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Content for  TS 23.288  Word version:  17.1.0

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6.11  WLAN performance analytics |R17|Word‑p. 152

6.11.1  General

The NWDAF provides WLAN performance analytics to a service consumer NF. The analytics results are generated based on the data from other 5GC NFs and OAM. The analytics results, provided in the form of statistics or predictions, contain quality and performance of WLAN connection of UE according to UE location and SSID. The consumer can request either one-time or continuous reporting.
The service consumer may be an NF (e.g. PCF).
If a service consumer is PCF, the WLAN performance analytics can be used to update WLANSP as defined in TS 23.503.
The consumer of these analytics may indicate in the request or subscription:
  • Analytics ID set to "WLAN performance";
  • Target of Analytics Reporting: a UE, a group of UEs, or any UE;
  • Analytics Filter Information containing:
    • Area of Interest (list of TA or Cells);
    • SSID(s);
    • BSSID(s); and
    • optional list of analytics subsets that are requested (see clause 6.11.3);
  • An Analytics target period indicates the time period over which the statistics or prediction are requested, either in the past or in the future;
  • Optional maximum number of objects;
  • Preferred level of accuracy of the analytics;
  • Accuracy level per analytics subset (see clause 6.11.3);
  • Preferred order of results for the list of WLAN performance information:
    • ordering criterion: "time slot start", "number of UEs", "RSSI", "RTT" or "Traffic information"; and
    • order: ascending or descending; and
  • In a subscription, the Notification Correlation Id and the Notification Target Address are included.
If the Target of Analytics Reporting is any UE, then the Analytics Filter should at least include Area of Interest or SSID(s) or BSSID(s).
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6.11.2  Input DataWord‑p. 153

For the purpose of generating WLAN performance analytics results, the NWDAF collects the data as listed in Table 6.11.2-1.
Information Source Description
WLAN measurement resultsOAMThe WLAN measurement results per wireless network served by the WLAN AP.
> SSID / BSSID / HESSIDOAMSSID / BSSID / HESSID of the selected WLAN during the period of analysis.
> RSSIOAMMeasured RSSI of the selected WLAN during the period of analysis.
> RTTOAMMeasured RTT of the selected WLAN during the period of interest.
> UE LocationOAMLocation information tagged by UE when it reports WLAN MDT measurement (e.g. Cell ID and/or longitude/latitude if available).
Information on PDU Session for WLAN (1..max)SMFInformation on PDU session for which Access Type is Non-3GPP and RAT Type is TRUSTED_WLAN.
> SSID / BSSIDSMFSSID / BSSID that the PDU session is related to.
> Start time of the PDU Session for WLANSMFThe time stamp that indicates when the existing PDU Session's access type changes to WLAN or when the new PDU Session for WLAN is established.
> End time of the PDU Session for WLANSMFThe time stamp that indicates when the existing WLAN based PDU Session's access type is not WLAN any more or when the PDU Session for WLAN is released.
UE communications (1..max)UPFList of communication time slots
> Communication startUPFThe time stamp that PDU session(s) for WLAN starts.
> Communication stopUPFThe time stamp that PDU session(s) for WLAN ends.
> UL data rateUPFUL data rate of PDU session(s) for WLAN.
> DL data rateUPFDL data rate of PDU session(s) for WLAN.
> Traffic volumeUPFTraffic volume of PDU session(s) for WLAN.
 
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6.11.3  Output AnalyticsWord‑p. 154

The NWDAF generates WLAN performance analytics. Depending on the Analytics Target Period, the output consists of statistics or predictions. The detailed information provided by the NWDAF is defined in Table 6.11.3-1 for statistics and Table 6.11.3-2 for predictions.
Information Description
Area of InterestA list of TAIs or Cell Ids
List of Analytics per SSIDSSIDs of WLAN access points deployed in the Area of Interest
> Time slot entry (1…max)List of time slots during the Analytics target period
>> Time slot startTime slot start time within the Analytics target period
>> DurationDuration of the time slot
>> RSSI (NOTE 1)Measured RSSI
>> RTT (NOTE 1)Measured RTT
>> Traffic Information (NOTE 1)UL/DL data rate, Traffic volume
>> Number of UEs (NOTE 1)Number of UEs observed for the SSID
NOTE 1:
This information element is an analytics subset that can be used in "list of analytics subsets that are requested" and "accuracy level per analytics subset".
 
Information Description
Area of InterestA list of TAIs or Cell Ids
List of Analytics per SSIDSSIDs of WLAN access points deployed in the Area of Interest
> Time slot entry (1…max)List of time slots during the Analytics target period
>> Time slot startTime slot start time within the Analytics target period
>> DurationDuration of the time slot
>> RSSI (NOTE 1)Predicted RSSI
>> RTT (NOTE 1)Predicted RTT
>> Traffic Information (NOTE 1)Predicted UL/DL data rate, Traffic volume
>> Number of UEs (NOTE 1)Number of UEs predicted for the SSID
>> ConfidenceConfidence of the prediction
NOTE 1:
This information element is an analytics subset that can be used in "list of analytics subsets that are requested" and "accuracy level per analytics subset".
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6.11.4  ProceduresWord‑p. 155

Reproduction of 3GPP TS 23.288, Figure 6.11.4-1: Procedure for WLAN performance analytics
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Step 1.
The consumer NF sends a request to the NWDAF for WLAN performance analytics using either the Nnwdaf_AnalyticsInfo or Nnwdaf_AnalyticsSubscription service. The Analytics ID is set to WLAN performance, the target for analytics and the analytics filters are set according to clause 6.11.1. The consumer NF can request statistics or predictions.
The analytics can be requested with the filter information (e.g. Area of Interest or specific SSID(s)). When Area of Interest is provided, the analytics results include WLAN performance information of all SSID(s) located in the Area of Interest. When specific SSID(s) is provided, the analytics results include WLAN performance information of a specific UE or all UE(s) connected to the corresponding SSID(s).
Step 2-3.
The NWDAF subscribes to information related to PDU Session for WLAN (i.e. Access Type is Non-3GPP and RAT Type is TRUSTED_WLAN) from SMF.
Step 4.
The NWDAF collects WLAN measurement data for the period of analysis from the OAM, following the procedure captured in clause 6.2.3.2.
Step 5.
The NWDAF derives requested analytics with the collected data. Analytics output parameters are listed in clause 6.11.3.
Step 6.
The NWDAF provides the requested analytics to the NF, using either the Nnwdaf_AnalyticsInfo or Nnwdaf_AnalyticsSubscription service, depending on the service used at step 1.
Step 7.
If the NF subscribed the analytics at step 1, the NWDAF provides a new analytics when it generated the new output.
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