公开(公告)号：US10523392B2

公开(公告)日：2019-12-31

申请号：US15864838

申请日：2018-01-08

Applicant: MEDIATEK INC.

Inventor： Hsuan-Li Lin ,  Pei-Kai Liao ,  Chien-Chang Li

IPC: H04L5/00 ,  H04L12/801 ,  H04B7/06 ,  H04W4/70 ,  H04W24/10

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.

公开(公告)号：US10420079B2

公开(公告)日：2019-09-17

申请号：US15473622

申请日：2017-03-30

Applicant: MEDIATEK INC.

Inventor： Weidong Yang ,  Yih-Shen Chen ,  Chien-Chang Li ,  Bo-Si Chen

IPC: H04W72/04 ,  H04W52/14 ,  H04W72/10 ,  H04W72/08 ,  H04L5/00 ,  H04W84/04 ,  H04W52/16 ,  H04W52/28

Abstract: Methods and apparatus are provided for control overhead reduction. The UE configures one or more short transmission time interval regions over a normal TTI region shared by the UE and one or more other, each UE includes a self-contained control information sPDCCH occupying a control information region. The UE detects a cover signal, which indicates one or more resource elements in the sPDCCH control-information region that can be used for data transmission. The UE obtains data transmission from the REs in the SPDCCH control information region based on the detected cover signal. In one embodiment, the cover signal is a dedicated signal. In another embodiment, the cover signal is a common signal. In yet another embodiment, the cover signal is encoded in a downlink control information (DCI) intended for the UE. In one embodiment, the cover signal indicates one or more CCE REs to be excluded for data transmission.

公开(公告)号：US10397795B2

公开(公告)日：2019-08-27

申请号：US15010000

申请日：2016-01-29

Applicant: MEDIATEK INC.

Inventor： Weidong Yang ,  Pei-Kai Liao ,  Chien-Chang Li ,  Bo-Si Chen

IPC: H04W4/00 ,  H04W16/14 ,  H04W72/04 ,  H04L5/00 ,  H04L5/14

Abstract: Methods and apparatus are provided for improved Licensed Assisted Access (LAA) networks. A LAA subframe is received via an unlicensed frequency band. Control information is communicated via predetermined symbol locations within the LAA subframe. An indication of a first and a second symbol locations is received. A LAA subframe is then received. It is determined if control information is present at the first or second symbol locations within the received LAA subframe. Demodulation parameters based on the control information are determined. The LAA subframe is demodulated using the demodulation parameters. An indication of a transmission duration is communicated to a UE. The transmission duration is determined based on the LAA subframe. A type of subframe is determined based on transmission duration. Automatic Gain Control (AGC) protection is provided in a LAA subframe. The AGC protection LLA subframe does not communicate control information in a symbol adjacent to a reservation signal.

公开(公告)号：US20180368115A1

公开(公告)日：2018-12-20

申请号：US16006079

申请日：2018-06-12

Applicant: Mediatek Inc.

Inventor： Chien-Chang Li ,  Chien Hwa Hwang ,  Yiju Liao ,  Weidong Yang ,  Pei-Kai Liao

IPC: H04W72/04

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 resource elements in a time slot. The UE then locates a first control resource set (CORESET) in the resource elements. The UE performs, when the UE is configured to obtain a group common down link control channel, a first blind decoding on the first CORESET to obtain the group common down link control channel based on a group identifier.

公开(公告)号：US20180324689A1

公开(公告)日：2018-11-08

申请号：US15971123

申请日：2018-05-04

Applicant: Mediatek Inc.

Inventor： Chien-Chang Li ,  Yiju Liao ,  Chien Hwa Hwang ,  Pei-Kai Liao

IPC: H04W48/16 ,  H04W72/12 ,  H04W72/14 ,  H04W72/04 ,  H04L5/00 ,  H04W24/10 ,  H04W74/08 ,  H04W52/14

CPC classification number: H04W48/16 ,  H04L5/0053 ,  H04W24/10 ,  H04W52/14 ,  H04W72/042 ,  H04W72/0446 ,  H04W72/121 ,  H04W72/14 ,  H04W74/0808

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.

公开(公告)号：US20180279135A1

公开(公告)日：2018-09-27

申请号：US15927226

申请日：2018-03-21

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Chien-Chang Li ,  Yi-Ju Liao ,  Pei-Kai Liao ,  Weidong Yang

IPC: H04W16/28 ,  H04L1/18 ,  H04W72/04 ,  H04W74/08 ,  H04L5/00 ,  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.

公开(公告)号：US10051662B2

公开(公告)日：2018-08-14

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

IPC: H04W4/00 ,  H04W74/08 ,  H04W74/00

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.

公开(公告)号：US20180132242A1

公开(公告)日：2018-05-10

申请号：US15794882

申请日：2017-10-26

Applicant: MEDIATEK INC.

Inventor： Chien-Chang Li ,  Weidong Yang ,  Bo-Si Chen ,  Yih-Shen Chen

IPC: H04W72/04 ,  H04W76/02 ,  H04W24/10 ,  H04L5/00 ,  H04L1/18

CPC classification number: H04W72/0453 ,  H04L1/1812 ,  H04L1/1861 ,  H04L5/001 ,  H04L5/0042 ,  H04L5/0055 ,  H04L5/0091 ,  H04L5/14 ,  H04W24/10 ,  H04W72/0413 ,  H04W76/10

Abstract: Aspects of the disclosure provide a method for grouping serving cells with shortened transmission time intervals in carrier aggregation. The method can include establishing a connection between user equipment and a base station on a primary cell in a wireless communication system, and transmitting a carrier aggregation configuration for configuring secondary cells for the user equipment from the base station to the user equipment, wherein serving cells with different downlink transmission time interval lengths are organized into different cell groups in the carrier aggregation configuration.

公开(公告)号：US20170290004A1

公开(公告)日：2017-10-05

申请号：US15473628

申请日：2017-03-30

Applicant: MEDIATEK INC.

Inventor： Weidong Yang ,  Yih-Shen Chen ,  Chien-Chang Li ,  Bo-Si Chen

IPC: H04W72/04 ,  H04W72/08

CPC classification number: H04W72/0406 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0087 ,  H04L5/0092 ,  H04W52/146 ,  H04W72/042 ,  H04W72/0446 ,  H04W72/085 ,  H04W72/10 ,  H04W84/042

Abstract: Methods and apparatus are provided for transmission preemption and its indication. In one novel aspect, the UE receives a downlink resource assignment and determines whether an ultra-low latency (ULL) alert signal exists, wherein the ULL alert signal indicates a set of soft bits are overridden. The UE discards the set of soft bits from the overridden resources upon determining the ULL alert signal exists. In one embodiment, the ULL alert signal resides in the assignment subframe, and the overridden soft bits are in the assignment subframe. The alert timing for the ULL alert signal is preconfigured. In another embodiment, the ULL alert signal resides in a subframe that is right after the assignment subframe. The alert signal is enabled through an enabling of an enhanced mobile broadband and ULL service. The alter signal indicates a superset of the overridden soft bits or part of the overridden soft bits.

公开(公告)号：US20170289985A1

公开(公告)日：2017-10-05

申请号：US15473619

申请日：2017-03-30

Applicant: MEDIATEK INC.

Inventor： Weidong Yang ,  Yih-Shen Chen ,  Chien-Chang Li ,  Bo-Si Chen

IPC: H04W72/04 ,  H04W72/10 ,  H04W52/14

CPC classification number: H04W72/0406 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0087 ,  H04L5/0092 ,  H04W52/146 ,  H04W72/042 ,  H04W72/0446 ,  H04W72/085 ,  H04W72/10 ,  H04W84/042

Abstract: Apparatus and methods are provided for low latency an ultra-low latency (ULL) communications. In novel aspect, short TTIs are configured for low latency communications. The UE configures one or more downlink short transmission time interval (sTTI) regions over a normal TTI region, decodes one or more low latency control channels, which indicates one or more sTTI regions for one or more UEs, and obtains one or more sTTI regions for the UE based on the decoded low latency control channels. In one embodiment, the location short TTI control channels is determined by detecting a short TTI control message at a beginning of a TTI and obtaining a duration of the short TTI in the detected short TTI control message. In one embodiment, the UE obtains one or more uplink resources, power control and CSI configurations based on corresponding downlink short TTI transmissions according to a mapping rule.