公开(公告)号：US20220376764A1

公开(公告)日：2022-11-24

申请号：US17741188

申请日：2022-05-10

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Venkata Siva Santosh Ganji ,  Ahsan Aziz ,  James Wesley McCoy

IPC: H04B7/06 ,  H04W72/04 ,  H04B17/318 ,  H04W24/10 ,  H04B17/336 ,  H04W80/02 ,  H04W16/28

Abstract: A user equipment device (UE) determines a beam coherence interval metric, which is a measure of stability of a beam pair over time based on a set of beam coherence intervals measured by the UE. The beam pair comprises a receive beam of the UE and a transmit beam of a base station transmitting to the UE. A beam coherence interval comprises a time duration within which a quality of a signal received on the UE receive beam remains within one of a plurality of signal quality bins. The UE also determines a hysteresis value based on the beam coherence interval metric and uses the hysteresis value to decide to switch from an active receive beam to a different receive beam that has a signal quality higher than the active receive beam by at least the hysteresis value. Alternatively, the base station determines and sends the UE the hysteresis value.

公开(公告)号：US11381297B2

公开(公告)日：2022-07-05

申请号：US16600495

申请日：2019-10-12

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Venkata Siva Santosh Ganji ,  Ahsan Aziz ,  James Wesley McCoy

IPC: H04W16/28 ,  H04B7/06 ,  H04W72/04 ,  H04B17/318 ,  H04W24/10 ,  H04B17/336 ,  H04W80/02

Abstract: A UE determines a beam coherence interval metric that is a measure of stability of a beam pair over time based on a set of beam coherence intervals measured by the UE. The beam pair comprises a UE receive beam and a base station transmit beam. A beam coherence interval comprises a time duration within which a quality of a signal received on the UE receive beam remains within one of a plurality of signal quality bins. The UE reports the metric to the base station. The base station may update beam management resource and reporting configurations to the UE based on the metric. The UE may also use the metric to determine a hysteresis value useable by the UE to decide to switch from an active receive beam to a different receive beam having a higher signal quality by at least the hysteresis value.

公开(公告)号：US10951300B2

公开(公告)日：2021-03-16

申请号：US16100753

申请日：2018-08-10

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Achim Nahler ,  James Wesley McCoy

IPC: H04W16/28 ,  H04B7/0413 ,  H04B7/08 ,  H04B17/382 ,  H04B7/06 ,  H04W24/10 ,  H04B17/318 ,  H04B17/21 ,  H04B17/24 ,  H04L12/26 ,  H04W72/08 ,  H04W72/04 ,  H04B17/10 ,  H04L5/00

Abstract: A base station (BS)/user equipment (UE) for performing radio frequency beam management and recovery in communication with a UE/BS. The BS/UE includes a processor and a memory that stores first and second thresholds. The processor evaluates a beam quality metric against the first and second thresholds, performs beam switching and/or beam broadening in response to determining the beam quality metric falls below the first threshold, and performs a beam failure recovery procedure in response to determining the beam quality metric falls below the second threshold.

公开(公告)号：US10855346B2

公开(公告)日：2020-12-01

申请号：US14703214

申请日：2015-05-04

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Ian C. Wong ,  Karl F. Nieman ,  Nikhil U. Kundargi

IPC: H04L7/00 ,  H04B7/0413 ,  H04B7/0456 ,  H04B7/024 ,  H04L5/00 ,  H04W56/00 ,  H04B7/0452 ,  H04W88/08

Abstract: Techniques are disclosed relating to a massive MIMO base station architecture. In some embodiments, a base station is configured to combine signals received by multiple antennas and, for at least a subset of processing elements included in the base station, each processing element is configured to operate on a different portion of the combined signals. In these embodiments, each portion includes signals from multiple antennas. In some embodiments, the portions are different time and/or frequency portions of the combined signals. In some embodiments, this distributed processing may allow the number of antennas of the base station to scale dramatically, provide dynamic re-configurability, facilitate real-time reciprocity-based precoding, etc.

公开(公告)号：US20200344023A1

公开(公告)日：2020-10-29

申请号：US16871494

申请日：2020-05-11

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Achim Nahler

IPC: H04L5/00 ,  H04L27/26 ,  H04B7/06 ,  H04W56/00

Abstract: A wireless base station or user equipment (BS or UE) includes a receiver configured to receive a frequency division multiplexed (FDM) symbol transmitted by another wireless BS or UE, and a processor. The processor is configured to process the received FDM symbol to obtain its equalized FDM data subcarriers, generate a CPE estimate using the equalized FDM data subcarriers, and send to the other wireless BS or UE control messages that indicate a CPE compensation performance level using the CPE estimate. The other wireless BS or UE is enabled by the control messages to adapt a density in time and/or frequency of embedded pilot symbols within FDM symbols subsequently transmitted to the wireless BS or UE.

公开(公告)号：US20190280741A1

公开(公告)日：2019-09-12

申请号：US16392039

申请日：2019-04-23

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Karl F. Nieman ,  Junmo Sung

IPC: H04B7/0413 ,  H04L5/00 ,  H04W72/04 ,  H04W72/08 ,  H04L25/02 ,  H04B17/11 ,  H04B17/14 ,  H04L27/26

Abstract: A wireless cellular base station (BS) transmitter transmits a downlink calibration pilot symbol. A receiver receives from a user equipment (UE) an uplink calibration pilot symbol and an effective downlink channel estimate transmitted by the UE. The effective downlink channel estimate is computed by the UE using the downlink calibration pilot symbol received from the BS. Processing devices compute an effective uplink channel estimate using the uplink calibration pilot symbol received from the UE and compute channel reciprocity calibration coefficients using the effective downlink channel estimate received from the UE and the effective uplink channel estimate computed by the BS. The BS includes multiple antennas, and the BS computes the channel reciprocity calibration coefficients for each antenna. Alternatively, the uplink channel estimate received by the BS is an inverted version of the effective downlink channel estimate, which the processing devices use for channel reciprocity compensation.

公开(公告)号：US20210111779A1

公开(公告)日：2021-04-15

申请号：US16600495

申请日：2019-10-12

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Venkata Siva Santosh Ganji ,  Ahsan Aziz ,  James Wesley McCoy

IPC: H04B7/06 ,  H04B17/318 ,  H04W80/02 ,  H04W72/04 ,  H04W24/10 ,  H04B17/336

Abstract: A UE determines a beam coherence interval metric that is a measure of stability of a beam pair over time based on a set of beam coherence intervals measured by the UE. The beam pair comprises a UE receive beam and a base station transmit beam. A beam coherence interval comprises a time duration within which a quality of a signal received on the UE receive beam remains within one of a plurality of signal quality bins. The UE reports the metric to the base station. The base station may update beam management resource and reporting configurations to the UE based on the metric. The UE may also use the metric to determine a hysteresis value useable by the UE to decide to switch from an active receive beam to a different receive beam having a higher signal quality by at least the hysteresis value.

公开(公告)号：US10958314B2

公开(公告)日：2021-03-23

申请号：US16392039

申请日：2019-04-23

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Karl F. Nieman ,  Junmo Sung

IPC: H04B7/0413 ,  H04B17/11 ,  H04L5/00 ,  H04B17/14 ,  H04L27/26 ,  H04L25/02 ,  H04L25/03 ,  H04W72/04 ,  H04W72/08 ,  H04W88/08 ,  H04B7/06 ,  H04W88/02

Abstract: A wireless cellular base station (BS) transmitter transmits a downlink calibration pilot symbol. A receiver receives from a user equipment (UE) an uplink calibration pilot symbol and an effective downlink channel estimate transmitted by the UE. The effective downlink channel estimate is computed by the UE using the downlink calibration pilot symbol received from the BS. Processing devices compute an effective uplink channel estimate using the uplink calibration pilot symbol received from the UE and compute channel reciprocity calibration coefficients using the effective downlink channel estimate received from the UE and the effective uplink channel estimate computed by the BS. The BS includes multiple antennas, and the BS computes the channel reciprocity calibration coefficients for each antenna. Alternatively, the uplink channel estimate received by the BS is an inverted version of the effective downlink channel estimate, which the processing devices use for channel reciprocity compensation.

公开(公告)号：US10447352B2

公开(公告)日：2019-10-15

申请号：US15674282

申请日：2017-08-10

Applicant: National Instruments Corporation

Inventor： Nikhil U. Kundargi ,  Karl F. Nieman ,  Junmo Sung

IPC: H04B7/0413 ,  H04B17/11 ,  H04L5/00 ,  H04L25/02 ,  H04W72/04 ,  H04W72/08 ,  H04L27/26 ,  H04B17/14 ,  H04W88/08 ,  H04B7/06 ,  H04W88/02

Abstract: A wireless cellular base station (BS) transmitter transmits a downlink calibration pilot symbol. A receiver receives from a user equipment (UE) an uplink calibration pilot symbol and an effective downlink channel estimate transmitted by the UE. The effective downlink channel estimate is computed by the UE using the downlink calibration pilot symbol received from the BS. Processing devices compute an effective uplink channel estimate using the uplink calibration pilot symbol received from the UE and compute channel reciprocity calibration coefficients using the effective downlink channel estimate received from the UE and the effective uplink channel estimate computed by the BS. The BS includes multiple antennas, and the BS computes the channel reciprocity calibration coefficients for each antenna. Alternatively, the uplink channel estimate received by the BS is an inverted version of the effective downlink channel estimate, which the processing devices use for channel reciprocity compensation.

公开(公告)号：US10201020B2

公开(公告)日：2019-02-05

申请号：US15708664

申请日：2017-09-19

Applicant: National Instruments Corporation

Inventor： James Wesley McCoy ,  Nikhil U. Kundargi ,  Karl F. Nieman, Jr. ,  Lothar Wenzel ,  Marcus Monroe

IPC: H04W74/08 ,  H04W72/04 ,  H04B7/0456 ,  H04B7/0452

Abstract: A system and method for performing multi-user random access procedures in a mobile telecommunications network between a base station and a user equipment (UE) having a plurality of antennas includes transmitting a random access signal set (RASS) message using one or more antennas of the plurality of UE antennas. In response to receiving the RASS message, the base station transmitting a random access response physical downlink control channel (RAR-PDCCH) message. In response to receiving the RAR-PDCCH message, transmitting a reciprocity reference signal set (RRSS) signal using the plurality of UE antennas.