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21.发明申请公开(公告)号：US20160309512A1
公开(公告)日：2016-10-20
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
IPC: H04W74/08
CPC classification number: H04W74/0816 , H04W74/085
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.
Abstract translation: 提出了一种基于用于基于负载的设备（LBE）听话（LBT）信道访问机制的信道加载来确定和适应竞争窗口大小（CWS）的方法。 从载波侦听获得的历史观察可以反映信道加载的状态，然后将其用于适应最大争用窗口大小。 无线设备收集历史信道加载信息，包括空闲时隙的数量和忙时隙的数量。 无线设备使用历史信息来估计无线网络中的有效设备M的总数和信道负载因子。 然后，无线设备使用M的长期值来计算阈值，然后基于信道负载因子和阈值来适配CWS的值。
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22.发明申请公开(公告)号：US20160309511A1
公开(公告)日：2016-10-20
申请号：US15098409
申请日：2016-04-14
Applicant: MEDIATEK INC.
Inventor： Chien-Chang Li , Pei-Kai Liao , Weidong Yang , Bo-Si Chen
CPC classification number: H04W74/0816 , H04W74/006 , H04W74/0808
Abstract: A method of determining and configuring a maximal clear channel assessment (CCA) duration based on channel loading information for frame-based equipment (FBE) listen before talk (LBT) channel access mechanism is proposed. The CCA period is a random CCA duration generated out of the maximal CCA duration, which is configurable and is carried in the radio resource control (RRC) signaling or the beacon signal of LAA. To solve the collision problem in synchronous network and the unfairness problem in asynchronous network, the maximal duration of CCA should be adaptive based on the experienced channel occupancy status and/or the experienced synchronization difference within the network. First, the maximal duration of CCA should be adjusted according to the channel loading. Second, the maximal duration of CCA should be larger than the timing difference between eNBs or between UEs.
Abstract translation: 提出了一种基于用于基于帧的设备（FBE）监听（LBT）信道访问机制的信道加载信息来确定和配置最大清除信道评估（CCA）持续时间的方法。 CCA周期是从最大CCA持续时间产生的随机CCA持续时间，其可配置并且在无线电资源控制（RRC）信令或LAA的信标信号中携带。 为了解决异步网络中的碰撞问题和异步网络中的不公平问题，基于有经验的信道占用状态和/或网络内有经验的同步差异，CCA的最大持续时间应该是自适应的。 首先，CCA的最大持续时间应根据通道负载进行调整。 第二，CCA的最大持续时间应该大于eNB之间或UE之间的定时差。
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公开(公告)号：US11895510B2
公开(公告)日：2024-02-06
申请号：US18117387
申请日：2023-03-03
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 , H04W72/23 , H04L1/1829 , H04W74/08 , H04B7/06
CPC classification number: H04W16/28 , H04L1/1861 , H04L5/0053 , H04W72/046 , H04W72/23 , H04W74/08 , H04B7/0617 , H04L5/0037 , H04L5/0048
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：US11611461B2
公开(公告)日：2023-03-21
申请号：US17324348
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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公开(公告)号：US20200344616A1
公开(公告)日：2020-10-29
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
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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Patent Agency Ranking
公开(公告)号：US10764892B2
公开(公告)日：2020-09-01
申请号：US15868015
申请日：2018-01-11
Applicant: MEDIATEK INC.
Inventor： Pei-Kai Liao , Tao Chen , Chien-Chang Li
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.
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公开(公告)号：US10420135B2
公开(公告)日：2019-09-17
申请号：US15474094
申请日：2017-03-30
Applicant: MEDIATEK INC.
Inventor： Weidong Yang , Chien-Chang Li , Bo-Si Chen , Yih-Shen Chen
Abstract: A physical random access channel (PRACH) waveform design to satisfy the requirements on the occupied channel bandwidth in eLAA wireless communications network is provided. In one alternative, PRACH comprises multiple segments in the time/frequency domain in one subframe. In another alternative, PRACH comprises multiple segments in the time/frequency domain across two or more subframes by using inter-subframe hopping. In one advantageous aspect, PDCCH triggers the dynamic allocation of the PRACH resource to facilitate the listen-before-talk (LBT) channel access procedure in unlicensed carriers. The aperiodic and dynamic allocation of PRACH resource improves efficiency and PRACH success rate.
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公开(公告)号：US10292182B2
公开(公告)日：2019-05-14
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
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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公开(公告)号：US10251067B2
公开(公告)日：2019-04-02
申请号：US15070191
申请日：2016-03-15
Applicant: MEDIATEK INC.
Inventor： Pei-Kai Liao , Weidong Yang , Chien-Chang Li , Bo-Si Chen
Abstract: Periodic Radio Resource Management (RRM) reporting from user equipments (UEs) is beneficial for a network to efficiently select a carrier with a cleaner channel to serve the UEs. To enable periodic RRM reporting from UEs, periodic beacon signal transmission for UE measurements is necessary. However, in a shared spectrum, precise periodic transmission cannot be guaranteed due to channel contention. A method of transmission with periodic time windows for beacon signal transmission is proposed to resolve potential issues. Under the proposed solution, beacon signal can be transmitted in a certain periodic fashion without frequent physical layer signaling. Furthermore, periodic beacon signal transmission for measurements can be kept with low transmission failure rate due to channel contention.
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公开(公告)号：US20180198585A1
公开(公告)日：2018-07-12
申请号：US15864838
申请日：2018-01-08
Applicant: MEDIATEK INC.
Inventor： Hsuan-Li LIN , Pei-Kai Liao , Chien-Chang Li
Abstract: Aspects of the disclosure provide a method for transmission of downlink mobile reference signals (MRSs). The method can include transmitting an MRS that includes a first part MRS and an additional part MRS, wherein the first part MRS includes first MRS bursts each multiplexed with a synchronization signal block (SS block), and the additional part MRS includes second MRS bursts and is configurable to be transmitted or not transmitted.
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