What are the possible causes for an Access Failure in UMTS?

RF Optimization Sekedar catatan yg ditemukan. Access failure di UMTS disebabkan oleh sbb :

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Posted: 04 Apr 2012 05:30 PM PDT

• Missing Neighbors (solusi create neighbours)
• Poor Coverage (solusi atur tilting, atur azimuth bila perlu, tambah cpich power)
• Pilot Pollution / Spillover ( atur cpich power atau agar ada pilot yg dominan)
• Poor Cell Reselection (cek site sekitar,
• Core Network Issues (
• Non – availability of resources. Admission Control denies (cek capacity,
• Hardware Issues (cek hardware,ganti/perbaiki)
• Improper RACH Parameters
• External Interference (scanning freq, retune)

silahkan bila ada yg ingin menjelaskan lebih detil solusi-solusinya di dalam kurung, maklum ane masih newbie untuk optim.

Thanks