7 Critical Points for Operators in the 5G NSA → SA Migration

5G Standalone (SA) architecture enables operators to unlock the full potential of 5G: ultra-low latency, network slicing, massive IoT, and advanced mobility management. However, the migration from NSA (Non-Standalone) to SA architecture demands fundamental changes across core, RAN, testing processes, and optimization methodologies.

At Telener, we have consolidated the experience gained from projects with operators in Türkiye and the wider region into seven critical themes.

1. Core Network Architectural Transformation

SA architecture runs on the 5G Core (5GC). Unlike EPC-based NSA, it moves to a Service-Based Architecture (SBA) paradigm. This shift mandates containerized deployment of network functions such as AMF, SMF, and UPF, along with API management and new testing methodologies.

2. SSB Configuration on the RAN Side

While NSA relies on an LTE anchor, SA carries all signaling over NR. Dedicated optimization is required around the SSB (Synchronization Signal Block) period, beam management, and PCI planning. At this stage, SSB-RSRP measurement with Nemo Outdoor is critical.

3. Voice Over NR (VoNR) Validation

With the SA migration, voice calls move from VoLTE to VoNR. Codec compatibility and handover scenarios (SA→LTE VoLTE, SA→EPS fallback) must be validated through walk tests performed with Nemo Handy.

4. Slicing Validation

One of SA’s most powerful capabilities is network slicing. Performance KPIs for URLLC, eMBB, and mMTC slices must be measured individually. Actix Analyzer’s slice-based KPI reporting capabilities can be leveraged at this stage.

5. Uplink Performance

SA architecture promises higher uplink throughput than NSA. In practice, however, this requires measurement and optimization. Validation through drive testing is especially important for Carrier Aggregation and MIMO configurations.

6. Roaming Implications

SA roaming is more complex than NSA. While roaming begins among SA operators with a 5GC, fallback scenarios with NSA operators must be clearly defined. The RoamSmart Unified Platform automates document management throughout this process.

7. Test & Optimization Methodology

Traditional drive test methodology is insufficient for SA. New KPI sets must be introduced, with metrics such as SSB-RSRP, SSB-SINR, and CSI-RSRP. With the Nemo Outdoor + Actix Analyzer combination, SA-specific test scenarios can be fully automated.

Conclusion

The NSA → SA migration is not merely a technology upgrade — it is a fundamental transformation of the operator’s testing, operations, and business processes. With the right tools and expert engineering support, this transformation can be significantly accelerated.

At Telener, with 100+ projects of experience across 13 countries, we are by your side throughout this transformation. For detailed information, reach out through our contact form.