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Content for  TS 38.305  Word version:  18.6.0

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8.5 WLAN positioning  8.5.1 General  8.5.2 Information to be transferred between NG-RAN/5GC Elements  8.5.2.0 General  8.5.2.1 Information that may be transferred from the LMF to UE  8.5.2.1.0 General  8.5.2.1.1 WLAN AP BSSID  8.5.2.1.2 WLAN AP SSID  8.5.2.1.3 WLAN AP Type Data  8.5.2.1.4 WLAN AP Location  8.5.2.2 Information that may be transferred from the UE to LMF  8.5.2.2.0 General  8.5.2.2.1 Standalone mode  8.5.2.2.2 UE-assisted mode  8.5.2.2.3 UE-based mode  8.5.3 WLAN Positioning Procedures  8.5.3.1 Capability Transfer Procedure  8.5.3.2 Assistance Data Transfer Procedure  8.5.3.2.0 General  8.5.3.2.1 LMF initiated Assistance Data Delivery  8.5.3.2.2 UE initiated Assistance Data Transfer  8.5.3.3 Location Information Transfer Procedure  8.5.3.3.0 General  8.5.3.3.1 LMF initiated Location Information Transfer Procedure  8.5.3.3.2 UE-initiated Location Information Delivery Procedure 
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8.5  WLAN positioning  p. 106

8.5.1  General  p. 106

In the WLAN positioning method, the UE position is estimated with the knowledge of geographical coordinate of reference WLAN access points. This is accomplished by collecting a certain amount of measurements from UE's WLAN receivers, and applying a location determination algorithm using databases of the estimated position's references points.
The UE WLAN measurements may include:
  • WLAN Received Signal Strength (RSSI);
  • Round Trip Time (RTT) between WLAN Access Point and the UE.
Three positioning modes are supported:
  • Standalone: The UE performs WLAN position measurements and location computation, without network assistance.
  • UE-assisted: The UE provides WLAN position measurements with or without assistance from the network to the LMF for computation of a location estimate by the network.
  • UE-based: The UE performs WLAN position measurements and computation of a location estimate with network assistance.
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8.5.2  Information to be transferred between NG-RAN/5GC Elements  p. 106

8.5.2.0  General |R18|  p. 106

This clause defines the information that may be transferred between LMF and UE.

8.5.2.1  Information that may be transferred from the LMF to UE  p. 107

8.5.2.1.0  General |R18|  p. 107
Table 8.5.2.1.0-1 lists assistance data for both UE-assisted and UE-based modes that may be sent from the LMF to the UE.
Assistance Data
WLAN AP List
  • BSSID
  • SSID
  • AP Type Data (note 1)
  • AP Location
NOTE 1:
WLAN AP Type Data may include WLAN Type (e.g., 802.11a/b/g/n/ac/ad, etc.), transmit power, antenna gain, coverage area, etc.
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8.5.2.1.1  WLAN AP BSSID  p. 107
This assistance data provides the BSSID of the WLAN access point [21].
8.5.2.1.2  WLAN AP SSID  p. 107
This assistance data provides the SSID of the WLAN access point [21].
8.5.2.1.3  WLAN AP Type Data  p. 107
This assistance data provides additional information about the access point and may include WLAN Type (e.g., 802.11a/b/g/n/ac/ad, etc.), transmit power, antenna gain, coverage area, etc. [21]
8.5.2.1.4  WLAN AP Location  p. 107
This assistance data provides the location (possibly including altitude information) of the access point [21].

8.5.2.2  Information that may be transferred from the UE to LMF  p. 107

8.5.2.2.0  General |R18|  p. 107
The information that may be signalled from the UE to the LMF is summarized in Table 8.5.2.2.0-1.
Information UE Assisted UE-based / Standalone
WLAN Location Information
BSSIDYesNo
SSIDYesNo
Received Signal Strength (RSSI)YesNo
Round Trip Time (RTT)YesNo
Time StampYesNo
Measurement characteristicsYesNo
UE Location Information
UE position estimate with uncertainty shapeNoYes
Position Time StampNoYes
Location Source (method(s) used to compute location)NoYes
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8.5.2.2.1  Standalone mode  p. 108
In Standalone mode, the UE reports the latitude, longitude and possibly altitude, together with an estimate of the location uncertainty, if available.
The UE should also report an indication of WLAN method and possibly other positioning methods used to calculate a fix.
8.5.2.2.2  UE-assisted mode  p. 108
In UE-assisted mode, the UE should report:
  • The BSSID/SSID of the measured WLAN access points, and associated RSSI or RTT.
8.5.2.2.3  UE-based mode  p. 108
In UE-based mode, the UE reports the latitude, longitude, and possibly altitude, together with an estimate of the location uncertainty, if available.
The UE should also report an indication that WLAN method is used and possibly other positioning methods used to calculate the fix.

8.5.3  WLAN Positioning Procedures  p. 108

8.5.3.1  Capability Transfer Procedure  p. 108

The Capability Transfer procedure for WLAN positioning is described in clause 7.1.2.1.

8.5.3.2  Assistance Data Transfer Procedure  p. 108

8.5.3.2.0  General |R18|  p. 108
The purpose of this procedure is to enable the UE to request assistance data from the LMF (e.g., as part of a positioning procedure) and the LMF to provide assistance data to the UE (e.g., as part of a positioning procedure).
8.5.3.2.1  LMF initiated Assistance Data Delivery  p. 108
Figure 8.5.3.2.1-1 shows the Assistance Data Delivery operations for the network-assisted WLAN method when the procedure is initiated by the LMF.
Reproduction of 3GPP TS 38.305, Fig. 8.5.3.2.1-1: LMF-initiated Assistance Data Delivery Procedure
Figure 8.5.3.2.1-1: LMF-initiated Assistance Data Delivery Procedure
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Step 1.
The LMF determines that assistance data needs to be provided to the UE (e.g., as part of a positioning procedure) and sends an LPP Provide Assistance Data message to the UE. This message may include any of the WLAN assistance data defined in clause 8.5.2.1.
8.5.3.2.2  UE initiated Assistance Data Transfer  p. 109
Figure 8.5.3.2.2-1 shows the Assistance Data Transfer operations for the network-assisted WLAN method when the procedure is initiated by the UE.
Reproduction of 3GPP TS 38.305, Fig. 8.5.3.2.2-1: UE-initiated Assistance Data Transfer Procedure
Figure 8.5.3.2.2-1: UE-initiated Assistance Data Transfer Procedure
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Step 1.
The UE determines that certain WLAN assistance data is desired (e.g., as part of a positioning procedure when the LMF provided assistance data are not sufficient for the UE to fulfil the request) and sends a LPP Request Assistance Data message to the LMF. This request includes an indication of which specific WLAN assistance data is requested.
Step 2.
The LMF provides the requested assistance data in a LPP Provide Assistance Data message, if available at the LMF. The entire set of assistance data may be delivered in one or several LPP messages. In this case, this step may be repeated by the LMF several times. If any of the UE requested assistance data in step (1) are not provided in step 2, the UE shall assume that the requested assistance data are not supported, or currently not available at the LMF. If none of the UE requested assistance data in step (1) can be provided by the LMF, return any information that can be provided in an LPP message of type Provide Assistance Data which includes a cause indication for the not provided assistance data.
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8.5.3.3  Location Information Transfer Procedure  p. 109

8.5.3.3.0  General |R18|  p. 109
The purpose of this procedure is to enable the LMF to request position measurements or location estimate from the UE, or to enable the UE to provide location measurements to the LMF for position calculation.
8.5.3.3.1  LMF initiated Location Information Transfer Procedure  p. 110
Figure 8.5.3.3.1-1 shows the Location Information Transfer operations for the WLAN method when the procedure is initiated by the LMF.
Reproduction of 3GPP TS 38.305, Fig. 8.5.3.3.1-1: LMF-initiated Location Information Transfer Procedure
Figure 8.5.3.3.1-1: LMF-initiated Location Information Transfer Procedure
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Step 1.
The LMF sends a LPP Request Location Information message to the UE for invocation of WLAN positioning. This request includes positioning instructions such as the positioning mode (UE-assisted, UE-based, Standalone), specific requested UE measurements if any, and quality of service parameters (accuracy, response time).
Step 2.
The UE performs the requested measurements and possibly calculates its own location. 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.
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8.5.3.3.2  UE-initiated Location Information Delivery Procedure  p. 110
Figure 8.5.3.3.2-1 shows the Location Information delivery operations for the WLAN method when the procedure is initiated by the UE.
Reproduction of 3GPP TS 38.305, Fig. 8.5.3.3.2-1: UE-initiated Location Information Delivery Procedure
Figure 8.5.3.3.2-1: UE-initiated Location Information Delivery Procedure
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Step 1.
The UE sends an LPP Provide Location Information message to the LMF. The Provide Location Information message may include UE WLAN information or location estimate already available at the UE.

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