Patents by Inventor Pei-Kai Liao

Pei-Kai Liao 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: 20220239454
    Abstract: Apparatus and methods are provided for efficient bandwidth adaptation for wideband carrier. In one novel aspect, the UE starts a BWP timer upon detecting one or more BWP timer starting triggering events, resets the BWP timer upon detecting BWP resetting triggering events, and switches to the default BWP upon expiration of the BWP timer. The BWP timer starting triggering events comprises decoding a command to switch away from the default BWP, the detection of end of DL data transmission in DRX mode. In another novel aspect, the UE only decodes the DCI indication for active BWP switching in the first three OFDM symbols of a subframe or a slot. In yet another novel aspect, when the SPS is configured for the serving cell for a UE with multiple BWPs, the SPS is configured for all the BWPs accordingly.
    Type: Application
    Filed: April 12, 2022
    Publication date: July 28, 2022
    Inventors: Pei-Kai Liao, Chia-Chun Hsu
  • Patent number: 11399370
    Abstract: Apparatus and methods are provided for virtual carrier operation in wireless systems with large carrier bandwidth. In one novel aspect, virtual carrier (VC) with a block of physically contiguous radio resources within a component carrier is configured. In one embodiment, the UE configures a downlink (DL) common virtual carrier (CVC) and an uplink (UL) CVC, which carry control information for the UE, and one or more DL/UL dedicated VCs (DVCs), which carry data services. In one embodiment, the UE obtains the CVC configuration information including the channel bandwidth and the physical location through system information. In another embodiment, the UE obtains DVC configuration through a RRC-layer signaling. In another novel aspect, the UE obtains a VC configuration switch command through either a MAC signal or a PHY signal, and subsequently reconfigures one or more configured VCs based on the received switch command.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: July 26, 2022
    Assignee: MediaTek INC.
    Inventors: Pei-Kai Liao, Chia-Chun Hsu, Tao Chen
  • Patent number: 11388764
    Abstract: Various solutions for coverage extension allowing improved high-frequency and high-data-rate cellular coverage of devices located in conditions of poor network coverage in mobile communications are described. The described solutions may extend coverage, for example, via a sidelink interface between two mobile devices, a relay device in good coverage and a remote device that may be in poor coverage, thus allowing the remote device to communicate using the relay device as a backhaul link to a cellular network.
    Type: Grant
    Filed: April 29, 2020
    Date of Patent: July 12, 2022
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Ahmet Umut Ugurlu, Francesc Boixadera-Espax, Pei-Kai Liao, Nathan Edward Tenny
  • Patent number: 11357007
    Abstract: In one novel aspect, a plurality of synchronization signal (SS) anchors within a block of a contiguous spectrum is configured in a wireless network. Each SS anchor is a primary SS anchor or a secondary SS anchor. The UE performs an initial access by detecting a first primary SS anchor and receives one or more virtual carrier configurations with corresponding SS anchors within the block of the contiguous spectrum. In another novel aspect, the UE performs an initial access through a first RF band with a first bandwidth and a first center frequency, receives a switching signal to switch from the first RF band to a second RF band with a second bandwidth and a second center frequency, the second bandwidth is different from the first bandwidth, and performs a RF bandwidth adaptation from the first RF band to the second RF band based on the adaptation signal.
    Type: Grant
    Filed: July 20, 2020
    Date of Patent: June 7, 2022
    Assignee: MediaTek INC.
    Inventors: Pei-Kai Liao, Tao Chen, Chien-Chang Li
  • Patent number: 11336402
    Abstract: A method of hybrid automatic repeat request (HARQ) feedback can include receiving data transmitted from a transmission (Tx) user equipment (UE) or a base station (BS) over a channel at a reception (Rx) UE, selecting an acknowledgement/negative acknowledgement (A/N) resource from a set of A/N resources for a HARQ feedback of the data based on a channel condition of the channel or a geographical location of the Rx UE, and transmitting the HARQ feedback with the selected A/N resource.
    Type: Grant
    Filed: November 1, 2019
    Date of Patent: May 17, 2022
    Assignee: Mediatek Singapore Pte. Ltd.
    Inventors: Tao Chen, Pei-Kai Liao, Chien-Yi Wang, Ju-Ya Chen
  • Patent number: 11329793
    Abstract: Apparatus and methods are provided for efficient bandwidth adaptation for wideband carrier. In one novel aspect, the UE starts a BWP timer upon detecting one or more BWP timer starting triggering events, resets the BWP timer upon detecting BWP resetting triggering events, and switches to the default BWP upon expiration of the BWP timer. The BWP timer starting triggering events comprises decoding a command to switch away from the default BWP, the detection of end of DL data transmission in DRX mode. In another novel aspect, the UE only decodes the DCI indication for active BWP switching in the first three OFDM symbols of a subframe or a slot. In yet another novel aspect, when the SPS is configured for the serving cell for a UE with multiple BWPs, the SPS is configured for all the BWPs accordingly.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: May 10, 2022
    Assignee: MediaTek INC.
    Inventors: Pei-Kai Liao, Chia-Chun Hsu
  • Publication number: 20220140964
    Abstract: A method for sidelink transmission is described. The method can include obtaining a SCI related configuration received from a base station or a pre-configuration, and transmitting from a transmission user equipment (Tx UE) to a reception user equipment (Rx UE) a transport block with two-stage sidelink control information (SCI) including a 1st-stage SCI and a 2nd-stage SCI. The 1st-stage SCI carries information related to channel sensing, and is transmitted over a physical sidelink control channel (PSCCH). The 2nd-stage SCI and/or the transport block are transmitted over a physical sidelink shared channel (PSSCH). The PSSCH is associated with the PSCCH.
    Type: Application
    Filed: February 18, 2020
    Publication date: May 5, 2022
    Applicant: MediaTek Singapore Pte. Ltd.
    Inventors: Tao CHEN, Chien Hwa HWANG, Chien-Yi WANG, Ju-Ya CHEN, Pei-Kai LIAO
  • Publication number: 20220061041
    Abstract: A method of two-stage sidelink control information (SCI) can include receiving a transport block, and transmitting from a transmission user equipment (Tx UE) to a reception user equipment (Rx UE) the transport block with two-stage SCI including a 1st-stage SCI and a 2nd-stage SCI. The 1st-stage SCI can be transmitted over a physical sidelink control channel (PSCCH). The 2nd-stage SCI and the transport block can share resources of a physical sidelink shared channel (PSSCH). The 2nd-stage SCI and the transport block can share a demodulation reference signal (DMRS).
    Type: Application
    Filed: April 2, 2020
    Publication date: February 24, 2022
    Applicant: MediaTek Singapore Pte. Ltd.
    Inventors: Tao CHEN, Zhixun TANG, Chien-Yi WANG, Pei-Kai LIAO, Min LEI
  • Patent number: 11246139
    Abstract: Aspects of the disclosure provide an apparatus that includes a receiving circuit and a processing circuit. The receiving circuit is configured to receive signals transmitted from a second apparatus to the apparatus and generate digital samples in response to the received signals. The signals have a plurality of resource elements. The processing circuit is configured to receive the digital samples, process the digital samples to generate symbols carried by the resource elements, detect control channel assistance information at a predetermined position of the resource elements and detect control information based on the detection of the control channel assistance information.
    Type: Grant
    Filed: September 30, 2017
    Date of Patent: February 8, 2022
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Tao Chen, Hua-min Chen, Pei-Kai Liao, Jianwei Zhang, Wenze Qu
  • Publication number: 20220015075
    Abstract: A method includes receiving a first higher-layer signal from a base station, wherein the first higher-layer signal enables the use of single PDCCH scheduling PDSCH(s) in two or more serving cells; receiving a second higher-layer signal from the base station, wherein the second higher-layer signal enables the use of cross-carrier HARQ management within the serving cells; receiving DCI in one of the serving cells to obtain the scheduling information of PDSCH(s) in the serving cells; receiving the scheduled PDSCH(s) in the serving cells based on the received DCI to obtain downlink transport blocks carried in the scheduled PDSCH(s); and sending downlink transport blocks to a HARQ entity of the serving cell indicated in the DCI carried in a PDCCH for HARQ management based on a HARQ process number indicated in the DCI carried in the PDCCH.
    Type: Application
    Filed: June 18, 2021
    Publication date: January 13, 2022
    Inventors: Pei-Kai LIAO, Cheng-Hsun LI
  • Publication number: 20220015128
    Abstract: A method includes receiving a higher-layer signal from a base station, wherein the higher-layer signal enables the use of 2-stage DCI based cross-carrier scheduling and provides mapping between a scheduling serving cell and one or more scheduled serving cells; receiving a first-stage DCI carried in a PDCCH in a slot in the scheduling serving cell, wherein the first-stage DCI provides the information related to the corresponding second-stage DCI; receiving a second-stage DCI corresponding to the first-stage DCI in a specific set of resource elements in the same slot in the same scheduling cell as the first-stage DCI-based on the information provided in the first-stage DCI, wherein the second-stage DCI provides scheduling information for the scheduled serving cells; and performing data reception or transmission over the scheduled serving cells based on the received 2-stage DCI.
    Type: Application
    Filed: June 18, 2021
    Publication date: January 13, 2022
    Inventors: Pei-Kai LIAO, Cheng-Hsun LI
  • Patent number: 11218353
    Abstract: Aspects of the disclosure provide a paging method. The method can include performing, by processing circuitry of a user equipment (UE), a downlink synchronization based on an synchronization signal (SS) block of an SS block burst received from a base station in a beamformed wireless communication system, detecting paging downlink control information (DCI) that is collocated with the SS block, and obtaining a paging message or a short message based on the paging DCI.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: January 4, 2022
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Tao Chen, Pei-Kai Liao, Chien Hwa Hwang, Min Wu, Jianwei Zhang
  • Publication number: 20210410128
    Abstract: A method of supporting active bandwidth part (BWP) switching under carrier aggregation (CA) is proposed. To avoid longer switching delay and multiple interruptions in other component carriers (CCs)/cells, the starting time of the later active BWP switching in one cell should fall outside the switching delay of the earlier active BWP switching in another cell. If the later active BWP switching is DCI-based, then the network should schedule the later active BWP switching outside the switching delay of the earlier active BWP switching. If the later active BWP switching is timer-based, then the UE should not perform the later active BWP switching until the earlier active BWP switching is completed.
    Type: Application
    Filed: September 13, 2021
    Publication date: December 30, 2021
    Inventors: Pei-Kai Liao, Wei-De Wu, Jia-Hong Syu
  • Patent number: 11172391
    Abstract: Aspects of the disclosure provide a method for radio resource management (RRM) measurement. The method can include receiving, by processing circuitry of a user equipment (UE), an RRM measurement configuration from a base station (BS) in a beamformed communication system. The RRM measurement configuration indicates presence of multiple quasi collocated (QCLed) frequency domain multiplexed (FDMed) reference signal (RS) transmissions in a carrier. The method can further includes perform RRM measurement according to the received RRM measurement configuration using one or more of the multiple QCLed FDMed RS transmissions.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: November 9, 2021
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Tao Chen, Min Wu, Pei-Kai Liao
  • Patent number: 11140675
    Abstract: A method of supporting active bandwidth part (BWP) switching under carrier aggregation (CA) is proposed. To avoid longer switching delay and multiple interruptions in other component carriers (CCs)/cells, the starting time of the later active BWP switching in one cell should fall outside the switching delay of the earlier active BWP switching in another cell. If the later active BWP switching is DCI-based, then the network should schedule the later active BWP switching outside the switching delay of the earlier active BWP switching. If the later active BWP switching is timer-based, then the UE should not perform the later active BWP switching until the earlier active BWP switching is completed.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: October 5, 2021
    Assignee: MediaTek INC.
    Inventors: Pei-Kai Liao, Wei-De Wu, Jia-Hong Syu
  • Publication number: 20210250132
    Abstract: A method of hybrid automatic repeat request (HARQ) feedback can include receiving data transmitted from a transmission (Tx) user equipment (UE) or a base station (BS) over a channel at a reception (Rx) UE, selecting an acknowledgement/negative acknowledgement (A/N) resource from a set of A/N resources for a HARQ feedback of the data based on a channel condition of the channel or a geographical location of the Rx UE, and transmitting the HARQ feedback with the selected A/N resource.
    Type: Application
    Filed: November 1, 2019
    Publication date: August 12, 2021
    Applicant: Mediatk Singapore Pte. Ltd.
    Inventors: Tao CHEN, Pei-Kai LIAO, Chien-Yi WANG, Ju-Ya CHEN
  • Patent number: 11005602
    Abstract: Techniques and examples of hybrid automatic repeat request (HARQ) buffer size design for communication systems are described. A user equipment (UE) communicates with a serving cell of a wireless network using a HARQ mechanism, with the communicating involving: (a) determining, by the processor, a respective size of each buffer of a plurality of buffers corresponding to a plurality of HARQ processes on a per-HARQ process basis; and (b) storing, by the processor, respective information in each buffer of the plurality of buffers for a corresponding HARQ process among the plurality of HARQ processes.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: May 11, 2021
    Assignee: MediaTek Inc.
    Inventors: Wei-De Wu, Timothy Perrin Fisher-Jeffes, Yen-Shuo Chang, Chia-Wei Tai, Hsien-Kai Hsin, Pei-Kai Liao
  • Publication number: 20210105716
    Abstract: A method of dynamically adapt to a minimum applicable scheduling offset value for a UE operated with bandwidth part (BWP) and cross-slot scheduling in a mobile communication network is proposed. At higher layer (L2 RRC layer), the UE receives RRC configuration for a set of minimum applicable scheduling offset values (K0/K2) for downlink/uplink cross-slot scheduling. At lower layer (L1 physical layer), the UE dynamically determines an active minimum K0/K2 value for an active DL BWP or UL BWP based on 1) a one-bit DCI indicator over PDCCH; or based on 2) an active BWP change due to timeout.
    Type: Application
    Filed: September 4, 2020
    Publication date: April 8, 2021
    Inventors: Wei-De Wu, Cheng-Hsun Li, Yi-Ju Liao, Pei-Kai Liao
  • Publication number: 20210083704
    Abstract: A method of providing over-the-air assistance information for interference cancellation or suppression to the receiver is proposed. Under a first solution, a two-stage DCI (downlink control information) or SCI (sidelink control information) scheduling method is proposed. The set of first-stage DCI or SCI provides a part of scheduling information which is beneficial for interference cancellation or suppression and is broadcasted by a transmitter or scheduler to all receivers. The set of second-stage DCI or SCI includes the remaining scheduling information and is unicasted by a transmitter or scheduler to each receiver. Under a second solution, assistance information DCI for interference cancellation or suppression is broadcasted by a transmitter or scheduler to all receivers.
    Type: Application
    Filed: December 1, 2020
    Publication date: March 18, 2021
    Inventors: Pei-Kai Liao, Chun-Ming Kuo, Chien-Hwa Hwang, Jiann-Ching Guey
  • Patent number: 10932245
    Abstract: A method of wireless communication of a UE is provided. The UE determines resources of a first PDSCH and resources of second at least one PDSCH on a cell, the first PDSCH being a unicast PDSCH specific to the UE. The UE determines that the first PDSCH overlaps with the second at least one PDSCH in a time domain. The UE determines whether the second at least one PDSCH is another unicast PDSCH specific to the UE. When the second at least one PDSCH is not another unicast PDSCH specific to the UE, a duration required for decoding the first PDSCH meets a duration threshold, and the cell is in a first frequency range, the UE (a) refrains from decoding the first PDSCH independently of a transport block size of the second at least one PDSCH or (b) determines a transport block size of the second at least one PDSCH.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: February 23, 2021
    Assignee: MEDIATEK INC.
    Inventors: Chien Hwa Hwang, Pei-Kai Liao, Wei-De Wu, Yen Shuo Chang