Qualcomm Incorporated

Xiao Feng Wang

Alberto Rico Alvarino

Peter S Gaal

Tao Luo

Liangping Ma

Sony Akkarakaran

Umesh Phuyal

Wanshi Chen

Ayan Sengupta

Bharat Shrestha

Makesh Pravin John Wilson

Jun Ma

Juan Montojo

Wooseok Nam

Sumeeth Nagaraja

Huilin Xu

Hao Xu

Yi Huang

Le Liu

Kaushik Chakraborty

Yan Zhou

Iyab Issam Sakhnini

Renqiu Wang

Seyedkianoush Hosseini

Kapil Bhattad

Seyed Ali Akbar Fakoorian

Jing Lei

Junyi Li

Wei Jennifer Yang

Jing X Sun

Tingfang Ji

Qiang Wu

Bilal Sadiq

Seyong Park

Mungal Singh Dhanda

Xiaoxia Zhang

Tamer Adel Kadous

Muhammad Nazmul Islam

Heechoon Lee

Juergen Cezanne

Kazuki Takeda

Alexandros Manolakos

Amir Aminzadeh Gohari

Sundar Subramanian

Gokul Sridharan

Peter Pui Lok Ang

Joseph Binamira Soriaga

Gabi Sarkis

Shailesh Patil

Chao Wei

Masato Kitazoe

Navid Abedini

Yongbin Wei

Alexei Yurievitch Gorokhov

Jing Jiang

Hung Dinh Ly

Jung Ho Ryu

Tianyang Bai

Stefano M Faccin

Kiran Venugopal

Jay Kumar Sundararajan

Hamed Pezeshki

Prasad Reddy Kadiri

Linhai He

Ashwin Sampath

Amer Catovic

Ying Wang

Naga Bhushan

Krishna Kiran Mukkavilli

Mahmoud Taherzadeh Boroujeni

Maarten Menzo Wentink

Hwan Joon Kwon

Xipeng Zhu

Madhavan Srinivasan Vajapeyam

Konstantinos Dimou

Chih-Ping Li

Frank A Lane

Gavin Bernard Horn

Durga Prasad Malladi

Mostafa Khoshnevisan

Arumugam Chendamarai Kannan

Stephen William Edge

Aamod Dinkar Khandekar

Edward George Tiedemann, Jr

Yan Li

Tom Chin

Raghu Narayan Challa

Yang Yang

Sharad Deepak Sambhwani

Haris Zisimopoulos

Gordon Kent Walker

Peng Cheng

June Namgoong

Stephen Jay Shellhammer

Andrei Dragos Radulescu

Keiichi Kubota

Hari Sankar

Lenaig Genevieve Chaponniere

Valentin Alexandru Gheorghiu

Methods, systems, and devices for wireless communications are described. Described techniques provide for mitigating error in time or frequency adjustments for preambles of a random access procedure. A user equipment may use one value for the adjustment when transmitting data to a non-terrestrial network, but then transmit the preamble of a random access procedure according to a preamble-specific time or frequency adjustment based on one or more indications received from the network (e.g., rather than resetting the adjustment to '0'). By using some signaled value for the preamble-specific timing or frequency adjustment rather than resetting the adjustment to “0,” preamble reception performance may be maintained or improved with as many or fewer position measurements for the UE or non-terrestrial network entity.

Closed loop time and frequency corrections in non-terrestrial networks

Methods, systems, and devices for wireless communications are described. A base station may identify time and frequency resources for a physical downlink shared channel (PDSCH) to be transmitted to a user equipment (UE) in a first transmission time interval (TTI). The base station may transmit configuration information for a control channel search space set in a second TTI. The second TTI may precede the first TTI. The configuration information may include an indication of an absence of a physical downlink control channel (PDCCH) transmission to send in the control channel search space set indicating the identified time and frequency resources for the PDSCH, and a set of time and frequency resources for the control channel search space set. The UE may receive the configuration information and identify the time and frequency resources allocated for the PDSCH in the second TTI, and receive the PDSCH transmission in the second TTI.

Virtual search spaces for beam indication

Certain aspects of the present disclosure are directed to techniques for hybrid automatic repeat request (HARQ) codebook design. For example, a user equipment (UE) configured for feedback processing may comprise a memory and a processor configured to receive, from a base station (BS), a first indication of a first feedback process type for providing feedback to the BS for a plurality of feedback processes of the UE. The memory and the processor may also be configured to receive one or more first downlink transmissions from the BS associated with at least one feedback process of the plurality of feedback processes. The memory and the processor may also be configured to transmit feedback or withhold transmission of feedback to the BS regarding decoding of the one or more first downlink transmissions according to the first feedback process type.

Hybrid automatic repeat request (HARQ) codebook design

Certain aspects of the present disclosure provide techniques for selecting a first orthogonal cover code (OCC) codeword from an OCC matrix for a transmission occurring during a first transmission time interval based on a first pseudo-random codeword allocator function, such as a first pseudo-random permutation matrix, corresponding to the first transmission time interval; and sending the transmission during the first transmission time interval using the first OCC codeword.

Interference randomization in orthogonal cover codes

Methods, systems, and devices for method for wireless communication are described. A user equipment (UE) may receive a first downlink control information scheduling a set of time and frequency resources to a set of downlink shared channel occasions. The UE may also receive, during a first downlink shared channel occasion of the set of downlink shared channel occasions, a second downlink control information indicating a first set of communication parameters specific to a downlink message associated with the first downlink shared channel occasion. The UE may then receive the downlink message during the first downlink shared channel occasion using the first set of communication parameters based on the second downlink control information.

Techniques for scheduling using two-stage control messages

Methods, systems, and devices for wireless communications are described. A base station and a user terminal may communicate via a relaying satellite in a non-terrestrial network. The non-terrestrial network may cause communication disruptions in hybrid automatic repeat request (HARQ) processes due to communication delays. Base stations and user terminals communicating via a satellite may implement dynamically configurable HARQ processes to avoid latency in a wireless communications system.

Dynamically configurable acknowledgement procedures

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information identifying locations of respective random access channel (RACH) resources for a plurality of beams associated with a non-terrestrial network, wherein the plurality of beams are associated with respective frequency regions. The UE may perform a RACH procedure with regard to the selected beam using a RACH resource associated with the selected beam. Numerous other aspects are provided.

Random access channel frequency multiplexing for a non-terrestrial network

Aspects described herein relate to receiving an update value for a timing advance of a satellite link between the UE and a base station, computing, based on the update value for the timing advance, a portion of a timing difference between the update value and a previous value for the timing advance of the satellite link that is corrected by closed loop timing advance control from the base station, computing, based at least in part on computing the portion, a total value for the timing advance of the satellite link, and applying, at the UE and based at least in part on the total value for the timing advance of the satellite link and the closed loop timing advance control, an applied timing advance for communicating with the base station.

Techniques for controlling timing of wireless communications devices in non-terrestrial networks

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from an entity of a non-terrestrial network (NTN), a system information block (SIB) that indicates information relating to one or more NTN SIBs that are to include at least one of ephemeris information or feeder link timing advance information. The UE may receive, from the entity of the NTN, the one or more NTN SIBs based at least in part on the information. Numerous other aspects are described.

Broadcasting of a non-terrestrial network system information block

A method for wireless communication by a user equipment (UE) includes modulating a symbol stream onto at least one subcarrier to generate an uplink signal in a frequency domain for transmitting to a receiver in a non-terrestrial network. The method also includes applying an amount of phase rotation to the at least one subcarrier in the frequency domain. The method further includes transforming the uplink signal from the frequency domain into a time domain uplink signal. The method includes transmitting the time domain uplink signal to the receiver, after applying the phase rotation to the at least one subcarrier.

Compensation of uplink timing errors for non-terrestrial networks

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a group discontinuous reception (DRX) configuration. The UE may receive, based on the group DRX configuration, a notification communication indicative of group handover information associated with a group of UEs that includes the UE. The UE may perform, based on the group handover information, a group handover operation between a source cell and a target cell. Numerous other aspects are described.

Group handover configurations

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.

Uplink reference signal repetition for non-terrestrial networks

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine timing misalignment information for a timing misalignment between an uplink timeline and a downlink timeline associated with a non-terrestrial cell. The UE may transmit the timing misalignment information to a satellite associated with the non-terrestrial cell. Numerous other aspects are described.

User equipment timing misalignment reporting in non-terrestrial networks

Example aspects include a method, apparatus and computer-readable medium of wireless communication at a base station of a mobile network, comprising transmitting system information corresponding to an aerial cell of the mobile network or a cell having at least one aerial sector being formed by one or more uptilt beams of the base station. The aspects further include performing, according to the system information, a random access channel (RACH) procedure with an aerial user equipment (UE). Additionally, the aspects include establishing, via the aerial cell or the at least one aerial sector, a communications link with the aerial UE.

Apparatuses and methods for base stations with uptilt antennas for aerial vehicles

A user equipment (UE) selects or reselects a target cell of a non-terrestrial network or resumes connectivity with the target cell after a satellite handover for a permanently fixed low Earth orbit (LEO) cell. The target cell is a serving or non-serving cell. The UE determines a cell type of the target cell. The cell type may be a LEO cell type, a geostationary Earth orbit (GEO) cell type, a moving cell type, a fixed cell type, a temporarily fixed LEO cell type, or a permanently fixed LEO cell type. The UE completes selection or reselection of the target cell or completes the connectivity with the target cell, based on the cell type.

Cell type selection for non-terrestrial networks

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San Diego, CA, United States of America

Xiao Feng Wang