IP Multimedia Subsystem (IMS) provides a common control layer over which the services can be easily accessed by fixed and mobile users. In order to guarantee performance to both service providers and end service subscribers, careful management and maintenance within the control layer must be fulfilled. In this paper, we propose a solution that utilizes a controlling entity to track the utilization of hotspot Session Initiation Protocol (SIP) server (i.e., S-CSCF) and to initiate de-registration procedure so that a sufficient number of subscribers at the overloaded S-CSCF are re-associated with the other S-CSCF(s) for subsequent session services. The proposed solution redistributes and smoothes the future traffic load over individual S-CSCF in an automatic manner. The goodness of the proposal is assessed through simulations using OPNET.

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This paper reports the initial results of OPNET simulation modeling of DSL Forum TR.59 and WT92 traffic management capabilities required in BRAS to deliver end-toend IP QoS over an existing DSL access network and emerging architectures. TR.59 extends the role of the BRAS to include congestion management of the access network, provide IP QoS per user downstream and rate limiting upstream. The objective of the simulations and the results reported here is to demonstrate the feasibility of such an extension and to evaluate the efficiency of traffic management mechanisms in enabling the new required capabilities in BRAS.

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