Patents by Inventor Xiliang Luo

Xiliang Luo 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: 9209932
    Abstract: A method for transmitting a channel quality indicator-only feedback payload is described. A channel quality indicator scheduling message is received from a base station. A channel quality indicator-only feedback payload is generated. The channel quality indicator-only feedback payload is transmitted on a physical uplink shared channel. The method may be performed by a wireless communication device.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: December 8, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Xiliang Luo, Peter Gaal, Wanshi Chen, Juan Montojo
  • Publication number: 20150319751
    Abstract: A wireless communication method includes allocating physical uplink control channel (PUCCH) data in first slot to a first orthogonal cover code (OCC). The method also includes allocating PUCCH data in a second slot of the same subframe to a different orthogonal cover code (OCC). Another method includes mapping PUCCH resources to physical resource blocks based on a user equipment (UE) specific signaling parameter (e.g., a resource index) and a number of symbols in a slot of a subframe.
    Type: Application
    Filed: June 26, 2015
    Publication date: November 5, 2015
    Inventors: Peter GAAL, Wanshi CHEN, Xiliang LUO, Juan MONTOJO
  • Patent number: 9178640
    Abstract: User equipment (UE) associated with synchronous networks operate in a synchronous mode while UEs associated with asynchronous networks operate in an asynchronous mode. When operating in a synchronous mode, a UE can significantly improve performance of synchronization signal detection, data decoding, and tracking loop management by using the interference cancellation (IC) techniques that are not available in an asynchronous mode of operation. Obtaining synchronization indicators and determining the synchronization status of the current network by UE is disclosed. The determination may be based on the synchronization indicator, whether detected through signal detection, signal measurements, signal analysis, or the like.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: November 3, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Kapil Bhattad, Tao Luo, Taesang Yoo, Xiaoxia Zhang, Xiliang Luo, Ke Liu, Durga Prasad Malladi
  • Publication number: 20150312934
    Abstract: Techniques for acknowledging data transmissions in a multi-carrier wireless communication network are disclosed. In some aspects, a user equipment (UE) receives a data transmission on at least one component carrier (CC) in a plurality of configured CCs. The UE determines acknowledgement/negative acknowledgement (ACK/NACK) information for the data transmission and determines an uplink channel for sending the ACK/NACK information. When the ACK/NACK information is sent on a PUCCH, the UE may perform power control based on which CCs in the plurality of configured CCs data is received. When the ACK/NACK information is sent on a PUSCH, the UE may determine a number of resource elements based on its CC configuration.
    Type: Application
    Filed: July 6, 2015
    Publication date: October 29, 2015
    Inventors: Wanshi Chen, Xiaoxia Zhang, Peter Gaal, Juan Montojo, Xiliang Luo, Tao Luo, Jelena Damnjanovic, Aleksandar Damnjanovic
  • Patent number: 9172513
    Abstract: A wireless communication method includes allocating physical uplink control channel (PUCCH) data in first slot to a first orthogonal cover code (OCC). The method also includes allocating PUCCH data in a second slot of the same subframe to a different orthogonal cover code (OCC). Another method includes mapping PUCCH resources to physical resource blocks based on a user equipment (UE) specific signaling parameter (e.g., a resource index) and a number of symbols in a slot of a subframe.
    Type: Grant
    Filed: October 7, 2011
    Date of Patent: October 27, 2015
    Assignee: QUALCOMM INCORPORATED
    Inventors: Peter Gaal, Wanshi Chen, Xiliang Luo, Juan Montojo
  • Publication number: 20150289257
    Abstract: Techniques for sending control information relating to multiple downlink carriers and data on a single uplink carrier are described. A user equipment (UE) may be scheduled to transmit on a designated uplink carrier. The UE can multiplex control information for multiple downlink carriers with data for transmission on the uplink carrier in a same subframe. Multiplexing may be performed according to a type of the control information and/or an ordering, priority, or association of the downlink carriers. The UE can selectively encode the control information separately for each downlink carrier and/or jointly across downlink carriers. The control information may be mapped to a single layer or multiple layers of a data channel. The UE may send the multiplexed control information and data on the data channel in the subframe while maintaining a single-carrier waveform.
    Type: Application
    Filed: June 18, 2015
    Publication date: October 8, 2015
    Inventors: Xiliang Luo, Wanshi Chen, Tao Luo, Peter Gaal, Xiaoxia Zhang, Hao Xu, Juan Montojo
  • Publication number: 20150264610
    Abstract: An idle mode UE can RACH to a cell different from the cell paging the UE. The UE can be allocated additional time to respond to all cells in the neighborhood to identify the cell in which to RACH. Interference cancellation can occur at different rates based on whether the UE is in connected mode or idle mode. The time to respond to the page can be a function of a paging cycle. Additionally, a variable bias may promote early handoff to lower power cells and late handoff to high power cells.
    Type: Application
    Filed: May 29, 2015
    Publication date: September 17, 2015
    Inventors: Kapil BHATTAD, Alexei Yurievitch GOROKHOV, Tingfang JI, Ke LIU, Tao LUO, Xiliang LUO
  • Patent number: 9137076
    Abstract: Techniques for efficiently multiplexing a reference signal and data on different sets of subcarriers in the same symbol period are described. In one design, a user equipment (UE) performs a discrete Fourier transform (DFT) on a set of modulation symbols for data to obtain data symbols. The UE also obtains reference symbols generated based on a reference signal sequence corresponding to a cyclic shift of a base sequence. The UE maps the reference symbols to a first set of subcarriers and maps the data symbols to a second set of subcarriers. The UE then generates a transmission symbol based on the mapped reference symbols and the mapped data symbols. The UE may also transmit reference signals and data (i) in multiple symbol periods of a slot or a subframe and/or (ii) from multiple antennas using frequency division multiplexing (FDM) or code division multiplexing (CDM).
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: September 15, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Xiliang Luo, Juan Montojo, Peter Gaal, Ravi Palanki
  • Publication number: 20150246128
    Abstract: A composition includes a composite material including at least one conducting polymer doped with graphene oxide and at least one agent immobilized at least one of (i) on graphene oxide extending from the surface of the composite material or (ii) within the composite material.
    Type: Application
    Filed: October 4, 2013
    Publication date: September 3, 2015
    Inventors: Xinyan Cui, Xiliang Luo, Cassandra Weaver
  • Publication number: 20150237548
    Abstract: Antenna selection and reassignment in multiple radio access technology (RAT) communication systems with unlicensed spectrum is disclosed. Aspects include a user equipment (UE) monitoring for a channel reserving signal in each frame from multiple transmission sources. If no channel reserving signal is detected, then the UE reassigns one or more of the antennas previously assigned to the transmission sources with no activity detected. Additional aspects include base stations that determine a clear channel assessment (CCA) status for each of unlicensed carrier designated for transmission to a UE. The base station will transmit a receive antenna usage adjustment signal to the UE based on the determined CCA status.
    Type: Application
    Filed: February 18, 2015
    Publication date: August 20, 2015
    Inventors: Tao Luo, Durga Prasad Malladi, Xiliang Luo, Yongbin Wei
  • Patent number: 9112692
    Abstract: Techniques for acknowledging data transmissions in a multi-carrier wireless communication network are disclosed. In some aspects, a user equipment (UE) receives a data transmission on at least one component carrier (CC) in a plurality of configured CCs. The UE determines acknowledgement/negative acknowledgement (ACK/NACK) information for the data transmission and determines an uplink channel for sending the ACK/NACK information. When the ACK/NACK information is sent on a physical uplink control channel (PUCCH), the UE may perform power control based on which CCs in the plurality of configured CCs data is received. When the ACK/NACK information is sent on a physical uplink shared channel (PUSCH), the UE may determine a number of resource elements based on its CC configuration.
    Type: Grant
    Filed: August 13, 2011
    Date of Patent: August 18, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Wanshi Chen, Xiaoxia Zhang, Peter Gaal, Juan Montojo, Xiliang Luo, Tao Luo, Jelena M. Damnjanovic, Aleksandar Damnjanovic
  • Patent number: 9106389
    Abstract: A method for transmitting an acknowledgement/negative acknowledgement is described. Cell-specific symbol-level cyclic shift hopping is applied to data single-carrier frequency division multiplexing symbols of the acknowledgement/negative acknowledgement. A discrete Fourier transform is applied to the data single-carrier frequency division multiplexing symbols. Cell-specific symbol-level phase hopping is applied to the data single-carrier frequency division multiplexing symbols. The data single-carrier frequency division multiplexing symbols are transmitted in a slot.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: August 11, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Xiliang Luo, Peter Gaal, Wanshi Chen, Hao Xu, Tao Luo, Kapil Bhattad, Xiaoxia Zhang
  • Patent number: 9106419
    Abstract: Techniques for acknowledging data transmissions in a multi-carrier wireless communication network are disclosed. In one aspect, a UE determines a number of acknowledgement/negative acknowledgement (ACK/NACK) bits for a data transmission on one more component carriers (CCs) based on information obtained from a grant. The grant may be a downlink grant or an uplink grant, and the information obtained may include a number of CCs scheduled for data transmission and/or identifiers of the scheduled CCs. The UE may determine the number of ACK/NACK bits for acknowledging the data transmission based on the number of scheduled CCs and the identifier of each scheduled CC.
    Type: Grant
    Filed: August 13, 2011
    Date of Patent: August 11, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Wanshi Chen, Xiaoxia Zhang, Peter Gaal, Juan Montojo, Xiliang Luo, Tao Luo, Jelena M. Damnjanovic, Aleksandar Damnjanovic
  • Patent number: 9100155
    Abstract: A method of wireless communication includes determining a number of symbols for uplink control information (UCI) on each of a plurality of layers, multiplexing symbols for the UCI with data on multiple layers such that the symbols are time aligned across the layers, and sending the multiplexed symbols on the multiple layers on uplink. In some designs, the number of symbols for the UCI may be determined based on a spectral resource parameter.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: August 4, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Xiliang Luo, Tao Luo, Hao Xu, Wanshi Chen, Xiaoxia Zhang, Peter Gaal, Juan Montojo
  • Patent number: 9083501
    Abstract: Techniques for sending control information relating to multiple downlink carriers and data on a single uplink carrier are described. A user equipment (UE) may be scheduled to transmit on a designated uplink carrier. The UE can multiplex control information for multiple downlink carriers with data for transmission on the uplink carrier in a same subframe. Multiplexing may be performed according to a type of the control information and/or an ordering, priority, or association of the downlink carriers. The UE can selectively encode the control information separately for each downlink carrier and/or jointly across downlink carriers. The control information may be mapped to a single layer or multiple layers of a data channel. The UE may send the multiplexed control information and data on the data channel in the subframe while maintaining a single-carrier waveform.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: July 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Xiliang Luo, Wanshi Chen, Tao Luo, Peter Gaal, Xiaoxia Zhang, Hao Xu, Juan Montojo
  • Patent number: 9084149
    Abstract: A method for communicating in an advanced long term evolution (LTE-A) network using common reference signal (CRS) resources associated with different interference levels due to resource partitioning is disclosed. Signals are received from an eNodeB indicating a subset of CRS resources for radio link monitoring (RLM) and/or reference signal received power (RSRP) measuring. The subset of CRS resources includes the CRS resources expected to have lower interference from the interfering eNodeBs. RLM and/or RSRP measurements are performed based on the indicated subset.
    Type: Grant
    Filed: April 2, 2014
    Date of Patent: July 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Taesang Yoo, Tao Luo, Xiliang Luo
  • Publication number: 20150195065
    Abstract: A precoding scheme to accommodate user equipment (UEs) having higher Doppler speeds. In such transmission schemes, a different precoding matrix is applied to each orthogonal frequency division multiplex (OFDM) symbol in the transmission stream. Additionally, a downlink control message format is defined to handle assignment of multiple different transmission schemes using the same message format. The downlink control message format includes a control element in one of the message fields along with a set of parameters specifically applicable to the assigned transmission scheme. Based on the value of this control element, the UE sets the specific transmission scheme and determines a set of interpretation rules uniquely associated with that transmission scheme. Using the interpretation rules, the UE is able to read the set of parameters as applied to the selected transmission scheme.
    Type: Application
    Filed: March 18, 2015
    Publication date: July 9, 2015
    Inventors: Xiliang Luo, Peter Gaal, Juan Montojo, Wanshi Chen, Hao Xu, Tao Luo, Kapil Bhattad
  • Patent number: 9078201
    Abstract: An idle mode UE can RACH to a cell different from the cell paging the UE. The UE can be allocated additional time to respond to all cells in the neighborhood to identify the cell in which to RACH. Interference cancellation can occur at different rates based on whether the UE is in connected mode or idle mode. The time to respond to the page can be a function of a paging cycle. Additionally, a variable bias may promote early handoff to lower power cells and late handoff to high power cells.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: July 7, 2015
    Assignee: QUALCOMM INCORPORATED
    Inventors: Kapil Bhattad, Alexei Yurievitch Gorokhov, Tingfang Ji, Ke Liu, Tao Luo, Xiliang Luo
  • Publication number: 20150181641
    Abstract: Methods, systems, and devices are described for a UE to determine a DRX wakeup rule in an eICIC environment. A UE may identify a measurement period associated with reduced interference from one or more cells in a wireless communications network. The cells may be a serving cell or a neighbor cell. The measurement period may be identified based on eICIC data available to the UE. The eICIC data may be sent to the UE by a serving cell and/or determined by the UE. The UE may power up a wireless modem to perform a warm-up measurement of the serving cell during the identified measurement period prior to transitioning the UE to a DRX on state.
    Type: Application
    Filed: December 23, 2013
    Publication date: June 25, 2015
    Applicant: QUALCOMM Incorporated
    Inventors: Amir Farajidana, Xiliang Luo, Alexei Yurievitch Gorokhov, Hisham A. Mahmoud, Keith William Saints
  • Patent number: 9059756
    Abstract: Methods and apparatuses are provided that include providing transmit diversity for data channel transmissions. Different precoding vectors can be used over different slots of a given subframes to precode corresponding signals. The precoding vectors, in one example, can be orthogonal. In addition, using the different precoding vectors can be determined based on a user equipment receiving an indicator from a base station receiving the data channel transmissions of whether to use frequency hopping over the slots. Moreover, precoding vectors used to precode data channel transmissions can additionally or alternatively vary across subframes.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: June 16, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Peter Gaal, Wanshi Chen, Xiliang Luo, Juan Montojo