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full Contents for  TS 23.288  Word version:   16.3.0

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6.7.3  UE Communication AnalyticsWord-p. 38
6.7.3.1  General
In order to support some optimized operations, e.g. customized mobility management, traffic routing handling, or QoS improvement, in 5GS, an NWDAF may perform data analytics on UE communication pattern and user plane traffic, and provide the analytics results (i.e. UE communication statistics or prediction) to NFs in the 5GC.
An NWDAF supporting UE Communication Analytics collects per-application communication description from AFs. If consumer NF provides an Application ID, the NWDAF only considers the data from AF, SMF and UPF that corresponds to this application ID.
The consumer of these analytics may indicate in the request:
  • The Target of Analytics Reporting which is a single UE or a group of UEs.
  • Analytics Filter Information optionally including:
    • S-NSSAI;
    • DNN;
    • maximum number of objects;
    • Application ID;
    • Area of Interest.
  • An Analytics target period indicates the time period over which the statistics or predictions are requested.
  • Preferred level of accuracy of the analytics (low/high).
  • In a subscription, the Notification Correlation Id and the Notification Target Address are included.
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6.7.3.2  Input Data
The NWDAF supporting data analytics on UE communication shall be able to collect communication information for the UE from 5GC. The detailed information collected by the NWDAF includes service data related to UE communication as defined in the Table 6.7.3.2-1.
Information
Source
Description

UE ID
SMF, AF
SUPI in the case of SMF, GPSI or external UE ID in the case of AF
Group ID
SMF, AF
To identify UE group if available
Internal Group ID in the case of SMF, External Group ID in the case of AF
S-NSSAI
SMF
Information to identify a Network Slice
DNN
SMF
Data Network Name where PDU connectivity service is provided
Application ID
SMF, AF
Identifying the application providing this information
Expected UE Behaviour parameters
AF
Same as Expected UE Behaviour parameters specified in TS 23.502
UE communication (1..max)
UPF, AF
Communication description per application
>Communication start
The time stamp that this communication starts
>Communication stop
The time stamp that this communication stops
>UL data rate
UL data rate of this communication
>DL data rate
DL data rate of this communication
>Traffic volume
Traffic volume of this communication
Type Allocation code (TAC)
AMF
To indicate the terminal model and vendor information of the UE. The UEs with the same TAC may have similar communication behavior. The UE whose communication behavior is unlike other UEs with the same TAC may be an abnormal one.

NOTE:
How NWDAF collects UE communication related data from UPF is not defined in this Release of the specification.
Depending on the requested level of accuracy, data collection may be provided on samples (e.g. spatial subsets of UEs or UE group, temporal subsets of UE communication information).
The application Id is optional. If the application Id is omitted, the collected UE communication information can be applicable to all the applications for the UE.
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6.7.3.3  Output AnalyticsWord-p. 39
The NWDAF supporting UE Communication Analytics provides the analytics results to consumer NFs. The analytics results provided by the NWDAF include the UE communication statistics as defined in Table 6.7.3.3-1 or predictions as defined in Table 6.7.3.3-2.
Information
Description

UE group ID or UE ID
Identifies an UE or a group of UEs, e.g. internal group ID defined in TS 23.501, clause 5.9.7 or SUPI (see NOTE).
UE communications (1..max)
List of communication time slots.
> Periodic communication indicator
Identifies whether the UE communicates periodically or not.
> Periodic time
Interval Time of periodic communication (average and variance) if periodic.
Example: every hour
> Start time
Start time observed (average and variance)
> Duration time
Duration interval time of communication (average and variance).
> Traffic characterization
S-NSSAI, DNN, ports, other useful information.
> Traffic volume
Volume UL/DL (average and variance).
> Ratio
Percentage of UEs in the group (in the case of an UE group).

 
Information
Description

UE group ID or UE ID
Identifies an UE or a group of UEs, e.g. internal group ID defined in TS 23.501, clause 5.9.7 or SUPI (see NOTE).
UE communications (1..max)
List of communication time slots.
> Periodic communication indicator
Identifies whether the UE communicates periodically or not.
> Periodic time
Interval Time of periodic communication (average and variance) if periodic.
Example: every hour.
> Start time
Start time predicted (average and variance).
> Duration time
Duration interval time of communication.
> Traffic characterization
S-NSSAI, DNN, ports, other useful information.
> Traffic volume
Volume UL/DL (average and variance).
> Confidence
Confidence of the prediction.
> Ratio
Percentage of UEs in the group (in the case of an UE group).

NOTE:
When target of analytics reporting is an individual UE, one UE ID (i.e. SUPI) will be included, the NWDAF will provide the analytics communication result (i.e. list of (predicted) communication time slots) to NF service consumer(s) for the UE.
The results for UE groups address the group globally. The ratio is the proportion of UEs in the group for a given communication at a given time and duration.
The number of UE communication entries (1..max) is limited by the maximum number of objects provided as input parameter. The communications shall be provided by order of time, possibly overlapping.
Depending on the list size limitation, the least probable communications on a given Analytics target period may not be provided.
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6.7.3.4  ProceduresWord-p. 40
The NWDAF can provide UE communication related analytics, in the form of statistics or predictions or both, to a 5GC NF.
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Step 1.
5GC NF to NWDAF: Nnwdaf_AnalyticsSubscription_Subscribe (Analytics ID=UE communication analytics, Target of Analytics Reporting=SUPI(s), Analytics Filter=(Application ID, Area of Interest, etc.)).
5GC NF sends a request to the NWDAF for analytics on a specific UE(s), using either Nnwdaf_AnalyticsInfo or Nnwdaf_AnalyticsSubscription_Subscribe service. The analytics type indicated by "Analytics ID" is set to "UE communication". The Target of Analytics Reporting is set to SUPI or a list of SUPI and Analytics Filter may include Application ID and Area of Interest.
Step 2a-b.
NWDAF to AF (Optional): Naf_EventExposure_Subscribe (Event ID, external UE ID, Application ID, Area of Interest).
In order to provide the requested analytics, the NWDAF may subscribe per application communication information, which is identified by Application ID, from AFs for the UE. The Event ID indicates communication report for the UE which is requested by the 5GC NF in the step 1. The external UE ID is obtained by the NWDAF based on UE internal ID, i.e., SUPI. In the case of external AF, the NEF translates the requested Area of Interest into a list of geographic zone identifier(s) as described in clause 5.6.7.1 of TS 23.501.
This step is skipped if the NWDAF already has the requested analytics available or has subscribed to the AF.
Step 2c-d.
NWDAF to SMF: Nsmf_EventExposure_Subscribe (Event ID, SUPI, Application ID, Area of Interest).
In order to provide the requested analytics, the NWDAF subscribes to information of the UE from SMFs as defined in Table 6.7.3.2-1.
Step 2e-f.
NWDAF to AMF: Namf_EventExposure_Request (Event ID, SUPI).
In order to provide the requested analytics, the NWDAF retrieves Type Allocation code from AMF.
NOTE:
The NWDAF determines the SMF serving the UE as described in clause 6.2.2.1.
Step 3.
The NWDAF derives requested analytics, in the form of UE communication statistics or predictions or both.
Step 4.
NWDAF to 5GC NF: Nnwdaf_AnalyticsInfo_Request response or Nnwdaf_AnalyticsSubscription_Notify.
The NWDAF provides requested UE communication analytics to the NF, using either Nnwdaf_AnalyticsInfo_Request response or Nnwdaf_AnalyticsSubscription_Notify, depending on the service used in step 1.
Step 5-7.
If the NF subscribed UE communication analytics at step 1, when the NWDAF generates new analytics, it provides the new generated analytics to the NF.
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