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：US20190159193A1

公开(公告)日：2019-05-23

申请号：US16191257

申请日：2018-11-14

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Seyed Ali Akbar Fakoorian ,  Zhifei Fan ,  Jing Sun

IPC: H04W72/04 ,  H04L5/00 ,  H04B1/713

Abstract: Wireless communications systems and methods related to multiplexing uplink control channel signals from different users are provided. A first wireless communication device obtains an uplink control channel multiplex configuration indicating a first frequency spreading sequence and at least one of a second frequency spreading sequence or a first spatial direction. The first wireless communication device communicates, with a second wireless communication device, a first uplink control channel signal including a first reference signal and a first uplink control information signal in a frequency spectrum based on the uplink control channel multiplex configuration. The first reference signal is based on the first frequency spreading sequence and the first uplink control information signal is based on at least one of the second frequency spreading sequence or the first spatial direction.

公开(公告)号：US20190090161A1

公开(公告)日：2019-03-21

申请号：US16125258

申请日：2018-09-07

Applicant: QUALCOMM Incorporated

Inventor： Zhifei Fan ,  Xiaoxia Zhang ,  Jing Sun ,  Aleksandar Damnjanovic

IPC: H04W28/26 ,  H04W72/04

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for transmitting channel reservation signals. In one example, a device used a gating interval to gain access to a channel of a shared spectrum, performs a clear channel assessment to determine if the channel is available, selects a channel reservation signal from among a plurality of predetermined said channel reservation signals if the channel is clear, and transmits the channel reservation signal upon the channel being clear. The channel reservation signal comprises a preamble, and a message, wherein the CR preamble and the CR message use a common numerology understood by at least one of different radio access technologies, and different numerologies in the same radio access technology, and the radio access technologies comprise WIFI and NR-SS.

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：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.

公开(公告)号：US09590878B2

公开(公告)日：2017-03-07

申请号：US14133062

申请日：2013-12-18

Applicant: QUALCOMM Incorporated

Inventor： Hao Xu ,  Tingfang Ji ,  Peter Gaal ,  Wanshi Chen ,  Zhifei Fan ,  Yongbin Wei

IPC: H04W24/08 ,  H04L12/26 ,  H04L1/00

CPC classification number: H04L1/0009 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/0027 ,  H04L1/0032 ,  H04L43/06 ,  H04W24/08 ,  H04W72/0413 ,  H04W76/30

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The UE determines CSI. The UE determines whether to send the CSI based on at least one of a timer or a threshold. The UE sends the CSI upon determining to send the CSI. The UE may send the CSI in a MAC header upon determining to send the CSI. When the UE determines whether to send the CSI based on the threshold, the UE may determine whether to send the CSI based on a difference between the CSI and reference CSI. The UE may determine the reference CSI based on at least one of previously reported CSI, fixed CSI, or an MCS of a received data transmission from a base station. The UE may send CSI to the base station in an initial connection setup with the base station.

Abstract translation: 提供了一种用于无线通信的方法，装置和计算机程序产品。 该装置可以是UE。 UE确定CSI。 UE基于定时器或阈值中的至少一个确定是否发送CSI。 确定发送CSI后，UE发送CSI。 在确定发送CSI之后，UE可以在MAC报头中发送CSI。 当UE基于阈值确定是否发送CSI时，UE可以基于CSI和参考CSI之间的差异来确定是否发送CSI。 UE可以基于先前报告的CSI，固定CSI或来自基站的接收数据传输的MCS中的至少一个来确定参考CSI。 UE可以在与基站的初始连接建立中向基站发送CSI。

公开(公告)号：US20160344526A1

公开(公告)日：2016-11-24

申请号：US15153419

申请日：2016-05-12

Applicant: QUALCOMM Incorporated

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

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

CPC classification number: H04L5/0048 ,  H04L5/0051 ,  H04L5/0091 ,  H04W72/0413 ,  H04W72/042 ,  H04W72/0446 ,  H04W72/14

Abstract: A network may use enhanced sounding reference signal (SRS) transmission techniques to support reference signal transmissions over shared spectrum. For example, a wireless device may receive an uplink grant and an indicator. The uplink grant may include an uplink resource allocation to the wireless device and the indicator may alert the device of a forthcoming reference signal transmission. The wireless device may use the uplink grant and the indicator to determine a reference signal transmission period relative to the resources assigned in the uplink grant. For example, the wireless device may determine that the reference signal transmission period is prior to, during, or subsequent to the uplink transmission period. In some cases, a wireless device may be aperiodically or periodically scheduled for reference signal transmissions.

Abstract translation: 网络可以使用增强的探测参考信号（SRS）传输技术来支持共享频谱上的参考信号传输。 例如，无线设备可以接收上行链路许可和指示符。 上行链路许可可以包括向无线设备的上行链路资源分配，并且指示符可以向设备通知即将到来的参考信号传输。 无线设备可以使用上行链路许可和指示符来确定相对于在上行链路许可中分配的资源的参考信号传输周期。 例如，无线设备可以确定参考信号传输周期在上行链路传输周期之前，期间或之后。 在一些情况下，无线设备可以非周期性地或周期性地调度用于参考信号传输。

公开(公告)号：US20140198677A1

公开(公告)日：2014-07-17

申请号：US14133062

申请日：2013-12-18

Applicant: QUALCOMM Incorporated

Inventor： Hao Xu ,  Tingfang Ji ,  Peter Gaal ,  Wanshi Chen ,  Zhifei Fan ,  Yongbin Wei

IPC: H04L12/26 ,  H04W24/08

CPC classification number: H04L1/0009 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/0027 ,  H04L1/0032 ,  H04L43/06 ,  H04W24/08 ,  H04W72/0413 ,  H04W76/30

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The UE determines CSI. The UE determines whether to send the CSI based on at least one of a timer or a threshold. The UE sends the CSI upon determining to send the CSI. The UE may send the CSI in a MAC header upon determining to send the CSI. When the UE determines whether to send the CSI based on the threshold, the UE may determine whether to send the CSI based on a difference between the CSI and reference CSI. The UE may determine the reference CSI based on at least one of previously reported CSI, fixed CSI, or an MCS of a received data transmission from a base station. The UE may send CSI to the base station in an initial connection setup with the base station.

Abstract translation: 提供了一种用于无线通信的方法，装置和计算机程序产品。 该装置可以是UE。 UE确定CSI。 UE基于定时器或阈值中的至少一个确定是否发送CSI。 确定发送CSI后，UE发送CSI。 在确定发送CSI之后，UE可以在MAC报头中发送CSI。 当UE基于阈值确定是否发送CSI时，UE可以基于CSI和参考CSI之间的差异来确定是否发送CSI。 UE可以基于先前报告的CSI，固定CSI或来自基站的接收数据传输的MCS中的至少一个来确定参考CSI。 UE可以在与基站的初始连接建立中向基站发送CSI。

公开(公告)号：US20130114450A1

公开(公告)日：2013-05-09

申请号：US13664865

申请日：2012-10-31

Applicant: QUALCOMM Incorporated

Inventor： Hao Xu ,  Peter Gaal ,  Zhifei Fan ,  Yongbin Wei

IPC: H04W72/08

CPC classification number: H04W72/0426

Abstract: Certain aspects of the present disclosure provide methods, apparatus, and computer-program products for the detection of potentially interfering or interfering user equipment (UE) in the proximity of a detecting entity. The detecting entity may be a base station or a UE. In an aspect, the proposed detecting scheme utilizes semi-static system information from one or more neighboring base stations (BSs), and identifies a neighbor BS's UE that causes interference in the physical uplink control channel (PUCCH). The proposed detecting scheme may also identify corresponding resources that are allocated to an interfering UE by the interfering neighbor base station. In aspects, detecting schemes may not utilize information from one or more neighboring BSs.

Abstract translation: 本公开的某些方面提供用于检测在检测实体附近的潜在干扰或干扰用户设备（UE）的方法，装置和计算机程序产品。 检测实体可以是基站或UE。 在一方面，所提出的检测方案利用来自一个或多个相邻基站（BS）的半静态系统信息，并且识别在物理上行链路控制信道（PUCCH）中引起干扰的邻居BS的UE。 所提出的检测方案还可以识别由干扰相邻基站分配给干扰UE的相应资源。 在方面中，检测方案可能不利用来自一个或多个相邻BS的信息。