Lost Capacity of the UMTS Radio Access Network

The theoretical capacity models for the downlink and the uplink of the UMTS radio access network have been researched ever since the UMTS started to be considered. However, they were often based on idealistic assumptions and addressed a static situation. Because of that results were too optimistic. Real networks are not that ideal, as some model suggested. The source of the non-ideality are dynamically changing network properties that are not taken into account in the static models. We explain how those dynamic processes can influence system performance, we define the ineffective load and we update the models to take it into account. The models are supported by simulation results to help comprehend the presented problem. Furthermore, a possible method to estimate such outage in a real network is proposed and ways to minimize the negative impact of the outage discussed.