Patent ID: 8165089
Filing Date: 2012-04-24
Classification: H04W

Abstract:
1. A method for performing handoff between a source system and a target system having a different network access standard from that of the source system, the method comprising: transmitting, by an access terminal connected to the source system, a request message including an identifier of the access terminal to be identified in the target system, to the target system, via the source system, in order to access the target system; acquiring, by a session storage of the target system, the identifier of the access terminal, from the access terminal, via the source system; acquiring, by the session storage of the target system, session information of the access terminal from an old session storage of the source system to which the access terminal was connected and the old session storage is searched using the identifier of the access terminal, before it accesses the source system; acquiring, by a gateway of the target system, context information related to a data service of the access terminal from a gateway of the source system, after the session information is acquired; assigning, by the session storage of the target system, a new identifier, by which the access terminal is to be identified in the target system, to the access terminal, using the identifier of the access terminal, before providing the data service, after the session information and the context information are acquired; and providing, by the target system, the data service to the access terminal using the session information and the context information, after handoff of the access terminal.