Patent ID: 8494529

Claim:
A method of controlling a session in a mobile communication network, the method performed by serving server that takes charge of a control plane and comprising: receiving a tracking area update (TAU) request message of a terminal via a target base station; obtaining subscription information indicating that the session for the terminal is to be passed through a path over nodes within a fixed network different from the mobile communication network; determining whether gateway relocation is necessary; releasing a previously established session for the terminal; transmitting an accept message to the terminal via the target base station, the accept message comprising information for a processing result; and establishing a session that passes through the path over the nodes within the fixed network based on the subscription information, wherein the subscription information includes a parameter that is related to Selected Internet Protocol Traffic Offload (SIPTO) and indicates whether the session is allowed for SIPTO, wherein the subscription information is either set together with an access point name (APN) or set in a unit of bearer, and wherein releasing the previously established session comprises releasing at least one session associated with the APN among sessions in which the terminal is performing if the subscription information is set together with the APN.