Mathematical bounds of handover performance in CDMA system

This paper proposes three mathematical bounds of handover performance in CDMA system, Bound1 is the lower bound of hard handover(HHO) performance with variable handover thresholds, Bound2 is the lower bound of soft handover (SHO) performance and also the upper bound of HHO performance with variable handover thresholds, and Bound3 is the upper bound of SHO performance with variable handover thresholds. According to the bounds, the scope of handover performance is divided and limited. In order to form the mathematical basis of the bounds, this paper presents the analyzing methods and the final mathematical expressions of the outage probability in HHO and SHO. By simulating the expressions in the WCDMA (FDD) system, this paper concludes that the relevant expressions are proved to be correct, and it is more appropriate and accurate to utilize the expressions in this paper to evaluate the performance of HHO and SHO in a real CDMA system than Viterbi's (1994) estimates of HHO and SHO.