Patent ID: 8036175
Filing Date: 2011-10-11
Classification: H04W

Abstract:
1. A handoff method between a source network to which a terminal is connected in order of a Base Station (BS) and an Access Service Network (ASN), and a target network to which the terminal is connected in order of a Packet Data Service Node (PDSN), a Packet Control Function (PCF) and an Access Network (AN), the method comprising the steps of: sending, by the terminal, a handoff request message with AN information of the target network to the ASN via the BS; forwarding, by the ASN, the handoff request message to the PCF via the PDSN using the AN information; sending, by the PCF, a request for session information to the ASN via the PDSN, upon receipt of the handoff request message; sending, by the PDSN, a request for context information to the ASN; and transferring, by the ASN, the context information to the PDSN and transferring the session information to the AN via the PDSN and the PCF, upon receipt of the session information request and the context information request.