Communication Network System and Mobile Terminal

Abstract

An identification-information extracting unit extracts first identification information of a location registration area of a wireless communication system. A storage unit stores correspondence information concerning a relationship between the first identification information and second identification information of a location registration area managed by a communication network system. A location-registration requesting unit transmits location-registration request information for requesting a location registering device to perform a new location registration when the second identification information is updated by a movement of a mobile terminal.

1 . A location registration method employed in a mobile terminal communicating with a base station, the location registration method comprising:
 a first reception step of receiving a location registration identifier specific to an area corresponding to the base station from the base station;   a determination step of determining whether the received location registration identifier is present in a first identification information list, which stores therein the location registration identifiers in advance;   a first transmission step of transmitting a location-registration request message to a controller by way of the base station, when determining that the received location registration identifier is not present in the first identification information list at the determination step;   a second reception step of receiving a second identification information list from the controller as a location-registration response message; and   an update step of storing the received second identification information list.   
     
     
         2 . The location registration method according to  claim 1 , wherein
 the second identification information list is updated by the controller based on the location-registration request message.   
     
     
         3 . The location registration method according to  claim 1  or  2 , wherein
 the second identification information list is added to the location-registration response message and transmitted to the mobile terminal. 
 
     
     
         4 . The location registration method according to any one of  claims 1  to  3 , wherein
 the first identification information list is deleted when the second identification information list is stored. 
 
     
     
         5 . The location registration method according to any one of  claims 1  to  4 , wherein
 the controller is a paging agent.