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The IP Multimedia Subsystem (IMS) is envisioned as the next-generation IP-based multimedia system that integrates data, speech, and video network services over both wireless and wireline networks. In this paper, we focus on optimizing the cost of SIP server deployment in an IMS network. To reflect the traffic loads on the servers, a flow-based model is used to characterize the SIP traffic. Formulated as a linear programming problem, the cost optimization involves mapping a logical IMS core network topology into a physical network topology. Three potential mapping strategies are proposed. Each strategy's specific constraints are incorporated into the mathematical formulation of the problem. A numerical example of each strategy is presented, and the discussion on the formulations is provided.
Date of Conference: 19-23 April 2010