Mobile system and IP packet transferring method

The invention relates to a system for a mobile communication via a network, wherein a network node is connected with a mobile terminal, wherein the network node (Home Agent, Foreign Agent) transfers an IP packet via a network path determined according to a service class (QoS) corresponding to the IP packet when the mobile terminal moves (i.e. is handed over) to another network node, wherein the mobile terminal notifies the service class to the network node (Home Agent, Foreign Agent) when the mobile terminal moves to the other network node. Furthermore, a method for a mobile communication via a network including a network node (Home Agent, Foreign Agent) connected with a mobile terminal is described with the steps of transferring an IP packet via a network path determined according to a service class corresponding to the IP packet when the mobile terminal moves to another network node, and notifying the service class to the network node when the mobile terminal moves to the other network node.