公开(公告)号：US20180242232A1

公开(公告)日：2018-08-23

申请号：US15675217

申请日：2017-08-11

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Chirag Patel ,  Tamer Kadous

IPC: H04W48/16 ,  H04W72/04 ,  H04W16/14 ,  H04B17/309 ,  H04W16/28

CPC classification number: H04W48/16 ,  H04B7/0695 ,  H04B17/309 ,  H04L5/0037 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/0091 ,  H04W16/14 ,  H04W16/28 ,  H04W72/0453 ,  H04W72/046 ,  H04W88/08

Abstract: Methods, systems, and devices for wireless communications are described. The method may include determining multiple transmission beams (e.g., beamformed directional beams) for transmission of an opportunistic or multi-beam discovery reference signal (DRS) over a shared radio frequency spectrum band. A base station may perform a listen before talk (LBT) procedure for the multiple DRS transmission beams, and transmit, based on the LBT procedure, the DRS over the shared radio frequency spectrum band using a set of the multiple transmission beams (e.g., a set that cleared an LBT procedure). In some cases, the LBT may be performed for each transmission beam, or for a union of all transmission beams, associated with the DRS transmission beams. Alternatively, the base station may determine a contention exempt transmission (CET) period for the shared spectrum band and transmit the DRS using the multiple transmission beams during CET period.

公开(公告)号：US20180070243A1

公开(公告)日：2018-03-08

申请号：US15644517

申请日：2017-07-07

Applicant: QUALCOMM Incorporated

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

IPC: H04W16/14 ,  H04W74/08 ,  H04W4/00 ,  H04L5/14 ,  H04W76/04

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) and base station may communicate using narrow band internet of things (NB-IoT) techniques or enhanced machine type communication (eMTC) in unlicensed spectrum. The UE may be an eMTC device or another device capable of communication without user direction. The UE may identify a geographic region and select a communication mode that is consistent with regulatory restrictions in that region. For example, in some cases, the communication mode may be based on using time division duplexing (TDD), using frequency hopping, or performing a listen-before-talk (LBT) procedure at the base station. A frame structure for TDD may include LBT subframes, uplink portions, downlink portions, and special subframes for switching. The base station may perform LBT procedures in the LBT subframes. If frequency hopping is enabled, a configurable number of TDD frames may be grouped into a hopping frame block.

公开(公告)号：US20170230933A1

公开(公告)日：2017-08-10

申请号：US15408233

申请日：2017-01-17

Applicant: QUALCOMM Incorporated

Inventor： Andrei Radulescu ,  Tao Luo ,  Chirag Patel

IPC: H04W68/02 ,  H04W74/08 ,  H04W16/14

Abstract: Certain aspects of the present disclosure relate to a methods and apparatus for wireless communication. In one aspect, a method of wireless communication comprises assigning, by an access point, an interval of time for transmission on an unlicensed communication spectrum to a LTE-U device, and broadcasting an anchor signal during the interval of time on the unlicensed communication spectrum, the anchor signal comprising a paging indication for the LTE-U device. In another aspect, a method of wireless communication comprises determining, by a LTE-U device, an interval of time for reception of a paging indication on an unlicensed communication spectrum and receiving an anchor signal during the interval of time on the unlicensed communication spectrum, the anchor signal comprising the paging indication.

公开(公告)号：US20170208576A1

公开(公告)日：2017-07-20

申请号：US15405237

申请日：2017-01-12

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Tao Luo ,  Chirag Patel ,  Tamer Kadous

IPC: H04W72/04 ,  H04L1/18

CPC classification number: H04W72/0406 ,  H04L1/1861 ,  H04L5/0007 ,  H04L5/0053 ,  H04L5/1469 ,  H04W72/0446

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit a control message during a special subframe of a radio frame. The UE may determine a payload size of the control message according to a radio resource configuration, or the UE may determine a payload size based on a number of bits associated with information to be sent in the control message. The UE may identify uplink resources of the special subframe to use for the control message based on explicit signaling or implicitly based on information to be sent in the control message. Designated resources for control message transmissions in a special subframe may remain the same or may change in subsequent transmission opportunities. The UE may determine to use the same or different resources of a special subframe in a subsequent transmission opportunity depending on when the UE receives downlink messages.

公开(公告)号：US20170202022A1

公开(公告)日：2017-07-13

申请号：US15404171

申请日：2017-01-11

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Tao Luo ,  Chirag Patel ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04W74/08 ,  H04W72/14 ,  H04W72/04

CPC classification number: H04W74/0816 ,  H04W72/0446 ,  H04W72/14 ,  H04W74/006 ,  H04W74/0808

Abstract: Techniques for performing listen before talk (LBT) channel contention procedures in a shared radio frequency spectrum band are provided. The LBT techniques may include a shortened LBT procedure that may be selected if a base station has reserved a shared channel for a duration of expected user equipment (UE) uplink transmissions, and a full LBT procedure that may be selected if the base station has not reserved the channel for the duration of expected UE uplink transmissions. The shortened LBT procedure may include detecting energy levels of the channel for a relatively short time period relative to the full LBT procedure. The shortened LBT procedure may be selected if a time period between a UE receiving a grant of uplink resources and the beginning of the uplink resources is less than a threshold time value.

公开(公告)号：US20170064657A1

公开(公告)日：2017-03-02

申请号：US15250392

申请日：2016-08-29

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Tao Luo ,  Ahmed Sadek ,  Nachiappan Valliappan ,  Chirag Patel ,  Michael Mingxi Fan

IPC: H04W56/00 ,  H04W16/14

CPC classification number: H04W56/0015 ,  H04L5/005 ,  H04W16/14 ,  H04W56/002

Abstract: Techniques for synchronization on a shared communication medium are disclosed. An access point may select, for example, a common sequence, frequency, and time for a first synchronization signal that is coordinated with one or more other access points. The access point may then transmit the first synchronization signal in accordance with the common sequence, frequency, and time. An access terminal may receive, from an access point, a first synchronization signal having a first sequence and a second synchronization signal having a second sequence. The access terminal may then determine an offset in time between the first synchronization signal and the second synchronization signal, and determine a cell identifier group associated with the access point based on the offset.

Abstract translation: 公开了在共享通信介质上进行同步的技术。 接入点可以选择例如与一个或多个其他接入点协调的第一同步信号的公共序列，频率和时间。 然后，接入点可以根据公共序列，频率和时间发送第一同步信号。 接入终端可以从接入点接收具有第一序列的第一同步信号和具有第二序列的第二同步信号。 然后，接入终端可以确定在第一同步信号和第二同步信号之间的时间偏移，并且基于偏移来确定与接入点相关联的小区标识符组。

公开(公告)号：US11304182B2

公开(公告)日：2022-04-12

申请号：US16341224

申请日：2016-12-07

Applicant: Qualcomm Incorporated

Inventor： Peng Cheng ,  Chirag Patel ,  Vinay Chande ,  Tamer Kadous

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

Abstract: Methods, systems, and devices for wireless communication are described. Various autonomous uplink control channel configurations may be used for unscheduled uplink transmissions. For example, a user equipment (UE) may initiate an unscheduled uplink transmission and may identify an autonomous uplink control channel configuration for the uplink transmission. The UE may transmit control information and data during an initial transmission time interval of a transmission opportunity according to the control channel configuration, where the control channel configuration control may include a number of different waveforms and payload configurations. For example, an autonomous uplink control channel configuration may include control information frequency division multiplexed or time division multiplexed with data and transmitted in one or more frequency interlaces. In some cases, the control channel configuration may include a symbol period for a clear-to-send signal, and one or more symbol periods used a guard period before the data transmission.

公开(公告)号：US10736076B2

公开(公告)日：2020-08-04

申请号：US15408233

申请日：2017-01-17

Applicant: QUALCOMM Incorporated

Inventor： Andrei Radulescu ,  Tao Luo ,  Chirag Patel

IPC: H04W84/02 ,  H04W72/12 ,  H04W76/28 ,  H04W68/02 ,  H04W68/00 ,  H04W16/14 ,  H04W74/08

Abstract: Certain aspects of the present disclosure relate to a methods and apparatus for wireless communication. In one aspect, a method of wireless communication comprises assigning, by an access point, an interval of time for transmission on an unlicensed communication spectrum to a LTE-U device, and broadcasting an anchor signal during the interval of time on the unlicensed communication spectrum, the anchor signal comprising a paging indication for the LTE-U device. In another aspect, a method of wireless communication comprises determining, by a LTE-U device, an interval of time for reception of a paging indication on an unlicensed communication spectrum and receiving an anchor signal during the interval of time on the unlicensed communication spectrum, the anchor signal comprising the paging indication.

公开(公告)号：US10595327B2

公开(公告)日：2020-03-17

申请号：US16383541

申请日：2019-04-12

Applicant: QUALCOMM Incorporated

Inventor： Ahmed Sadek ,  Nachiappan Valliappan ,  Tamer Kadous ,  Chirag Patel ,  Tao Luo

IPC: H04W72/12 ,  H04W16/14 ,  H04L5/00 ,  H04W72/04 ,  H04L5/14 ,  H04W74/08 ,  H04W84/12

Abstract: Techniques for managing access to a shared communication medium are disclosed. Scheduling grants may be sent to different access terminals for different sets of resources for uplink transmission on the communication medium. A series of re-contention gaps may be scheduled for access terminal contention within or between the different sets of resources. Uplink and downlink transmission on the communication medium may be silenced during each of the series of re-contention gaps. Moreover, an access terminal may receive a scheduling grant that allocates a set of resources to the access terminal for uplink transmission on a communication medium and contend for access to the communication medium based on the scheduling grant. The access terminal may then selectively transmit uplink traffic over the allocated set of resources based on the contending.

公开(公告)号：US10542444B2

公开(公告)日：2020-01-21

申请号：US15417002

申请日：2017-01-26

Applicant: QUALCOMM Incorporated

Inventor： Andrei Radulescu ,  Tao Luo ,  Chirag Patel

IPC: H04W24/08 ,  H04W76/38 ,  H04B17/336 ,  H04L5/00 ,  H04W48/10 ,  H04W48/12 ,  H04W48/16 ,  H04W72/04 ,  H04W48/06 ,  H04W84/12

Abstract: Certain aspects of the present disclosure relate to a methods and apparatus for wireless communication. In one aspect, a method of wireless communication comprises receiving, by a long term evolution unlicensed (LTE-U) device, a plurality of signals from an access point on an unlicensed communication spectrum. The method further comprises determining, by the device, whether a signal of the plurality of signals comprises a discovery signal. The method further comprises monitoring a radio link based on, the signal if the signal is determined to comprise the discovery signal.