Which Parameters helps to reduce TCH Congestion Rate?

Below mentioned parameters may cause TCH Congestion & also help you to reduce TCH Congestion: 1. TCH Traffic Busy Threshold(%) 2. RXLEV_ACCESS_MIN 3. SACCH Multi-Frames and Radio Link Timeout 4. SDCCH Dynamic Adjustment 5. RACH Min.Access Level 6. Speech Version 7. TCH Immediate Assignment 8. Speech Version 9. Fix Abis Prior Choose Abis Load Threshold 10. Assignment Cell Load Judge Enable 11. Flex Abis Prior Choose Abis Load Threshold 12. Directed Retry Load Access Threshold 13. Balance Traffic Allowed 14. Load HO Allowed 15. Load HO Step Period 16. Load HO Step Level 17. Cell Direct Try Forbidden Threshold 18. Direct Retry 19. SDCCH Dynamic Adjustment 20. Direct Retry and Cell Direct Try Forbidden Threshold 21. AMR TCH/H Prior Allowed 22. T3103 23. T3107 24. F2H HO th/ H2F HO th 25. Maximum Ratio Threshold of PDTCH