公开(公告)号：US10178668B2

公开(公告)日：2019-01-08

申请号：US15461280

申请日：2017-03-16

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Wanshi Chen ,  Peter Gaal ,  Xiaoxia Zhang

IPC: H04W4/00 ,  H04W72/04 ,  H04L1/18 ,  H04L5/00 ,  H04W16/14 ,  H04W72/02

Abstract: In enhanced licensed assisted access (eLAA), providing several approaches to report the CSI measurement may be desirable to provide flexibility in CSI reporting, especially in aperiodic CSI reporting. Further, a difference in using a licensed carrier and an unlicensed carrier may be considered during communication. In addition, assigning different transmit power usage based on different transmission types may be desired. The apparatus may be a user equipment (UE). The apparatus may be a UE. The UE receives a grant for uplink communication. The UE determines a reporting subframe based on the grant. The UE determines whether to select, as a reference subframe, a triggering subframe in which the grant is received or a subframe before the reporting subframe. The UE transmits, in the reporting subframe, channel state information (CSI) measured in the reference subframe.

公开(公告)号：US20180368089A1

公开(公告)日：2018-12-20

申请号：US15989698

申请日：2018-05-25

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Arumugam Chendamarai Kannan ,  Chih-Hao Liu ,  Tamer Kadous

IPC: H04W56/00 ,  H04J11/00 ,  H04W16/14

Abstract: Methods, systems, and devices for wireless communication are described. A base station may identify a first synchronization sequence and generate a second synchronization sequence based at least in part on the first synchronization sequence. The base station may map the first synchronization sequence to a first resource block of a synchronization channel associated with a first frequency sub-band of a shared radio frequency spectrum band and the second synchronization sequence to a second resource block associated with a second frequency sub-band of the synchronization channel. The base station may then transmit the first synchronization sequence and the second synchronization sequence concurrently over the synchronization channel using the first resource block and the second resource block according to the mapping. In some cases, the second synchronization may be generated by applying a first phase shift to the first synchronization sequence.

公开(公告)号：US20180352563A1

公开(公告)日：2018-12-06

申请号：US15926032

申请日：2018-03-20

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

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

CPC classification number: H04L5/0044 ,  H04L5/0053 ,  H04L27/0006

Abstract: Methods, systems, and devices for wireless communication are described. A base station may transmit downlink control information to a user equipment (UE). The downlink control information may identify a grantless uplink group associated with one or more grantless uplink subframes for the UE. The UE may transmit uplink control information for the one or more grantless uplink subframes associated with the indicated uplink group of the UE. The UE may then transmit grantless uplink data during at least one of the one or more grantless uplink subframes based at least in part on the grantless uplink group associated for the UE and the uplink control information.

公开(公告)号：US10075270B2

公开(公告)日：2018-09-11

申请号：US14864056

申请日：2015-09-24

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Durga Prasad Malladi ,  Yongbin Wei

IPC: H04L5/00 ,  H04L1/18 ,  H04W72/04 ,  H04W24/08 ,  H04L27/00

CPC classification number: H04L5/0048 ,  H04L1/1822 ,  H04L5/001 ,  H04L5/0035 ,  H04L5/005 ,  H04L27/0006 ,  H04W24/08 ,  H04W72/042

Abstract: Techniques are described for wireless communication. A first method includes identifying a configuration of a downlink subframe in a shared radio frequency spectrum band, and generating, based at least in part on the configuration of the downlink subframe, a cell-specific reference signal (CRS) for the downlink subframe. A second method includes dynamically determining a presence of a CRS in a downlink subframe in a shared radio frequency spectrum band, and performing at least one operation during the downlink subframe in response to the dynamic determination.

公开(公告)号：US20180242328A1

公开(公告)日：2018-08-23

申请号：US15954497

申请日：2018-04-16

Applicant: QUALCOMM Incorporated

Inventor： Wanshi Chen ,  Aleksandar Damnjanovic ,  Srinivas Yerramalli ,  Tao Luo ,  Peter Gaal

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

Abstract: Uplink control channel management is disclosed for LTE/LTE-A communication systems with unlicensed spectrum in which two or more physical resource blocks (PRBs) are allocated for uplink control channel transmission. The uplink control information (UCI) payload may be determined based on clear channel assessment (CCA) information associated with carriers scheduled for transmission of the UCI data. With the UCI payload determined, two or more uplink control channel messages may be generated according to at least one control channel format, wherein uplink control channel messages include the UCI payload. These generated uplink control channel messages may then be transmitted over the allocated PRBs.

公开(公告)号：US20180227936A1

公开(公告)日：2018-08-09

申请号：US15887277

申请日：2018-02-02

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Ahmed Kamel Sadek ,  Tamer Kadous

IPC: H04W72/12 ,  H04W72/04 ,  H04L27/26

Abstract: Techniques for autonomous uplink (AUL) transmissions are provided that allow for efficient use of shared radio frequency spectrum band resources. A user equipment (UE) may determine a duration of an AUL transmission and modify an uplink waveform or provide an indication to a base station of one or more channel resources that may be available for base station transmissions, in order to more fully utilize shared radio frequency spectrum band resources within a maximum channel occupancy time (MCOT). A base station may activate or deactivate AUL transmissions through downlink control information (DCI) transmitted to the UE. A UE and base station may exchange various other control information to provide relatively efficient autonomous uplink transmissions and use of the shared radio frequency spectrum band resources.

公开(公告)号：US20180198556A1

公开(公告)日：2018-07-12

申请号：US15913739

申请日：2018-03-06

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Aleksandar Damnjanovic ,  Marco Papaleo ,  Rahul Malik ,  Peter Gaal

IPC: H04L1/00 ,  H04W74/08 ,  H04L1/18 ,  H04W16/14 ,  H04W88/06 ,  H04W72/12

CPC classification number: H04L1/0009 ,  H04L1/1812 ,  H04W16/14 ,  H04W72/1215 ,  H04W74/0808 ,  H04W88/06

Abstract: Techniques are described for wireless communication. A first method includes sensing an indication of first radio access technology (RAT) communications occupying a shared radio frequency spectrum band; and configuring, in response to the sensing, at least one parameter of a second RAT used by a device to contend for access to the band. A second method includes randomly selecting a number from a range of numbers extending between a lower bound and an upper bound; contending for access to a shared radio frequency spectrum band by performing an extended clear channel assessment (ECCA) procedure over a plurality of CCA slots, the plurality of CCA slots including a first number of CCA slots equal to the upper bound; and winning contention for access to the band after determining, while performing the ECCA procedure, that the band is available for a second number of CCA slots equal to the randomly selected number.

公开(公告)号：US20180160389A1

公开(公告)日：2018-06-07

申请号：US15826439

申请日：2017-11-29

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Hao Xu ,  Tamer Kadous

IPC: H04W64/00 ,  H04W74/08 ,  H04W24/10

CPC classification number: H04W64/00 ,  H04W16/14 ,  H04W24/10 ,  H04W74/0808 ,  H04W88/02 ,  H04W88/08

Abstract: Positioning techniques for wireless communications devices using shared radio frequency spectrum are provided that may enhance positioning determination for devices operating using shared radio frequency spectrum. Various disclosed techniques provide for identifying determining one or more parameters for a positioning procedure for a UE based on characteristics of shared radio frequency spectrum transmissions. Such parameters may include, for example, frequency information for positioning transmissions or frequency hopping patterns. In some cases, a base station may transmit multiple positioning transmissions that have different coverage levels. In some cases, a UE may transmit an uplink positioning signal that may be received by multiple base stations and used for UE position determination. In some cases, a UE may be configured to monitor for a positioning transmissions on a dedicated frequency, and report measurements associated with the positioning transmissions using a shared frequency.

公开(公告)号：US20180123859A1

公开(公告)日：2018-05-03

申请号：US15697212

申请日：2017-09-06

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Chirag Patel ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04L29/08

CPC classification number: H04L29/0854 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/0053 ,  H04L29/08018 ,  H04L29/08027 ,  H04L29/08423 ,  H04L67/1095 ,  H04L69/323 ,  H04L69/324 ,  H04W4/70 ,  H04W48/12

Abstract: This disclosure includes methods, systems, and devices for wireless communication. A repetition of symbols may be used to increase a device's ability to synchronize and communicate using unlicensed spectrum. For example, a base station may schedule a frame that includes repetitions, in time or frequency, of a control or data signal. After performing a listen-before-talk (LBT) procedure, the base station may broadcast or transmit the frame to one or more devices, such as a user equipment (UE). For instance, the frame may include repetitions of a discovery reference signal (DRS), and be broadcast by the base station to enable synchronization by the UE. In other examples, the signal may include repetitions of a cell-specific reference signal (CRS), and a UE may identify a start of a transmission opportunity using the CRSs. Other signals, such as downlink control and shared channels, may be repeated within a frame in a similar manner.

公开(公告)号：US20180115347A1

公开(公告)日：2018-04-26

申请号：US15791145

申请日：2017-10-23

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Arumugam Chendamarai Kannan ,  Chirag Sureshbhai Patel

IPC: H04B7/0404 ,  H04W74/00 ,  H04W72/04

CPC classification number: H04B7/0404 ,  H04B2201/698 ,  H04W16/14 ,  H04W72/0413 ,  H04W74/004 ,  H04W74/006 ,  H04W74/0808

Abstract: Techniques are described for wireless communication. One method includes receiving, from a network access device, an uplink grant to transmit over a channel of a shared radio frequency spectrum band. The uplink grant indicates a number of subframes and a transmission window having a duration of a plurality of subframes. The method further includes contending for access to the channel of the shared radio frequency spectrum band based at least in part on a listen before talk (LBT) procedure and in accordance with the uplink grant; and transmitting an uplink transmission over the channel of the shared radio frequency spectrum band, in accordance with the uplink grant/ A starting subframe of the uplink transmission is based at least in part on the LBT procedure and is within the transmission window.