Course 610: IP Multimedia Subsystem (IMS) Fundamentals

The IP Multi-Media Subsystem (IMS) is an IP multimedia and telephony core network. It is defined by 3GPP and 3GPP2 standards and organizations based on IETF Internet protocols. IMS is access independent as it supports IP to IP session over wireline IP, 802.11, 802.15, WiMAX, CDMA2000, GSM/EDGE/UMTS and other packet data applications.

IMS permits and enhances real time, multimedia mobile services such as rich voice, video telephony, messaging, conferencing and push services by responding to the emerging trend to move toward a common, standardized subsystem. As data services proliferate and the value chain expands, current vertical application platforms are proving insufficient to meet operator needs. IMS represents a standardized, reusable platform providing a better way to experiment with, deploy, integrate, and expand consumer and enterprise voice and data services.

This course provides an advanced technical overview of IMS.  In this course we will discuss various advanced concepts that are integral to the development of IMS and all IP networks.

• Understand concepts behind All-IP Multimedia Networks
• Understand IMS architecture
• Explain IMS reference architecture
• Understand IMS session control, connection control and applications services
• Explore SIP and SDP extensions used in IMS
• Explain IMS services
• Understand IMS Security and QoS

IMS Business Aspects

• Market opportunities
• The IP Multimedia Subsystem (IMS) is the 3GPP
  and 3GPP2
• IMS market trends
• IMS in GSM, CDMA, WiFi and PSTN based networks
• Business case and challenges for IMS
• Delivering value added services enabled by IMS
• Mobile content & delivery
• Push To Services
• Converged Voice Services
• Multimedia Messaging
• Conferencing Messaging
• Response Services
• Service roaming

What is IMS?

• What is a service?
• What is an application?
• Mobile services
• Mobile services by media
• Mobile services by application
• IMS elements
• SIP protocol for session control
• SIP-based Servers for session control, security and routing
• HSS (extension of HLR)
• Service elements and functions
• CAMEL
• IMS resource and media control elements
• Signalling and transport interworking elements
• Session Control in the IMS
• Media Encoding
• Media Transport
• The Instant Messaging Service in the IMS
• Push-To-Talk
• AAA in the IMS
• Security in the IMS
• Policy in the IMS
• Quality of Service in the IMS

Architecture of UMTS IP Multimedia Subsystem (IMS)

• Reference architecture
• Application layer
• Service control layer
• Media layer
• Interfaces and Protocols
• CSCF, HSS, MGCF, and MGW
• P-CSCF, I-CSCF and S-CSCF
• BGCF/MGCF
• IMS-MGW
• MRFC/MRFP
• SCIM, OSA-SCS, IM-SSFAddressing
• Scenarios in UMTS and CDMA2000 IMS
• Registration
• Call origination and termination
• Roaming and Handovers
• Supplementary Services
• Session renegotiation
• IPv6 in UMTS IMS
• External Services (VHE, OSA)
• Service Architecture
• Protocols (SIP+, CAMEL)
• All-IP UTRAN
• Interworking with PSTN and UMTS/CDMA2000 IMS
• Legacy Wireless networks
  
  

IMS scenarios

• Registration
• Call origination and termination
• Charging implications
• Security
• Privacy implications
• Regulatory aspects
• Roaming and handovers
• Quality of service
• Subscription requirements
• Supplementary services