Main Challenges:
- Interoperability strategy tuning between E-UTRAN and NG-RAN
- High EPS Fallback delay due to N26 Interfaces issues
- SIB24 Activation
Interoperability settings are similar to 4G to 3G parameters; all the following need to be checked and tuned during the initial phase of the network to ensure a smooth transition between 4G & 5G for Idle, Connected, and Fallback services.
- 4G/5G Priority to be tuned, and it is preferred to give higher priority to NR.
- EPS Fallback settings-related parameters must be tuned to minimize the transition timing.
- Reselection, Redirection, and Fast Return settings to be verified and tuned based on network coverage conditions.
- A3 offset and time to trigger for intra-frequency handovers to be tuned based on network requirements.
- N26 Interfaces issue is to be checked and raised to the Core team to avoid additional call setup time.
- SIB24 is to be enabled to ensure cell reselection works from 4G to 5G; however, some devices do not support SIB24.
- Idle/Coverage-based redirection/HO thresholds to be tuned properly to avoid ping-pong reselections/handovers
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