Enhanced position assisted soft handover algorithm for UTRA

We propose an enhanced user position assisted soft handover algorithm for wideband CDMA based UTRA system. The proposed algorithm is based on the UTRA soft handover algorithm and the user´s position information. The estimated user position and projected motion play an assisting role when the network decides to add/remove a base station to/from the user´s active set. The positioning error and positioning delay are modelled. The performance of the proposed algorithm has been compared with that of the UTRA algorithm, by carrying out simulations in UTRA vehicular environment, for various user mobility and propagation conditions. The system performance is evaluated in terms of the system resource efficiency, i.e. mean active set number and active set update rate, and the quality of service, i.e. call outage and blocking probability. The results are presented through graphs and discussed