A multi-rate loss model for OCDMA PONs

We propose a new teletraffic loss model for the calculation of blocking probabilities in an OCDMA Passive Optical Network (PON) configuration that supports multiple service-classes according to the parallel mapping technique of data rate differentiation. Our analysis includes parameters related to both the local and hard blocking, as well as to Multiple Access Interference and user activity. We form a two-dimensional Markov chain, and solve it to derive recursive formulas for the efficient calculation of blocking probabilities. To evaluate the proposed model, the analytical results are compared with simulation results. The comparison reveals that the accuracy of the proposed analysis is quite satisfactory.