Patents by Inventor Liwen Chu

Liwen Chu 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: 10212730
    Abstract: Systems and techniques relating to partial AID length change notification include: transmitting, to one or more wireless devices within a wireless communication system, a first frame including an indication of a partial association identifier (AID) length and an indication of a target time at which the one or more wireless devices within the wireless communication system will utilize the indicated partial AID length; and transmitting, to the one or more wireless devices within a wireless communication system, one or more additional frames before the target time is reached, where each of the one or more additional frames include the indication of the partial AID length and the indication of the target time.
    Type: Grant
    Filed: April 14, 2017
    Date of Patent: February 19, 2019
    Assignee: Marvell International Ltd.
    Inventors: Liwen Chu, Yakun Sun, Lei Wang, Jinjing Jiang, Hongyuan Zhang, Hui-Ling Lou
  • Publication number: 20190052428
    Abstract: A first communication device prompts a plurality of second communication devices to transmit, during a contiguous time period reserved for a range measurement exchange, respective first null data packets (NDPs) at respective times. The first communication device receives first NDPs from at least some of the second communication devices during the contiguous time period, and transmits one or more second NDPs to the plurality of second communication devices. The first communication device uses reception of the first NDPs and transmission of the one or more second NDPs to determine respective ranges between the first communication device and respective second communication devices.
    Type: Application
    Filed: August 3, 2018
    Publication date: February 14, 2019
    Inventors: Liwen CHU, Hongyuan ZHANG, Christian R. BERGER, Niranjan GRANDHE, Sudhir SRINIVASA, Hui-Ling LOU
  • Publication number: 20190045513
    Abstract: An access point generates and transmits, to first client stations and a second client station, a downlink multi-user (MU) physical layer (PHY) data unit having respective media access control (MAC) data units for i) the first client stations and ii) the second client station. The downlink MU PHY data unit includes an indication that the first client stations are to acknowledge the downlink MU PHY data unit in an uplink MU PHY data unit, and indicates that the second client station is to acknowledge the downlink MU PHY data unit in another uplink PHY data unit separate from the uplink MU PHY data unit. The access point receives, from the multiple first client stations, the uplink MU PHY data unit, and polls the second client station to prompt the second client station to acknowledge, in another uplink PHY data unit, that the second client station received the downlink MU PHY data unit.
    Type: Application
    Filed: October 8, 2018
    Publication date: February 7, 2019
    Inventors: Liwen CHU, Hongyuan ZHANG, Lei WANG, Hui-Ling LOU, Jinjing JIANG
  • Patent number: 10201009
    Abstract: A channel access timer at a communication device is set to a duration for which a shared communication medium is expected to be busy in a basic service set (BSS) heard by the communication device. The channel access timer is counted down. Before the channel access timer reaches zero, respective indications of respective contention free period durations in multiple basic service sets (BSSs) heard by the communication device are recorded in a BSS record maintained by the communication device. Recording the respective indications includes recording, for each particular BSS of the multiple BSSs, (i) an identifier of the particular BSS and (ii) an offset value corresponding to an offset of an end of a contention free period in the particular BSS from an end of a contention free period in the BSS based on which the channel access timer is currently set at the communication device.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: February 5, 2019
    Assignee: Marvell International Ltd.
    Inventors: Lei Wang, Liwen Chu, Jinjing Jiang, Yakun Sun, Hongyuan Zhang, Hui-Ling Lou
  • Patent number: 10194385
    Abstract: In aspects of acknowledgement options for downlink multi-user transmission, a wireless network system includes an access point that can communicate a downlink multi-user transmission soliciting acknowledgement from one or more station devices. The access point can receive an association request or an operation mode change request frame from one or more of the station devices, and determine an acknowledgement option for each of the station devices that communicate the request to the access point. The access point can then use a multi-user transmission mode or a single user transmission mode for each of the station devices based on the acknowledgement option determined for each of the respective station devices.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: January 29, 2019
    Assignee: Marvell International Ltd.
    Inventors: Jinjing Jiang, Liwen Chu, Lei Wang, Yakun Sun, Hongyuan Zhang
  • Patent number: 10194268
    Abstract: A first communication device determines scheduling information for a plurality of range measurement signal exchange sessions between the first communication device and one or more second communication devices, wherein the plurality of range measurement signal exchange sessions involve using at least one of i) different channel bandwidths, and ii) different physical layer data unit (PPDU) formats for the plurality of range measurement signal exchange sessions. The first communication device transmits a single packet that includes scheduling information so that a third communication device can use the scheduling information to observe one or more of the range measurement signal exchange sessions in the plurality of range measurement signal exchange sessions between the first communication device and one or more second communication devices, to determine range measurements.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: January 29, 2019
    Assignee: Marvell International Ltd.
    Inventors: Liwen Chu, Sagar A. Tamhane, Hongyuan Zhang, Hui-Ling Lou, Kwok Shum Au
  • Patent number: 10187497
    Abstract: Embodiments described herein provide a method for providing a physical-layer control mechanism in accordance with a wireless local area network communication protocol allowing a high data rate. At a wireless receiver, a physical-layer data frame may be received compliant with the wireless local area network communication protocol. When the physical-layer data frame includes only one data unit, a length of an enhanced directional multi-gigabit header from a header associated with the physical-layer data frame may be obtained, and the enhanced directional multi-gigabit header from the physical-layer data frame may be enhanced based on the length. When the physical-layer data frame includes more than one data unit, a first length of a first data unit may be obtained from a first header associated with the first data unit, and the first data unit may be identified from the data frame based on the first length.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: January 22, 2019
    Assignee: Marvell International Ltd.
    Inventors: Yakun Sun, Hongyuan Zhang, Lei Wang, Liwen Chu, Jinjing Jiang, Hui-Ling Lou
  • Patent number: 10187905
    Abstract: Systems and techniques relating to wireless networking, and target wake time (TWT) scheduling for transmissions employing an Orthogonal Frequency-Division Multiple Access (OFDMA) digital modulation channelization include: receiving a frame at a wireless device, wherein a format of the frame comprises (i) a field indicating a target wake time, (ii) a first subfield having a first value that indicates a digital modulation channelization scheme, and (iii) a second subfield having a second value that indicates a transmission direction; and powering on the wireless device at the target wake time indicated by the field in the frame, wherein the powering on the wireless device enables the wireless device to transmit additional frames via a wireless channel based on (i) the first value set in the first subfield of the frame and (ii) the second value set in the second subfield of the frame.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: January 22, 2019
    Assignee: Marvell World Trade Ltd.
    Inventors: Liwen Chu, Lei Wang, Hongyuan Zhang, Jinjing Jiang, Hui-Ling Lou
  • Patent number: 10182399
    Abstract: Systems and techniques relating to wireless networking, namely employing power management (PM) indication mechanisms in addition to ROM indication mechanisms so as to support ROM related outage period enhancements, include: transmitting a first data frame, wherein a format of the first data frame comprises: (i) a field indicating a change in receive operation mode (ROM) settings, and (ii) a subfield having a value indicating a power management mode of the wireless device; receiving an acknowledgement frame to enable a power management mode associated with the subfield in the first frame, the acknowledgement frame having been transmitted by a second wireless device in response to receiving the first frame by the second wireless device, wherein the power management mode delays transmission of additional frames to the first wireless device until receiving a second data frame having a value indicating a change in the power management mode.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: January 15, 2019
    Assignee: Marvell International Ltd.
    Inventors: Liwen Chu, Chor-Teck Law, Hongyuan Zhang, Hui-Ling Lou
  • Patent number: 10178673
    Abstract: Systems and techniques relating to wireless communications are described. A described technique includes transmitting a signal to cause wireless devices to concurrently transmit sounding packets on different subcarriers within a frequency band during a multi-user uplink transmission; receiving, concurrently, sounding packets from the wireless devices on the different subcarriers within the frequency band during the multi-user uplink transmission; determining subcarrier channel qualities based on the sounding packets; and assigning the subcarriers among the wireless devices for a subsequent multi-user uplink transmission based on the subcarrier channel qualities.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: January 8, 2019
    Assignee: MARVELL INTERNATIONAL LTD.
    Inventors: Jinjing Jiang, Liwen Chu, Yakun Sun, Lei Wang, Hongyuan Zhang
  • Publication number: 20190007251
    Abstract: A first communication device transmits a null data packet (NDP) to multiple second communication devices. The NDP spans a channel frequency bandwidth. The first communication device receives a plurality of sounding feedback packets from the second communication devices. Each sounding feedback packet includes one or more signal-to-noise ratio (SNR) indicators corresponding to one or more respective groups of orthogonal frequency division multiplexing (OFDM) subcarriers, and the SNR indicators correspond to reception of the NDP at the plurality of second communication devices. Each sounding feedback packet in the plurality of sounding feedback packets includes a respective indication of OFDM subcarriers for which the sounding feedback packet includes SNR information, and at least one sounding feedback packet from among the plurality of sounding feedback packets does not include SNR information for all OFDM subcarriers via which the NDP was transmitted.
    Type: Application
    Filed: September 10, 2018
    Publication date: January 3, 2019
    Inventors: Hongyuan ZHANG, Yakun SUN, Hui-Ling LOU, Liwen CHU
  • Patent number: 10164695
    Abstract: A method is described. A block allocation that indicates a plurality of contiguous tone blocks of a wireless local area network communication channel is selected for a multi-user, multiple input multiple output (MU-MIMO) orthogonal frequency division multiple access (OFDMA) data unit. A contiguous tone block corresponds to a respective device set having at least one communication device. Respective spatial stream allocations are selected, for at least some of the blocks, that indicate a number of spatial streams for the corresponding block of the data unit. The number of streams of a block is equal to a number of communication devices of the device set that corresponds to the block. A first field is encoded and transmitted to indicate the selected block allocation and the selected spatial stream allocations. A second field is encoded and transmitted to indicate a respective device identifier for each communication device of the respective device sets.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: December 25, 2018
    Assignee: Marvell World Trade Ltd.
    Inventors: Yakun Sun, Hongyuan Zhang, Liwen Chu, Lei Wang, Hui-Ling Lou, Jinjing Jiang
  • Patent number: 10153857
    Abstract: A method for simultaneous communication in a wireless local area network is described. A first control frame is transmitted by a first communication device to a plurality of communication devices, is duplicated across each of a plurality of sub-channels of an orthogonal frequency division multiplexing channel, and indicates that the communication devices are requested to simultaneously transmit respective control frames to the first communication device. Respective control frames are received, including second and third control frames from second and third communication devices, respectively, that are transmitted via a same sub-channel having a smallest bandwidth of the wireless local area network and indicate that at least some of the plurality of sub-channels are available. One of an orthogonal frequency division multiple access data unit and a duplicated legacy data unit is transmitted by the first communication device in response to the control frames via the available sub-channels.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: December 11, 2018
    Assignee: Marvell International Ltd.
    Inventors: Liwen Chu, Lei Wang, Hongyuan Zhang, Hui-Ling Lou, Jinjing Jiang
  • Patent number: 10148412
    Abstract: A controller of a first communication device records a first time value of a first clock corresponding to transmission of a first communication frame associated with a timing measurement procedure. If an acknowledgment of the first communication frame was received by the first communication device, the controller records a second time value of the first clock. The controller receives a data unit corresponding to a second communication frame associated with the timing measurement procedure, wherein the data unit includes a time value of a second clock. If an acknowledgment of the first communication frame was not received, the controller compares the first time value of the first clock to the time value of the second clock, and uses i) the first time value of the first clock, and ii) the time value of the second clock to adjust time values corresponding to the first clock responsive to the comparison.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: December 4, 2018
    Assignee: Marvell International Ltd.
    Inventors: Liwen Chu, Sagar A. Tamhane, Hongyuan Zhang, Hui-Ling Lou
  • Patent number: 10142960
    Abstract: A first communication i) selects one or more respective preliminary identifiers (IDs) for one or more second communication devices, or ii) receives one or more respective preliminary IDs from one or more second communication devices, the one or more respective preliminary IDs having been respectively selected by the one or more second communication devices. The first communication device generates a trigger frame, the trigger frame indicating one or more first frequency resource and/or spatial stream allocations to one or more second communication devices using the one or more respective preliminary IDs. The first communication device transmits the trigger frame to initiate at least an uplink (UL) MU transmission by multiple second communication devices for a ranging procedure.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: November 27, 2018
    Assignee: Marvell World Trade Ltd.
    Inventors: Liwen Chu, Sagar A. Tamhane, Christian R. Berger, Niranjan Grandhe, Hongyuan Zhang, Hui-Ling Lou
  • Patent number: 10135582
    Abstract: Systems and methods are provided for introducing time diversity in a transmitter. The systems and methods may include receiving, at the transmitter, a request from a receiver to retransmit data. The systems and methods may further include receiving an input of data corresponding to the data requested for retransmission at a first transmitter block. The systems and methods may further include operating on the signals using the first transmitter block in at least one of a first mode and a second mode, such that an output of signals from the first transmitter block is dependent on a time-varying function and corresponds to the data requested by the receiver for retransmission.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: November 20, 2018
    Assignee: Marvell International Ltd.
    Inventors: Yakun Sun, Hongyuan Zhang, Liwen Chu, Hui-Ling Lou
  • Publication number: 20180332502
    Abstract: A method for communicating an acknowledgment policy for a data unit in a wireless local area network is described. A plurality of medium access control (MAC) protocol data units (MPDUs) of an aggregate MPDU intended for a second communication device are generated. A plurality of MPDU delimiters are generated, each MPDU delimiter of the plurality of MPDU delimiters indicating an acknowledgment policy for a corresponding MPDU of the plurality of MPDUs. At least two MPDUs of the plurality of MPDUs correspond to MPDU delimiters that indicate an acknowledgment policy corresponding to a single acknowledgment frame for the corresponding MPDUs. The aggregate MPDU is generated to include the plurality of MPDUs and the plurality of MPDU delimiters. The aggregate MPDU is caused to be transmitted from the first communication device to the second communication device.
    Type: Application
    Filed: July 24, 2018
    Publication date: November 15, 2018
    Inventors: Liwen CHU, Hongyuan ZHANG, Hui-Ling LOU
  • Patent number: 10128966
    Abstract: Aspects of the disclosure provide an apparatus for wireless communication. The apparatus includes a transceiver and a processing circuit. The transceiver is configured to transmit and receive wireless signals. The processing circuit is configured to determine a transmission parameter adjustment for the transceiver, detect that the transmission parameter adjustment has a potential to cause a collision to an overlapping basic service set (OBSS), adjust timings for transmission control to avoid the collision, and control the transceiver based on the determined transmission parameter adjustment and the adjusted timings for transmission control.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: November 13, 2018
    Assignee: MARVELL INTERNATIONAL LTD.
    Inventors: Liwen Chu, Lei Wang, Jinjin Jiang, Hongyuan Zhang, Hui-Ling Lou
  • Publication number: 20180323919
    Abstract: A communication device generates a physical layer (PHY) preamble of a multi-user (MU) PHY data unit. The PHY preamble includes a first signal field, and a second signal field. The second signal field includes: a common field that includes a value, selected from a codebook, that indicates i) an allocation of frequency resources to one or more resource units, wherein each resource unit corresponds to a respective block of consecutive orthogonal frequency division multiplexing (OFDM) tones, and ii) a respective number of receiving devices assigned to each resource unit. The second signal field also includes a plurality of user-specific fields that indicate an allocation of the one or more resource units to the multiple receiving devices, wherein each user-specific field corresponds to a respective receiving device and includes i) an identifier of the respective receiving device, and ii) an indication of which one or more spatial streams are allocated to the respective receiving device.
    Type: Application
    Filed: July 16, 2018
    Publication date: November 8, 2018
    Inventors: Yakun SUN, Hongyuan ZHANG, Liwen CHU, Lei WANG, Jinjing JIANG, Mingguang XU
  • Publication number: 20180324638
    Abstract: A first communication device receives one or more aggregate medium access control (MAC) data units from respective one or more second communication devices. Respective aggregate MAC data units include multiple MAC data units from respective ones of the one or more second communication devices. The first communication device generates one or more acknowledgement information fields, including a first acknowledgement information field corresponding to a particular second communication device includes i) a length indication that indicates a length of an acknowledgement field, and ii) the acknowledgment field of the indicated length. The acknowledgement field includes respective acknowledgement information for at least some of the multiple MAC data units received from the particular second communication device.
    Type: Application
    Filed: July 18, 2018
    Publication date: November 8, 2018
    Inventors: Liwen CHU, Hongyuan ZHANG, Hui-Ling LOU