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The process of changing the channel associated with the
current connection while a call is in progress is under consideration. The
estimation of dropping rate in handover process of a one dimensional traffic
system is discussed. To reduce the sample size of simulation, dropping calls at
base station is considered as rare event and simulated with importance sampling
- one of rare event simulation approaches. The simulation results suggest the
sample size can be tremendously reduced by using importance sampling.
This paper investigates the steady-state behavior of a semiconductor laser subject to arbitrary levels of external optical feedback by means of an iterative travelling-wave (ITW) model. Analytical expressions are developed based on an iterative equation. We show that, as in good agreement with previous work, in the weak-feedback regime of operation except for a phase shift the ITW model will be simplified to the Lang-Kobayashi (LK) model, and that in the case where this phase shift is equal to zero the ITW model is identical to the LK model. The present work is of use in particular for distinguishing the coherence-collapse regime from the strong-feedback regime where low-intensity-noise and narrow-linewidth laser operation would be possible at high feedback levels with re-stabilization of the compound laser system.