Measurement-based replanning of cell capacities in GSM networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Analysis of a multi-server retrial queue with search of customers from the orbit
Performance Evaluation
Modeling of customer retrial phenomenon in cellular mobile networks
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Performance Analysis of Dedicated Signalling Channels in GERAN by Retrial Queues
Wireless Personal Communications: An International Journal
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In cellular networks, repeated attempts occur as result of user behavior but also as automatic retries of blocked requests. Both phenomena play an important role in the system performance and therefore should not be ignored in its analysis. On the other hand, an exact Markovian model analysis of such systems has proven to be infeasible and resorting to approximate techniques is mandatory. We propose an approximate methodology which substantially improves the accuracy of existing methods while keeping computation time in a reasonable value. 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.