公开(公告)号：US20180269962A1

公开(公告)日：2018-09-20

申请号：US15919127

申请日：2018-03-12

Applicant: QUALCOMM Incorporated

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

IPC: H04B7/26 ,  H01Q1/24 ,  H04B7/0491 ,  H04W16/14 ,  H04W72/08 ,  H04W16/24 ,  H04W8/00 ,  H04W88/04

CPC classification number: H04B7/2606 ,  H01Q1/246 ,  H04B7/0491 ,  H04B7/0689 ,  H04W4/70 ,  H04W8/005 ,  H04W16/14 ,  H04W16/24 ,  H04W36/06 ,  H04W36/305 ,  H04W48/18 ,  H04W72/082 ,  H04W74/08 ,  H04W88/04 ,  H04W88/06

Abstract: Described techniques provide for switching a user equipment (UE) between different coverage enhancement (CE) modes, such as between a non-CE mode and a CE mode. A UE may determine that a CE mode switch is to be performed and may initiate the mode switching. The UE may compare signal qualities of signals from one or more base stations against one or more threshold values and determine that a switch from a CE mode to a non-CE mode, or from a non-CE to CE mode, is to be performed. In some cases, a UE may be in idle mode and switch between CE modes, or may perform a cell reselection to a different base station. In other cases, a UE may be in connected mode and may declare a radio link failure to initiate a mode switch. A base station may initiate mode switching based on radio link monitoring of UEs.

公开(公告)号：US20180227011A1

公开(公告)日：2018-08-09

申请号：US15884161

申请日：2018-01-30

Applicant: QUALCOMM Incorporated

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

IPC: H04B1/7156 ,  H04B1/7083 ,  H04B1/7087 ,  H04B1/7143

Abstract: Described techniques provide for transmission of synchronization signals using frequency hopping across a number of hopping frequencies in unlicensed or shared radio frequency spectrum. A base station may identify a set of hop frequencies for transmitting synchronization signals, and transmit synchronization signals using a hopping pattern over the hop frequencies. A user equipment (UE) seeking to identify the base station may monitor one or more of the hop frequencies to identify one or more synchronization signals on the hop frequency. A system timing may be identified in some cases, and one or more base station IDs may be identified. In some cases, a hop frequency may be monitored for a duration that may span the transmission of two or more synchronization signals of a particular base station, based on a periodicity of synchronization signal transmissions on each hop frequency.

公开(公告)号：US20180176904A1

公开(公告)日：2018-06-21

申请号：US15894514

申请日：2018-02-12

Applicant: QUALCOMM Incorporated

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

IPC: H04W72/04 ,  H04L5/00 ,  H04J13/00 ,  H04W76/27 ,  H04W28/06 ,  H04L5/14 ,  H04W72/12

Abstract: A first method for wireless communications may comprise determining sizes of payloads of user equipments (UEs), determining whether to multiplex the payloads of the UEs based on the sizes of the payloads, and allocating codes or cyclic shifts to the UEs to transmit the payloads on a single interlace of resources. A second method for wireless communications may comprise determining a first code or a first cyclic shift used for a first transmission using an interlace of resources, and allocating second codes or second cyclic shifts to UEs for a second transmission, where the second transmission may be multiplexed with the first transmission on the interlace of resources. A third method for wireless communications may comprise allocating a first interlace of resources for a first transmission for occupying an unlicensed radio frequency spectrum band, and allocating a second interlace of resources, occupied by a base station, for a second transmission.

公开(公告)号：US20180132235A1

公开(公告)日：2018-05-10

申请号：US15460215

申请日：2017-03-15

Applicant: QUALCOMM Incorporated

Inventor： Seyedkianoush Hosseini ,  Srinivas Yerramalli ,  Wanshi Chen ,  Jing Sun ,  Hao Xu ,  Shimman Arvind Patel

IPC: H04W72/04 ,  H04W8/22 ,  H04L5/00 ,  H04W74/08 ,  H04W16/14 ,  H04W24/10

CPC classification number: H04W72/0446 ,  H04L1/1861 ,  H04L5/001 ,  H04L5/005 ,  H04L5/0051 ,  H04L5/0057 ,  H04L5/0064 ,  H04L5/0091 ,  H04L5/0092 ,  H04L5/14 ,  H04L27/0006 ,  H04L27/2602 ,  H04W8/22 ,  H04W16/14 ,  H04W24/10 ,  H04W72/042 ,  H04W72/1289 ,  H04W74/0808

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit uplink (UL) messages in unlicensed spectrum with a reduced UL timing delay. The UL timing delay may be reduced by using a shortened transmission time interval (TTI) (e.g., a TTI that is reduced in duration relative to other TTIs in the system or in a legacy system) or by reducing the number of TTIs between a grant and the corresponding UL message. The reduced UL timing delay may decrease the likelihood that the UE will wait for a subsequent transmit opportunity (TxOp) to transmit the UL message. In some cases, the reduced UL timing delay corresponds to a reduced hybrid automatic repeat request (HARM) processing delay. In some cases, a time difference (e.g., measured in TTIs) between a measurement reference TTI a corresponding channel state information (CSI) report may also be reduced.

公开(公告)号：US09912438B2

公开(公告)日：2018-03-06

申请号：US15019767

申请日：2016-02-09

Applicant: QUALCOMM Incorporated

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

IPC: H04L1/00 ,  H04W74/08 ,  H04W16/14 ,  H04W88/06 ,  H04L1/18 ,  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：US20180048412A1

公开(公告)日：2018-02-15

申请号：US15790781

申请日：2017-10-23

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Vikas Jain ,  Srinivas Yerramalli ,  Tao Luo ,  Aleksandar Damnjanovic ,  Kiran Kumar Somasundaram

IPC: H04J11/00 ,  H04W74/08 ,  H04W16/14 ,  H04W72/12

CPC classification number: H04J11/0056 ,  H04W16/14 ,  H04W72/1268 ,  H04W74/0808

Abstract: Mitigation of inter-base station resynchronization loss in wireless networks including contention-based shared frequency spectrum is discussed. Aspects of such mitigation provide for base stations entering into an idle mode when a transmission opportunity occurs in a radio frame of the next resynchronization occasion. Additional aspects provide for the base station to signal a flexible listen before talk (LBT) frame length to the user equipment (UE), either with or without explicit signaling of the downlink-uplink division. Further aspects provide for the base station to signal a reset indication to UEs that will prompt the UEs to monitor for downlink channel reserving signals prior to the current LBT frame ending by the resynchronization occasion.

公开(公告)号：US20180027582A1

公开(公告)日：2018-01-25

申请号：US15608858

申请日：2017-05-30

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Peter Gaal ,  Juan Montojo ,  Tao Luo ,  Wanshi Chen

IPC: H04W72/12 ,  H04W72/04 ,  H04L5/00 ,  H04L1/00 ,  H04W52/02 ,  H04L1/18 ,  H04W56/00 ,  H04W52/14 ,  H04W52/36 ,  H04W16/14 ,  H04W74/08

CPC classification number: H04W72/0446 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0013 ,  H04L1/004 ,  H04L1/18 ,  H04L1/1825 ,  H04L1/1861 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/0051 ,  H04L5/0053 ,  H04L5/0055 ,  H04Q2213/13215 ,  H04W16/14 ,  H04W28/0278 ,  H04W52/0216 ,  H04W52/146 ,  H04W52/367 ,  H04W56/0005 ,  H04W68/005 ,  H04W72/0413 ,  H04W72/042 ,  H04W72/1226 ,  H04W72/1268 ,  H04W72/1284 ,  H04W72/1289 ,  H04W72/14 ,  H04W74/006 ,  H04W74/085 ,  Y02D70/00 ,  Y02D70/10 ,  Y02D70/12 ,  Y02D70/1242 ,  Y02D70/126 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/146

Abstract: Techniques are described for wireless communication. One method includes detecting a first reference signal received from a user equipment (UE) in a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) received over a shared radio frequency spectrum band; identifying a reference TTI in which the first reference signal is received; determining a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band; and transmitting an indication of the determined contention window size to the UE.

公开(公告)号：US20180014301A1

公开(公告)日：2018-01-11

申请号：US15642104

申请日：2017-07-05

Applicant: QUALCOMM Incorporated

Inventor： Wanshi Chen ,  Seyedkianoush Hosseini ,  Peter Gaal ,  Srinivas Yerramalli ,  Hao Xu ,  Jing Sun ,  Shimman Arvind Patel ,  Aamod Khandekar

IPC: H04W72/04 ,  H04L5/00 ,  H04W76/04 ,  H04L1/18 ,  H04W88/02

CPC classification number: H04W72/0446 ,  H04L1/1812 ,  H04L1/1861 ,  H04L5/00 ,  H04L5/0048 ,  H04W72/0413 ,  H04W72/042 ,  H04W76/27 ,  H04W88/02

Abstract: Methods, systems, and devices for wireless communication are described that provide for reduced timing between certain downlink communications and responsive uplink communications relative to certain legacy systems (e.g., legacy LTE systems). A user equipment (UE) or base station may be capable of operating using two or more timing configurations that each include an associated time period between receipt of a downlink communication (e.g., a grant of uplink resources or shared channel data) and a responsive uplink communication (e.g., an uplink transmission using the granted uplink resources or feedback of successful reception of the shared channel data). In cases where a UE or base station are capable of two or more timing configurations, a timing configuration for a transmission may be determined and the responsive uplink communication transmitted according to the determined timing configuration.

公开(公告)号：US09867187B2

公开(公告)日：2018-01-09

申请号：US14807024

申请日：2015-07-23

Applicant: QUALCOMM Incorporated

Inventor： Yongbin Wei ,  Durga Prasad Malladi ,  Tao Luo ,  Srinivas Yerramalli ,  Aleksandar Damnjanovic ,  Hao Xu ,  Peter Gaal ,  Wanshi Chen

IPC: H04W72/00 ,  H04W72/04 ,  H04L27/26 ,  H04W74/08 ,  H04W72/12

CPC classification number: H04W72/0453 ,  H04L27/2601 ,  H04W72/0413 ,  H04W72/1268 ,  H04W74/0833

Abstract: Techniques for wireless communications over a shared radio frequency spectrum band, may include techniques for transmitting uplink data transmissions using allocated uplink resources. Allocated uplink resources may include an uplink channel comprising a number of allocated interlaces of resource blocks (RBs) for use by a user equipment (UE). An incoming data stream may be processed and data separated into each of the allocated interlaces of RBs for the UE. Such separation may be through demultiplexing the data stream to obtain data for the allocated interlaces of RBs. The demultiplexed data may be mapped onto associated resource elements associated with the allocated interlaces of RBs, and transmitted. Different types of uplink channels, such as a physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH) and/or a physical random access channel (PRACH) may be allocated to interlaces of RBs in one or more subframes of a transmitted radio frame.

公开(公告)号：US20170374628A1

公开(公告)日：2017-12-28

申请号：US15680017

申请日：2017-08-17

Applicant: QUALCOMM Incorporated

Inventor： Onkar Dabeer ,  Aleksandar Damnjanovic ,  Srinivas Yerramalli ,  Wanshi Chen ,  Kiran Kumar Somasundaram ,  Naga Bhushan

IPC: H04W52/24 ,  H04W52/26 ,  H04W74/08 ,  H04B7/08 ,  H04W52/22

CPC classification number: H04W52/246 ,  H04B7/0874 ,  H04W52/225 ,  H04W52/241 ,  H04W52/243 ,  H04W52/262 ,  H04W74/0808

Abstract: Techniques are described for contention-based wireless communications channel access that may improve the likelihood that a contention procedure will pass and allow a device to transmit an uplink or downlink transmission using the contention-based channel. Various disclosed techniques may determine a transmit power for a subsequent transmission based on channel characteristics during one or more clear channel assessment (CCA) time durations. The transmit power may be selected to provide a CCA threshold that may increase the likelihood that a device will win contention for the channel during the CCA procedure.