公开(公告)号：US20210251004A1

公开(公告)日：2021-08-12

申请号：US17160058

申请日：2021-01-27

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Vinay Chande ,  Srinivas Yerramalli ,  Xiaoxia Zhang ,  Aleksandar Damnjanovic ,  Jing Sun ,  Tao Luo

IPC: H04W74/08 ,  H04W24/08 ,  H04W16/28

Abstract: Systems and methods implementing receiver assisted channel access procedures configured to enable access for a potential transmitter while avoiding introducing unacceptable interference with respect to ongoing communications in a shared channel are described. In examples, a receiver assisted channel access procedure implements a LBT enhanced CCA (eCCA) technique in which receiver assisted transmitter sensing is utilized. A receiver assisted channel access procedure may implement monitoring of a shared channel during a contiguous contention period for one or more instances of a periodic session protection signal.

公开(公告)号：US20210251002A1

公开(公告)日：2021-08-12

申请号：US17248733

申请日：2021-02-04

Applicant: QUALCOMM INCORPORATED

Inventor： Jing Sun ,  Vinay Chande ,  Arumugam Chendamarai Kannan ,  Srinivas Yerramalli ,  Xiaoxia Zhang ,  Tao Luo ,  Aleksandar Damnjanovic

IPC: H04W74/08 ,  H04W16/14 ,  H04W16/28 ,  H04W52/24

Abstract: Methods related to wireless communications systems and transmissions in an unlicensed radio frequency band of a shared spectrum are provided. A device determines whether one or more criteria are satisfied for accessing an unlicensed band of a shared spectrum without performing a listen-before-talk (LBT). The device transmits a communication signal in the unlicensed band without performing LBT in response to determining that the one or more criteria are satisfied.

公开(公告)号：US20210234751A1

公开(公告)日：2021-07-29

申请号：US16751869

申请日：2020-01-24

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Xiaoxia Zhang

IPC: H04L12/24 ,  H04L29/06 ,  H04W72/04 ,  H04W16/14

Abstract: Timer configurations for new radio (NR) unlicensed (NR-U) and NR shared spectrum (NR-SS) operations are disclosed. In NR-U and NR-SS operations, certain event timers may be interrupted by a user equipment (UE) when it detects that its serving base station has failed a listen before talk (LBT) procedure, thereby losing access to the shared communication spectrum. When the UE detects a subsequent successful LBT, it resumes the progression of the event timer. In NR-SS operations, the UE may also interrupt the applicable timers either in all slots dedicated to another operator or in all slots in which the serving base station does not have transmission access.

公开(公告)号：US11057926B2

公开(公告)日：2021-07-06

申请号：US15880507

申请日：2018-01-25

Applicant: QUALCOMM Incorporated

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

IPC: H04W72/14 ,  H04W72/04 ,  H04W72/12 ,  H04L1/08 ,  H04W28/02 ,  H04W74/08

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an uplink grant that conveys an indication of a multi-transmission opportunity (TxOP) grant. The UE may transmit, during a first TxOP, a first uplink transmission in one or more subframes in accordance with the multi-TxOP grant. The UE may transmit, during a second TxOP, a second uplink transmission in one or more subframes in accordance with the multi-TxOP grant.

公开(公告)号：US11057139B2

公开(公告)日：2021-07-06

申请号：US16660130

申请日：2019-10-22

Applicant: QUALCOMM Incorporated

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

IPC: H04W4/00 ,  H04J11/00 ,  H04W74/08 ,  H04W74/00 ,  H04W16/14 ,  H04W72/12 ,  H04B7/26

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：US11038650B2

公开(公告)日：2021-06-15

申请号：US15969536

申请日：2018-05-02

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Jing Sun ,  Wanshi Chen ,  Alberto Rico Alvarino ,  Peter Gaal

IPC: H04L5/00 ,  H04W72/04 ,  H04W74/08 ,  H04W16/14 ,  H04L25/02

Abstract: Configuration of downlink and uplink partial subframes in shared radio frequency (RF) spectrum is discussed. The various described aspects provide for different configurations for start and end transmissions from base stations and user equipments (UEs) when transmitting over partial subframes. With downlink initial partial subframes, a uniform puncturing may be used to reduce the number of resource elements (REs) available for downlink transmission without causing the base station to re-precode any of the data. Additional aspect for downlink partial subframe transmission allows for downlink control channels to identify multiple start points within the subframe at short downlink shared channel locations. On the uplink aspect, UEs may be informed with configurations for both full and partial subframe transmissions. The UE will select which configuration to use based on whether it will transmit on full or partial subframes. Additionally, a UE have scheduled or semi-scheduled modes for partial subframe transmissions.

公开(公告)号：US11032804B2

公开(公告)日：2021-06-08

申请号：US16544614

申请日：2019-08-19

Applicant: QUALCOMM Incorporated

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

IPC: H04W72/04 ,  H04L5/00 ,  H04W28/06 ,  H04W76/27 ,  H04J13/00 ,  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：US11025403B2

公开(公告)日：2021-06-01

申请号：US15991829

申请日：2018-05-29

Applicant: QUALCOMM Incorporated

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

IPC: H04L5/14 ,  H04L5/00 ,  H04L1/00 ,  H04W72/04

Abstract: A method, an apparatus, and a computer program for wireless communication that allows for greater scheduling flexibility of physical resources are disclosed. A UE receives information from a base station about a time division duplex (TDD) frame structure of a plurality of frames that include a plurality of subframes. The UE determines a control channel search space within the plurality of subframes based on the information. The UE determines a search strategy including a maximum aggregation level based on the control channel search space. The UE performs a blind decoding of the control channel search space with the search strategy to obtain control information. The control channel search space may include a size and a location of a subset of the DL subframes allowed to carry the control information. The UE may determine a plurality of UL subframes assigned for transmitting scheduled UL resources associated with a UL control signaling.

公开(公告)号：US20210160845A1

公开(公告)日：2021-05-27

申请号：US17166867

申请日：2021-02-03

Applicant: QUALCOMM Incorporated

Inventor： Kapil Bhattad ,  Jing Sun ,  Xiaoxia Zhang ,  Yongbin Wei ,  Tamer Kadous ,  Srinivas Yerramalli ,  Tao Luo

IPC: H04W72/04 ,  H04W76/11 ,  H04W24/08 ,  H04L1/00 ,  H04W76/27 ,  H04L5/00 ,  H04W74/08

Abstract: A base station may configure a set of autonomous uplink (AUL) resources for a specific base station receive beam, or the AUL resources may be configured for specific user equipment (UEs) or user groups. Additionally, the AUL resources may be configured to include a sensing portion, a data portion, or both. As an example, a UE may receive an AUL configuration that includes an indication of a set of AUL resources that are specific to a base station receive beam. The UE may then determine that the set of AUL resources is available and perform an AUL transmission of uplink data using the set of beam-specific AUL resources. Additionally or alternatively, the UE may perform the AUL transmission with respective portions that include a sensing signal and the uplink data. The base station may use the sensing signal to determine a receive beam on which to receive the uplink data.

公开(公告)号：US11012979B2

公开(公告)日：2021-05-18

申请号：US16663003

申请日：2019-10-24

Applicant: QUALCOMM Incorporated

Inventor： Yan Zhou ,  Tao Luo ,  Wooseok Nam ,  Makesh Pravin John Wilson ,  Arumugam Chendamarai Kannan ,  Xiaoxia Zhang ,  Jing Sun ,  Srinivas Yerramalli

IPC: H04W72/02 ,  H04W72/04 ,  H04L5/00 ,  H04B7/08 ,  H04W24/02

Abstract: In order to overcome problems that a UE may face in determining CORESETs and beams for communication with the base station during a COT, a method, apparatus, and computer-readable medium are provided for a base station to indicate to the UE which CORESET(s), QCL relationships, UL resources, and/or spatial relationships are selected for a COT. A UE receives an indication of a set of CORESETs selected from a plurality of CORESETs or a set of QCL relationships selected from a plurality of QCL relationships. The UE determines the set of CORESETs from the plurality of CORESETs or the set of QCL relationships from the plurality of QCL relationships based on the indication received. A UE receives an indication of a set of UL resources or a set of spatial relations. The UE determines the set of UL resources or the set of spatial relations based on the indication received.