NPC MME Network Product Class

In Release 15, several specific enhancements were introduced for the MME function, including support for a dual registration indicator and refined handling for unsupported APNs. The release also defined procedures for storing CE Mode B UE capability, requesting UE Radio Capabilities, and aligning with eNodeB procedures for CP Relocation Indication. Furthermore, it extended the usage of HASH_MME and clarified MME behaviors for specific Diameter error responses and rate control timing.

• Dual registration supported indicator from MME TS 23.401CR3365
• MME handling of unsupported APN TS 23.401CR3392
• Alignment CR for storing CE mode B UE capability in MME TS 23.401CR3378
• MME request for UE Radio Capabilities TS 23.401CR3440
• Storing CE Mode B in MME TS 24.301CR2953
• Starting time of Serving PLMN rate control at the MME TS 24.301CR3146

+ 5 more changes

In Release 16, the MME saw enhancements for emergency services, secondary RAT data reporting clarification, and S1-U data capability handling corrections. It also received updates for security procedures during 5GC interworking in idle mode and refinements to UE status information usage. Furthermore, the release included editorial clarifications on inter-PLMN mobility and the formalization of supported features for combined MME/SGSN network nodes.

• MME Functionality to Control Emergency Call Bearer Support Indicator TS 23.401CR3539
• Clarification of MME handling for secondary RAT data reporting TS 23.401CR3581
• Correction on S1-U data capability indication and handling in the MME TS 24.301CR3190
• MME not using EMM registration status in UE status IE TS 24.301CR3402
• Correction on MME security handling for 5GC interworking in idle mode TS 24.301CR3409
• Removal of Editor's note on inter PLMN mobility under same MME TS 24.301CR3414

+ 1 more changes

In Release 17, the MME function was enhanced with several specific updates. These included ensuring the MME is used in the UE's located country for IoT NTN, applying ARP per local configuration, and correcting EPS bearer QoS handling. Other additions were support for an Alternative IMSI in the MM context, clarifications on UE radio capability handling during paging, the ability to send forbidden TAIs to the UE, and defined procedures for retransmitting TAU requests during certain inter-system changes.

• IoT NTN: Ensure use of MME in the country where UE is located TS 23.401CR3668
• ARP PL applied by MME per local configruation TS 23.401CR3648
• Correction to MME handling EPS bearer QoS TS 23.401CR3670
• Adding Alternative IMSI to the MM Context in the MME TS 23.401CR3677
• Clarification on handling of UE radio capability for paging when MME changes TS 23.401CR3687
• MME sends forbidden TAI(s) to UE TS 23.401CR3708

+ 1 more changes

In Release 18, the MME function was enhanced with specific capabilities for reporting Coarse UE Location Information to the eNB for NB-IoT UEs, including necessary S1AP impacts. Furthermore, it introduced clarifications and handling procedures for ePCO support during inter-MME handovers and for transferred PDNs when moving to an MME that does not support ePCO. The release also defined mechanisms for Lawful Interception identifier availability during Inter-MME and MME-5GS handovers, and refined timer adjustment logic based on UP duration and start time.

• Identifier availability for Lawful Interception during Inter-MME/ MME-5GS handover TS 23.401CR3720
• Applying MME determined unavailability values TS 23.401CR3814
• When MME does not support ePCO for non-IP/ethernet/UAS services TS 24.301CR3914
• Clarification that the MME adjusts different timers based on UP duration and start time. TS 24.301CR3997
• ePCO support handling for a transferred PDN when change to an MME not supporting ePCO TS 24.301CR4041
• Coarse UE Location Information Reporting from MME to eNB for NB-IoT UEs TS 36.300CR1415

+ 1 more changes

In Release 19, the primary new feature for the MME was the introduction of a split MME architecture, which required new procedures like Attach with PDN connection and Path Switch Requests to resume UE connections specifically for this design. The release also included significant clarifications and enhancements for handling Disaster Roaming Services and satellite operations, including MME behavior when a disaster condition ends and reject handling for UEs not supporting satellite functionality. Additionally, it provided corrections and clarifications on existing procedures such as SGs LAU updates, MME/SGSN registration for SMS, and the use of the S&F Monitoring List within the new split architecture.

• Introduction to Split MME architecture TS 23.401CR3800
• Support of Attach with PDN connection for split MME architecture TS 23.401CR3854
• MME behaviour when the disaster condition has ended and the UE maintains a PDN connection for emergency bearer services TS 24.301CR4572
• Clarify MME and HSS behavior on authentication in disaster roaming service TS 29.272CR0888
• Clarification related to terminology and on MME providing list in detach procedure TS 23.401CR3897
• Clarification that the S&F Wait Timer may need to take into account the time to synchronize the UE context between MME-ground and MME-onboard(s) TS 23.401CR3928

+ 11 more changes