A Multi-domain and Multi-overlay Framework of P2P IMS Core Network based on Cloud Infrastructure

The key technology of next generation network, IP Multimedia Subsystem ( IMS), lacks of scalability, reliability and load balancing ability because of its traditional centralized control architecture. Using P2P ( peer-to-peer) technology to transform architecture of the traditional IMS core network is a feasible solution, while the function separation and independent operation requirements of IMS network elements in telecommunication career level can not be met. In this paper, we present a multi-domain and multi-overlay framework of P2P IMS core network based on cloud infrastructure. In this framework, various network elements ( NEs) are divided into different domains and overlay of the core network. Experimental results indicate that this framework can be deployed in the actual operating core network and provides core functions. Besides, the service capacity grows linearly as the number of serving nodes increases. The load can be automatically distributed on each element in a balanced way and the maximum load difference between elements is no more than 16%. Moreover, the response time of redesigned procedures is much smaller than the original procedures.