, a receiver, and a first time keeper. The second node comprising a transmitter, a receiver, a second time keeper, a timing error measurer for making a timing error measurement between the first time keeper and the second time keeper. The second timekeeper is adjusted to target minimizing the timing error measurement.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: February 10, 2015
    Assignee: Dust Networks, Inc.
    Inventors: Gordon Alexander Charles, Lance Robert Doherty, Thor Nelson Juneau, Mark Alan Lemkin, Jonathan Simon, Zhenqiang Ye
  • Patent number: 8923344
    Abstract: The present invention is a system and method for enabling multicast synchronization of initially unicasted content. Multiple unicast streams are synchronized in order to convert the unicast streams into a multicast stream. Each unicast stream may be accelerated or slowed down in relation to a reference stream to a common point within each stream upon which the unicast streams are replaced by a multicast stream of the same content.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: December 30, 2014
    Assignee: AT&T Intellectual Property II, L.P.
    Inventor: Lee Begeja
  • Publication number: 20140362872
    Abstract: The embodiments herein relate to a method in a communications network comprising a communications link connecting a first device to a second device. The communications link comprises an upper layer having a variable delay and a lower layer having a constant delay. The first device comprises a first clock and the second device comprises a second clock. The communications network synchronizes the first clock via the lower layer of the communications link with the second clock. The communications network determines, at the second device, a residence time for a first message when transmitted from the first device to the second device via the upper layer of the communications link.
    Type: Application
    Filed: February 7, 2012
    Publication date: December 11, 2014
    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Hakan Grenabo, Per-Arne Thorsen
  • Patent number: 8897408
    Abstract: A method for operating an automation system with a plurality of communication users linked for communication purposes via a serial connection, of which at least one functions as sender and at least one as a receiver, includes determining at a sender an offset value between an occurrence of a synchronous signal and a communication clock cycle, transmitting the determined offset value in a data transmission to the at least one receiver, waiting at the at least one receiver until a time period commensurate with the offset value has elapsed, and generating at the at least one receiver an output signal after the time period has elapsed.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: November 25, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventor: Peter Jänicke
  • Patent number: 8891380
    Abstract: Systems and methods for synchronizing filter records between a mobile device and a network node are described herein. Upon detection of a precedence contention when installing filters at the network node, a synchronization command can be initiated to synchronize the filter records between the mobile device and the network node.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: November 18, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Shrawan K. Khatri, Ajith T. Payyappilly
  • Patent number: 8867434
    Abstract: A network terminal has communication section that communicates with other network terminals connected via a network, time-series data creation section that, at timing set beforehand, creates time information including a correspondence between an identification number of the own network terminal and a current time measured by a timer of the own network terminal and creates time-series data registering the time information, and additional registration section that, when the communication section receives the time-series data transmitted from another network terminal, creates time information including a correspondence between the identification number of the own network terminal and a current time measured by the timer of the own network terminal and additionally registers the time information to the time-series data received this time.
    Type: Grant
    Filed: April 5, 2010
    Date of Patent: October 21, 2014
    Assignees: OMRON Corporation, The University of Tokyo
    Inventors: Takeshi Naito, Shunsuke Kamijo, Kaichi Fujimura
  • Publication number: 20140269765
    Abstract: A system and associated methods are disclosed for routing communications amongst computing units in a distributed computing system. In a preferred embodiment, processors engaged in a distributed computing task transmit results of portions of the computing task via a tree of network switches. Data transmissions comprising computational results from the processors are aggregated and sent to other processors via a broadcast medium. Processors receive information regarding when they should receive data from the broadcast medium and activate receivers accordingly. Results from other processors are then used in computation of further results.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 18, 2014
    Applicant: COGNITIVE ELECTRONICS, INC.
    Inventor: Andrew C. FELCH
  • Patent number: 8837530
    Abstract: A system and method are provided for adaptive synchronization of timing information provided in communications messages transmitted between independently clocked communication nodes of a wireless communications network. The system and method include measures for collecting timestamps of messages generated by a plurality of the nodes, each timestamp being generated by one of the nodes relative to a local time reference thereof. A pairwise clock error is computed for at least one pair of nodes based upon a plurality of network messages passed therebetween. A global time reference is adaptively established for the timestamps responsive to the pairwise clock error. A plurality of mapping factors are defined each for translating from one local time reference to the global time reference. The mapping factors are selectively applied to corresponding ones of the timestamps.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: September 16, 2014
    Assignee: University of Maryland
    Inventors: Ashok K. Agrawala, Matthew Mah
  • Patent number: 8804037
    Abstract: Systems, methods, and processor readable media are disclosed for encoding and transmitting first media content and second media content using a digital radio broadcast system, such that the second media content can be rendered in synchronization with the first media content by a digital radio broadcast receiver. The disclosed systems, methods, and processor-readable media determine when a receiver will render audio and data content that is transmitted at a given time by the digital radio broadcast transmitter, and adjust the media content accordingly to provide synchronized rendering. In exemplary embodiments, these adjustments can be provided by: 1) inserting timing instructions specifying playback time in the secondary content based on calculated delays; or 2) controlling the timing of sending the primary or secondary content to the transmitter so that it will be rendered in synchronization by the receiver.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: August 12, 2014
    Assignee: iBiquity Digital Corporation
    Inventors: Steven Andrew Johnson, Muthu Gopal Balasubramanian, Harvey Chalmers, Jeffrey Ranken Detweiler, Albert Gambardella, Russell Iannuzzelli, Stephen Douglas Mattson
  • Publication number: 20140198810
    Abstract: A method of aligning clock signals in multiple transceiver channels on an integrated circuit may include adjusting a slave clock signal at a slave transceiver channel based on a master clock signal received from a master transceiver channel. A clock generation circuit and/or a delay circuit in the slave transceiver channel may be used to adjust the slave clock signal to produce an intermediate slave clock signal. The master clock signal may be adjusted based on the intermediate slave clock signal received at the master transceiver channel to obtain a total adjustment value. The phase of the intermediate slave clock signal may further be adjusted at the slave transceiver channel based on the total adjustment made at the master transceiver channel.
    Type: Application
    Filed: January 16, 2013
    Publication date: July 17, 2014
    Applicant: Altera Corporation
    Inventor: Altera Corporation
  • 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: 8774231
    Abstract: Systems and methods for addressing the de-synchronization of the cryptosync between the network and the mobile stations (eNB) that can occur at mobility are addressed. De-synchronization is resolved by forwarding HFN and PDCP Sequence Number(s) from the source eNB to the target eNB. In order to avoid re-use of a cryptosync for a given key, a backward offset from the initial COUNT value is used by the target eNB. These approaches do not require an over-the-air signaling and the COUNT value handling in the network is transparent to the mobile station.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: July 8, 2014
    Assignee: Qualcomm Incorporated
    Inventors: Masato Kitazoe, Sai Yiu Duncan Ho
  • Patent number: 8774229
    Abstract: A wireless broadcast system that collects content for distribution over a wireless communication network. The content stream is encapsulated into a stream of transport packets for broadcast over the wireless communication link. The stream of transport packets are simultaneously broadcast as part of an identical signal from a plurality of synchronized transmitters in a single frequency network. A receiver acquires the broadcast signal and synchronizes to the signal. Once the receiver is synchronized to one of the transmitters in the single frequency network, the receiver can receive signals from any, or multiple, of the transmitters in the network without re-synchronizing.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: July 8, 2014
    Assignee: WI-LAN, Inc.
    Inventors: Dennis P. Connors, Brian D. Petry, Gene W. Marsh, Srikanth Gummadi, Keerthi S. Govind, William S. Burchill, Seema Madan
  • Patent number: 8731003
    Abstract: An arrangement for adjusting a clock signal in a network element of a communications network includes a processor device arranged to produce a control variable containing information about synchronization messages received from at least two other network elements. A situation in which the reception from a sending network element of synchronization messages of a good enough quality ceases will not significantly disturb the clock signal to be adjusted because only part of the control variable used for the adjustment depends on synchronization messages sent by an individual network element. In a preferred arrangement, the reference value of the control variable is changed in response to a situation where the reception from a sending network element of synchronization messages of a good enough quality ceases. Thus it is possible to reduce the change of the difference between the control variable and its reference value which further reduces disturbances caused in the clock signal to be adjusted.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: May 20, 2014
    Assignee: Tellabs Oy
    Inventors: Heikki Laamanen, Markus Hurme, Kenneth Hann, Jonas Lundqvist
  • Patent number: 8730868
    Abstract: In order to select a synchronization signal higher in accuracy, thereby increasing the accuracy of the time synchronization, it is provided a network node for transferring data in a network, comprising: a network interface having a plurality of ports; a transfer control module; a time synchronizing module; a fluctuation measurement module; and a clock. The time synchronization module uses a received time synchronization packet to synchronize the clock. The fluctuation measurement module determines an accuracy of a time contained in the received time synchronization packet based on a result of comparison between the time contained in the received time synchronization packet and a time of the clock.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: May 20, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masaki Yamada, Yuji Ogata, Nobuyuki Muranaka
  • Patent number: 8730848
    Abstract: A repeater (1) particularly suitable for a time-division duplex transmission of communication signals is provided. The repeater (1) comprises a master unit (2) for communicating with a base station (3) of a wireless network, at least one remote unit (4) for communicating with a network terminal, as well as a waveguide (11) connecting the remote unit (4) with the master unit (2) for transmitting the communication signals in an uplink direction (6) from the remote unit (4) to the master unit (2) and in a downlink direction (5) from the master unit (2) to the remote unit (4). Both the master unit (2) and the remote unit (4) comprise one switch (19, 20) each for changing over the signal transmission between uplink direction (6) and downlink direction (5).
    Type: Grant
    Filed: March 7, 2009
    Date of Patent: May 20, 2014
    Assignee: Andrew LLC
    Inventors: Peter Schmid, Oliver Braz, Peter Gunzer, Mathias Schmalisch, Joerg Stefanik