公开(公告)号：US20210266968A1

公开(公告)日：2021-08-26

申请号：US17315333

申请日：2021-05-09

Applicant: MediaTek Inc.

Inventor： Jiann-Ching Guey ,  Chun-Hsuan Kuo ,  Chien-Hwa Hwang ,  Chiou-Wei Tsai ,  Ming-Po Chang

IPC: H04W74/08 ,  H04W74/00 ,  H04W72/12 ,  H04W24/00 ,  H04W48/16

Abstract: Techniques and examples of efficient detection of a transmission session in New Radio unlicensed spectrum (NR-U) are described. An apparatus (e.g., user equipment (UE)) detects presence of an indication from a base station of a wireless network in an NR-U. The apparatus determines that a transmission opportunity (TXOP) follows the indication responsive to the detecting. The apparatus then receives a downlink (DL) transmission in the NR-U from the base station during the TXOP.

公开(公告)号：US10856332B2

公开(公告)日：2020-12-01

申请号：US16016005

申请日：2018-06-22

Applicant: MEDIATEK INC.

Inventor： Chiou-Wei Tsai ,  Xiu-Sheng Li ,  Chien-Hwa Hwang

IPC: H04W74/08 ,  H04W72/04 ,  H04W36/00 ,  H04L5/00 ,  H04W72/14 ,  H04W48/12

Abstract: A wireless communication method, base station, and user equipment (UE) for physical downlink control channel (PDCCH) in random access channel (RACH) procedure are provided. The UE may include a processor. The processor may obtains a first control resource set (CORESET) configuration for physical downlink control channels (PDCCHs) in the RACH procedure and obtaining a first search space configuration for the PDCCHs in the RACH procedure from a base station to monitor and receive the PDCCHs in the RACH procedure.

公开(公告)号：US20200322897A1

公开(公告)日：2020-10-08

申请号：US16835584

申请日：2020-03-31

Applicant: Mediatek Inc.

Inventor： Chien-Hwa Hwang ,  Ju-Ya Chen ,  Chien-Yi Wang ,  Pei-Kai Liao

IPC: H04W52/24 ,  H04L5/00 ,  H04W24/10 ,  H04L1/18 ,  H04W52/28

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a transmitting UE. The transmitting UE transmits a reference signal and data to one or more receiving UEs. The transmitting UE receives one or more response signals from the one or more receiving UEs on a particular resource element. Each of the one or more response signals represents at least one of (a) a respective indication based on a measurement at a respective receiving UE, of the one or more receiving UEs, transmitting the each response signal and (b) a respective acknowledgment from the respective receiving UE associated with the data. The transmitting UE determines a transmission power at the transmitting UE based on the respective indications. The transmitting UE transmits data to the one or more receiving UEs at the transmission power.

公开(公告)号：US10405355B2

公开(公告)日：2019-09-03

申请号：US15004196

申请日：2016-01-22

Applicant: MEDIATEK INC.

Inventor： Shiang-Jiun Lin ,  Pei-Kai Liao ,  Chien-Hwa Hwang

IPC: H04W74/08 ,  H04W74/00 ,  H04W72/12 ,  H04W72/14

Abstract: Methods and apparatus are provided for Msg3 collision resolutions. In one embodiment, the UE obtains a set of DMRS seeds and randomly selecting one to generate a DMRS sequence for the Msg3. The set of DMRS seeds is either generated based on a received cell-specific parameter or are received from the network. In another embodiment, the eNB, upon detecting the collision in Msg3, indicates a lowered MCS level for the Msg3 transmission in the RAR after the preamble detection. In another embodiment, the early termination of Msg3 transmission is used upon determining the collision of Msg3. In one embodiment, the eNB responds an ACK to a failed Msg3 to suspend the re-transmission of the Msg3. In another embodiment, the eNB sends a flag to cancel the mac-ContentionResolutionTimer and terminate the Msg3 transmission. The termination indication is either embedded in the acknowledgement signaling or sent through PDCCH signaling.

公开(公告)号：US10104674B2

公开(公告)日：2018-10-16

申请号：US15341846

申请日：2016-11-02

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Lung-Sheng Tsai ,  Yi-Ju Liao ,  Tsang-Wei Yu ,  Pei-Kai Liao

IPC: H04W4/00 ,  H04W72/08 ,  H04L25/02 ,  H04J11/00 ,  H04L1/00 ,  H04B7/0452 ,  H04W88/08 ,  H04W92/10

Abstract: A new air interface that is interference cancellation friendly is proposed. In one novel aspect, a novel code rate assignment with rate splitting is proposed. In one embodiment, a base station decomposes a codeword {x1} into two codewords {x1a} and {x1b}. The two codewords are applied with different code rates and/or modulation orders. More specifically, the code rate or modulation order of codeword {x1a} is set appropriately so that a victim UE can decode and cancel {x1a} under the channel quality of the victim UE. Typically, the channel quality of a victim UE is poorer than the channel quality of the intended UE. As a result, the MCS for {x1a} can be lower than the MCS for {x1b} such that the victim UE is able to apply CWIC to decode and cancel {x1a}.

公开(公告)号：US09973305B2

公开(公告)日：2018-05-15

申请号：US14980867

申请日：2015-12-28

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Yi-Ju Liao ,  Tze-Ping Low ,  Lung-Sheng Tsai

IPC: H04W72/12 ,  H04L1/18 ,  H04W52/26 ,  H04W52/24 ,  H04L1/00 ,  H04W28/06 ,  H04W28/22 ,  H04L5/00 ,  H04L5/14

CPC classification number: H04L1/1812 ,  H04L1/0067 ,  H04L1/1822 ,  H04L1/1845 ,  H04L1/1896 ,  H04L5/001 ,  H04L5/0023 ,  H04L5/0053 ,  H04L5/0069 ,  H04L5/14 ,  H04W28/065 ,  H04W28/22 ,  H04W52/243 ,  H04W52/262 ,  H04W52/267 ,  H04W72/12 ,  H04W72/1252

Abstract: When the codeword level interference cancellation (CW-IC) is used at the receiver in conjunction with the superposition coding scheme at the transmitter, it is helpful if the soft buffer at the receiver is reserved not only for the desired transport blocks (TBs) but also for the interfering TBs handled by the CW-IC. In so doing, the soft channel bits of interfering TBs at multiple (re)transmissions can be combined to enhance the success rate of data decoding. A soft buffer partition method for the soft channel bits of the desired and interfering TBs in the superposition coding scheme is proposed. The proposed method has a full flexibility in adjusting the soft buffer sizes for the desired and interfering TBs.

公开(公告)号：US20170134150A1

公开(公告)日：2017-05-11

申请号：US15341879

申请日：2016-11-02

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Lung-Sheng Tsai ,  Yi-Ju Liao ,  Tsang-We Yu ,  Pei-Kai Liao

IPC: H04L5/14 ,  H04L1/00 ,  H04L5/00 ,  H04W72/04 ,  H04B7/04

CPC classification number: H04L5/14 ,  H04B7/0452 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0041 ,  H04L1/0045 ,  H04L5/0055 ,  H04L5/0057 ,  H04W72/042 ,  H04W72/1231

Abstract: A new air interface that is interference cancellation friendly is proposed. In one novel aspect, addition information is provided between eNB and UE for interference cancellation. From eNB perspective, it provides assistance information to UEs for CWIC. The assistance information may include modulation order and code rate information of the PDSCH for data transmission that may cause interference to other UEs. From UE perspective, it provides feedback information to the eNB for MCS level assignment. The feedback information may include additional channel quality and interference condition information of a data transmission of a desired transport block with respect to the decoding of the desired transport block.

公开(公告)号：US09628251B2

公开(公告)日：2017-04-18

申请号：US14089334

申请日：2013-11-25

Applicant: MEDIATEK, INC.

Inventor： Shiang-Jiun Lin ,  Chien-Hwa Hwang ,  Xiangyang Zhuang

IPC: H04W24/08 ,  H04L5/14 ,  H04W72/04 ,  H04W72/12 ,  H04L12/923 ,  H04L5/00

CPC classification number: H04L5/14 ,  H04L5/005 ,  H04L5/0053 ,  H04L5/0094 ,  H04L5/1469 ,  H04L47/762 ,  H04W72/04 ,  H04W72/044 ,  H04W72/0446 ,  H04W72/12 ,  H04W72/1205 ,  H04W72/1252

Abstract: Methods for UE measurement enhancement in an adaptive TDD configuration network are proposed. In a first solution, the network provides an adaptive TDD indicator to the UE. In a second solution, the network provides an instantaneous TDD configuration to the UE. In a third solution, multiple TDD configurations are grouped as one TDD group, and the network adapts TDD configurations within the same TDD group. In a fourth solution, the network broadcasts a TDD reference configuration in SIB1, and adapts to another TDD configuration with DL super set constraint, i.e., the DL subframes of the other TDD configuration form a super set of the DL subframes of the broadcasted TDD reference configuration.

公开(公告)号：US20170048841A1

公开(公告)日：2017-02-16

申请号：US15235745

申请日：2016-08-12

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Yi-Ju Liao ,  Tsang-Wei Yu ,  Lung-Sheng Tsai ,  Pei-Kai Liao

IPC: H04W72/04 ,  H04B7/04 ,  H04L5/00

CPC classification number: H04B7/0452 ,  H04L5/0044 ,  H04L5/0048 ,  H04L27/3488

Abstract: A method of modulating and demodulating superposed signals for MUST scheme is proposed. A transmitter takes bit sequences intended for multiple receivers under MUST scheme to go through a “bit sequence to constellation points” mapper before entering the modulators to satisfy the Gray coding rule and to achieve high demodulation performance for the receivers. In a first method, each bit sequence is assigned for each constellation point on the constellation map to satisfy one or more conditions under different power split factors. In a second method, the constellation map is divided into sub-regions according to the clustering of the constellation points for bit sequence assignment. A near-UE may use an ML receiver for demodulation and decoding the superposed signal. A far-UE may use an ML receiver or an MMSE receiver for demodulation and decoding the superposed signal.

Abstract translation: 提出了一种用于MUST方案调制和解调叠加信号的方法。 发射机采用MUST方案下的多个接收机的比特序列，在进入调制器之前通过“位序列到星座点”映射器，以满足格雷编码规则，并为接收机实现高解调性能。 在第一种方法中，为星座图上的每个星座点分配每个比特序列以满足不同功率分割因子下的一个或多个条件。 在第二种方法中，星座图根据用于比特序列分配的星座点的聚类被划分成子区域。 近UE可以使用ML接收机来对叠加信号进行解调和解码。 远端UE可以使用ML接收机或MMSE接收机对叠加信号进行解调和解码。

公开(公告)号：US20170041906A1

公开(公告)日：2017-02-09

申请号：US15227204

申请日：2016-08-03

Applicant: MEDIATEK INC.

Inventor： Lung-Sheng Tsai ,  Pei-Kai Liao ,  Yi-Ju Liao ,  Chien-Hwa Hwang

IPC: H04W72/04 ,  H04L5/00 ,  H04L1/00

CPC classification number: H04L5/0062 ,  H04L1/0009 ,  H04L5/0037 ,  H04W52/262 ,  H04W52/34 ,  H04W52/346 ,  H04W72/1289

Abstract: Methods of enabling multiuser superposition transmission (MUST) in LTE systems are proposed. MUST operation allows simultaneous transmission for multiple co-channel users on the same time-frequency resources. A higher-layer signaling is used for configuring a UE to enable MUST in each transmission mode (TM). MUST is a sub-TM of each TM. When a UE is configured by higher layer to enable MUST, the UE will monitor new DCI formats supported by the configured TM with new fields carrying scheduling information of another co-channel UE. Dynamic switching between MUST and non-MUST operation is allowed. Mixed transmission schemes and precoders among co-channel UEs are also supported.

Abstract translation: 提出了在LTE系统中实现多用户叠加传输（MUST）的方法。 MUST操作允许在同一时间频率资源上同时传输多个同频道用户。 更高层的信令用于配置UE以在每个传输模式（TM）中启用MUST。 必须是每个TM的子TM。 当UE由更高级配置以启用MUST时，UE将监视由配置的TM支持的新的DCI格式，新的字段携带另一个同频道UE的调度信息。 允许在MUST和非MUST操作之间进行动态切换。 同时支持混合传输方案和预编码器。