Frequency Selection Area Identity

In Release 15, the MBS (Mission Critical Service) function was newly introduced through the definition of Access Identity 2, which is used by UEs configured for MCS in authorized PLMNs. This allows the network to apply specific unified access control barring parameters for mission-critical access attempts. The release also included UE configuration details for this access identity and introduced an MCS Indicator to support these services.

• UE configuration for AC 11-15 and MCS (access identity 2) TS 24.501CR0083
• MCS Indicator and Access Identity 2 TS 24.501CR0614
• 5G in AT-commands for network registration and PLMN selection TS 27.007CR0543
• New AT command to set access selection preferences for MO SMS over NAS in 5GS TS 27.007CR0580
• Selection of NAS procedures for E-UTRA connected to both EPC and 5GC TS 23.501CR0147
• Clarify the method of configuring the UE to use Access Identity 1 TS 24.501CR0255

+ 96 more changes

In Release 16, the MBS (Frequency Selection Area Identity) function was not a subject of the documented changes. The provided CR titles and grounding context for this release focus on enhancements for network function discovery and selection (e.g., SMF, PCF, NWDAF), analytics-based selection, and access network selection mechanisms, but do not mention any specific updates or introductions related to MBS or Frequency Selection Area Identity.

• CIoT Introduction of CN Selection and Steering TS 23.501CR0896
• ATSSS-SMF and UPF selection TS 23.501CR0761
• Trusted non-3GPP Access Network Selection TS 23.501CR0783
• eSBA communication schemas related to general discovery and selection TS 23.501CR0799
• eSBA communication schemas related to UDM and UDR discovery and selection TS 23.501CR0800
• Use of analytics for SMF selection TS 23.501CR0940

+ 150 more changes

In Release 17, enhancements for MBS (Multicast Broadcast Service) focused on improving service resilience, with new procedures for MBS session restoration upon MB-UPF failure, both with and without restart. Furthermore, the release introduced mechanisms for the restoration of a Broadcast MBS session specifically following an NG-RAN failure. These additions provided more robust continuity for multicast and broadcast sessions in the event of network function or access network failures.

• NWDAF discovery and selection TS 23.501CR2575
• NWDAF discovery and selection based on provided ML models TS 23.501CR2585
• UP path selection enhancement based on analytics info provided by NWDAF TS 23.501CR2586
• NWDAF discovery and selection for model sharing TS 23.501CR2614
• KI #1-1, I-SMF selection TS 23.501CR2634
• Adding some parameters for local NEF selection TS 23.501CR2656

+ 297 more changes

In Release 18, the MBS (Frequency Selection Area Identity) function was enhanced to support V2X services and Broadcast Remote ID, with the introduction of specific 5QIs for V2X message delivery. Additionally, MBS functionality was extended to support UEs using power saving functions. The release also introduced requirements for manual selection, including the addition of PALs (Primary Additional Licensed Spectrum) for this purpose.

• Addition of PALs requirement for manual selection TS 22.261CR0627
• MBS support for Broadcast Remote ID TS 23.256CR0089
• MBS support for V2X services TS 23.287CR0187
• N3IWF selection enhancement for support of S-NSSAI needed by UE TS 23.501CR3707
• Discovery and Selection of the NWDAF Supporting Federated Learning in 5GC TS 23.501CR3772
• KI#4 23.501 AF traffic influence for common EAS, DNAI selection TS 23.501CR3788

+ 261 more changes

In Release 19, the MBS (Multicast Broadcast Service) function introduced new procedures for session resilience and media delivery, specifically a Multicast MBS session restoration procedure for N3mb path failure and enhancements for in-session unicast repair for MBS object distribution. The release also defined new MBS user service and delivery protocols for eMBMS and added features for MBS time synchronization as part of advanced media delivery.

• RVAS with target NF selection enhancement. TS 23.501CR5364
• NF discovery and selection by target PLMN TS 23.501CR5399
• Support of UPF selection according to the conclusion in FS_UPEAS_Ph2 TS 23.501CR5441
• I-SMF selection/insertion based on local offloading allowed indication TS 23.501CR5604
• Support of L-PSA UPF Selection Considering N6 Delay TS 23.501CR5437
• I-SMF selection/insertion based on local offloading allowed indication TS 23.501CR5871

+ 60 more changes

In Release 20, the MBS (Frequency Selection Area Identity) function introduced support for a Dynamic Network Identity, enhancing network selection mechanisms. This allowed for more flexible and policy-driven selection among available PLMN/RAT combinations, particularly for accessing network slices or non-public networks. The update aimed to minimize service interruption and signaling during network changes, leveraging criteria like UE location and configured frequencies.

• Support for Dynamic Network Identity TS 23.501CR6483
• SMF and PCF Selection for UIA_ARC TS 23.501CR6504