Abstract: Aspects relate to enhancing communication between network entities and ambient IoT devices using a cyclic prefix (CP) transparent on-off keying (OOK) waveform. An ambient IoT device may be configured to receive an OOK orthogonal frequency-division multiplexing (OFDM) waveform that includes a CP. The ambient IoT device may be configured to sample symbols of the received OOK OFDM waveform at a pre-defined sampling rate. The pre-defined sampling rate may be based upon a pre-defined duration of the symbols of the received OOK OFDM waveform. In particular, the pre-defined duration of each of the symbols of the received OOK OFDM waveform may be defined such that a last OOK OFDM symbol duration is set to be the same as a first OOK OFDM symbol duration, in which, the first OOK OFDM symbol includes the CP.

Abstract: This disclosure provides methods, components, devices and systems for estimating a quantity of active users for collision control in an uplink resource pool. For example, a user equipment (UE) may receive a message that allocates one or more resources for a common power signal associated with a set of UEs including at least the UE. The UE may transmit the common power signal via at least one resource of the one or more resources allocated in the message. A network entity may estimate a quantity of UEs in the set of UEs based on a power of the common power signal(s) from the set of UEs, and the network entity may transmit control signaling indicating either a resource pool for autonomous transmission of uplink data by the set of UEs or a configured grant procedure for subsequent transmissions by the set of UEs based on the estimated quantity of UEs.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a resource pool configuration for physical uplink shared channel (PUSCH) resources and sequences for modulation and coding schemes (MCSs) and payload sizes. The UE may transmit a sequence that corresponds to a selected MCS and payload size. The UE may transmit a PUSCH message using a PUSCH resource and the selected MCS and payload size. Numerous other aspects are described.

Abstract: Methods, systems, and devices for unsourced random access via channel clustering in orthogonal time frequency space domain are described. Multiple user equipments (UEs) may transmit encoded message segments according to randomly selected coding sequences from a codebook. UEs may transmit the message segments over a series of slots. A network entity may identify the coding sequences for each message segment and assign each message segment to a respective delay Doppler domain cluster based on message segments having a same or similar time delay and Doppler shift. The network entity may then identify each message by combining the messages segments of each delay Doppler domain cluster and decoding the message.

Abstract: A method for wireless communication at a wireless device and related apparatus are provided. In the method, the wireless device receives a resource indication from a reader device. The resource indication includes a plurality of resource configurations, and each resource configuration of the plurality of resource configurations includes a frequency shift and a corresponding bandwidth. The wireless device further transmits to the reader device a first message for a random access procedure with the reader device using a first resource configuration of the plurality of resource configurations. The first resource configuration is based on a received power on the wireless device or a power variation between the wireless device and a neighboring device.

Abstract: A method of connectionless uplink (CLUL) wireless communication, at a user equipment (UE) includes selecting a first resource from a first resource pool based on a backoff value corresponding to a change in channel state information (CSI). The method also includes transmitting a CSI report on the first resource, without receiving an explicit uplink grant for the first resource.

Abstract: Methods, systems, and devices for wireless communication are described. Various aspects relate generally to packet stitching for user equipment (UE) self-scheduled transmissions based on UE-provided control information. Some aspects more specifically relate to a UE transmitting different portions of a coded packet via different time-frequency resources from an uplink resource pool associated with UE self-scheduled transmissions and providing, to a network entity, control information that the network entity may use to stitch the portions of the coded packet together for joint decoding. The UE may transmit each portion of the coded packet, along with accompanying control information, within a respective unit of a set of multiple units. In some examples, to facilitate packet stitching and joint decoding at the network entity, the respective control information within each unit may at least indicate a location of that unit within an ordered sequence of the set of units.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information indicating resources for multipart uplink packet transmission. The UE may transmit a first part of an uplink packet in accordance with the configuration information, wherein the first part includes control information and a first portion of data of the uplink packet. The UE may selectively transmit a second part of the uplink packet in accordance with the configuration information, wherein the second part includes a second portion of the data of the uplink packet. Numerous other aspects are described.

Abstract: A method for wireless communication at a user equipment (UE) and related apparatus are provided. In the method, the UE receives, from a first reader device, multiple continuous wave (CW) signal sets. Each CW signal set of the multiple CW signal sets includes at least one CW signal. The UE further generates a set of reference signals corresponding to CW signals in the multiple CW signal sets, where the set of reference signals is generated based on at least one of a frequency spread or a frequency shift on the CW signals in the multiple CW signal sets. The UE further transmits, to the first reader device or a second reader device different from the first reader device, the set of reference signals corresponding to the multiple CW signal sets. The method allows for improved channel estimation while adhering to the power spectrum density (PSD) limitations.

Abstract: Methods, systems, and devices for wireless communications are described. A network node may determine channel state information (CSI) for a link with an energy harvesting (EH)-capable device based on measurements of backscattered signals reflected from the EH-capable device. The network node may include multiple antennas and may indicate, to the EH-capable device, a frequency shift to be applied by the EH-capable device to backscattering. The network node may transmit reference signals from each antenna of the network node. The EH-capable device may backscatter the received reference signals in accordance with the indicated frequency shift, and the network node may measure the frequency-shifted backscattered responses to the reference signals to determine CSI between the different antennas and the EH-capable device.

Abstract: The apparatus may be a network node configured to transmit, to a backscatter-capable device, a first indication of a first frequency range associated with a downlink (DL) transmission, a second indication of a second frequency range associated with an uplink (UL) communication from the backscatter-capable device, and a third indication of a third frequency range associated with an UL trigger from the backscatter-capable device. The apparatus may further be configured to receive, via the third frequency range, the UL trigger indicating that the backscatter-capable device has information to transmit. The apparatus may also be configured to transmit, based on receiving the UL trigger and via the first frequency range, a CW DL transmission for backscattering from the backscatter-capable device and receive, via the second frequency range, the information from the backscatter-capable device via the CW DL transmission backscattered by the backscatter-capable device.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information indicating at least one of a congestion threshold associated with a shared resource pool, or one or more backoff values associated with the shared resource pool. The UE may determine at least one of whether congestion information for the shared resource pool satisfies the congestion threshold, or a backoff value, of the one or more backoff values, associated with the congestion information. The UE may transmit, based at least in part on the determination of the at least one of whether the congestion information satisfies the congestion threshold, or the backoff value associated with the congestion information, a communication. Numerous other aspects are described.

Abstract: In some implementations, a reader receives a first message (e.g., msg1) from an ambient internet of things (A-IoT) device indicating a sequence of bits. The reader generates a second message (e.g., msg2) indicating a tag identifier (ID) including a sequence identifier associated with the sequence of bits and a sampling frequency offset (SFO) identifier associated with the with the first message. The reader transmits the second message to the device, where the tag ID is indicative of a resource allocation for the device to transmit a third message (e.g., msg3) to the reader. The tag ID is 16 bits. The reader and device are communicating in a code division multiplexing (CDM) communication system.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receiving device may receive, from a first wireless communication device on a first communication channel, a first communication that is configured with at least one guard interval (GI) sequence of a first GI type. The receiving device may receive, from the first wireless communication device or a second wireless communication device on the first communication channel or a second communication channel, a second communication that is configured with at least one GI sequence of a second GI type. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a random access response (RAR) window extension. The UE may transmit a first physical random access channel message that is based at least in part on a selected root sequence and a selected cyclic shift (CS) associated with the selected root sequence. The UE may receive, during an RAR window, a first RAR that is associated with the selected root sequence and a first CS that is different from the selected CS. The UE may perform, based at least in part on receiving the first RAR, an adjustment of the RAR window using the RAR window extension, resulting in an adjusted RAR window. The UE may communicate based at least in part on the adjusted RAR window. Numerous other aspects are described.

Abstract: Aspects of the present disclosure provide techniques for intermediate access control for self-scheduled user equipment (UE) transmissions.

Abstract: Certain aspects of the present disclosure provide techniques for backscatter communications. A method, by an apparatus (e.g., such as a reader, or a wireless communications device that is capable of wirelessly communicating with an internet-of-things (IoT) device) generally includes receiving, from a first IoT device, a first random access message; and sending, to the first IoT device, a second random access message that indicates: a first frequency shift for a transmission of a third random access message, wherein the first frequency shift is based on a first signal-to-noise ratio (SNR) associated with the first random access message; and a first bandwidth allocation for the transmission of the third random access message, wherein the first bandwidth allocation is based on the first frequency shift and the first SNR.

Abstract: The apparatus may be a wireless device configured to receive, from a network device, an indication of a plurality of preamble sequence sets for a random access procedure associated with the network device, where each preamble sequence set in the plurality of preamble sequence sets is associated with a different peak to average power ratio (PAPR) and transmit, based on one or more criteria for selecting a preamble sequence set, a random access message comprising a preamble sequence from a selected preamble sequence set of the plurality of preamble sequence sets. The apparatus may be a network device such as a base station configured to transmit, an indication of the plurality of preamble sequence sets and receive a random access message comprising a preamble sequence from a selected preamble sequence set of the plurality of preamble sequence sets.

Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device, such as a network entity, may transmit an indication (e.g., via control signaling) to a receiving device, such as a user equipment (UE), indicating that a secure downlink message is scheduled for transmission to the UE. The UE may transmit a sounding reference signal (SRS) to the network entity in response to the control signaling, and the network entity may determine a channel estimate and construct interference based on the channel estimate. The network entity may encode the secure downlink message according to an orthogonal time frequency space (OTFS) precoding scheme and may add the interference to the encoded secure downlink message over a slot duration. The network entity may transmit the encoded secure downlink message, including the added interference, to the UE. The UE may decode the encoded secure downlink message based on the OTFS precoding scheme.

Abstract: Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, a network device can transmit, to a group of passive devices, a continuous wave (CW) signal. The network device can receive, from each passive device of the group of passive devices, at least one backscatter signal, based on the CW signal, at a respective frequency shift. The network device can estimate, based on the at least one backscatter signal, channel information for each passive device of the group of passive devices. The network device can then determine, based on the channel information, a channel for transmitting an energy signal to at least one passive device of the group of passive devices for energy harvesting.