A model of SDN controllers supporting for processing of flows based on the IMS

The IP Multimedia Subsystem (IMS) is a kind of Multimedia business form and it is an architectural framework for delivering IP multimedia services. In order to increase flexibility and reliability, in this paper we propose a different perspective which maintains the existing IP Multimedia Subsystem (IMS) based signaling platform while processing flow via distributed SDN controllers. Software Define Network (SDN) requires some methods for the control plane to communicate with the data plane. One such mechanism is OpenFlow which is a standard interface for controlling computer networking switches. The OpenFlow protocol can manage resources by slicing them in a virtualized manner and that aspect of the OpenFlow protocol can be integrated in an IMS infrastructure. Under such infrastructure, the IMS is considered to correlate with the OpenFlow controller, and the OpenFlow controller will be able to dynamically reroute the traffic to alternate network resources, or a different `network slice' in cases of congestion or applying QoS in the IMS networks through the IMS policy network.

I. Introduction

The Internet has grown to a point that it interconnects billions of users and machines (everything), the IP Multimedia Subsystem (IMS) plays an important role in next generation network for Public Switched Telephone Network (PSTN) [1] migration, as well as in mobile Long- Term Evolution (LTE) networks. The IMS adopts Session Initiation Protocol (SIP) [2] for session control and all applications are triggered by the IMS core to corresponding SIP Application Servers (AS) during the call process. On the other hand there were no promising applications.