Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives, from a serving base station of the UE, an SRS configuration. The UE transmits a first SRS and a second SRS in accordance with the SRS configuration. The UE sends, to a network, (a) an indication of a respective TX RF chain of the UE associated with each of the first SRS and the second SRS or (b) an indication of a timing delay error level of the respective TX RF chain associated with each of the first SRS and the second SRS.

Abstract: Various solutions for improving positioning by data augmentation for artificial intelligence/machine learning (AI/ML) positioning with respect to an apparatus in mobile communications are described. The apparatus may obtain a data input sample. The apparatus may perform a data augmentation to generate an augmented training data based on the data input sample. The apparatus may perform a model training on a positioning model based on the augmented training data. The apparatus may determine a position information of the apparatus by the positioning model.

Abstract: Various solutions for improving model performance monitor mechanism for artificial intelligence/machine learning (AI/ML) positioning with respect to an apparatus in mobile communications are described. The apparatus may receive model monitoring data from a network node. The apparatus may generate a model output by a positioning model based on the model monitoring data used as a model input. The apparatus may determine a model monitoring result based on the model output or transmit the model output to the network node.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE determines multiple uplink measurement occasions for transmitting multiple reference signals to a satellite in a non-terrestrial network (NTN). The UE generates, based on Global Navigation Satellite System (GNSS) location data of the UE and ephemeris data of the satellite, multiple timing advance (TA) reports that are linked to the multiple uplink measurement occasions, respectively. The UE transmits the multiple TA reports to the satellite at multiple time points. The UE transmits the multiple uplink reference signals to the satellite on the uplink measurement occasions.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a first UE. The first UE transmits sidelink control information to one or more second UEs. The sidelink control information includes an indication of a first resource reserved for transmitting first sidelink positioning reference signals (SL-PRSs) from the first UE to the one or more second UEs. The sidelink control information includes an indication requesting the one or more second UEs to transmit second SL-PRSs to the first UE in response to receiving the first SL-PRSs from the first UE. The first UE transmits the first SL-PRSs on the first resource to the one or more second UEs.

Abstract: Various solutions for enhancements on integer cycle report for carrier phase positioning are described. An apparatus may receive a positioning reference signal (PRS) from a first network node of a wireless network. The apparatus may measure a carrier phase associated with a delay path and a transmission frequency point of the PRS. Then, the apparatus may report the carrier phase to a second network node of the wireless network.

Abstract: Various solutions for supporting automatic gain control (AGC) symbol for sidelink positioning reference signal (SL-PRS) reception in mobile communications are described. Reception user equipment (Rx UE) may receive a first configuration for an SL-PRS resource. Rx UE may receive one AGC symbol for the SL-PRS resource. Rx UE may receive the SL-PRS resource based on the first configuration. A reference signal in the AGC symbol and an SL-PRS in a last SL-PRS symbol of the SL-PRS resource correspond to a same set of one or more subcarriers.

Abstract: Various solutions for slot aggregation design in non-terrestrial network (NTN) communications with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a demodulation reference signal (DMRS) time bundling configuration. The apparatus may determine a duration interval of the DMRS time bundling configuration. The apparatus may perform channel estimation cross slots based on the duration interval.

Abstract: Various solutions for transmission of sidelink-positioning reference signal (SL-PRS) with respect to user equipment in mobile communications are described. Transmission user equipment (Tx UE) may determine an SL-PRS configuration. The SL-PRS configuration includes resource reservation information and a sequence identifier. Tx UE may transmit the SL-PRS configuration to at least one reception user equipment (Rx UE). The sequence identifier is transmitted through a data channel. The resource reservation information is transmitted through the data channel or a control channel.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE measures, at a baseband, a UE RX-TX time difference at-baseband. The UE compensates the UE RX-TX time difference at-baseband to estimate a UE RX-TX time difference at-antenna. The UE sends, to a network, the UE RX-TX time difference at-antenna with an indication that reference points are at antennas and an indication of a TX chain, or a timing delay error level of the TX chain, intended to be used by the UE during the measuring or the compensating.

Abstract: Apparatus and methods are provided for RRM measurement in the NR network. In one novel aspect, the RRM measurement is configured with one measurement gap for SS block and CSI-RS. In one embodiment, an extended MGL (eMGL) is configured such that the SS block and CSI-RS is measurement within one measurement gap. In another embodiment, the shorter MGL (sMGL) that is shorter than the standard MGL is configured. In another novel aspect, the CSI-RS is allocated adjacent to the SS blocks such that one measurement gap is configured for both the SS block and CSI-RS measurement. In another novel aspect, the CSI-RS measurement is conditionally configured. In yet another novel aspect, the UE decodes the time index of the SS block conditionally.

Abstract: Various solutions for slot aggregation design in non-terrestrial network (NTN) communications with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a demodulation reference signal (DMRS) time bundling configuration. The apparatus may determine a duration interval of the DMRS time bundling configuration. The apparatus may perform channel estimation cross slots based on the duration interval.

Abstract: A method, which is applied to a UE, for controlling the transmission power of each of positioning (POS) sounding reference signals (SRSs) across a subset of multiple component carriers (CCs) in carrier aggregation is provided. A SRS configuration for a subset of the CCs is received. Pathlosses corresponding to SRS transmission in the subset of the CCs are measured. Pathloss measurements corresponding to the subset of the CCs are processed to obtain a single pathloss across the subset of the CCs. The transmission power of each of the POS-SRSs across the subset of the CCs is determined based on the single pathloss. Each of the POS-SRSs are transmitted with the transmission power through the CCs.

Abstract: A method of latency reduction for positioning-specific measurement reporting is provided. A User Equipment (UE) performs first measurements on Positioning Reference Signals (PRSs) to obtain first measurement results in response to receiving a location information request from a mobile communication network. The UE uses a first configured grant to transmit a first measurement report including the first measurement results to the mobile communication network. The UE performs second measurements on PRSs to obtain second measurement results in response to the same location information request. The UE uses the first configured grant to transmit a second measurement report including the second measurement results to the mobile communication network, without triggering a Scheduling Request (SR) procedure or a Buffer Status Report (BSR) procedure.

Abstract: In a sidelink positioning method, a target UE and/or one or more peer UEs may transmit and/or measure reference signals on a sidelink interface. The target UE may determine its own transmission configuration for such reference signals, potentially taking into account the measurement capabilities of one or more peer UEs. The target UE may request a transmission configuration for such reference signals from one or more peer UEs. The peer UEs may determine their own transmission configuration(s) for the reference signals, potentially taking into account any request received from the target UE and/or the measurement capabilities of the target UE. The capability information, reference signal configuration information, and measurement results may be exchanged among the UEs. Related positioning protocols may be carried over transport layers of the sidelink interface.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The apparatus may be a UE. The apparatus may be a UE. The UE receives one or more positioning reference signal parameters from a base station. The UE determines resource elements in a transmission bandwidth carrying multiple positioning reference signals based on the positioning reference signal parameters. The UE decodes symbols in the resource elements.

Abstract: In an aspect of the disclosure, a serving base station receives, from a UE, a measurement of a DL-RSTD with respect to a first TRP and a second TRP. The serving base station sends the DL-RSTD to a location management function, wherein the location management function further receives a first RTOA of an SRS arriving at the first TRP and a second RTOA of the SRS arriving at the second TRP. The serving base station receives, from the location management function, a relative time difference calculated based on the DL-RSTD, the first RTOA, and the second RTOA. The relative time difference indicates a synchronization error between the first TRP and the second TRP.

Abstract: A UE determines a respective set of subcarriers from N subcarriers in each OFDM symbol of M1 consecutive OFDM symbols within a slot. The respective set of subcarriers carries a respective set of SRSs that form transmission combs of a transmission comb size. The respective set of subcarriers in one of the M1 consecutive OFDM symbols do not overlap in frequency domain with the respective set of subcarriers in any other one of the M1 consecutive OFDM symbols. The UE applies the respective set of phase rotations to the respective set of SRSs in each OFDM symbol to obtain a cyclic shift. The UE maps the respective set of SRSs applied with phase rotations to the respective set of subcarriers in each OFDM symbol. The UE transmits the respective sets of SRSs in the M OFDM symbols.

Abstract: Techniques and examples of tracking reference signal and framework thereof in mobile communications are described. A user equipment (UE) receives, from a base station of a network, a reference signal via a communication link between the UE and the base station. The reference signal contains resource configuration with respect to tracking reference signal (TRS) configuration. The UE also receives, from the base station, a TRS burst containing a plurality of TRS symbols with one or more components of the UE configured according to the TRS configuration. The UE processes the TRS burst to perform channel estimation, synchronization, time tracking, frequency tracking, or a combination thereof.

Abstract: Various solutions for physical random access channel (PRACH) timing advance operation and PRACH configurations with respect to user equipment and network apparatus are described. An apparatus may determine a propagation delay between the apparatus and a network node. The apparatus may determine a pre-compensation timing margin. The apparatus may perform a timing advance pre-compensation according to the propagation delay and the pre-compensation timing margin. The apparatus may transmit an uplink signal by applying the timing advance pre-compensation.