Patents by Inventor Yuantao Zhang

Yuantao Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9014120
    Abstract: A method of resource allocation, system and transmitter that the method includes scheduling a plurality of receivers by a transmitter according to requests for transmitting uplink data sent by the plurality of receivers, determining, respectively for each of the plurality of receivers, the uplink shared transmission channel resources, the used mapping relation of resources and the final cyclic shift n(DM_RS) for indicating an uplink feedback channel, according to the result of scheduling, a predefined mapping relation of resources, a spare mapping relation of resources and the n(DM_RS) and notifying the plurality of receivers by the transmitter of the determined uplink shared transmission channel resources of the plurality of receivers, the used mapping relation of resources and the final n(DM_RS).
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: April 21, 2015
    Assignee: Fujitsu Limited
    Inventors: Yuanrong Lan, Yi Wang, Yuantao Zhang, Hua Zhou, Jianming Wu
  • Publication number: 20150085808
    Abstract: A carrier aggregation system, includes transmitting a first signaling to configure one additional carrier to a user equipment (UE) at which the additional carriers are deactivated, to configure a timer to each additional carrier for the UE by which the carrier is deactivated after the corresponding timer expiry; transmitting a second signaling that carries an activation indication to the UE to activate one deactivated additional carrier in the configured carriers for the UE; activating at least one deactivated additional carrier, starting the timer, controlling the UE to start Physical Downlink Control Channel (PDCCH) monitoring and Physical Downlink Shared Channel (PDSCH) receiving on the activated additional carrier; transmitting PDCCH on the activated additional carrier for the UE, by which the corresponding timer being restarted; deactivating the activated carrier after the corresponding timer expiry, controlling the UE to stop the PDCCH monitoring and the PDSCH receiving on the deactivated additional car
    Type: Application
    Filed: December 1, 2014
    Publication date: March 26, 2015
    Applicant: FUJITSU LIMITED
    Inventors: Haibo XU, Yuantao ZHANG, Hua ZHOU, Jianming WU, Yoshiaki OHTA
  • Patent number: 8971382
    Abstract: A code generating apparatus, demodulation reference signal generating apparatus, and methods thereof. The demodulation reference signal generator includes generating a non-correlation sequence for RS of a first resource block; spreading spectrums of elements in the non-correlation sequence for RS to be mapped to a first frequency resource of the first resource block, by using a first group of codes; second spreading spectrums of elements in the non-correlation sequence for RS to be mapped to a second frequency resource of the first resource block, by using a second group of Codes; the first and second frequency resources are adjacent frequency resources in frequency resource elements used for RS transmission in the first resource block, and the first and second groups of Codes are mirrors in column to each other; and mapping the spectrum-spread elements to the first and second frequency resources, respectively.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: March 3, 2015
    Assignee: Fujitsu Limited
    Inventors: Yi Wang, Yuantao Zhang, Hua Zhou, Jianming Wu
  • Patent number: 8971266
    Abstract: A method and an apparatus for conveying downlink scheduling signaling. The method comprises: generating a plurality of masking sequences corresponding to a plurality of predetermined downlink scheduling information including downlink physical resource assignment indicating information or power assignment information for a Demodulation Reference Signal (DMRS); and selecting a corresponding masking sequence from the plurality of masking sequences based on downlink scheduling information to be notified to a User Equipment (UE), and masking a Cyclic Redundancy Check (CRC) of a corresponding downlink control channel of the user equipment with the selected masking sequence for transmission.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: March 3, 2015
    Assignee: Fujitsu Limited
    Inventors: Yi Wang, Yuantao Zhang, Jie Zhang, Jianming Wu, Hua Zhou
  • Patent number: 8937895
    Abstract: A method and device for carrier management in a carrier aggregation system, includes signaling which carries an additional carrier measurement indication sent to a User Equipment (UE); a measurement report received from the UE; when the downlink traffic of the UE increases, if the recorded carriers in the current downlink carrier set of the UE can not meet the requirement of the downlink traffic data rate, according to the additional carrier measurement report, at least one additional carrier is configured and activated, and the UE is notified to perform the corresponding configuration operation. In addition, according to the measurement result and the change in the downlink traffic of the UE, the base station can also perform the deactivation, activation replacement and removal of the additional carrier for the user, and notify the UE to perform the corresponding configuration operations.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: January 20, 2015
    Assignee: Fujitsu Limited
    Inventors: Haibo Xu, Yuantao Zhang, Hua Zhou, Jianming Wu, Yoshiaki Ohta
  • Patent number: 8897272
    Abstract: A method for Channel State Information (CSI) feedback in a wireless communication system includes: determining parameters required for the CSI feedback in a first wireless communication system, so that a feedback structure of the first wireless communication system in Physical Uplink Control Channel (PUCCH) is based on a feedback structure of a second wireless communication system in the PUCCH; notifying the parameters to a user equipment; transmitting a Channel State Information Reference Symbol (CSI-RS) to the user equipment periodically, so that the user equipment calculates the CSI required to be fed back; and receiving the CSI fed back by the user equipment according to the feedback structure of the first wireless communication system in the PUCCH in response to the CSI-RS, wherein information fed back for each BP is information obtained by jointly encoding optimum subband Channel Quality Information (CQI) with optimum subband Pre-encoding Matrix Information (PMI) in the BP.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: November 25, 2014
    Assignee: Fujitsu Limited
    Inventors: Yuantao Zhang, Yuanrong Lan, Yi Zhang, Hua Zhou, Jianming Wu
  • Publication number: 20140334333
    Abstract: A method and apparatus for determining a downlink coordinated multipoint measurement set. The method includes: receiving reference signal receiving power of a channel state information reference signal transmitted by each point in an RRM measurement set reported by UE; wherein the reference signal receiving power of each point in the RRM measurement set is measured by the UE based on more than one groups of preconfigured channel state information reference signal resources; and determining the downlink coordinated multipoint measurement set according to the reference signal receiving power reported by the UE. With the method, the UE needs not to measure RSRP of all the points for transmitting signals, thereby avoiding waste of resources, and solving problems in the prior art.
    Type: Application
    Filed: July 29, 2014
    Publication date: November 13, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yueqiao XU, Yuantao ZHANG, Yi WANG, Hua ZHOU
  • Publication number: 20140307680
    Abstract: Embodiments of the present application provide a method for linkage resource assignment, UE, a method for multiplexing transmission and an eNB. The method for linkage resource assignment includes: acquiring, by UE, a lowest PRB index assigned to a PUSCH, cyclic shift information of an uplink DM-RS, and an initial position of a physical resource occupied by uplink grant signaling; and calculating group identification and sequence identification of a PHICH or an ePHICH, according to the lowest PRB index of the PUSCH, the cyclic shift information of the uplink DM-RS, and the initial position of physical resource occupied by uplink grant signaling, so as to determine whether the PHICH or the ePHICH is assigned to the UE. With the embodiments of the present application, a collision of a PHICH or an ePHICH may be reduced.
    Type: Application
    Filed: June 26, 2014
    Publication date: October 16, 2014
    Inventors: Jian ZHANG, Yuantao ZHANG, Yi ZHANG, Yi WANG, Hua ZHOU
  • Publication number: 20140301358
    Abstract: A code generating apparatus, demodulation reference signal generating apparatus, and methods thereof. The demodulation reference signal generator includes generating a non-correlation sequence for RS of a first resource block; spreading spectrums of elements in the non-correlation sequence for RS to be mapped to a first frequency resource of the first resource block, by using a first group of codes; second spreading spectrums of elements in the non-correlation sequence for RS to be mapped to a second frequency resource of the first resource block, by using a second group of Codes; the first and second frequency resources are adjacent frequency resources in frequency resource elements used for RS transmission in the first resource block, and the first and second groups of Codes are mirrors in column to each other; and mapping the spectrum-spread elements to the first and second frequency resources, respectively.
    Type: Application
    Filed: June 19, 2014
    Publication date: October 9, 2014
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU, Jianming WU
  • Publication number: 20140301430
    Abstract: A code generating apparatus, demodulation reference signal generating apparatus, and methods thereof. The demodulation reference signal generator includes generating a non-correlation sequence for RS of a first resource block; spreading spectrums of elements in the non-correlation sequence for RS to be mapped to a first frequency resource of the first resource block, by using a first group of codes; second spreading spectrums of elements in the non-correlation sequence for RS to be mapped to a second frequency resource of the first resource block, by using a second group of Codes; the first and second frequency resources are adjacent frequency resources in frequency resource elements used for RS transmission in the first resource block, and the first and second groups of Codes are mirrors in column to each other; and mapping the spectrum-spread elements to the first and second frequency resources, respectively.
    Type: Application
    Filed: June 19, 2014
    Publication date: October 9, 2014
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU, Jianming WU
  • Publication number: 20140293924
    Abstract: Embodiments of the present invention provide a mapping method and apparatus for a search space of a physical downlink control channel. The method includes: determining a search space allocated to the PDCCH according to a resource allocation scheme; and mapping each of candidates of the PDCCH to a logic time frequency resource of the search space according to a predefined interval. With the method and apparatus of the embodiments of the present invention, a frequency selective scheduling gain is obtained by mapping different candidates onto discrete time frequency resources, or a frequency diversity gain is obtained by mapping one candidate onto discrete time frequency resources, thereby improving the performance of the PDCCH.
    Type: Application
    Filed: June 13, 2014
    Publication date: October 2, 2014
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU
  • Publication number: 20140247808
    Abstract: A method and apparatus for enhancing synchronization in a heterogeneous network, including transmitting an auxiliary synchronization signal by a base station in a pico cell, a transmission interval of the auxiliary synchronization signal being 10 ms or 5 ms, and the auxiliary synchronization signal being located in a 0th subframe and/or a 5th subframe of each transmission frame; and notifying by the base station to user equipment in a cell range extension (CRE) region to detect the auxiliary synchronization signal, so that the user equipment performs symbol synchronization and frame synchronization in accordance with the auxiliary synchronization signal in accessing to the pico cell, and high-layer signaling indication and a auxiliary synchronization signal are combined, user equipment in a CRE region of the pico cell may obtain synchronization, thereby not only ensuring compatibility but also satisfying requirements of the system performance with a relatively low time frequency resource overhead.
    Type: Application
    Filed: May 16, 2014
    Publication date: September 4, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi ZHANG, Yuantao ZHANG, Hongchao LI, Yi WANG, Hua ZHOU
  • Patent number: 8817631
    Abstract: A contention-based uplink data transmission method, apparatus and system are provided. The method may include that: a main control node in a communication system receives data transmitted via uplink contention transmission resources, and decodes the data, wherein the uplink contention transmission resources are uplink transmission resources which the main control node allocates to a plurality of terminal nodes in the communication system and via which the plurality of terminal nodes transmits data in a contention-based way; and the main control node sends reception status information to each terminal node transmitting the data via the uplink contention transmission resources, wherein the reception status information reflects whether the data transmitted from each terminal node has been decoded successfully.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: August 26, 2014
    Assignee: Fujitsu Limited
    Inventors: Haibo Xu, Yuantao Zhang, Hua Zhou, Jianming Wu, Yoshiaki Ohta
  • Publication number: 20140226554
    Abstract: Embodiments of the present invention provide methods for calculating and feeding back channel quality information and apparatus. The method for calculating includes: calculating, by a terminal, channel quality information (CQI) of a non-backward compatible carrier, according to usable PDSCH resources in the non-backward compatible carrier; wherein resources occupied by a downlink control channel are not assumed into the usable PDSCH resources in the non-backward compatible carrier, the number of the resources occupied by the downlink control channel being less than the number of usable resources configured by a base station for a downlink control channel in a backward compatible carrier. With the methods and apparatus provided by embodiments of the present invention, calculation of corresponding CQI varies along with a change of a usable PDSCH physical resource, so as to avoid degradation of accuracy of CQI calculation due to a load change, thereby improving the performance of the system.
    Type: Application
    Filed: April 16, 2014
    Publication date: August 14, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU, Yi ZHANG
  • Patent number: 8798115
    Abstract: A code generating apparatus, demodulation reference signal generating apparatus, and methods thereof. The demodulation reference signal generator includes generating a non-correlation sequence for RS of a first resource block; spreading spectrums of elements in the non-correlation sequence for RS to be mapped to a first frequency resource of the first resource block, by using a first group of codes; second spreading spectrums of elements in the non-correlation sequence for RS to be mapped to a second frequency resource of the first resource block, by using a second group of Codes; the first and second frequency resources are adjacent frequency resources in frequency resource elements used for RS transmission in the first resource block, and the first and second groups of Codes are mirrors in column to each other; and mapping the spectrum-spread elements to the first and second frequency resources, respectively.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: August 5, 2014
    Assignee: Fujitsu Limited
    Inventors: Yi Wang, Yuantao Zhang, Hua Zhou, Jianming Wu
  • Publication number: 20140211712
    Abstract: A method for transmitting Downlink Control Information (DCI), a method for blind detection, a base station and terminal equipment, including: a base station generates a DCI, such that a bit length of the DCI of terminal equipment configured with a carrier segment is equal to that of a DCI of the same format of terminal equipment not configured with a carrier segment; the base station transmits the DCI for the terminal equipment configured with the carrier segment in a common search region of a control channel. Or the base station transmits user-specific DCI in a user-specific search region for the terminal equipment configured with the carrier segment, while does not transmit corresponding user-specific DCI in the common search region of the control channel. The bit length of the common search region will not be increased, avoiding the increase of the number of blind detections at the terminal equipment.
    Type: Application
    Filed: March 27, 2014
    Publication date: July 31, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU
  • Publication number: 20140211751
    Abstract: A method for transmitting an enhanced control signaling, a base station and user equipment (UE) are applicable to a coordinated multipoint transmission mode. The method including: transmitting, by a pico base station, an enhanced physical control format indication signaling (E-PCFICH) to UE configured with the mode, the E-PCFICH including control signaling length, wherein the control signaling length is of a pico cell, or a maximum value of control signaling lengths of a macro cell and a pico cell. With the embodiments of the invention, the E-PCFICH including control signaling length is adopted in a pico cell, so that the UE can determine a starting position of the data area PDSCH of the pico cell according to the control signaling length, thereby solving the problem that the data area of the pico cell cannot be accurately determined under the CoMP mode, and ensuring that the UE correctly receives data.
    Type: Application
    Filed: March 26, 2014
    Publication date: July 31, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yuantao ZHANG, Yi ZHANG, Yi WANG, Hua ZHOU
  • Publication number: 20140206362
    Abstract: Embodiments of the present invention provide a method and apparatus for determining a starting symbol of a physical downlink shared channel; wherein, a Pico base station transmits information indicating a PDSCH starting symbol of the Pico base station to a Macro base station, the Macro base station transmits the information indicating a PDSCH starting symbol to a terminal, and the terminal determines the PDSCH starting symbol in accordance with the information indicating a PDSCH starting symbol. With the embodiments of the present invention, the terminal within a serving range of the Pico base station resulted from a high offset value will not incorrectly decode a PCFICH due to interference of the Macro base station, thereby making the terminal determine a demarcation symbol between a PDCCH and a PDSCH, further increasing the coverage of the Pico base station, and realizing load balancing of the Macro base station and Pico base station.
    Type: Application
    Filed: March 26, 2014
    Publication date: July 24, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Haibo XU, Yuantao ZHANG, Yanling LU, Weiwei WANG, Ningjuan CHANG
  • Publication number: 20140185699
    Abstract: A data transmission method and system, transmitter and receiver. The method includes: mapping, by a transmitter, a plurality of data streams to a plurality of antennas of the transmitter by using precoding matrices and transmitting the plurality of data streams to a receiver via the plurality of antennas, wherein the transmitter selects the precoding matrices by taking a resource block as a granularity. With the embodiments of the present invention, the transmitter may transmit data streams to the receiver by using the precoding matrices W, and selects the precoding matrices W by taking a resource block (RB) as a granularity, so as to support DM-RS demodulation, and the receiver is not needed to perform PMI feedback, which is also applicable to a scenario where user feedback is not supported or PMI feedback is inaccurate, thereby achieving open-loop spatial multiplexing CoMP transmission.
    Type: Application
    Filed: March 5, 2014
    Publication date: July 3, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Jian ZHANG, Yuantao ZHANG, Yi ZHANG, Yi WANG, Hua ZHOU
  • Publication number: 20140153432
    Abstract: Embodiments of the present invention provide a method for reporting channel state information, user equipment and base station. The method includes: receiving, by user equipment, an indication signaling transmitted by a base station, the indication signaling comprising identification information for triggering report of aperiodic channel state information; determining a measurement set of the report of the aperiodic channel state information according to the identification information; and reporting corresponding channel state information to the base station according to the measurement set. With the embodiments of the present invention, the needed aperiodic CSI may be quickly fed back, thereby achieving relatively flexible aperiodic report.
    Type: Application
    Filed: February 7, 2014
    Publication date: June 5, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi ZHANG, Yi WANG, Yuantao ZHANG, Hua ZHOU