Abstract: A method is provided that includes receiving a configuration of selection criteria for a timing advance (TA) of a target cell, acquired by respective acquisition schemes including a user equipment (UE)-based acquisition scheme and a random access channel (RACH)-based acquisition scheme. The method includes acquiring a UE-based TA value according to the UE-based acquisition scheme, and transmitting a random access preamble to the target cell that is configured to acquire a RACH-based TA value according to the RACH-based acquisition scheme. The method includes receiving a cell-switch command from a serving cell to trigger a cell switch to the target cell, after the UE-based TA value and the RACH-based TA value are acquired. And the method includes accessing the target cell using a TA value selected from the UE-based TA value and the RACH-based TA value, based on the configuration.

Abstract: A user equipment (UE) may receive, from a first network entity, an indication of a configuration for the UE to report, to the first network entity, an estimate of a first timing advance value for a second network entity. The UE may determine the estimate of the first timing advance value. The UE may transmit, to the first network entity, the estimate of the first timing advance value for the second network entity or a reference signal time difference associated with the estimate of the first timing advance value. The UE may receive, from the first network entity, an indication of an error value associated with the estimate of the first timing advance value. The UE may determine a second timing advance value based on the estimate of the first timing advance value and the error value. The UE may transmit communications using the second timing advance value.

Abstract: A method includes receiving, by a first user device in a wireless network that is performing sessionless positioning based on sidelink-positioning reference signal (SL-PRS), a user device identifier of a second user device in a vicinity of the first user device that is transmitting sidelink-positioning reference signal and SL-PRS identification information associated with the sidelink-positioning reference signal transmitted by the second user device; transmitting, by the first user device, sidelink control information including at least one of an indication that the first user device is performing sessionless positioning, a user device identifier of the first user device, the user device identifier of the second user device, or the SL-PRS identification information; and performing, by the first user device, at least one measurement on the sidelink-positioning reference signal transmitted by the second user device for sessionless positioning of the first user device.

Abstract: Embodiments of the present disclosure relate to sidelink positioning session establishment. In an aspect, a terminal device obtains session information associated with a first sidelink positioning session, and determines, based on the session information, difference information between the first sidelink positioning session and a second sidelink positioning session in which the terminal device is a target device. The terminal device transmits a positioning request for determining at least one anchor device to perform the second sidelink positioning session, wherein the positioning request comprises the difference information. The terminal device performs the second sidelink positioning session with the at least one anchor device. The embodiments of the present disclosure can immediately activate the target device in an efficient manner with reduced signaling overhead and latency.

Abstract: A first device in a wireless network receives, from a second device in the wireless network, a report of violation of parameter(s) for positioning of the second device using SLPP. The first device applies corrective measure(s) to mitigate an effect of the violation. In a wireless network having a first device and a second device, the second device determines a violation of parameter(s) has occurred for positioning of the second device using SLPP. The second device sends, to a first device, a report of the violation of the parameter(s).

Abstract: Embodiments of the present disclosure relate to apparatuses, methods, and computer readable storage media for isolation enforcement for delivery of sidelink positioning protocol (SLPP) messages. In the methods, a first apparatus receives, from a second apparatus, a request comprising a first indication that is to be indicated to a third apparatus. The first apparatus and the second apparatus are involved in a sidelink positioning process. Then, the first apparatus transmits the first indication to the third apparatus. Furthermore, the first apparatus transmits, to the second apparatus, information at least indicating reachability between the first apparatus and the third apparatus based on monitoring of feedback information associated with the first indication from the third apparatus. Thereby, the proposed methods can advantageously support the delivery of SLPP messages to out-of-reach devices.

Abstract: Example embodiments of the present disclosure are directed to anchor selection in sidelink positioning. A method comprises: monitoring, at a first apparatus, proximity of the first apparatus with respect to at least one apparatus during a sidelink positioning session; and in accordance with a determination that proximity of the first apparatus with respect to a second apparatus satisfies an event detection condition, transmitting an event detection indication to at least one third apparatus which performs an action related to anchor devices for use in the sidelink positioning session.

Abstract: The present disclosure relates to reference signal transmission alignment. In particular, a target device determines whether a reference signal transmission alignment is needed among a set of anchor devices. If the reference signal transmission alignment is needed, an anchor device receives a request for the reference signal transmission alignment. The anchor device determines a transmission time window based on the request and transmits a reference signal as per the transmission time window. In this way, it can mitigate an impact of synchronization timing reference change at the target device in measurement. Consequently, the solution allows for high accuracy measurements and hence enables high accuracy sidelink positioning.

Abstract: In accordance with an example embodiment of the present disclosure an apparatus that is caused to receive, at a central unit, CU, a first indication of a random access, RA, attempt associated with a first user equipment, the first indication comprising a RA preamble ID, RAPID; a RA radio network temporary identifier, RA-RNTI; and an identifier of a target cell; to start a collision detection timer responsive to receiving the first indication; and to determine a preamble collision related to timing advance, TA, acquisition in a Layer1/Layer2 triggered mobility procedure, responsive to receiving, at the CU, during the collision detection timer is running, a second indication of an RA attempt associated with a second user equipment, the second indication comprising the same RAPID, RA-RNTI and identifier of the target cell as the first indication.

Abstract: There is provided an apparatus comprising means for means for receiving a configuration for L3 measurement reporting at a user equipment from a network node, the configuration comprising an indication of a trigger event for reporting L3 measurements, means for performing the L3 measurements, means for determining the occurrence of the trigger event; and means for, in response to the determining, providing the L3 measurements to the network node in an L1 measurement report.

Abstract: Embodiments of the present disclosure disclose methods and apparatuses for sidelink positioning. A first terminal device transmits capability information of the first terminal device along with a positioning reference signal (PRS), and the capability information indicates a capability to provide the location information of the first terminal device. Then the first terminal device receives a request for the location information of the first terminal device from a second terminal device. Based on receiving the request, the first terminal device transmits the location information along with a subsequent PRS. As such, in embodiments of the present disclosure, the first terminal device may transmit location information according to the request of the second terminal device. Thereby the sidelink positioning performance is improved.

Abstract: Example embodiments of the present disclosure relate to sidelink positioning. In an example method, a terminal device detects a positioning reference signal (PRS) from a second terminal device and location information transmission associated with the PRS in case the location information was transmitted. The terminal device determines that the PRS is transmitted without location information of the second terminal device. The terminal device transmits, to a network device, indication information for indicating the PRS transmitted without the location information of the second terminal device. Sidelink positioning performance can be improved.

Abstract: A transmitter has a transmit chain that is configured to format transmit data into a frame structure that comprises signal blocks interspersed with training sequences for assisting a receive operation. The transmit chain is configured to insert two training sequences between a signal block and its following signal block in the frame structure. The transmitter also comprises a sequence generator configured to form the two training sequences, and in particular to form them such that a first of the training sequences is a negative of the second. Having one training sequence being the negative of the other helps to avoid the Direct Current (DC) subcarrier and provides good properties for channel estimation.