Abstract: This disclosure provides systems, methods, and devices for wireless communication that support enhanced positioning operations using a repeater. In a first aspect, a method of wireless communication includes receiving, by the UE, an instruction from a base station (BS) to perform a first signal measurement at a first time and a second signal measurement at a second time; determining, by the UE and based on the instruction, a first signal characteristic of a first signal during the first time corresponding to a time when a first repeater is repeating the first signal from a base station; determining, by the UE and based on the instruction, a second signal characteristic of a second signal during the second time corresponding to a time when the first repeater is not repeating the second signal; and a location of the UE is determined based on the first signal characteristic and the second signal characteristic.

Abstract: A wireless device may receive environment information associated with an area. The wireless device may simulate a set of positioning measurements based on the environment information. The wireless device may calculate a positioning environment based on the simulated set of positioning measurements. The wireless device may calculate the positioning environment further based on a set of measured positioning signals obtained by the wireless device. The wireless device may output the positioning environment to train a positioning model. The wireless device may output the positioning environment by training the positioning model at the wireless device based on the positioning environment. The wireless device may output the positioning environment by transmitting the positioning environment to a training entity to train the positioning model.

Abstract: In an aspect, a user equipment (UE) may measure one or more positioning reference signals (PRS) transmitted by one or more transmission-reception-points (TRPs). The UE may measure one or more backscattered signals received from one or more ambient Internet-of-things (IoT) anchor devices, wherein the one or more backscattered signals correspond to the one or more PRS received at the one or more ambient IoT anchor devices.

Abstract: Disclosed are techniques for wireless communication. In an aspect, a communication device may receive a reference signal from a communication station, wherein the reference signal is based on a reference component carrier. The communication device may generate one or more control signals based on one or more keying signals, the one or more keying signals having respective one or more keying frequencies. The communication device may transmit a backscattered signal based on the reference signal and the one or more control signals, wherein the backscattered signal is based on one or more pairs of component carriers that correspond to the reference component carrier shifted by the one or more keying frequencies.

Abstract: Disclosed are techniques for wireless communication. In an aspect, a first network node obtains one or more first positioning measurements of one or more reference signals transmitted by one or more second network nodes during a positioning session between a user equipment (UE) and a location server, and obtains one or more second positioning measurements of one or more backscattered signals of the one or more reference signals during the positioning session, wherein the one or more backscattered signals are transmitted by one or more ambient radio frequency identification (RFID) devices.

Abstract: In an aspect, a position estimation entity (e.g., UE, gNB, LMF, etc.) identifies a pool of UEs for a SL-assisted position estimation procedure of a set of target UEs. SL SRS-Ps are communicated (e.g., transmitted and measured) between the pool of UEs (e.g., for relative SL ranging). UL SRS-Ps are communicated by at least some of the UEs in the pool of UEs. The position estimation entity obtains measurement data for both the SL SRS-P and UL-SRS-P communications. The position estimation entity determines a position estimate for each UE in the set of UEs based on the measurement information.

Abstract: Methods and apparatus for predicting wireless measurements based on virtual access points is described. In some embodiments, a location of a user equipment (UE) may be obtained, and given the location of the UE, an output may be generated using a machine learning model, the output including one or more predicted wireless measurements. The output may be indicative of a wireless channel in a multipath environment. In some variants, the machine learning model may have been trained by obtaining a training dataset including multipath components data and ground truth locations of a wireless device, and performing an optimization with respect to the multipath components data and the ground truth locations. In some implementations, a training output including a predicted multipath component may be produced during the training, and the optimization may include an iterative minimization of an error between at least the predicted multipath component and a labeled multipath component.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support backscatter based positioning. In a first aspect, a method of wireless communication includes receiving, from a transmit network entity, a data signal via a first channel. The method also includes receiving, from a tag device, a backscatter signal based on the data signal received by the tag device via the first channel. The backscatter signal is received via a second channel that is different from the first channel. The method further includes transmitting a report that indicates a position measurement associated with a position of the tag device. The position measurement is determined based on the received data signal and the received backscatter signal. Other aspects and features are also claimed and described.

Abstract: Disclosed are techniques for wireless communication. In an aspect, a radio frequency identification (RFID) station may receive a first packet from an RFID tag at a first arrival time. The RFID station may receive a second packet from the RFID tag at a second arrival time after the first arrival time. The RFID station may estimate a distance between the RFID station and the RFID tag based on an inter-packet arrival time between the first packet and the second packet, the inter-packet arrival time being based on a time difference between the first arrival time and the second arrival time.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support a velocity estimation, such as a velocity estimation with radio frequency (RF) sensing. In a first aspect, a velocity of an object is determined based on doppler measurements from multiple transmission/reception points (TRPs). In a second aspect, the velocity of the object is determined based on angle of arrival (AoA) information received from multiple TRPs. The AoA information may include a range, an AoA, a time, or a combination thereof. In a third aspect, the velocity of the object is determined based on an orientation of the object during a sensing operation performed by a TRP. Other aspects and features are also claimed and described.

Abstract: Disclosed are techniques for wireless communication. In an aspect, a radio frequency identification (RFID) device receives, from an RFID tag, a first backscattered signal, receives, from the RFID tag, a second backscattered signal having a known time offset relative to the first backscattered signal, and performs interference cancellation on the first backscattered signal based on the second backscattered signal.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support backscatter-based positioning. In a first aspect, a method of wireless communication includes transmitting a tag configuration message that indicates a first tag configuration and a second tag configuration. The method also includes transmitting a positioning reference signal (PRS). The method also includes receiving, from a first tag device, a first backscatter signal based on the PRS, and receiving, from a second tag device, a second backscatter signal based on the PRS. The method includes transmitting a measurement report that indicates a first round trip time (RTT) of the first tag device, and a second RTT of the second tag device. The first RTT is based on the first tag configuration and the first backscatter signal, and the second RTT is based on the second tag configuration and the second backscatter signal.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support backscatter-based positioning. In a first aspect, a method of wireless communication includes receiving multiple measurement reports associated with a surface acoustic wave (SAW) tag device. The multiple measurement reports include, for each transmission/reception point (TRP) of multiple TRPs, a measurement report of the TRP. The method also includes determining, based on the multiple measurement reports, a position of the SAW tag device. Other aspects and features are also claimed and described.

Abstract: Disclosed are techniques for wireless communication. In an aspect, radio frequency identification (RFID) device may receive a positioning reference signal that is transmitted over a set of radio resources of a wireless communications network, the positioning reference signal including a first temporal portion for energy harvesting and a second temporal portion for backscattering. The RFID device may transmit a backscattered signal based on at least a part of the second temporal portion of the positioning reference signal.

Abstract: Disclosed are techniques for wireless communication. In an aspect, a location server may receive measurement reports from one or more receiving radio frequency identification (RFID) stations, the measurement reports being based on a backscattered signal from an RFID device observed at the one or more receiving RFID stations, and the backscattered signal being based on a positioning reference signal transmitted by a user equipment (UE). The location server may determine an estimated position of the RFID device based on the measurement reports.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support backscatter-based positioning. In a first aspect, a method of wireless communication includes receiving multiple measurement reports associated with a tag device. The multiple measurement reports includes, for each transmission/reception point (TRP) of a group of TRPs, a measurement report of the TRP. The method also includes determining a position of the tag device based on the multiple measurement reports and a tag delay of the tag device. Other aspects and features are also claimed and described.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support backscatter-based positioning. In a first aspect, a method of wireless communication includes receiving multiple measurement reports associated with a tag device. The multiple measurement including, for each transmission/reception point (TRP) of multiple TRPs, a measurement report of the TRP. The method further includes determining, based on the multiple measurement reports, a position of the tag device having a tag delay that is unknown to a network entity.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support backscatter-based positioning. In a first aspect, a method of wireless communication includes receiving, from a first transmission/receiving point (TRP), a first measurement report associated with a positioning session for a tag device. The method further includes receiving, from a second TRP, a second measurement report. The method also includes determining a position of the tag device based on the first measurement report, the second measurement report, and line of sight information associated with a line of sight between the first TRP and the second TRP. Other aspects and features are also claimed and described.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support backscatter-based positioning. In a first aspect, a method of wireless communication includes receiving a tag device indicator that indicates a tag capability of a tag device. The method also includes generating a tag configuration associated with transmission of a backscatter signal based on a positioning reference signal (PRS). The tag configuration indicates a frequency shifting parameter based on a frequency shifting capability of a tag device, a phase scrambling parameter based on a phase scrambling capability of the tag device, or a combination thereof. The method further includes transmitting the tag configuration. Other aspects and features are also claimed and described.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support backscatter-based positioning. In a first aspect, a method of wireless communication includes receiving a tag device indicator that indicates a tag capability of a tag device. The method also includes transmitting, to a first transmission/reception point (TRP) of a plurality of TRPs, a positioning reference signal (PRS) configuration associated with a PRS, the PRS configuration based on the tag capability, the plurality of TRPs including the first TRP designated as a transmit (Tx) TRP and a second TRP designated as a receive (Rx) TRP. The method further includes receiving a measurement report from the second TRP based on a backscatter signal of the positioning reference signal transmitted by the first TRP. Other aspects and features are also claimed and described.