公开(公告)号：US11637603B2

公开(公告)日：2023-04-25

申请号：US16941287

申请日：2020-07-28

Applicant: QUALCOMM Incorporated

Inventor： Chao Wei ,  Wanshi Chen ,  Peter Gaal ,  Yu Zhang

IPC: H04B7/06 ,  H04B7/0456 ,  H04L5/00 ,  H04W72/04 ,  H04W88/02

Abstract: Mechanisms for reduction of channel state information (CSI) feedback overhead are disclosed for full dimensional multiple input, multiple output (FD-MIMO) systems with large dimension antenna ports. In one aspect, rank-dependent CSI antenna port measurements are used in order to limit the number of antenna ports for high rank CSI reporting. Another aspect allows a user equipment (UE) to select subband feedback for aperiodic CSI porting on an uplink shared channel when the UE is to report subband quality and precoding indicators. Another aspect provides for on-demand CSI feedback that dynamically configures CSI feedback parameters. To reduce the signaling overhead, the multiple parameter sets may be pre-configured with different values for dynamic reporting parameters.

公开(公告)号：US11632160B2

公开(公告)日：2023-04-18

申请号：US16982983

申请日：2019-04-03

Applicant: QUALCOMM Incorporated

Inventor： Liangming Wu ,  Yu Zhang ,  Chenxi Hao ,  Qiaoyu Li ,  Hao Xu ,  Wanshi Chen

IPC: H04B7/06 ,  H04B7/0456 ,  H04W28/06

Abstract: Certain aspects of the present disclosure provide techniques for reducing overhead for channel state information (CSI). Certain aspects provide a method for wireless communication. The method generally includes receiving a channel state information reference signal (CSI-RS), determining one or more feedback components associated with a CSI feedback type based on the CSI-RS, identifying that a payload of the one or more feedback components is to be compressed, compressing the payload, and reporting the compressed payload.

公开(公告)号：US11611378B2

公开(公告)日：2023-03-21

申请号：US17028974

申请日：2020-09-22

Applicant: QUALCOMM Incorporated

Inventor： Chao Wei ,  Wanshi Chen ,  Peter Gaal ,  Yu Zhang

IPC: H04B7/0456 ,  H04B7/06 ,  H04B7/17 ,  H04B7/26

Abstract: Enhanced channel state information (CSI) feedback is disclosed for full dimensional multiple input, multiple output (FD-MIMO) operations. In one aspect, a single CSI process is defined that is configured with an azimuth and elevation CSI-reference signal (RS) ports. A user equipment (UE) will send a precoding matrix indictor (PMI) report including a precoding matrix indicator (PMI) for the azimuth ports and a PMI for the elevation ports. One of the PMIs is assigned a low rank. The base station will use the two PMIs to create a whole channel precoding matrix. In another aspect, a single CSI process is configured having a plurality of CSI-RS resources. The UE generates channel measurement information for each of the CSI-RS resources, but only sets a CSI report to the base station of a subset of the total number of resources.

公开(公告)号：US11546029B2

公开(公告)日：2023-01-03

申请号：US17310312

申请日：2020-01-28

Applicant: Qualcomm Incorporated

Inventor： Joseph Binamira Soriaga ,  Pavan Kumar Vitthaladevuni ,  Bo Chen ,  Ruifeng Ma ,  Yu Zhang ,  Alexandros Manolakos ,  Tingfang Ji

IPC: H04B7/0456 ,  H04B7/06 ,  H04L1/00 ,  H04L5/00

Abstract: Methods, systems, and devices for wireless communications are described. Techniques described herein provide for a user equipment (UE) receiving a set of downlink reference signals associated with a downlink channel. In some cases, the set of downlink reference signals may include a channel state information reference signals (CSI-RS). The UE may calculate a transmission rank and a channel quality based on the received set of downlink reference signals. In some cases, the indication of the transmission rank may include a rank indication (RI), and the indication of the channel quality includes a channel quality indicator (CQI). The UE may then transmit the indications of the transmission rank and the channel quality using an uplink control channel, and may transmit an indication of a remaining channel state feedback using a precoded uplink reference signal.

公开(公告)号：US11496193B2

公开(公告)日：2022-11-08

申请号：US17054234

申请日：2019-05-09

Applicant: QUALCOMM Incorporated

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

IPC: H04B7/06 ,  H04L5/00 ,  H04W24/08 ,  H04W24/10

Abstract: Certain aspects of the present disclosure provide techniques for aperiodic channel state information (A-CSI) feedback scheduling for cross-carriers. Certain aspects provide a method for wireless communication. The method generally includes receiving on a first component carrier (CC) signaling indicating an aperiodic channel state information (CSI) report request for a plurality of CCs; determining schedules for at least CSI reference signal (CSI-RS) transmissions on the CCs based on the received signaling; monitoring CSI-RS transmissions on the CCs according to the determined schedules; and reporting CSI feedback based on CSI-RS measurements of the CSI-RS transmissions.

公开(公告)号：US11490413B2

公开(公告)日：2022-11-01

申请号：US16633399

申请日：2018-09-07

Applicant: QUALCOMM Incorporated ,  Yu Zhang ,  Hao Xu ,  Chao Wei ,  Peng Cheng ,  Wanshi Chen ,  Peter Gaal ,  Durga Prasad Malladi

Inventor： Yu Zhang ,  Hao Xu ,  Chao Wei ,  Peng Cheng ,  Wanshi Chen ,  Peter Gaal ,  Durga Prasad Malladi

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

Abstract: Certain aspects of the present disclosure generally relate to wireless communication. More particularly, certain aspects of the present disclosure relate to early termination of a downlink channel repetition transmission, early termination of an uplink channel repetition, and/or determination of a plurality of beams for a repetition transmission. Numerous other aspects are provided.

公开(公告)号：US11463297B2

公开(公告)日：2022-10-04

申请号：US17264261

申请日：2018-08-07

Applicant: QUALCOMM Incorporated

Inventor： Chenxi Hao ,  Yu Zhang ,  Liangming Wu ,  Hao Xu ,  Wanshi Chen ,  Peter Gaal

IPC: H04L23/02 ,  H04L27/34 ,  H04B17/336 ,  H04B17/373 ,  H04L5/00

Abstract: Certain aspects of the present disclosure provide techniques for adaptive modulo base selection for non-linear precoding. Aspects provide a method for wireless communications that can be performed by a base station (BS). The BS adaptively selects a modulo base for a data stream for at least one user equipment (UE) in a transmission to one or more UEs. The BS selects the modulo base based on one or more parameters. The BS transmits a signal for at least one UE of the one or more UEs to identify the selected modulo base. The BS performs the transmission to the one or more UEs. The UE receives the transmission from the BS and the signal for the identification of the selected modulo base. Based on the signal, the UE determines the modulo base for at least one data stream in the transmission and decodes the data stream using the modulo base.

公开(公告)号：US11424790B2

公开(公告)日：2022-08-23

申请号：US17424097

申请日：2020-01-20

Applicant: QUALCOMM Incorporated

Inventor： Chenxi Hao ,  Parisa Cheraghi ,  Yu Zhang ,  Lei Xiao ,  Peter Gaal ,  Wanshi Chen ,  Alexei Yurievitch Gorokhov

IPC: H04B7/02 ,  H04B7/0417 ,  H04B7/0456

Abstract: A user equipment (UE) may utilize frequency domain (FD) compression for reporting channel state information (CSI) including a precoding matrix indicator (PMI). The UE may receive a CSI configuration specifying a first set of configured FD units to be reported. The UE may determine a first number of FD units based on the first set of configured FD units. The UE may select a second number of FD units that is greater than or equal to the first number of FD units. The UE may calculate, for one or more layers, a PMI for a second set of FD units including a number of FD units equal to the second number of FD units. The UE may allocate, according to a mapping rule, a number of PMIs for the first set of FD units to a subset of the PMIs for the second set of FD units.

公开(公告)号：US11277243B2

公开(公告)日：2022-03-15

申请号：US16467688

申请日：2018-01-06

Applicant: QUALCOMM Incorporated

Inventor： Chenxi Hao ,  Xiaohui Liu ,  Chao Wei ,  Yu Zhang

IPC: H04L5/00 ,  H04B7/06

Abstract: Certain aspects of the present disclosure provide procedures for transparent demodulation reference signal (DM-RS) design. According to certain aspects, a method of wireless communication by a base station (BS) is provided. The method generally includes transmitting one or more pilots based on at least one precoder used for transmitting data. The BS transmits the data based on the at least one precoder. A method by a user equipment (UE) includes receiving one or more pilots based on at least one precoder used for transmitting data on a channel. The UE estimates interference based on the one or more pilots and the UE decodes the data transmission based on the interference estimate.

公开(公告)号：US11171737B2

公开(公告)日：2021-11-09

申请号：US15781671

申请日：2015-12-09

Applicant: QUALCOMM Incorporated

Inventor： Xiaohui Liu ,  Neng Wang ,  Yu Zhang ,  Jilei Hou

IPC: H04L27/00 ,  H04L1/00 ,  H04L1/18

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for flexible resource mapping and modulation and coding scheme (MCS) determination in wireless communication systems. According to certain aspects, a method for wireless communications that may be performed by a transmitter is provided. The method generally includes determining MCSs to use for each of multiple portions of a transport block and transmitting the portions of the transport block according to the determined MCSs to a wireless node. Flexible MCS and resource mapping determination may improve demodulation performance for code blocks that are far from pilots.