Patent ID: 6955918

Claim:
A method for relocating a serving network entity related to a certain terminal, comprising the steps of: before relocation transmitting certain packet data information between the terminal and a first network entity at least via a second network entity, which is connected to the first network entity with a first path, and via a third network entity, which is connected to the first network entity with a second path and to the second network entity, which is a peer entity of the third network entity, with a third path, which first, second and third paths are separate paths, before the relocation the second network entity is acting as the serving network entity, after the relocation transmitting said information via the third network entity, which is acting as the serving network entity, and a need for serving network entity relocation from the second network entity to the third network entity is detected, wherein the need for relocation is communicated to the third network entity by the second network entity using the third path, and a routing area update procedure is triggering the relocating wherein the terminal is a mobile station, the second network entity and third network entity are entities of a radio access network of a cellular system and the first network entity is a network entity of a core packet network of the cellular system.