Qualcomm Incorporated

Other

Shimman Arvind Patel

Wanshi Chen

Peter S Gaal

Hao Xu

Seyedkianoush Hosseini

Aleksandar Damnjanovic

Jing X Sun

Yongbin Wei

Juan Montojo

Tingfang Ji

Krishna Kiran Mukkavilli

Durga Prasad Malladi

Muhammad Sayed Khairy Abdelghaffar

Tao Luo

Alberto Rico Alvarino

Naga Bhushan

Srinivas Yerramalli

Huilin Xu

Ahmed Attia Abotabl

June Namgoong

Hung Dinh Ly

Madhavan Srinivasan Vajapeyam

Michael Mao Wang

Xiaoxia Zhang

Taesang Yoo

Ozcan Ozturk

Renqiu Wang

Hwan Joon Kwon

Saeid Sahraei

Onkar Jayant Dabeer

Gokul Sridharan

Alexandros Manolakos

Joseph Binamira Soriaga

Gabi Sarkis

Aamod Dinkar Khandekar

Roland Reinhard Rick

Seyed Ali Akbar Fakoorian

Jing Lei

Tao Chen

Miguel Griot

Gilbert Christopher Sih

Farrokh Abrishamkar

Serguei A Glazko

Keith William Saints

Thomas Wilborn

Thunyachate Ekvetchavit

Jing Sun

Jing Jiang

Peter Pui Lok Ang

Heechoon Lee

John Edward Smee

Gordon Kent Walker

Abdelrahman Mohamed Ahmed Mohamed Ibrahim

Joseph Patrick Burke

Parvathanathan Subrahmanya

Brian K Butler

Haitao Zhang

Tao Li

Kuei-Chiang Lai

Andrew K Kan

Wei Zeng

Haitong Sun

Yi Huang

Jelena Damnjanovic

Edward George Tiedemann, Jr

Yisheng Xue

Jun Wang

Raghu Narayan Challa

Avneesh Agrawal

Stein Arne Lundby

Yu Zhang

Yeliz Tokgoz

Inyup Kang

Sivaramakrishna Veerepalli

Qingxin Chen

Jack M Holtzman

Kiran Kumar Somasundaram

Allen Minh-Triet Tran

Christopher Patrick

Leonid Razoumov

Runxin Wang

Joseph Cheung

Gene Fong

James E Beckman

Jian Wei

Mark Roh

Dai Lu

Pillappakkam Bahukutumbi Srinivas

Bruce R Meagher

Lida Akhoondzadehasl

Srinivas Varadarajan

Edward G Tiedemann

Charline Hao

Matthew Michael

Seguei A Glazko

Gregory Foerster

Jonathan R Reeves

Gokul Sridaran

Aleksandar Damjanovic

Methods, systems, and devices for wireless communication are described that provide for reduced timing between certain downlink communications and responsive uplink communications relative to certain legacy systems (e.g., legacy LTE systems). A user equipment (UE) or base station may be capable of operating using two or more timing configurations that each include an associated time period between receipt of a downlink communication (e.g., a grant of uplink resources or shared channel data) and a responsive uplink communication (e.g., an uplink transmission using the granted uplink resources or feedback of successful reception of the shared channel data). In cases where a UE or base station are capable of two or more timing configurations, a timing configuration for a transmission may be determined and the responsive uplink communication transmitted according to the determined timing configuration.

Latency reduction techniques in wireless communications

Methods, systems, and devices for wireless communications are described. A method for wireless communication may include receiving a single frequency networked composite reference signal (SFNed RS) at a first port of a user equipment (UE) and receiving a reference signal (RS) at a second port of the UE that is different than the first port of the UE. The method may also include performing channel estimation for at least one of the first port or the second port based at least in part on receiving the SFNed RS and the RS. A method for wireless communication may include transmitting a first portion of an SFNed RS from a first port of a first transmit/reception point to a UE and transmitting a downlink control information message to the UE that indicates at least one transmission configuration indicator state identifier that identifies the SFNed RS.

Consideration for demodulation reference signal and tracking reference signal quasi co-location relationship

Certain aspects of the present disclosure provide techniques that may be used to help enable low latency communications between a user equipment (UE) and a base station (BS) using quick uplink channels that enable a reduced transmission time interval (TTI). An example method generally includes identifying a plurality of slots in a subframe, receiving a resource configuration for an uplink channel, wherein the resource configuration is associated with a first slot of the plurality of slots, determining a resource for transmitting the uplink channel in a second slot of the plurality of slots, wherein the resource is determined based on the resource configuration associated with the first slot of the plurality of slots, and transmitting the uplink channel in the second slot using the determined resource.

Uplink channel design for slot-based transmission time interval (TTI)

Methods, systems, and devices for wireless communications are described. The described techniques generally support downlink transmissions. For example, a user equipment (UE) may receive a resource configuration for reception of a downlink transmission within a repetition window, the resource configuration including an indicator of a repetition window size for the downlink transmission. The UE may monitor, according to the resource configuration, one or more transmission time intervals (TTIs) of the repetition window for reception of the downlink transmission. In some cases, the downlink transmission may be a grant-free downlink transmission. Here, the UE may attempt to decode the grant-free downlink transmission during the one or more TTIs based at least in part on the repetition window size. Using the described techniques, the UE may efficiently determine one or more decoding parameters for the grant-free downlink transmission, thereby providing benefits in terms of latency reduction, power consumption, etc.

Grant-free downlink transmission

Full-duplex communication techniques are described. Some aspects may utilize full-duplex-slot formats, such as may be provided in addition to or in the alternative to uplink, downlink, and flexible slot formats. A full-duplex slot implemented in accordance with a full-duplex-slot format provides a slot in which the frequency band may be used for both uplink and downlink transmissions. Downlink and/or uplink transmissions of a full-duplex slot may occur in overlapping frequency bands or in adjacent frequency bands. A first wireless device may transmit slot signaling comprising one or more full-duplex-slot-indicator parameters. A second wireless device may base one or more full-duplex slot configuration determinations on a full-duplex-slot configuration. The second wireless device may apply one or more full-duplex-slot-indicator-parameter rules with respect to full-duplex-slot-indicator parameters for determining a full-duplex-slot format. Other aspects and features are also claimed and described.

Full duplex communication techniques

Aspects described herein relate to determining whether full duplex (FD) communications are configured during resources for communicating one or more messages of a random access procedure, where the FD communications comprising uplink communications and downlink communications occurring in a same frequency band, and responsive to the determining whether the FD communications are configured during the resources, transmitting the one or more messages of the random access procedure using the resources.

Techniques for performing random access in full duplex wireless communications

Methods, systems, and devices for wireless communications are described. A receiving device (such as a user equipment (UE)) may receive from a transmitting device (such as a base station), a configuration of full duplex communication resources for a set of slots. The receiving device may receive a pre-emption indication identifying that at least a portion of the full duplex communication resources in one or more slots of the set of slots is unavailable for communication, and may determine a remaining portion of the full duplex communication resources in the one or more slots based on the received pre-emption indication. The receiving device may then communicate with the transmitting device using the remaining portion of the full duplex communication resources.

Pre-emption indication for full duplex communications

Methods, systems, and devices for wireless communication using various patterns of data and reference signals are described. For example, in a system that supports operation using different duration transmission time intervals (TTIs), a base station may initiate communication with a user equipment (UE) or between two UEs, and UEs may communicate with the base station or with one another using an indicated pattern of data and reference signals. The base station may send a downlink control message indicating a transmission pattern selected from a set of patterns. UEs may identify the pattern based on the indicator and decode a sequence of data and reference signals based on the pattern. In some examples, the sequence may include a set of TTIs, which may have a shorter duration than other TTIs.

Low latency communication

Certain aspects of the present disclosure generally relate to techniques for selecting a base graph to be used for wireless communications. Selection can be based on a variety of factors. Abase graph can be used to derive a low-density parity-check (LDPC) code used for encoding a retransmission of an original transmission. An exemplary method generally includes selecting, based on a modulation and coding scheme (MCS) and a resource allocation (RA) for transmitting a codeword, a base graph (BG), from which to derive a low density parity check (LDPC) code for use in encoding data bits in the codeword (e.g., encoding data bits of a bitstream such that some redundant bits are included in the codeword), encoding the data bits to generate the codeword using the LDPC code derived from the selected BG, and transmitting the codeword using the MCS via resources of the

Communication techniques applying low-density parity-check code base graph selection

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive downlink control information (DCI) that schedules an uplink communication in an uplink frequency band. The UE may transmit, at an uplink frequency within the uplink frequency band, the uplink communication with a power that varies over the uplink frequency band based at least in part on a location of the uplink frequency relative to a downlink frequency band associated with the UE. Numerous other aspects are provided.

Uplink power control for full duplex communication

Handling of asynchronous multi-carrier is discussed. In new radio (NR) fifth generation (5G) networks, the potential for provision of multi-carrier operations (e.g., carrier aggregation (CA), dual connectivity (DC), etc.) that include asynchronous component carriers (CCs) has been proposed. However, because of the asynchronous relationship network entities, such as base stations and user equipments (UEs) will manage the asynchronous CCs by obtaining timing offset information, either through derivation or direct signaling, and determining a subframe correspondence based on the timing offset relative to a reference CC. By determining the subframe correspondence to the reference CC, the base stations and UEs can accurately map communications over the asynchronous CCs to the appropriate subframes across CCs.

Asynchronous CA handling

Aspects relate to adaptation of the modulation and coding scheme (MCS) of a downlink transmission to a scheduled entity that overlaps in time with an uplink transmission from the scheduled entity when the scheduled entity is operating in a full-duplex mode. A transport block corresponding to the downlink transmission may include a plurality of code block groups (CBGs). When at least a portion of the CBGs overlap in time with the uplink transmission, the MCS of the entire transport block or the MCS of the overlapping CBGs may be adjusted to accommodate and/or mitigate interference between downlink and uplink transmissions. The CBGs may further be time-interleaved over a plurality of symbols allocated for the downlink transmission to accommodate and/or mitigate interference between downlink and uplink transmissions. Other aspects, features, and embodiments are also claimed and described.

Modulation and coding scheme (MCS) adaptation in full-duplex mode

Methods, systems, and devices for wireless communications are described. A frequency band configuration for a full-duplex slot may be indicated, where a frequency band configuration may include one or more downlink frequency bands and one or more uplink frequency bands. In some cases, a frequency band configuration may also include one or more guard bands. A user equipment (UE) may determine the frequency band configuration for a full-duplex slot based on a frequency configuration indication, which may include an index for a table of frequency band configurations, one or more bitmaps, or respective start and length indications for each frequency band. A frequency band configuration may apply to one slot or to multiple slots.

Configuration of frequency bands for full-duplex slots

Systems and methods in which one or more wireless communication stations implement duplex-mode remediation to facilitate the signal communication when an issue with respect to self-interference is identified are described. Duplex-mode remediation may be implemented for various communication scenarios, such as for random access phase communications, for communications having different priorities, etc. A wireless communication station may implement one or more changes with respect to the full duplex operation of the wireless communication station based upon determining that an issue with respect to self-interference may be, or is being, experienced, such as to provide for a wireless communication station operating in an in-band full duplex mode to increase interference cancellation and/or to fall back to a sub-band full duplex mode or a half duplex mode, to provide for a wireless communication station operating in a sub-band full duplex mode to increase interference cancellation and/or to fall back to a half duplex mode.

Duplex-mode remediation for self interference

Symbol alignment and power scaling are provided for different length transmission time intervals (TTIs) within predefined boundaries, such as boundaries of a slot of a subframe. Described techniques provide for identifying time and/or frequency resources for one or more TTIs and allocating such resources based on a location within a subframe, pilot signals that may be transmitted using the resources, other processing timelines, or any combination thereof. In some cases, a power allocation for symbols within a TTI may be determined based on the allocated resources for the TTI. Frequency hopping patterns and power scaling for three-symbol TTIs are also provided.

Uplink transmission techniques in low latency wireless communication systems

Growing community of inventors

San Diego, CA, United States of America

Shimman Arvind Patel