| 摘要 |
A tunnel termination gateway (TTG) for a mobile network comprises a) processing means (MT) responsible, if they receive an end-to-end tunnel establishment request sent by a mobile station (MS) at the time of an attempt to transfer from the mobile network to a wireless local area network a communication session relating to a service involving that mobile station (MS) and SGSN and GGSN nodes of the mobile network, i) to generate a message to an AAA server (SA) of the mobile network requesting location information for the SGSN node, and ii) in the case of reception of a tunnel establishment authorization and location information from the AAA server (SA), to generate a message to the SGSN node requesting the service context of the mobile station (MS), and b) tunnel establishing means (MET) responsible, when they receive the context, for establishing the end-to-end tunnel with the mobile station (MS) and a tunnel with the GGSN node, in order to ensure the continuity of the service during the communication session transfer. |
