Resumen de Study of wcdma cellular systems with non-homogeneous traffic distributions
The thesis has been performed in the framework of the RRM (Radio Resource Management) in WCDMA (Wideband Code Division Multiple Access) systems. In particular, the thesis is focused on guaranteeing the QoS (Quality of Service) in scenarios with traffic non-homogeneous distributions (i.e. with the presence of hotspots) in multi-service environments.
The initial planning of the network is usually designed according to traffic models or data previously retrieved from other geographical areas where the network has been already deployed, from other mobile communication networks (e.g. GSM networks), etc. Clearly the models or the data used by operators to plan the deployment of the network represent reliably the real traffic at some extent, but yet, and taking into account the inherent dynamics of the traffic (i.e. the number of transmitting users, the distribution of the users, the services used, etc.), it can not be assured that the envisaged traffic scenario will be maintained along time. Likewise, the same problem arises when RRM strategies are designed. Hence, even after carrying out a proper planning and a good selection of RRM strategies parameters, the behaviour of the system may not be the optimum due to the variable scenarios appeared during the roll-out. In this context, the possibility to design and implement strategies capable of facing the variability of the scenario (in terms of interference, distance between base station and mobile user, etc.) becomes the key point to improve the performance of the network.
Thus, this dissertation focuses on analysing the effect of traffic non-homogeneous distributions on the performance of the system and so the implications on RRM strategies. Moreover, along the thesis not only the effects of hotspots are highlighted but some RRM strategies proposals are presented to cope with the variability of the traffic by tuning certain system settings (e.g. CAC threshold or pilot power).
