Synchronized Stations Patents (Class 455/502)
  • Patent number: 7949298
    Abstract: The present invention provides a teaching material having an identification unit and a teaching-material communication system. The teaching material having the identification unit comprises at least one learning unit and at least one identification unit. The teaching-material communication system comprises at least one transmitting end system and at least one receiving end system. The transmitting end system comprises an input module and a transmission module. The receiving end system comprises a receiving module, a second identification process module, and a second communication module. By the at least one transmitting end system and the at least one receiving end system of the teaching-material communication system, at least one transmitter and at least one receiver can communicate with the learning unit of the teaching material having the identification unit.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: May 24, 2011
    Inventors: Ming Zhong Li, Ming Chang Li
  • Patent number: 7949356
    Abstract: Communicating among stations in a network includes providing repeated beacon transmissions from at least some of the stations including a first station. The first station is assigned to a first level. Any stations that can reliably receive transmissions from the first station are assigned to a second level. Any stations not assigned to any of the preceding levels that can reliably receive transmissions from the preceding level are assigned to each of one or more higher levels. Timing information at each station in a given level is synchronized according to transmissions received from at least one station in the preceding level.
    Type: Grant
    Filed: June 4, 2008
    Date of Patent: May 24, 2011
    Assignee: Atheros Communications, Inc.
    Inventors: Lawrence W. Yonge, III, Srinivas Katar, Manjunath Krishnam
  • Patent number: 7944907
    Abstract: A wireless local area network (WLAN) transceiving integrated circuit services voice communications in a WLAN with at least one other WLAN device. The WLAN transceiving integrated circuit includes a WLAN interface, an input buffer, a transcoder, and a processor. The WLAN interface wirelessly communicates with the at least one WLAN device to receive packetized audio data from the at least one WLAN device. The input buffer operably couples to the WLAN interface and receives the packetized audio data from the WLAN interface. The transcoder converts the packetized audio data to Pulse Code Modulated (PCM) audio data and outputs the PCM audio data to a coupled audio COder/DECoder (CODEC) such that the PCM audio data is substantially temporally aligned with Radio Frequency (RF) slots of the WLAN interface.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: May 17, 2011
    Assignee: Broadcom Corporation
    Inventors: Vivan Chou, Charles Aragones, Sherman Lee
  • Patent number: 7941168
    Abstract: A mobile communication system is configured to control a transmission rate of user data to be transmitted from a mobile station to a radio base station via an uplink transmission rate allocation shared physical control channel, and to transmit user data from the radio base station to the mobile station via a downlink shared physical data channel. Transmission frame timing of the uplink transmission rate allocation shared physical control channel is synchronized with transmission frame timing of the downlink shared physical data channel.
    Type: Grant
    Filed: February 1, 2006
    Date of Patent: May 10, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Anil Umesh, Masafumi Usuda, Takehiro Nakamura
  • Patent number: 7941166
    Abstract: Data is transmitted via time division multiple access methods and every radio cell includes one base station each for the radio coverage of a plurality of mobile stations assigned to the radio cell. The base station receives, in addition to mobile station signals of its own radio cell, mobile station signals of neighboring radio cells and determines, on the basis of the mobile station signals received, a time synchronization value and/or a frequency synchronization value to which the base station synchronizes itself.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: May 10, 2011
    Assignee: Siemens Aktiengesellschaft
    Inventors: Elena Costa, Dirk Galda, Harald Haas, Niclas Meier, Hermann Rohling, Egon Schulz
  • Patent number: 7941173
    Abstract: Improved beacon signaling methods are described. Beacon signals are transmitted on the same tone in at least two consecutive symbol periods facilitating accurate energy measurements over a symbol period even if timing synchronization with the transmitter is not maintained. A low power wideband signal is also combined with the beacon signal to facilitate channel estimation and other operations such as timing synchronization operations.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: May 10, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Rajiv Laroia, Vladimir Parizhsky, Junyi Li, Sathyadev Venkata Uppala
  • Patent number: 7940797
    Abstract: An apparatus and method for transmitting control information in a mobile communication system transmits uplink or downlink control information required for an E-DCH transmission between MAC layers of a transmitting side and a receiving side. The MAC layer of the transmitting side divides the MAC PDU into a MAC control PDU and a MAC data PDU and transmits data through the MAC data PDU and uplink or downlink control information through the MAC control PDU to the receiving side. The MAC control PDU includes an identifier for indicating a type of a MAC PDU and a sub-identifier for discriminating a type of the corresponding MAC control PDU.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: May 10, 2011
    Assignee: LG Electronics Inc.
    Inventors: Young Dae Lee, Seung June Yi, Sung Duck Chun
  • Patent number: 7941167
    Abstract: A system for data communication is disclosed. The system comprises a detection module that ascertains when a mobile wireless communication device is located within a first range of a data source. The system further comprises a data module that automatically sends information to the mobile wireless communication device when the mobile wireless communication device is within the first range. Methods of using the system are also disclosed.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: May 10, 2011
    Assignee: Microsoft Corporation
    Inventors: Jon Xu, Dominique Fortier, Anil Kumar Dhawan
  • Patent number: 7940743
    Abstract: A method and device for synchronizing a transmitter and a receiver with each other over a radio interface. A transmission signal is produced with a signal source in the transmitter and is transmitted via the radio interface. A corresponding receiver signal is received in the receiver from the radio interface and is evaluated using a receiver signal source signal from a signal source of the receiver adapted to the signal source of the transmitter. The same frequency modulation is applied to the receiver signal source signal, whereby the receiver signal received in the receiver is mixed with the receiver signal source signal to form a mixed signal and the mixed signal is analyzed with respect to frequency unbalance.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: May 10, 2011
    Assignee: Symeo GmbH
    Inventors: Claus Seisenberger, Martin Vossiek
  • Patent number: 7933618
    Abstract: Apparatus, and an associated method, for selectably delaying performance of synchronization operations in which database copies are placed in match with one another. A user of a mobile node at which a database copy is maintained selectably actuates an actuator to select delay of performance of the synchronization operations. Once selection is made to delay the performance of the synchronization operations, selection is further made by a delay selector of the delay period prior to which synchronization operations are carried out.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: April 26, 2011
    Assignee: Research In Motion Limited
    Inventor: Catherine Phillips
  • Patent number: 7929983
    Abstract: The present invention is directed to a neighbor cell synchronization method for a mobile communication unit. The method includes selecting a neighbor cell according to a scheduling mechanism; determining a synchronization window according to a communicating mode of the mobile communication unit; and searching or decoding specific logic channels within the synchronization window. The present invention also provides an apparatus for performing the method.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: April 19, 2011
    Assignee: Via Technologies, Inc.
    Inventors: Shuai Yang, Teng Han, Yan Wu, Xiaoming Cheng
  • Patent number: 7929907
    Abstract: A remote satellite modem, in conjunction with a mediation device configuration propagates frames over a cellular backhaul link so as to preserve PRC traceability by receiving a frame based signal, in which the frame based signal conforms to a hub timing signal operable to demarcate frames in the frame based signal, and identifies a start of frame in the received frame based signal, such that the start of frame is independent of the symbol timing of the hub timing signal. In response to the start of frame, the modem generates a timing packet corresponding to a remote timing signal, and forwards the timing packet and the frame based signal, in which the timing packet is for decoding the frame based signal corresponding to the hub timing signal using the remote timing signal.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: April 19, 2011
    Assignee: Comtech EF Data, Inc.
    Inventors: Kevin J. Bruemmer, James M. Van Donsel, Pascal Chamberland
  • Patent number: 7929990
    Abstract: A radio communication terminal includes a detection unit configured to detect a plurality of usable frequencies of a frequency range, in which the radio communication terminal plans to transmit, at least depending on whether or not a power of a first received signal is greater than a first threshold, a selection unit configured to select, when a first frequency band from f0+f1 to f0+f1+?f1 (f1 is a first frequency, and ?f1 is a first bandwidth) and a second frequency band from f0?f1??f1 to f0?f1 are simultaneously usable with respect to a center frequency f0 of a utilizing frequency range including the usable frequencies, the first frequency band and the second frequency band as a pair of utilizing frequency bands, and a transmission unit configured to transmit different signals in the pair of utilizing frequency bands.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: April 19, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tazuko Tomioka, Takeshi Tomizawa, Tomoya Horiguchi
  • Patent number: 7925285
    Abstract: According to the present invention, Bluetooth master device offset information is determined and distributed among the master devices within a Bluetooth network. The system either provides an offset to each master device or determines master device offsets and distributes this information to master devices within the system to allow or efficient hand-offs of a slave between master devices.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: April 12, 2011
    Assignee: Broadcom Corporation
    Inventor: Jyothis Indirabhai
  • Patent number: 7920544
    Abstract: A method and apparatus for generating and use of a position location reference signal that allows a receiver to receive position location signals from relatively weak signal generators when in the presence of a strong signal source. The position location reference signals from multiple sources can be synchronized to occur within a scheduled time slot of a time division multiplexed communication system. During the scheduled time slot, each signal source can configure a transmission that includes a media access control address that corresponds to a value reserved for position location signals. Each signal source also configures the transmission to include a position location reference signal that corresponds to the signal source. The position location signals from each of the signal sources is positioned to occur at a time within the data portion of the scheduled time slot that no neighboring signal source transmits its corresponding position location signal.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: April 5, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Samir S. Soliman, Peter Gaal
  • Patent number: 7920545
    Abstract: A communication apparatus determines a hibernation period on the basis of the amount of an offset in beacon period start timing among multiple beacon groups. The communication apparatus is placed in a hibernation status in accordance with the determined hibernation period. Thus, an offset in beacon period start timing among the beacon groups that would occur while the device is in hibernation can be prevented and the need for merging beacon groups and decrease in data rate during such merging are prevented.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: April 5, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tadashi Eguchi
  • Patent number: 7920881
    Abstract: A method of clock synchronization for a wireless communications system includes receiving a radio frequency (RF) signal at a base station and at a network reference server (NRS). The NRS is also coupled to receive a reference clock signal. A clock offset value is then calculated in response to the RF signal received at the base station, the RF signal received at the NRS, and the reference clock signal. A local clock signal at the base station is then synchronized with the reference clock signal in response to the calculated clock offset value.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: April 5, 2011
    Assignee: 2Wire, Inc.
    Inventor: Scott Fullam
  • Patent number: 7917113
    Abstract: A method for synchronizing measurements in a mobile communication apparatus having a first active radio access means (100) adapted to communicate according to a first radio access technology (RAT) and at least a second passive radio access means (200) adapted to communicate according to a second RAT. A time reference common to the first and the second access means (100) is generated. At least one time schedule is obtained, said schedule indicating at least one time gap wherein the second access means (200) is allowed to be active. The activation time of the schedule is based on the common time reference. An arrangement adapted to generate the common time reference and the time schedule is also disclosed.
    Type: Grant
    Filed: April 5, 2004
    Date of Patent: March 29, 2011
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Torgny Palenius, Johan Hokfelt, Christer Östberg, Jan Wichert, Mikael Nilsson, Richard Ewald, Patrik Olofsson, H{dot over (a)}kan Palm
  • Patent number: 7917163
    Abstract: Techniques for intra-frequency searching in the presence of frequency gaps are disclosed. In one embodiment, a search is scheduled and frequency switches are suppressed during the scheduled search. In another embodiment, a search is scheduled in between anticipated frequency gaps. In yet another embodiment, a timer is deployed, the expiration of which indicates a search is to be scheduled. In yet another embodiment, a timer is deployed, the expiration of which indicates a search is to be scheduled and frequency switches are suppressed during the scheduled search. Various other embodiments are also presented. Benefits include allowing prescribed levels of intra-frequency and inter-frequency search to be performed which allows for improved base station selection and therefore improved performance and system capacity.
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: March 29, 2011
    Assignee: QUALCOMM, Incorporated
    Inventor: Messay Amerga
  • Patent number: 7912470
    Abstract: A method of partitioning resources in a CR wireless communication system and a system supporting the same are provided. A new BS receives radio resource status information from a prior BS using a particular frequency band, and requests resource partitioning to the prior BS using a new uplink subchannel defined for communications between BSs. Resource negotiation messages are exchanged over a channel defined between the two BSs so as to efficiently partition resources between the BSs.
    Type: Grant
    Filed: November 6, 2006
    Date of Patent: March 22, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Pandharipande Ashish, Duck-Dong Hwang, Jae-Myeong Kim, Sang-Jo Yoo, Kyoung-Jin Cho, Jae-Hak Chung
  • Patent number: 7912034
    Abstract: A communication method and system are provided that include providing synchronization information about a co-sited downlink carrier. This information may be transmitted to from a base station to a mobile device. The mobile device may receive this information and perform handover or measurements based on the received synchronization information.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: March 22, 2011
    Assignee: Nokia Corporation
    Inventors: Uwe Schwarz, Peter Muszynski, Harri Holma, Sari Korpela, Jussi Numminen
  • Patent number: 7912164
    Abstract: A system includes first and second wireless nodes having a clock with plural times, a wireless transceiver, and a processor cooperating with the transceiver to transmit and receive packets. The second node transceivers wirelessly communicate with the first or other second node transceivers. The second nodes include a Kalman filter with an output, plural filter gains, and an input representing the difference between: about the time of the clock when a received packet should have ideally been received, and a time when the received packet was actually received as measured by the clock. A circuit provides dynamic adjustment of the filter gains. The Kalman filter output estimates the difference between the time of the receiving node clock and a corresponding one of the times of the transmitting node clock. The second processor cooperates with the Kalman filter output to adjust the times of the receiving node clock.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: March 22, 2011
    Assignee: Eaton Corporation
    Inventors: Brian S. R. Armstrong, Luis R. Pereira, Carlos H. Rentel
  • Patent number: 7912423
    Abstract: A wireless communication system enabling multihop communication while maintaining the system throughput and preventing degradation of the user throughput. In the system, a BS (base station) determines the relaying method (whether an RS performs reproduction relay or nonreproduction relay) of the RS (relaying station) and the MCS of multihop communication according to the reception quality (the line quality among an MS2, the RS, and the BS) of the pilot for nonreproduction relay, the reception quality (the line quality between the RS and the BS) of the pilot 2 for reproduction relay, and the line quality (the line quality between the MS2 and the RS) measured at the RS. The determination result is transmitted as relay information to the RS and to the MS2 (a mobile station (2)) through the RS. The MS2 encodes and modulates the uplink data with the MCS based on the relay information and transmits the data to the RS.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: March 22, 2011
    Assignee: Panasonic Corporation
    Inventors: Tomohiro Imai, Ayako Horiuchi, Akihiko Nishio, Kenichi Kuri, Hiroaki Morino
  • Patent number: 7912493
    Abstract: A transmission power control technique allowing stable and reliable signal transmission in soft handover is disclosed. Each of the base stations involved in soft handover measures an amount of loss of the base station selection signal. When the amount of loss of the base station selection signal exceeds a threshold, the transmission power of the downlink signal is not set to the minimum level but to the normally controlled level. Further, a transmission power update timing of each base station is determined so that the downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: March 22, 2011
    Assignee: NEC Corporation
    Inventor: Hiroshi Furukawa
  • Patent number: 7912425
    Abstract: A method of receiving the uplink region allocation information is disclosed. In a broadband wireless access system, in which a mobile terminal receives uplink region allocation information, the present invention includes the steps of receiving an uplink map message from which an uplink map information element (UL-MAP IE) for a ranging region or an uplink bandwidth request region is omitted from a base station and receiving information for a region for a ranging region or uplink bandwidth request using a message periodically transmitted for a control information transmission for an uplink channel. By transmitting uplink region allocation information via a periodically transmitted message, the uplink region allocation information can be efficiently transmitted.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: March 22, 2011
    Assignee: LG Electronics Inc.
    Inventors: Bin Chul Ihm, Ki Seon Ryu
  • Publication number: 20110065465
    Abstract: To control precoding of a terminal in a serving base station, a first codeword that maximizes transmission power of the serving base station is determined by a codebook, and an index of a second codeword that minimizes interference to the neighboring base station is transmitted from the neighboring base station. The serving base station transmits an index of the first codeword, an index of the second codeword, and a combination ratio of a precoding matrix corresponding to the index of the first codeword and a precoding matrix corresponding to the index of the second codeword to the terminal.
    Type: Application
    Filed: May 25, 2010
    Publication date: March 17, 2011
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Jihyung KIM, Wooram Shin
  • Patent number: 7907901
    Abstract: A method and apparatus to provide easier pairing based on motion data is described. The method of pairing two devices comprises receiving a signal to enter into pairing mode, and detecting a motion indicating a pairing. The method further comprises establishing a secure connection with another device for pairing, the secure connection established based on the motion, and exchanging data for pairing.
    Type: Grant
    Filed: September 13, 2007
    Date of Patent: March 15, 2011
    Assignee: DP Technologies, Inc.
    Inventors: Philippe Kahn, Arthur Kinsolving, David Vogel
  • Patent number: 7899027
    Abstract: Methods, apparatuses and systems directed to routing configuration in a hierarchical wireless mesh network. In one implementation, the present invention uses neighbor messages to allow routing nodes to discover one another and configure a hierarchical routing configuration. In one implementation, the present invention provides a neighbor and adjacency protocol that provides for automatic mesh configuration and loop-free mesh topologies.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: March 1, 2011
    Assignee: Cisco Technology, Inc.
    Inventors: Neal Dante Castagnoli, Robert J. Friday
  • Patent number: 7894862
    Abstract: A data transceiver and a data reception method for reducing power consumption in a mobile communication system are provided. The data transceiver includes a transmitter which transmits a plurality of data frames during a predetermined transmission period; and a receiver which receives data frames in the predetermined transmission period, if the transmission period is allowed and monitors with minimal operation power whether data transmission is in progress or completed in the transmission period, if the transmission period is not allowed.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: February 22, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyo-Sun Hwang, Jong-Ae Park, Dong-Jun Lee, Jung-Hoon Suh, Kyung-Hun Jang, Young-Soo Kim
  • Patent number: 7885250
    Abstract: A method and apparatus for synchronizing timing of Access Points (APs) and/or Synchronization Units (SUs) includes (a) arranging a cable having at least four pairs of twisted wires connected between two or more fixed APs and/or SUs in a network; (b) assigning a first pair of the twisted wires to carry a positive D.C. voltage to at least one AP or SU; (C) assigning a second pair of the twisted wires to carry a negative D.C. voltage to at least one AP or SU; (d) providing to the first and second pairs of rails a series of synchronization pulses generated from a synchronization source and capacitively-coupled to the first and second pairs of twisted wires so as to supply a composite signal; and (e) reconstructing the generated synchronization pulses by detecting pulses on the positive and negative D.C. voltages at a receiving end by at least one AP or SU.
    Type: Grant
    Filed: February 3, 2005
    Date of Patent: February 8, 2011
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Tim Whittaker
  • Patent number: 7885243
    Abstract: A design and proof of concept of a new type of WLAN, complete with simulation and results from the simulation has been described. Each AP Node is implemented as a self-contained embedded OS unit, with all algorithms resident in its Operating system. The normal day-to-day functioning of the AP node is based entirely on resident control algorithms. Upgrades are possible through a simple secure communications interface supported by the OS kernel for each AP node.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: February 8, 2011
    Assignee: Mesh Dynamics, Inc.
    Inventors: Francis da Costa, Sriram Dayanandan
  • Patent number: 7885671
    Abstract: A system and method for state synchronization between a base station and a mobile station in a mobile communication system. A count value indicative of a state change of the base station is received. The received current count value is compared with a previous count value previously received and stored. If the current count value is different from the previous count value, the mobile station performs a network entry procedure with the base station.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: February 8, 2011
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Yeong-Moon Son, Hong-Sung Chang, Pan-Yuh Joo, Jung-Je Son, Jae-Weon Cho, Mi-Hyun Lee, Hyun-Jeong Kang, Song-Nam Hong, Sung-Jin Lee, Hyoung-Kyu Lim, Young-Ho Kim
  • Publication number: 20110028171
    Abstract: A method for optimizing a radio resource control procedure in a wireless communication system is disclosed. The wireless communication system supports Coordinated multi-point (CoMP) transmission/reception, which enables a plurality of cells cooperating and providing services for a user equipment (UE). The method includes defining cells directly or indirectly participating in transmission to the UE within the plurality of cells as members of a CoMP cooperating set, and setting the cells of the CoMP cooperating set to use a same system frame number.
    Type: Application
    Filed: August 2, 2010
    Publication date: February 3, 2011
    Inventors: Yu-Hsuan Guo, Sam Shiaw-Shiang Jiang
  • Patent number: 7881345
    Abstract: Symbol timing synchronization in OFDM communication systems where multiple wireless terminals communicate with a single base station is described. Base station transmitter and receiver symbol timing is fixed. Each wireless terminal operates to independently adjust its transmitter timing. Transmitter timing synchronization at the wireless terminal is slaved to the terminal's receiver timing synchronization. Each wireless terminal first corrects its receiver symbol timing based on a signal received from the base station. The wireless terminal then adjusts its transmitter symbol timing as a function of its receiver symbol timing. When the receiver symbol timing is to be advanced or delayed by some amount, the transmitter symbol timing is also advanced or delayed, respectively, by the same, or substantially the same, amount. Symbol timing adjustment can be made by adding or deleting digital samples from the first or last symbol in a dwell.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: February 1, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Rajiv Laroia, Junyi Li, Vladimir Parizhsky
  • Patent number: 7881684
    Abstract: In a system for measuring a time difference of arrival of signals for positioning, an accurate time difference is measured by a receiver which is reduced in power consumption, size, and cost. The system comprises a node (under measurement) for transmitting a positioning signal, a reference station for transmitting a reference signal, and a plurality of access points for receiving the positioning signal and reference signal, and a server connected to the plurality of access points through a network. Each of the plurality of access points measures a time difference between the reception of the positioning signal and the reception of the reference signal, and a frequency deviation from the reference station, using a clock signal and a signal for shifting the clock signal, and the server calculates the position of the node based on the measured time difference and frequency deviation.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: February 1, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuo Nakagawa, Masayuki Miyazaki, Kenichi Mizugaki, Ryosuke Fujiwara
  • Patent number: 7881663
    Abstract: Provided are a beacon signal generating apparatus and a phase synchronizing apparatus using the same for establishing a phase synchronization while tracking a phase variation of a Timing Source Oscillator (TSO) of a satellite using a simpler scheme at an earth station, in making a phase synchronization between a clock signal of an On board Switch (OBS) embedded in the satellite and that of the earth station in a Satellite Switched Time Division Multiple Access (SS-TDMA) satellite communication system. The inventive beacon signal generating apparatus embedded in a satellite comprises a frequency oscillator for creating a TSO frequency, a beacon signal generator for multiplying the TSO frequency to be matched with a beacon signal frequency to generate a beacon signal synchronized with the TSO frequency, and a transmitter for transmitting the beacon signal to each of earth stations to recovery a frequency synchronized with the TSO frequency.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: February 1, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jin-Ho Jo, Seong-Pal Lee
  • Patent number: 7877059
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: January 25, 2011
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 7876741
    Abstract: Disclosed herein is a method of acquiring Uplink (UL) synchronization for a mobile WiMax system analyzer. When a DL sub-frame is received, the method is performed on a Portable Subscriber Station (PSS) having a test mode function of creating a UL sub-frame through the mobile WiMax system analyzer having signal generating means configured to store the CID information in advance and signal analyzing means configured to receive and analyze the DL sub-frame. The method includes step (a) of the signal generating means continuously D/A converting, RF-modulating and outputting the DL sub-frame, step (b) of the signal analyzing means receiving the UL sub-frame, step (c) of the signal analyzing means continuously demodulating, A/D-converting and capturing the modulated UL sub-frame, and step (d) of the signal analyzing means acquiring UL synchronization by comparing the UL sub-frame with the data captured at step (c) using a time correlation technique.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: January 25, 2011
    Assignee: Innowireless Co., Ltd.
    Inventors: Jinsoup Joung, Kyeongmin Ha, Junwan Park, Cheoljin Lee
  • Patent number: 7877104
    Abstract: The present invention discloses a method and system for monitoring a wireless network clock compared to an absolute time scale using the user mobile stations themselves. The major advantage is the capability to transfer GPS time to a Mobile Station in a wireless network, and thus to decrease the time necessary for the mobile receiver to perform position calculations, with minimal additional hardware required by the network.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: January 25, 2011
    Assignee: SiRF Technology Inc.
    Inventors: Gregory B. Turetzky, Lionel J. Garin
  • Patent number: 7876740
    Abstract: A method and system for synchronization of link layer windows in a wireless communications system is disclosed. At a transmitter in the wireless communications system, the transmitter transmits a plurality of frames in a transmitter's link layer window, wherein each frame comprises segments and sends a request for an acknowledgement of the plurality of frames to a receiver. Then the transmitter determines a last transmitted segment of an eldest frame of the plurality of frames in the transmitter's link layer window, if a response to the request is not received within a specified time period and sets a synchronization indicator in the determined last transmitted segment of the eldest frame. Finally, the transmitter transmits the determined last transmitted segment of the eldest frame with the synchronization indicator set to the receiver.
    Type: Grant
    Filed: August 4, 2005
    Date of Patent: January 25, 2011
    Assignee: Motorola, Inc.
    Inventors: James E. Eastwood, Jeff S. Anderson, Roberto A. Perez
  • Patent number: 7876738
    Abstract: In order to prevent an incorrect synchronization between a received code-modulated signal and an available replica code, partial correlations are performed between a respective subset of samples of the replica code and samples of the received code-modulated signal associated to the respective subset of samples of the replica code at a specific alignment between the received code-modulated signal and the replica code. The results of the partial correlations are then compared to each other, and it may be decided based on this comparison whether the replica code corresponds to a code employed for code-modulating the received code-modulated signal.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: January 25, 2011
    Assignee: Nokia Corporation
    Inventors: David Akopian, Harri Valio
  • Patent number: 7877105
    Abstract: In a method for synchronizing a mobile station with the base station in a mobile communication system, a reference-frequency oscillator is re-adjusted. To enable an inexpensive reference-frequency oscillator of simple construction to be used, the frequency variations resulting from a change in the temperature of the mobile station and a change in its location are determined and/or predicted separately. When the frequency variations are large, the mobile station is synchronized with the base station more frequently than when they are small.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: January 25, 2011
    Assignee: ST-Ericcson SA
    Inventors: Markus Neumann, Wolfgang Wippich
  • Patent number: 7877106
    Abstract: Systems and methods are provided for delivering both PMP communications, for example standard cellular communications via a base station, and also delivering P2P communications, for example, communications between two mobile stations, using the same spectral resources for both types of communication.
    Type: Grant
    Filed: May 13, 2009
    Date of Patent: January 25, 2011
    Assignee: Nortel Networks Limited
    Inventors: Shalini Periyalwar, Hang Zhang, Nimal Senarath, Derek Yu, Kelvin Kar-Kin Au, Karl Mann
  • Patent number: 7873316
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: January 18, 2011
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 7869423
    Abstract: A system and method for accommodating mobile station synchronization to neighbor cells in a mobile communication system. At least one available frame is utilized as a search window in an uplink data transfer multiframe for receiving neighboring cell synchronization information. At least one transmit time slot in a frame adjacent to the available frame in the uplink data transfer multiframe is surrendered to extend the search window. The neighboring cell synchronization information may then be contiguously received via the extended search window.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: January 11, 2011
    Assignee: Nokia Corporation
    Inventors: Jari J. Ruohonen, Tommy Bysted, Vesa Savela
  • Patent number: 7865139
    Abstract: A system and method for relaying signals from a magneto-inductive system, which are normally used to communicate between magneto-inductive units using quasi-static magnetic fields, over a voice-band communication system. The magneto-inductive signals are modulated data signals having a carrier frequency typically between 300 Hz and 3 kHz. The voice-band communication system facilitates long distance communication of voice-band signals. By supplying the signals from one magneto-inductive unit to the voice-band communication system through an analog input port, the signals are transmitted through the voice-band communication system. They are output from the system through an analog audio output port to the other magneto-inductive unit.
    Type: Grant
    Filed: March 16, 2007
    Date of Patent: January 4, 2011
    Assignee: Magneto-Inductive Systems Limited
    Inventors: Don F. Dinn, Craig Hillis
  • Patent number: 7860132
    Abstract: A method of processing data comprises the receiving a frame of data having a predetermined number of time slots (502,504,506). Each time slot comprises a respective plurality of data symbols (520). The method further comprises a primary (508), a secondary (510) and a tertiary (512) synchronization code in each said predetermined number of time slots.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: December 28, 2010
    Assignee: Texas Instruments Incorporated
    Inventor: Sundararajan Sriram
  • Patent number: 7856008
    Abstract: The embodiments of the present invention provide a mechanism to synchronize centralized networks. Each centralized network includes a central coordinator controlling and managing network activities. The embodiments provide a way of allocating beacon slots, such that one of the beacon slots is synchronized to the alternating current line cycle and thus functions as a master timing sequence. In some embodiments, methods, devices, and systems are provided for detecting transmissions of non-coordinating networks.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: December 21, 2010
    Assignee: Sharp Laboratories of America, Inc.
    Inventors: Deepak V. Ayyagari, Wai-Chung Chan, Sherman L. Gavette, Lawrence W. Yonge, III, Yiorgos Peponides, Neal Riedel
  • Patent number: 7856002
    Abstract: A system and method for wireless communication having a device coordinator selection capability are disclosed. In one aspect, the method comprises determining a coordinator priority of each device based on a static priority table, the table assigning a priority to each type of devices. The method further comprises selecting a first device among the plurality of devices as the coordinator based at least in part on the coordinator priority of each device, and a coordinator candidate from the plurality of devices except the current coordinator, based on the coordinator priority of each device and probing results.
    Type: Grant
    Filed: May 10, 2007
    Date of Patent: December 21, 2010
    Assignee: Samsung Electronic Co., Ltd.
    Inventors: Xiangping Qin, Harkirat Singh, Huai-Rong Shao, Chiu Ngo
  • Patent number: 7853206
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: December 14, 2010
    Assignee: WFS Technologies, Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland