IMEI RETRIEVAL AND IMEI CHANGE NOTIFICATION IN 5GC-EPC INTERWORKING SCENARIOS

摘要

According to an aspect, there is provided a method of operating a first network node (420; 430; 520; 530; 620; 630; 730; 740) in a first core network of a telecommunication network. The first network node (420; 430; 520; 530; 620; 630; 730; 740) is for managing data relating to subscribers of the first core network, and the telecommunication network further comprises a second core network having a second network node (420; 430; 520; 530; 620; 630; 730; 740) that is for managing data relating to subscribers of the second core network. The method comprises, after a first wireless device identifier for a first subscriber of the first core network and the second core network is changed to a second wireless device identifier, sending (1101) a first message to the second network node (420; 430; 520; 530; 620; 630; 730; 740) indicating the second wireless device identifier for the first subscriber.