WO2023212910A1

WO2023212910A1 - Lp-wus for backscatter communications

Info

Publication number: WO2023212910A1
Application number: PCT/CN2022/091146
Authority: WO
Inventors: Chao Wei; Min Huang; Kangqi LIU; Mingxi YIN; Rui Hu; Hao Xu
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2023-11-09
Anticipated expiration: 2024-11-06

Abstract

Apparatus, methods, and computer program products for enabling backscatter communication are provided. An example method may include receiving a configuration associated with a time-domain resource allocation (TDRA) for an uplink (UL) transmission from a network entity, the UL transmission being associated with a wake-up signal (WUS) for a wireless device, the UL transmission being further associated with a plurality of slots including a first slot and a second slot. The example method may further include transmitting the WUS to the wireless device, the WUS comprising at least one of a first burst transmission associated with a first TDRA in the first slot or a second burst transmission associated with a second TDRA in the second slot.

Description

LP-WUS FOR BACKSCATTER COMMUNICATIONS

TECHNICAL FIELD

The present disclosure relates generally to communication systems, and more particularly, to wireless communication systems with wake-up signal (WUS) for passive wireless devices and backscatter (BC) communications.

INTRODUCTION

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR) . 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT) ) , and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra-reliable low latency communications (URLLC) . Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

BRIEF SUMMARY

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects. This summary neither identifies key or critical elements of all aspects nor delineates the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus at a user equipment (UE) are provided. The apparatus may include a memory and at least one processor coupled to the memory. The memory and the at least one processor coupled to the memory may be configured to receive a configuration associated with a time-domain resource allocation (TDRA) for an uplink (UL) transmission from a network entity, the UL transmission may be associated with a wake-up signal (WUS) for a wireless device, the UL transmission may be associated with a plurality of slots including a first slot and a second slot. The memory and the at least one processor coupled to the memory may be further configured to transmit the WUS to the wireless device, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in the first slot of a plurality of slots or a second burst transmission associated with a second TDRA in the second slot of the plurality of slots.

In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus at a passive wireless device are provided. The apparatus may include a memory and at least one processor coupled to the memory. The memory and the at least one processor coupled to the memory may be configured to receive a wake-up signal (WUS) from a user equipment (UE) , the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots. The memory and the at least one processor coupled to the memory may be further configured to transmit a communication to a network entity based on the received WUS, where the communication may be transmitted after a wake-up delay period.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.

FIG. 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure.

FIG. 2B is a diagram illustrating an example of DL channels within a subframe, in accordance with various aspects of the present disclosure.

FIG. 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure.

FIG. 2D is a diagram illustrating an example of UL channels within a subframe, in accordance with various aspects of the present disclosure.

FIG. 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.

FIG. 4 is a diagram illustrating example low power wake-up radio (LP-WUR) device.

FIG. 5 is a diagram illustrating example communications between a reader and a passive wireless device.

FIG. 6 is a diagram illustrating example communication between a base station, a UE, and a passive device.

FIG. 7 is a diagram illustrating example communications between a network entity, a UE, and a passive wireless device.

FIG. 8 is a diagram illustrating example transmissions of a UE and a passive device.

FIG. 9 is a diagram illustrating example communications between a network entity, a UE, and a passive wireless device.

FIG. 10A is a diagram illustrating example mapping of WUR identifier (ID) and slots in a wake-up radio (WUR) frame.

FIG. 10B is a diagram illustrating example WUR preamble in a WUR frame.

FIG. 11 is a flowchart of a method of wireless communication.

FIG. 12 is a flowchart of a method of wireless communication.

FIG. 13 is a flowchart of a method of wireless communication.

FIG. 14 is a diagram illustrating an example of a hardware implementation for an example apparatus and/or network entity.

FIG. 15 is a diagram illustrating an example of a hardware implementation for an example network entity.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the drawings describes various configurations and does not represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Several aspects of telecommunication systems are presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements” ) . These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.

Accordingly, in one or more example aspects, implementations, and/or use cases, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, such computer-readable media can comprise a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

While aspects, implementations, and/or use cases are described in this application by illustration to some examples, additional or different aspects, implementations and/or use cases may come about in many different arrangements and scenarios. Aspects, implementations, and/or use cases described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, aspects, implementations, and/or use cases may come about via integrated chip implementations and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (AI) -enabled devices, etc. ) . While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described examples may occur. Aspects, implementations, and/or use cases may range a spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more techniques herein. In some practical settings, devices incorporating described aspects and features may also include additional components and features for implementation and practice of claimed and described aspect. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor (s) , interleaver, adders/summers, etc. ) . Techniques described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc. of varying sizes, shapes, and constitution.

Deployment of communication systems, such as 5G NR systems, may be arranged in multiple manners with various components or constituent parts. In a 5G NR system, or network, a network node, a network entity, a mobility element of a network, a radio access network (RAN) node, a core network node, a network element, or a network equipment, such as a base station (BS) , or one or more units (or one or more components) performing base station functionality, may be implemented in an aggregated or disaggregated architecture. For example, a BS (such as a Node B (NB) , evolved NB (eNB) , NR BS, 5G NB, access point (AP) , a transmit receive point (TRP) , or a cell, etc. ) may be implemented as an aggregated base station (also known as a standalone BS or a monolithic BS) or a disaggregated base station.

An aggregated base station may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node. A disaggregated base station may be configured to utilize a protocol stack that is physically or logically distributed among two or more units (such as one or more central or centralized units (CUs) , one or more distributed units (DUs) , or one or more radio units (RUs) ) . In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes. The DUs may be implemented to communicate with one or more RUs. Each of the CU, DU and RU can be implemented as virtual units, i.e., a virtual central unit (VCU) , a virtual distributed unit (VDU) , or a virtual radio unit (VRU) .

Base station operation or network design may consider aggregation characteristics of base station functionality. For example, disaggregated base stations may be utilized in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (such as the network configuration sponsored by the O-RAN Alliance) ) , or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN) ) . Disaggregation may include distributing functionality across two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which can enable flexibility in network design. The various units of the disaggregated base station, or disaggregated RAN architecture, can be configured for wired or wireless communication with at least one other unit.

FIG. 1 is a diagram 100 illustrating an example of a wireless communications system and an access network. The illustrated wireless communications system includes a disaggregated base station architecture. The disaggregated base station architecture may include one or more CUs 110 that can communicate directly with a core network 120 via a backhaul link, or indirectly with the core network 120 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 125 via an E2 link, or a Non-Real Time (Non-RT) RIC 115 associated with a Service Management and Orchestration (SMO) Framework 105, or both) . A CU 110 may communicate with one or more DUs 130 via respective midhaul links, such as an F1 interface. The DUs 130 may communicate with one or more RUs 140 via respective fronthaul links. The RUs 140 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, the UE 104 may be simultaneously served by multiple RUs 140.

Each of the units, i.e., the CUs 110, the DUs 130, the RUs 140, as well as the Near-RT RICs 125, the Non-RT RICs 115, and the SMO Framework 105, may include one or more interfaces or be coupled to one or more interfaces configured to receive or to transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communication interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or to transmit signals over a wired transmission medium to one or more of the other units. Additionally, the units can include a wireless interface, which may include a receiver, a transmitter, or a transceiver (such as an RF transceiver) , configured to receive or to transmit signals, or both, over a wireless transmission medium to one or more of the other units.

In some aspects, the CU 110 may host one or more higher layer control functions. Such control functions can include radio resource control (RRC) , packet data convergence protocol (PDCP) , service data adaptation protocol (SDAP) , or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 110. The CU 110 may be configured to handle user plane functionality (i.e., Central Unit –User Plane (CU-UP) ) , control plane functionality (i.e., Central Unit –Control Plane (CU-CP) ) , or a combination thereof. In some implementations, the CU 110 can be logically split into one or more CU-UP units and one or more CU-CP units. The CU-UP unit can communicate bidirectionally with the CU-CP unit via an interface, such as an E1 interface when implemented in an O-RAN configuration. The CU 110 can be implemented to communicate with the DU 130, as necessary, for network control and signaling.

The DU 130 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 140. In some aspects, the DU 130 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation, demodulation, or the like) depending, at least in part, on a functional split, such as those defined by 3GPP. In some aspects, the DU 130 may further host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 130, or with the control functions hosted by the CU 110.

Lower-layer functionality can be implemented by one or more RUs 140. In some deployments, an RU 140, controlled by a DU 130, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT) , inverse FFT (iFFT) , digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like) , or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU (s) 140 can be implemented to handle over the air (OTA) communication with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control and user plane communication with the RU (s) 140 can be controlled by the corresponding DU 130. In some scenarios, this configuration can enable the DU (s) 130 and the CU 110 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

The SMO Framework 105 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 105 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements that may be managed via an operations and maintenance interface (such as an O1 interface) . For virtualized network elements, the SMO Framework 105 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 190) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface) . Such virtualized network elements can include, but are not limited to, CUs 110, DUs 130, RUs 140 and Near-RT RICs 125. In some implementations, the SMO Framework 105 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 111, via an O1 interface. Additionally, in some implementations, the SMO Framework 105 can communicate directly with one or more RUs 140 via an O1 interface. The SMO Framework 105 also may include a Non-RT RIC 115 configured to support functionality of the SMO Framework 105.

The Non-RT RIC 115 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, artificial intelligence (AI) /machine learning (ML) (AI/ML) workflows including model training and updates, or policy-based guidance of applications/features in the Near-RT RIC 125. The Non-RT RIC 115 may be coupled to or communicate with (such as via an A1 interface) the Near-RT RIC 125. The Near-RT RIC 125 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 110, one or more DUs 130, or both, as well as an O-eNB, with the Near-RT RIC 125.

In some implementations, to generate AI/ML models to be deployed in the Near-RT RIC 125, the Non-RT RIC 115 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 125 and may be received at the SMO Framework 105 or the Non-RT RIC 115 from non-network data sources or from network functions. In some examples, the Non-RT RIC 115 or the Near-RT RIC 125 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 115 may monitor long-term trends and patterns for performance and employ AI/ML models to perform corrective actions through the SMO Framework 105 (such as reconfiguration via O1) or via creation of RAN management policies (such as A1 policies) .

At least one of the CU 110, the DU 130, and the RU 140 may be referred to as a base station 102. Accordingly, a base station 102 may include one or more of the CU 110, the DU 130, and the RU 140 (each component indicated with dotted lines to signify that each component may or may not be included in the base station 102) . The base station 102 provides an access point to the core network 120 for a UE 104. The base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station) . The small cells include femtocells, picocells, and microcells. A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) . The communication links between the RUs 140 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to an RU 140 and/or downlink (DL) (also referred to as forward link) transmissions from an RU 140 to a UE 104. The communication links may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations 102 /UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL) . The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .

Certain UEs 104 may communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL wireless wide area network (WWAN) spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) . D2D communication may be through a variety of wireless D2D communications systems, such as for example, Bluetooth, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi AP 150 in communication with UEs 104 (also referred to as Wi-Fi stations (STAs) ) via communication link 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like. When communicating in an unlicensed frequency spectrum, the UEs 104 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz –7.125 GHz) and FR2 (24.25 GHz –52.6 GHz) . Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz –300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified an operating band for these mid-band frequencies as frequency range designation FR3 (7.125 GHz –24.25 GHz) . Frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics, and thus may effectively extend features of FR1 and/or FR2 into mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR2-2 (52.6 GHz –71 GHz) , FR4 (71 GHz –114.25 GHz) , and FR5 (114.25 GHz –300 GHz) . Each of these higher frequency bands falls within the EHF band.

With the above aspects in mind, unless specifically stated otherwise, the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR2-2, and/or FR5, or may be within the EHF band.

The base station 102 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate beamforming. The base station 102 may transmit a beamformed signal 182 to the UE 104 in one or more transmit directions. The UE 104 may receive the beamformed signal from the base station 102 in one or more receive directions. The UE 104 may also transmit a beamformed signal 184 to the base station 102 in one or more transmit directions. The base station 102 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 102 /UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 102 /UE 104. The transmit and receive directions for the base station 102 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.

The base station 102 may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a TRP, network node, network entity, network equipment, or some other suitable terminology. The base station 102 can be implemented as an integrated access and backhaul (IAB) node, a relay node, a sidelink node, an aggregated (monolithic) base station with a baseband unit (BBU) (including a CU and a DU) and an RU, or as a disaggregated base station including one or more of a CU, a DU, and/or an RU.

The core network 120 may include an Access and Mobility Management Function (AMF) 161, a Session Management Function (SMF) 162, a User Plane Function (UPF) 163, a Unified Data Management (UDM) 164, one or more location servers 168, and other functional entities. The AMF 161 is the control node that processes the signaling between the UEs 104 and the core network 120. The AMF 161 supports registration management, connection management, mobility management, and other functions. The SMF 162 supports session management and other functions. The UPF 163 supports packet routing, packet forwarding, and other functions. The UDM 164 supports the generation of authentication and key agreement (AKA) credentials, user identification handling, access authorization, and subscription management. The one or more location servers 168 are illustrated as including a Gateway Mobile Location Center (GMLC) 165 and a Location Management Function (LMF) 166. However, generally, the one or more location servers 168 may include one or more location/positioning servers, which may include one or more of the GMLC 165, the LMF 166, a position determination entity (PDE) , a serving mobile location center (SMLC) , a mobile positioning center (MPC) , or the like. The GMLC 165 and the LMF 166 support UE location services. The GMLC 165 provides an interface for clients/applications (e.g., emergency services) for accessing UE positioning information. The LMF 166 receives measurements and assistance information from the NG-RAN and the UE 104 via the AMF 161 to compute the position of the UE 104. The NG-RAN may utilize one or more positioning methods in order to determine the position of the UE 104. Positioning the UE 104 may involve signal measurements, a position estimate, and an optional velocity computation based on the measurements. The signal measurements may be made by the UE 104 and/or the serving base station 102. The signals measured may be based on one or more of a satellite positioning system (SPS) 170 (e.g., one or more of a Global Navigation Satellite System (GNSS) , global position system (GPS) , non-terrestrial network (NTN) , or other satellite position/location system) , LTE signals, wireless local area network (WLAN) signals, Bluetooth signals, a terrestrial beacon system (TBS) , sensor-based information (e.g., barometric pressure sensor, motion sensor) , NR enhanced cell ID (NR E-CID) methods, NR signals (e.g., multi-round trip time (Multi-RTT) , DL angle-of-departure (DL-AoD) , DL time difference of arrival (DL-TDOA) , UL time difference of arrival (UL-TDOA) , and UL angle-of-arrival (UL-AoA) positioning) , and/or other systems/signals/sensors.

Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) . The UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. In some scenarios, the term UE may also apply to one or more companion devices such as in a device constellation arrangement. One or more of these devices may collectively access the network and/or individually access the network.

Referring again to FIG. 1, in some aspects, the UE 104 may include a BC component 198. In some aspects, the BC component 198 may be configured to receive a configuration associated with a time-domain resource allocation (TDRA) for an uplink (UL) transmission from a network entity, where the UL transmission may be associated with a wake-up signal (WUS) for a wireless device 199, where the UL transmission may be associated with a plurality of slots including a first slot and a second slot. The wireless device 199 may be a passive wireless device (which may be a passive UE) . In some aspects, the BC component 198 may be further configured to transmit the WUS to the wireless device, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in the first slot of a plurality of slots or a second burst transmission associated with a second TDRA in the second slot of the plurality of slots.

In some aspects, the wireless device 199 may receive a wake-up signal (WUS) from a user equipment (UE) , the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots. The wireless device 199 may also transmit a communication to a network entity based on the received WUS, where the communication may be transmitted after a wake-up delay period. In some aspects, the wireless device 199 may include means for receiving a WUS from a UE, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots. In some aspects, the wireless device 199 may also include means for transmitting a communication to a network entity based on the received WUS, where the communication may be transmitted after a wake-up delay period.

Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

As described herein, a node (which may be referred to as a node, a network node, a network entity, or a wireless node) may include, be, or be included in (e.g., be a component of) a base station (e.g., any base station described herein) , a UE (e.g., any UE described herein) , a network controller, an apparatus, a device, a computing system, an integrated access and backhauling (IAB) node, a distributed unit (DU) , a central unit (CU) , a remote unit (RU) , and/or another processing entity configured to perform any of the techniques described herein. For example, a network node may be a UE. As another example, a network node may be a base station or network entity. As another example, a first network node may be configured to communicate with a second network node or a third network node. In one aspect of this example, the first network node may be a UE, the second network node may be a base station, and the third network node may be a UE. In another aspect of this example, the first network node may be a UE, the second network node may be a base station, and the third network node may be a base station. In yet other aspects of this example, the first, second, and third network nodes may be different relative to these examples. Similarly, reference to a UE, base station, apparatus, device, computing system, or the like may include disclosure of the UE, base station, apparatus, device, computing system, or the like being a network node. For example, disclosure that a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node. Consistent with this disclosure, once a specific example is broadened in accordance with this disclosure (e.g., a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node) , the broader example of the narrower example may be interpreted in the reverse, but in a broad open-ended way. In the example above where a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node, the first network node may refer to a first UE, a first base station, a first apparatus, a first device, a first computing system, a first set of one or more one or more components, a first processing entity, or the like configured to receive the information; and the second network node may refer to a second UE, a second base station, a second apparatus, a second device, a second computing system, a second set of one or more components, a second processing entity, or the like.

As described herein, communication of information (e.g., any information, signal, or the like) may be described in various aspects using different terminology. Disclosure of one communication term includes disclosure of other communication terms. For example, a first network node may be described as being configured to transmit information to a second network node. In this example and consistent with this disclosure, disclosure that the first network node is configured to transmit information to the second network node includes disclosure that the first network node is configured to provide, send, output, communicate, or transmit information to the second network node. Similarly, in this example and consistent with this disclosure, disclosure that the first network node is configured to transmit information to the second network node includes disclosure that the second network node is configured to receive, obtain, or decode the information that is provided, sent, output, communicated, or transmitted by the first network node.

FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be frequency division duplexed (FDD) in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for either DL or UL, or may be time division duplexed (TDD) in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL. In the examples provided by FIGs. 2A, 2C, the 5G NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL) , where D is DL, U is UL, and F is flexible for use between DL/UL, and subframe 3 being configured with slot format 1 (with all UL) . While

subframes

3, 4 are shown with slot formats 1, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) .

FIGs. 2A-2D illustrate a frame structure, and the aspects of the present disclosure may be applicable to other wireless communication technologies, which may have a different frame structure and/or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms) . Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 14 or 12 symbols, depending on whether the cyclic prefix (CP) is normal or extended. For normal CP, each slot may include 14 symbols, and for extended CP, each slot may include 12 symbols. The symbols on DL may be CP orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbols. The symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission) . The number of slots within a subframe is based on the CP and the numerology. The numerology defines the subcarrier spacing (SCS) and, effectively, the symbol length/duration, which is equal to 1/SCS.

For normal CP (14 symbols/slot) , different numerologies μ 0 to 4 allow for 1, 2, 4, 8, and 16 slots, respectively, per subframe. For extended CP, the numerology 2 allows for 4 slots per subframe. Accordingly, for normal CP and numerology μ, there are 14 symbols/slot and 2 ^μ slots/subframe. The subcarrier spacing may be equal to 2 ^μ* 15 kHz, where μ is the numerology 0 to 4. As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=4 has a subcarrier spacing of 240 kHz. The symbol length/duration is inversely related to the subcarrier spacing. FIGs. 2A-2D provide an example of normal CP with 14 symbols per slot and numerology μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Within a set of frames, there may be one or more different bandwidth parts (BWPs) (see FIG. 2B) that are frequency division multiplexed. Each BWP may have a particular numerology and CP (normal or extended) .

A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.

As illustrated in FIG. 2A, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and phase tracking RS (PT-RS) .

FIG. 2B illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs) , each CCE including six RE groups (REGs) , each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within one BWP may be referred to as a control resource set (CORESET) . A UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during PDCCH monitoring occasions on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at greater and/or lower frequencies across the channel bandwidth. A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a physical layer identity. A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the DM-RS. The physical broadcast channel (PBCH) , which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block (also referred to as SS block (SSB) ) . The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) . The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.

As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) . The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. The UE may transmit sounding reference signals (SRS) . The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

FIG. 2D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and hybrid automatic repeat request (HARQ) acknowledgment (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACK and/or negative ACK (NACK) ) . The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and/or UCI.

FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, Internet protocol (IP) packets may be provided to a controller/processor 375. The controller/processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) . The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318Tx. Each transmitter 318Tx may modulate a radio frequency (RF) carrier with a respective spatial stream for transmission.

At the UE 350, each receiver 354Rx receives a signal through its respective antenna 352. Each receiver 354Rx recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) . The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.

The controller/processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets. The controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with the DL transmission by the base station 310, the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354Tx. Each transmitter 354Tx may modulate an RF carrier with a respective spatial stream for transmission.

The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318Rx receives a signal through its respective antenna 320. Each receiver 318Rx recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

The controller/processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets. The controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with BC component 198 of FIG. 1.

Backscatter communication may enable radio frequency identification (RFID) . For example, a reader may send a continuous waveform signal and interrogate commands. An RF tag (which is a passive wireless device) may harvest energy from the continuous waveform signal and may respond to the interrogation by varying its input impedance (e.g., between conjugate match and strongly mismatched) , therefore modulating the backscattered signals.

In some wireless communication systems, passive wireless devices such as zero-power passive IoT wireless devices may be included. Such passive wireless devices may be without active RF components and may perform transmissions based on backscatter communication and may perform reception based on envelope detection or an envelope detector. Backscatter communication may modulate information on an incoming RF signal (which may be a carrier wave that may carry communication between other devices) by an adaptation of antenna load impedance. A passive wireless device may be battery-less or battery assisted. For example, a passive wireless device may operate based on energy harvesting from an incoming radio wave with or without a battery as an additional power source. A passive wireless device may have low power consumption, such as between 1 microwatt to 1000 microwatts. Such passive wireless devices may be devices for inventory management, wireless sensors, or the like.

A passive wireless device may use a LP-WUR. A LP-WUR may be a radio receiver circuit (and may be an envelope detector) with a low energy consumption. FIG. 4 is a diagram 400 illustrating example device 402 (such as an active UE) with a LP-WUR. The active UE may use LP-WUR to dynamically activate main radio 406 for reducing power consumption. When there is no data to receive, main radio 406 may be off unless there is something to transmit. The LP-WUR may keep actively monitoring the WUS 408 with low power. When there is data to receive, the LP-WUR may receive on-demand the WUS 408 via the ultra-low power wake-up receiver 404 and activate a main radio 406. Data may be transmitted and received by the main radio 406. Such a LP-WUR may enable frequent WUS monitoring to meet a latency specification and may present low energy consumption compared to some of duty-cycling schemes. Such a WUR may also avoid excessive unnecessary main radio wakeup for PDCCH monitoring. The term “WUS” may refer to a signal used for waking up a passive wireless device (e.g., so that it may perform transmissions) .

WURs may also be used for downlink reception by passive devices powered by energy harvesting and triggering backscatter transmission in uplink. For example, FIG. 5 is a diagram 500 illustrating example communications between a reader (which may be a UE) and a passive wireless device (which may be a passive UE) . The passive may be UE using WUR for downlink reception and to activate backscatter uplink communication. For passive device, there may be no main radio since its uplink transmission is based on backscattering. After powering-up, the passive wireless device may use the wakeup receiver (which may be a LP-WUR 504) to decode a wake-up signal 502 to decide whether it may wake up to start a backscatter transmission or not by identifying a unique WUR ID assigned to each passive wireless device. The backscatter transmission 510 may be carried by a carrier wave 508 and may occur N slots after the wake-up signal 502, where N represents a wake-up delay 506 with the value either fixed or configurable.

FIG. 6 is a diagram 600 illustrating example communication between a base station, a UE, and a passive wireless device. As illustrated in FIG. 6, a UE 602 may be in communication with a base station 606 based on a UE-to-Universal Mobile Telecommunications Service (UMTS) Terrestrial Radio Access Network (UTRAN) (Uu) interface. The UE 602 may transmit a WUS to a passive wireless device 604, where the carrier wave may carry UL data to the base station 606. After waking up based on reception of the WUS, the passive wireless device 604 may transmit a backscatter communication to the base station 606 based on a carrier wave from the UE 602 .

For backscatter communication, a forward link (FL) may be a potential bottleneck due to high sensitivity (e.g., -20 dBm) for energy supply and bi-static deployment may be used to improve link range. For example, a UE may transmit an energy signal (such as a carrier wave) and a WUS to passive wireless devices which may in turn start backscatter transmission to a remote base station on-demand. For bi-static backscatter communication, the use of some WUSs, such as sequence-based WUSs using multi on-off keying (OOK) waveforms, may degrade throughput because the UE may not be able to transmit UL data when a WUS is transmitted. To resolve this, multiplexing of WUS and data using OFDMA or FDM may be utilized, but power splitting between data and WUS may significantly degrade backscatter performance. Aspects provided herein enable using UL transmission for WUS to wake-up passive wireless devices and enable associated backscatter uplink transmission from the passive wireless devices. Aspects provided herein may enable more efficient backscatter communication and UL transmissions.

FIG. 7 is a diagram 700 illustrating example communications between a network entity 704, a UE 702, and a passive wireless device 706. As illustrated in FIG. 7, in some aspects, the UE 702 may transmit a WUS 710 to the passive wireless device 706. In some aspects, the WUS 710 may be an LP-WUS. After receiving the WUS 710, the passive wireless device may accordingly wake-up at 712 and transmit a backscatter communication to the network entity 704 based on a carrier wave 714 originated from the UE 702. In some aspects, the WUS 710 may be a series of bursts of UL transmissions in a WUR frame (aWUR frame may be a frame including the WUS and a passive wireless device may process one or more slots in the WUR frame to decode a WUS) , such as a PUSCH, an SRS, or a PUCCH with different positions or widths within a slot. For example, two or more bursts may be generated by adjusting the position of a burst within a slot (e.g., position of a burst relative to a start or end of a slot) based on a same burst width, or by adjusting the burst width within a slot based on a burst starting position, or a combination of adjusting the position and the burst width.

FIG. 8 is a diagram 800 illustrating example transmissions of a UE and a passive device that includes a WUS. As illustrated in FIG. 8, within a WUR frame carrying the WUS 710, a PUSCH 802A may be a first distance “a” (e.g., in time) from a beginning of a corresponding slot, a PUSCH 802B may be a second distance “b” (e.g., in time) from a beginning of a corresponding slot, a PUSCH 802C may be the second distance “b” (e.g., in time) from a beginning of a corresponding slot, and a PUSCH 802D may be the first distance “a” (e.g., in time) from a beginning of a corresponding slot. The PUSCH 802A, the PUSCH 802B, the PUSCH 802C, and the PUSCH 802D may be a set of PUSCH repetitions. The set of PUSCH repetitions may convey WUS information “0110” where each first distance “a” represents “0” and each second distance “b” represents “1” . The WUS information may be a WUR ID. The WUR ID may be an ID associated with the passive wireless device 706 and may, when decoded by the passive wireless device 706, cause the passive wireless device 706 to wake-up. The waveform 808 may be detected by the passive wireless device 706 and may accordingly decode “0110” based on the waveform 808. In some aspects, when WUS is transmitted based on unicast, the carried information may be an ID associated with the passive UE. For WUS transmitted based on groupcast or broadcast, the carried information may be a defined control command, e.g., indicating a passive UE entering a read zone.

Similarly, as illustrated in FIG. 8, within a WUR frame carrying the WUS 710, a PUSCH 812A may have a first width “a” (e.g., width in the time domain) , a PUSCH 812B may have a second width “b” , a PUSCH 812C may have the first width “a” , and the PUSCH 812C may have the second width “b” . The PUSCH 812A, the PUSCH 812B, the PUSCH 812C, and the PUSCH 812D may be a set of PUSCH repetitions. The set of PUSCH repetitions may convey WUS information “0101” where each first width “a” represents “0” and each second width “b” represents “1” . The waveform 818 may be detected by the passive wireless device 706 and may accordingly decode “0101” based on the waveform 818.

Referring back to FIG. 7, the WUR ID may be modulated by a burst position (or width, or a combination of position and width) within a slot and the burst of the PUSCH, the SRS, or the PUCCH may carry UL data from a UE 702 to a network entity 704. In some aspects, the UE 702 may not transmit between two bursts in the WUS 710 to allow the passive wireless device 706 to decode the WUR ID information in the WUS 710 (e.g., by using an energy detector/LP-WUR circuit) .

The UE 702 may transmit the WUS based on a configuration 708 received from the network entity 704. The configuration 708 may be a separate configuration or may be a scheduling associated with the UL transmissions in the WUS 710. In some aspects, the configuration 708 may include TDRA for the UL transmissions in the WUS 710. A TDRA may be a

In some aspects, the UL transmissions in the WUS 710 may be a PUCCH or a PUSCH of a type where different symbol allocations or TDRA patterns are used in each repetition slot based on a configured sequence representing a WUR ID to be transmitted in the WUR frame. The configured sequence may map the TDRA to the slots in the WUR frame. For example, when two TDRA patterns are configured for the bursts carrying the repetition of PUCCH/PUSCH, a first TDRA pattern may be used in a slot if the bit value in the sequence associated with the slot is 0; a second TDRA pattern may be used otherwise (e.g., if the bit value in the sequence associated with the slot is 1) . The configuration 708 may be carried in DCI (such as DCI 709 scheduling the UL transmissions in the WUS 710 or a separate DCI) , in a medium access control (MAC) control element (MAC-CE) , or a radio resource control (RRC) message. If the TDRA in the configuration 708 is configured by DCI, a DCI field “TDRA” may indicate an entry including at least two resource allocations with different starting position of the repetition (relative to a starting position of the slot) or width (e.g., width in the time domain) within a slot. If the TDRA in the configuration 708 is configured by a higher layer, more than one TDRA pattern may be configured. The UE 702 may further receive an activation command for applying TDRA mapping based on the sequence or WUR ID.

In some aspects, configuration 708 may be carried in DCI 709 scheduling the UL transmissions in the WUS 710 or a separate DCI, a MAC-CE, or an RRC message. If the configuration 708 is carried in DCI or a MAC-CE, the WUR ID may be dynamic and WUS 710 may be transmitted via unicast. If the configuration 708 is carried in an RRC message, the WUR ID may be semi-static and WUS 710 may be broadcast or groupcast and may inform the passive wireless device 706 about whether it entered a read zone of the UE 702. In some aspects, UL transmissions, such as PUSCH/PUCCH repetitions with slot dependent symbol allocation and mapping may be used in the WUS 710. For example, FIG. 9 is a diagram 900 illustrating example communications between the network entity 704, the UE 702, and the passive wireless device 706. As illustrated in FIG. 9, the network entity 704 may transmit a configuration 902 (e.g., corresponding with the configuration 708) via RRC signaling, a MAC-CE, or DCI to the UE 702. The configuration 902 may indicate a WUR ID “10011100” associated with the passive wireless device 706. The network entity 704 may also transmit a DCI 904 to indicate TDRA patterns (1, 2) associated with representing “1” and “0” , where pattern 1 may represent “1” and pattern 2 may represent “0” . The UE 702 may transmit a set of PUCCH or PUSCH repetitions 908 (which may correspond with WUS 710) that carry the WUR ID “10011100” by applying TDRA pattern 1 or TDRA pattern 2 in each repetition in the set of PUCCH or PUSCH repetitions 908. The passive wireless device 706 may accordingly detect the WUR ID “10011100” after decoding the set of PUCCH or PUSCH repetitions 908 based on the TDRA pattern.

In some aspects, based on TDD, some slots in the WUR frame associated with the WUS 710 may not be available for PUSCH/PUCCH repetition and the UE 702 may drop or postpone UL transmission to a next available slot to not collide with DL slot or SSB reception. In some aspects, in a WUR frame, all the slots may be available for WUR ID or TDRA mapping. If a UL transmission in a slot is dropped or postponed due to a collision, the corresponding WUR ID bit may be dropped and not mapped. The WUR ID in the WUS 710 may be accordingly transmitted with dropped bits. The passive wireless device 706 may accordingly detect the dropped bits (e.g., by detecting a lack of transmission in a slot) and mark the corresponding bit as “unknown” or “error. ” The WUS 710 may be associated with channel coding so that the passive wireless device 706 may correctly recover the “unknown” or “error. ”

In some aspects, a WUR ID is mapped based on the available UL slots for PUSCH/PUCCH repetition. In some aspects, WUR ID or TDRA mapping to the slot may be independently configured with the UL slot mapping for PUSCH or PUCCH repetition. In some aspects, even the PUSCH/PUCCH repetition is based on available slots (e.g., available slots in the WUR frame) , the WUR ID or TDRA mapping may be based on the all the slots (e.g., all the slots in the WUR frame) . Similarly, if PUSCH/PUCCH repetition is mapped based on all the slots (e.g., all the slots in the WUR frame) , the WUR ID or TDRA mapping may be based on the available slots (e.g., available slots in the WUR frame) . In some aspects, the WUR ID or TDRA mapping may be based on either all the slots or the transmission slot for the PUSCH/PUCCH repetition. For example, FIG. 10A is a diagram 1000 illustrating example mapping of a WUR ID and slots in a WUR frame. As illustrated in FIG. 10A, in a WUR frame 1002, a slot 1004 may be not available for UL and the mapping may accordingly be based on the available UL slots. In such aspects, the passive wireless device 706 may ignore slots with no valid transmission (e.g., by detecting pulse) for WUR decoding. As shown in FIG. 10A, in some aspects, the WUR ID may be 10011.

In some aspects, the WUR frame associated with the WUS 710 may be associated with a WUR preamble. The WUR preamble may be prepended at beginning of the WUR frame for the passive wireless device 706 to determine a start of a valid WUR frame. The WUR preamble may be sequences known to the passive wireless device 706. In some aspects, the WUR preamble may be transmitted continuously to improve detection performance. In some aspects, a TDRA different from the TDRA pattern (s) mapped for carrying the WUR ID may be associated with the WUR preamble. For example, the TDRA pattern associated with the WUR preamble may be based on symbol-level OOK where a set of symbols based on a TDRA defined for muting (no transmission) . In some aspects, the WUR preamble sequence may be configured (such as 100101) , and a TDRA pattern may be configured to correspond to the preamble sequence where the UE may transmit on symbols associated with bit value ‘1’ but not symbols associated with bit value “0” . FIG. 10B is a diagram 1050 illustrating an example WUR preamble in a WUR frame. As illustrated in FIG. 10B, a WUR preamble 1052 may be prepended at beginning of the WUR frame based on a TDRA pattern. The transmissions carrying the WUR ID may follow the WUR preamble. As shown in FIG. 10B, in some aspects, the WUR ID may be 1001101 and the WUR preamble may be 100101.

FIG. 11 is a flowchart 1100 of a method of wireless communication. The method may be performed by a UE (e.g., the UE 104, the UE 702; the apparatus 1404) .

At 1102, the UE may receive a configuration associated with a TDRA for an UL transmission from a network entity, where the UL transmission may be associated with a WUS for a wireless device, where the UL transmission may be associated with a plurality of slots including a first slot and a second slot. For example, the UE 702 may receive a configuration 708 associated with a TDRA for an UL transmission from a network entity, where the UL transmission may be associated with a WUS 710 for a wireless device (e.g., 706) , where the UL transmission may be associated with a plurality of slots including a first slot and a second slot. In some aspects, 1102 may be performed by BC component 198.

At 1104, the UE may transmit the WUS to the wireless device, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in the first slot of a plurality of slots or a second burst transmission associated with a second TDRA in the second slot of the plurality of slots. For example, the UE 702 may transmit the WUS 710 to the wireless device, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in the first slot of a plurality of slots or a second burst transmission associated with a second TDRA in the second slot of the plurality of slots. In some aspects, 1104 may be performed by BC component 198. “Burst transmission” may refer to a transmission with a time duration less than a slot.

FIG. 12 is a flowchart 1200 of a method of wireless communication. The method may be performed by a UE (e.g., the UE 104, the UE 702; the apparatus 1404) .

At 1202, the UE may receive a configuration associated with a TDRA for an UL transmission from a network entity, where the UL transmission may be associated with a WUS for a wireless device, where the UL transmission may be associated with a plurality of slots including a first slot and a second slot. For example, the UE 702 may receive a configuration 708 associated with a TDRA for an UL transmission from a network entity, where the UL transmission may be associated with a WUS 710 for a wireless device (e.g., 706) , where the UL transmission may be associated with a plurality of slots including a first slot and a second slot. In some aspects, 1202 may be performed by BC component 198. In some aspects, the configuration associated with the TDRA for the UL transmission may be received in DCI or an RRC message.

At 1204, the UE may transmit the WUS to the wireless device, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in the first slot of a plurality of slots or a second burst transmission associated with a second TDRA in the second slot of the plurality of slots. The TDRA in 1202 may include the first TDRA and the second TDRA. For example, the UE 702 may transmit the WUS 710 to the wireless device, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in the first slot of a plurality of slots or a second burst transmission associated with a second TDRA in the second slot of the plurality of slots. In some aspects, 1204 may be performed by BC component 198. In some aspects, the first TDRA may include a first position and a first width in the first slot, and the second TDRA may include a second position and a second width in the second slot. In some aspects, the first position in the first slot may be different from the second position in the second slot, and where the first width in the first slot may be different from the second width in the second slot. In some aspects, the configuration may include a sequence mapping the first TDRA to the first slot and mapping the second TDRA to the second slot. In some aspects, the sequence may be associated with a WUR ID to the wireless device (e.g., in a WUR frame, and the WUR frame may include the first slot and the second slot) . In some aspects, the configuration associated with the TDRA for the UL transmission may be included in a first DCI or a first RRC message, and where the sequence may be received via the first DCI or a second DCI, a MAC-CE, the first RRC message, or a second RRC message. In some aspects, the sequence may be received via the first DCI or the second DCI, and where the first DCI or the second DCI indicates at least two position or width associated with the first TDRA and at least two position or width associated with the second TDRA. In some aspects, the sequence may be received via the MAC-CE, the first RRC message, or the second RRC message, and where the sequence may be further associated with an activation command. In some aspects, the sequence may be received via the first DCI, the second DCI, or the MAC-CE, and where the WUR ID may be dynamic and the WUS may be transmitted via unicast. In some aspects, the sequence may be received via the first RRC message or the second RRC message, and where the WUR ID may be semi-static and the WUS may be transmitted via broadcast or groupcast. In some aspects, the WUS further indicates whether the wireless device enters a read zone associated with the UE. In some aspects, all slots (e.g., in the WUR frame) are available for TDRA mapping. In some aspects, the sequence maps a TDRA to one or more available slots in the WUR frame.

In some aspects, the WUS may be associated with a WUR frame including the first slot and the second slot, and where the WUR frame may be associated with a WUR preamble based on symbol-level on-off keying (OOK) , and where the first TDRA or the second TDRA defines no transmission in a first set of symbols and transmission in a second set of symbols, the first set of symbols or the second set of symbols being based on a sequence associated with the WUR preamble. In some aspects, the WUR preamble indicates a start of the WUR frame. In some aspects, as part of 1204, the UE may refrain from transmitting between the first burst transmission and the second burst transmission. In some aspects, the first burst transmission and the second burst transmission may be one of a PUSCH, an SRS, or a PUCCH and the one of the PUSCH, the SRS, or the PUCCH may carry data for the network entity.

In some aspects, at 1206, the UE may transmit a carrier wave (e.g., 714) to the wireless device to facilitate a BC communication for the network entity. For example, the UE 702 may transmit a carrier wave (e.g., 714) to the wireless device (e.g., 706) to facilitate a BC communication for the network entity 704. In some aspects, 1206 may be performed by the BC component 198.

FIG. 13 is a flowchart 1300 of a method of wireless communication. The method may be performed by a wireless device (e.g., passive wireless device 706, wireless device 199) .

At 1302, the wireless device may receive a WUS from a UE, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots. For example, the passive wireless device 706 may receive a WUS 710 from a UE 702, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots. In some aspects, 1302 may be performed by the wireless device 199. In some aspects, the first TDRA may include a first position and a first width in the first slot, and the second TDRA may include a second position and a second width in the second slot. In some aspects, the first position in the first slot may be different from the second position in the second slot, and where the first width in the first slot may be different from the second width in the second slot. In some aspects, the WUS may be associated with a WUR frame including the first slot and the second slot, and where the WUR frame may be associated with a WUR preamble based on symbol-level OOK, and where the first TDRA or the second TDRA defines no transmission in a first set of symbols and transmission in a second set of symbols, the first set of symbols or the second set of symbols being based on a sequence associated with the WUR preamble.

At 1304, the wireless device may transmit a communication to a network entity based on the received WUS, where the communication may be transmitted after a wake-up delay period. For example, the passive wireless device 706 may transmit a communication (based on a carrier wave 714) to a network entity based on the received WUS 710, where the communication may be transmitted after a wake-up delay period. In some aspects, 1304 may be performed by the wireless device 199. In some aspects, the communication may be a backscatter (BC) communication. In some aspects, the communication may be based on a carrier wave from the UE to facilitate the communication to the network entity.

FIG. 14 is a diagram 1400 illustrating an example of a hardware implementation for an apparatus 1404. The apparatus 1404 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus 1404 may include a cellular baseband processor 1424 (also referred to as a modem) coupled to one or more transceivers 1422 (e.g., cellular RF transceiver) . The cellular baseband processor 1424 may include on-chip memory 1424'. In some aspects, the apparatus 1404 may further include one or more subscriber identity modules (SIM) cards 1420 and an application processor 1406 coupled to a secure digital (SD) card 1408 and a screen 1410. The application processor 1406 may include on-chip memory 1406'. In some aspects, the apparatus 1404 may further include a Bluetooth module 1412, a WLAN module 1414, a satellite system module 1416 (e.g., GNSS module) , one or more sensor modules 1418 (e.g., barometric pressure sensor /altimeter; motion sensor such as inertial management unit (IMU) , gyroscope, and/or accelerometer (s) ; light detection and ranging (LIDAR) , radio assisted detection and ranging (RADAR) , sound navigation and ranging (SONAR) , magnetometer, audio and/or other technologies used for positioning) , additional memory modules 1426, a power supply 1430, and/or a camera 1432. The Bluetooth module 1412, the WLAN module 1414, and the satellite system module 1416 may include an on-chip transceiver (TRX) /receiver (RX) . The cellular baseband processor 1424 communicates through the transceiver (s) 1422 via one or more antennas 1480 with the UE 104 and/or with an RU associated with a network entity 1402. The cellular baseband processor 1424 and the application processor 1406 may each include a computer-readable medium /memory 1424', 1406', respectively. The additional memory modules 1426 may also be considered a computer-readable medium /memory. Each computer-readable medium /memory 1424', 1406', 1426 may be non-transitory. The cellular baseband processor 1424 and the application processor 1406 are each responsible for general processing, including the execution of software stored on the computer-readable medium /memory. The software, when executed by the cellular baseband processor 1424 /application processor 1406, causes the cellular baseband processor 1424 /application processor 1406 to perform the various functions described herein. The computer-readable medium /memory may also be used for storing data that is manipulated by the cellular baseband processor 1424 /application processor 1406 when executing software. The cellular baseband processor 1424 /application processor 1406 may be a component of the UE 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359. In one configuration, the apparatus 1404 may be a processor chip (modem and/or application) and include just the cellular baseband processor 1424 and/or the application processor 1406, and in another configuration, the apparatus 1404 may be the entire UE (e.g., see 350 of FIG. 3) and include the additional modules of the apparatus 1404.

As discussed herein, the BC component 198 may be configured to receive a configuration associated with a time-domain resource allocation (TDRA) for an uplink (UL) transmission from a network entity, where the UL transmission may be associated with a wake-up signal (WUS) for a wireless device 199, where the UL transmission may be associated with a plurality of slots including a first slot and a second slot. The wireless device 199 may be a passive wireless device (which may be a passive UE) . In some aspects, the BC component 198 may be further configured to transmit the WUS to the wireless device, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots. The BC component 198 may be within the cellular baseband processor 1424, the application processor 1406, or both the cellular baseband processor 1424 and the application processor 1406. The BC component 198 may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof. As shown, the apparatus 1404 may include a variety of components configured for various functions. In one configuration, the apparatus 1404, and in particular the cellular baseband processor 1424 and/or the application processor 1406, includes means for receiving a configuration associated with a TDRA for an UL transmission from a network entity, where the UL transmission may be associated with a WUS for a wireless device, where the UL transmission may be associated with a plurality of slots including a first slot and a second slot. In some aspects, the apparatus 1404 may further include means for transmitting the WUS to the wireless device, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in the first slot of a plurality of slots or a second burst transmission associated with a second TDRA in the second slot of the plurality of slots. In some aspects, the apparatus 1404 may further include means for refraining from transmitting between the first burst transmission and the second burst transmission. In some aspects, the apparatus 1404 may further include means for transmitting a carrier wave (e.g., after a wake-up delay period) to the wireless device to facilitate a backscatter (BC) communication for the network entity. The means may be the BC component 198 of the apparatus 1404 configured to perform the functions recited by the means. As described herein, the apparatus 1404 may include the TX processor 368, the RX processor 356, and the controller/processor 359. As such, in one configuration, the means may be the TX processor 368, the RX processor 356, and/or the controller/processor 359 configured to perform the functions recited by the means.

FIG. 15 is a diagram 1500 illustrating an example of a hardware implementation for a network entity 1502. The network entity 1502 may be a BS, a component of a BS, or may implement BS functionality. The network entity 1502 may include at least one of a CU 1510, a DU 1530, or an RU 1540. For example, depending on the layer functionality, the network entity 1502 may include the CU 1510; both the CU 1510 and the DU 1530; each of the CU 1510, the DU 1530, and the RU 1540; the DU 1530; both the DU 1530 and the RU 1540; or the RU 1540. The CU 1510 may include a CU processor 1512. The CU processor 1512 may include on-chip memory 1512'. In some aspects, the CU 1510 may further include additional memory modules 1514 and a communications interface 1518. The CU 1510 communicates with the DU 1530 through a midhaul link, such as an F1 interface. The DU 1530 may include a DU processor 1532. The DU processor 1532 may include on-chip memory 1532'. In some aspects, the DU 1530 may further include additional memory modules 1534 and a communications interface 1538. The DU 1530 communicates with the RU 1540 through a fronthaul link. The RU 1540 may include an RU processor 1542. The RU processor 1542 may include on-chip memory 1542'. In some aspects, the RU 1540 may further include additional memory modules 1544, one or more transceivers 1546, antennas 1580, and a communications interface 1548. The RU 1540 communicates with the UE 104. The UE 104 may facilitate backscatter communication from the wireless device 199 to the RU 1540. In some aspects, the wireless device 199 may receive a WUS from the UE 104, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots. The wireless device 199 may also transmit a communication to a network entity based on the received WUS, where the communication may be transmitted after a wake-up delay period. In some aspects, the wireless device 199 may include means for receiving a WUS from a UE, the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots. In some aspects, the wireless device 199 may also include means for transmitting a communication to a network entity based on the received WUS, where the communication may be transmitted after a wake-up delay period.

The on-chip memory 1512', 1532', 1542' and the

additional memory modules

1514, 1534, 1544 may each be considered a computer-readable medium /memory. Each computer-readable medium /memory may be non-transitory. Each of the

processors

1512, 1532, 1542 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory. The software, when executed by the corresponding processor (s) causes the processor (s) to perform the various functions described herein. The computer-readable medium /memory may also be used for storing data that is manipulated by the processor (s) when executing software.

It is understood that the specific order or hierarchy of blocks in the processes /flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes /flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not limited to the aspects described herein, but are to be accorded the full scope consistent with the language claims. Reference to an element in the singular does not mean “one and only one” unless specifically so stated, but rather “one or more. ” Terms such as “if, ” “when, ” and “while” do not imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when, ” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration. ” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. Sets should be interpreted as a set of elements where the elements number one or more. Accordingly, for a set of X, X would include one or more elements. If a first apparatus receives data from or transmits data to a second apparatus, the data may be received/transmitted directly between the first and second apparatuses, or indirectly between the first and second apparatuses through a set of apparatuses. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are encompassed by the claims. Moreover, nothing disclosed herein is dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module, ” “mechanism, ” “element, ” “device, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ”

As used in this disclosure outside of the claims, the phrase “based on” is inclusive of all interpretations and shall not be limited to any single interpretation unless specifically recited or indicated as such. For example, the phrase “based on A” (where “A” may be information, a condition, a factor, or the like) may be interpreted as: “based at least on A, ” “based in part on A, ” “based at least in part on A, ” “based only on A, ” or “based solely on A. ” Accordingly, as disclosed herein, “based on A” may, in one aspect, refer to “based at least on A. ” In another aspect, “based on A” may refer to “based in part on A. ” In another aspect, “based on A” may refer to “based at least in part on A. ” In another aspect, “based on A” may refer to “based only on A. ” In another aspect, “based on A” may refer to “based solely on A. ” In another aspect, “based on A” may refer to any combination of interpretations in the alternative. As used in the claims, the phrase “based on A” shall be interpreted as “based at least on A” unless specifically recited differently.

The following aspects are illustrative only and may be combined with other aspects or teachings described herein, without limitation.

Aspect 1 is an apparatus for communication at a user equipment (UE) , including: a memory; and at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to: receive a configuration associated with a time-domain resource allocation (TDRA) for an uplink (UL) transmission from a network entity, the UL transmission being associated with a wake-up signal (WUS) for a wireless device, the UL transmission being further associated with a plurality of slots including a first slot and a second slot; and transmit the WUS to the wireless device, the WUS including at least one of a first burst transmission associated with a first TDRA in the first slot or a second burst transmission associated with a second TDRA in the second slot.

Aspect 2 is the apparatus of aspect 1, where the configuration associated with the TDRA for the UL transmission is received in downlink control information (DCI) or a radio resource control (RRC) message.

Aspect 3 is the apparatus of aspects 1-2, where the first TDRA includes a first position and a first width in the first slot, and where the second TDRA includes a second position and a second width in the second slot.

Aspect 4 is the apparatus of aspects 1-3, where the first position in the first slot is different from the second position in the second slot, and where the first width in the first slot is different from the second width in the second slot.

Aspect 5 is the apparatus of aspect 1-4, where the configuration includes a sequence for mapping the first TDRA to the first slot and mapping the second TDRA to the second slot.

Aspect 6 is the apparatus of aspect 1-5, where the sequence is associated with a wake-up radio (WUR) identifier (ID) to the wireless device.

Aspect 7 is the apparatus of aspects 1-6, where the configuration associated with the TDRA for the UL transmission is included in a first downlink control information (DCI) or a first radio resource control (RRC) message, and where the sequence is received via the first DCI, a second DCI, a medium access control (MAC) control element (MAC-CE) , the first RRC message, or a second RRC message.

Aspect 8 is the apparatus of aspects 1-7, where the sequence is received via the first DCI or the second DCI, and where the first DCI or the second DCI indicates at least two positions or widths associated with the first TDRA and at least two positions or widths associated with the second TDRA.

Aspect 9 is the apparatus of aspects 1-8, where the sequence is received via the MAC-CE, the first RRC message, or the second RRC message, and where the sequence is further associated with an activation command.

Aspect 10 is the apparatus of aspects 1-9, where the sequence is received via the first DCI, the second DCI, or the MAC-CE, and where the WUR ID is dynamic and the WUS is transmitted via unicast.

Aspect 11 is the apparatus of aspects 1-10, where the sequence is received via the first RRC message or the second RRC message, and where the WUR ID is semi-static and the WUS is transmitted via broadcast or groupcast.

Aspect 12 is the apparatus of aspects 1-11, where the WUS further includes an indication of whether the wireless device enters a read zone of the UE.

Aspect 13 is the apparatus of aspects 1-12, where all slots are available for TDRA mapping.

Aspect 14 is the apparatus of aspects 1-13, where the sequence maps at least one TDRA to one or more available slots.

Aspect 15 is the apparatus of aspects 1-14, where the WUS is associated with a wake-up radio (WUR) frame including the first slot and the second slot, where the WUR frame is associated with a WUR preamble based on symbol-level on-off keying (OOK) , and where the first TDRA or the second TDRA defines no transmission in a first set of symbols and transmission in a second set of symbols, the first set of symbols or the second set of symbols being based on a sequence associated with the WUR preamble.

Aspect 16 is the apparatus of aspects 1-15, where the WUR preamble indicates a start of the WUR frame.

Aspect 17 is the apparatus of aspects 1-16, where the at least one processor is further configured to: refrain from transmitting between the first burst transmission and the second burst transmission.

Aspect 18 is the apparatus of aspects 1-17, where the at least one processor is further configured to: transmit a carrier wave after a wake-up delay period to the wireless device to facilitate a backscatter (BC) communication for the network entity.

Aspect 19 is the apparatus of aspects 1-18, where the first burst transmission and the second burst transmission is one of a physical uplink shared channel (PUSCH) , a sounding reference signal (SRS) , or a physical uplink control channel (PUCCH) .

Aspect 20 is the apparatus of aspects 1-19, where one of the PUSCH, the SRS, or the PUCCH carries data for the network entity.

Aspect 21 is the apparatus of aspects 1-20, further including at least one of a transceiver or an antenna coupled to the at least one processor and configured to transmit the WUS.

Aspect 22 is an apparatus for communication at a wireless device, including: a memory; and at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to: receive a wake-up signal (WUS) from a user equipment (UE) , the WUS including at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots; and transmit a first communication to a network entity based on the received WUS, the first communication being transmitted after a wake-up delay period.

Aspect 23 is the apparatus of aspects 1-22, where the first TDRA includes a first position and a first width in the first slot, and where the second TDRA includes a second position and a second width in the second slot.

Aspect 24 is the apparatus of aspects 23, where the first position in the first slot is different from the second position in the second slot, and where the first width in the first slot is different from the second width in the second slot.

Aspect 25 is the apparatus of aspects 22-24, where the first communication is a backscatter (BC) communication.

Aspect 26 is the apparatus of aspects 22-25, where the WUS is associated with a wake-up radio (WUR) frame including the first slot and the second slot, and where the WUR frame is associated with a WUR preamble based on symbol-level on-off keying (OOK) , and where the first TDRA or the second TDRA defines no transmission in a first set of symbols and transmission in a second set of symbols, the first set of symbols or the second set of symbols being based on a sequence associated with the WUR preamble.

Aspect 27 is the apparatus of aspects 22-26, where the at least one processor is further configured to: receive a carrier wave from the UE to facilitate the first communication to the network, where the first communication is transmitted based on the carrier wave.

Aspect 28 is the apparatus of aspects 22-27, further including at least one of a transceiver or an antenna coupled to the at least one processor and configured to transmit the first communication.

Aspect 29 is a method of wireless communication for implementing any of aspects 1 to 21.

Aspect 30 is an apparatus for wireless communication including means for implementing any of aspects 1 to 21.

Aspect 31 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1 to 21.

Aspect 32 is a method of wireless communication for implementing any of aspects 22 to 28.

Aspect 33 is an apparatus for wireless communication including means for implementing any of aspects 22 to 28.

Aspect 34 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 22 to 28.

Claims

An apparatus for communication at a user equipment (UE) , comprising:

a memory; and

at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to:

receive a configuration associated with a time-domain resource allocation (TDRA) for an uplink (UL) transmission from a network entity, the UL transmission being associated with a wake-up signal (WUS) for a wireless device, the UL transmission being further associated with a plurality of slots including a first slot and a second slot; and

transmit the WUS to the wireless device, the WUS comprising at least one of a first burst transmission associated with a first TDRA in the first slot or a second burst transmission associated with a second TDRA in the second slot.
The apparatus of claim 1, wherein the configuration associated with the TDRA for the UL transmission is received in downlink control information (DCI) or a radio resource control (RRC) message.
The apparatus of claim 1, wherein the first TDRA includes a first position and a first width in the first slot, and wherein the second TDRA includes a second position and a second width in the second slot.
The apparatus of claim 3, wherein the first position in the first slot is different from the second position in the second slot, and wherein the first width in the first slot is different from the second width in the second slot.
The apparatus of claim 1, wherein the configuration comprises a sequence for mapping the first TDRA to the first slot and mapping the second TDRA to the second slot.
The apparatus of claim 5, wherein the sequence is associated with a wake-up radio (WUR) identifier (ID) to the wireless device.
The apparatus of claim 6, wherein the configuration associated with the TDRA for the UL transmission is included in a first downlink control information (DCI) or a first radio resource control (RRC) message, and wherein the sequence is received via the first DCI, a second DCI, a medium access control (MAC) control element (MAC-CE) , the first RRC message, or a second RRC message.
The apparatus of claim 7, wherein the sequence is received via the first DCI or the second DCI, and wherein the first DCI or the second DCI indicates at least two positions or widths associated with the first TDRA and at least two positions or widths associated with the second TDRA.
The apparatus of claim 7, wherein the sequence is received via the MAC-CE, the first RRC message, or the second RRC message, and wherein the sequence is further associated with an activation command.
The apparatus of claim 7, wherein the sequence is received via the first DCI, the second DCI, or the MAC-CE, and wherein the WUR ID is dynamic and the WUS is transmitted via unicast.
The apparatus of claim 7, wherein the sequence is received via the first RRC message or the second RRC message, and wherein the WUR ID is semi-static and the WUS is transmitted via broadcast or groupcast.
The apparatus of claim 11, wherein the WUS further includes an indication of whether the wireless device enters a read zone of the UE.
The apparatus of claim 6, wherein all slots are available for TDRA mapping.
The apparatus of claim 6, wherein the sequence maps at least one TDRA to one or more available slots.
The apparatus of claim 1, wherein the WUS is associated with a wake-up radio (WUR) frame including the first slot and the second slot, wherein the WUR frame is associated with a WUR preamble based on symbol-level on-off keying (OOK) , and wherein the first TDRA or the second TDRA defines no transmission in a first set of symbols and transmission in a second set of symbols, the first set of symbols or the second set of symbols being based on a sequence associated with the WUR preamble.
The apparatus of claim 15, wherein the WUR preamble indicates a start of the WUR frame.
The apparatus of claim 1, wherein the at least one processor is further configured to:

refrain from transmitting between the first burst transmission and the second burst transmission.
The apparatus of claim 1, wherein the at least one processor is further configured to:

transmit a carrier wave after a wake-up delay period to the wireless device to facilitate a backscatter (BC) communication for the network entity.
The apparatus of claim 1, wherein the first burst transmission and the second burst transmission is one of a physical uplink shared channel (PUSCH) , a sounding reference signal (SRS) , or a physical uplink control channel (PUCCH) .
The apparatus of claim 19, wherein one of the PUSCH, the SRS, or the PUCCH carries data for the network entity.
The apparatus of claim 1, further comprising at least one of a transceiver or an antenna coupled to the at least one processor and configured to transmit the WUS.
An apparatus for communication at a wireless device, comprising:

a memory; and

at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to:

receive a wake-up signal (WUS) from a user equipment (UE) , the WUS comprising at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots; and

transmit a first communication to a network entity based on the received WUS, the first communication being transmitted after a wake-up delay period.
The apparatus of claim 22, wherein the first TDRA includes a first position and a first width in the first slot, and wherein the second TDRA includes a second position and a second width in the second slot.
The apparatus of claim 23, wherein the first position in the first slot is different from the second position in the second slot, and wherein the first width in the first slot is different from the second width in the second slot.
The apparatus of claim 22, wherein the first communication is a backscatter (BC) communication.
The apparatus of claim 22, wherein the WUS is associated with a wake-up radio (WUR) frame including the first slot and the second slot, wherein the WUR frame is associated with a WUR preamble based on symbol-level on-off keying (OOK) , and wherein the first TDRA or the second TDRA defines no transmission in a first set of symbols and transmission in a second set of symbols, the first set of symbols or the second set of symbols being based on a sequence associated with the WUR preamble.
The apparatus of claim 22, wherein the at least one processor is further configured to:

receive a carrier wave from the UE to facilitate the first communication to the network, wherein the first communication is transmitted based on the carrier wave.
The apparatus of claim 22, further comprising at least one of a transceiver or an antenna coupled to the at least one processor and configured to transmit the first communication.
A method for communication at a user equipment (UE) , comprising:

receiving a configuration associated with a time-domain resource allocation (TDRA) for an uplink (UL) transmission from a network entity, the UL transmission being associated with a wake-up signal (WUS) for a wireless device, the UL transmission being further associated with a plurality of slots including a first slot and a second slot; and

transmitting the WUS to the wireless device, the WUS comprising at least one of a first burst transmission associated with a first TDRA in the first slot or a second burst transmission associated with a second TDRA in the second slot.
A method for communication at a wireless device, comprising:

receive a wake-up signal (WUS) from a user equipment (UE) , the WUS comprising at least one of a first burst transmission associated with a first time-domain resource allocation (TDRA) in a first slot of a plurality of slots or a second burst transmission associated with a second TDRA in a second slot of the plurality of slots; and

transmitting a first communication to a network entity based on the received WUS, the first communication being transmitted after a wake-up delay period.