**6. Conclusions**

There are two parts in this chapter: a theoretical one and an application one. In the theoretical part, we consider four strategies for call admission control (CAC) in single and two-tier cellular networks, which are designed to ensure priority of handover calls, namely: dynamic reservation (cutoff priority scheme), fractional dynamic reservation (fractional guard channel scheme), static reservation (fixed division-based CAC scheme) and restriction on the number of simultaneous new calls admitted (new call bounding scheme). We show the advantage of dynamic reservation by numerical analysis and strictly prove it in the case of two-channel system with blocking.

The application part deals with Equivalent Random Traffic method for multi-tier networks dimensioning. The key result is an extension of the Equivalent Random Traffic method for estimation of the throughput for networks with traffic splitting and correlated streams. The excellent accuracy (relative error less than 1%) is illustrated by numerical examples.
