Patent ID: 7418510

Claim:
A network system comprising: a wire link; a plurality of wireless links; a gateway router, with which a wireless terminal unit is connected through the wireless links and which is connected with the wire link, for setting a communication route from the wireless link directly connected with the wireless terminal unit to the wire link to function as a gateway to the wire link; and one or more access routers, at least one of which connects the gateway router and the wireless terminal unit through the wireless links, for setting a communication route from the wireless link connected with the gateway router to the wireless link connected with the wireless terminal unit, wherein the gateway router sets a communication route from the wireless link connected with the wireless terminal unit to the wire link through the other wireless link or the other wireless links connected with the one or more access routers to function as a gateway to the wire link; wherein one remarked access router is connected through a first wireless link with the gateway router or another access router, the remarked access router searches the gateway router and the other access routers for a non-used wireless link having data transfer capability higher than that of the first wireless link, the connection of the remarked access router through the first wireless link is changed to the connection of the remarked access router with the gateway router or one of the other access routers through the non-used wireless link having data transfer capability higher than that of the first wireless link, the gateway router and the one or more access routers are configured as master devices, while the wireless terminal is configured as a slave device, the communication route includes the changed connection of the remarked access router through the non-used wireless link, and the communication route is set such that every node connecting the wireless terminal to the wire link is a gateway router or access router.