Patents by Inventor Fengjun Xi

Fengjun Xi 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).

  • Multi-user interleaving and modulation in a wireless network
    Patent number: 10833712
    Abstract: A wireless transmit/receive unit (WTRU) may receive a constellation symbol that includes indications that each are associated with a respective WTRU of a plurality of WTRUs. The WTRU may determine that a first weight associated with a first indication of the indications is different than a second weight associated with a second indication of the indications. The indications may comprise indications of bits modulated at a multi-user constellation bit division multiple access modulator (MU-CBDMAM).
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: November 10, 2020
    Assignee: InterDigital Patent Holdings, Inc.
    Inventors: Fengjun Xi, Yuan Sheng Jin, Pengfei Xia, Oghenekome Oteri, Hanqing Lou, Nirav B. Shah, Robert L. Olesen
  • Method and system for advanced outer coding
    Patent number: 10826539
    Abstract: Communication devices, systems and methods for performing multi-layer packet coding (MLPC) in a wireless system are provided. The MLPC includes segmenting a data stream into a plurality of data segments, encoding each of the plurality of data segments into a plurality of forward error correction (FEC) codewords, performing a first exclusive OR (XOR) operation on the plurality of FEC codewords to generate a plurality of first layer parity codewords, performing a second XOR operation on the plurality of first layer parity codewords to generate at least one second layer parity codeword, and transmitting at least one of: the plurality of FEC codewords, the plurality of first layer parity codewords, or the at least one second layer parity codeword.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: November 3, 2020
    Assignee: IDAC Holdings, Inc.
    Inventors: Fengjun Xi, Chunxuan Ye, Kyle Jung-Lin Pan, Hanqing Lou, Nirav B. Shah
  • HARQ for advanced channel codes
    Patent number: 10790934
    Abstract: A method (2200) and apparatus for transmitting data using low density parity check, LDPC, encoding and hybrid automatic repeat request-incremental redundancy, HARQ-IR, is disclosed. The method may comprise selecting (2206) a protograph sub-matrix from a family of protograph matrices based on one or more of an initial code rate, an information block size, a maximum retransmission count or a maximum number of redundancy versions, wherein the selected protograph sub-matrix supports HARQ-IR. A parity check matrix may be determined based on the selected protograph sub-matrix (2208). One or more data blocks may be encoded using LDPC based on the parity check matrix (2218) and the LDPC encoded data block may be transmitted (2220) to an LDPC HARQ-IR configured receiver.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: September 29, 2020
    Assignee: IDAC Holdings, Inc.
    Inventors: Chunxuan Ye, Nirav B. Shah, Fengjun Xi, Kyle Jung-Lin Pan
  • POLAR CODING SYSTEM
    Publication number: 20200287654
    Abstract: Systems, methods, and instrumentalities are described herein for supporting CBG-based retransmission with variable CBG size using variable length HARQ-ACK. A WTRU may receive a configuration to use a first table. The first table may be associated with a maximum number of code block groups per transport block (maxCBG/TB). The WTRU may determine a number of HARQ-ACK bits to send for code blocks. The determination may depend on whether an indication is received to switch from the first table to a second table. On a condition that the indication to switch from the first table to the second table is received, the WTRU may send a number of HARQ-ACK bits that is equal to two times the maxCBG/TB. The WTRU may receive a retransmission of a number of code blocks, wherein a code block group size depends on a sent number of HARQ-ACK bits.
    Type: Application
    Filed: November 12, 2018
    Publication date: September 10, 2020
    Applicant: IDAC Holdings, Inc.
    Inventors: Fengjun Xi, Chunxuan Ye, Kyle Jung-Lin Pan
  • URLLC TRANSMISSIONS WITH POLAR CODES
    Publication number: 20200287659
    Abstract: Systems, procedures, and instrumentalities are disclosed for transmissions with polar codes. A transmitting entity may determine a mother code length. The mother code length may be based on value(s), e.g., a maximum number of transmissions. The transmitting entity may determine a number of information bits to be polar encoded. The number of information bits may be larger than a number of payload bits. The transmitting entity may map the number of information bits to a number of bit channels of a polar code. The transmitting entity may polar encode the information bits in the bit channels using the determined mother code length. The transmitting entity may partition the polar encoded bits into a number of parts. The number of parts may be based on one or more values, e.g., the maximum number of transmissions. The transmitting entity may transmit bits that have been interleaved to a circular buffer.
    Type: Application
    Filed: November 12, 2018
    Publication date: September 10, 2020
    Applicant: IDAC Holdings, Inc.
    Inventors: Chunxuan Ye, Fengjun Xi, Kyle Jung-Lin Pan
  • BEAM MANAGEMENT IN A WIRELESS NETWORK
    Publication number: 20200288479
    Abstract: A wireless transmit/receive unit (WTRU) may monitor control resource sets (CORESETs) to receive a physical downlink control channel (PDCCH) having downlink control information (DCI) that includes a scheduling offset and an indicated beam for a scheduled physical downlink shared channel (PDSCH) reception. When the scheduling offset of the scheduled PDSCH is less than a threshold, a default beam of a transmission configuration indication (TCI) state may be utilized to receive the scheduled PDSCH. When the scheduling offset of the scheduled PDSCH is more than a threshold, the indicated beam is utilized to receive the scheduled PDSCH on a condition that a measured quality is above a measurement threshold or the default beam may be utilized when the measured quality is below the measurement threshold.
    Type: Application
    Filed: November 15, 2018
    Publication date: September 10, 2020
    Applicant: IDAC HOLDINGS, INC.
    Inventors: Fengjun Xi, Wei Chen, Kyle Jung-Lin Pan, Moon-il Lee, Chunxuan Ye
  • System and method for advanced spatial modulation in 5G systems
    Patent number: 10756796
    Abstract: Systems and methods described herein are provided for radiation pattern and modulation (RPM) based on channel-state information (CSI). The method may comprise receiving a set of bits; dividing the set of bits into at least three groups, wherein at least one group is size limited by a diversity order and selection factor applied by a CSI controller; mapping the groups to distinct control signals; generating a modulated RF signal and selecting at least one configurable antenna and a configuration of said at least one antenna based on the control signals; and transmitting the modulated RF signal through the at least one configured antenna.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: August 25, 2020
    Assignee: IDAC Holdings, Inc.
    Inventors: Steven Ferrante, Fengjun Xi, Rui Yang, Chunxuan Ye, Kyle Jung-Lin Pan
  • MULTIPLE DIMENSION MODULATION IN 5G SYSTEMS
    Publication number: 20200259607
    Abstract: Systems and methods related to increased spectrum efficiency for 5G communications, comprising combining time, frequency, spatial, and signal domains for multi-dimension modulation. In one embodiment, the ability of reconfigurable antenna to change their radiation pattern and/or polarization modes may be used to modulate additional information onto the conventional SM-MIMO transmitted signal. In further embodiments, various combinations of space shift keying, block coding, multi-carrier modulation, and the like may be used to introduce additional dimensions for data modulation and achieve diversity gain.
    Type: Application
    Filed: March 29, 2017
    Publication date: August 13, 2020
    Inventors: Fengjun Xi, Steven Ferrante, Kyle Jung-Lin Pan, Alphan Sahin, Chunxuan Ye, Robert L. Olesen
  • REFERENCE SIGNAL CONFIGURATION FOR EXTENSION CARRIERS AND CARRIER SEGMENTS
    Publication number: 20200244498
    Abstract: Reference signals configured for use with extension carriers and/or carrier segments are described. Reference signals for extension carriers and/or carrier segments may include demodulation reference signals (e.g., user equipment-specific reference signals), cell-specific reference signals, and channel-state information reference signals. Methods, systems and apparatuses for configuring extension carriers and/or carrier segments with one or more of the reference signals (e.g., positioning one or more reference signal symbols in extension carriers and/or carrier segments) are described.
    Type: Application
    Filed: April 6, 2020
    Publication date: July 30, 2020
    Inventors: Sung-Hyuk Shin, Chang-Soo Koo, Fengjun Xi, Moon-il Lee, Janet A. Stern-Berkowitz, Ghyslain Pelletier
  • METHOD AND APPARATUS FOR LOW-DENSITY PARITY-CHECK (LDPC) CODING
    Publication number: 20200235759
    Abstract: An apparatus and method are described. The apparatus includes a transceiver and processor, which attach transport block (TB) level CRC bits to a TB, select an LDPC base graph (BG) based on a code rate (CR) and TB size of the TB including TB level CRC bits, determine a number of code blocks (CBs) to use for segmenting the TB including TB level CRC bits depending on the selected LDPC BG, determine a single CB size for each of the CBs based on the number of CBs, segment the TB including TB level CRC bits into the CBs based on the number of CBs and CB size, pad zeros to a last CB of the CBs in the segmented TB, attach CB level CRC bits to each CB in the segmented TB, encode each CB in the segmented TB using the selected LDPC base graph, and transmit the encoded CBs.
    Type: Application
    Filed: January 31, 2018
    Publication date: July 23, 2020
    Applicant: IDAC HOLDINGS, INC.
    Inventors: Chunxuan Ye, Hanqing Lou, Fengjun Xi, Kyle Jung-Lin Pan
  • TWO-STAGE SCRAMBLING FOR POLAR CODED PDCCH TRANSMISSION
    Publication number: 20200228236
    Abstract: A wireless transmit receive unit (WTRU) may receive a Physical Downlink Control Channel (PDCCH) transmission and perform early termination on the PDCCH transmission. Transmissions that are not intended for the WTRU may be terminated. The WTRU may perform a first decode of the PDCCH transmission based on a first scrambling sequence. The first scrambling sequence may be generated using a Gold sequence, which may be initialized based on a WTRU identifier. If the first decode is not successful, the WTRU may determine that the PDCCH transmission is not intended for the WTRU. The WTRU may perform an assistance bit added (ABA) polar decode of the PDCCH transmission based on a second scrambling sequence (e.g., a cell radio network temporary ID (C-RNTI)). The WTRU may perform a CRC on the output of the ABA polar decode to obtain downlink control information (DCI).
    Type: Application
    Filed: June 13, 2018
    Publication date: July 16, 2020
    Applicant: IDAC Holdings, Inc.
    Inventors: Fengjun Xi, Chunxuan Ye, Kyle Jung-Lin Pan, Sungkwon Hong
  • SYSTEMS AND/OR METHODS FOR PROVIDING ENHANCED PDCCH IN A MULTIPLE CARRIER BASED AND/OR QUASI-COLLATED NETWORK
    Publication number: 20200221426
    Abstract: ePDCCH may be provided. For example, a WTRU may receive a configuration for monitoring an ePDCCH resource. Based on the configuration, the WTRU may be configured to monitor and may monitor the ePDCCH resource on a particular subframe. Additionally, a WTRU may derive an aggregation level for a subframe associated with an aggregation level number NAL. The WTRU may transmit or monitor an ePDCCH using the aggregation level associated with the NAL for the subframe. A WTRU may also receive a reference signal. The WTRU may then determine the type of reference signal received. The WTRU may perform a demodulation of the PDSCH or ePDCCH using a demodulation timing based on the determined type. The ePDCCH or PDSCH may also be monitored or received by identifying a demodulation reference timing implicitly based on a location of one or more ePDCCH resources where the WTRU may receive DCI.
    Type: Application
    Filed: March 20, 2020
    Publication date: July 9, 2020
    Inventors: Moon-il Lee, Chang-Soo Koo, Sung-Hyuk Shin, Janet A. Stern-Berkowitz, Marian Rudolf, Fengjun Xi, Ananth Kini, Seyed Mohsen Hosseinian, Paul Marinier
  • CLASSIFICATION AND SILENCING FOR UPLINK MULTI-USER TRANSMISSIONS IN WLANS
    Publication number: 20200187231
    Abstract: Method, apparatuses, and systems for multi-user (MU) transmission is provided, including scheduling, by an access point (AP), an uplink (UL) MU transmission for a group of wireless transmit/receive units (WTRUs) in which there is an indication that at least one resource unit (RU) of a plurality of RUs is silenced. The silencing may be based on coordinating with one or more overlapping APs or by analyzing condition of channels associated with an AP.
    Type: Application
    Filed: February 18, 2020
    Publication date: June 11, 2020
    Applicant: InterDigital Patent Holdings, Inc.
    Inventors: Oghenekome Oteri, Hanqing Lou, Fengjun Xi, Rui Yang
  • SYSTEM AND METHOD FOR ADVANCED SPATIAL MODULATION IN 5G SYSTEMS
    Publication number: 20200145069
    Abstract: Systems and methods described herein are provided for radiation pattern and modulation (RPM) based on channel-state information (CSI). The method may comprise receiving a set of bits; dividing the set of bits into at least three groups, wherein at least one group is size limited by a diversity order and selection factor applied by a CSI controller; mapping the groups to distinct control signals; generating a modulated RF signal and selecting at least one configurable antenna and a configuration of said at least one antenna based on the control signals; and transmitting the modulated RF signal through the at least one configured antenna.
    Type: Application
    Filed: March 29, 2017
    Publication date: May 7, 2020
    Inventors: Steven Ferrante, Fengjun Xi, Rui Yang, Chunxuan Ye, Kyle Jung-Lin Pan
  • UPLINK BEAM MANAGEMENT
    Publication number: 20200136708
    Abstract: Systems, methods and instrumentalities are disclosed for uplink beam management. A wireless transmit/receive unit (WTRU) may send a beam correspondence indication to a network device. The beam correspondence indication may indicate a beam correspondence associated with one or more receive beams and one or more transmit beams of the WTRU. The WTRU may determine an uplink time synchronization status associated with the WTRU. The uplink time synchronization status may indicate whether the WTRU is uplink time synchronized. The WTRU may receive, from the network device, a reference signal type in accordance with the determined uplink time synchronization status. The WTRU may receive, from the network device, a beam management indication in response to the beam correspondence indication. The WTRU may perform an uplink beam management based on the received beam management indication.
    Type: Application
    Filed: February 2, 2018
    Publication date: April 30, 2020
    Applicant: IDAC Holdings, Inc.
    Inventors: Kyle Jung-Lin Pan, Fengjun Xi, Chunxuan Ye
  • Systems and/or methods providing ePDCCH in a multiple carrier based and/or quasi-collated network
    Patent number: 10638457
    Abstract: ePDCCH may be provided. For example, a WTRU may receive a configuration for monitoring an ePDCCH resource. Based on the configuration, the WTRU may be configured to monitor and may monitor the ePDCCH resource on a particular subframe. Additionally, a WTRU may derive an aggregation level for a subframe associated with an aggregation level number NAL. The WTRU may transmit or monitor an ePDCCH using the aggregation level associated with the NAL for the subframe. A WTRU may also receive a reference signal. The WTRU may then determine the type of reference signal received. The WTRU may perform a demodulation of the PDSCH or ePDCCH using a demodulation timing based on the determined type. The ePDCCH or PDSCH may also be monitored or received by identifying a demodulation reference timing implicitly based on a location of one or more ePDCCH resources where the WTRU may receive DCI.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: April 28, 2020
    Assignee: INTERDIGITAL PATENT HOLDINGS, INC.
    Inventors: Moon-il Lee, Chang-Soo Koo, Sung-Hyuk Shin, Janet A. Stern-Berkowitz, Marian Rudolf, Fengjun Xi, Ananth Kini, Seyed Mohsen Hosseinian, Paul Marinier
  • POWER REDUCTION AND SCALING FOR MULTI-CARRIER WIRELESS TERMINALS
    Publication number: 20200120618
    Abstract: A wireless transmit/receive unit (WTRU) may utilize pre-configured rules for scaling power levels. Channels may be grouped based on a type of data to be transmitted. A power level of a channel from a group may be scaled using the pre-configured rules. A power level of a channel of a supplementary carrier may be scaled before another channel of a non-supplementary carrier.
    Type: Application
    Filed: December 9, 2019
    Publication date: April 16, 2020
    Applicant: InterDigital Patent Holdings, Inc.
    Inventors: Benoit Pelletier, Diana Pani, Joseph S. Levy, Fengjun Xi, Christopher Cave
  • PRACH ENHANCEMENT METHODS IN NR-U
    Publication number: 20200112996
    Abstract: Methods, devices, and systems for physical random access channel (PRACH) access. A WTRU transmits a message to a gNB. The message includes a PRACH preamble from a first set. The method also includes performing a hidden node detection procedure prior to a random access response (RAR) window. The RAR window corresponds to the transmitted message. The method also includes attempting to receive a RAR in response to the transmitted message, during the RAR window. The method also includes retransmitting the message to the gNB, including a PRACH preamble from a second set, if the RAR is not received during the RAR window and a hidden node is detected; and retransmitting the message to the gNB, including a PRACH preamble from the first set, if the RAR is not received during the RAR window and the hidden node is not detected.
    Type: Application
    Filed: October 8, 2019
    Publication date: April 9, 2020
    Inventors: Kyle Jung-Lin Pan, Fengjun Xi
  • Reference signal configuration for extension carriers and carrier segments
    Patent number: 10616022
    Abstract: Reference signals configured for use with extension carriers and/or carrier segments are described. Reference signals for extension carriers and/or carrier segments may include demodulation reference signals (e.g., user equipment-specific reference signals), cell-specific reference signals, and channel-state information reference signals. Methods, systems and apparatuses for configuring extension carriers and/or carrier segments with one or more of the reference signals (e.g., positioning one or more reference signal symbols in extension carriers and/or carrier segments) are described.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: April 7, 2020
    Assignee: InterDigital Patent Holdings, Inc.
    Inventors: Sung-Hyuk Shin, Changsoo Koo, Fengjun Xi, Moon-il Lee, Janet A. Stern-Berkowitz, Ghyslain Pelletier
  • ENHANCED ACCESS LINK FOR IAB IN NR
    Publication number: 20200100298
    Abstract: In an integrated access and backhaul (IAB) system, an access WTRU may receive a random access channel (RACH) occasion (RO) configuration comprising one or more RO resources from a first integrated access backhaul (IAB) node. The access WTRU may receive an indication that one or more of the configured RO resources have an overlap with one or more IAB node RO resources. The access WTRU may monitor and receive the ROI indicating the configured RO resources that overlap with the one or more IAB node RO resources. Based on the received ROI and the configured RO resources, the access WTRU may determine one or more RO resources available for PRACH transmission. The access WTRU may select an RO resource from the available RO resources for PRACH transmission. The access WTRU may send a first PRACH transmission to the first IAB node using the selected RO resource.
    Type: Application
    Filed: September 26, 2019
    Publication date: March 26, 2020
    Applicant: IDAC Holdings, Inc.
    Inventors: Kyle Jung-Lin Pan, Fengjun Xi