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公开(公告)号：US09979522B2
公开(公告)日：2018-05-22
申请号：US15281030
申请日：2016-09-29
Applicant: MEDIATEK INC.
Inventor： Chien-Chang Li , Weidong Yang , Pei-Kai Liao , Bo-Si Chen
CPC classification number: H04L5/0048 , H04W48/16 , H04W72/042 , H04W72/0446 , H04W88/02
Abstract: Methods and apparatus are provided for multiplexing DRS within a transmission burst for opportunistic spectrum access. In one novel aspect, DRS is not transmitted in a fractional subframe within a TXOP. In one embodiment, if the starting fractional subframe, which contains initial signal, occurs in a configured DMTC, DRS is transmitted in the first subframe next to the starting fractional subframe. In another embodiment, if DMTC starts from a complete subframe within a TXOP, DRS is transmitted in the first candidate position within a DMTC. In another novel aspect, in the DRS subframe, PDSCH is allocated in the PRBs outside the central PRBs (six or twenty-five PRBs). In one embodiment, the reservation signal can be used to satisfy the requirement of occupied bandwidth and continuity transmission. In another embodiment, the free REs in central PRBs carry the system information when required on the unlicensed band.
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公开(公告)号：US20170238334A1
公开(公告)日：2017-08-17
申请号：US15432022
申请日：2017-02-14
Applicant: MEDIATEK INC.
Inventor： Weidong Yang , Bo-Si Chen , Chien-Chang Li , Yih-Shen Chen , Pavan Santhana Krishna Nuggehalli
CPC classification number: H04W74/0816 , H04W74/006 , H04W74/0808
Abstract: A method of dynamic spectrum sharing mechanism called listen-before-talk (LBT) is proposed for uplink transmission in Licensed Assisted Access (LAA). A maximum channel occupancy time (MCOT) including downlink (DL) transmission from one eNB and uplink (UL) transmission to the same eNB is introduced. A transmission sequence is defined as a number of subframes including possible partial subframes for DL and/or UL within a MCOT. The transmission in the first subframe among the transmission sequence is conducted after a Category 4 LBT. The transmission sequence within the MCOT can be initiated by either a DL transmission or an UL transmission. After the first subframe in a transmission sequence, LBT for another transmission is a fast DL LBT and/or fast UL LBT. Further, a Category 4 LBT can be converted to a short LBT (e.g., one shot CCA) for more efficient channel access.
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33.发明申请公开(公告)号：US20170055293A1
公开(公告)日：2017-02-23
申请号：US15238610
申请日：2016-08-16
Applicant: MEDIATEK INC.
Inventor： Weidong Yang , Chien-Chang Li , Pei-Kai Liao , Bo-Si Chen
IPC: H04W74/08 , H04L12/851
CPC classification number: H04L47/24 , H04L5/0035 , H04W74/002
Abstract: A method of distributed control achieving fair radio resource access is proposed. The parameters used in a listen-before-talk (LBT) channel access procedure that are used to control how aggressively a node contends for channel access can be called as “Channel Access Transmission Parameters” or CAT parameters. The proposed method uses randomized CAT parameters for each traffic type, and then obtains prioritized access for some nodes at any given time and fair access averaged over a period of time. More specifically, a transmitting node can use more than one set of CAT parameters even for the same traffic type instead of conventional only use one set of CAT parameters for one traffic type. The transmitting node can use a set of CAT parameters according to a fixed schedule, a random rule, or a pseudo-random rule.
Abstract translation: 提出了一种实现公平无线电资源访问的分布式控制方法。 在用于控制节点竞争通道接入的积极性的用于听即演（LBT）通道访问过程中使用的参数可被称为“通道访问传输参数”或CAT参数。 所提出的方法针对每个流量类型使用随机CAT参数，然后在任何给定时间获得一些节点的优先级访问，并在一段时间内平均访问。 更具体地，即使对于相同的业务类型，发送节点也可以使用多于一组的CAT参数集，而不是传统的仅为一种业务类型使用一组CAT参数。 发送节点可以根据固定的时间表，随机规则或伪随机规则使用一组CAT参数。
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公开(公告)号：US11622284B2
公开(公告)日：2023-04-04
申请号：US16926864
申请日：2020-07-13
Applicant: MEDIATEK INC.
Inventor： Chien-Hwa Hwang , Chien-Chang Li , Yi-Ju Liao , Pei-Kai Liao , Weidong Yang
IPC: H04L5/00 , H04W16/28 , H04W72/044 , H04L1/1829 , H04W72/04 , H04W74/08 , H04B7/06
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.
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公开(公告)号：US20210273835A1
公开(公告)日：2021-09-02
申请号：US17324397
申请日：2021-05-19
Applicant: Mediatek Inc.
Inventor： Yiju LIAO , Chien Hwa HWANG , Chien-Chang Li
Abstract: A UE determines a first DCCH resource candidate in a first CORESET on a carrier, the first DCCH resource candidate including a first set of RBs. The UE also determines a first sequence of DMRSs that are mapped, starting at a reference point, to RBs in a predetermined range within the carrier in a frequency domain, the predetermined range containing the first DCCH resource candidate in the frequency domain. The UE further determines a first reference location of the first set of RBs. The UE determines, based on the first reference location, a first set of DMRSs from the first sequence of DMRSs, the first set of DMRSs being mapped to the first set of RBs. The UE obtains a channel estimation based on the first set of DMRSs; and The UE performs blind decoding of the first DCCH resource candidate based on the channel estimation.
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Patent Agency Ranking
公开(公告)号：US20200053646A1
公开(公告)日：2020-02-13
申请号：US16537537
申请日：2019-08-10
Applicant: MediaTek Inc.
Inventor： Chun-Hsuan Kuo , Jiann-Ching Guey , Chiou-Wei Tsai , Chien-Chang Li , Cheng Rung Tsai
Abstract: Various solutions for wake-up signal and preamble design for mobile communications are described. An apparatus, while in a first mode of operation, receives a wake-up signal (WUS) from a network. In response to receiving the WUS, the apparatus switches to a second mode of operation from the first mode of operation. The apparatus then detects a preamble in downlink (DL) transmissions from the network. In response to detecting the preamble, the apparatus monitors a physical downlink control channel (PDCCH) to check for an uplink (UL) transmission grant for the apparatus from the network.
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公开(公告)号：US10341070B2
公开(公告)日：2019-07-02
申请号：US15672523
申请日：2017-08-09
Applicant: MEDIATEK INC.
Inventor： Weidong Yang , Yih-Shen Chen , Chien-Chang Li , Bo-Si Chen
Abstract: Aspects of the disclosure provide a method of data transmission that includes determining a transmission time interval for transmission of a transport block and setting a segmentation threshold for the transport block to a first threshold or a second threshold that is less than the first threshold based on the determined transmission time interval. The method includes converting the transport block into one or more outgoing code blocks that each has a size not greater than the determined segmentation threshold and encoding the one or more outgoing code blocks for transmission when communication device is configured to transmit the transport block. The method also includes receiving one or more incoming code blocks that each has a size not greater than the determined segmentation threshold and reconstructing the transport block from the one or more incoming code blocks when communication device is configured to receive the transport block.
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公开(公告)号：US20180368116A1
公开(公告)日：2018-12-20
申请号：US16007156
申请日：2018-06-13
Applicant: Mediatek Inc.
Inventor： Yiju Liao , Chien Hwa Hwang , Chien-Chang Li , Pei-Kai Liao
Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives a CORESET configuration specifying one or more properties of a first CORESET. The UE also determines time and frequency resource elements of the first CORESET based on the one or more properties. The UE performs blind decoding on down-link control channel candidates in a search space carried by the first CORESET to obtain a down-link control channel.
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公开(公告)号：US10104691B2
公开(公告)日：2018-10-16
申请号：US15098431
申请日：2016-04-14
Applicant: MEDIATEK INC.
Inventor： Chien-Chang Li , Pei-Kai Liao , Weidong Yang , Bo-Si Chen
Abstract: A method of determining and adapting a contention window size (CWS) based on channel loading for load-based equipment (LBE) listen before talk (LBT) channel access mechanism is proposed. The historic observations obtained from carrier sensing can reflect the state of channel loading, which is then used to adapt the maximal contention window size. A wireless device collects historical channel loading information including the number of idle slots and the number of busy slots. The wireless device uses the historical information to estimate the total number of active devices M in the wireless network and the channel-loading factor. The wireless device then computes the thresholds using the long-term value of M and then adapts the value of the CWS based on the channel-loading factor and the thresholds.
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公开(公告)号：US10045376B2
公开(公告)日：2018-08-07
申请号：US15433492
申请日：2017-02-15
Applicant: MEDIATEK INC.
Inventor： Weidong Yang , Bo-Si Chen , Chien-Chang Li , Yih-Shen Chen , Pavan Santhana Krishna Nuggehalli
IPC: G01R31/08 , H04L12/28 , H04L5/14 , H04J3/00 , H04W74/04 , H04W72/04 , H04W76/02 , H04W16/14 , H04W72/12 , H04W72/08 , H04W76/10
Abstract: A method of channel access procedure and QoS provisioning is proposed. When more than one user equipments (UEs) contend uplink transmission for a given time slot in an unlicensed band, uplink listen-before-talk (LBT) scheme should perform in a proper way to reflect service prioritization. The base station first determines the Channel Access Priority (CAP) for uplink LBT, and then signals such CAP to the UE via PDCCH. Upon receiving the CAP, the UE performs LBT procedure with corresponding CAP before uplink transmission. For example, the CAP can be determined based on QoS class identifier (QCI) of the radio bearer or based on the MAC layer logical channel prioritization (LCP).
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