By Rebecca Copeland
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Additional info for Converging NGN Wireline and Mobile 3G Networks with IMS: Converging NGN and 3G Mobile (Informa Telecommunications and Media)
At the IP BS level. This is the process that conveys QoS requirements at the IMS application level to the UMTS BS and performs any required end-to-end QoS signaling by interworking with the external network. This process is performed between the IP BS Manager at the UE and the GGSN. QoS signaling mechanisms such as RSVP (Resource ReSerVation Protocol) are only used at the IP BS level. 3 Resource Management in NGN The scope of the Resource Admission Control Subsystem (RACS) has been defined by TISPAN.
Admission Control: authentication, allocation of bandwidth, control priorities. Border Control: selection of breakout point, interworking for IP connections. Media Control: session media connection, Media Server, media gateway to CS networks. Data Management can be considered a sublayer that contains User ID Management and User Mobility Management, including data storage for IMS. The position of the HSS in the Services layer is sometimes disputed. The HSS is a data repository for the network, containing user profiles and session data, supporting admissions, registering, and locating the active session controller for the subscriber.
Chapter 11 describes some of the IMS protocols. 1 The IMS Layered Model The IMS architecture is based on a layered model. These layers can be seen in relation to network layers models. When discussing layers in a network, there can be more than one definition of these layers. 12 IMS three-layer model. 12 depicts the IMS three-layered model, with the Control layer in between the Service layer and the Media layer. The Media control is shown here as a vertical plane linking the applications with the Media Plane.