Content for &nbsp; TS 38.305 &nbsp; Word version:&nbsp; 18.3.0

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, for which the assistance data are applicable
SL-PRS Sequence ID as defined in TS 38.211
Anchor UE location coordinates
SL-PRS Tx ARP location coordinates
SL-PRS Tx Information (SL-PRS Priority, SL-PRS Delay Budget, SL-PRS Bandwidth, SL-PRS Periodicity, SL-PRS Tx trigger indication)
Association information between SL-PRS Tx ARP-ID and the already transmitted SL PRS resource(s)

8.15.2.2.3 Location Information transfer procedure p. 166

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 (e.g., location estimate, location measurements, range estimate, range measurements)
Periodic reporting criteria (amount of reports and reporting interval)
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 SL-PRS-RSRPP Request Additional Paths Request Tx Time Info Request Multiple SL-PRS Rx-Tx Time Differences Request Measurements for multiple ARP-IDs 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: Application Layer ID of the peer UE from which the measurements were made LOS-NLOS Indicator SL-PRS Rx ARP ID Measurement Result List (NOTE 1): SL-PRS Resource ID SL-PRS Rx-Tx Time Difference measurement SL-PRS-RSRP measurement SL-PRS-RSRPP measurements Additional paths measurement Time stamp of measurements Timing quality of measurements SL-PRS Tx time information	Yes	No
NOTE 1: The Measurement Result List may be provided up to 4 times with: multiple Rx-Tx Time Difference Measurements for the same SL-PRS transmission and up to 4 different SL-PRS receptions, multiple Rx-Tx Time Difference Measurements for the same SL-PRS reception and up to 4 different SL-PRS transmissions, both, (a) and (b).

8.15.3 SL-AoA positioning p. 168

8.15.3.1 General p. 168

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. 168

8.15.3.2.1 Capability transfer procedure p. 168

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. 168

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, for which the assistance data are applicable
SL-PRS Sequence ID as defined in TS 38.211
Anchor UE location coordinates
SL-PRS Tx ARP location coordinates
SL-PRS Tx Information (SL-PRS Priority, SL-PRS Delay Budget, SL-PRS Bandwidth, SL-PRS Periodicity, SL-PRS Tx trigger indication)
Association information between SL-PRS Tx ARP-ID and the already transmitted SL PRS resource(s)
Expected AoA and uncertainty

8.15.3.2.3 Location Information transfer procedure p. 169

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 (e.g., location estimate, location measurements, range estimate, range measurements)
Periodic reporting criteria (amount of reports and reporting interval)
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: Azimuth and/or Zenith Angle-of-Arrival Request AoA measurements requested in Global Coordinate System (GCS) or Local Coordinate System (LCS) with or without LCS to GCS transformation parameter Measurements for multiple ARP-IDs Request ARP Information Request LOS-NLOS Indicator Request SL-PRS-RSRP Request 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: Application Layer ID of the peer UE from which the measurements were made LOS-NLOS Indicator Quality of angle measurements Additional paths angle measurement Azimuth/elevation measurement LCS to GCS transformation parameter SL-PRS Rx ARP ID SL-PRS Resource ID SL-PRS-RSRP measurement SL-PRS-RSRPP measurement Time stamp of measurements	Yes	No

8.15.4 SL-TDOA positioning p. 171

8.15.4.1 General p. 171

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. 171

8.15.4.2.1 Capability transfer procedure p. 171

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. 171

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, for which the assistance data are applicable
SL-PRS Sequence ID as defined in TS 38.211
Anchor UE location coordinates
SL-PRS Tx ARP location coordinates
SL-PRS Tx Information (SL-PRS Priority, SL-PRS Delay Budget, SL-PRS Bandwidth, SL-PRS Periodicity, SL-PRS Tx trigger indication)
Association information between SL-PRS Tx ARP-ID and the already transmitted SL PRS resource(s)
Synchronization information between anchor UEs (RTDs)

8.15.4.2.3 Location Information transfer procedure p. 172

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 (e.g., location estimate, location measurements)
Periodic reporting criteria (amount of reports and reporting interval)
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 SL-PRS-RSRPP Request Additional Paths Request Measurements for multiple ARP-IDs 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: Application Layer ID of the peer UE from which the measurements were made LOS-NLOS Indicator SL-PRS Rx ARP ID SL-PRS Resource ID SL-PRS-RSRP measurement SL-PRS-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. 173

8.15.5.1 General p. 173

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. 173

8.15.5.2.1 Capability transfer procedure p. 173

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. 173

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, for which the assistance data are applicable
SL-PRS Sequence ID as defined in TS 38.211
Anchor UE location coordinates
SL-PRS Tx ARP location coordinates
SL-PRS Tx Information (SL-PRS Priority, SL-PRS Delay Budget, SL-PRS Bandwidth, SL-PRS Periodicity, SL-PRS Tx trigger indication)
Association information between SL-PRS Tx ARP-ID and the already transmitted SL PRS resource(s)
Synchronization information between anchor UEs (RTDs)

8.15.5.2.3 Location Information transfer procedure p. 174

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.