What is IMS?

What is IMS?IP Multimedia Subsystem Series

IMS Resources

• 3rd Generation Partnership Project (3GPP) unites telecommunications standard development organizations;

• IMS specification began in 3GPP Release 5 as part of the core network evolution from circuit-switching to packet-switching and was refined by subsequent Releases;

• http://www.3gpp.org/technologies/keywords-acronyms/109-ims

IMS Resources

• Telecommunications and Internet converged Services and Protocols for Advanced Networking;

• Key standardization body in creating the Next Generation Networks (NGN) specifications;

• Adopt the 3GPP IMS (IP Multimedia Subsystem) standard for SIP-based applications, but also add further functional blocks and subsystems;

• http://www.etsi.org/tispan/

IMS Resources

• Internet Engineering Task Force;

• 3GPP IMS use Internet Protocol, which have been traditionally standardized by the IETF. Therefore, 3GPP collaborate with IETF in developing protocols that fulfills their requirement;

• Technical documents produced by IETF are called RFCs. Only when a particular Internet-Draft becomes an RFC can it be considered a stable specification.

• http://www.ietf.org/

IMS Concept

• The IP Multimedia CN (Core Network) subsystem comprises all CN elements for provision of multimedia services. This includes the collection of signalling and bearer related network elements as defined in TS 23.002 [1]. IP multimedia services are based on an IETF defined session control capability which, along with multimedia bearers, utilises the IP-Connectivity Access Network (this may include an equivalent set of services to the relevant subset of CS Services);

• Source: 3GPP TS 23.228 V12.5.0 (2014-06);

IMS Concept (Cont’d)

• In order to achieve access independence and to maintain a smooth interoperation with wireline terminals across the Internet, the IP multimedia subsystem attempts to be conformant to IETF "Internet standards". Therefore, the interfaces specified conform as far as possible to IETF "Internet standards" for the cases where an IETF protocol has been selected, e.g. SIP;

• Source: 3GPP TS 23.228 V12.5.0 (2014-06);

IMS Concept (Cont’d)

• The IP multimedia core network (IM CN) subsystem enables PLMN operators to offer their subscribers multimedia services based on and built upon Internet applications, services and protocols. There is no intention here to standardise such services within the IM CN subsystem, the intention is that such services will be developed by PLMN operators and other third party suppliers including those in the Internet space using the mechanisms provided by the Internet and the IM CN subsystem. The IM CN subsystem should enable the convergence of, and access to, voice, video, messaging, data and web-based technologies for the wireless user, and combine the growth of the Internet with the growth in telecommunications;

• Source: 3GPP TS 23.228 V12.5.0 (2014-06);

IMS Architecture (Simplified)

GPON xDSL

IP Multimedia Subsystem Core

Service

Session Control

Transport

Access

Legacy Network Architecture (Silo)

Access

3/2G

Transport

Control

Database

Billing

Service

WiMAX xDSL Etc.

IMS Single Core

Access

3/2G

Transport

Control

Database

Billing

Service

WiMAX xDSL Etc.

SIPAS

IM SSF

OSA CSC

Service Enabler

• The S-CSCF (IMS Core) does not handle service interaction issues;

• The service platforms could consists of IM SSF, OSA SCS or SIP Application Server;

• The ISC interface is between the Serving CSCF and service platform(s);

• Easy 3rd Party Integration;

• The S-CSCF (IMS Core) shall decide whether an Application Server is required to receive information based on (filter) information received from the HSS.

S-CSCF

Camel AS

3rd Party AS

IMS Service

• Presence;

• Group and List Management;

• Push-to-Talk over Cellular;

• Voice over IP, Instant Messaging and Multimedia (Voice, Text, Video);

• Conferencing;

• Voice Call Continuity;

• IPTV over IMS;

Applications of IMS

http://www.youtube.com/watch?v=qR9-LgXEWok ; http://www.youtube.com/watch?v=ajlbA4hwPEs

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