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full Contents for  TS 23.288  Word version:   16.3.0

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6.6  Network Performance AnalyticsWord-p. 31
6.6.1  General
With Network Performance Analytics, NWDAF provides either statistics or predictions on the load, communication and mobility performance in an Area of Interest; in addition, NWDAF it may provide statistics or predictions on the number of UEs that are located in that Area of Interest.
The service consumer may be an NF (e.g. PCF, NEF, AF), or the OAM.
The consumer of these analytics may indicate in the request:
  • Analytics ID set to "Network Performance";
  • Target of Analytics Reporting containing either a UE, or Internal Group Identifier that refers to the group for which the analytics on the number of UEs that are located in the Area of Interest at the time indicated in the Analytics target period is requested or any UE;
  • Analytics Filter Information containing:
    • Optionally, maximum number of objects;
    • Area of Interest (list of TA or Cells) which restricts the area in focus (mandatory if Target Of Event Reporting is set to "any UE", optional otherwise);
    • Optionally, the subset of analytics that are requested among those specified in clause 6.6.3;
  • Optionally, Reporting Thresholds, which apply only for subscriptions and indicate conditions on the level to be reached for respective analytics information (see clause 6.6.3) in order to be notified by the NWDAF;
  • An Analytics target period indicates the time period over which the statistics or prediction are requested; and
  • In a subscription, the Notification Correlation Id and the Notification Target Address are included.
The NWDAF notifies the result of the analytics to the consumer as indicated in clause 6.6.3.
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6.6.2  Input Data
The NWDAF collects Load and Performance information in an Area of Interest from the sources listed in Table 6.6.2-1 and number of UEs within Area of Interest from the sources listed in Table 6.6.2-2.
Load information
Source
Description

Status, load and performance information
OAM
Statistics on RAN status (up/down), load (i.e. Radio Resource Utilization) and performance per Cell Id in the Area of Interest as defined in TS 28.552.
NF Load information
NRF
Load per NF

 
Number of UEs information
Source
Description

Number of UEs
AMF
Number of UEs in an Area of Interest

The NWDAF shall be able to collect UE mobility information as stated in clause 6.7.2.2.
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6.6.3  Output AnalyticsWord-p. 32
The NWDAF shall be able to provide both statistics and predictions on Network Performance.
Network performance statistics are defined in Table 6.6.3-1.
Information
Description

List of network performance information (1..max)
Observed statistics during the Analytics target period
> Area subset
TA or Cell ID within the requested area of interest as defined in clause 6.6.1
> gNB status information
Ratio of gNBs that have been up and running during the entire Analytics target period in the area subset
> gNB resource usage
Average usage of assigned resources (CPU, memory, disk)
> Number of UEs
Number of UEs observed in the area subset
> Communication performance
Ratio of successful setup of PDU Sessions
> Mobility performance
Ratio of successful handover

Network performance predictions are defined in Table 6.6.3-2.
Information
Description

List of network performance information (1..max)
Predicted analytics during the Analytics target period
> Area subset
TA or Cell ID within the requested area of interest as defined in clause 6.6.1
> gNB status information
Ratio of gNBs that will be up and running during the entire Analytics target period in the area subset
> gNB resource usage
Usage of assigned resources (CPU, memory, disk) (average, peak)
> Number of UEs
Number of UEs predicted in the area subset
> Communication performance
Ratio of successful setup of PDU Sessions
> Mobility performance
Ratio of successful handover
> Confidence
Confidence of this prediction

NOTE 1:
The predictions are provided with a Validity Period, as defined in clause 6.1.3.
NOTE 2:
The analytics on number of UEs are related to the information retrieved from the AMFs.
The number of network performance information entries is limited by the maximum number of objects provided as input parameter.
The NWDAF provides Network Performance Analytics to a consumer that includes the load in the area of interest and the number of UEs located in the area of interest or both at the time requested by the consumer in the Analytics target period:
  • Analytics ID set to "Network Performance".
  • Notification Target Address including the address of the consumer.
  • Notification Correlation Id, for the consumer to correlate notifications from NWDAF if subscription applies.
  • Analytics specific parameters including the load in the Area of Interest and the number of UEs in the Area of Interest, at the time indicated in the Analytics target period.
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6.6.4  ProceduresWord-p. 33
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Step 1.
The NF sends Nnwdaf_AnalyticsSubscription_Subscribe or Nnwdaf_AnalyticsInfo_Request (Analytics ID="Network Performance", Target of Analytics Reporting, Analytics Filter="Area of Interest", "Reporting Thresholds" and Analytics target Period(s)) to the NWDAF.
Step 2a-2d.
The NWDAF discovers from NRF the AMF(s) belonging to the AMF Region(s) that include(s) the Area of Interest and subscribes to NF load and status information from NRF about these AMF(s).
Step 3a-3b.
The NWDAF subscribes to OAM services to get the status and load information and the resource usage on the Area of Interest in clause 6.6.2, following the procedure captured in Clause 6.2.3.2.
Step 4a-4b.
The NWDAF collects the number of UEs located in the Area of Interest from AMF using Namf_EventExposure_Subscribe service, including the Target of Event Reporting provided as an input parameter (i.e. any UE or Internal Group Identifier).
Step 5.
The NWDAF derives the requested analytics.
Step 6.
The NWDAF sends Nnwdaf_AnalyticsSubscription_Notify or Nnwdaf_AnalyticsInfo_Request response (one or more instances of the n-tuple (Load in Area of Interest and number of UEs, timestamp) SubscriptionCorrelationId, Probability of assertion).
Step 7-8.
A change of network performance information, i.e. change in the load in the area of interest at the observed period, is detected by OAM, or a change in the NF load information is reported by NRF, and is notified to NWDAF.
Step 9.
The NWDAF derives new analytics taking into account the most recent data collected.
Step 10.
When relevant according to the Analytics target period and Reporting Thresholds, the NWDAF provides a notification using Nnwdaf_AnalyticsSubscription_Notify (one or more instances of the n-tuple (Load in Area of Interest and number of UEs, timestamp) SubscriptionCorrelationId, Probability of assertion.
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