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In this paper, we give an overview of wireless Networks. Wireless networks provide voice and e-mail. In addition to these interactive multimedia and video conferencing. All of these technologies need large amounts of bandwith to achieve the demanded quality. There is a great demand for multimedia services. The next generation wireless Networks support these broadband multimedia services. In this article the classification of IP and Mobile-IP is given. We explained network layer (Layer 3) deeply. We compared the macro-mobility and micro-mobility structures. We present micro-mobility solutions which are Cellular-IP and HAWAII. And new solutions such as Hierarchical Mobile-IP protocol, Dynamic Hierarchical Mobile-IP (DHMIP) is explained briefly. Also Dynamic Hierarchical Mobile- MPLS (DHMM) is proposed.