公开(公告)号：US20180279273A1

公开(公告)日：2018-09-27

申请号：US15933591

申请日：2018-03-23

Applicant: MediaTek Inc.

Inventor： Weidong Yang ,  Lung-Sheng Tsai ,  Chien-Hwa Hwang

IPC: H04W72/04

CPC classification number: H04W72/042 ,  H04B7/022 ,  H04B7/0613 ,  H04W72/0446

Abstract: Various solutions for downlink control signal design with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a first downlink control signal from a first source. The apparatus may receive a second downlink control signal from a second source. The apparatus may further receive downlink data according to the first downlink control signal and the second downlink control signal. The first downlink control signal and the second downlink control signal may be identical. The first source and the second source may be different.

公开(公告)号：US20180278316A1

公开(公告)日：2018-09-27

申请号：US15933610

申请日：2018-03-23

Applicant: MediaTek Inc.

Inventor： Weidong Yang ,  Lung-Sheng Tsai

IPC: H04B7/06

Abstract: A user equipment (UE) utilizes a first group of antenna ports at the UE for transmitting and receiving while utilizing a second group of antenna ports for receiving but not transmitting. The UE transmits to a base station (BS) a sounding reference signal (SRS) via the first group of antenna ports through a first channel of a communication link between the UE and the BS. The UE receives from the BS a channel state information reference signal (CSI-RS) via the first and second groups of antenna ports through the first channel and a second channel of the communication link. The UE determines an estimated channel response and a matrix such that a product of the matrix and a channel response of the first channel approximates a channel response of the second channel. The UE transmits to the BS a CSI feedback indicating at least the matrix.

公开(公告)号：US09985700B2

公开(公告)日：2018-05-29

申请号：US15150001

申请日：2016-05-09

Applicant: MEDIATEK INC.

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

IPC: H04B7/0452 ,  H04B17/336 ,  H04W72/12 ,  H04L5/00 ,  H04L27/00

CPC classification number: H04B7/0452 ,  H04B7/063 ,  H04B7/0632 ,  H04B17/336 ,  H04J11/004 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/0028 ,  H04L5/0037 ,  H04L5/0048 ,  H04L5/006 ,  H04L5/0069 ,  H04L27/0008 ,  H04L27/183 ,  H04L27/3488 ,  H04W72/1231

Abstract: A method of performing downlink multiuser superposition transmission (MUST) with enhanced channel state information (CSI) feedback is proposed. When a user equipment (UE) reports CQI/SINR feedback for RI=RANK-2, the UE also reports a single beam CQI/SINR feedback for RI=RANK1. As a result, the scheduling base station can calculate the actual SINRs based on different MUST scenarios and thereby determining appropriate modulation and coding scheme (MCS) for the UE. Furthermore, if the granularity of the CQI table cannot reflect the high values of the single beam SINR, then a predefined scaling factor (0

公开(公告)号：US09893843B2

公开(公告)日：2018-02-13

申请号：US14980750

申请日：2015-12-28

Applicant: MEDIATEK INC.

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

IPC: H04W4/00 ,  H04L1/18 ,  H04W52/26 ,  H04W52/24 ,  H04W72/12 ,  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: Methods for rate matching with soft buffer size setting at the transmitter and soft channel bits storage at the receiver for superposition coding are proposed. In the superposition coding scheme, a transport block intended to one UE needs to be decoded by another UE's receiver. However, the soft buffer sizes per code block of the two receivers may not be the same since the size depends on the UE category. The base station can signal the soft buffer size used at the transmitter for rate matching to the UEs for superposition decoding. A UE stores information bits associated with an interfering signal in its soft buffers in accordance with the soft buffer size used at the transmitter for rate matching. As a result, the UE can decode and subtract the interfering signal from the desired signal for superposition coding.

公开(公告)号：US09680578B2

公开(公告)日：2017-06-13

申请号：US14980991

申请日：2015-12-28

Applicant: MEDIATEK INC.

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

IPC: H04B15/00 ,  H04L1/18 ,  H04L12/861 ,  H04L5/00

CPC classification number: H04B15/00 ,  H04L1/1812 ,  H04L1/1822 ,  H04L1/1835 ,  H04L1/1845 ,  H04L5/0023 ,  H04L5/0055 ,  H04L49/9057

Abstract: A method is proposed to enable a UE performing codeword level interference cancellation (CW-IC) to know whether an interfering transport block (TB) is a new transmission or retransmission. With this knowledge, the UE knows whether the soft channel bits stored in a soft buffer are to be discarded or combined with the soft channel bits newly obtained.

公开(公告)号：US20170048840A1

公开(公告)日：2017-02-16

申请号：US15235695

申请日：2016-08-12

Applicant: MEDIATEK INC.

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

IPC: H04W72/04 ,  H04L5/00

CPC classification number: H04L27/3488 ,  H04J11/0046 ,  H04L5/0046 ,  H04L27/3483

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实现接收机的高解调性能。 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。