3G IP Multimedia Subsystem(IMS)1.ppt

3GPP IP Multimedia Subsystem Li, XiaoMeng 2009.07.30 What is IMS? Layered, Access Independent, multimedia services delivering IP Core Network. Convergence Fixed and Mobile Convergence (FMC); Manageable Service control; Media resources control policy; Subscriber profile management; Mobility management; Operable Service QoS ensuring Charging plan Secure communication Services creation 3GPP Network Model IMS Entities and Functions IMS Reference Points Protocols IMS-Related Standards Initiatives IMS Functional Elements Session Management (SIP) Routing Databases Network Interoperability Elements Services and Support Components Charging Components Functional Elements (1) Functional Elements (2) Functional Elements (3) IMS Service Routing – the IFCs IMS UE Registration IMS Subscription to UE State Changes IMS Basic Call Flow Initiate SIP invitation Retrieve subscriber profile (if needed) Apply service logic Retrieve address of CLD party home network and forward INVITE Identify registrar of CLD party and forward INVITE Retrieve subscriber profile (if needed) Apply service logic Forward INVITE to CLD party SDP negotiation / resource reservation control Ringing / alerting Answer / connect Session active IMS Basic Call Flow – Interaction with GGSN Cx interface procedures Location management procedures Registration and de-registration. Location retrieval operation. User data handling procedures The download of user information during registration and to support recovery. Update of user data and recovery mechanisms. User authentication procedures IMS Releases * What is IMS? An Industry Standard Service Architecture (SA) and Core Network (CN) architecture An IP Multimedia Services Architecture Defined with Open Standards from 3GPP and ETSI Based on IETF Protocols (SIP, RTP, RTSP, COPS, DIAMETER, etc.) Designed for both Wireless and Wireline Networks and for Fixed and Mobile Convergence (FMC) A Solution for Service Transparency Capable of Interworking with PSTN (i.e. legacy IN