SATELLITE-UMTS TRAFFIC DIMENSIONING AND RESOURCE-MANAGEMENT TECHNIQUEANALYSIS

The universal mobile telecommunications system (UMTS) will consist of space UMTS (S-UMTS) and terrestrial UMTS (T-UMTS) components. An algor ithm for predicting the traffic capacity in terms of the number of sub scribers for the satellite component of UMTS is presented, The algorit hm takes into account the takeup characteristics of new products, the growth of gross domestic product (GDP), the projection of population, the tariff of the service, and price fall over the forecast period, Th e predicted traffic is used to generate a traffic grid in terms of Erl ang of dimension 36 x 72 in steps of 5 degrees in both the latitude an d longitude directions. The traffic grid is used to evaluate the perfo rmance of a dynamic channel allocation (DCA) technique as well as a fi xed channel allocation (FCA) technique. Both channel allocation techni ques have been considered with the queuing of handover (QH) requests. In order to compare the respective techniques' performance, a low-eart h orbit mobile satellite system (LEO-MSS) mobility model is developed to take into account the effect of satellites' motion during interbeam handovers, A theoretical model for obtaining the values of blocking p robabilities for low-traffic loads is presented, Finally, the performa nce of the DCA-QH technique is compared with the FCA-QH technique unde r suitably defined traffic and mobility conditions.