公开(公告)号：US10356764B2

公开(公告)日：2019-07-16

申请号：US15712584

申请日：2017-09-22

Applicant: QUALCOMM Incorporated

Inventor： Sony Akkarakaran ,  Tao Luo ,  Xiaoxia Zhang ,  Zhifei Fan ,  Juan Montojo

IPC: H04W72/04 ,  H04L5/00 ,  H04W72/12 ,  H04L1/00 ,  H04W76/27 ,  H04L1/16 ,  H04L1/18

Abstract: A method of wireless communication may include transmitting an uplink slot with a first control region, a second control region, and (e.g., optionally) a data region. Each region may include time resources and frequency resources. Transmitting the uplink slot may include transmitting the first control region in an earlier part of the uplink slot and transmitting the second control region (e.g., and the data region) in a later part of the uplink slot. The first control region may include time-critical control information and the second control region may include non-time-critical control information. A receiver receiving the uplink slot may receive the first control region before receiving the data region and the second control region.

公开(公告)号：US20190141723A1

公开(公告)日：2019-05-09

申请号：US16155515

申请日：2018-10-09

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Tamer Kadous ,  Yongbin Wei ,  Zhifei Fan ,  Jing Sun ,  Aleksandar Damnjanovic ,  Bin Tian

IPC: H04W72/12 ,  H04W72/04 ,  H04W16/14

Abstract: Wireless communications systems and methods related to signaling medium reservation information medium sharing among multiple radio technologies (RATs) are provided. A wireless communication device of a first RAT detects a channel reservation signal of a second RAT in a spectrum shared by the first RAT and the second RAT. The wireless communication device determines whether the channel reservation signal indicates a first transmission opportunity (TXOP) duration or a second TXOP duration that is different from the first TXOP duration. The wireless communication device selects, based on the determination, at least one of performing a backoff or continuing to monitor the spectrum.

公开(公告)号：US10187864B2

公开(公告)日：2019-01-22

申请号：US15474883

申请日：2017-03-30

Applicant: QUALCOMM Incorporated

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

IPC: H04W4/00 ,  H04W56/00 ,  H04L5/00 ,  H04L5/14 ,  H04W72/04 ,  H04W72/12 ,  H04W74/00

Abstract: Methods, systems, and devices for wireless communication are described. A base station may establish a transmission gap between downlink (DL) and uplink (UL) transmissions on a shared radio frequency (RF) spectrum band using time division duplex (TDD). A length of the gap may be based at least in part on a maximum allowed length of a filler signal corresponding to a coverage area of the base station. To reserve the shared band, a user equipment (UE) may communicate the filler signal for a length of time that is based at least in part on the maximum allowed length and a geographic distance between the UE and the base station. UEs farther from the base station transmit the filler signal of shorter lengths before sending an UL transmission, so that the UL transmissions from different UEs arrive at the same time at the base station regardless of the geographic distance between the UEs.

公开(公告)号：US20180167903A1

公开(公告)日：2018-06-14

申请号：US15830821

申请日：2017-12-04

Applicant: QUALCOMM Incorporated

Inventor： Zhifei Fan ,  Taesang Yoo ,  Dinkar Vasudevan

IPC: H04W56/00 ,  H04B7/024 ,  H04B1/403

CPC classification number: H04W56/0035 ,  H04B1/403 ,  H04B7/024 ,  H04L5/0035 ,  H04L25/0202 ,  H04W56/0015

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：US20180146506A1

公开(公告)日：2018-05-24

申请号：US15637457

申请日：2017-06-29

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Juan Montejo ,  Taesang Yoo ,  Zhifei Fan

IPC: H04W84/18 ,  H04W4/18 ,  H04W8/00 ,  H04M11/06 ,  H04W76/02

Abstract: Phase compensation in a new radio (NR) shared spectrum (NR-SS) coordinated multipoint (CoMP) environment is discussed. A base station may synchronize the phase between one or more additional base stations in a coordinated multipoint (CoMP) group serving one or more user equipments (UEs). This first synchronizing is performed prior to a current transmission opportunity between the CoMP group and the UEs. During transmission, a UE will sent a phase compensation reference signal (PCRS) to help with adjusting a phase drift that exceeds a predetermined threshold. The PCRS may be triggered by a signal from the base station or may be sent routinely by the UE. The UEs will transmit PCRS after each subframe, which the base stations use to adjust the phase.

公开(公告)号：US20180139785A1

公开(公告)日：2018-05-17

申请号：US15813811

申请日：2017-11-15

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Tao Luo ,  Taesang Yoo ,  Juan Montojo ,  Zhifei Fan

IPC: H04W74/08 ,  H04W72/04 ,  H04L5/00

Abstract: Systems and methods herein determine whether an uplink RACH request and/or an uplink autonomous message will be sent using Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM), Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM), or another waveform. The determinations may be based on carrier frequencies, path loss measurements, preconfigurations, and/or more. Further, the systems and methods may send the uplink using time and/or frequency resources that correspond to the DFT-S-OFMD waveform, CP-OFDM waveform, or other waveform. Other aspects, embodiments, and features are also claimed and described.

公开(公告)号：US20180054848A1

公开(公告)日：2018-02-22

申请号：US15240040

申请日：2016-08-18

Applicant: QUALCOMM Incorporated

Inventor： Taesang Yoo ,  Zhifei Fan ,  Jing Sun ,  Juan Montojo ,  Siddhartha Mallik ,  Aleksandar Damnjanovic ,  Xiaoxia Zhang

IPC: H04W76/04 ,  H04W16/14 ,  H04W72/04 ,  H04W28/26 ,  H04L5/00

CPC classification number: H04W76/25 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/0073 ,  H04W16/14 ,  H04W28/26 ,  H04W72/0413 ,  H04W72/0446 ,  H04W72/0453 ,  H04W72/14 ,  H04W74/02

Abstract: Techniques are described for wireless communication. One method includes receiving, in a downlink portion of a transmission structure on a shared radio frequency spectrum band, an uplink grant for an uplink data portion of the transmission structure. The transmission structure includes the downlink portion, followed by and time domain multiplexed with an uplink control portion, followed by and time domain multiplexed with the uplink data portion. The method also includes retaining access to the shared radio frequency spectrum band by transmitting an unscheduled transmission during the uplink control portion of the transmission structure.

公开(公告)号：US09374175B2

公开(公告)日：2016-06-21

申请号：US14300058

申请日：2014-06-09

Applicant: QUALCOMM Incorporated

Inventor： James Edward Beckman ,  Yuanning Yu ,  Zhifei Fan ,  Tao Luo

IPC: H04B15/00 ,  H04W72/04 ,  H04B7/04 ,  H04B7/02 ,  H04L1/06 ,  H04L25/03 ,  H04W24/02

CPC classification number: H04B15/00 ,  H04B7/02 ,  H04B7/0413 ,  H04L1/06 ,  H04L25/03 ,  H04W24/02 ,  H04W72/0453

Abstract: Certain aspects of the present disclosure relate to methods and apparatus that may be used to perform joint spatial processing for space frequency block coding and/or non-space frequency block coding channels in a wireless communications system. In aspects, apparatus and methods are provided for wireless communications, comprising receiving a signal from a serving cell and zero or more interfering cells, and processing the received signal, wherein the processing includes joint processing of at least two Resource Elements (REs), selected to conform to a Space Frequency Block Coding (SFBC) scheme in which transmitted data is modulated across two REs, to detect an interfering cell signal and canceling of the detected interfering cell signal from the received signal.

Abstract translation: 本公开的某些方面涉及可用于对无线通信系统中的空间频率块编码和/或非空间频率块编码信道执行联合空间处理的方法和装置。 在各方面中，为无线通信提供装置和方法，包括从服务小区和零个或多个干扰小区接收信号，以及处理所接收的信号，其中所述处理包括至少两个资源元素（RE）的联合处理 以符合在两个RE中调制发送数据的空间频率块编码（SFBC）方案，以检测干扰小区信号并从接收到的信号中取消检测到的干扰小区信号。

公开(公告)号：US09319151B2

公开(公告)日：2016-04-19

申请号：US13782649

申请日：2013-03-01

Applicant: QUALCOMM Incorporated

Inventor： Zhifei Fan ,  Hao Xu

IPC: H04B15/00 ,  H04B1/7105 ,  H04L25/03 ,  H04W72/04

CPC classification number: H04B15/00 ,  H04B1/7105 ,  H04B2201/70702 ,  H04L25/0328 ,  H04W72/0406

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided in which one or more semi-static parameters associated with at least one neighboring eNode B (eNB) and an interfering user equipment (UE) are detected, at an eNB, and a blind interference reduction scheme based on the one or more detected semi-static parameters to reduce a signal from the interfering UE is applied.

公开(公告)号：US09210700B2

公开(公告)日：2015-12-08

申请号：US14489277

申请日：2014-09-17

Applicant: QUALCOMM Incorporated

Inventor： Zhifei Fan ,  Hao Xu ,  Xiaoxia Zhang

IPC: H04W72/04 ,  H04W72/12 ,  H04L5/00

CPC classification number: H04W72/0413 ,  H04L5/0053 ,  H04L5/0055 ,  H04L5/0057 ,  H04W72/1268

Abstract: Systems and methodologies are described that facilitate simultaneous transmission of control information in a single sub-frame. For instance, simultaneous transmission can maintain single carrier waveforms for a control channel even when a plurality of information types is scheduled in concurrently. Channel quality indicators, scheduling requests and acknowledgement messages can be jointly coded. In addition, reference symbols in a sub-frame can be modulated to indicate values associated with a scheduling request or an acknowledgement message. Moreover, in situations where channel quality indicators, scheduling requests and or acknowledgement messages are simultaneously scheduled, one or more can be dropped. Further, a single carrier constraint can be relaxed to enable simultaneous transmission of information in the sub-frame at different frequencies.

Abstract translation: 描述了便于在单个子帧中同时传输控制信息的系统和方法。 例如，即使当并行调度多个信息类型时，同时传输也可以保持用于控制信道的单载波波形。 信道质量指示符，调度请求和确认消息可以被联合编码。 此外，子帧中的参考符号可以被调制以指示与调度请求或确认消息相关联的值。 此外，在同时调度信道质量指示符，调度请求和确认消息的情况下，可以丢弃一个或多个。 此外，可以放宽单载波约束以使得能够以不同频率在子帧中同时传输信息。