On the performance evaluation of spectrum sharing algorithms between two UMTS operators

This paper proposes two new algorithms that address spectrum sharing between two Universal Mobile Telecommunication System (UMTS) operators on a pool and non-pooled basis in the UMTS extension band (2500 MHz-2690 MHz). The proposed pool based algorithm exploits the de-correlation in the traffic pattern based on the expected call requests. The non-pool based algorithm takes advantage of the opportunities available on the primary system during capacity limited situations on the secondary system. The simulated performance of the two Dynamic Spectrum Allocation (DSA) algorithms under peak hour loading shows improvement of 4.5% and 11% respectively over Fixed Spectrum Allocation (FSA). It is shown in the pool based algorithm that the DSA gain increases, as the traffic correlation coefficient between the two operators decrease. The results also show that the call setup delay associated with scheme depends on whether the operators share the Radio Network Controller (RNC).