What is Vertical Handover

The cellular industry is evolving at a very fast pace. In fact, cellular networks have experienced significant changes over the last few years. In order to keep up with this constant evolution, planning tools must also adapt in order to reflect the particularities and architecture of each generation. In this chapter, we will first present the characteristics and the architecture of the four main generations of cellular networks (1G, 2G, 3G and 4G). We will then expose different planning problems related to each generation followed by a short description of different solutions that have been proposed in the literature.