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

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What are the possible causes for an Access Failure in UMTS?      
·         Missing Neighbors
·         Poor Coverage
·         Pilot Pollution / Spillover
·         Poor Cell Reselection
·         Core Network Issues
·         Non – availability of resources. Admission Control denies
·         Hardware Issues
  • Improper RACH Parameters
  • External Interference

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