Abstract: A method for dynamically applying a battery saving technology by a terminal is disclosed. The method comprises transmitting a first message requesting an activation of a battery saving technology dynamic service to an authentication server, receiving a second message being a response to the first message from the authentication server, transmitting and receiving data with a base station in a battery saving technology deactivated state, when response information included in the second message comprises authentication success, and at least one application included in the second message is running, and maintaining a battery saving technology activated state when the application included in the second message is not running.

Abstract: The present invention relates to a method of dynamically changing a connection by a terminal in a wireless LAN. The method including determining a change of the connection to another wireless LAN and whether an access point (AP) of the first wireless LAN is the same as an AP of a second wireless LAN by comparing first AP identity determination information received from the first wireless LAN with second AP identity determination information received from the second wireless LAN and transmitting a message for requesting the connection to the second wireless LAN by using a temporary wireless LAN service profile generated on the basis of a wireless LAN service profile for the first wireless LAN, when the AP of the first wireless LAN is the same as the AP of the second wireless LAN.

Abstract: The present invention relates to a method of dynamically changing a connection by a terminal in a wireless LAN. The method including determining a change of the connection to another wireless LAN and whether an access point (AP) of the first wireless LAN is the same as an AP of a second wireless LAN by comparing first AP identity determination information received from the first wireless LAN with second AP identity determination information received from the second wireless LAN and transmitting a message for requesting the connection to the second wireless LAN by using a temporary wireless LAN service profile generated on the basis of a wireless LAN service profile for the first wireless LAN, when the AP of the first wireless LAN is the same as the AP of the second wireless LAN.

Abstract: A method and system for managing an IP address assigned to a mobile station which can be executed in a PDSN or an IWF is provided. When the mobile station is not determined to have used an actual IP address in a dormant state for a certain time period, the actual IP address assigned to the mobile station is repossessed and a virtual IP address is assigned. When the system receives a packet data service request from the mobile station assigned the virtual IP address, the system repossesses the virtual IP address assigned to the mobile station and assigns an actual IP address to the mobile station. The method includes: determining whether a mobile station uses an actual IP address in a dormant state for a certain time period; and repossessing the actual IP address assigned to the mobile station and assigning a virtual IP address by a PDSN or an IWF.