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).

  • Physical downlink control channel design for 5G new radio
    Patent number: 10785769
    Abstract: A method to improve the design of new radio physical downlink control channel (NR-PDCCH) transmission and to reduce the false alarm rate of NR-PDCCH blind decoding is proposed. The downlink control information (DCI) bits are carried by NR-PDCCH to be transmitted to UEs after CRC attachment, channel encoding, interleaving, and modulation. The proposed NR-PDCCH design is separated into two parts. In a first part, a UE-ID or RNTI is used to derive a CRC mask or a scrambling sequence for CRC attachment of the DCI bits. In a second part, a UE-specific ID is used to derive an interleaver before or after channel encoding of the DCI bits. If the interleaver is placed before channel encoding, it takes the form of a bit interleaver. If the interleaver is placed after channel encoding, it takes the form of a bit interleaver or a channel interleaver.
    Type: Grant
    Filed: September 3, 2019
    Date of Patent: September 22, 2020
    Assignee: MediaTek INC.
    Inventors: Chien-Hwa Hwang, Weidong Yang, Pei-Kai Liao, Wei-De Wu
  • Efficient wide bandwidth operation and efficient UE-specific RF bandwidth adaptation
    Patent number: 10764892
    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, wherein 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, wherein 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: January 11, 2018
    Date of Patent: September 1, 2020
    Assignee: MEDIATEK INC.
    Inventors: Pei-Kai Liao, Tao Chen, Chien-Chang Li
  • REMAINING MINIMUM SYSTEM INFORMATION RECEPTION IN 5G WIRELESS COMMUNICATION SYSTEM
    Publication number: 20200275420
    Abstract: Aspects of the disclosure provide a method for remaining minimum system information (RMSI) reception. The method can include receiving a PBCH carrying a beam index (SBI) and indicating configuration information of a sequence of RMSI PDCCH monitoring occasions. The PBCH is carried in an SS block of an SS block burst set. The configuration information indicates an RMSI offset (D) between a timing reference and a slot carrying the RMSI PDCCH monitoring occasion at the beginning of the sequence of the RMSI PDCCH monitoring occasions, and an RMSI interval (T) between two RMSI PDCCH monitoring occasions in the sequence of RMSI PDCCH monitoring occasions. The method further includes determining a timing of a first RMSI PDCCII monitoring occasion in the sequence of RMSI PDCCH monitoring occasion according to the SBI and the configuration information.
    Type: Application
    Filed: November 19, 2018
    Publication date: August 27, 2020
    Applicant: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Tao CHEN, Pei-Kai LIAO
  • Physical downlink control channel design for NR systems
    Patent number: 10757581
    Abstract: A new design for physical downlink control channel (PDCCH) is proposed for the next generation 5G new radio systems. A UE receives the configuration of a default control resource set (CORESET) in MIB/SIB from its serving base station. The default CORESET contains both common search space and UE-specific search space for candidate PDCCH transmission. A PDCCH in a default CORESET is mapped to physical resource in a distributed or localized manner. Specifically, various REG-to-CCE mapping rules are proposed to improve frequency diversity gain, or frequency selectivity gain, or to reduce latency of PDCCH processing. Further, to facilitate analog beamforming in mmWave systems, the default CORESET is transmitted in a synchronization signal (SS) block associated with a corresponding analog beam direction.
    Type: Grant
    Filed: March 21, 2018
    Date of Patent: August 25, 2020
    Assignee: MEDIATEK INC.
    Inventors: Chien-Hwa Hwang, Chien-Chang Li, Yi-Ju Liao, Pei-Kai Liao, Weidong Yang
  • DYNAMIC BWP SWITCHING UNDER MULTI-TRP TRANSMISSIONS
    Publication number: 20200266961
    Abstract: A UE receives a bandwidth part switch command from a first TRP, the bandwidth part switch command instructing the UE to switch from communicating on a first bandwidth part to communicating on a second bandwidth part. The UE (a) determines to accept the bandwidth part switch command based on a priority level of the first TRP among the plurality of TRPs or (b) informs other TRPs of the plurality of TRPs. The UE switches from communicating on the first bandwidth part to communicating on the second bandwidth part. A first TRP determines whether the first TRP is a primary TRP instructing to switch from communicating on a first bandwidth part to communicating on a second bandwidth part. The first TRP communicates with the UE via the first TRP on either the first bandwidth part or the second bandwidth part, when the first TRP is the primary TRP.
    Type: Application
    Filed: February 13, 2020
    Publication date: August 20, 2020
    Inventors: Lung-Sheng Tsai, Pei-Kai Liao, Weidong Yang
  • Flexible frame structure for OFDM systems
    Patent number: 10736101
    Abstract: A flexible radio frame structure for both FDD and TDD is proposed. Under the flexible frame structure, each radio frame consists of a plurality of slots, and each slot within a radio frame has a flexible slot type. As a basic scheduling unit, each slot can be configured by the base station via physical layer signaling. The slot type can be changed dynamically based on current system needs to support different DL/UL ratios and latency requirements. With the support of different slot types and asynchronous DL/UL HARQ operation, HARQ operation for DL/UL can share the same HARQ timing to simplify the system design and reduce implementation complexity.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: August 4, 2020
    Assignee: MEDIATEK INC.
    Inventors: Pei-Kai Liao, Tao Chen, Jiann-Ching Guey
  • Bandwidth Part (BWP) Operations for New Radio in Unlicensed Spectrum (NR-U)
    Publication number: 20200228992
    Abstract: For downlink (DL) reception in an unlicensed spectrum, a UE receives control signaling indicating an active DL bandwidth part (BWP), and DL control information indicating scheduled radio resources within the active DL BWP. The UE receives an encoded signal containing code blocks (CBs) of a transport block (TB) over the clusters in the active DL BWP that are determined to be clear based on listen-before-talk (LBT), and decodes the CBs in a frequency-first order within a cluster of the active DL BWP followed by a time order and then a cluster order in a slot. For uplink (UL) transmission, a UE encodes the CBs in a frequency-first order within a cluster of the active UL BWP followed by a time order and then a cluster order in a slot, and transmits the encoded signal over a cluster of the active UL BWP that is clear for transmission based on LBT.
    Type: Application
    Filed: January 10, 2020
    Publication date: July 16, 2020
    Inventors: Cheng-Rung Tsai, Pei-Kai Liao
  • Methods of Efficient HARQ Operation for Low Latency and High Performance Services
    Publication number: 20200228249
    Abstract: An efficient Hybrid Automatic Repeat Request (HARQ) operation for low-latency and high-performance services in one radio access technology (RAT) in a wireless communication network is proposed. Under the proposed single HARQ operation scheme, an adaptive HARQ-ACK feedback timing is applied based on UE conditions and UE capability to support the tradeoff between low-latency and high-performance applications. In one embodiment, UE signals the network its HARQ-ACK timing capability. Furthermore, an adaptive number of HARQ processes is applied with a fixed HARQ soft buffer size because the hardware cost for HARQ soft buffer does not linearly increase with the number of HARQ processes. In one embodiment, UE determines a nominal HARQ soft buffer size and HARQ soft buffer size for each HARQ process based on a network-configured HARQ process number.
    Type: Application
    Filed: March 31, 2020
    Publication date: July 16, 2020
    Inventors: Pei-Kai Liao, Ming-Che Lu, Yan-Shuo Chang, Chien-Hwa Hwang
  • Uplink channel information feedback timing signaling in wireless communications
    Patent number: 10716127
    Abstract: Various solutions with respect to uplink control information (UCI) feedback timing signaling in wireless communications are described. A user equipment (UE) identifies a type of uplink (UL) transmission to perform with respect to a network node of a wireless network. The UE receives a control signal from the network node and determines, based on the control signal, a timing offset of a transmission schedule for the identified type of the UL transmission. The UE performs the UL transmission to the network node according to the transmission schedule such that a first type of the UL transmission is performed with a first timing offset and a second type of the UL transmission is performed with a second timing offset different than the first timing offset.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: July 14, 2020
    Assignee: MEDIATEK INC.
    Inventors: Weidong Yang, Lung-Sheng Tsai, Pei-Kai Liao, Jiann-Ching Guey
  • Methods of Efficient Wideband Operation for Intra-band Non-contiguous Spectrum
    Publication number: 20200221308
    Abstract: A method of efficient wideband operation for intra-band non-contiguous spectrum using extending bandwidth part (BWP) configuration is proposed. The BWP definition is extended to cluster BWPs to aggregate distributed spectrum blocks within a frequency range (e.g., 200 MHz) by single carrier operation and facilitate UE to filter out the transmission of unknown RAT between any two of the distributed spectrum blocks. In addition, the cluster BWP configuration enables dynamic aggregation of the number and location of the distributed spectrum blocks based on LBT results in unlicensed spectrum. Specifically, the BWP definition is extended to a group of one or multiple radio resource clusters, each of which contains a set of contiguous PRBs in frequency domain within the associated carrier.
    Type: Application
    Filed: January 3, 2020
    Publication date: July 9, 2020
    Inventor: Pei-Kai Liao
  • Efficient Bandwidth Adaptation for a Wideband Carrier
    Publication number: 20200186319
    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: February 14, 2020
    Publication date: June 11, 2020
    Inventors: Pei-Kai Liao, Chia-Chun Hsu
  • Methods and apparatus for cell access via anchor carrier
    Patent number: 10681623
    Abstract: Methods and apparatus are provided for cell access via the anchor carrier. In one novel aspect, the default bandwidth with a default subcarrier spacing in an anchor carrier is provided. The subcarrier spacing for the default bandwidth is the minimum subcarrier spacing of the numerologies supported by the system, depending on the frequency band and/or the deployment scenario. In one embodiment, one or more control information comprising SS1, SS2, RS, NR_MIB, and NR_ESI are received over the default bandwidth. In another embodiment, the Non-ESI information is received through one of Non-ESI carriers comprising a Msg4 during RACH access procedure, a dedicated channel for the UE as a user specific data scheduled by a SI-response message, and a broadcast data with a default or configurable period indicated for transmission by a SI-response message.
    Type: Grant
    Filed: January 14, 2019
    Date of Patent: June 9, 2020
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Tao Chen, Hua-Min Chen, Pei-Kai Liao
  • PAGING IN BEAMFORMED WIRELESS COMMUNICATION SYSTEM
    Publication number: 20200169446
    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: Application
    Filed: June 19, 2018
    Publication date: May 28, 2020
    Applicant: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Tao CHEN, Pei-Kai LIAO, Chien Hwa HWANG, Min WU, Jianwei ZHANG
  • Method and apparatus for control signaling
    Patent number: 10666397
    Abstract: Aspects of the disclosure provide an apparatus that includes a receiving circuit and a baseband processing circuit. The receiving circuit is configured to receive signals transmitted from another apparatus to the apparatus and generate digital samples in response to the received signals. The received signals have a plurality of frequency sub-bands allocated as transmission resources. A specific frequency sub-band is allocated to the apparatus to carry data and control information to the apparatus. The baseband processing circuit is configured to receive the digital samples, process the digital samples to generate symbols in the respective frequency sub-bands, and decode the symbols in the respective frequency sub-bands to determine the specific frequency sub-band that is allocated to the apparatus.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: May 26, 2020
    Assignee: MEDIATEK INC.
    Inventors: Wei-De Wu, Pei-Kai Liao, Chien-Hwa Hwang
  • Methods of efficient HARQ operation for low latency and high performance services
    Patent number: 10644840
    Abstract: An efficient Hybrid Automatic Repeat Request (HARQ) operation for low-latency and high-performance services in one radio access technology (RAT) in a wireless communication network is proposed. Under the proposed single HARQ operation scheme, an adaptive HARQ-ACK feedback timing is applied based on UE conditions and UE capability to support the tradeoff between low-latency and high-performance applications. In one embodiment, UE signals the network its HARQ-ACK timing capability. Furthermore, an adaptive number of HARQ processes is applied with a fixed HARQ soft buffer size because the hardware cost for HARQ soft buffer does not linearly increase with the number of HARQ processes. In one embodiment, UE determines a nominal HARQ soft buffer size and HARQ soft buffer size for each HARQ process based on a network-configured HARQ process number.
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: May 5, 2020
    Assignee: MEDIATEK INC.
    Inventors: Pei-Kai Liao, Ming-Che Lu, Yen-Shuo Chang, Chien-Hwa Hwang
  • Group common PDCCH design in NR
    Patent number: 10645641
    Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE). The UE receives symbols in a first time slot. The first time slot includes a control region and a data region. The UE attempts to detect, when the UE is configured to detect, a group common downlink control channel carried by the received symbols. The group common downlink control channel contains common information directed to a group of UEs including the UE. When the detection is successful, the UE determines, based on the common information, at least one of (a) a first slot configuration, (b) a puncture configuration, (c) a transmission burst duration, and (d) one or more sub-regions of the control region.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: May 5, 2020
    Assignee: MEDIATEK INC.
    Inventors: Chien-Chang Li, Yiju Liao, Chien Hwa Hwang, Pei-Kai Liao
  • Methods of Efficient Bandwidth Part Switching in Carrier Aggregation
    Publication number: 20200107308
    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 23, 2019
    Publication date: April 2, 2020
    Inventors: Pei-Kai Liao, Wei-De Wu, Jia-Hong Syu
  • Efficient bandwidth adaptation for a wideband carrier
    Patent number: 10594468
    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: September 28, 2018
    Date of Patent: March 17, 2020
    Assignee: MEDIATEK INC.
    Inventors: Pei-Kai Liao, Chia-Chun Hsu
  • Methods of efficient downlink control information transmission
    Patent number: 10595326
    Abstract: A method of downlink control information (DCI) transmission is proposed to enhance DCI transmission efficiency over physical layer signaling in cellular mobile communication networks. A serving base station uses a higher layer signaling, e.g., radio resource control (RRC) signaling message to configure a plurality of user equipments (UEs) to monitor UE-group DCI. When the UE is configured to monitor UE-group DCI, the UE monitors both unicast DCI and UE-group DCI in each corresponding scheduling time unit, e.g., a subframe in LTE. The candidate positions of the unicast DCI and the UE-group DCI can be orthogonal, partially overlapping, or fully overlapping with each other.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: March 17, 2020
    Assignee: MEDIATEK INC.
    Inventors: Pei-Kai Liao, Yi-Ju Liao
  • METHODS AND APPARATUS FOR RRM MEASUREMENT AND REPORTING MECHANISM
    Publication number: 20200068420
    Abstract: Aspects of the disclosure provide a method for radio resource management (RRM) measurement. A measurement configuration can be received at a user equipment (UE) from a base station (BS) in a beam-formed system. The measurement configuration indicates a measurement of a neighbor cell to be performed based on a synchronization signal block (SS block) timing relationship between the neighbor cell and a known cell. The known cell is a serving cell of the UE, or a second neighbor cell of the UE. Beam measurement results of the neighbor cell are reported using SS block indexes of the known cell.
    Type: Application
    Filed: May 15, 2018
    Publication date: February 27, 2020
    Applicant: MEDIATEK SINGAPORE PTE. LTE.
    Inventors: Tao CHEN, Pei-Kai LIAO, Min WU