Embodiments of the present disclosure relate to a method and device for identifying a Packet Date Network (PDN) connection for an Internet Protocol (IP) Multimedia Subsystem (IMS) service. In example embodiments, after a serving node in a packet switched core network receives, from a terminal device, a first request for establishing a PDN connection, the serving node determines whether the PDN connection is to be established for an IMS service. If it is determined that the PDN connection is to be established for the IMS service, the serving node stores an identification of the IMS service for the PDN connection for a restoration of the PDN connection at a later instant. Accordingly, in a restoration of the PDN connection at a later instant, the serving node may facilitate only the PDN identified for the IMS service. In this way, the restoration of the PDN connection is more effective and efficiently.