Overflow Priority classification Approximation(OPCA) Impose fictitious preemptive priority structure to a given mode Junior calls Senior calls pply efPa-like algorithm in the fictitious model Better approximation in most cases Increase the proportion of junior calls in the network Reduce overflow error and path errorOverflow Priority classification Approximation (OPCA) • Impose fictitious preemptive priority structure to a given model – Junior calls – Senior calls • Apply EFPA-like algorithm in the fictitious model • Better approximation in most cases – Increase the proportion of junior calls in the network – Reduce overflow error and path error 12