5G and 4G Interworking
This course seeks to explain how interworking can be supported between 5G and 4G networks, with focus on Dual Registration as one technique, coupled with N26 connectivity as an alternative technique. In so doing, both idle and connected mode mobility will be examined, with analysis of an N26 Handover for 5GC to EPC mobility, and vice versa. The course also includes focus on EPS and RAT Fallback mechanisms available for voice, including Emergency Services Fallback.
5G and 4G Interworking
Topic areas covered include:
- Interworking with LTE:
- Interworking Key Concepts.
- Single and Dual Registration Mode.
- Single and Dual Registration Mode Mobility:
- 5GC to EPC Mobility (Dual Registration Mode).
- EPC to 5GC Mobility (Dual Registration Mode).
- Mobility with Single Registration Mode Supported.
- Architectural Considerations:
- Architecture for 5G and 4G Interworking.
- N26 Reference Point.
- Idle Mode Mobility Procedures (with N26):
- 5GC to EPC Mobility (Single Registration, Idle Mode).
- EPC to 5GC Mobility (Single Registration, Idle Mode).
- 4G GUTI to 5G-GUTI Mapping.
- 5GS to EPS Handover:
- Scenario.
- Procedure.
- EPS to 5GS Handover:
- Scenario.
- Procedure.
- Fallback Mechanisms:
- EPS and RAT Fallback.
- High Level Fallback Procedure.
- Emergency Services Fallback.