5G_RACH_SSR_KPI_vs_Parameters_Impact.pptx

5G KPI

1. 5G RACH SSR KPI vs Parameters Impact Accessibility KPI Optimization in 5G Networks

2. Introduction • RACH (Random Access Channel) is the entry procedure for UEs. • RACH SSR (Success Rate) is a key 5G Accessibility KPI. • High SSR ensures smooth call/session establishment.

3. RACH SSR KPI Definition Formula: RACH SSR = (Successful RACH Attempts / Total RACH Attempts) × 100 Target: Typically > 98% in optimized networks.

4. Parameters Influencing RACH SSR • PRACH Configuration Index • Number of RACH Preambles • Preamble Power Offset • Backoff Indicator • Contention Resolution Timer • Max RACH retries (preambleTransMax) • Beamforming & Coverage parameters

5. Parameter vs Impact Table Parameter Impact on RACH SSR Optimization Strategy PRACH Config Index Affects time/freq resources Choose based on traffic load No. of Preambles Too low → collisions; Too high → wasted resources Balance allocation Preamble Power Too low → misses; Too high → interference Tune with coverage Backoff Indicator Large → delays; Small → collisions Optimize per load Contention Resolution Timer Too short → failures Set per vendor guidelines PreambleTransMax Higher → more retries, load Adjust with SSR trend

6. Graph Example RACH SSR improves with optimized number of preambles.

7. Case Study Example • Low SSR (90%) observed due to high RACH collisions. • Optimization applied: - Increased number of preambles - Tuned preamble power • Result: SSR improved to 98%.

8. Best Practices • Adaptive RACH parameter setting. • Coverage & interference optimization. • Monitor SSR per cell & apply fine-tuning. • Use SON features for dynamic RACH tuning.

9. Conclusion • RACH SSR is a critical accessibility KPI. • Influenced by PRACH configs, power, and retries. • Balanced parameter optimization ensures >98% SSR. • Direct impact on network accessibility & user experience.