Effect of redials and automatic retrials in cellular networks

In cellular networks, repeated attempts occur as result of user behavior but also as automatic retries of blocked handovers. Both phenomena play an important role in the system performance and therefore should not be ignored in its analysis. An exact Markovian model analysis of such systems has proven to be infeasible and resorting to approximate techniques is mandatory. Using an approximate methodology, a numerical evaluation of the model is carried out to investigate the impact on performance of the parameters related to the retry phenomena. As a result, some useful guidelines for setting up the automatic retries are provided. Finally, we also show how our model can be used to obtain a tight performance approximation in the case where reattempts have a deterministic nature.