Nowadays the penetration of wireless access is continuously increasing.
Additionally, the mobile users become more and more dependent on data. The
IP-based (Internet Protocol) Internet was designed for data transmission and
has become the most ubiquitous wired internetwork. According to these trends
the next generation networks (and already 3G networks also include IP-based
parts) are designed as a combination of these two types of networks (mobile
and IP-based). The Mobile IP protocol handles mobility in the IP layer
globally, but it is not well-adopted to local coverage areas. Within such
access networks the micro-mobility proposals enhance the performance of
Mobile IP. In this paper we propose a solution for improving the performance
of tree-based micro-mobility protocols by rearranging their capacity using
additional links. Based on analytical considerations we obtain a formula to
determine the optimal link size in particular cases. The method is also
examined with our simulation testbed, the results show improvement in the
performance of the domain
