公开(公告)号：US11632152B2

公开(公告)日：2023-04-18

申请号：US16468243

申请日：2017-01-09

Applicant: QUALCOMM Incorporated

Inventor： Yu Zhang ,  Chao Wei ,  Wanshi Chen

IPC: H04W24/08 ,  H04B7/0456 ,  H04L25/02

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for performing one or more over the air calibration procedures for reciprocity based uplink MIMO transmissions, for example, in new radio (NR).

公开(公告)号：US20230093589A1

公开(公告)日：2023-03-23

申请号：US17759605

申请日：2020-02-14

Applicant: QUALCOMM Incorporated

Inventor： Liangming Wu ,  Chenxi Hao ,  Yu Zhang ,  Chao Wei ,  Qiaoyu Li ,  Min Huang ,  Hao Xu

IPC: H04B7/06 ,  H04B7/0456

Abstract: A method includes receiving, by a user equipment (UE) device, a joint transmission of channel state information (CSI) reference signals (CSI-RS) from a first transmission and reception point (TRP) associated with a wireless network and at least a second TRP associated with the wireless network. The method further includes determining a joint rank parameter associated with the joint transmission and accessing, based on the joint rank parameter, a rank-to-port mapping codebook to determine a port index parameter. The method further includes, after determining the port index parameter, communicating, by the UE device, with one or more of the first TRP or the second TRP. Other aspects and features are also claimed and described.

公开(公告)号：US11533143B2

公开(公告)日：2022-12-20

申请号：US16963453

申请日：2019-02-06

Applicant: Chao Wei ,  Qiaoyu Li ,  Peng Cheng ,  QUALCOMM Incorporated

Inventor： Chao Wei ,  Qiaoyu Li ,  Peng Cheng

IPC: H04L5/00 ,  H04W52/32 ,  H04W72/12

Abstract: The present disclosure relates to wireless communications implemented by a user equipment (UE). The UE may receive a demodulation reference signal (DMRS) sequence grouping from a base station, select a DMRS sequence for transmission of DMRS based on the DMRS sequence grouping, and transmit uplink (UL) data along with the DMRS for UL transmission using contention-based protocol, wherein the DMRS is transmitted based on the selected DMRS sequence.

公开(公告)号：US11509367B2

公开(公告)日：2022-11-22

申请号：US17312074

申请日：2019-12-20

Applicant: Qualcomm Incorporated ,  Min Huang ,  Chao Wei ,  Chenxi Hao ,  Liangming Wu ,  Qiaoyu Li

Inventor： Min Huang ,  Chao Wei ,  Chenxi Hao ,  Liangming Wu ,  Qiaoyu Li

IPC: H04L23/02 ,  H04B7/0456 ,  H04B7/06

Abstract: Methods, systems, and devices for wireless communications are described that provide for channel state information (CSI) feedback for multiple discrete Fourier transform (DFT) beams on multiple transmission layers. A user equipment (UE) may report a total number of non-zero power DFT beams across all of the transmission layers. The UE may be configured with a total number of leading beams (Ktotal) across all of the transmission layers for which to provide high quantization feedback. When the total number of non-zero DFT beams across all the transmission layers exceeds the configured total number of leading beams across all the transmission layers, the UE may report high-resolution quantization feedback for Ktotal non-zero power precoding coefficients having the highest amplitude coefficients, and may report low-resolution quantization feedback for the remaining non-zero power precoding coefficients. A base station may receive the CSI feedback to determine a precoding matrix.

公开(公告)号：US11483049B2

公开(公告)日：2022-10-25

申请号：US16621390

申请日：2018-06-14

Applicant: Qualcomm Incorporated

Inventor： Chenxi Hao ,  Juan Montojo ,  Yu Zhang ,  Chao Wei ,  Wanshi Chen

IPC: H03K9/08 ,  H04B7/06 ,  H04W76/27 ,  H04W72/04

Abstract: The described techniques relate to improved methods, systems, devices, or apparatuses that support channel state information feedback for semi-open-loop and open-loop schemes. The described techniques provide for a user equipment (UE) to determine an open-loop, semi-open-loop, or closed-loop transmission scheme for deriving channel quality information (CQI). In the case of determined open-loop transmission scheme, the UE may select a transmission scheme corresponding to a time offset value and a precoder cycling granularity value. The UE may determine one or more of a time offset value, a precoder cycling granularity value, and a precoding matrix indicator (PMI) for a channel state information (CSI) report, and generate CQI accordingly. Additionally, the UE may include the determined values in the CSI report to indicate the transmission scheme used for the CQI derivation. Based on the CQI, the base station can then determine the transmission scheme and perform link adaption accordingly.

公开(公告)号：US11463906B2

公开(公告)日：2022-10-04

申请号：US16467882

申请日：2017-12-15

Applicant: QUALCOMM Incorporated

Inventor： Liangming Wu ,  Chao Wei ,  Yu Zhang

IPC: H04W72/04 ,  H04W24/10 ,  H04B7/06 ,  H04W28/06

Abstract: Methods and apparatus for implementing enhancements to advanced Channel State Information (CSI) reporting procedures are provided. A User Equipment (UE) receives at least one trigger message for reporting advanced CSI by the UE, and takes one or more actions to reduce at least one of feedback overhead or processing at the UE associated with the reporting.

公开(公告)号：US20220295567A1

公开(公告)日：2022-09-15

申请号：US17824796

申请日：2022-05-25

Applicant: QUALCOMM Incorporated

Inventor： Chao Wei ,  Jing Lei ,  Qiaoyu Li

IPC: H04W74/08 ,  H04W74/00 ,  H04L1/00 ,  H04L1/08

Abstract: Methods, systems, and devices for wireless communications are described. In a random access (RACH) procedure, a user equipment (UE) may transmit a first RACH message (e.g., RACH Message A (MsgA)) to a base station, which may include an indication of a modulation order, a maximum number of repetitions for RACH Message B (MsgB) data, or both. The base station may multiplex random access responses (RARs) for UEs into second RACH messages (e.g., RACH MsgBs) based on the indication(s) and may transmit these RACH MsgBs. The UE may receive and decode a downlink control information (DCI) portion of a RACH MsgB but may determine not to decode the data portion of the RACH MsgB if an indication in the DCI of the modulation order, the threshold number of repetitions, or both does not match the value reported by the UE. Otherwise, the UE may decode the full RACH MsgB.

公开(公告)号：US11342979B2

公开(公告)日：2022-05-24

申请号：US16638197

申请日：2018-08-10

Applicant: Qualcomm Incorporated

Inventor： Chenxi Hao ,  Liangming Wu ,  Yu Zhang ,  Hao Xu ,  Chao Wei ,  Wanshi Chen

IPC: H04B7/06 ,  H04B7/0456

Abstract: Methods, systems, and devices for wireless communication are described. In wireless systems supporting multiple-input, multiple-output (MIMO) transmissions, devices may implement beam-forming to improve reliability of communications. A user equipment (UE) may select a set of beams, and corresponding beam indices, for communication based on reference signals received from a base station. The UE may determine values corresponding to each of the beam indices using a scalable set of tables. For example, the UE may select a subset of the tables based on the number of selected beams, and may determine the values based on these tables. In this way, the UE may efficiently store sets of tables for multiple different configurations. The UE may sum the corresponding values to obtain a combination index value, and may transmit the combination index value to the base station. The base station may determine the selected beams based on this combination index value.

公开(公告)号：US11310011B2

公开(公告)日：2022-04-19

申请号：US16623009

申请日：2018-06-13

Applicant: Qualcomm Incorporated

Inventor： Chenxi Hao ,  Yu Zhang ,  Wanshi Chen ,  Chao Wei ,  Liangming Wu

IPC: H04W4/00 ,  H04L5/00 ,  H04B7/0456 ,  H04B7/06 ,  H04W24/10

Abstract: Methods, systems, devices, and apparatus for wireless communication are described that relate to transmission of a set of precoded reference signals, and using a physical resource group (PRG) size for the resources carrying the set of reference signals for channel estimation at a user equipment (UE). For example, a base station may apply a precoding matrix to a set of reference signals, and the reference signals may be configured on a set of resources. In such cases, the resources including these reference signals having a same precoding may be included in a PRG, and a size of the PRG may refer to a number of precoded reference signals for which the precoding is the same. Based on the received reference signals and the PRG size the UE may perform channel estimation based on the PRG size and transmit channel state information (CSI) to the base station.

公开(公告)号：US11283497B2

公开(公告)日：2022-03-22

申请号：US16599018

申请日：2019-10-10

Applicant: QUALCOMM Incorporated

Inventor： Yu Zhang ,  Chao Wei ,  Peng Cheng ,  Neng Wang ,  Jilei Hou

IPC: H04B7/0456 ,  H04L1/00 ,  H04W16/10 ,  H04L1/06 ,  H04L1/18 ,  H04B7/06 ,  H04B7/0452 ,  H04W16/28 ,  H04B7/0426

Abstract: Certain aspects of the present disclosure provide methods and apparatus for linear precoding in full-dimensional MIMO (FD-MIMO) systems. According to aspects, an eNB may compress a larger number of antenna elements to a smaller number of antenna ports. The eNB may use a port precoding matrix to transmit reference signals to a UE, receive feedback regarding CSI based on the reference signals, and transmit data to the UE, based on a mapping of multiple data layers and mapping of antenna ports to the physical antenna elements. Further, aspects include performing elevation beamforming by dynamically forming one or more vertical sectors based on UE feedback in the elevation domain.