US Patent 7336631 Radio network system and radio communication control method

It is aimed to obtain a radio network system in which load sharing among a plurality of Radio Bearer Servers which performs data transfer control between a user plane (Bearer Plane) and a mobile terminal can be efficiently performed. In the radio network system, the plurality of Radio Bearer Servers always notifies a plurality of Radio Control Servers of a resource (channel) using state, and a Radio Control Server (6a) which controls receiving a new call assigns the new call to a Radio Bearer Server (4a) whose resource (channel) has the largest empty space, by judging a using state of each Radio Bearer Server based on the resource (channel) using states.