ServiceChord: A Scalable Service Capability Interaction Framework for IMS - Chi-Yuan Chen; Chia-Yin Wu; Shih-Wen Hsu; Han-Chieh Chao; Isaac Woungang; Mohammad S. Obaidat (Proceedings of the Global Communications Conference, GLOBECOM 2011, 5-9 December 2011, Houston, Texas, USA, 2011)