Patents by Inventor Chih-Shi Yee

Chih-Shi Yee 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: 20210250848
    Abstract: Embodiments of the present invention provide apparatus and methods for announcing a BSS parameter updates for a wireless link that can be received by a MLD even when the MLD is not listening for parameter updates on that specific link by employing a different wireless link to broadcast, receive, and/or signal the BSS parameter update. An MLD can update the BSS parameters of the wireless link and use the wireless link according to the updated BSS parameters (e.g., after performing a channel switch). According to some embodiments, an STA within an AP MLD transmits an information elements (IE) including BSS parameter updates associated with a different STA (operating on a different wireless link) within the AP MLD.
    Type: Application
    Filed: February 3, 2021
    Publication date: August 12, 2021
    Inventors: Yongho SEOK, Kai Ying LU, James Chih-Shi YEE
  • Publication number: 20210250963
    Abstract: Multi-link operations can provide higher network throughput and improved network flexibility compared to traditional techniques for wireless communication. Embodiments of the present invention provide a method of frame transmission that prevents constrained MLDs from transmitting and receiving frames on multiple links simultaneously using a novel and reliable group addressed frame transmission schedule for constrained MLDs. Group addressed frames are frames that are transmitted to several devices (e.g., broadcast) listening on a wireless link. It is important to carefully schedule group addressed frames for reception by MLDs to prevent IDC interference. According to some embodiments, group addressed frames are only transmitted when all MLDs listening on a wireless link are not transmitting data to prevent IDC interference.
    Type: Application
    Filed: February 3, 2021
    Publication date: August 12, 2021
    Inventors: Yongho SEOK, Kai Ying LU, James Chih-Shi YEE
  • Publication number: 20210243693
    Abstract: Systems and methods of transmitting a multi-user (MU) wake-up packet in FDMA. In the wake-up setup stage, an STA informs the AP that it can resolve an MU wake-up packet transmitted in FDMA. Accordingly, AP allocates a frequency channel to the STA in a WUR setup response frame which indicates a channel offset relative to the primary channel. Moreover, if a WUR channel allocated to an STA is inaccessible or there is on pending wake-up signal for the STA, no wake-up signal is included in the MU wake-up packet while any other accessible allocated channels may still be utilized for transmitting the scheduled wake-up signals. During such a transmission, an inaccessible channel may be punctured; and an accessible channel having no pending wake-up signal may be used to carry an invalid wake-up signal or a legacy preamble followed with no wake-up signal.
    Type: Application
    Filed: April 22, 2021
    Publication date: August 5, 2021
    Inventors: Yongho SEOK, Jianhan Liu, James Chih-Shi YEE, Thomas Edward PARE, JR.
  • Patent number: 11076425
    Abstract: System and method of using an AP to individually controlling RTS/CTS duration thresholds for multiple STAs in a WLAN. In response to a STA's association request, the AP determines a duration threshold specific to the STA and encloses this information in an association response for transmission to the STA. By using a broadcast frame, the AP may instruct multiple STAs to uniformly update their stored duration thresholds. For example, if the duration threshold field in the beacon frame is set to 0, the multiple STAs preserve their current duration thresholds; if the field is set to a non-zero value less than 1023, the multiple STAs all update their duration thresholds to the non-zero value; if this field is set to 1023, the multiple STAs disable the RTS/CTS transmissions based on the duration threshold. Based on a current threshold and pertinent policies, an STA can decide whether to initiate an RTS/CTS transmission sequence.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: July 27, 2021
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Yongho Seok, Chao-Chun Wang, James Chih-Shi Yee
  • Publication number: 20210211931
    Abstract: Embodiments of the present invention transmit fragmented frames using a sequence control field in a MAC header that includes an extended 15-bit sequence number for tracking the order of frames, and a 1-bit PF field that indicates the position of a fragmented frame in conjunction with a 1-bit MF field carried in a frame control subfield of the MAC header. The fragmented frames can be received by a wireless device and defragmented according to the MF field, the PF field, and the sequence control number. The frames can be discarded if any are not received successfully.
    Type: Application
    Filed: December 29, 2020
    Publication date: July 8, 2021
    Inventors: Yongho SEOK, Kai Ying LU, James Chih-Shi YEE
  • Publication number: 20210212118
    Abstract: A multi-link device (MLD) monitors each of first and second links in a multi-link operation in wireless communications, with the first link being a primary link and the second link being a secondary link. The MLD obtains a transmission opportunity (TXOP) on one of the first link and the second link as a result of performing a contention-based channel access on the first link and the second link. The MLD checks channel status of the other of the first link and the second link. The MLD then transmits one or more frames on the first link but not on the second link, on the second link but not on the first link, or on both the first link and the second link synchronously, responsive to the channel status of the other link given the TXOP being obtained on the one of the first link and the second link.
    Type: Application
    Filed: December 25, 2020
    Publication date: July 8, 2021
    Inventors: Kai Ying Lu, Yongho Seok, Weisung Tsao, James Chih-Shi Yee
  • Publication number: 20210168864
    Abstract: Embodiments of the present invention are drawn to electronic systems that perform EHT operations for a wireless network supporting a 160+160 MHz/320 MHz operating mode. RTS/CTS frame exchange sequences and TXOP truncation can be performed using punctured preambles according to subchannels indicated in a bitmap subfield (e.g., an Allowed Bitmap Subfield). Preamble puncturing is supported for EHT PPDUs transmitted to multiple STAs using MU-RTS/MU-CTS frames transmitted in non-HT duplicate PPDUs. Preamble puncturing is also supported for an EHT PPDU transmitted to a single STA. The RTS and CTS frames can be sent in a non-HT duplicate PPDU with preamble puncturing, for example.
    Type: Application
    Filed: November 24, 2020
    Publication date: June 3, 2021
    Inventors: Yongho SEOK, Kai Ying LU, James Chih-Shi YEE
  • Patent number: 11019568
    Abstract: Systems and methods of transmitting a multi-user (MU) wake-up packet in FDMA. In the wake-up setup stage, an STA informs the AP that it can resolve an MU wake-up packet transmitted in FDMA. Accordingly, AP allocates a frequency channel to the STA in a WUR setup response frame which indicates a channel offset relative to the primary channel. Moreover, if a WUR channel allocated to an STA is inaccessible or there is on pending wake-up signal for the STA, no wake-up signal is included in the MU wake-up packet while any other accessible allocated channels may still be utilized for transmitting the scheduled wake-up signals. During such a transmission, an inaccessible channel may be punctured; and an accessible channel having no pending wake-up signal may be used to carry an invalid wake-up signal or a legacy preamble followed with no wake-up signal.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: May 25, 2021
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Yongho Seok, Jianhan Liu, James Chih-Shi Yee, Thomas Edward Pare, Jr.
  • Publication number: 20210144589
    Abstract: Multi-link operations can provide higher network throughput and improved network flexibility compared to traditional techniques for wireless communication. Embodiments of the present invention provide techniques for simultaneously transmitting frames of an A-MSDU over multiple links in a multi-link operation between wireless devices (e.g., a wireless STA and a wireless AP). The A-MSDU can be aggregated to satisfy capability requirements of the transmitting device and/or the receiving device. Moreover, the A-MSDU can be fragmented, for example, to satisfy an MPDU length requirement of the transmitting device and/or the receiving device. Some embodiments disclosed herein use a virtual mac address of an LLC sublayer interface to define parameters values of an A-MSDU sub-frame header (e.g., SA and DA) for routing the respective frame to the LLC sublayer interface of the receiving device.
    Type: Application
    Filed: November 10, 2020
    Publication date: May 13, 2021
    Inventors: Yongho SEOK, Kai Ying LU, James Chih-Shi YEE, Gabor BAJKO
  • Publication number: 20210136819
    Abstract: Embodiments of the present invention prevent interference caused by the simultaneous transmission and reception of data in a constrained multi-link operation of a wireless network. According to one embodiment, first and second trigger frames are received from a wireless access point (AP) at a wireless station (STA) over first and second wireless links, respectively. First and second data frames are transmitted responsive to the first and second trigger frames over the first and second wireless links, respectively, when the difference between the ending time of the data frame transmitted responsive to the first trigger frame and the ending time of the second trigger frame is greater than a predetermined value to prevent interference.
    Type: Application
    Filed: October 28, 2020
    Publication date: May 6, 2021
    Inventors: Yongho Seok, James Chih-Shi Yee
  • Publication number: 20210127420
    Abstract: An apparatus capable of multi-link operations with respect to a first link and a second link obtains a second transmission opportunity (TXOP) on the second link after one other apparatus has started a first TXOP on the first link. The apparatus performs one or more transmissions during the second TXOP on the second link such that the second TXOP is at least partially synchronized with the first TXOP on the first link.
    Type: Application
    Filed: October 15, 2020
    Publication date: April 29, 2021
    Inventors: Kaiying Lu, James Chih-Shi Yee, Yongho Seok, Chao-Chun Wang, Thomas Edward Pare, JR.
  • Publication number: 20210120427
    Abstract: An apparatus implemented in a master access point (AP) selects at least one basic service set (BSS) from one or more neighbor BSSs to form a spatial reuse group (SRG). The apparatus then performs coordinated spatial reuse (CSR) in the SRG with a set of overlapping basic service set (OBSS) power detection (PD) parameters.
    Type: Application
    Filed: October 8, 2020
    Publication date: April 22, 2021
    Inventors: James June-Ming Wang, Chung-Ta Ku, Gabor Bajko, Gary A. Anwyl, Shuling Feng, Jianhan Liu, Yongho Seok, Po-Yuen Cheng, James Chih-Shi Yee, Thomas Edward Pare, JR.
  • Patent number: 10985862
    Abstract: A wireless communicating method includes: performing one resource unit allocation upon a channel; and allocating a first resource unit and a second resource unit in said one resource unit allocation to a station, wherein the first resource unit is different from the second resource unit. By using the wireless communication method, throughput rate can be improved.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: April 20, 2021
    Assignee: MEDIATEK INC.
    Inventors: Hung-Tao Hsieh, Tung Sheng Yang, Hsuan-Yu Liu, Kun-Chien Hung, YungPing Hsu, Jianhan Liu, Shengquan Hu, Chih-Shi Yee, Thomas Edward Pare, Jr.
  • Publication number: 20210105859
    Abstract: A physical protocol data unit (PPDU) transmission method includes aligning parameters of a plurality of links for constraining the plurality of links to have same capacity for PPDU transmission, and transmitting PPDUs via the plurality of links. Highest capacity supported by one of the plurality of links is different from highest capacity supported by another of the plurality of links. Each of the PPDUs is generated and transmitted under the same parameters.
    Type: Application
    Filed: September 22, 2020
    Publication date: April 8, 2021
    Inventors: Chien-Fang Hsu, Yongho Seok, James Chih-Shi Yee
  • Patent number: 10973052
    Abstract: A data unit (e.g., a physical layer convergence procedure (PLCP) protocol data unit (PPDU)) is detected at a first wireless device that is a member of a basic service set (BSS). The data unit was sent on a channel from a second wireless device that is a member of an overlapping basic service set (OBSS). When the first wireless device ignores the data unit and obtains a transmit opportunity for the channel according to a spatial reuse procedure, then the first wireless device is prohibited from transmitting a frame to a device that is a member of the OBSS during the time interval associated with the transmit opportunity.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: April 6, 2021
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Yongho Seok, James June-Ming Wang, Chao-Chun Wang, Chih-Shi Yee
  • Patent number: 10972963
    Abstract: Systems and methods of providing Basis Service Set (BSS) load information pertinent to multi-user (MU) communications in WLAN systems. An access point (AP) can determine the counts of MU-capable user stations (STAs) active STAs in a BSS. Each MU-capable STA is configured for Multi-User Multiple-Input Multiple-Output (MU-MIMO) communications and/or Orthogonal Frequency-Division Multiple Access (OFDMA) communications. The AP can further determine ratios of PPDU time over an observation period of MU uplink (UL) and downlink (DL) communications, respectively. The AP can further determine an underutilization level of each available frequency subband, the underutilization level integrating the actual underutilization in terms of both spatial streams and frequency subbands. The DL and UL underutilization levels can be separately determined and reported. The MU BSS load information can be included in a beacon frame as a BSS load information element and distributed to user STAs periodically.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: April 6, 2021
    Inventors: Chien-Fang Hsu, Chao-Chun Wang, Chih-Shi Yee, Gabor Bajko
  • Publication number: 20210076413
    Abstract: An apparatus (e.g., an access point (AP) establishes a plurality of links comprising a primary link and at least a secondary link. The apparatus transmits a management frame on the primary link to indicate a multi-link capability of the AP. The apparatus configures the secondary link for one or more non-AP stations (STAs), which are capable of operating on the primary link and the secondary link, with multi-link capability and operating parameters through an association procedure on the primary link.
    Type: Application
    Filed: September 2, 2020
    Publication date: March 11, 2021
    Inventors: Kaiying Lu, Yongho Seok, James Chih-Shi Yee, Chao-Chun Wang, Jianhan Liu, Thomas Edward Pare, JR.
  • Publication number: 20210076249
    Abstract: A link condition announcement method is employed by a wireless fidelity (WiFi) multi-link device (MLD), and includes: obtaining information of a traffic condition of each of a plurality of links owned by the WiFi MLD according to traffic statistics of each of the plurality of links, and transmitting the information of the traffic condition of each of the plurality of links to another WiFi MLD that communicates with the WiFi MLD.
    Type: Application
    Filed: August 27, 2020
    Publication date: March 11, 2021
    Inventors: Chien-Fang Hsu, Yongho Seok, James Chih-Shi Yee
  • Publication number: 20210068171
    Abstract: A control link switch method is employed by a wireless fidelity (WiFi) multi-link device (MLD). The control link switch method includes: sending a request frame to another WiFi MLD for requesting a switch process of switching a current control link to a new control link, and receiving a response frame from another WiFi MLD. After the response frame is received, the new control link is selectively enabled at the WiFi MLD.
    Type: Application
    Filed: August 19, 2020
    Publication date: March 4, 2021
    Inventors: Chien-Fang Hsu, James Chih-Shi Yee
  • Patent number: 10932179
    Abstract: A method and apparatus for supporting A-MSDU data transfer in an A-MPDU system includes sending capability information from a first network device, receiving onto the first network device an A-MPDU frame that includes A-MSDU data, and sending an acknowledgment from the first network device. A bit field in the capability information indicates if inclusion of A-MSDU data in an A-MPDU payload is supported. The first network device is a wireless station (STA). The first network device is part of a peer-to-peer network. The A-MSDU is in a data enabled immediate response context. A bit field in the capability information indicates if receiving an A-MPDU frame including A-MSDU data carried in a QoS Data frame without a block acknowledgment agreement is supported.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: February 23, 2021
    Assignee: MEDIATEK Singapore Pte Ltd.
    Inventors: Yongho Seok, Chao-Chun Wang, Chih-Shi Yee