公开(公告)号：US10432374B2

公开(公告)日：2019-10-01

申请号：US15621257

申请日：2017-06-13

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Taesang Yoo ,  Juan Montojo ,  Zhifei Fan ,  Renqiu Wang ,  Yi Huang

IPC: H04L12/28 ,  H04L5/00 ,  H04J11/00 ,  H04L1/16 ,  H04W72/04 ,  H04B7/0456 ,  H04B7/06 ,  H04L1/00

Abstract: Aspects of the present disclosure describe receiving an indication of a covariance matrix from an access point, receiving downlink signaling from the access point, deriving, based at least in part on the covariance matrix or the downlink signaling, one or more precoders for uplink communications over an uplink channel, and indicating, based at least in part on the one or more precoders, uplink channel feedback to the access point.

公开(公告)号：US10397888B2

公开(公告)日：2019-08-27

申请号：US15725811

申请日：2017-10-05

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Zhifei Fan ,  Taesang Yoo

IPC: H04W56/00 ,  H04L5/00 ,  H04L25/02 ,  H04W88/08 ,  H04W24/10

Abstract: Phase compensation in a new radio (NR) coordinated multipoint (CoMP) environment is discussed. A base station may synchronize the phase between one or more additional base stations in a CoMP group serving one or more user equipments (UEs). A base station estimates an uplink channel based on a sounding reference signal (SRS) received from a given UE. The base station transmits a phase synchronization reference signal (PSRS) modulated using the uplink channel estimate. The UE can measure the phase and/or timing drift from the PSRS and then will report the compensation information for the phase and timing drift back to the base station. The base station may then use the compensation information to adjust transmission characteristics for the CoMP group.

公开(公告)号：US10397796B2

公开(公告)日：2019-08-27

申请号：US15177928

申请日：2016-06-09

Applicant: QUALCOMM Incorporated

Inventor： Jing Sun ,  Tao Luo ,  Taesang Yoo ,  Xiaoxia Zhang ,  Siddhartha Mallik

IPC: H04W72/08 ,  H04W16/14 ,  H04W74/08 ,  H04W72/12 ,  H04W84/12

Abstract: Techniques are described for wireless communication. One method of wireless communication includes receiving, at a first user equipment (UE), a first communication over a shared radio frequency spectrum band from a first base station. The first communication includes a pre-grant communication associated with a downlink transmission or a grant of uplink resources associated with an uplink transmission. The method further includes determining, based at least in part on receiving the first communication, whether a channel reservation signal is detected over the shared radio frequency spectrum band; and transmitting a second communication over the shared radio frequency spectrum band, to the first base station, based at least in part on the determining. The second communication includes an approval of the downlink transmission or the uplink transmission.

公开(公告)号：US10231132B2

公开(公告)日：2019-03-12

申请号：US15650047

申请日：2017-07-14

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Siddhartha Mallik ,  Taesang Yoo ,  Juan Montojo ,  Aleksandar Damnjanovic ,  Junyi Li

IPC: H04W72/04 ,  H04W16/14 ,  H04L5/00 ,  H04L5/26 ,  H04W74/08 ,  H04L27/26 ,  H04W56/00 ,  H04W74/00

Abstract: Wireless communications systems and methods related to reservation signal transmission and detection for spectrum sharing are provided. A first wireless communication device communicates, with a second wireless communication device, a reservation request (RRQ) signal to reserve a transmission opportunity (TXOP) in a shared spectrum, wherein the shared spectrum is shared by a plurality of network operating entities, and wherein the first wireless communication device and the second wireless communication device are associated with a first network operating entity of the plurality of network operating entities. The first wireless communication device transmits a reservation response (RRS) signal indicating an interference tolerance level of the first wireless communication device.

公开(公告)号：US20190014507A1

公开(公告)日：2019-01-10

申请号：US15960883

申请日：2018-04-24

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Bin Tian ,  Jing Sun ,  Taesang Yoo ,  Aleksandar Damnjanovic ,  Tamer Kadous ,  Yongbin Wei ,  Hemanth Sampath ,  Sameer Vermani

IPC: H04W28/26 ,  H04W16/14

Abstract: Wireless communications systems and methods related to signaling medium reservation information medium sharing among multiple radio technologies (RATs) are provided. A first wireless communication device communicates, with a second wireless communication device, a reservation signal to reserve a transmission opportunity (TXOP) in a spectrum. The spectrum is shared by multiple RATs. The reservation signal includes a plurality of first waveform sequences indicating medium reservation information detectable by the multiple RATs. The first wireless communication device and the second wireless communication device are associated with a first RAT of the multiple RATs. The first wireless communication device communicates, with the second wireless communication device using the first RAT, a communication signal in the spectrum during the TXOP.

公开(公告)号：US20180375545A1

公开(公告)日：2018-12-27

申请号：US15975480

申请日：2018-05-09

Applicant: QUALCOMM Incorporated

Inventor： Zhifei Fan ,  Taesang Yoo

IPC: H04B1/7075 ,  H04L7/06 ,  H04L27/26

Abstract: Over-the-air phase synchronization for reciprocity-based coordinated multipoint (CoMP) joint transmission is discussed. The base stations of the CoMP group and served user equipment (UEs) transmit phase synchronization reference signals (PSRS). The receiving nodes compute wideband co-phasing values representing the phase difference between pairs of the PSRS over each tone of a whole spectrum band, and slope values based on the per-tone co-phasing values. The UEs feedback the wideband downlink co-phasing value and the downlink slope value. The base stations of the CoMP group determine a phase compensation based on the differences between the slope value calculated by the base station and the slope value reported by the UE, and based on the differences between the wideband co-phasing value calculated by the base station and the wideband co-phasing value reported by the UE. The base station uses the phase compensation to adjust communications by the base stations in the CoMP group.

公开(公告)号：US20180359780A1

公开(公告)日：2018-12-13

申请号：US15976301

申请日：2018-05-10

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Taesang Yoo ,  Seyed Ali Akbar Fakoorian ,  Zhifei Fan

IPC: H04W74/08 ,  H04B7/0417 ,  H04B7/04

CPC classification number: H04W74/085 ,  H04B7/0417 ,  H04B7/0478 ,  H04B7/0697 ,  H04W72/10

Abstract: Consideration of contention windows with spatial listen before talk (LBT) operations is discussed. In multiple input, multiple output (MIMO) transmission operations over a shared transmission medium, use of spatial LBT transmissions may be implemented with fairness options and parameters influenced by a condition of the MIMO transmitter, such conditions as the level of MIMO capability or the enablement of polite spatial LBT nulling transmissions. When a MIMO transmitter identifies data for transmission, it may determine a configuration of the medium access contention operation, synchronous or asynchronous content, based on the condition of the MIMO transmitter. The MIMO transmitter may then transmit the data either using spatial LBT transmission or not according to the configuration of the medium access contention operation.

公开(公告)号：US20180343588A1

公开(公告)日：2018-11-29

申请号：US15985048

申请日：2018-05-21

Applicant: QUALCOMM Incorporated

Inventor： Ahmed Kamel Sadek ,  Yisheng Xue ,  Siddhartha Mallik ,  Tamer Kadous ,  Xiaoxia Zhang ,  Taesang Yoo ,  Michael Mingxi Fan ,  Aleksandar Damnjanovic ,  Yongbin Wei ,  Jing Sun

IPC: H04W28/26 ,  H04L5/00 ,  H04W52/24 ,  H04B7/06

CPC classification number: H04W28/26 ,  H04B7/0626 ,  H04B7/063 ,  H04B17/336 ,  H04L5/0035 ,  H04L5/0048 ,  H04L5/0051 ,  H04L5/006 ,  H04L5/14 ,  H04L27/0014 ,  H04W16/14 ,  H04W52/241 ,  H04W74/0833 ,  H04W84/045

Abstract: A medium reservation framework is disclosed for coexistence of coordinated and uncoordinated wireless networks in licensed spectrum and shared spectrum. The proposed medium reservation framework organically takes into account operating regimes with different numbers of Tx/Rx antennas per node, provides flexibility in trading off medium contention aggressiveness and power saving, leverages the inherent synchronization nature of NR, and covers both coordinated and uncoordinated operation scenarios. Various aspects of the medium reservation framework may be centered on one or more combinations of some basic building blocks, such as an operation grid, synchronization signals, and reservation messages, such as a reservation request signal (RRQ) and one or more a reservation response signals (RRS).

公开(公告)号：US10129770B2

公开(公告)日：2018-11-13

申请号：US15453736

申请日：2017-03-08

Applicant: QUALCOMM Incorporated

Inventor： Taesang Yoo ,  Dinkar Vasudevan ,  Jing Sun ,  Juan Montojo

IPC: H04W24/02 ,  H04L1/00 ,  H04L5/00 ,  H04W72/04 ,  H04W72/14

Abstract: Methods, systems, and devices for broadcast transmissions in wireless communication are described. A base station may transmit a control reference signal (CRS), a UE-specific reference signal (UERS), and broadcast data (e.g., broadcast physical downlink shared channel (PDSCH) data) in a broadcast downlink transmission. A UE may identify that the CRS and UERS are associated with the broadcast downlink data, and demodulate the broadcast downlink data in the broadcast downlink transmission based at least in part on the CRS and UERS. A UE may estimate a frequency offset based on a phase difference between the CRS and UERS, combine the CRS and UERS for use in a channel estimation, and demodulate the broadcast data based at least in part on the estimated frequency offset and channel estimation. The base station may provide signaling, such as dynamic or semi-static signaling, that indicates presence of both CRS and UERS.

公开(公告)号：US10117207B2

公开(公告)日：2018-10-30

申请号：US15830821

申请日：2017-12-04

Applicant: QUALCOMM Incorporated

Inventor： Zhifei Fan ,  Taesang Yoo ,  Dinkar Vasudevan

IPC: H04B7/005 ,  H04B7/01 ,  H04B7/015 ,  H04B15/00 ,  H04W56/00 ,  H04B1/403 ,  H04B7/024 ,  H04L25/02 ,  H04L5/00

Abstract: Over-the-air (OTA) phase synchronization for reciprocity-based coordinated multipoint (CoMP) joint transmission is disclosed. Phase synchronization reference signals (PSRS) are transmitted within a CoMP operation that can be used to determine the phase drifts of the transmit and receive chains of the base stations. These phase drifts can then be used to obtain a relative phase drift between the uplink and downlink channels. When estimating the uplink channel from the sounding reference signals (SRS), the relative phase drift may be applied to estimate the downlink channel as well. The OTA phase synchronization may be performed with a user equipment (UE)-assisted or inter-base station procedures.