公开(公告)号：US11172504B2

公开(公告)日：2021-11-09

申请号：US16562687

申请日：2019-09-06

Applicant: QUALCOMM Incorporated

Inventor： Yisheng Xue ,  Aleksandar Damnjanovic ,  Xiaoxia Zhang ,  Jing Sun ,  Yongbin Wei ,  Tamer Kadous

IPC: H04J1/16 ,  H04W74/00 ,  H04L5/00 ,  H04W16/14 ,  H04W72/04

Abstract: Coordination of listen before talk (LBT) structure in new radio (NR) unlicensed (NR-U) multi-channel access operations is disclosed. In one aspect, when a base station determines to access shared communication spectrum, it may transmit an LBT structure signal that identifies the current LBT structure. The base station would then attempt access to the shared spectrum according to the LBT structure. In another aspect, a coordination server is used to manage access to the shared spectrum. Each node desiring access registers with the coordination server, which provides access parameters for the accessing node to use that increases the likelihood of successful access. The accessing nodes will transmit the selected access configuration used to access the shared spectrum, wherein the access configuration is selected based on the access parameters.

公开(公告)号：US20210289488A1

公开(公告)日：2021-09-16

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 ,  H04L5/00 ,  H04W74/08

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：US11122566B2

公开(公告)日：2021-09-14

申请号：US16020400

申请日：2018-06-27

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Jing Sun ,  Tamer Kadous

IPC: H04W72/04 ,  H04W52/16 ,  H04L5/00 ,  H04W52/36 ,  H04L1/00 ,  H04L27/26 ,  H04W52/50 ,  H04W16/14 ,  H04W74/08

Abstract: Wireless communications systems and methods related to communicating in a frequency spectrum using interlaced frequency channels and non-interlaced frequency channels are provided. A first wireless communication device selects a waveform structure between an interlaced frequency structure and a non-interlaced frequency structure for communicating in a frequency spectrum. The first wireless communication device communicates, with a second wireless communication device in the frequency spectrum, a communication signal based on the selected waveform structure. The interlaced frequency structure includes at least a first set of frequency bands in the frequency spectrum, the first set of frequency bands interlacing with a second set of frequency bands in the frequency spectrum. The non-interlaced frequency structure includes one or more contiguous frequency bands in the frequency spectrum.

公开(公告)号：US11115161B2

公开(公告)日：2021-09-07

申请号：US16400822

申请日：2019-05-01

Applicant: QUALCOMM Incorporated

Inventor： Andrei Dragos Radulescu ,  Srinivas Yerramalli ,  Xiaoxia Zhang ,  Aleksandar Damnjanovic ,  Tamer Kadous ,  Jing Sun ,  Yongbin Wei

IPC: H04L5/00 ,  H04W72/12 ,  H04W72/04 ,  H04W88/10 ,  H04W74/08 ,  H04L27/00 ,  H04W84/12

Abstract: Scheduling around frame based equipment (FBE) idle periods reduces the flexibility of scheduling and partitioning. This leads to a latency caused by waiting for the next downlink scheduling opportunity and skipping over unused uplink scheduling slots. According to certain aspects, to reduce overhead caused by idle time and ensure full downlink scheduling, a base station (BS) alternates between idle periods and channel occupancy time every fixed frame period with one or more other synchronized BSs, between components carriers of the BS, or both. Thus, a BS can always schedule downlink on a carrier during an idle period scheduled for a different BS and/or a different carrier.

公开(公告)号：US11089518B2

公开(公告)日：2021-08-10

申请号：US16534781

申请日：2019-08-07

Applicant: QUALCOMM Incorporated

Inventor： Aleksandar Damnjanovic ,  Xiaoxia Zhang ,  Arumugam Chendamarai Kannan ,  Jing Sun ,  Yongbin Wei ,  Tamer Kadous

IPC: H04L12/28 ,  H04W28/26 ,  H04W74/08 ,  H04L27/26 ,  H04L27/00 ,  H04W16/14 ,  H04J1/16

Abstract: Methods, systems, and devices for wireless communications are described. The method includes receiving a transmission from a first wireless device at a second wireless device, the transmission including a first coexistence preamble configured to reserve a channel of a shared radio frequency band for a first period of time, a first segment, and a second segment, where the first coexistence preamble comprises an initial channel reservation sequence and a data field indicating information about the first period of time; and transmitting, during a gap period between the first segment and the second segment, a receiver protection signal from the second wireless device, the receiver protection signal including a second coexistence preamble configured to reserve the channel of the shared radio frequency band for a second period of time associated with the second transmission segment.

公开(公告)号：US11082187B2

公开(公告)日：2021-08-03

申请号：US16366430

申请日：2019-03-27

Applicant: QUALCOMM Incorporated

Inventor： Jing Sun ,  Xiaoxia Zhang ,  Tamer Kadous

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

Abstract: Certain aspects of the present disclosure provide techniques for rate-matching data on a per transmission reception point (TRP) basis for single downlink control information (DCI) multi-TRP transmissions. Transmitters operating according to the present disclosure use a per TRP rate matching technique in which the rate-matching order is to first rate-match across spatial layers transmitted by a TRP, then across frequency, then across time, and then to another TRP, where remaining data is rate-matched across the spatial layers of that other TRP, then across frequency, and then across time. The described per TRP rate-matching technique causes code blocks of a transport block to be transmitted by one TRP, instead of each code block being transmitted by a group of TRPs.

公开(公告)号：US11044735B2

公开(公告)日：2021-06-22

申请号：US16721705

申请日：2019-12-19

Applicant: QUALCOMM Incorporated

Inventor： Sony Akkarakaran ,  Tao Luo ,  Jing Sun ,  Rahul Malik ,  Tamer Kadous ,  Akula Reddy

IPC: H04W72/12 ,  H04J1/02 ,  H04L5/00 ,  H04W72/04 ,  H04L27/26

Abstract: Aspects of the disclosure relate to methods and apparatus of wireless communication to support frequency division multiplexing (FDM) of multiple waveforms. The methods and apparatus schedule FDM symbols where the scheduling of the FDM symbols is selectively based on one or more waveform parameters during a time interval when the FDM symbols are transmitted. The FDM symbols are then transmitted over the time interval. Further aspects also include the reception of the FDM symbols in a receiver where the waveform parameters are applied for decoding based on application of the waveform parameters.

公开(公告)号：US11006415B2

公开(公告)日：2021-05-11

申请号：US16180772

申请日：2018-11-05

Applicant: QUALCOMM Incorporated

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

IPC: H04W72/04 ,  H04W72/02 ,  H04B1/713 ,  H04W84/04 ,  H04L5/00

Abstract: A base station (BS) may communicate with a user equipment (UE) using a subset of channels. The BS may select a subset of a set of channels for use in communication with the UE. The BS may transmit, to the UE, a signal to identify the subset of channels. In some aspects, the BS may transmit, and the UE may receive, a channel list indicator identifying the subset of channels. The channel list indicator may include an integer value, which the UE may use to identify a subset of combinatorial factors. Based at least in part on the subset of combinatorial factors, the UE may identify the subset of the set of channels for use in communication with the BS. The UE may communicate with the BS using at least one of the subset of the set of channels, such as in a frequency hopping communication system and/or the like.

公开(公告)号：US10986665B2

公开(公告)日：2021-04-20

申请号：US16046500

申请日：2018-07-26

Applicant: QUALCOMM Incorporated

Inventor： Taesang Yoo ,  Xiaoxia Zhang ,  Jing Sun ,  Aleksandar Damnjanovic ,  Tamer Kadous

IPC: H04W74/08 ,  H01Q1/24 ,  H01Q21/00 ,  H04L12/26 ,  H04W72/08 ,  H04W88/08

Abstract: Quasi-colocation (QCL) for listen before talk (LBT) procedures is disclosed. A base station having a plurality of antennas may identify one or more groups of QCL antennas. Various aspects provide for different rules defining the QCL relationship, such as base on interference experienced by the antennas, a physical or logical connection of the antennas and LBT coupling, or synchronization. QCL may further be determined across multiple shared channels, such as based on frequency separation or frequency band of the channels. Once grouped as QCL, the base station performs the LBT procedure to reserve access to the one or more shared communication channels. If the LBT is successful, the base station may then transmit a channel reservation preamble on the shared communication channels in response.

公开(公告)号：US10965514B2

公开(公告)日：2021-03-30

申请号：US16168629

申请日：2018-10-23

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Yongbin Wei ,  Tamer Kadous ,  Zhifei Fan ,  Jing Sun

IPC: H04L27/26 ,  H04L27/00 ,  H04L25/02 ,  H04L27/227 ,  H04W72/04 ,  H04W16/14

Abstract: Methods, systems, and devices for wireless communications are described. In some wireless systems, different wireless devices may communicate using different radio access technologies (RATs) in a shared radio frequency spectrum. Prior to communicating on a channel in the shared radio frequency spectrum, a wireless device may transmit a training field as part of a preamble in a transmission on the channel to reserve the channel for the transmission. As described herein, a training field transmitted by a wireless device using one RAT may be transmitted with an autocorrelation property associated with training fields of another RAT. As such, a wireless device configured to communicate using the other RAT may be able to receive and identify the training field (e.g., based on the autocorrelation property), and the wireless device may use the additional techniques described herein to determine an availability of the channel based on the training field.