Content for  TS 23.288  Word version:  18.4.0

NWDAF supporting UE mobility statistics or predictions shall be able to collect UE mobility related information from NF, OAM and to perform data analytics to provide UE mobility statistics or predictions. The service consumer may be a NF (e.g. AMF, SMF or AF). The consumer of these analytics may indicate in the request:

• Analytics ID = "UE Mobility".
• Target of Analytics Reporting: a single UE (SUPI) or a group of UEs (an Internal Group ID);
• Analytics Filter Information optionally containing:
  • Area of Interest (AOI): restricts the scope of the UE mobility analytics to the provided area. If the request is for fine granularity location information (i.e. with a finer granularity than cell), the AOI may be described as shown in clause 5.5 of TS 23.273;
  • Visited Area(s) of Interest (visited AOI(s)): additional filter to only consider UEs that are currently (i.e. now) in the "AOI" and had previously (i.e. in the "Analytics target period") been in at least one of the Visited AOI(s). If this parameter is provided, the Analytics target period shall be in the past (i.e. supported for statistics only);
  • Linear distance threshold: An event where the UE moves by more than some predefined straight line distance from a previous location as per TS 23.273. The consumer can provide more than one value of Linear distance threshold.
  • an optional list of analytics subsets that are requested (see clause 6.7.2.3);
• An Analytics target period indicates the time period over which the statistics or predictions are requested;
• Optionally, maximum number of objects;
• Preferred level of accuracy of the analytics;
• Optionally, Preferred level of accuracy per analytics subset (see clause 6.7.2.3);
• Preferred order of results for the time slot entries: ascending or descending time slot start;
• Optionally, preferred granularity of location information: TA level or cell level "longitude and latitude level";
• Optionally, Preferred orientation of location information: ("horizontal", "vertical", "both");
• Optionally, Spatial granularity size and Temporal granularity size;
• UE Location order indicator: indicates the NWDAF should derives and provides the UE Mobility analytics for UE Location in time order; and
• In a subscription, the Notification Correlation Id and the Notification Target Address are included.

The NWDAF supporting data analytics on UE mobility shall be able to collect UE mobility information from OAM, 5GC and AFs. The detailed information collected by the NWDAF could be MDT data from OAM, network data from 5GC and/or service data from AFs:

• UE mobility information from OAM is UE location carried in MDT data;
• Network data related to UE mobility from 5GC is UE location information, UE location trends or UE access behaviour trends, as defined in the Table 6.7.2.2-1;

• Service data related to UE mobility provided by AFs is defined in the Table 6.7.2.2-2;

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 location information).

The NWDAF supporting data analytics on UE mobility shall be able to provide UE mobility analytics to consumer NFs or AFs. The analytics results provided by the NWDAF could be UE mobility statistics as defined in Table 6.7.2.3-1, UE mobility predictions as defined in Table 6.7.2.3-2:

The results for UE groups address the group globally. The ratio is the proportion of UEs in the group at a given location at a given time. The number of time slots and UE locations is limited by the maximum number of objects provided as part of Analytics Reporting Information. The time slots shall be provided by order of time, possibly overlapping. The locations shall be provided by decreasing value of ratio for a given time slot. The sum of all ratios on a given time slot must be equal or less than 100%. Depending on the list size limitation, the least probable locations on a given Analytics target period may not be provided. If a UE Location order indicator is included in the Analytics Reporting information, the NWDAF does not aggregate the UE locations in a long duration but provides the UE locations one by one in their own time period, i.e. the "UE location (1..max)" in the UE Mobility analytics has only one UE location (TA, Cell or a finer granularity UE Location smaller than cell) which indicates the UE is located in this UE location in the duration from the time slot start (i.e. time stamp when the UE enters this location as described in clause 6.7.2.2).

The NWDAF can provide UE mobility related analytics, in the form of statistics or predictions or both, directly to another NF. If the NF is an AF and when the AF is untrusted, the AF will request analytics via the NEF and the NEF will then convey the request to NWDAF.