Patents by Inventor Yingyu Zhang

Yingyu 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: 20120281657
    Abstract: A base station in a downlink multi-antenna multi-base station system comprises: a unit for acquiring spatial domain characteristic information for downlink interference; a unit for generating an interference coordination indication based on the spatial domain characteristic information for downlink interference; and a background interface communication unit for transmitting the generated interference coordination indication to a neighboring base station, instructing the neighboring base station to perform resource scheduling, thereby reducing or eliminating interference on the base station. Also disclosed is a method for interference coordination, which is capable of reducing or eliminating interference on a serving base station from its neighboring base stations by utilizing an interference coordination indication transmitted from the serving base station. Only a small amount of inter-base station signaling interaction is required to achieve distributed inter-cell interference coordination.
    Type: Application
    Filed: January 7, 2011
    Publication date: November 8, 2012
    Inventors: Ming Ding, Renmao Liu, Yongming Liang, Yingyu Zhang, Zeng Yang
  • Publication number: 20120224551
    Abstract: The present invention discloses an information feedback method. The method comprises steps of a serving cell and/or a user equipment determining a cooperating cell set participating multi-antenna-multi-cell cooperation, the cooperating cell set including the serving cell and non-serving cells, the user equipment and/or the serving cell selecting transmit-ports of the serving cell and non-serving cells according to the determined cooperating cell set, the user equipment obtaining channel state information of the selected transmit-ports, and the user equipment feeding back identification information and the channel state information of the selected transmit-ports. The present invention provides also a serving cell, a cooperative cell and a user equipment for feeding back the identification information and channel state information of the selected transmit-ports. The present invention has advantages of simple implementation and less signaling overhead.
    Type: Application
    Filed: July 15, 2010
    Publication date: September 6, 2012
    Inventors: Ming Ding, Renmao Liu, Yongming Liang, Yingyu Zhang, Zeng Yang
  • Publication number: 20120207119
    Abstract: A method of notifying resource allocation for Demodulation Reference Signal (DMRS) is provided. A base station notifies to a user equipment a power offset value between an average EPRE value for data symbols and an average EPRE value for the DMRS at each layer in a semi-static or static manner. Also, the base station dynamically notifies to the user equipment a current channel rank or a current DMRS distribution pattern for the user equipment. The user equipment determines an allocated DMRS antenna port based on a correspondence between the received channel rank and an allocation of DMRS antenna port, thereby obtaining resource allocation information for the DMRS. The signaling overhead for power allocation in the system can be reduced, the efficiency of power amplifier can be improved and the flexibility of system scheduling can be increased. A method of notifying antenna port resource allocation for DMRS is also provided.
    Type: Application
    Filed: October 28, 2010
    Publication date: August 16, 2012
    Inventors: Yingyu Zhang, Renmao Liu, Ming Ding, Yongming Liang, Zeng Yang
  • Publication number: 20120087333
    Abstract: A mobile communication system where a base station and a user equipment communicates on multiple aggregated carriers is disclosed. In the mobile communication system, the base station notifies to the user equipment information which is relevant to inclusion of an information field indicating scheduling carrier in downlink control information format by using radio resource control signaling, and the user equipment receives, from the base station, downlink control information in the downlink control information format according to the information which is relevant to inclusion of the information field indicating scheduling carrier.
    Type: Application
    Filed: June 3, 2010
    Publication date: April 12, 2012
    Inventors: Lei Huang, Renmao Liu, Yingyu Zhang, Ming Ding
  • Publication number: 20120015662
    Abstract: The present invention provides a relay collaborative cellular mobile communication system and a communication method of the system. In the method, all relay stations or a base station and relay stations in a cell (i) measure all uplink signals such as uplink reference signals and random-access signals from user devices for obtaining reception qualities of uplink signals of the user devices at the sites and (ii) feed back measurement results to the base station. The base station determines a transmission route of a user device based on the measurement results. A site in a transmission route processes schedule control information and then transmits the information to the user device for performing, based on lumped scheduling of the base station, a downlink reception, an uplink transmission, an uplink retransmission, or a downlink retransmission.
    Type: Application
    Filed: February 2, 2010
    Publication date: January 19, 2012
    Inventors: Yingyu Zhang, Renmao Liu, Lei Huang, Ming Ding, Guolin Sun, Chen Chen
  • Publication number: 20120004014
    Abstract: The present invention discloses a channel reconstruction method for a downlink multi-antenna-multi-base-station with inconsistent antenna configuration. Firstly, a serving base station configures a user equipment. If antenna configuration of the multi-antenna-multi-base-station system is inconsistent, virtual antennas are introduced to a base station with fewer antennas in the system. A user equipment selects and feeds back indices of the virtual antennas and reconstructs channels of the multi-antenna-multi-base-station system to generate a consistent antenna configuration. Finally, the multi-antenna-multi-base-station system transmits a signal to the user equipment by adopting a transmission pre-processing scheme of the consistent antenna configuration. The present invention provides also a serving base station, a cooperative base station and a user equipment for realizing the channel reconstruction method.
    Type: Application
    Filed: March 8, 2010
    Publication date: January 5, 2012
    Inventors: Ming Ding, Renmao Liu, Yingyu Zhang, Lei Huang, Chen Chen
  • Publication number: 20110274026
    Abstract: The present invention provides a method for allowing transparent transmission and non-transparent transmission of a relay node to coexist. That is, a frequency-division multiplex system is employed so that a transparent transmission mode is used in one operating carrier frequency bandwidth whereas a non-transparent transmission mode is used in another operating carrier frequency bandwidth. In addition, according to the frequency-division multiplex system, the transparent transmission mode is used for a plurality of subframes whereas the non-transparent transmission mode is used for another plurality of subframes. The method for allowing transparent transmission and non-transparent transmission of a relay node to coexist makes it possible to effectively reduce a cost of a system.
    Type: Application
    Filed: December 28, 2009
    Publication date: November 10, 2011
    Inventors: Lei Huang, Renmao Liu, Yingyu Zhang, Ming Ding, Chen Chen, Guolin Sun
  • Publication number: 20110206154
    Abstract: The present invention provides a precoding method for use in a wireless communications system. According to the precoding method of the present invention, a serving base station and cooperative communication base stations employ an identical precoding matrix so as to weight transmission signals and then transmit them. The weighting stands for multiplication of results of overall precoding or each layer precoding process by weight values at the serving base station and the cooperative communication base stations. A user device corresponding to the serving base station and the cooperative communication base stations receives a signal which is obtained by an operation in which the serving base station and the cooperative communication base stations perform an identical precoding process and additively combine results of overall precoding or each layer precoding process with one another.
    Type: Application
    Filed: November 4, 2009
    Publication date: August 25, 2011
    Inventors: Ming Ding, Renmao Liu, Yingyu Zhang, Lei Huang, Chen Chen, Guolin Sun
  • Publication number: 20110164549
    Abstract: This invention provides a mobile communication system, including: a base station device; and a mobile station device, the mobile communication system having a predetermined total bandwidth made of a set of a plurality of downlink component carriers, the base station device and the mobile station device processing each downlink physical layer provided for a respective one of the plurality of downlink component carriers, and the set of the plurality of downlink component carriers including (i) a downlink component carrier employing a subframe structure according to which some symbols at the beginning of a subframe include control information and (ii) a downlink component carrier employing a subframe structure according to which some symbols at the beginning of a subframe do not include control information.
    Type: Application
    Filed: September 18, 2009
    Publication date: July 7, 2011
    Inventors: Lei Huang, Renmao Liu, Ming Ding, Chen Chen, Guolin Sun, Yingyu Zhang