Start indicator part detection for reader-to-device signaling
Patent Information
- Application Number
- PCT/CN2025/085259
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-10-01
Smart Images

Figure CN2025085259_01102026_PF_FP_ABST
Abstract
Description
START INDICATOR PART DETECTION FOR READER-TO-DEVICE SIGNALINGTECHNICAL FIELD
[0001] This disclosure relates generally to wireless communication, and more specifically to systems, devices, methods, and techniques associated with start indicator part detection for reader-to-device signaling. DESCRIPTION OF THE RELATED TECHNOLOGY
[0002] Communication systems are deployed to provide communication services such as voice, video, packet data, messaging, or broadcast, among others. A communication system may include a wireless communication network (such as a radio access network (RAN) ) that supports communication between wireless communication devices such as network entities (such as base stations) , client devices (such as one or more user equipments (UEs) ) , and others. Such devices may communicate with one another using a variety of protocols (such as radio access technologies (RATs) ) , including those of cellular-based systems such as fourth generation (4G) systems (such as Long Term Evolution (LTE) systems) , fifth generation (5G) systems (such as 5G New Radio (5G-NR) systems) , and sixth generation (6G) systems. A wireless communication network may support communication by implementing system resources (such as frequency resources, time resources, spatial resources) in accordance with a wireless communication protocol.SUMMARY
[0003] In some examples, a wireless communication system may include one or more ambient internet-of-things (AIoT) devices. For example, an AIoT reader transmit a reader-to-device (R2D) message to an AIoT device including a preamble and a data message. The R2D preamble may include a start indicator part (SIP) , and detecting the SIP may indicate a start of the R2D message. For example, the SIP may include a first portion corresponding to an ON state and a second portion corresponding to an OFF state. In some cases, the AIoT device may receive signaling from a node outside of the topology that may interfere with ambient signaling. Accordingly, the AIoT device may be unable to detect the SIP in the ambient signaling. For example, if a first portion of the SIP is in an ON state and if the carrier waveform is in an ON state, the device may not be able to detect where the first portion of the SIP starts within the ambient signaling.
[0004] Various aspects of the present disclosure are related to SIP detection in R2D signaling. In some examples, an AIoT device may detect a start indicator part (SIP) included in ambient signaling received at the AIoT device. In some examples, an AIoT device may monitor ambient signaling for a SIP in accordance with one or more criteria. For example, the AIoT device may detect the SIP based on a duration of the ambient signaling that precedes the SIP and is associated with an amplitude that is different from a first portion of the SIP. In some other examples, the AIoT device may detect the SIP by detecting a sequence of ON and OFF periods of the ambient signaling after an amplitude transition. Additionally, or alternatively, the AIoT device may detect the SIP by detecting two amplitude transitions included in the ambient signaling that share a same direction.
[0005] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein. The following is a summary of some non-limiting aspects of the disclosure:
[0006] A method for wireless communications by a wireless device is described. The method may include monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detecting a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part, and receiving the data message based on detecting the start indicator part.
[0007] A wireless device for wireless communications is described. The wireless device may include a processing system that includes processor circuitry and memory circuitry that stores code. The processing system may be configured to cause the wireless device to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detect a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part, and receive the data message based on detecting the start indicator part.
[0008] Another wireless device for wireless communications is described. The wireless device may include means for monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, means for detecting a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part, and means for receiving the data message based on detecting the start indicator part.
[0009] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detect a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part, and receive the data message based on detecting the start indicator part.
[0010] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, the duration includes a quantity of orthogonal frequency division multiplexing (OFDM) symbols, a quantity of chips, or a quantity of bits preceding the first amplitude transition.
[0011] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, detecting the start indicator part may include operations, features, means, or instructions for detecting the start indicator part based on the duration being greater than a threshold duration.
[0012] A method for wireless communications by a wireless device is described. The method may include monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detecting a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling including, after the first amplitude transition, at least a first quantity of one or more first periods associated with a first amplitude and at least a second quantity of one or more second periods associated with a second amplitude, and receiving the data message based on detecting the start indicator part.
[0013] A wireless device for wireless communications is described. The wireless device may include a processing system that includes processor circuitry and memory circuitry that stores code. The processing system may be configured to cause the wireless device to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detect a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling including, after the first amplitude transition, at least a first quantity of one or more first periods associated with a first amplitude and at least a second quantity of one or more second periods associated with a second amplitude, and receive the data message based on detecting the start indicator part.
[0014] Another wireless device for wireless communications is described. The wireless device may include means for monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, means for detecting a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling including, after the first amplitude transition, at least a first quantity of one or more first periods associated with a first amplitude and at least a second quantity of one or more second periods associated with a second amplitude, and means for receiving the data message based on detecting the start indicator part.
[0015] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detect a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling including, after the first amplitude transition, at least a first quantity of one or more first periods associated with a first amplitude and at least a second quantity of one or more second periods associated with a second amplitude, and receive the data message based on detecting the start indicator part.
[0016] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, detecting the start indicator part may include operations, features, means, or instructions for detecting a sequence after the first amplitude transition, the sequence including one or more first periods of the ambient signaling associated with the first amplitude and one or more second periods of the ambient signaling associated with the second amplitude.
[0017] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, a first portion of the sequence may be associated with the first amplitude, and a second portion of the sequence may be associated with the second amplitude, the second portion following the first portion.
[0018] A method for wireless communications by a wireless device is described. The method may include monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detecting a start indicator part associated with a data message for the wireless device, the start indicator part including the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition, and receiving the data message based on detecting the start indicator part.
[0019] A wireless device for wireless communications is described. The wireless device may include a processing system that includes processor circuitry and memory circuitry that stores code. The processing system may be configured to cause the wireless device to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detect a start indicator part associated with a data message for the wireless device, the start indicator part including the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition, and receive the data message based on detecting the start indicator part.
[0020] Another wireless device for wireless communications is described. The wireless device may include means for monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, means for detecting a start indicator part associated with a data message for the wireless device, the start indicator part including the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition, and means for receiving the data message based on detecting the start indicator part.
[0021] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform, detect a start indicator part associated with a data message for the wireless device, the start indicator part including the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition, and receive the data message based on detecting the start indicator part.
[0022] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, the start indicator part includes a sequence of one or more first periods of the ambient signaling associated with a first amplitude and one or more second periods of the ambient signaling associated with a second amplitude.
[0023] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, the first amplitude transition indicates a beginning of the start indicator part and the second amplitude transition indicates an end of the start indicator part.BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 shows an example of a wireless communication system.
[0025] Figure 2 shows an example of a signaling configuration that supports start indicator part detection for reader-to-device signaling.
[0026] Figure 3 shows examples of communication timelines that support start indicator part detection for reader-to-device signaling.
[0027] Figure 4 shows examples of communication timelines that support start indicator part detection for reader-to-device signaling.
[0028] Figure 5 shows examples of communication timelines that support start indicator part detection for reader-to-device signaling.
[0029] Figure 6 shows an example of a process flow that supports start indicator part detection for reader-to-device signaling.
[0030] Figure 7 shows a block diagram of a processing system that supports start indicator part detection for reader-to-device signaling.
[0031] Figure 8 shows a diagram of a system including a device that supports start indicator part detection for reader-to-device signaling.
[0032] Figures 9 through 11 show flowcharts illustrating methods that support start indicator part detection for reader-to-device signaling.
[0033] Details of aspects and advantages of the subject matter in this disclosure are set forth in the drawings and accompanying descriptions. Like reference numbers and designations in the various drawings indicate like elements.DETAILED DESCRIPTION
[0034] A communication system may include a radio access network (RAN) that supports wireless communication. Communication of a RAN may be performed in accordance with one or more radio access technologies (RATs) , including 4G, 5G, or 6G, among others, including technologies not explicitly mentioned herein. A RAT may employ access technologies (such as multiplexing technologies) including code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , single-carrier FDMA (SC-FDMA) , time division synchronous code division multiple access (TD-SCDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) , among others. A RAT may support one or more service types, including machine type communication (MTC) , massive MTC (mMTC) , Internet of Things (IoT) , narrowband IoT (NB-IoT) , reduced capability (RedCap) , enhanced mobile broadband (eMBB) , ultra-reliable low-latency communication (URLLC) , or public safety, among others.
[0035] To support these and other target verticals, a communication system (such as a RAN) may be designed to implement one or more of a modularized functional infrastructure, a disaggregated and service-based network architecture, network function virtualization, network slicing, multi-access edge computing, spatial processing or multipath techniques, IoT or RedCap device connectivity and management, industrial connectivity, licensed and unlicensed spectrum access, sidelink or other device-to-device (D2D) direct communication (such as vehicle-to-everything (V2X) ) , frequency spectrum expansion, overlapping spectrum use, small cell deployments, non-terrestrial network (NTN) deployments, device aggregation, advanced duplex communication (such as sub-band full-duplex (SBFD) ) , multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, network energy savings (NES) , low-power signaling and radios, or artificial intelligence or machine learning (AI / ML) , among other examples.
[0036] The foregoing and other technological improvements may support use cases such as voice calls, messaging, data transfer, streaming, wireless data centers, extended reality (XR) and metaverse applications, vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage using non-terrestrial or aerial platforms, among other examples. As the demand for connectivity continues to increase, further improvements may be implemented, and other RATs, including 6G and beyond, may be introduced to enable new applications and use cases. The systems, methods, and devices described herein may enable one or more of the foregoing technologies or new technologies or support one or more of the foregoing use cases or new use cases.
[0037] In some examples, a wireless communication system may include one or more ambient internet-of-things (AIoT) devices. In some examples, an AIoT reader may transmit a reader-to-device (R2D) message to the AIoT device. The R2D message may include a preamble and a data message. The R2D preamble may include a start indicator part (SIP) , and detecting the SIP may indicate a start of the R2D message. For example, the SIP may include a first portion corresponding to an ON state and a second portion corresponding to an OFF state. The AIoT device may also be in communication with a node that provides the AIoT device with a carrier waveform that the AIoT device uses to backscatter signaling to communicate with the AIoT reader. In some cases, the carrier waveform may be transmitted from a node outside of a topology associated with the AIoT device. In such cases, the AIoT device cannot guarantee a state of ambient signaling at the AIoT prior to receiving the SIP. Accordingly, the AIoT device may be unable to detect the SIP based on the state of the ambient signaling. For example, if a first portion of the SIP is in an ON state and if the carrier waveform is in an ON state, the carrier waveform may interfere with the SIP, and the AIoT device may not be able to detect where the first portion of the SIP starts within the ambient signaling.
[0038] Various aspects of the present disclosure are related to SIP detection in R2D signaling. In some examples, an AIoT device may monitor ambient signaling for a SIP in accordance with one or more criteria. In some examples, the AIoT device may detect the SIP based on a portion of the ambient signaling that precedes the SIP. The portion of the ambient signaling may be associated with an amplitude that is different from an amplitude of a first portion of the SIP. For example, if the first portion of the SIP corresponds to an ON state, the portion of the ambient signaling may correspond to an OFF state for a duration. In some other examples, the AIoT device may detect the SIP by detecting a threshold quantity of ON periods of the ambient signaling and a quantity of OFF periods of the ambient signaling after an amplitude shift. In some cases, the AIoT device may monitor for a sequence (e.g., pattern) of ON and OFF periods of the ambient signaling corresponding to the SIP. Additionally, or alternatively, the AIoT device may detect the SIP by detecting two amplitude transitions that move in a same direction. For example, the AIoT device may detect a first amplitude transition associated with a first direction (e.g., ON to OFF) . The AIoT device may detect the SIP after detecting a second amplitude transition also associated with the first direction.
[0039] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, by detecting the SIP in accordance with one or more criteria, the described techniques can be used to more reliably detect received SIP in cases where the AIoT device receives signaling from a node that is outside a topology of the AIoT device. Specifically, detecting the SIP in accordance with the one or more criteria may provide more explicit guidance for detecting the SIP, leading to faster and more accurate identification of the SIP within ambient signaling received at the AIoT device. Additionally, described techniques may support more reliable SIP detection regardless of signaling from nodes that are outside the topology.
[0040] Figure 1 shows an example of a wireless communication system 100. The wireless communication system 100 includes a core network 150 and a RAN 120 that support communication with one or more devices, such as UEs 115. A RAN 120 may include one or more network entities 105 configured to support wireless communication with the UEs 115.
[0041] The wireless communication system 100 may support communication among network entities 105 and UEs 115 in accordance with a layered protocol stack. For example, in a user plane, communication at a bearer layer, a Packet Data Convergence Protocol (PDCP) layer, or Service Data Adaption Protocol (SDAP) layer may be Internet Protocol (IP) -based. A Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate via logical channels. A Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. A MAC layer also may implement error detection techniques, error correction techniques, or retransmissions. In a control plane, a Radio Resource Control (RRC) layer may provide establishment, configuration, and maintenance of an RRC connection between UEs 115 and a network entity 105 or a core network 150, supporting radio bearers for user plane data. A Physical (PHY) layer may map transport channels to physical channels.
[0042] A core network 150 may support user authentication, access authorization, tracking, IP connectivity, and other access, routing, or mobility functions (such as via network entities 105) . A core network 150 may be a 5G core (5GC) or 6G core (6GC) , and may include at least one control plane entity that manages access and mobility and at least one user plane entity that routes packets or interconnects to external networks (such as a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , a user plane function (UPF) ) .
[0043] A network entity 105 may support wireless communication in accordance with one or more coverage areas 110, and may be referred to as a network element, a network node, a RAN node, or network equipment, among other nomenclature. One or more of the network entities 105 may include or may be referred to as a base station. Depending on its capabilities, a base station may be referred to as a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a 6G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology. The wireless communication system 100 may include a heterogeneous network in which different types of network entities 105 support communication for one or more coverage areas 110 using the same or different RATs.
[0044] In some examples, a network entity 105 may be implemented in an aggregated (such as monolithic, standalone) architecture, which may utilize a protocol stack that is physically or logically integrated within one network entity 105 (such as a single physical RAN node) . In some other examples, a network entity 105 may be implemented in a disaggregated architecture, which may utilize a protocol stack that is physically or logically distributed among multiple network entities 105, including in an integrated access and backhaul (IAB) network, an open RAN (O-RAN) , or a virtualized RAN (vRAN) . In a disaggregated architecture, a network entity 105 may include or be referred to as one or more of a central unit (CU) (such as CU 160) , a distributed unit (DU) (such as DU 165) , a radio unit (RU) (such as RU 170) , or a combination thereof. The wireless communication system 100 may also implement a service-based architecture that provides a modular framework in which control plane functionality and common data repositories may be delivered through a set of interconnected network functions (NFs) that may access services of other NFs.
[0045] UEs 115 may be located in a coverage area 110 of one or more network entities 105, and may include or be referred to as an access terminal, a mobile station, a client device, or a subscriber unit. A UE 115 may be, include, or be coupled with a cellular phone, a wireless modem, a tablet device, a laptop computer, a wireless local loop (WLL) station, a camera, a medical or biometric device, a wearable device, a gaming device, an entertainment device, an XR device, a vehicular component or sensor, a smart meter or sensor, industrial manufacturing equipment, a Global Positioning System (GPS) or other positioning device, a robot or other device implementing artificial intelligence, a UE function of a network node, or any other wireless communication device or function that may communicate using a wireless medium.
[0046] The wireless communication system 100 may support various types of communication links among devices. For example, wireless communication between a network entity 105 and a UE 115 may be supported using one or more of a communication link 125 (such as a Uu interface) , which may include downlink communication from a network entity 105 to a UE 115, uplink communication from a UE 115 to a network entity 105, or both. Direct wireless communication between UEs 115 may be supported using a communication link 135 (such as a device-to-device (D2D) communication link, a sidelink, a PC5 interface) .
[0047] Communication between a network entity 105 and a core network 150 may be supported using a backhaul link 132 (such as an S1, N2, N3, NG, or other interface) . In some implementations, communication between network entities 105 may be supported using a backhaul link 132 (such as an X2, Xn, or other interface) either directly (such as directly between network entities 105) or indirectly (such as via a core network 150) . In some implementations (such as in a disaggregated architecture) , communication between a CU 160 and a DU 165 may be supported using a midhaul link 162, and communication between a DU 165 and an RU may be supported using a fronthaul link 168. A backhaul link 132, a midhaul link 162, a fronthaul link 168, or any combination thereof may be or include one or more wired links (such as an electrical link, an optical fiber link) or one or more wireless links (such as a radio link, a wireless optical link) , among other examples or combinations thereof. Wireless backhaul, midhaul, or fronthaul may be implemented via one or more IAB nodes 104, which may act as a relay using resources of an IAB donor network entity 105 (such as via a wireless link 130) .
[0048] The wireless communication system 100 may include one or more of a relay 172 that may steer or reflect signals transmitted by other entities, which may support any of the described communication links. A relay 172 may include active elements or passive elements, and may be in the form of a reconfigurable intelligent surface (RIS) . An RIS may include tunable reflecting antenna arrays or metasurfaces, which may be used to enhance coverage or efficiency in multipath environments.
[0049] Network entities 105 and UEs 115 each may include one or multiple antennas. Multiple antennas of such devices may be used to employ techniques such as transmit diversity, receive diversity, MIMO communication, or beamforming, and may be organized or structured as one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays, among other examples. As used herein, the term “antenna” may refer to one or more antennas, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays. The term “antenna panel” may refer to a group of antennas (such as antenna elements) arranged in an array or panel, which may facilitate beamforming by manipulating parameters associated with the group of antennas. In some implementations, an antenna panel may support RF beamforming for a signal transmitted or received via an antenna port. The term “antenna module” may refer to circuitry including one or more antennas as well as one or more other components (such as filters, amplifiers, processors, beamformers) associated with integrating the antenna module into a device such as a network entity 105 or a UE 115.
[0050] Beamforming, such as directional transmission or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (such as at a network entity 105, at a UE 115) to shape or steer a beam 175 (such as an antenna beam, a transmit beam, a receive beam) along a spatial path (such as along a direction) , which may include one or more paths between a transmitting device and a receiving device. Beamforming may be achieved by combining signals communicated via multiple antenna elements of an antenna array such that signals propagating along some orientations (such as relative to the antenna array) experience constructive interference while others may experience destructive interference. Adjustments of signals communicated via the antenna elements may include a transmitting device or a receiving device applying phase offsets, amplitude offsets, or other adjustments to signals carried via (such as transmitted by, received by) antenna elements of the device, which may be defined by a beamforming weight set associated with a particular orientation (such as relative to the antenna array of the device) .
[0051] Communication resources of the wireless communication system 100 (such as of a RAN 120) may refer to a resource in the frequency domain (such as a frequency resource, an RF resource) , a resource in the time domain (such as a time resource) , a resource in the spatial domain (such as a spatial resource, a spatial layer) , or a combination thereof. The wireless communication system 100 may leverage orthogonality of such resources to convey different communications to or from different devices (such as for a communication link 125, for a communication link 135, for unicast communication, for multicast communication, for broadcast communication) .
[0052] A frequency resource may refer to a frequency or range of frequencies (such as a bandwidth, a frequency channel) of a frequency band implemented for wireless communication. For example, a frequency resource may refer to a resource of a lower frequency band (such as Frequency Range 1 (FR1) , between 425 MHz and 7.125 GHz) , a mid-band (such as Frequency Range 3 (FR3) , between 7.125 GHz and 24.25 GHz) , or an upper frequency band (such as Frequency Range 2 (FR2) , between 24.25 GHz and 71 GHz) . Communication in the upper frequency band may be referred to as millimeter wave (mmW) communication, and communication above an upper frequency band (such as between mmW and THz frequencies, between 100 GHz and 1 THz) may be referred to as sub-Terahertz (sub-THz) communication.
[0053] A frequency resource may refer to a “carrier” (such as a frequency channel) , or portion thereof, and a carrier bandwidth may be referred to as a “system bandwidth. ” A carrier may be subdivided in the frequency domain, including into subcarriers, bandwidth parts (BWPs) , or both. For example, a resource block (RB) , such as a physical resource block (PRB) , may be defined in accordance with a set of subcarriers (such as twelve consecutive subcarriers in the frequency domain) , and a BWP may be configured in accordance with a set of RBs (such as a set of contiguous RBs) .
[0054] A frequency resource may be configured to carry either downlink communication or uplink communication (such as in a frequency division duplexing (FDD) configuration) , or may be configured to carry both downlink and uplink communication (such as in a time division duplexing (TDD) configuration, in a sub-band full duplex (SBFD) configuration) . One or more numerologies for a carrier may be supported, each associated with a subcarrier spacing (SCS) and a cyclic prefix (CP) . Supported numerologies may vary by frequency range (such as FR1, FR2, FR3) , and a carrier may be divided into portions (such as BWPs) having the same or different numerologies. BWPs may be configured as uplink BWPs or downlink BWPs (such as by a network entity 105) , including in response to network conditions (such as to allocate uplink and downlink BWPs in response to traffic conditions) , device capability (such as allocating BWPs with a greater quantity of RBs to UEs 115 with relatively higher capabilities) , or both. A UE 115 may be configured with a set of multiple BWPs (such as a set of uplink BWPs, a set of downlink BWPs, or both) , and a single BWP of a set (such as an active UL BWP, an active DL BWP, or both) may be active at a given time, such that communication of a UE 115 is supported by active BWP (s) .
[0055] A time resource may refer to a duration of a frame (such as a radio frame, a frame structure) , or portion thereof. For example, a frame may span a duration of 10 ms, and each frame may be identified by a system frame number (SFN) . A frame may be subdivided in the time domain, including into subframes, slots, mini-slots, or a combination thereof. Slots or mini-slots may each include a respective quantity of symbols (such as symbol durations, symbol periods, OFDM symbols) , which may be a function of a configured CP. A duration of a symbol is a function of the SCS or frequency band of operation.
[0056] A spatial resource may refer to an antenna, an antenna direction, an antenna port, a signal direction (such as a beamforming direction) , or other resource that supports spatial orthogonality. A device (such as a network entity 105, a UE 115) may perform communications of a given frequency resource and time resource with a single spatial resource (such as communication without regard to spatial orthogonality) . Additionally, or alternatively, a device may implement multiple spatial resources to support multiple signal streams using resources that are overlapping in the time and frequency domains (such as to support MIMO techniques) .
[0057] Signals of the wireless communication system 100 (such as of a RAN 120) may be communicated using one or more resource elements (REs) , and an RE may refer to a resource that corresponds to one subcarrier in the frequency domain and one symbol in the time domain. An RE may be used to convey a modulation symbol corresponding to one or more bits of information (such as of a physical channel, of a reference signal) in accordance with a modulation scheme. For example, a quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM) technique may be implemented to communicate one or more bits that are distinguished in accordance with phase components, amplitude components, or both of a signal conveyed using a RE. A quantity of bits carried by an RE may depend on an order of the modulation scheme, and a relatively higher order may correspond to a relatively higher rate of communication. A device may support communication of REs using multiple subcarriers concurrently by implementing multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) , among others.
[0058] Physical channels may carry information using modulation symbols conveyed by corresponding REs. Physical shared channels (such as for communicating user data) may include a physical downlink shared channel (PDSCH) for communicating user data in a downlink direction and a physical uplink shared channel (PUSCH) for communicating user data in an uplink direction. Physical control channels (such as for managing communication via physical channels) may include a physical downlink control channel (PDCCH) for communicating downlink control information (DCI) and a physical uplink control channel (PUCCH) for communicating uplink control information (UCI) . A network entity 105 may indicate (such as schedule, allocate) communication resources for a UE 115 using DCI, including indicating downlink resources of a PDSCH (such as in accordance with a downlink grant) , uplink resources of a PUSCH (such as in accordance with an uplink grant) , or a combination thereof. A control region (such as a control resource set (CORESET) ) for a physical control channel may be configured in accordance with a pattern of REs in the time and frequency domains, and one or more control regions may be configured for a set of UEs. A UE 115 may monitor control regions for control information according to one or more search space sets, which may include a common search space set (such as for sending control information to one or more UEs 115) , UE-specific search space sets (such as for sending control information to a UE 115) , or a combination thereof. A physical broadcast channel (PBCH) may be used to broadcast parameters to UEs 115 to synchronize with a network entity 105 and establish communications (such as to establish a communication link 125) .
[0059] Reference signals may be communicated to establish reference characteristics (such as a frequency reference, a temporal reference, a spatial reference, a signal quality reference) between devices of a RAN 120, which may support communication using physical channels. Reference signals communicated between network entities 105 and UEs 115 may include synchronization signals (such as a primary synchronization signal (PSS) , a secondary synchronization signal (SSS) ) that support temporal synchronization, channel state information-reference signals (CSI-RSs) that support evaluating downlink channel characteristics, sounding reference signals (SRSs) that support evaluating uplink channel characteristics, demodulation reference signals (DMRSs) that support demodulation, or phase tracking reference signals (PTRSs) for evaluating oscillator characteristics, among others. Network entities 105 and UEs 115 may receive and measure transmitted reference signals to support one or more of these and other functions.
[0060] Devices of the wireless communication system 100 may be configured to support one or more aspects of the described techniques for start indicator part detection for reader-to-device signaling. For example, a UE 115 may include a processing system 140, and a network entity 105 may include a processing system 145, each of which may be configured to cause the respective device to perform (such as being configured as means for performing) one or more of the described operations. By configuring a processing system 140, a processing system 145, or a combination thereof in accordance with the described techniques, the communication system 100 (such as the RAN 120) may support techniques for detecting SIP in cases where an AIoT device receives signaling from a node that is outside a topology of the AIoT device. Specifically, detecting the SIP in accordance with the one or more criteria may allow the AIoT device to more reliably detect SIP included in ambient signaling received at the AIoT device regardless of signaling from nodes that are outside the topology.
[0061] Figure 2 shows an example of a signaling configuration 200 that supports start indicator part detection for reader-to-device signaling. The signaling configuration 200 may include an AIoT device 205, an AIoT reader 210, and a carrier waveform node 215. In the example of FIG. 2, the AIoT device 205 may be a UE 115 or a network entity 105 as described with reference to FIG. 1. Similarly, the AIoT reader 210 and the carrier waveform node 215 may be UEs 115 or network entities 105 as described with reference to FIG. 1.
[0062] The AIoT device 205 may communicate with the AIoT reader 210 and the carrier waveform node 215. For example, the AIoT device 205 may transmit device-to-reader (D2R) signaling 220 to the AIoT reader 210 and may receive R2D signaling 225 from the AIoT reader 210. In some examples, the AIoT reader 210 may communicate data to the AIoT device 205 via the R2D signaling 225. For example, the R2D signaling 225 may carry a data message in a physical reader-to-device channel (PRDCH) 230. The R2D signaling 225 may also include an R2D preamble 235 such that the AIoT device 205 may detect and receive the R2D signaling 225 (e.g., the data message) . Similarly, the AIoT device may receive a carrier waveform 250 from the carrier waveform node 215. In some cases, the carrier waveform 250 may include a continuous waveform. The AIoT device 205 may use the carrier waveform 250 to communicate the D2R signaling 225 with the AIoT reader 210. For example, the AIoT device 205 may be a low-power device and may backscatter the carrier waveform 250 to communicate the D2R signaling 225.
[0063] The R2D preamble 235 may further include an SIP 240 and a clock acquisition part (CAP) 245 for the AIoT device 205 to use to receive the R2D signaling 225. For example, the AIoT device 205 may detect a SIP 240 included in signaling from the AIoT reader 210 and may receive and decode the CAP 245 after detecting the SIP 240. The AIoT device 205 may receive the PRDCH using the CAP 245 (e.g., information included in the CAP 245) . The SIP 240 may be a waveform that includes at least one ON period and at least one OFF period. For example, a first portion of the SIP 240 may correspond to an ON state (e.g., a portion having a first amplitude corresponding to an ON state of the waveform that includes the SIP 240) and a second portion of the SIP 240 may correspond to an OFF state (e.g., a portion having a second amplitude corresponding to an OFF state of the waveform that includes the SIP 240) . The second portion of the SIP 240 may follow the first portion of the SIP 240.
[0064] The AIoT device 205 may monitor ambient signaling for the SIP in order to receive corresponding PRDCH via R2D signaling 225. For example, the AIoT device 205 may receive (e.g., simultaneously) both the R2D signaling 225 and the carrier waveform 250 via ambient signaling. In some examples, the AIoT device 205 may detect the SIP 240 based on detecting the first portion of the SIP 240 (e.g., based on detecting a change in amplitude corresponding to the first portion of the SIP 240) . In some examples, the first portion and the second portion of the SIP 240 may follow a pattern (e.g., an ON-OFF pattern, an OFF-ON pattern) .
[0065] Conversely, a first portion of the SIP 240 may correspond to an OFF state (e.g., a portion having the second amplitude corresponding to the OFF state of the waveform that includes the SIP 240) and a second portion of the SIP 240 may correspond to an ON state (e.g., a portion having the first amplitude corresponding to the OFF state of the waveform that includes the SIP 240) . In some examples, the SIP 240 may include additional portions (not shown) that correspond to either the ON state or the OFF state. For example, the SIP 240 may further include a third portion that corresponds to the first portion of the SIP 240. That is, a third amplitude for the third portion may correspond to the ON state if the first portion is associated with the ON state or may correspond to the OFF state if the first portion is associated with the OFF state. The third portion of the SIP may follow both the first portion and the second portion of the SIP 240. In some examples, the first portion, the second portion, and the third portion of the SIP 240 may follow a pattern (e.g., an ON-OFF-ON pattern, an OFF-ON-OFF pattern) .
[0066] The AIoT reader 210 may be associated with a topology. In some cases, the AIoT reader 210 may be configured to communicate with both the AIoT device 205 and the carrier waveform node 215. For example, the AIoT reader 210 and the carrier waveform node 215 may be the same node. In such cases, the carrier waveform node 215 may be inside the topology associated with the AIoT reader 210. In another example, the AIoT reader 210 may be split into two nodes, a transmitter reader node and a receiver reader node. In such cases, the transmitter reader node may transmit R2D signaling 225 to the AIoT device 205 and the receiver reader node may receive D2R signaling 220 from the AIoT device 205. The transmitter reader node and the carrier waveform node 215 may be the same node.
[0067] In the example of FIG. 2, the AIoT reader 210 may be configured to communicate with the AIoT device 205 but may not be configured to communicate with the carrier waveform node 215 in accordance with the topology. In such cases, the carrier waveform node 215 may be outside of the topology associated with the AIoT reader 210. Because the carrier waveform node 215 is not in communications with the AIoT reader 210, the AIoT reader 210 may be unable to coordinate transmissions (e.g., R2D signaling 225) with the carrier waveform node 215. In such cases, the AIoT device 205 may be unable to detect an SIP 240 transmitted by the AIoT reader 210. For example, when monitoring ambient signaling for the R2D preamble 235, the reader may simultaneously receive both the R2D preamble 235 (e.g., the SIP 240) and the carrier waveform 250 via the ambient signaling. If the carrier waveform 250 is transmitted at an amplitude that matches the first portion of the SIP 240, the AIoT device 205 may be unable to determine where the carrier waveform 250 ends and where the SIP 240 begins.
[0068] For example, if the SIP 240 begins with in an ON period (e.g., with a first period corresponding to an ON state) and if the carrier waveform 250 is currently in an ON state, the AIOT device may be unable to detect a first amplitude change indicating a start of the SIP 240. Conversely, if the SIP 240 begins with in an OFF period (e.g., with a first period corresponding to an OFF state) and if the carrier waveform 250 is currently in an OFF state, the AIOT device may be unable to detect a first amplitude change indicating a start of the SIP 240. Additionally, or alternatively, in some examples the AIoT reader 210 may be in communication with multiple additional AIoT devices 205 (not shown) . In such examples, the AIoT reader 210 may finish transmissions with a first AIoT device 205 and may initiate another R2D transmission with a second AIoT device 205.
[0069] Various aspects of the present disclosure are related to detecting an SIP 240 for R2D signaling 225. In accordance with various embodiments described herein with reference to Figures 3, 4, and 5, the AIoT device 205 may monitor for and detect SIPs 240 that are received via ambient signaling. The AIoT device 205 may detect the SIPs 240 in accordance with one or more criteria (e.g., constraints) . In some examples, the AIoT device 205 may detect an SIP 240 in accordance with one or more criteria associated with signaling preceding the SIP 240. Such embodiments are described in additional detail herein with reference to Figure 3. In some other examples, the AIoT device 205 may detect an SIP 240 in accordance with one or more criteria for determining a portion (e.g., section) of the ambient signaling that corresponds to the SIP 240. Such embodiments are described in additional detail herein with reference to Figure 4. Additionally, or alternatively, the AIoT device 205 may detect an SIP 240 in accordance with one or more criteria associated with the SIP 240. Such embodiments are described in additional detail herein with reference to Figure 5.
[0070] Figure 3 shows an example of a communication timeline 300-a and a communication timeline 300-b that support start indicator part detection for reader-to-device signaling. The communication timeline 300-a and the communication timeline 300-b may illustrate communications occurring at an AIoT device (not shown) , which may receive signaling from multiple other devices, including an AIoT reader (not shown) and a carrier waveform node (not shown) . The AIoT device, the AIoT reader, and the carrier waveform node may be an example of similar devices described herein, including the AIoT device 205, the AIoT reader 210, and the carrier waveform node 215, as discussed with reference to Figure 2. The AIoT device may monitor ambient signaling in accordance with the communication timeline 300-a or the communication timeline 300-b. In some examples, the AIoT device may receive signaling from multiple other devices, including the AIoT reader and the carrier waveform node. For example, the AIoT device may receive a carrier waveform 305 (e.g., a radio transmission) from the carrier waveform node via the ambient signaling. The AIoT device may also receive an SIP 310 from the AIoT reader via the ambient signaling.
[0071] As discussed herein with reference to Figure 2, the SIP 310 may be a waveform that includes at least one ON period and at least one OFF period. For example, with reference to the communication timeline 300-a, a first portion 315-a of the SIP 310-a may correspond to an ON period (e.g., a first amplitude corresponding to an ON state) and a second portion 320-a of the SIP 310-a may correspond to an OFF period (e.g., a second amplitude corresponding to an OFF state) . That is, the SIP 310-a may start with an ON period and may end with an OFF period. Conversely, with reference to the communication timeline 300-b, a first portion 315-b of the SIP 310-b may correspond to an OFF period (e.g., a first amplitude corresponding to an OFF state) and a second portion 320-b of the SIP 310-b may correspond to an ON period (e.g., a second amplitude corresponding to an ON state) . That is, the SIP 310-b may start with an OFF period and may end with an ON period. Although the SIPs 310 are depicted as only having a first portion 315 and a second portion 320, it should be understood that in some other examples, the SIPs 310 may include additional portions (not shown) .
[0072] The AIoT device may monitor ambient signaling to detect the SIP 310 in order to receive a corresponding PRDCH from the AIoT reader. For example, the AIoT device may receive both the carrier waveform 305 and the SIP 310 via the ambient signaling. In some examples, the AIoT device may detect the SIP 310 based on detecting the first portion 315 of the SIP 310. To accomplish this, the AIoT device may evaluate one or more criteria associated with ambient signaling that precedes the SIP 310. For example, to determine that the ambient signaling includes the SIP 310, the AIoT device may determine that one or more criteria associated with the ambient signaling prior to the SIP 310 are satisfied.
[0073] In an example, the AIoT device may determine that a portion 325 of the ambient signaling that precedes the SIP 310 satisfies one or more criteria. The portion 325 of the ambient signaling may have an amplitude that is different from (e.g., opposite to) the first amplitude associated with the first portion 315 of the SIP 310. In the example of the communication timeline 300-a, because the first portion 315-a of the SIP 310-a is associated with an ON state, the portion 325-a of the ambient signaling may be associated with an OFF state. In the example of the communication timeline 300-b, because the first portion 315-b of the SIP 310-b is associated with an OFF state, the portion 325-b of the ambient signaling may be associated with an ON state.
[0074] The one or more criteria may include a duration associated with the portion 325 of the ambient signaling. In some cases, the AIoT device may detect the SIP 310 based on the portion 325 of the ambient signaling including the portion 325 of the ambient signaling occupying a threshold quantity of OFDM symbols, chips, bits, or any combination thereof. For example, the threshold quantity of OFDM symbols may be an integer value (e.g., 1) . Additionally, or alternatively, the AIoT device may detect the SIP 310 based on the portion 325 of the ambient signaling including the portion 325 of the ambient signaling satisfying (e.g., exceeding) a threshold duration.
[0075] In the example of the communication timeline 300-a, the AIoT device may detect that the ambient signaling includes the SIP 310-a based on the portion 325-a of the ambient signaling being associated with an OFF state for a duration. In such examples, the start of the SIP 310-a that follows the portion 325-a of the ambient signaling may be associated with an ON state. In the example of the communication timeline 300-b, the AIoT device may detect that the ambient signaling includes the SIP 310-b based on the portion 325-b of the ambient signaling being associated with an ON state for a duration. In such examples, the start of the SIP 310-b that follows the portion 325-b of the ambient signaling may be associated with an OFF state.
[0076] By monitoring for and detecting the SIP 310 in accordance with one or more criteria for the ambient signaling preceding the SIP 310, the AIoT device may achieve more reliable detection of the SIP 310. For example, by ensuring that the ambient signaling includes a period with an amplitude opposite to the start of the SIP 310 for a duration, the AIoT device may ensure that the ambient signaling includes an amplitude transition prior to the SIP 310 such that the AIoT device may detect the amplitude change that indicates the start of the SIP 310.
[0077] Figure 4 shows an example of a communication timeline 400-a and a communication timeline 400-b that supports start indicator part detection for reader-to-device signaling. The communication timeline 400-a and the communication timeline 400-b may illustrate communications occurring at an AIoT device (not shown) , which may receive signaling from multiple other devices, including an AIoT reader (not shown) and a carrier waveform node (not shown) . The AIoT device, the AIoT reader, and the carrier waveform node may be an example of similar devices described herein, including the AIoT device 205, the AIoT reader 210, and the carrier waveform node 215, as discussed with reference to Figure 2. The AIoT device may monitor ambient signaling in accordance with the communication timeline 400-a or the communication timeline 400-b. In some examples, the AIoT device may receive signaling from multiple other devices, including the AIoT reader and the carrier waveform node. For example, the AIoT device may receive a carrier waveform 405 (e.g., a radio transmission) from the carrier waveform node via the ambient signaling. The AIoT device may also receive an SIP 410 from the AIoT reader via the ambient signaling.
[0078] The AIoT device may monitor the ambient signaling to detect the SIP 410 in order to receive a corresponding PRDCH from the AIoT reader. For example, the AIoT device may receive both the carrier waveform 405 and the SIP 410 via the ambient signaling. As discussed herein with reference to Figure 2, the SIP 410 may be a waveform that includes at least one ON period and at least one OFF period. Although the SIPs 410 are depicted as only having a first portion 415 and a second portion 420, it should be understood that in some other examples, the SIPs 410 may include additional portions (not shown) . In some examples, the AIoT device may detect the SIP 410 based on evaluating one or more criteria for determining whether a portion 430 of the ambient signaling that follows a amplitude transition 425 (e.g., level transition) corresponds to the SIP 410. For example, to determine that the ambient signaling includes the SIP 410, the AIoT device may determine that one or more criteria associated with the portion 430 of the ambient signaling after the amplitude transition 425 is satisfied.
[0079] In some examples, the AIoT device may determine that the portion 430 of the ambient signaling includes the SIP 410 in accordance with a pattern (e.g., a sequence of ON states and OFF states) associated with the SIP 410. In the example of FIG. 4, the SIP 410 may be configured with a pattern of ON-OFF, where the first portion 415 of the SIP corresponds to an ON state and the second portion of the SIP corresponds to an OFF state. In some other examples not illustrated herein, the SIP 410 may be configured with other patterns, including an OFF-ON pattern, an ON-OFF-ON pattern, or an OFF-ON-OFF pattern as discussed with reference to FIG. 2. In some cases, the pattern may be applied to both cases where the ambient signaling is in an ON state prior to the SIP 410 and cases where the ambient signaling is in an OFF state prior to the SIP 410.
[0080] After detecting the amplitude transition 425, the AIoT device may monitor the portion 430 of the ambient signaling for the pattern associated with the SIP. For example, with reference to the communication timeline 400-a, the AIoT device may detect the amplitude transition 425 and may begin monitoring the portion 430-a of the ambient signaling for the pattern (e.g., an ON-OFF pattern) . The direction of the amplitude transition 425 may vary based on a state of the ambient signaling (e.g., the carrier waveform 405) . With reference to the communication timeline 400-a, the direction of the amplitude transition 425-a may be an ON-OFF level transition. The AIoT device may monitor the portion 430-a for an ON period followed by an OFF period. For example, the AIoT device may detect the SIP 410-a based on detecting the first portion 415-a followed by the second portion 420-a. The AIoT device may determine that the SIP 410-a does not include a third portion 435 of the ambient signaling based on the pattern. For example, because the pattern associated with the SIP 410 does not begin with an OFF state, the AIoT device may determine that the third portion 435 of the ambient signaling is not a start of the SIP 410.
[0081] Similarly, with reference to the communication timeline 400-b, the AIoT device may detect the amplitude transition 425 and may begin monitoring the portion 430-b of the ambient signaling for the pattern (e.g., an ON-OFF pattern) . With reference to the communication timeline 400-b, the direction of the amplitude transition 425-a may be an OFF-ON level transition. The AIoT device may monitor the portion 430-b for an ON period followed by an OFF period. For example, the AIoT device may detect the SIP 410-b based on detecting the first portion 415-b followed by the second portion 420-b.
[0082] In some other examples, the AIoT device may determine that the portion 430 of the ambient signaling includes the SIP 410 in accordance with threshold quantities of ON states and OFF states associated with in the SIP 410. For example, the SIP 410 may be configured to include a quantity of ON states (e.g., one) and a quantity of OFF states (e.g., one) included in the SIP after the amplitude transition 425. In the example of Figure 4, the SIP 410 may be configured to include one ON state and one OFF state. Accordingly, the AIoT device may identify the SIP 410 within the ambient signaling based on detecting the threshold quantities of ON states and OFF states associated with the SIP 410. For example, with reference to the communication timeline 400-a, the AIoT device may determine that the ambient signaling includes the SIP 410. However, in such examples, the AIoT device may determine that the SIP 410 included in the ambient signaling spans (e.g., includes) the third portion 435 and the first portion 415-a (e.g., the SIP 410-c) instead of the first portion 415-a and the second portion 420-a (e.g., the SIP 410-a) because the AIoT device does not consider a pattern when evaluating the ambient signaling for the SIP 410.
[0083] By monitoring for and detecting the SIP 410 in accordance with one or more criteria for determining whether the portion 430 of the ambient signaling that follows an amplitude transition 425 corresponds to the SIP 410, the AIoT device may achieve more reliable detection of the SIP 410. For example, by ensuring that the ambient signaling includes a sequence of ON and OFF periods or a quantity of ON and OFF periods corresponding to the SIP 410, the AIoT device may ensure that the ambient signaling includes the SIP 410.
[0084] Figure 5 shows an example of a communication timeline 500-a and a communication timeline 500-b that supports start indicator part detection for reader-to-device signaling. The communication timeline 500-a and the communication timeline 500-b may illustrate communications occurring at an AIoT device (not shown) , which may receive signaling from multiple other devices, including an AIoT reader (not shown) and a carrier waveform node (not shown) . The AIoT device, the AIoT reader, and the carrier waveform node may be an example of similar devices described herein, including the AIoT device 205, the AIoT reader 210, and the carrier waveform node 215, as discussed with reference to Figure 2. The AIoT device may monitor ambient signaling in accordance with the communication timeline 500-a or the communication timeline 500-b. In some examples, the AIoT device may receive signaling from multiple other devices, including the AIoT reader and the carrier waveform node. For example, the AIoT device may receive a carrier waveform 505 (e.g., a radio transmission) from the carrier waveform node via the ambient signaling. The AIoT device may also receive an SIP 510 from the AIoT reader via the ambient signaling.
[0085] The AIoT device may monitor the ambient signaling to detect the SIP 510 in order to receive a corresponding PRDCH from the AIoT reader. For example, the AIoT device may receive both the carrier waveform 505 and the SIP 510 via the ambient signaling. As discussed herein with reference to Figure 2, the SIP 510 may be a waveform that includes at least one ON period and at least one OFF period. The ambient signaling may include a first amplitude transition 515, a second amplitude transition 520, a third amplitude transition 525, and a fourth amplitude transition 530. In the example of Figure 5, the first amplitude transition 515 and the third amplitude transition 525 share a direction, and the second amplitude transition 520 and the fourth amplitude transition 530 share a direction. For example, with reference to the communication timeline 500-a, the first amplitude transition 515-a and the third amplitude transition 525-a may be an ON-OFF level transition and the second amplitude transition 520-a and the fourth amplitude transition 530-a may be an OFF-ON level transition. Alternatively, with reference to the communication timeline 500-b, the first amplitude transition 515-b and the third amplitude transition 525-b may be an ON-OFF level transition and the second amplitude transition 520-b and the fourth amplitude transition 530-b may be an OFF-ON level transition.
[0086] In some examples, the AIoT device may detect the SIP 510 based on evaluating one or more criteria associated with the SIP 510. For example, to determine that the ambient signaling includes the SIP 510, the AIoT device may determine that one or more criteria associated with the SIP 510 is satisfied. In some examples, the one or more criteria associated with the SIP 510 may include a quantity of matching level transitions. For example, the SIP 510 may be defined by at least two level transitions (e.g., a starting transition and an ending transition) that share a direction. In some examples, the sequence of ON states and OFF states included in the SIP 510 (e.g., between the starting transition and the ending transition) may correspond to one or more of the patterns described herein with reference to Figures 2 and 4.
[0087] For example, with reference to the communication timeline 500-a, if the level transition is an ON-OFF level transition, the SIP 510-a may be defined by the first amplitude transition 515-a and the third amplitude transition 525-a. Alternatively, if the level transition is an OFF-ON level transition, the SIP 510-a may be defined by the second amplitude transition 520-a and the fourth amplitude transition 530-a. In another example, with reference to the communication timeline 500-b, if the level transition is an OFF-ON level transition, the SIP 510-b may be defined by the first amplitude transition 515-b and the third amplitude transition 525-b. Alternatively, if the level transition is an ON-OFF level transition, the SIP 510-b may be defined by the second amplitude transition 520-b and the fourth amplitude transition 530-b.
[0088] By monitoring for and detecting the SIP 510 in accordance with one or more criteria for the SIP 510, the AIoT device may achieve more reliable detection of the SIP 510. For example, by ensuring that the SIP 510 is defined by a starting transition and an ending transition that share a same direction, the AIoT device may more reliably detect the SIP 510 in ambient signaling received by the AIoT device.
[0089] Figure 6 shows an example of a process flow 600 that supports start indicator part detection for reader-to-device signaling. The process flow 600 may implement or be implemented by aspects of the wireless communications system 100, the signaling configuration 200, one or more of the communication timelines 300, 400, and 500 as described with reference to Figures 1 through 5, or any combination thereof. For example, the process flow 600 illustrates actions performed by a wireless device 605 and a wireless reader 610, which may be examples of corresponding devices described herein, including with reference to Figures 1 through 5. For example, the wireless device 605 and the wireless reader 610 may be examples of an AIoT device 205 or an AIoT reader 210 as described with reference to Figure 2. In the following description of the process flow 600, the operations between the wireless device 605 and the wireless reader 610 may be performed in a different order than the example shown, or the operations between the wireless device 605 and the wireless reader 610 may be performed in different orders at different times. Some operations may also be omitted from the process flow 600, and other operations may be added to the process flow 600.
[0090] At 615, the wireless device 605 may monitor ambient signaling for a first amplitude transition. In some examples, the wireless device 605 may be configured to communicate based on backscattering of a carrier waveform. The wireless device 605 may be an example of an AIoT device.
[0091] At 620, the wireless device 605 may detect a start indicator part associated with a data message for the wireless device 605.
[0092] In some examples, the wireless device 605 may detect the start indicator part based on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part. The duration may include a quantity of OFDM symbols, a quantity of chips, or a quantity of bits preceding the first amplitude transition. Additionally or alternatively, the wireless device 605 may detect the start indicator part based on the duration being greater than a threshold duration. In some examples, the first amplitude may be associated with an OFF state and the second amplitude may be associated with an ON state. In some other examples, the first amplitude may be associated with an ON state and the second amplitude may be associated with an OFF state.
[0093] In some examples, the wireless device 605 may detect the start indicator part based on the ambient signaling including, after the first amplitude transition, at least a first quantity of one or more first periods associated with the first amplitude and at least a second quantity of one or more second periods associated with the second amplitude. In some cases, to detect the start indicator part, the wireless device 605 may detect a sequence after the first amplitude transition, the sequence including one or more first periods of the ambient signaling associated with the first amplitude and one or more second periods of the ambient signaling associated with the second amplitude. In some examples, a first portion of the sequence may be associated with the first amplitude, and a second portion of the sequence may be associated with the second amplitude, the second portion following the first portion. Additionally, a third portion of the sequence may be associated with the first amplitude, the third portion following the first portion and the second portion.
[0094] In some examples, the wireless device 605 may detect the start indicator part based on the ambient signaling including the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition. For example, the start indicator part may include a sequence of one or more first periods of the ambient signaling associated with a first amplitude and one or more second periods of the ambient signaling associated with a second amplitude. In such examples, the first amplitude transition may indicate a beginning of the start indicator part, and the second amplitude transition may indicate an end of the start indicator part. The first amplitude transition and the second amplitude transition may include a change from an ON state to an OFF state. Alternatively, the first amplitude transition and the second amplitude transition may include a change from an OFF state to an ON state. In some cases, the start indicator part may further include a third amplitude transition in between the first amplitude transition and the second amplitude transition, the third amplitude transition having a different direction than the first amplitude transition and the second amplitude transition.
[0095] At 625, the wireless device 605 may receive the data message based at least in part on detecting the start indicator part. In some cases, the start indicator part may be included in a preamble associated with the data message, where the data message is an R2D message.
[0096] Figure 7 shows an example of a processing system 720 that supports start indicator part detection for reader-to-device signaling. A processing system 720 may be an example of a processing system 140 (such as of an wireless device) and may include an ambient signaling component 725, a detecting component 730, a data message component 735, or any combination thereof. A processing system 720, or various component thereof, may be an example of means for performing (such as a means for causing a wireless device to perform) various techniques described herein.
[0097] The ambient signaling component 725 may be configured to cause the wireless device to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform. The detecting component 730 may be configured to cause the wireless device to detect a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part. The data message component 735 may be configured to cause the wireless device to receive the data message based on detecting the start indicator part.
[0098] In some examples, the duration includes a quantity of OFDM symbols, a quantity of chips, or a quantity of bits preceding the first amplitude transition.
[0099] In some examples, to support detecting the start indicator part, the detecting component 730 may be configured to cause the wireless device to detect the start indicator part based on the duration being greater than a threshold duration.
[0100] In some examples, the first amplitude is associated with an OFF state. In some examples, the second amplitude is associated with an ON state.
[0101] In some examples, the first amplitude is associated with an ON state. In some examples, the second amplitude is associated with an OFF state.
[0102] In some examples, the wireless device includes an AIoT device.
[0103] In some examples, the start indicator part is included in a preamble associated with the data message. In some examples, the data message includes a R2D message.
[0104] Additionally or alternatively, in some examples, the ambient signaling component 725 may be configured to cause the wireless device to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform. In some examples, the detecting component 730 may be configured to cause the wireless device to detect a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling including, after the first amplitude transition, at least a first quantity of one or more first periods associated with a first amplitude and at least a second quantity of one or more second periods associated with a second amplitude. In some examples, the data message component 735 may be configured to cause the wireless device to receive the data message based on detecting the start indicator part.
[0105] In some examples, to support detecting the start indicator part, the detecting component 730 may be configured to cause the wireless device to detect a sequence after the first amplitude transition, the sequence including one or more first periods of the ambient signaling associated with the first amplitude and one or more second periods of the ambient signaling associated with the second amplitude.
[0106] In some examples, a first portion of the sequence is associated with the first amplitude, and a second portion of the sequence is associated with the second amplitude, the second portion following the first portion.
[0107] In some examples, a third portion of the sequence is associated with the first amplitude, the third portion following the first portion and the second portion.
[0108] In some examples, the first amplitude is associated with an ON state. In some examples, the second amplitude is associated with an OFF state.
[0109] In some examples, the wireless device includes an AIoT device.
[0110] Additionally or alternatively, in some examples, the ambient signaling component 725 may be configured to cause the wireless device to monitor ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform. In some examples, the detecting component 730 may be configured to cause the wireless device to detect a start indicator part associated with a data message for the wireless device, the start indicator part including the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition. In some examples, the data message component 735 may be configured to cause the wireless device to receive the data message based on detecting the start indicator part.
[0111] In some examples, the start indicator part includes a sequence of one or more first periods of the ambient signaling associated with a first amplitude and one or more second periods of the ambient signaling associated with a second amplitude.
[0112] In some examples, the first amplitude transition indicates a beginning of the start indicator part. In some examples, the second amplitude transition indicates an end of the start indicator part.
[0113] In some examples, the start indicator part further includes a third amplitude transition in between the first amplitude transition and the second amplitude transition, the third amplitude transition having a different direction than the first amplitude transition and the second amplitude transition.
[0114] In some examples, the first amplitude transition and the second amplitude transition include a change from an ON state to an OFF state.
[0115] In some examples, the first amplitude transition and the second amplitude transition include a change from an OFF state to an ON state.
[0116] In some examples, the wireless device includes an AIoT device.
[0117] A processing system 720 may include or be a component of one or more chips, systems-on-chips (SoCs) , chipsets, packages, components, or devices that individually or collectively constitute or include a processing system. A processing system 720 may interface with other components of a processing system 720. For example, operations described with reference to a processing system 720, or various components thereof, may be performed by or with other such components, including a receiver, a transmitter, a transceiver, a modem, a user interface, a modulator / demodulator, an encoder / decoder, or any combination thereof (such as of the processing system 720, coupled with the processing system 720, of a processing system 720) .
[0118] By including or configuring a processing system 720 for operation in a processing system 720 as described herein, the processing system 720 may support techniques for reduced power consumption and more efficient utilization of communication resources.
[0119] Figure 8 shows an example of a system 800 including a device 805 that supports start indicator part detection for reader-to-device signaling. The device 805 may be an example of or include components of a wireless device. The device 805 may communicate (such as wirelessly) with one or more other devices (such as network entities 105, UEs 115) . The device 805 may include components for transmitting and receiving communication, which may include a processing system 820, an input / output (I / O) controller, such as an I / O controller 810, a transceiver 815, antenna (s) 825, a memory 830, and a processor 840. Components of the device 805 may be coupled (such as operatively, communicatively, functionally, electronically, electrically, in electronic communication) a bus 855.
[0120] The transceiver 815 may support bi-directional communication via antenna (s) 825, and may support transmission operations, reception operations, or both, as described herein. The transceiver 815 may implement functionality of a modem (such as a wireless modem) and may include one or more RF chains. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , and other components that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for digital processing at the device 805) . The transceiver 815 may modulate symbols and provide the modulated symbols to antenna (s) 825 for transmission, and demodulate symbols from signals received using antenna (s) 825.
[0121] The processor 840 may be a general-purpose processing component that supports various operations (such as applications) of the device 805. The memory 830 may be a general-purpose storage component that stores code executable by the processor 840. Such code may include instructions that, when executed by the processor 840, cause the device 805 to perform various functions (such as to support an application of the device 805) . The I / O controller 810 may manage inputs and outputs for the device 805, may manage peripherals not integrated into the device 805, or may represent a physical connection (such as port) to an external peripheral. The processor 840 may interact with a modem, a keyboard, a mouse, a touchscreen, or other device (such as via I / O controller 810) . In some implementations, a user may interact with the device 805 via the I / O controller 810 or via hardware components controlled by the I / O controller 810.
[0122] The processing system 820 may be an example of a processing system 140 or a processing system 700. For example, the processing system 820 may include processor circuitry 845 and memory circuitry 850 that stores code, and may be configured to cause the device 805 to perform operations that support start indicator part detection for reader-to-device signaling. Although the processing system 820 is illustrated as a separate component, which may involve a separate chip, chipset, or other module, in some implementations, one or more functions described with reference to the processing system 820 may be supported by or performed by a transceiver 815, antenna (s) 825, a processor 840, memory 830, or any combination thereof, such that a processing system 820 may include one or more of a transceiver 815, antenna (s) 825, a processor 840, memory 830, or any combination thereof.
[0123] By including or configuring the processing system 820 for operation in the device 805 as described herein, may support techniques for reduced latency and improved user experience related to reduced processing, more efficient utilization of communication resources, and improved coordination between devices.
[0124] Figure 9 shows an example of a method 900 that supports start indicator part detection for reader-to-device signaling. Operations of the method 900 may be performed by a wireless device or its components (such as using a processing system configured to cause the wireless device to perform one or more of the operations) as described herein.
[0125] At 905, the method may include monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform. In some examples, aspects of the operations of 905 may be performed by an ambient signaling component 725.
[0126] At 910, the method may include detecting a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part. In some examples, aspects of the operations of 910 may be performed by a detecting component 730.
[0127] At 915, the method may include receiving the data message based on detecting the start indicator part. In some examples, aspects of the operations of 915 may be performed by a data message component 735.
[0128] Figure 10 shows an example of a method 1000 that supports start indicator part detection for reader-to-device signaling. Operations of the method 1000 may be performed by a wireless device or its components (such as using a processing system configured to cause the wireless device to perform one or more of the operations) as described herein.
[0129] At 1005, the method may include monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform. In some examples, aspects of the operations of 1005 may be performed by an ambient signaling component 725.
[0130] At 1010, the method may include detecting a start indicator part associated with a data message for the wireless device, where detecting the start indicator part is based on the ambient signaling including, after the first amplitude transition, at least a first quantity of one or more first periods associated with a first amplitude and at least a second quantity of one or more second periods associated with a second amplitude. In some examples, aspects of the operations of 1010 may be performed by a detecting component 730.
[0131] At 1015, the method may include receiving the data message based on detecting the start indicator part. In some examples, aspects of the operations of 1015 may be performed by a data message component 735.
[0132] Figure 11 shows an example of a method 1100 that supports start indicator part detection for reader-to-device signaling. Operations of the method 1100 may be performed by a wireless device or its components (such as using a processing system configured to cause the wireless device to perform one or more of the operations) as described herein.
[0133] At 1105, the method may include monitoring ambient signaling for a first amplitude transition, where the wireless device is configured to communicate based on backscattering of a carrier waveform. In some examples, aspects of the operations of 1105 may be performed by an ambient signaling component 725.
[0134] At 1110, the method may include detecting a start indicator part associated with a data message for the wireless device, the start indicator part including the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition. In some examples, aspects of the operations of 1110 may be performed by a detecting component 730.
[0135] At 1115, the method may include receiving the data message based on detecting the start indicator part. In some examples, aspects of the operations of 1115 may be performed by a data message component 735.
[0136] Implementation examples are described in the following numbered clauses:
[0137] Aspect 1: A method for wireless communications at a wireless device, comprising: monitoring ambient signaling for a first amplitude transition, wherein the wireless device is configured to communicate based at least in part on backscattering of a carrier waveform; detecting a start indicator part associated with a data message for the wireless device, wherein detecting the start indicator part is based at least in part on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part; and receiving the data message based at least in part on detecting the start indicator part.
[0138] Aspect 2: The method of aspect 1, wherein the duration comprises a quantity of orthogonal frequency division multiplexing (OFDM) symbols, a quantity of chips, or a quantity of bits preceding the first amplitude transition.
[0139] Aspect 3: The method of any of aspects 1 through 2, wherein detecting the start indicator part comprises: detecting the start indicator part based at least in part on the duration being greater than a threshold duration.
[0140] Aspect 4: The method of any of aspects 1 through 3, wherein the first amplitude is associated with an OFF state, and the second amplitude is associated with an ON state.
[0141] Aspect 5: The method of any of aspects 1 through 4, wherein the first amplitude is associated with an ON state, and the second amplitude is associated with an OFF state.
[0142] Aspect 6: The method of any of aspects 1 through 5, wherein the wireless device comprises an ambient internet of things (AIoT) device.
[0143] Aspect 7: The method of any of aspects 1 through 6, wherein the start indicator part is included in a preamble associated with the data message, and the data message comprises a reader-to-device (R2D) message.
[0144] Aspect 8: A method for wireless communications at a wireless device, comprising: monitoring ambient signaling for a first amplitude transition, wherein the wireless device is configured to communicate based at least in part on backscattering of a carrier waveform; detecting a start indicator part associated with a data message for the wireless device, wherein detecting the start indicator part is based at least in part on the ambient signaling comprising, after the first amplitude transition, at least a first quantity of one or more first periods associated with a first amplitude and at least a second quantity of one or more second periods associated with a second amplitude; and receiving the data message based at least in part on detecting the start indicator part.
[0145] Aspect 9: The method of aspect 8, wherein detecting the start indicator part comprises: detecting a sequence after the first amplitude transition, the sequence comprising one or more first periods of the ambient signaling associated with the first amplitude and one or more second periods of the ambient signaling associated with the second amplitude.
[0146] Aspect 10: The method of aspect 9, wherein a first portion of the sequence is associated with the first amplitude, and a second portion of the sequence is associated with the second amplitude, the second portion following the first portion.
[0147] Aspect 11: The method of aspect 10, wherein a third portion of the sequence is associated with the first amplitude, the third portion following the first portion and the second portion.
[0148] Aspect 12: The method of any of aspects 8 through 11, wherein the first amplitude is associated with an ON state, and the second amplitude is associated with an OFF state.
[0149] Aspect 13: The method of any of aspects 8 through 12, wherein the wireless device comprises an ambient internet of things (AIoT) device.
[0150] Aspect 14: A method for wireless communications at a wireless device, comprising: monitoring ambient signaling for a first amplitude transition, wherein the wireless device is configured to communicate based at least in part on backscattering of a carrier waveform; detecting a start indicator part associated with a data message for the wireless device, the start indicator part comprising the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition; and receiving the data message based at least in part on detecting the start indicator part.
[0151] Aspect 15: The method of aspect 14, wherein the start indicator part comprises a sequence of one or more first periods of the ambient signaling associated with a first amplitude and one or more second periods of the ambient signaling associated with a second amplitude.
[0152] Aspect 16: The method of any of aspects 14 through 15, wherein the first amplitude transition indicates a beginning of the start indicator part, and the second amplitude transition indicates an end of the start indicator part.
[0153] Aspect 17: The method of any of aspects 14 through 16, wherein the start indicator part further comprises a third amplitude transition in between the first amplitude transition and the second amplitude transition, the third amplitude transition having a different direction than the first amplitude transition and the second amplitude transition.
[0154] Aspect 18: The method of any of aspects 14 through 17, wherein the first amplitude transition and the second amplitude transition comprise a change from an ON state to an OFF state.
[0155] Aspect 19: The method of any of aspects 14 through 18, wherein the first amplitude transition and the second amplitude transition comprise a change from an OFF state to an ON state.
[0156] Aspect 20: The method of any of aspects 14 through 19, wherein the wireless device comprises an ambient internet of things (AIoT) device.
[0157] Aspect 21: A wireless device for wireless communications, comprising a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the wireless device to perform a method of any of aspects 1 through 7.
[0158] Aspect 22: A wireless device for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 7.
[0159] Aspect 23: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 7.
[0160] Aspect 24: A wireless device for wireless communications, comprising a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the wireless device to perform a method of any of aspects 8 through 13.
[0161] Aspect 25: A wireless device for wireless communications, comprising at least one means for performing a method of any of aspects 8 through 13.
[0162] Aspect 26: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 8 through 13.
[0163] Aspect 27: A wireless device for wireless communications, comprising a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the wireless device to perform a method of any of aspects 14 through 20.
[0164] Aspect 28: A wireless device for wireless communications, comprising at least one means for performing a method of any of aspects 14 through 20.
[0165] Aspect 29: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 14 through 20.
[0166] It should be noted that methods described herein describe possible implementations. Other implementations in accordance with the described techniques are possible, including implementations in which operations are rearranged or otherwise modified relative to the described methods. Further, aspects from two or more of the described methods may be combined.
[0167] Although aspects of 5G or 6G systems may be described for purposes of example and corresponding terminology may be used in the description, the techniques described herein are applicable beyond 5G, or 6G networks. For example, the described techniques may be applicable to other communication systems such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.20, Flash-OFDM, or other systems and radio technologies not explicitly mentioned herein.
[0168] As used herein, a processing system (such as a processing system 140, a processing system 145) includes processor (or “processing” ) circuitry in the form of one or multiple processors, microprocessors, processing units (such as central processing units (CPUs) , graphics processing units (GPUs) , neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , or digital signal processors (DSPs) ) , processing blocks, application-specific integrated circuits (ASICs) , programmable logic devices (PLDs) , or other discrete gate or transistor logic or circuitry (any one or more of which may be generally referred to herein individually as a “processor” or collectively as “the processor” or “the processor circuitry” ) . Such processors may be individually or collectively configurable or configured to perform functions or operations described herein. A group of processors collectively configurable or configured to cause a device to perform a set of functions may include a first processor configured to cause the device to perform a first function of the set and a second processor configured to cause the device to perform a second function of the set. In some other examples, each of a group of processors may be configured to cause a device to perform a same set of functions.
[0169] As used herein, a processing system (such as a processing system 140, a processing system 145) also includes memory circuitry in the form of one or multiple memory devices, memory blocks, memory elements, or other discrete gate or transistor logic or circuitry, each of which may include or implement tangible storage media such as random-access memory (RAM) or read-only memory (ROM) , or combinations thereof (any one or more of which may be generally referred to herein individually as a “memory” or collectively as “the memory” or “the memory circuitry” ) . One or more of the memories may be coupled (such as operatively, communicatively, electronically, electrically) with one or more processors of the processor circuitry and may individually or collectively store processor-executable code or instructions (such as software) that, when executed by one or more of the processors, may cause a device (such as configure the device, using one or more of the processors) to perform functions or operations described herein. Additionally, or alternatively, in some examples, one or more of the processors may be configured to cause a device to perform functions or operations described herein without requiring configuration by software. As used herein, “software” shall be construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
[0170] As used herein, a processing system (such as a processing system 140, a processing system 145) may include or be coupled with one or more modems (such as a cellular modem, a 5G-compliant modem, a 6G-compliant modem) . In some examples, one or more processors of a processing system may include or implement one or more of the modems. A processing system also may include or be coupled with multiple radios (collectively “the radio” ) , multiple RF chains, or multiple transceivers, each of which may in turn be coupled with one or more of multiple antennas. In some examples, one or more processors of a processing system may include or implement one or more of the radios, RF chains, or transceivers. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by processor circuitry) .
[0171] As described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code (such as processor-executable code, instructions) stored in memory circuitry (such as a non-transitory computer-readable medium, of the memory circuitry, storing code for wireless communication that is executable by a processing system) or otherwise, to perform one or more of the functions described herein.
[0172] As used herein, the term “determine” or “determining” can encompass one or more of a variety of actions. For example, “determining” can include one or more of calculating, computing, processing, deriving, detecting, estimating, looking up, inferring, ascertaining, measuring, resolving, selecting, obtaining, identifying, interpreting, demodulating, decoding, reading, establishing, forming, or generating, among other examples. In some such examples, determining can involve a processing system performing some type of calculating, computing, deriving, estimating, inferring, ascertaining, resolving, predicting, or other processing to obtain one or more numerical values, sets, elements, or other information or results. In some such examples, determining can involve a processing system identifying, looking up, investigating or otherwise obtaining some type of value, set, element, or other information or result from a table, data structure, database, or an implementation of memory, such as from a larger set of values, sets, or elements or other information or results. In some such examples, determining can involve a processing system identifying, interpreting, demodulating, decoding, detecting, reading, or otherwise obtaining some type of value, set, element, or other information or result signaled in, for example, a received wireless signal. In some such examples, determining can involve a processing system performing a measurement, such as on a received signal.
[0173] As used herein, the phrase “associated with” is intended to be interpreted in the inclusive sense, unless otherwise explicitly indicated. For example, the phrase “associated with” is not to be construed as a reference to a closed set of conditions, factors, criteria, elements, components, or actions, among other examples. Specifically, unless a phrase refers to “associated with only ‘a, ’ ” or the equivalent in context, whatever it is that is “associated with ‘a, ’ ” may be associated with “a” alone or associated with a combination of “a” and one or more other conditions, factors, criteria, elements, components or actions, among other examples. The phrase “associated with” may be interpreted to mean or be interchanged with “in association with, ” “in accordance with, ” “based on, ” “based at least in part on, ” “as a function of, ” “in response to, ” “responsive to, ” “using, ” “coupled with, ” in communication with, ” “configured with, ” “included with, ” or “in cooperation with, ” as appropriate in the relevant context unless otherwise explicitly indicated. Additionally, the use of such phrases does not indicate that what follows the phrase is the focal point or primary factor associated with the limitation preceding the phrase.
[0174] As used herein, a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members. For example, “at least one of: a, b, or c” is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c. Additionally, as used herein, a phrase referring to “a” or “an” element refers to one or more of such elements acting individually or collectively to perform the recited function (s) . Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For instance, for a claim that refers to “a” component performing one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components, and subsequent reference to a component introduced with the article “a” using the term “the” may refer to any or all of the single or multiple components. Thus, a component introduced with the article “a” may be understood to mean “one or more” components, and referring to “the” component subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more” components. Additionally, as used herein, a “set” can refer to one or more items, and a “subset” can refer to a whole set or less than the whole set, but not an empty set. Additionally, as used herein, the term “or” is intended to be interpreted in the inclusive sense, such as when referring to a series, and may be used interchangeably with the term “and / or, ” unless otherwise explicitly indicated (for example, if used in conjunction with “either” or “only one of” ) . For example, “a or b” may include a only, b only, or a combination of a and b.
[0175] The disclosure is provided to enable a person having ordinary skill in the art to implement the described techniques. Modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the techniques disclosed herein may be applied with other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A wireless device, comprising:a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the wireless device to:monitor ambient signaling for a first amplitude transition, wherein the wireless device is configured to communicate based at least in part on backscattering of a carrier waveform;detect a start indicator part associated with a data message for the wireless device, wherein the processing system is configured to cause the wireless device to detect the start indicator part based at least in part on the ambient signaling having a first amplitude for at least a duration prior to the first amplitude transition, the first amplitude different from a second amplitude associated with a first portion of the start indicator part; andreceive the data message based at least in part on detecting the start indicator part.2.The wireless device of claim 1, wherein the duration comprises a quantity of orthogonal frequency division multiplexing (OFDM) symbols, a quantity of chips, or a quantity of bits preceding the first amplitude transition.3.The wireless device of claim 1, wherein the processing system is configured to cause the wireless device to detect the start indicator part based at least in part on the duration being greater than a threshold duration.4.The wireless device of claim 1, wherein:the first amplitude is associated with an OFF state, andthe second amplitude is associated with an ON state.5.The wireless device of claim 1, wherein:the first amplitude is associated with an ON state, andthe second amplitude is associated with an OFF state.6.The wireless device of claim 1, wherein the wireless device comprises an ambient internet of things (AIoT) device.7.The wireless device of claim 1, wherein:the start indicator part is included in a preamble associated with the data message, andthe data message comprises a reader-to-device (R2D) message.8.A wireless device, comprising:a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the wireless device to:monitor ambient signaling for a first amplitude transition, wherein the wireless device is configured to communicate based at least in part on backscattering of a carrier waveform;detect a start indicator part associated with a data message for the wireless device, wherein the processing system is configured to cause the wireless device to detect the start indicator part based at least in part on the ambient signaling comprising, after the first amplitude transition, at least a first quantity of one or more first periods associated with a first amplitude and at least a second quantity of one or more second periods associated with a second amplitude; andreceive the data message based at least in part on detecting the start indicator part.9.The wireless device of claim 8, wherein, to detect the start indicator part, the processing system is configured to cause the wireless device to:detect a sequence after the first amplitude transition, the sequence comprising one or more first periods of the ambient signaling associated with the first amplitude and one or more second periods of the ambient signaling associated with the second amplitude.10.The wireless device of claim 9, wherein a first portion of the sequence is associated with the first amplitude, and wherein a second portion of the sequence is associated with the second amplitude, the second portion following the first portion.11.The wireless device of claim 10, wherein a third portion of the sequence is associated with the first amplitude, the third portion following the first portion and the second portion.12.The wireless device of claim 8, wherein:the first amplitude is associated with an ON state, andthe second amplitude is associated with an OFF state.13.The wireless device of claim 8, wherein the wireless device comprises an ambient internet of things (AIoT) device.14.A wireless device, comprising:a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the wireless device to:monitor ambient signaling for a first amplitude transition, wherein the wireless device is configured to communicate based at least in part on backscattering of a carrier waveform;detect a start indicator part associated with a data message for the wireless device, the start indicator part comprising the first amplitude transition and at least a second amplitude transition having a same direction as the first amplitude transition; andreceive the data message based at least in part on detecting the start indicator part.15.The wireless device of claim 14, wherein the start indicator part comprises a sequence of one or more first periods of the ambient signaling associated with a first amplitude and one or more second periods of the ambient signaling associated with a second amplitude.16.The wireless device of claim 14, wherein:the first amplitude transition indicates a beginning of the start indicator part, andthe second amplitude transition indicates an end of the start indicator part.17.The wireless device of claim 14, wherein the start indicator part further comprises a third amplitude transition in between the first amplitude transition and the second amplitude transition, the third amplitude transition having a different direction than the first amplitude transition and the second amplitude transition.18.The wireless device of claim 14, wherein the first amplitude transition and the second amplitude transition comprise a change from an ON state to an OFF state.19.The wireless device of claim 14, wherein the first amplitude transition and the second amplitude transition comprise a change from an OFF state to an ON state.20.The wireless device of claim 14, wherein the wireless device comprises an ambient internet of things (AIoT) device.