公开(公告)号：US11516051B2

公开(公告)日：2022-11-29

申请号：US16270486

申请日：2019-02-07

Applicant: Samsung Electronics Co., Ltd.

Inventor： Vikram Chandrasekhar ,  Jianzhong Zhang ,  Saidhiraj Amuru ,  Yeqing Hu ,  Hao Chen

IPC: H04L25/02 ,  G06N3/08 ,  G06N20/00 ,  G06N3/04

Abstract: An apparatus for performing a wireless communication includes a communication interface configured to measure uplink (UL) Sounding Reference Signals (SRSs) transmitted from a mobile client device, and at least one processor configured to buffer a number of uplink (UL) SRS measurements derived from UL SRS transmissions of the mobile client device, the number of UL SRS measurements exceeding a threshold, extract features from UL SRS measurements, obtain a machine learning (ML) classifier for determining a category to be used for estimating mobility associated with the mobile client device, and determine the category of the mobile client device by applying the extracted features to the ML classifier. Methods and apparatus extract the features of either a set of power spectrum density measurements or a set of pre-processed frequency domain real and imaginary portions of UL SRS measurements and feed the features to an AI classifier for UE speed estimation.

公开(公告)号：US20210281334A1

公开(公告)日：2021-09-09

申请号：US17188934

申请日：2021-03-01

Applicant: Samsung Electronics Co., Ltd.

Inventor： Yang Li ,  Junmo Sung ,  Rui Wang ,  Yeqing Hu

IPC: H04B17/18 ,  H04B17/10 ,  H04B17/12 ,  H04L25/02 ,  H04B17/26 ,  H04W72/04 ,  H04W56/00 ,  H04W80/02

Abstract: A base station (UE) is configured to perform a computer-implemented method for antenna fault detection and correction. The computer-implemented method includes acquiring one or more sounding reference signals (SRSs) received from at least one gNB antenna; detecting an antenna failure based on the one or more SRSs; estimating a noise power based on the antenna failure and a history of received SRSs; detecting a missing SRS based on the noise power and the history of received SRSs; and handling the missing SRS. Handling the missing SRS is based on performing at least one of: replacing an SRS measurement with a predicted SRS value for the missing SRS when the predicted SRS is available; or avoiding use of the missing SRS in a sequential SRS prediction when the predicted SRS is unavailable.

公开(公告)号：US20210218612A1

公开(公告)日：2021-07-15

申请号：US17143957

申请日：2021-01-07

Applicant: Samsung Electronics Co., Ltd.

Inventor： Junmo Sung ,  Yang Li ,  Rui Wang ,  Yeqing Hu ,  Jin Yuan ,  Jianzhong Zhang

IPC: H04L27/26 ,  H04L25/02 ,  H04L5/00

Abstract: Methods and apparatuses in a wireless communication system. A method of operating a base station (BS) includes receiving a set of uplink signals; estimating, based on a subset of the set of uplink signals, uplink channels; estimating a timing offset (TO) and a frequency offset (FO) for a subset of the estimated uplink channels; compensating, based on the estimated TO and FO, the subset of the estimated uplink channels to generate TO and FO compensated uplink channel estimates; and generating channel prediction information based on the compensated subset of the estimated uplink channels.

公开(公告)号：US10911111B2

公开(公告)日：2021-02-02

申请号：US16594918

申请日：2019-10-07

Applicant: Samsung Electronics Co., Ltd.

Inventor： Yeqing Hu ,  Ahmed Ibrahim ,  Young-Han Nam ,  Jianzhong Zhang ,  Eun Yong Kim

IPC: H04L1/02 ,  H04B7/0456 ,  H04B7/0417 ,  H04B7/0452

Abstract: A method of a base station (BS) in a wireless communication system is provided, The method comprises: receiving, from a user equipment (UE), a 1st layer sounding reference signal (SRS); arranging the 1st layer SRS based on two antenna polarizations of an antenna system of the BS; identifying a dominant direction of a channel based on the 1st layer SRS; identifying a coefficient between two antenna polarizations based on the 1st layer SRS; constructing a 2-layer channel matrix based on the identified dominant direction and the identified coefficient; and transmitting, to the UE, a downlink signal via the antenna system based on the constructed 2-layer channel matrix.

公开(公告)号：US10797913B2

公开(公告)日：2020-10-06

申请号：US16252252

申请日：2019-01-18

Applicant: Samsung Electronics Co., Ltd.

Inventor： Yeqing Hu ,  Rui Wang ,  Boon Loong Ng ,  Young-Han Nam ,  Jin Yuan ,  Gary Xu ,  Jianzhong Zhang

IPC: H04L25/02 ,  H04L5/14 ,  H04B7/10 ,  H04B7/0413 ,  H04B7/0456 ,  H04L5/00

Abstract: Reciprocity base frequency division duplex (FDD) multiple-input-multiple-output (MIMO) downlink (DL) channel Channel-State Information (CSI) acquisition is provided. A base station (BS) includes a transceiver configured to measure uplink (UL) sounding reference signals (SRSs) at a UL carrier frequency, using two polarization components of an antenna array of the BS, and a processor configured to determine a quantity of propagation paths between the BS and a user equipment (UE), for each of the determined propagation paths, extract propagation parameters from the UL SRS measurements, for each of the determined propagation paths, predict a downlink (DL) channel based on the extracted propagation parameters and a DL carrier frequency, and generate a precoding channel matrix for the UE by summing the predicted DL channels for each of the determined propagation paths and for each of the two polarization components of the antenna array of the BS.

公开(公告)号：US20190341978A1

公开(公告)日：2019-11-07

申请号：US16256898

申请日：2019-01-24

Applicant: Samsung Electronics Co., Ltd.

Inventor： Ahmed Ibrahim ,  Young-Han Nam ,  Yeqing Hu ,  Eun Yong Kim ,  Jianzhong Zhang

IPC: H04B7/0456 ,  H04B7/06 ,  H04B17/309

Abstract: Base station (BS) capable of beamforming in a wireless communication includes a transceiver comprising an antenna array, the transceiver configured to measure SRS from a UE, using at least one portion of the antenna array, and a processor configured to select at least one UL beam vector based on an SRS measurement from a UL beam-codebook comprising a set of beam weight vectors, determine at least one DL beam weight vector corresponding to each of the selected at least one UL beam weight vector, transmit a beamformed CSI-RS by applying the at least one DL beam weight vector to the antenna array, receive a CSI feedback including a PMI from the UE, wherein the PMI is determined based on the beamformed CSI-RS, and construct a precoding channel matrix for the UE based on the PMI and the at least one DL beam weight vector.

公开(公告)号：US20190229953A1

公开(公告)日：2019-07-25

申请号：US16252252

申请日：2019-01-18

Applicant: Samsung Electronics Co., Ltd.

Inventor： Yeqing Hu ,  Rui Wang ,  Boon Loong Ng ,  Young-Han Nam ,  Jin Yuan ,  Gary Xu ,  Jianzhong Zhang

IPC: H04L25/02 ,  H04B7/0413 ,  H04B7/10 ,  H04L5/14

Abstract: Reciprocity base frequency division duplex (FDD) multiple-input-multiple-output (MIMO) downlink (DL) channel Channel-State Information (CSI) acquisition is provided. A base station (BS) includes a transceiver configured to measure uplink (UL) sounding reference signals (SRSs) at a UL carrier frequency, using two polarization components of an antenna array of the BS, and a processor configured to determine a quantity of propagation paths between the BS and a user equipment (UE), for each of the determined propagation paths, extract propagation parameters from the UL SRS measurements, for each of the determined propagation paths, predict a downlink (DL) channel based on the extracted propagation parameters and a DL carrier frequency, and generate a precoding channel matrix for the UE by summing the predicted DL channels for each of the determined propagation paths and for each of the two polarization components of the antenna array of the BS.