A method, a system, a network device, a terminal device, and computer programs for controlling a packet data protocol context in a mobile communication system. According to an example embodiment, an enhanced context modification request may be generated at a terminal device of the mobile communication system by adding a preservation information indicating a desired preservation of a packet data protocol context. The enhanced context modification request may be transmitted towards a core network of the mobile communication system, and a context-related decision may be controlled at the core network based on the preservation information.