8.8 Motion sensor positioning method

38.3053GPPNG Radio Access Network (NG-RAN)Release 17Stage 2 functional specification of User Equipment (UE) positioning in NG-RANTS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

8.8.1 General

Motion sensors can be used to estimate the location of the UE. With the combination of other positioning methods (hybrid) a more accurate position of the UE can be computed. UE using one or more motion sensors provides the movement information. The movement information comprises displacement results estimated as an ordered series of points.

The positioning modes supported are UE-Assisted, UE-Based, and Standalone.

8.8.2 Information to be transferred between NG-RAN/5GC Elements

8.8.2.1 General

This clause defines the information (e.g., assistance data, position and/or measurement data) that may be transferred between NG-RAN/5GC elements.

8.8.2.2 Information that may be transferred from the UE to LMF

The information transferred from the UE to the LMF consists of capability information and location measurements or UE position. The supported information elements are given in Table 8.8.2.2-1.

Table 8.8.2.2-1: Sensor Measurement Information that may be transferred from UE to the LMF

Information	UE‑assisted	UE-based/ Standalone
Displacement Timestamp	Yes	Yes
Displacement Information	Yes	Yes
Reference Position	Yes	Yes
Reference Time	Yes	Yes

8.8.2.2.1 UE-assisted, UE-based, Standalone mode

In the UE-assisted, UE-Based, and Standalone mode, the UE reports, displacement information, displacement timestamp, reference position and reference time.

8.8.2.2.2 UE Displacement and Movement Information

The UE may report movement and displacement information which comprises an ordered series of direction, distance travelled by the target device and the time intervals when these measurements are taken.

8.8.2.3 Information that may be transferred from the LMF to the UE

In this release, no information, e.g. assistance data is transferred to the UE.

8.8.3 Motion Sensors Location Information Transfer Procedure

8.8.3.1 General

The purpose of this procedure is to enable the LMF to request additional sensor measurements or to enable the UE to provide sensor measurements to the LMF for position calculation.

8.8.3.2 LMF initiated Location Information Transfer Procedure

Figure 8.8.3.2-1 shows the Location Information Transfer operations when the procedure is initiated by the LMF.

Figure 8.8.3.2-1: LMF-initiated Location Information Transfer Procedure

(1) The LMF sends a LPP Request Location Information message to the UE for invocation of motion sensor positioning. This request includes positioning instructions such as the positioning mode, specific requested UE measurements if any, and quality of service parameters (accuracy, response time).

(2) The UE performs the requested measurements. The UE sends an LPP Provide Location Information message to the LMF before the Response Time provided in step (1) elapsed. If the UE is unable to perform the requested measurements, or if the Response Time provided in step 1 elapsed before any of the requested measurements have been obtained, the UE returns any information that can be provided in an LPP message of type Provide Location Information which includes a cause indication for the not provided location information.

8.8.3.3 UE-initiated Location Information Delivery Procedure

Figure 8.8.3.3-1 shows the Location Information delivery operations for motion sensor method when the procedure is initiated by the UE.

Figure 8.8.3.3-1: UE-initiated Location Information Delivery Procedure

(1) The UE sends an LPP Provide Location Information message to the LMF. The Provide Location Information message may include UE sensor measurements or location estimate already available at the UE.