The IP Multimedia Domain in Wireless Networks: Concepts, Architecture, Protocols, and Applications
ISMSE '04 Proceedings of the IEEE Sixth International Symposium on Multimedia Software Engineering
Modeling and Optimization for the Design of IMS Networks
ANSS '06 Proceedings of the 39th annual Symposium on Simulation
A Framework for IMS Interworking Networks with Quality of Service Guarantee
ICN '08 Proceedings of the Seventh International Conference on Networking
Analysis of SIP-Based IMS Session Establishment Signaling for WiMax-3G Networks
ICNS '08 Proceedings of the Fourth International Conference on Networking and Services
IP multimedia subsystems in 3GPP and 3GPP2: overview and scalability issues
IEEE Communications Magazine
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The IP Multimedia Subsystem (IMS) defined by the 3rd Generation Partnership Project (3GPP) and 3GPP2 provides a platform for the provision of multimedia services with quality of service (QoS). In addition, this service architecture allows third-party vendors to create advanced multimedia and multisession services across wireless and wireline network access. The Session Initiation Protocol (SIP) supports the signaling and session management functions of these services; therefore, the SIP performance is critical to the services' quality of experience. Thus, in order to conduct an SIP performance evaluation, an efficient yet representative model for SIP signaling traffic is needed. In this article, we provide an in-depth flow analysis of a number of SIP session procedures defined in IMS and quantify the SIP signaling traffic at flow level. By utilizing the signaling flow analysis, the workload of servers can be predicted with a simple mathematical calculation. The complex correlation structure of the workloads across different signaling servers is naturally captured by the flow concept we introduced. This model also allows for flexibility when expanding the SIP session procedures in IMS networks. According to the simulations that we carried out using OPNET, the model we proposed is proven to be acceptable.