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Content for  TS 23.288  Word version:  19.0.0

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6.2.6.3 Data Collection using DCCF  6.2.6.3.1 General  6.2.6.3.2 Data Collection via DCCF 
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6.2.6.3  Data Collection using DCCF  p. 91

6.2.6.3.1  General  p. 91
This clause specifies procedures for data collection using the DCCF described in clause 5A for cases other than obtaining analytics from an NWDAF (which is specified in clause 6.1.2). Two options are supported: data delivered via the DCCF, according to clauses 6.2.6.3.2 and 6.2.6.3.3 and data delivered via a messaging framework according to clauses 6.2.6.3.4 and 6.2.6.3.5. Which option to be used is determined by DCCF configuration.
Due to e.g. UE mobility, the source DCCF or MFAF may no longer be able to serve the UE. In such cases, the data consumer may select a new DCCF as described in clause 6.2.6.3.7, or source DCCF may execute the DCCF relocation procedure as described in clause 6.2.6.3.8. The data consumer may indicate in the subscription request whether the DCCF should execute the relocation procedure or send a notification to the data consumer as specified in the reselection procedure. If the data consumer does not send an indicator in the subscription request allowing DCCF relocation initiated by the DCCF the consumer may execute DCCF reselection based on internal logic.
When data is collected for a group of UEs identified by an Internal-Group-Id or any UE, the procedure of DCCF relocation initiated by the DCCF is not applicable. In such case, the consumer may select one or more Target DCCFs and initiate a new subscription for the UEs.
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6.2.6.3.2  Data Collection via DCCF  p. 91
The procedure depicted in Figure 6.2.6.3.2-1 is used by a data consumer (e.g. NWDAF) to obtain data and be notified of events via the DCCF using Ndccf_DataManagement_Subscribe service operation. Whether the data consumer directly contacts the Data Source or goes via the DCCF is based on configuration of the data consumer.
Reproduction of 3GPP TS 23.288, Fig. 6.2.6.3.2-1: Data Collection via DCCF
Figure 6.2.6.3.2-1: Data Collection via DCCF
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Step 1.
The data consumer subscribes to data via the DCCF by invoking the Ndccf_DataManagement_Subscribe (Service_Operation, Data Specification, Formatting Instructions, Processing Instructions, NF (or NF-Set) ID, ADRF Information) service operation as specified in clause 8.2.2. The data consumer may specify one or more notification endpoints. If data to be collected is subject to user consent: if the data consumer checked user consent, the data consumer shall provide user consent check information (i.e. an indication that it has checked user consent), otherwise, the data consumer shall provide a purpose for the data collection.
Service_Operation is the service operation to be used by the DCCF to request data (e.g. Namf_EventExposure_Subscribe or OAM Subscribe). Data Specification provides Service Operation-specific parameters (e.g. event IDs, UE-ID(s), target of event reporting) used to retrieve the data. Formatting and Processing Instructions are as defined in clause 5A.4. The data consumer may include the Data Source, e.g. NF Instance (or NF Set) ID from which the data needs to be collected. The data consumer may include ADRF information indicating whether the data are to be stored in an ADRF and optionally an ADRF ID.
Step 2.
The DCCF checks if data is to be collected for a user, i.e. SUPI or GPSI, then, depending on local policy and regulations, the DCCF checks the user consent by retrieving the user consent information from UDM using Nudm_SDM_Get including data type "User consent" and taking into account purpose for data collection as provided in step 1. If user consent is not granted, DCCF does not subscribe to event exposure for events related to this user, the data collection for this SUPI or GPSI stops here and DCCF sends a response to the data consumer indicating that user consent for data collection was not granted. If the user consent is granted, the DCCF subscribes to UDM to notifications of changes on subscription data type "User consent" for this user using Nudm_SDM_Subscribe.
If the data consumer is NWDAF and it provides user consent check information (i.e. an indication that it has checked user consent) in Ndccf_DataManagement_Subscribe in step 1, which has been obtained by the NWDAF from UDM before, then the DCCF can do data collection for a user based on the user consent information from the NWDAF and skip retrieving it from UDM.
Step 3.
The DCCF determine the NF type(s) and/or OAM to retrieve the data based on the Service Operation requested in step 1. If the NF instance or NF Set ID is not provided by the data consumer. the DCCF determines the NF instances that can provide data as described in clause 5A.2 and clause 6.2.2.2. If the consumer requested storage of data in an ADRF but the ADRF ID is not provided by the data consumer, or the collected data is to be stored in an ADRF according to configuration on the DCCF, the DCCF selects an ADRF to store the collected data.
Step 4.
The DCCF determines whether the data requested in step 1 are already being collected, as described in clause 5A.2.
If the data requested are already being collected from the Data Source by a data consumer, the DCCF adds the data consumer to the list of data consumers that are subscribed for these data, then the DCCF determines that no subscriptions to the Data Source need to be created or modified.
Step 5.
If the data subscribed in step 1 partially matches data that are already being collected by the DCCF from a Data Source and a modification of this subscription to the Data Source would satisfy both the existing data subscriptions as well as the newly requested data, the DCCF invokes Nnf_EventExposure_Subscribe (Subscription Correlation ID) with parameters indicating how to modify the previous subscription (as specified in clause 5A.2). The DCCF adds the data consumer to the list of data consumers that are subscribed for these data. If some of the newly requested data can only be provided by new Data Source, the DCCF creates new subscription(s) to the new Data Source for the newly requested data.
If the data requested at step 1 are not already available or not being collected yet, the DCCF subscribes to data from the NF using the Nnf_EventExposure_Subscribe service operation as specified in clause 5A.2 and clause 6.2.2.2, with DCCF indicated as Notification Target Address. The DCCF adds the data consumer to the list of data consumers that are subscribed for these data.
Step 6.
When new output data are available, the Data Source uses Nnf_EventExposure_Notify to send the data to the DCCF.
Step 7.
The DCCF uses Ndccf_DataManagement_Notify to send the data to all notification endpoints indicated in step 1. Data sent to notification endpoints may be processed and formatted by the DCCF so they conform to delivery requirements for each data consumer or notification endpoint as specified in clause 5A.4. The DCCF may store the information in ADRF if requested by the consumer or if required by DCCF configuration, using procedure as specified in clause 6.2B.3.
Step 8a.
If DCCF needs to retrieve data from OAM, procedure for data collection from OAM as per steps 1-4 from clause 6.2.3.2 is used.
Step 8b.
The DCCF uses Ndccf_DataManagement_Notify to send the data to all notification endpoints indicated in step 1. Data sent to notification endpoints may be processed and formatted by the DCCF, so they conform to delivery requirements for each data consumer or notification endpoint as specified in clause 5A.4. The DCCF may store the information in ADRF if requested by the consumer or if required by DCCF configuration, using procedure as specified in clause 6.2B.3.
Step 9.
If a Ndccf_DataManagement_Notify contains a fetch instruction, the notification endpoint sends a Ndccf_DataManagement_Fetch request to fetch the data from the DCCF.
Step 10.
The DCCF delivers the data to the notification endpoint
Step 11.
The UDM may notify the DCCF on changes of user consent at any time after step 2. If user consent is no longer granted for a user for which data has been collected and there are no other consumers for the data, the DCCF shall unsubscribe to any Event ID to collect data for that SUPI or GPSI. The DCCF shall further update or terminate affected subscriptions of the Data Consumer. The DCCF may unsubscribe to be notified of user consent updates from UDM for each SUPI for which user consent has been revoked.
Step 12.
When the data consumer no longer wants data to be collected it invokes Ndccf_DataManagement_Unsubscribe (Subscription Correlation ID), using the Subscription Correlation Id received in response to its subscription in step 1. The DCCF removes the data consumer from the list of data consumers that are subscribed for these data.
Step 13.
If there are no other data consumers subscribed to the data, the DCCF unsubscribes with the Data Source.
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