Spectrum estimation methodology for next generation wireless systems: introduction and results of application to IMT-2000

In preparation for the next World Radiocommunication Conference (WRC) in 2007, ITU is developing a methodology for calculating the spectrum requirements of further developments of IMT-2000 and systems beyond IMT-2000. This paper describes this new ITU method, which is based on contributions by the WINNER project to a large extent. Special emphasis is laid on describing the method for calculation of the required system capacity, which is based on a M/G/1-FCFS queue with non-preemptive priorities. Furthermore, we present the results of applying the method to an example scenario, which is derived from the scenario used for dimensioning the spectrum currently identified for IMT-2000. The comparison with the results the previously used ITU spectrum requirement estimation method delivered for this scenario leads to the conclusion that the new method delivers reasonable results in the same order of magnitude, but provides a significantly better founded estimate of spectrum requirement