IMS-based P2P streaming service system

IP Multimedia Subsystem (IMS) not only inherits the telecom advantages, but also brings several disadvantages, such as poor scalability, single point of failure, etc. Peer-to-Peer (P2P) network has the advantage of scalability and robustness, but there are some difficulties in the peer management and route optimization. By reusing the mechanism of signaling control and media negotiation in IMS, P2P technology is introduced into streaming service and an IMS-based P2P streaming service system is given without any modification to original standard IMS architecture. Compared with IMS-based IPTV architecture defined by ETSI TIAPAN, several functional entities of overlay manage function (OMF), resource manage function (RMF) and digital right manage function (DRMF) are added, and the function of MCF and SCF is also extended. Based on the UE classification, the signaling flows and the QoS guarantee are described. Furthermore, this paper analyzes the advantages of the proposed architecture for solving free-rider phenomenon, serving peer selection, routing optimization and copyright infringement in P2P networks.