公开(公告)号：US20190306878A1

公开(公告)日：2019-10-03

申请号：US16281828

申请日：2019-02-21

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Zhifei Fan ,  Kapil Bhattad ,  Jing Sun ,  Tamer Kadous ,  Srinivas Yerramalli

IPC: H04W72/14 ,  H04L1/18 ,  H04L5/00 ,  H04W72/12

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) and a base station may communicate in an unlicensed spectrum (e.g., a shared radio frequency spectrum band). As such, the UE may determine a codebook size for transmitting hybrid access request (HARQ) acknowledgement (ACK) feedback with respect to the unlicensed spectrum. Accordingly, the UE may base the HARQ ACK codebook size on a number of HARQ processes with which the UE has been configured. Additionally or alternatively, the UE may base the HARQ ACK codebook size on a number and/or duration of downlink channel monitoring occasions indicated by the base station. In some cases, the UE may base the HARQ ACK codebook size on a combination of the techniques described herein.

公开(公告)号：US10305537B2

公开(公告)日：2019-05-28

申请号：US15975480

申请日：2018-05-09

Applicant: QUALCOMM Incorporated

Inventor： Zhifei Fan ,  Taesang Yoo

IPC: H04L7/06 ,  H04B1/7075 ,  H04L27/26 ,  H04W56/00

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：US20190021116A1

公开(公告)日：2019-01-17

申请号：US15969625

申请日：2018-05-02

Applicant: QUALCOMM Incorporated

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

IPC: H04W74/08 ,  H04W16/14

Abstract: Methods, systems, and devices for wireless communication are described. A first wireless device may receive a clear to send signal based precoded based at least in part on a receive filter at a second wireless device. The first wireless device may calculate a transmit precoder based at least in part on the clear to send signal. For example, the first wireless device may calculate a whitening filter and a second filter based at least in part on the clear to send signal. The first wireless device may transmit a request to send signal precoded by the transmit precoder to initiate communications with a third wireless device without significantly interfering with ongoing communications at the second wireless device.

公开(公告)号：US20190021092A1

公开(公告)日：2019-01-17

申请号：US16031869

申请日：2018-07-10

Applicant: QUALCOMM Incorporated

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

IPC: H04W72/08 ,  H04L5/00 ,  H04B7/0456

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit a precoded reference signal to prevent interference with an incoming signal from a base station. The UE may determine a precoder for the reference signal based at least in part on a whitening matrix. In some examples, the UE may determine the precoder based at least in part on the whitening matrix and an effective channel between the base station and the UE. The precoded reference signal may be used by devices in other wireless communications systems to avoid interfering with a signal being received by the UE. In some examples, the UE may alternatively or additionally transmit an indication of the number of additional layers of the link between the UE and the base station that may be nulled out for a second link.

公开(公告)号：US20180376505A1

公开(公告)日：2018-12-27

申请号：US15948390

申请日：2018-04-09

Applicant: QUALCOMM Incorporated

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

IPC: H04W74/08 ,  H04W4/06

Abstract: Spatial listen before talk (LBT) with broadcasting or multicasting reception is disclosed. Aspects of the disclosure provide for managing spatial LBT transmissions between broadcast communication nodes and neighboring cells. In one aspect, the broadcast transmitter transmits a preamble that identifies the broadcast transmission durations and the non-broadcast durations in the upcoming transmit opportunity. The potential interferer would read the preamble and yield any transmissions during the broadcast durations. Additional aspects provide for a periodic broadcast clear-to-send (CTS) signal transmitted by the broadcast receivers. The interferer may use the broadcast CTS to perform spatial LBT during the broadcast durations. Further aspects allow the broadcast receivers to determine when potential interferers would cause interference above a threshold. In such circumstances, the broadcast receivers would send the CTS to allow the interferer to perform spatial LBT during the broadcast durations.

公开(公告)号：US20180302866A1

公开(公告)日：2018-10-18

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 ,  H04W24/10 ,  H04L25/02

CPC classification number: H04W56/001 ,  H04L5/0023 ,  H04L5/0035 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/0051 ,  H04L5/0053 ,  H04L25/0202 ,  H04L25/0228 ,  H04L25/03343 ,  H04W24/10 ,  H04W56/00 ,  H04W88/08

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：US20170310426A1

公开(公告)日：2017-10-26

申请号：US15485656

申请日：2017-04-12

Applicant: QUALCOMM Incorporated

Inventor： Zhifei Fan ,  Xiaoxia Zhang ,  Taesang Yoo ,  Jing Sun ,  Juan Montojo

IPC: H04L1/18 ,  H04L1/00 ,  H04W72/12 ,  H04W74/08

CPC classification number: H04L1/1812 ,  H04L1/0013 ,  H04L1/1664 ,  H04L1/1861 ,  H04L1/1893 ,  H04L5/001 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0055 ,  H04L5/0094 ,  H04L5/14 ,  H04W72/1289 ,  H04W74/0808

Abstract: A base station may provide both an uplink grant and a downlink grant in a same transmission time interval (TTI), and may provide an indication in the uplink grant that the TTI includes the downlink grant. A user equipment (UE) that receives the uplink grant may provide feedback using identified feedback resources in an uplink shared channel, and other uplink transmissions may be rate matched around the feedback resources in the uplink shared channel. A base station receiving the feedback may monitor the feedback resources to determine whether the downlink grant or one or more of the downlink transmissions were successfully received at the UE. A base station, in some examples, may monitor different sets of resources to determine whether certain of the uplink grant, downlink grant, downlink transmissions associated with the downlink grant, or any combinations thereof, have been successfully received at the UE.

公开(公告)号：US12245228B2

公开(公告)日：2025-03-04

申请号：US17545334

申请日：2021-12-08

Applicant: QUALCOMM Incorporated

Inventor： Qingjiang Tian ,  Mostafa Khoshnevisan ,  Jing Sun ,  Xiaoxia Zhang ,  Ahmed Abdelaziz Ibrahim Abdelaziz Zewail ,  Zhifei Fan ,  Tao Luo

IPC: H04W72/1273 ,  H04W72/0446 ,  H04W72/23 ,  H04W76/30

Abstract: Methods, systems, and devices for wireless communications are described. A wireless device such as a user equipment (UE) may receive, from a scheduling device such as a base station, control signaling which indicates a semi-persistent scheduling (SPS) configuration scheduling a burst of multiple downlink shared channel transmission opportunities during an SPS interval. Based on receiving the SPS configuration, the UE may receive downlink signaling from the base station in a downlink shared channel transmission opportunity of the SPS interval. In some other aspects, a UE may receive control signaling which indicates a configured grant (CG) that schedules a burst of multiple uplink shared channel transmission opportunities during a CG timing interval. Based on receiving the CG, the UE may transmit uplink signaling to the base station in an uplink shared channel transmission opportunity indicated by the CG.

公开(公告)号：US12212445B2

公开(公告)日：2025-01-28

申请号：US17859369

申请日：2022-07-07

Applicant: QUALCOMM Incorporated

Inventor： Raviteja Patchava ,  Xiaoxia Zhang ,  Zhifei Fan ,  Jing Sun ,  Tao Luo ,  Junyi Li ,  Morteza Soltani

IPC: H04L27/26 ,  H04L5/00 ,  H04W72/12 ,  H04W72/1263

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive first control signaling identifying a demodulation reference signal (DMRS) pattern that may be uniformly distributed in a time domain and a frequency domain. The DMRS pattern may include a first set of resource elements for the DMRS, a second set of resource elements for guard tones adjacent to and greater in frequency than the first set of resource elements, and a third set of resource elements for guard tones adjacent to and lower in frequency than the first set of resource elements. The UE may receive second control signaling that schedules a data signal to be communicated between the UE and a network node in a set of time-frequency resources. The UE may communicate the data signal according to the second control signaling and the DMRS according to the DMRS pattern.

公开(公告)号：US12184570B2

公开(公告)日：2024-12-31

申请号：US17446916

申请日：2021-09-03

Applicant: QUALCOMM Incorporated

Inventor： Ahmed Abdelaziz Ibrahim Abdelaziz Zewail ,  Zhifei Fan ,  Xiaoxia Zhang ,  Tao Luo ,  Jing Sun ,  Wooseok Nam

IPC: H04L5/00 ,  H04L25/02

Abstract: Aspects of the present disclosure can be implemented in a method for wireless communication by a first wireless node. The method generally includes receiving, from a second wireless node, information regarding PTRS tones, designating one or more of the PTRS tones as ZP tones and one or more of the PTRS tones as NZP tones based, at least in part, on the information, and transmitting a PTRS on the NZP tones. In some cases, the first wireless node is a user equipment (UE) and the second wireless node is a network entity. In some cases, the first wireless node is a network entity and the second wireless node is a UE.