name: UL-SRS
full_form: Uplink Sounding Reference Signal
context: Inertial measurement unit (IMU) sensor can be used as potential indoor positioning enhancement techniques. An IMU can measure and report the velocity, orientation, and gravitational forces of a device, using a combination of accelerometers and gyroscopes, sometimes also magnetometers. IMU can be found in many existing devices/UEs in the market. It has been widely reported that IMU sensor information can be used for positioning purposes, in particular for indoor positioning. IMU sensor information is relevant for this study item, but will not impact RAN1 specifications. RAN2 identified the following Inertial measurement unit (IMU) based positioning options which may operate in the following mode: - Standalone/autonomous: The UE performs IMU related sensor measurements and computation without network assistance. The only protocol impact would be for the UE in the measurement/location report message to indicate that IMU as method has been used to enhance the positioning calculation. For
description: The Uplink Sounding Reference Signal (UL-SRS) is transmitted by the User Equipment (UE) to the base station in the uplink direction. It is configured by the Radio Resource Control (RRC) message and used for channel sounding and measurement purposes, enabling the network to estimate the uplink channel conditions.
explanation: The UL-SRS is explicitly described as a reference signal used for channel sounding and measurement. This aligns with the definition of a reference signal as a transmitted signal used by the network to estimate channel characteristics.
section_title: 8.2.9	Simulated Multi-RTT environment
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