selected publications academic article IMS – the IP Multimedia System as NGN Service Delivery Platform. Elektrotechnik Und Informationstechnik. 2006 conference paper The PCC Rule in the 3GPP IMS Policy and Charging Control Architecture. . 2008 Towards Autonomic Communication Mechanisms for Service Composability Management. . 2008 The role of open ims testbeds in complex service delivery platforms. . 2007