Mobile communication systems with multi-layered wireless network using ad hoc network

Wireless ad hoc networks have been studied from several viewpoints. However, the studies have not focused on the relationship between ad hoc networks and other wireless networks or the characteristics of combined networks. This paper describes a mobile radio communication system with multi-layered wireless network that uses ad hoc networks. The major purposes of the proposed system are to obtain anti-shadow fading characteristics and to disperse the traffic in a service area. First, the multi-layered wireless network architecture is described. Then, the spectrum efficiency is given while taking into account the number of hoppings among the ad hoc networks. Finally, as an example of the multi-layered wireless network system, a positioning system with ten times higher accuracy than a conventional PHS (personal handy phone system) based system is introduced.