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).

  • 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
  • Patent number: 8743947
    Abstract: A method and apparatus for determining a precoding matrix and a wireless communication system. In data retransmission, when the retransmission rank is less than an initial transmission rank, the transmitting end selects a matrix having a maximum similarity with an initial transmission precoding matrix in spatial direction according to the retransmission rank. In multiple data retransmissions, precoding matrixes for the retransmissions are different from each other and may have a minimum similarity in the spatial direction, but have a maximum similarity with the initial transmission precoding matrix in the spatial direction. Or, the similarity between each retransmission precoding matrix and the initial transmission precoding matrix in the spatial direction progressively decreases.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: June 3, 2014
    Assignee: Fujitsu Limited
    Inventors: Yi Wang, Yi Zhang, Yuantao Zhang, Hua Zhou, Jianming Wu
  • Publication number: 20140133448
    Abstract: A method and apparatus for uplink power control, including: transmitting, by user equipment, a sounding reference signal (SRS) to a network side according to a received triggering signal; receiving, by the user equipment, a path loss compensation value calculated based on the SRS and transmitted by the network side; estimating, by the user equipment, a path loss value according to a received cell-specific reference signal (CRS); and performing, by the user equipment, power compensation according to the path loss compensation and path loss values. On the basis of the original uplink power control performed according to the path loss estimated based on the downlink CRSs, the network side estimates the path loss compensation value of the UE by triggering the RRH UE to transmit aperiodic SRSs, and informs the UE in a semi-static manner, compensating for the inaccuracy of estimation of path loss and ensuring the efficiency of power control.
    Type: Application
    Filed: January 23, 2014
    Publication date: May 15, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yueqiao XU, Yi ZHANG, Yi WANG, Yuantao ZHANG, Hua ZHOU
  • Publication number: 20140133440
    Abstract: The present invention relates to methods for sending and receiving downlink control information, a base station, and a mobile terminal. The method for sending downlink control information comprises: sending first downlink control information to a mobile terminal, the first downlink control information being a part of downlink control information and comprising resource allocation information; on resource specified by the resource allocation information, sending second downlink control information to the mobile terminal, the second downlink control information being the other part, different from the first downlink control information, of the downlink control information.
    Type: Application
    Filed: January 20, 2014
    Publication date: May 15, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yuantao ZHANG, Yi WANG, Hua ZHOU
  • Publication number: 20140133441
    Abstract: A method and apparatus for transmitting control signaling includes: transmitting indication information on a transmission location of control signaling by a base station to a mobile station configured as an open-loop MIMO transmission mode; transmitting the control signaling by the base station in a data region by using the open-loop MIMO transmission mode or a transmit diversity transmission mode if the location for transmitting the control signaling indicated by the information on a transmission location of control signaling is located at the data region. Whereby the number of mobile stations to be scheduled in a cell is increased and results in the scheduling information to be transmitted in a subframe increased, the control signaling of a mobile station configured as an open-loop MIMO transmission mode is placed in a data region for transmission, thereby increasing the number of UE scheduled, increasing the throughput of the system.
    Type: Application
    Filed: January 20, 2014
    Publication date: May 15, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yuantao ZHANG, Yi WANG, Yi ZHANG, Hua ZHOU
  • Publication number: 20140133345
    Abstract: A method and apparatus for establishing a mapping relationship and for feeding back channel quality information. The methods are applicable to terminal equipment configured with a coordinated multiple-point feedback mode, the method for establishing a mapping relationship includes: determining, by terminal equipment, the number of bits for denoting differential channel quality information and mapping relationship between each of bit values of the differential channel quality information and an offset reference value according to a CoMP transmission mode, so as to feed back the differential channel quality information by using the mapping relationship; wherein in the mapping relationship, a plurality of offset reference values to which the bit values in an order from small to large correspond are a plurality of incremental integers.
    Type: Application
    Filed: January 23, 2014
    Publication date: May 15, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU
  • Publication number: 20140119321
    Abstract: A method for transmitting sounding reference symbol, a base station and user equipment. The method comprises: configuring, by a base station, user equipment of a CoMP transmission mode, with parameter configuration information for transmitting SRS, the parameter configuration information including a frequency comb of the SRS and one or more pieces of the following information: cyclic shift, root sequence information, power control information, and transmission duration information, of the SRS; and transmitting the parameter configuration information to the user equipment by the base station, such that the user equipment transmits the SRS to the base station according to the parameter configuration information. The method is simple and flexible, efficiently uses limited SRS resources, and solves the problem in the prior art.
    Type: Application
    Filed: January 2, 2014
    Publication date: May 1, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU
  • Publication number: 20140119322
    Abstract: A power compensation method, base station and user equipment. The method includes: transmitting, by a base station, when an expanded UE-specific PDCCH is amplitude phase keying modulated, a first ratio of the EPRE of the expanded UE-specific downlink control channel to the EPRE of a DM-RS in a first time slot occupied by the expanded UE-specific PDCCH, so that the terminal equipment performs power compensation in decoding the received data transmitted by the base station according to the first ratio, thereby ensuring correct demodulation of the received data by the terminal equipment.
    Type: Application
    Filed: January 2, 2014
    Publication date: May 1, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU
  • Publication number: 20140119335
    Abstract: Embodiments of the present invention provide a method for transmitting downlink control signaling, a method for searching downlink control signaling and an apparatus used for the same. The method for transmitting includes: transmitting downlink control information (DCI) in a common search space of a control region of a wireless communications system, the DCI indicating a search space of a UE-specific physical downlink control channel (PDCCH) located in a data region of the wireless communications system, the DCI further including a predetermined identifier for identifying the DCI. With the methods and apparatuses of the embodiments of the present invention, the search space of the PDCCH may be dynamically adjusted, thereby saving signaling overhead, and avoiding inconsistence of the search space of the base station and that of the UE.
    Type: Application
    Filed: January 2, 2014
    Publication date: May 1, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU
  • Patent number: 8705590
    Abstract: A demodulation reference signal generator includes a non-correlation sequence generator to generate a non-correlation sequence for RS of a first resource block; a first spectrum spreading unit to spread 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; a second spectrum spreading unit to spread spectrums of elements in the non-correlation sequence for RS to be mapped to a second frequency resource of the first resource block, using a second group of Codes; the first and second frequency resources are adjacent frequency resources 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 a mapping unit to map the spectrum-spread elements to the first and second frequency resources.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: April 22, 2014
    Assignee: Fujitsu Limited
    Inventors: Yi Wang, Yuantao Zhang, Hua Zhou, Jianming Wu
  • Publication number: 20140078997
    Abstract: Embodiments of the present invention provide an MU-MIMO transmission method, user equipment and base station. The method comprises: receiving by user equipment a signaling indication indicative of supporting a user to use a layer index transmitted by a base station, the signaling indication including a first layer index and a sum number of layers of the user equipment; and demodulating a received resource according to the first layer index and the sum number of layers of the user equipment; wherein in the resource, consecutive layer indices are adopted for data corresponding to the same user equipment. With the embodiments of the present invention, a mapping manner from a codeword to a layer may be further limited and optimized, and compromise of the feedback overhead, feedback accuracy and system signaling overhead may be better achieved.
    Type: Application
    Filed: November 21, 2013
    Publication date: March 20, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi ZHANG, Yuantao ZHANG, Hua ZHOU, Jianming WU
  • Publication number: 20140079095
    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: November 22, 2013
    Publication date: March 20, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU, Jianming WU
  • Patent number: 8675764
    Abstract: A method and an apparatus for generating a precoding matrix codebook group are provided by the present invention. The method includes: a step for generating a channel matrix set; a step for generating a performance parameter matrix; and a step for generating a precoding matrix codebook group: based on the generated performance parameter matrix, according to contribution of every precoding matrix to the performance parameter of the communication system, ranking the precoding matrices in precoding matrix universal set, so as to achieve an ordered precoding matrix universal set as the precoding matrix codebook group. A method for assigning a precoding matrix for a multi-antenna communication system, a method for transmitting data for a multi-antenna communication system, a base station and a mobile station thereof are provided by the present invention.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: March 18, 2014
    Assignee: Fujitsu Limited
    Inventors: Jian Wang, Jun Tian, Jianming Wu, Yuantao Zhang
  • Publication number: 20140064394
    Abstract: The present invention relates to a User Equipment (UE), a base station and a method for selecting a Remote Radio Head (RRH). A UE, including: a storage unit configured to store a code book including a plurality of precoding matrixes which contain a precoding matrix having an element zero corresponding to an antenna; a precoding matrix selection unit configured to select the precoding matrix to be used according to the code book stored in the storage unit; and a report unit configured to report an index of the precoding matrix selected by the precoding matrix selection unit. In the preferred embodiments, elements of a same precoding matrix for antennas of same RRH are all zero or non-zero.
    Type: Application
    Filed: November 4, 2013
    Publication date: March 6, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi WANG, Yuantao ZHANG, Hua ZHOU
  • Publication number: 20140056267
    Abstract: Embodiments of the present invention provide a power compensating method, user equipment and base station. The method comprises: receiving by the base station a pathloss value reported by the user equipment, or calculating the pathloss value according to a reference signal receiving power value reported by the user equipment; and compensating for power according to the pathloss value. With the embodiments of the present invention, power of signals may be compensated, and the power of the receiving side is made identical in uplink or downlink transmission, thereby multiplexing a transmission mode based on a codebook.
    Type: Application
    Filed: November 4, 2013
    Publication date: February 27, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Hongchao LI, Yuantao ZHANG, Yi WANG, Hua ZHOU, Jianming WU
  • Publication number: 20140056269
    Abstract: Embodiments of the present invention provide method for configuring a transmission mode, user equipment and a base station. The method includes: receiving, by the user equipment, a higher layer signaling transmitted by the base station, the higher layer signaling containing information instructing the user equipment to configure a transmission mode; and configuring the transmission mode for the user equipment according to the information, the transmission mode being based on a CRS or a DM-RS. With the embodiments of the present invention, reusable bandwidth resources may be increased.
    Type: Application
    Filed: November 5, 2013
    Publication date: February 27, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yuantao ZHANG, Yi WANG, Yi ZHANG, Hua ZHOU, Jianming WU
  • Publication number: 20140050174
    Abstract: A method for configuring resource, method for transmitting response signal, base station and user equipment. The method for configuring resource comprises: configuring a PHICH resource in a data region of a second slot in the data resources scheduled to user equipment in a current subframe. The base station may transmit a response signal via the configured data resource. As a new PHICH resource is configured, the problem of inadequate PHICH resources existed at present is solved.
    Type: Application
    Filed: October 28, 2013
    Publication date: February 20, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yuantao ZHANG, Yi WANG, Hua ZHOU, Jianming WU
  • Publication number: 20140050175
    Abstract: A cell identifier allocation apparatus and method, a base station, a readable program and a medium including acquiring location information of a macro base station and location information of each of a plurality of remote transmitting apparatuses connected to the macro base station; determining relative distances between the plurality of remote transmitting apparatuses and relative distances between the macro base station and each of the plurality of remote transmitting apparatuses; classifying the macro base station and the plurality of remote transmitting apparatuses into a plurality of sets, according to the relative distances between the plurality of remote transmitting apparatuses and the relative distances between the macro base station and each of the plurality of remote transmitting apparatuses; allocating cell identifiers to the plurality of remote transmitting apparatuses; and generating information to be transmitted to corresponding remote transmitting apparatus according to the allocated cell iden
    Type: Application
    Filed: October 29, 2013
    Publication date: February 20, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Yi ZHANG, Hua ZHOU, Yuantao ZHANG, Jianming WU
  • Publication number: 20130324133
    Abstract: The present invention discloses a method and a device for selecting a cell in a heterogeneous network. The method comprises estimating signal to noise ratios when a terminal is scheduled by a macro base station and a low power base station respectively by using the parameters of the macro base station and the low power base station measured by the terminal and related to signal reception quality (S101); mapping the estimated signal to noise ratios to throughputs, and obtaining a first throughput when the terminal is scheduled by the macro base station, and a second throughput when the terminal is scheduled by the low power base station (S102); and adjusting a cell selection offset according to the first throughput and the second throughput, so that the terminal can perform cell selection according to the adjusted cell selection offset (S103).
    Type: Application
    Filed: August 6, 2013
    Publication date: December 5, 2013
    Applicant: FUJITSU LIMITED
    Inventors: Hongchao LI, Yuantao ZHANG, Yi ZHANG, Hua ZHOU, Jianming WU
  • Publication number: 20130322321
    Abstract: A method, a wireless communication system, destination node and relay node includes receiving by a destination node at current time slot the data transmitted by at least one source node; demodulating and decoding the data transmitted by at least one source node to obtain a decoding result; receiving the decoding result transmitted by first relay nodes, the decoding result being obtained by the first relay nodes through demodulating and decoding the data transmitted by at least one source node and received at the current time slot; and notifying the source node to retransmit the data or transmit new data at the next time slot by the destination node according to the result of the demodulating and decoding of the data of the source node and the decoding result of the first relay nodes.
    Type: Application
    Filed: August 8, 2013
    Publication date: December 5, 2013
    Applicant: FUJITSU LIMITED
    Inventors: Yuantao ZHANG, Hua ZHOU, Jianming WU