The application of the Erlang's Ideal Grading for modelling of UMTS cells

The present article proposes an analytical model of the WCDMA radio interface that is based on the concept of Erlang's Ideal Grading (EIG) with multi-rate traffic. The proposed approach is very simple and makes it possible to include in the calculations the interference influence from other cells of the UMTS network through a determination of appropriate values of the availability parameter. The results of the analytical calculations for cells of the UMTS network are compared with the data obtained in a computer simulation. The present study confirms the usability of the EIG model for the analysis of radio interfaces limited by the influence of interference.