An integrated approach for performance modeling and evaluation of soft handoff in CDMA mobile cellular systems

In CDMA mobile cellular networks, wireless quality is improved by soft handoff techniques. However it requires one to hold multiple channels of cells, which is likely to increase call blocking at wired channels. It is therefore necessary to consider the entire system including the wired and wireless portions of CDMA mobile cellular systems for investigating the effectiveness of the soft handoff. For this, we develop an analytical method to derive the blocking and forced termination probabilities as performance measures for wired channels, and outage probability for wireless ones. Through numerical examples, we evaluate the effects of the size of the soft handoff region. The effect of call control is also shown to reduce the total interference on wireless channels.