Abstract: Methods, systems, and devices for wireless communications are described. An energy transmitter device may transmit an energy signal to an energy receiver device for energy harvesting by the energy receiver device. To communicate channel state information (CSI) of a channel between the energy transmitter device and the energy receiver device, the energy transmitter device may transmit a first signal to the energy receiver device. In response, the energy receiver device may transmit a second signal to the energy transmitter device that is indicative of the CSI, where the CSI is based on the first signal. The energy transmitter device may transmit additional signals to the energy receiver device whose transmission characteristics are based on the CSI.

Abstract: Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for efficiently performing and reporting reference signal received power (RSRP) measurements. In particular, the techniques described herein may allow a user equipment (UE) to efficiently identify reference signals on which to perform RSRP measurements (e.g., based on signaling from a base station), identify when to report RSRP measurements (e.g., aperiodically, periodically, or semi-persistently), and identify a channel on which to report RSRP measurements (e.g., a sidelink channel or an uplink channel). In addition, the techniques described herein may also allow a UE to efficiently identify open loop parameters to use to determine an appropriate transmit power for transmitting to another UE over a sidelink.

Abstract: Methods, systems, and devices for wireless communications are described. Generally, a user equipment (UE) may transmit feedback signaling for received sidelink messages to both the base station and the transmitting UE. The receiving UE may multicast a feedback message to both the base station and the transmitting UE on a physical uplink control channel (PUCCH) or on a physical sidelink feedback channel (PSFCH). The base station may configure the receiving UE with resources, the transmitting UE may allocate resources to the receiving UE, or the base station may actively monitor for the feedback message. In some examples, the receiving UE may operate in a dual connectivity mode, and may transmit the feedback message to both the base station and the transmitting UE on both the PUCCH and the PSFCH.

Abstract: Certain aspects of the present disclosure provide techniques for multi-carrier on-off keying communications. A method for wireless communications by an apparatus includes receiving a signal comprising multiple carrier frequencies modulated with on-off keying; decoding the signal based at least in part on a delta frequency being associated with a first carrier frequency and a second carrier frequency among the multiple carrier frequencies; and recovering data from the decoded signal.

Abstract: Certain aspects of the present disclosure provide techniques for wireless communications by an apparatus. A method includes transmitting, to a user equipment (UE), an indication of a first frequency of a first signal and an indication of a second frequency of a backscattered signal corresponding to the first signal; transmitting the first signal; and receiving, from the UE, information encoded in the backscattered signal.

Abstract: Methods, systems, and devices for wireless communications are described. In some communications systems, interference may impede signaling between a base station and a target user equipment (UE) such that a base station may identify a donor UE to relay communications to the target UE. The donor UE may receive a coded data packet from the base station, and may identify a radio network temporary identifier (RNTI) scrambling code for the packets addressed to the target UE. In cases where the donor UE identifies that the packet has an RNTI scrambling code associated with the target UE, the donor UE may forward the coded data packet to the target UE base on the RNTI scrambling code. Such early detection of data packets addressed to the target UE may allow for the UE to forward a data packet without fully decoding the packet.

Abstract: Methods, systems, and devices for wireless communications are described for improving sidelink communication reliability. In some examples, a user equipment (UE) may map allocated sidelink resources from a logical domain to a physical domain, where the mapped resources may include greater frequency diversity in the physical domain A frequency range of a sidelink control channel or of a sidelink data channel may be greater in the physical domain than in the logical domain after the mapping. In some examples, sidelink communications may be associated with an aggregation factor that represents a number of repetitions of a sidelink communication. In this example, a UE may repeat a sidelink communication within a contention-based resource pool a number of times before receiving feedback in order to increase communication reliability. A first UE may communicate a sidelink communication with a second UE using a resource mapping or repetitions of the sidelink communication.

Abstract: Certain aspects of the present disclosure provide a method for wireless communications at an ambient internet of things (IoT) device. The ambient IoT device measures signal strength of a downlink signal transmitted from a gNodeB (gNB). The ambient IoT device estimates a pathloss between the gNB and itself based at least on the measured signal strength. Based on the pathloss between the ambient IoT device and the gNB, and together with measured received power from an assisting node, the ambient IoT device may select a random access channel (RACH) occasion (RO) so that a received power at the gNB from the ambient IoT device is constrained to a limited range.

Abstract: Aspects of the present disclosure provide techniques for configuring a search space for sidelink communications between one or more sensors/actuators (SAs) and programmable logic controller (PLC) in internet of things (IoT) applications in order to minimize the number of subchannels that a receiver (e.g., PLC or SA) may need to blind decode. More particularly, the search space is configurable based on a hashing function that is based in part on a portion of the resources (e.g., PLC resources) that have been allocated or reserved for sidelink communication within the PLC subnetwork (or PLC group) from the sidelink resource pool available to a plurality of PLCs in a network. By limiting the search space to a subset of resources that are specific to the PLC subnetwork or group, the need for the SA or PLC to perform blind decoding of sidelink control information (SCI) may be further reduced.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a reader device may transmit a delta message that indicates a frequency difference between a data tone frequency for the reader device and a helper tone frequency. The reader device may transmit a data tone signal at the data tone frequency and a helper tone signal at the helper tone frequency. The helper tone signal may be a waveform that is shared among multiple reader devices. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for determining sidelink channel metrics using reference signal measurements of reference signals transmitted by other UEs. A first UE may receive a control message from a base station, and the control message may indicate a measurement threshold. The first UE may generate a reference signal measurement of a reference signal transmitted by a second UE via a sidelink channel between the first UE and the second UE. The UE may transmit a measurement report to the base station based at least in part on the measurement satisfying the threshold. The report may be a quantized value of the measurement or a bit indicating that the measurement satisfies the threshold. Based on receipt of the measurement report, the base station may determine to transmit data to the second UE via a transmission to the first UE.

Abstract: Methods, systems, and devices for wireless communication are described. A base station may transmit a grant to a first user equipment (UE) that indicates a resource allocation for a sidelink communication, either from the first UE to a second UE or from the second UE to the first UE. The grant may include a destination identifier associated with the sidelink communication, as well as a mapping between the resource allocation and the destination identifier. The destination identifier may be based on information in an indication received from the first UE. In some examples, the base station may configure a default receiver UE for transmissions from the first UE, and the base station may identify a receiver UE in the grant if the intended receiver UE is different than the default receiver UE.

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 frequency offset of a helper tone associated with a data communication, the helper tone associated with assisting the UE to filter one or more of noise or interference from data signaling associated with the data communication. The UE may receive the helper tone and the data communication, comprising data signals at different frequencies that are based at least in part on the frequency offset of the helper tone. Numerous other aspects are described.

Abstract: Disclosed are package devices that include interconnects on first and second surfaces of a package substrate. The interconnects on the first surface of the package substrate are configured to carry general purpose input-output (GPIO) and miscellaneous IO signals. The interconnects on the second surface of the package substrate are configured to carry high speed input-output (HSIO) signals-signals whose speeds are above some minimum speed threshold. In this way, the package form can be reduced while still allowing for increased number of IO signals to be delivered.

Abstract: Methods, systems, and devices for wireless communications are described. The method may involve a first user equipment (UE) receiving an indication of a set of sidelink resources and an indication of a set of uplink resources for transmitting sidelink feedback information. The first UE may receive a sidelink shared channel transmission from a second UE and upon receiving the sidelink shared transmission, generate feedback information regarding the sidelink shared channel transmission and transmit the feedback information directly to the base station using the set of uplink resources.

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may be configured to transmit a first sidelink control information (SCI) message associated with a first sidelink transmission from the first UE, the first SCI including a first indication of a first set of resources reserved for retransmissions of the first sidelink transmission at one or more retransmission occasions. The UE may identify a second SCI message associated with the first SCI message, the second SCI message including frequency domain resource allocation (FDRA) field values indicative of a second set of resources reserved for retransmissions of a second sidelink transmission, where the second SCI provides a release of at least some of the reserved resources. Additional aspects of signaling one or more configurations via resource indication fields are described.

Abstract: Systems and techniques are provided for accelerated ray tracing. For instance, a process can include obtaining a hierarchical acceleration data structure that includes a plurality of primitives of a scene object and obtaining a respective information value associated with each primitive included in the plurality of primitives. A sort order can be determined for two or more nodes included in a same level of the hierarchical acceleration data structure at least in part by sorting the two or more nodes based on a respective sorting parameter value determined for each respective node of the two or more nodes. Each respective sorting parameter value can be determined based on at least one information value associated with one or more primitives included in a sub-tree of each respective node of the two or more nodes. The hierarchical acceleration data structure can be traversed using the sort order.

Abstract: The present disclosure provide various methods, computer-readable media, and apparatuses for managing communication paths, which may include at least one direct communication path between UEs, such as a sidelink communication path. Illustratively, an apparatus of the present disclosure may be a UE or component thereof that is configured to establish a direct wireless communication link and an indirect wireless communication link with another UE to carry data associated with one traffic stream. Further, the apparatus may be configured to communicate with the other UE over at least one of the direct communication link or the indirect communication link after the direct communication link and the indirect communication link are established with the other UE.

Abstract: Aspect 19 is the apparatus of any of aspects 14-18, further includes that the value of the response time and a value of the first time slot are based on an actual slot of the transmission of the first SL-PRS.

Abstract: An integrated circuit (IC) device includes a substrate. The substrate includes a first side having a stepped configuration having a first surface that is elevated relative to a second surface. The first surface includes first solder resist openings (SROs), and the second surface includes second SROs. The IC device includes a first set of solder balls electrically connected to a first set of contacts in the first SROs. A solder ball of the first set of solder balls has a first characteristic dimension. The IC device also includes a second set of solder balls electrically connected to a second set of contacts in the second SROs. A solder ball of the second set of solder balls has a second characteristic dimension larger than the first characteristic dimension.