Content for &nbsp; TS 38.305 &nbsp; Word version:&nbsp; 18.0.0

Endpoint A may determine that certain SL-RTT positioning assistance data are desired and sends an SLPP Request Assistance Data message to Endpoint B. This request includes an indication of which specific SL-RTT assistance data are requested.

Table 8.15.2.2.2-1: Assistance data that may be transferred between endpoints.

If step 1 occurred, Endpoint B provides the requested assistance in an SLPP Provide Assistance Data message to Endpoint A, if available at Endpoint B. The assistance data that may be signalled are listed in Table 8.15.2.2.2-1. If any of the requested assistance data in step 1 are not provided in step 2, the Endpoint A shall assume that the requested assistance data are not supported, or currently not available at Endpoint B. If none of the requested assistance data in step 1 can be provided by Endpoint B, Endpoint B returns any information that can be provided in an SLPP message of type Provide Assistance Data which includes a cause indication for the not provided assistance data.

If step 1 did not occur, Endpoint B determines that SL-RTT assistance data needs to be provided to Endpoint A (e.g., as part of a positioning procedure) and sends an SLPP Provide Assistance Data message to Endpoint A.

Information
Application Layer ID, identifying a UE as defined in TS 23.287
SL-PRS Sequence ID as defined in TS 38.211
ARP ID, identifying an SL-PRS Tx ARP associated with a UE
Anchor UE location coordinates
SL-PRS Tx ARP location coordinates

8.15.2.2.3 Location Information transfer procedure p. 162

Figure 8.15.2.2.3-1 shows the Location Information transfer operations for the SL-RTT positioning method.

Reproduction of 3GPP TS 38.305, Fig. 8.15.2.2.3-1: Location Information transfer procedure.

Figure 8.15.2.2.3-1: Location Information transfer procedure.

Endpoint A may send an SLPP Request Location Information message to Endpoint B. This request includes an indication of SL-RTT measurements requested, including any needed measurement configuration information, and possibly a required response time as listed in Table 8.15.2.2.3-1.

If step 1 occurred, Endpoint B obtains the SL-RTT measurements as requested in step 1. Endpoint B then sends an SLPP Provide Location Information message to Endpoint A, before the Response Time (if provided in step 1) elapsed, and includes the obtained SL-RTT measurements as listed in Table 8.15.2.2.3-2. If Endpoint B is unable to perform the requested measurements, or the Response Time elapsed before any of the requested measurements were obtained, Endpoint B returns any information that can be provided in an SLPP message of type Provide Location Information which includes a cause indication for the not provided location information.

If step 1 did not occur, Endpoint B may send an SLPP Provide Location Information message to Endpoint A. The SLPP Provide Location Information message may include any SL-RTT results already available at Endpoint B.

Table 8.15.2.2.3-1: Location request information that may be transferred between endpoints

Optionally (e.g, if requested at step 1), Endpoint B may provide one or more additional SLPP Provide Location Information messages with SL-RTT measurements to Endpoint A (e.g., according to the periodic reporting criteria if received at step1).

Information
Requested location information type (location estimate, location measurements, range estimate, range measurements)
Periodic reporting criteria
Positioning QoS (desired horizontal/vertical accuracy, desired range accuracy, response time, velocity request)
Environment information (expected multipath and non line of sight (NLOS) in the current area) Scheduled location time
Requested measurement information: ARP Information Request LOS-NLOS Indicator Request SL-PRS-RSRP Request First Path SL-PRS-RSRPP Request Additional Paths Request Timing Quality Request Multiple SL-PRS Rx-Tx Time Differences Request Associated SL-PRS Tx Time Stamp Request

Table 8.15.2.2.3-2: Location result information that may be transferred between endpoints

Information	SL Target UE-assisted	SL Target UE-based
Location estimate	No	Yes
Range estimate	No	Yes
Velocity estimate	No	Yes
SL-RTT measurement information: LOS-NLOS Indicator ARP ID SL-PRS Resource ID SL-PRS Rx-Tx Time Difference measurement(s) SL-PRS-RSRP measurement SL-PRS First Path RSRPP measurement Additional paths measurement Time stamp of measurements Timing quality of measurements SL-PRS Tx time information	Yes	No

8.15.3 SL-AoA positioning p. 163

8.15.3.1 General p. 163

The SL-AoA positioning method makes use of SL angle of arrival measurements performed by a UE (e.g., target UE or anchor UE). The SL angle of arrival measurements performed by a UE of sidelink signals transmitted by a peer UE determines the azimuth and vertical angle (i.e., the direction) between the pair of UEs relative to a reference direction (e.g., geographical North).

8.15.3.2 SL-AoA positioning procedures p. 163

8.15.3.2.1 Capability transfer procedure p. 163

The capability transfer procedure for SL-AoA positioning is described in clause 7.11.2.1.

8.15.3.2.2 Assistance Data transfer procedure p. 163

Figure 8.15.3.2.2-1 shows the Assistance Data transfer operations for the SL-AoA positioning method.

Reproduction of 3GPP TS 38.305, Fig. 8.15.3.2.2-1: Assistance Data transfer procedure.

Figure 8.15.3.2.2-1: Assistance Data transfer procedure.

Endpoint A may determine that certain SL-AoA positioning assistance data are desired and sends an SLPP Request Assistance Data message to Endpoint B. This request includes an indication of which specific SL-AoA assistance data are requested.

Table 8.15.3.2.2-1: Assistance data that may be transferred between endpoints.

If step 1 occurred, Endpoint B provides the requested assistance in an SLPP Provide Assistance Data message to Endpoint A, if available at Endpoint B. The assistance data that may be signalled are listed in Table 8.15.3.2.2-1. If any of the requested assistance data in step 1 are not provided in step 2, the Endpoint A shall assume that the requested assistance data are not supported, or currently not available at Endpoint B. If none of the requested assistance data in step 1 can be provided by Endpoint B, Endpoint B returns any information that can be provided in an SLPP message of type Provide Assistance Data which includes a cause indication for the not provided assistance data.

If step 1 did not occur, Endpoint B determines that SL-AoA assistance data needs to be provided to Endpoint A (e.g., as part of a positioning procedure) and sends an SLPP Provide Assistance Data message to Endpoint A.

Information
Application Layer ID, identifying a UE as defined in TS 23.287
SL-PRS Sequence ID as defined in TS 38.211
ARP ID, identifying an SL-PRS Tx ARP associated with a UE
Anchor UE location coordinates
SL-PRS Tx ARP location coordinates
Expected AoA and uncertainty

8.15.3.2.3 Location Information transfer procedure p. 164

Figure 8.15.3.2.3-1 shows the Location Information transfer operations for the SL-AoA positioning method.

Reproduction of 3GPP TS 38.305, Fig. 8.15.3.2.3-1: Location Information transfer procedure.

Figure 8.15.3.2.3-1: Location Information transfer procedure.

Endpoint A may send an SLPP Request Location Information message to Endpoint B. This request includes an indication of SL-AoA measurements requested, including any needed measurement configuration information, and possibly a required response time as listed in Table 8.15.3.2.3-1.

If step 1 occurred, Endpoint B obtains the SL-AoA measurements as requested in step 1. Endpoint B then sends an SLPP Provide Location Information message to Endpoint A, before the Response Time (if provided in step 1) elapsed, and includes the obtained SL-AoA measurements as listed in Table 8.15.3.2.3-2. If Endpoint B is unable to perform the requested measurements, or the Response Time elapsed before any of the requested measurements were obtained, Endpoint B returns any information that can be provided in an SLPP message of type Provide Location Information which includes a cause indication for the not provided location information.

If step 1 did not occur, Endpoint B may send an SLPP Provide Location Information message to Endpoint A. The SLPP Provide Location Information message may include any SL-AoA results already available at Endpoint B.

Table 8.15.3.2.3-1: Location request information that may be transferred between endpoints.

Optionally (e.g, if requested at step 1), Endpoint B may provide one or more additional SLPP Provide Location Information messages with SL-AoA measurements to Endpoint A (e.g., according to the periodic reporting criteria if received at step1).

Information
Requested location information type (location estimate, location measurements, range estimate, range measurements)
Periodic reporting criteria
Positioning QoS (desired horizontal/vertical accuracy, desired direction accuracy, response time, velocity request)
Environment information (expected multipath and non line of sight (NLOS) in the current area) Scheduled location time
Requested measurement information: LOS-NLOS Indicator Request SL-PRS-RSRP Request First Path SL-PRS-RSRPP Request Additional Paths Request

Table 8.15.3.2.3-2: Location result information that may be transferred between endpoints

Information	SL Target UE-assisted	SL Target UE-based
Location estimate	No	Yes
Direction estimate	No	Yes
Velocity estimate	No	Yes
SL-AoA measurement information: LOS-NLOS Indicator Angle quality of measurements Additional paths angle measurement Azimuth/elevation measurement Azimuth/elevation LCS to GCS transformation parameter ARP ID SL-PRS Resource ID SL-PRS-RSRP measurement SL-PRS First Path RSRPP measurement Additional paths measurement Time stamp of measurements	Yes	No

8.15.4 SL-TDOA positioning p. 166

8.15.4.1 General p. 166

The SL-TDOA positioning method makes use of SL-RSTD measurements of SL-PRS received at the target UE from two or more peer UEs (e.g., anchor UEs). The target UE measures the SL-RSTD of the received SL-PRS transmitted by two or more peer UEs. The Target UE position is estimated based on the SL-RSTD measurements and the knowledge of the geographical coordinates of the peer UEs (e.g., Anchor UEs) and their relative sidelink timing.

8.15.4.2 SL-TDOA positioning procedures p. 166

8.15.4.2.1 Capability transfer procedure p. 166

The capability transfer procedure for SL-TDOA positioning is described in clause 7.11.2.1.

8.15.4.2.2 Assistance Data transfer procedure p. 166

Figure 8.15.4.2.2-1 shows the Assistance Data transfer operations for the SL-TDOA positioning method.

Reproduction of 3GPP TS 38.305, Fig. 8.15.4.2.2-1: Assistance Data transfer procedure.

Figure 8.15.4.2.2-1: Assistance Data transfer procedure.

Endpoint A may determine that certain SL-TDOA positioning assistance data are desired and sends an SLPP Request Assistance Data message to Endpoint B. This request includes an indication of which specific SL-TDOA assistance data are requested.

Table 8.15.4.2.2-1: Assistance data that may be transferred between endpoints.

If step 1 occurred, Endpoint B provides the requested assistance in an SLPP Provide Assistance Data message to Endpoint A, if available at Endpoint B. The assistance data that may be signalled are listed in Table 8.15.4.2.2-1. If any of the requested assistance data in step 1 are not provided in step 2, the Endpoint A shall assume that the requested assistance data are not supported, or currently not available at Endpoint B. If none of the requested assistance data in step 1 can be provided by Endpoint B, Endpoint B returns any information that can be provided in an SLPP message of type Provide Assistance Data which includes a cause indication for the not provided assistance data.

If step 1 did not occur, Endpoint B determines that SL-TDOA assistance data needs to be provided to Endpoint A (e.g., as part of a positioning procedure) and sends an SLPP Provide Assistance Data message to Endpoint A.

Information
Application Layer ID, identifying a UE as defined in TS 23.287
SL-PRS Sequence ID as defined in TS 38.211
ARP ID, identifying an SL-PRS Tx ARP associated with a UE
Anchor UE location coordinates
SL-PRS Tx ARP location coordinates
Synchronization information between anchor UEs

8.15.4.2.3 Location Information transfer procedure p. 167

Figure 8.15.4.2.3-1 shows the Location Information transfer operations for the SL-TDOA positioning method.

Reproduction of 3GPP TS 38.305, Fig. 8.15.4.2.3-1: Location Information transfer procedure.

Figure 8.15.4.2.3-1: Location Information transfer procedure.

Endpoint A may send an SLPP Request Location Information message to Endpoint B. This request includes an indication of SL-TDOA measurements requested, including any needed measurement configuration information, and possibly a required response time as listed in Table 8.15.4.2.3-1.

If step 1 occurred, Endpoint B obtains the SL-TDOA measurements as requested in step 1. Endpoint B then sends an SLPP Provide Location Information message to Endpoint A, before the Response Time (if provided in step 1) elapsed, and includes the obtained SL-TDOA measurements as listed in Table 8.15.4.2.3-2. If Endpoint B is unable to perform the requested measurements, or the Response Time elapsed before any of the requested measurements were obtained, Endpoint B returns any information that can be provided in an SLPP message of type Provide Location Information which includes a cause indication for the not provided location information.

If step 1 did not occur, Endpoint B may send an SLPP Provide Location Information message to Endpoint A. The SLPP Provide Location Information message may include any SL-TDOA results already available at Endpoint B.

Table 8.15.4.2.3-1: Location request information that may be transferred between endpoints.

Optionally (e.g, if requested at step 1), Endpoint B may provide one or more additional SLPP Provide Location Information messages with SL-TDOA measurements to Endpoint A (e.g., according to the periodic reporting criteria if received at step1).

Information
Requested location information type (location estimate, location measurements)
Periodic reporting criteria
Positioning QoS (desired horizontal/vertical accuracy, response time, velocity request)
Environment information (expected multipath and non line of sight (NLOS) in the current area)
Scheduled location time
Requested measurement information: ARP Information Request LOS-NLOS Indicator Request SL-PRS-RSRP Request First Path SL-PRS-RSRPP Request Additional Paths Request SL Timing Quality Request

Table 8.15.4.2.3-2: Location result information that may be transferred between endpoints

Information	SL Target UE-assisted	SL Target UE-based
Location estimate	No	Yes
Velocity estimate	No	Yes
SL-TDOA measurement information: LOS-NLOS Indicator ARP ID SL-PRS Resource ID SL-PRS-RSRP measurement SL-PRS First Path RSRPP measurement SL-RSTD measurement Additional paths measurement Time stamp of measurements Timing quality of measurements	Yes	No

8.15.5 SL-TOA positioning p. 168

8.15.5.1 General p. 168

The SL-TOA positioning method makes use of SL-RTOA measurements performed at multiple peer UEs (e.g., anchor UEs). The target UE transmits SL-PRS and the peer UEs (e.g., anchor UEs) measures the SL-RTOA relative to the peer UEs (e.g., anchor UEs) own time base. The Target UE position is estimated based on the SL-RTOA measurements and the knowledge of the geographical coordinates of the peer UEs (e.g., Anchor UEs) and their relative sidelink timing.

8.15.5.2 SL-TOA positioning procedures p. 168

8.15.5.2.1 Capability transfer procedure p. 168

The capability transfer procedure for SL-TOA positioning is described in clause 7.11.2.1.

8.15.5.2.2 Assistance Data transfer procedure p. 168

Figure 8.15.5.2.2-1 shows the Assistance Data transfer operations for the SL-TOA positioning method.

Reproduction of 3GPP TS 38.305, Fig. 8.15.5.2.2-1: Assistance Data transfer procedure.

Figure 8.15.5.2.2-1: Assistance Data transfer procedure.

Endpoint A may determine that certain SL-TOA positioning assistance data are desired and sends an SLPP Request Assistance Data message to Endpoint B. This request includes an indication of which specific SL-TOA assistance data are requested.

Table 8.15.5.2.2-1: Assistance data that may be transferred between endpoints.

If step 1 occurred, Endpoint B provides the requested assistance in an SLPP Provide Assistance Data message to Endpoint A, if available at Endpoint B. The assistance data that may be signalled are listed in Table 8.15.5.2.2-1. If any of the requested assistance data in step 1 are not provided in step 2, the Endpoint A shall assume that the requested assistance data are not supported, or currently not available at Endpoint B. If none of the requested assistance data in step 1 can be provided by Endpoint B, Endpoint B returns any information that can be provided in an SLPP message of type Provide Assistance Data which includes a cause indication for the not provided assistance data.

If step 1 did not occur, Endpoint B determines that SL-TOA assistance data needs to be provided to Endpoint A (e.g., as part of a positioning procedure) and sends an SLPP Provide Assistance Data message to Endpoint A.

Information
Application Layer ID, identifying a UE as defined in TS 23.287
SL-PRS Sequence ID as defined in TS 38.211
ARP ID, identifying an SL-PRS Tx ARP associated with a UE
Anchor UE location coordinates
SL-PRS Tx ARP location coordinates
Synchronization information between anchor UEs

8.15.5.2.3 Location Information transfer procedure p. 169

Figure 8.15.5.2.3-1 shows the Location Information transfer operations for the SL-TOA positioning method.

Reproduction of 3GPP TS 38.305, Fig. 8.15.5.2.3-1: Location Information transfer procedure.

Figure 8.15.5.2.3-1: Location Information transfer procedure.

Endpoint A may send an SLPP Request Location Information message to Endpoint B. This request includes an indication of SL-TOA measurements requested, including any needed measurement configuration information, and possibly a required response time as listed in Table 8.15.5.2.3-1.

If step 1 occurred, Endpoint B obtains the SL-TOA measurements as requested in step 1. Endpoint B then sends an SLPP Provide Location Information message to Endpoint A, before the Response Time (if provided in step 1) elapsed, and includes the obtained SL-TOA measurements as listed in Table 8.15.5.2.3-2. If Endpoint B is unable to perform the requested measurements, or the Response Time elapsed before any of the requested measurements were obtained, Endpoint B returns any information that can be provided in an SLPP message of type Provide Location Information which includes a cause indication for the not provided location information.

If step 1 did not occur, Endpoint B may send an SLPP Provide Location Information message to Endpoint A. The SLPP Provide Location Information message may include any SL-TOA results already available at Endpoint B.