Patents by Inventor Jianhan Liu

Jianhan Liu 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).

  • Subcarrier Indices For Distributed-Tone Resource Units In 6GHz Low-Power Indoor Systems
    Publication number: 20220140988
    Abstract: Various schemes pertaining to subcarrier indices for distributed-tone resource units (RUs) in 6 GHz low-power indoor (LPI) systems are described. A communication entity distributes frequency tones of a RU over a distribution bandwidth as a distributed-tone RU (dRU). The communication entity also generates generating a plurality of subcarrier indices for the distributed-tone RU such that a distribution of the distributed-tone RU is symmetric or asymmetric to a direct-current (DC) tone along an axis of subcarrier indices. The communication entity then communicates wirelessly using the distributed-tone RU in a 6 GHz LPI system.
    Type: Application
    Filed: October 27, 2021
    Publication date: May 5, 2022
    Inventors: Shengquan Hu, Jianhan Liu, Thomas Edward Pare, JR.
  • RETRANSMISSION SCHEMES BASED ON LLR COMBINING IN WLAN
    Publication number: 20220132367
    Abstract: Embodiments of the present invention provide a method and apparatus for enhanced data retransmission based on log-likelihood ratio (LLR) combining in WLAN. According to some embodiments, packets can be retransmitted using a modified transmission scheme. Codewords are associated with cyclic redundancy checks (CRCs) for detecting errors, and a subsequent packet is received that includes data that can be used to correct the error. For example, each packet can be encoded for both error detection and correction, and the retransmission mechanism can be adapted to the error rate. The retransmission scheme is improved by utilizing an LLR combining scheme, transmit diversity, and modified ACK methods.
    Type: Application
    Filed: January 5, 2022
    Publication date: April 28, 2022
    Inventors: Jianhan LIU, Yongho SEOK, Chung-ta KU, Thomas Edward PARE, JR.
  • Efficient Trigger-Based Multi-User Uplink Transmissions In Wireless Local Area Networks
    Publication number: 20220132351
    Abstract: Various examples pertaining to efficient trigger-based (TB) multi-user (MU) uplink (UL) transmissions in wireless local area networks (WLANs) are described. A stations (STA) receives a trigger frame from an access point (AP), with the trigger frame assigning one or more resource units (RUs) corresponding to one or more subchannels of a plurality of subchannels. The STA then performs a transmission using the assigned one or more RUs responsive to receiving the trigger frame. In an event that at least one subchannel of the plurality of subchannels is detected as being busy, the one or more subchannels may include a subset (e.g., some but not all) of the plurality of subchannels.
    Type: Application
    Filed: October 20, 2021
    Publication date: April 28, 2022
    Inventors: Jianhan Liu, Shengquan Hu, Yongho Seok, Thomas Edward Pare, JR., Kai Ying Lu
  • Joint Encoding Schemes With Interleaver And Tone Mapper For Multi-RU Operation
    Publication number: 20220116136
    Abstract: A method of joint encoding schemes with interleaver and tone mapper for multiple-resource unit (multi-RU) operation involves performing joint encoding of a plurality of information bits to generate a plurality of encoded bit sequences. The method also involves processing the plurality of encoded bit sequences by interleaving and tone mapping the encoded bit sequences with respect to a plurality of resource units (RUs) on either or both of an aggregate-RU basis and an individual-RU basis to generate a plurality of processed bit sequences. The method further involves transmitting the plurality of processed bit sequences over the plurality of RUs.
    Type: Application
    Filed: December 21, 2021
    Publication date: April 14, 2022
    Inventors: Shengquan Hu, Jianhan Liu, Shuling Feng, Thomas Edward Pare, JR.
  • Encoding And Transmit Power Control For Downsized Uplink Trigger-Based PPDU Transmissions In Next-Generation WLAM Systems
    Publication number: 20220116885
    Abstract: Various schemes pertaining to encoding and transmit power control for downsized trigger-based (TB) physical-layer protocol data unit (PPDU) transmissions in next-generation WLAN systems are described. A station (STA) receives a trigger frame indicating an allocated resource unit (RU) of a first size. The STA performs channel sensing responsive to receiving the trigger frame. In response to detecting at least one subchannel being busy from the channel sensing, the STA performs a downsized trigger-based (TB) transmission with a downsized RU or multi-RU (MRU) of a second size smaller than the first size by utilizing downsized RU or MRU allocation information while maintaining a value of each of one or more parameters unchanged in an encoding process to perform the downsized TB transmission.
    Type: Application
    Filed: October 4, 2021
    Publication date: April 14, 2022
    Inventors: Shengquan Hu, Jianhan Liu, Thomas Edward Pare, JR.
  • Multi-link operation setup and channel access control
    Patent number: 11272536
    Abstract: Embodiments of the present invention provide a method and apparatus for simultaneous transmission and reception of data wirelessly using different wireless bands. The multi-link operations described herein can provide higher network throughput and improved network flexibility compared to traditional techniques to wireless communication. Embodiments of the present invention support joint or independent transmission of data over different links, and a full duplex connection can be enabled by independent multi-band operation e.g., a frequency division duplex mode.
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: March 8, 2022
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Yongho Seok, Jianhan Liu, Gabor Bajko, James Chih-Shi Yee
  • Group-based unequal MCS schemes for a single user station in WLAN transmissions
    Patent number: 11265048
    Abstract: Systems and methods of transmitting a PPDU to or from a single user station (STA) in an MIMO transmission by using unequal MCSs. An access point (AP) allocates a plurality of spatial streams to the STA and assigned them into groups for the MIMO transmission. Multiple unequal MCSs are assigned to the different spatial stream groups. Correspondingly the STA ID is repeatedly specified in the user block fields of a SIG-B field of a downlink PPDU, or in the user information fields of a trigger frame. Alternatively, multiple AIDs of the STA can be specified in the user block fields or the user information fields instead of repeating the same STA ID. An indication may be inserted in the SIG-A field to indicate that the grouped-based unequal MCSs scheme is used for the MIMO transmission.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: March 1, 2022
    Assignee: Mediatek Singapore PTE. LTD.
    Inventors: Jianhan Liu, Shengquan Hu, Yongho Seok, Thomas Edward Pare, Jr., Yungping Hsu
  • Sounding Schemes Using Distributed Tones In Wireless Communications
    Publication number: 20220052809
    Abstract: Various examples pertaining to sounding schemes using distributed tones in wireless communications are described. A stations (STA) receives a sounding signal with an extremely-high-throughput (EHT) null data packet (NDP). The STA then transmits a feedback regarding the sounding signal on a distributed-tone resource unit (DT-RU).
    Type: Application
    Filed: August 8, 2021
    Publication date: February 17, 2022
    Inventors: Jianhan Liu, Shengquan Hu, Yongho Seok, Kai Ying Lu, Thomas Edward Pare, JR.
  • Virtual resource unit for multi-resource unit assignment to a single station in WLAN
    Patent number: 11252749
    Abstract: Embodiments of the present invention can assign multiple resource units (RUs) to a single wireless station using an aggregated Multi-RU (“virtual resource unit” or “vRU”) that aggregates multiple RUs, and the parameters of the virtual RU can be calculated according to existing standards such the padding schemes and RUs (e.g., RU26, RU52, RU106, RU242, RU484, RU996, RU2x996) defined in IEEE 802.11ax. The virtual RU parameters used for joint encoding can be directly calculated based on formulas described herein according to embodiments of the present invention, and according to values obtained from pre-defined tables.
    Type: Grant
    Filed: May 21, 2020
    Date of Patent: February 15, 2022
    Assignee: Mediatek Singapore PTE. LTD.
    Inventors: Shengquan Hu, Jianhan Liu, Thomas Edward Pare, Jr.
  • Retransmission schemes based on LLR combining in WLAN
    Patent number: 11252603
    Abstract: Embodiments of the present invention provide a method and apparatus for enhanced data retransmission based on log-likelihood ratio (LLR) combining in WLAN. According to some embodiments, packets can be retransmitted using a modified transmission scheme. Packets that are received with an error are stored, and a subsequent packet is received that includes data that can be used to correct the error. For example, each packet can be encoded for both error detection and correction, and the retransmission mechanism can be adapted to the error rate. The retransmission scheme is improved by utilizing an LLR combining scheme, transmit diversity, and modified ACK methods.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: February 15, 2022
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Jianhan Liu, Yongho Seok, Chung-Ta Ku, Thomas Edward Pare, Jr.
  • Null Data Packet Sounding for Preamble Puncture Techniques
    Publication number: 20220045725
    Abstract: Null Data Packet Sounding for preamble punctured Physical Layer Convergence Procedure Protocol Data Unit (PPDU) for efficient use of a wireless channel bandwidth where a primary service co-exists.
    Type: Application
    Filed: October 22, 2021
    Publication date: February 10, 2022
    Inventors: Yongho Seok, Jianhan Liu, Chao-Chun Wang, James Chih-Shi YEE
  • Signaling Of Punctured Sub-Channels In Wireless Communications
    Publication number: 20220045788
    Abstract: Various examples pertaining to signaling of punctured sub-channels in wireless communications are described. A puncturing pattern is signaled with an extremely-high-throughput (EHT) physical-layer protocol data unit (PPDU). A first station (STA) and a second STA then communicate with each other based on the signaled puncturing pattern.
    Type: Application
    Filed: August 2, 2021
    Publication date: February 10, 2022
    Inventors: Jianhan Liu, Shengquan Hu, Thomas Edward Pare, JR.
  • Design Simplification For Distributed-Tone Resource Units In 6GHz Low-Power Indoor Systems
    Publication number: 20220038250
    Abstract: Various schemes pertaining to design simplification for distributed-tone resource units (RUs) in 6 GHz low-power indoor (LPI) systems are described. A communication entity performs tone distribution with a logical RU size over a bandwidth to generate a distributed-tone RU. The communication entity then communicates wirelessly using the distributed-tone RU in a 6 GHz low-power indoor (LPI) system.
    Type: Application
    Filed: July 27, 2021
    Publication date: February 3, 2022
    Inventors: Shengquan Hu, Jianhan Liu, Thomas Edward Pare, JR.
  • Joint encoding schemes with interleaver and tone mapper for multi-RU operation
    Patent number: 11239940
    Abstract: A method of joint encoding schemes with interleaver and tone mapper for multiple-resource unit (multi-RU) operation involves performing joint encoding of a plurality of information bits to generate a plurality of encoded bit sequences. The method also involves processing the plurality of encoded bit sequences by interleaving and tone mapping the encoded bit sequences with respect to a plurality of resource units (RUs) on either or both of an aggregate-RU basis and an individual-RU basis to generate a plurality of processed bit sequences. The method further involves transmitting the plurality of processed bit sequences over the plurality of RUs.
    Type: Grant
    Filed: September 16, 2020
    Date of Patent: February 1, 2022
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Shengquan Hu, Jianhan Liu, Shuling Feng, Thomas Edward Pare, Jr.
  • Wide Bandwidth Transmission Schemes
    Publication number: 20220030450
    Abstract: An access point (AP) and a station (STA) communicate with each other, with the AP indicating to the STA either or both of a preamble detection (PD) channel and a signaling (SIG) content channel and with the STA being initially monitoring a primary frequency segment of a plurality of frequency segments in an operating bandwidth of the AP. A downlink (DL) or triggered uplink (UL) communication is performed between the AP and the STA during a transmission opportunity (TXOP) such that: (i) during the TXOP, the STA monitors a preamble on the PD channel and decodes a SIG content on the SIG content channel; and (ii) after an end of the TXOP, the STA switches to the primary frequency segment.
    Type: Application
    Filed: July 21, 2021
    Publication date: January 27, 2022
    Inventors: Kai Ying Lu, Yongho Seok, Hung-Tao Hsieh, Cheng-Yi Chang, James Chih-Shi Yee, Jianhan Liu, Po-Yuen Cheng
  • Low PAPR Duplicated Dual Carrier Modulation For BPSK In Wireless Communications
    Publication number: 20220014406
    Abstract: Dual carrier modulation (DCM) encoded data is generated in a first half of a full signal bandwidth. The DCM encoded data generated in the first half of the full signal bandwidth is duplicated in a second half of the full signal bandwidth. The duplicated DCM encoded data in the second half of the full signal bandwidth is multiplied by a modulation vector to result in a reduced peak-to-average power ratio (PAPR) in transmission.
    Type: Application
    Filed: July 5, 2021
    Publication date: January 13, 2022
    Inventors: Gary A. Anwyl, Jianhan Liu, Shengquan Hu, Thomas Edward Pare, JR.
  • Bandwidth Extension Indication And Negotiation In Wireless Communications
    Publication number: 20210400727
    Abstract: A first station (STA) and a second STA perform bandwidth negotiation with a bandwidth extension indication. Then the first STA and the second STA communicate wirelessly according to the bandwidth negotiation.
    Type: Application
    Filed: June 17, 2021
    Publication date: December 23, 2021
    Inventors: Kai Ying Lu, Yongho Seok, James Chih-Shi Yee, Chao-Chun Wang, Jianhan Liu
  • METHODS AND DEVICES FOR TONE DISTRIBUTION FOR LOW POWER TRANSMISSIONS IN A WIRELESS NETWORK
    Publication number: 20210400670
    Abstract: Accordingly, embodiments of the present invention provide methods and devices for low power transmissions that provide improved wireless coverage for 6 GHz LPI transmissions using novel tone mapping techniques. Resource units (RUs) tones are distributed over larger bandwidths to achieve higher transmission power while operating within the PSD requirements of LPI. The tone distribution can include global tone mapping of smaller RUs distributed onto larger bandwidths, or group-based tone distribution methods, for example.
    Type: Application
    Filed: June 16, 2021
    Publication date: December 23, 2021
    Inventors: Shengquan Hu, Jianhan Liu, Gary A. Anwyl, Thomas Edward Pare, Jr.
  • Efficient Resource Unit Allocation Signaling In Extreme-High-Throughput Wireless Communications
    Publication number: 20210392644
    Abstract: An extreme-high-throughput (EHT) physical-layer protocol data unit (PPDU) is signaled between a first station (STA) and a second STA to indicate a resource unit (RU) allocation with respect to multiple users. One or more RU allocated to the first STA or the second STA as indicated in the EHT PPDU can be determined by using a RU allocation table that includes, in addition to entries corresponding to RUs allocatable to a plurality of users, one or more empty RU entries corresponding to one or more of an empty 242-tone RU, an empty 484-tone RU and an empty 996-tone RU.
    Type: Application
    Filed: June 14, 2021
    Publication date: December 16, 2021
    Inventors: Jianhan Liu, Shengquan Hu, Thomas Edward Pare, JR.
  • Long-Range Transmission And Reception For Low-Power Indoor Applications In 6-GHz Band
    Publication number: 20210385688
    Abstract: A wireless communication link is established between a first station (STA) and a second STA in a 6-GHz band. The first STA and the second STA the communicate in the 6-GHz band using a low-power indoor (LPI) long range (LR) physical-layer protocol data unit (PPDU). The LPI LR PPDU includes a legacy preamble, a universal signal field (U-SIG), an extreme-high-throughput signal field (EHT-SIG), an extreme-high-throughput short training field (EHT-STF), an extreme-high-throughput long training field (EHT-LTF), and a payload. Each of the legacy preamble, U-SIG and EHT-SIG is modulated and duplicated over multiple 20-MHz subchannels for a 80-MHz, 160-MHz or 320-MHz bandwidth over which the LPI LR PPDU is transmitted. Each of the EHT-STF, EHT-LTF and payload is modulated and transmitted on an entirety of the 80-MHz, 160-MHz or 320-MHz bandwidth.
    Type: Application
    Filed: May 28, 2021
    Publication date: December 9, 2021
    Inventors: Jianhan Liu, Shengquan Hu, Hsuan-Yu Liu, Thomas Edward Pare, JR., Yungping Hsu