公开(公告)号：US20220131653A1

公开(公告)日：2022-04-28

申请号：US17451749

申请日：2021-10-21

Applicant: QUALCOMM Incorporated

Inventor： Liangping MA ,  Xiao Feng Wang ,  Huilin Xu ,  Ayan Sengupta ,  Alberto Rico Alvarino ,  Jun Ma ,  Peter Gaal ,  Bharat Shrestha ,  Umesh Phuyal

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

Abstract: Certain aspects of the present disclosure provide techniques for providing feedback. For example, a user equipment (UE) may receive, from a network node, a configuration of a search space comprising time and frequency resources available to the network node for communicating a downlink control channel, the configuration indicating a feedback process type corresponding to the search space. The UE may also receive, from the network node, the downlink control channel in the search space. The UE may also receive a downlink transmission scheduled by the downlink control channel. The UE may selectively provide feedback to the network node regarding decoding of the downlink transmission according to the feedback process type corresponding to the search space.

公开(公告)号：US20220116254A1

公开(公告)日：2022-04-14

申请号：US17493532

申请日：2021-10-04

Applicant: QUALCOMM Incorporated

Inventor： Xiao Feng Wang ,  Iyab Issam Sakhnini ,  Peter Gaal ,  Huilin Xu ,  Jun Ma ,  Wei Yang

IPC: H04L27/26 ,  H04L5/00

Abstract: This disclosure relates to methods, devices, and systems for wireless communications, and more particularly uplink reference signal repetition for non-terrestrial networks. A user terminal in a non-terrestrial network may identify an uplink reference signal format that includes a comb-based pattern of subcarriers within a first orthogonal frequency-division multiplexing (OFDM) symbol and within a second OFDM symbol for transmission of an uplink reference signal. The user terminal may map the uplink reference signal to a first set of subcarriers within the first OFDM symbol and to a second set of subcarriers within the second OFDM symbol in accordance with the comb-based pattern. Thereby, the user terminal may transmit, to a base station in the non-terrestrial network, the uplink reference signal on the mapped subcarriers of the OFDM symbols, which may be transmitted coherently.

公开(公告)号：US20220070823A1

公开(公告)日：2022-03-03

申请号：US17375944

申请日：2021-07-14

Applicant: QUALCOMM Incorporated

Inventor： Jun Ma ,  Xiaoxia Zhang ,  Qiang Wu ,  Tao Luo ,  Iyab Issam Sakhnini ,  Mehmet Izzet Gurelli ,  Ahmed Abdelaziz Ibrahim Zewail ,  Jing Sun ,  Wooseok Nam ,  Anantha Krishna Karthik Nagarajan ,  Peter Gaal ,  Zhifei Fan ,  Juan Montojo ,  Sony Akkarakaran ,  Arumugam Chendamarai Kannan

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

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, a first tracking reference signal configuration and a second tracking reference signal configuration. The first tracking reference signal configuration may include a first set of parameters and the second tracking reference signal configuration may include a second set of parameters. The UE, the base station, or both may identify an indicator for selection from among the first tracking reference signal configuration and the second tracking reference signal configuration. The UE may receive, from the base station and based on the identified indicator for selection, a tracking reference signal in accordance with the first tracking reference signal configuration or the second tracking reference signal configuration.

公开(公告)号：US20220015148A1

公开(公告)日：2022-01-13

申请号：US17364230

申请日：2021-06-30

Applicant: QUALCOMM Incorporated

Inventor： Ayan Sengupta ,  Xiao Feng Wang ,  Alberto Rico Alvarino ,  Peter Gaal ,  Liangping Ma ,  Le Liu ,  Jun Ma ,  Bharat Shrestha ,  Umesh Phuyal

IPC: H04W74/08 ,  H04B7/185 ,  H04W72/04 ,  H04W74/00

Abstract: Methods, systems, and devices for wireless communications are described in which random access preambles may be designed to provide for relatively low inter-carrier interference (ICI) of adjacent available frequency resources in a non-terrestrial network (NTN). Random access preambles for NTN random access requests may be selected from a first set of random access preambles that are different from a second set of random access preambles for terrestrial random access requests. The first set of random access preambles may be a subset of the second set of random access preambles. The first set of random access preambles may be provided for contention-based random access (CBRA) and contention-free random access (CFRA) preambles may be configured by a base station from random access preambles that correspond to or are different from the second set of random access preambles.

公开(公告)号：US20210337598A1

公开(公告)日：2021-10-28

申请号：US17240708

申请日：2021-04-26

Applicant: QUALCOMM Incorporated

Inventor： Jun Ma ,  Qiang Wu ,  Dan Zhang ,  Alberto Rico Alvarino ,  Xiao Feng Wang ,  Liangping Ma ,  Peter Gaal ,  Iyab Issam Sakhnini

IPC: H04W74/08 ,  H04W72/04

Abstract: Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may account for propagation delay when initiating a random access (RACH) procedure. For example, the UE may determine transmission timing for a RACH preamble based on an estimated propagation delay, such that the RACH preamble is received at a base station approximately at the beginning of a slot. To support reliable communication of the RACH preamble, the UE may implement a timing offset. In some examples, the base station may configure the UE with the timing offset using system information. Alternatively, the UE may be pre-configured with the timing offset. By determining the transmission timing for the RACH preamble further based on the timing offset, the UE may ensure that the RACH preamble is received at the base station after a slot boundary (e.g., avoiding causing interference to communications in a previous slot).

公开(公告)号：US20210242935A1

公开(公告)日：2021-08-05

申请号：US17154497

申请日：2021-01-21

Applicant: QUALCOMM Incorporated

Inventor： Iyab Issam Sakhnini ,  Jun Ma ,  Qiang Wu ,  Xiao Feng Wang ,  Dan Zhang ,  Huilin Xu

IPC: H04B7/185 ,  H04B7/06 ,  H04W52/14 ,  H04W68/00 ,  H04W72/04

Abstract: This disclosure provides systems, methods and apparatus for communicating a satellite behavior change. In one aspect, a satellite identifies a satellite behavior change to occur for the satellite of a non-terrestrial network for cellular communications. The apparatus also signals the satellite behavior change to a user equipment serviced by the satellite. In another aspect, a user equipment obtains, from a satellite servicing the user equipment, a signaling of a satellite behavior change to occur for the satellite. The user equipment also adjusts one or more user equipment parameters for cellular communication based on the obtained signaling. The satellite behavior change may include a satellite attitude or a transmit power or coverage area of one or more satellite beams. The user equipment parameters may include satellite or beam selection or reselection to listen to paging information, satellite or beam handover parameters, or transmit power control parameters.

公开(公告)号：US20210105825A1

公开(公告)日：2021-04-08

申请号：US17028883

申请日：2020-09-22

Applicant: QUALCOMM Incorporated

Inventor： Xiao Feng Wang ,  Iyab Issam Sakhnini ,  Peter Gaal ,  Huilin Xu ,  Jun Ma ,  Dan Zhang

IPC: H04W74/08 ,  H04W74/00

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may communicate with a base station by initiating a random access procedure with a multi-root preamble. The UE may receive, from the base station, a configuration message that indicates one or more parameters for the multi-root preamble. The one or more parameters may include cyclic shifts, phase rotations, and sequence roots corresponding to a plurality of sequences. The base station may identify the one or more parameters and transmit the configuration message based on the identifying. The UE may identify the one or more parameters for the multi-root preamble based on the configuration message and/or a pre-configuration at the UE. The UE may transmit, to the base station, the multi-root preamble based at least in part on the one or more parameters.

公开(公告)号：US10959201B2

公开(公告)日：2021-03-23

申请号：US16373416

申请日：2019-04-02

Applicant: QUALCOMM Incorporated

Inventor： Xiao Feng Wang ,  Peter Gaal ,  Iyab Issam Sakhnini ,  Jun Ma

IPC: H04W56/00 ,  H04B7/185 ,  H04W76/10 ,  H04W72/04 ,  H04W48/04

Abstract: Methods, systems, devices, and apparatuses for wireless communications are described that support techniques for initial access in wireless systems. Generally, the described techniques provide for communicating satellite information to simplify initial access procedures. A wireless communications system may signal relevant information (e.g., Doppler information or propagation delay information) associated with communications through a satellite to mobile terminals (e.g., user equipment (UEs)). The mobile terminals may utilize the relevant information to generate an uplink transmission (e.g., a random access message or an initial access message) that compensates for the Doppler shift and propagation delay that may be experienced by communications between the mobile terminals and the satellite.

公开(公告)号：US20210075501A1

公开(公告)日：2021-03-11

申请号：US16562289

申请日：2019-09-05

Applicant: QUALCOMM Incorporated

Inventor： Huilin Xu ,  Xiao Feng Wang ,  Iyab Issam Sakhnini ,  Peter Gaal ,  Jun Ma

IPC: H04B7/185 ,  H04L12/26 ,  H04W76/14

Abstract: Methods, systems, and devices for wireless communications are described and may include a user terminal and a satellite establishing a communication link over a channel having a channel delay and a medium access control-control element (MAC-CE) delay being determined based on the channel delay. The user terminal and the satellite may be within a non-terrestrial network (NTN). The user terminal may receive a MAC-CE command that indicates a communication parameter to be implemented or adjusted. The user terminal may transmit feedback, for example, to the satellite in response to the MAC-CE command, and the user terminal and the satellite may communicate according to the communication parameter in the MAC-CE command after an end of the MAC-CE delay.

公开(公告)号：US10244453B2

公开(公告)日：2019-03-26

申请号：US15149008

申请日：2016-05-06

Applicant: QUALCOMM Incorporated

Inventor： Seyed Shwan Ashrafi ,  Sumeeth Nagaraja ,  Dan Vassilovski ,  Dan Zhang ,  James Determan ,  Gene Wesley Marsh ,  Jun Ma

IPC: H04W36/24 ,  H04B17/336 ,  H04B7/185 ,  H04B7/195 ,  H04W36/30 ,  H04W84/06

Abstract: Methods and apparatuses for managing inter-satellite handovers are provided to allow a user terminal to reduce the frequency of handovers while maintaining a sufficiently high system capacity in a non-geosynchronous satellite communication system. The method and apparatus for managing inter-satellite handovers may be implemented in a gateway, in infrastructure connected to a gateway, in a user terminal, or in a satellite.