ABSTRACT
As advent of recent wireless communication technology, many applications on various fields such as public wireless networks, disaster information networks, or intelligent traffic transportation systems are developed [1-3]. In particular, wireless communication system plays a very important role as disaster use. In fact, in the Great East Japan Earthquake on March 11, 2011, the communication access networks to the Internet in disaster areas were recovered by the 3G mobile communication vehicles and satellite communication system. However, those used networks were introduced individually and operated by each of the mobile phone companies; some mobile phones could not be used on different company’s network. The handover function between the different company’s networks
could not be supported even though one network is very congested and the others have enough available network resources.
