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LTE Standards by Jean-Gabriel Remy, Charlotte Letamendia

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3

The Full IP Core Network

3.1. Fixed mobile convergence

Fixed mobile convergence (FMC) is set of a technology bringing seamless connectivity between fixed and wireless communication networks.

FMC is the answer to the desire of consumers to be connected anytime anywhere and from any device.

This requires:

fixed and wireless broadband;
IP Multimedia Subsystem (IMS);
Session Initiation Protocol (SIP):
- Voice over Internet Protocol (VoIP),
- common service delivery platform.

FMC, to be seamless to the end user, involves personalization for the user services.

FMC includes:

Unlicenced Mobile Access (UMA), with UMA-capable devices;
SIP-based services;
seamless roaming between mobile accesses (cellular, WiFi, etc.).

3.2. IP multimedia subsystem

3.2.1. General description of IMS

3GPP has taken IMS (Internet Multimedia Subsystem) as the core of its telecommunication standards. This trend has been followed by ETSI and other standardization bodies such as ANSI.

Figure 3.1. IMS

image

IMS was introduced by 3GPP with release 5 and developed to date. It is also developed by ETSI TISPAN (for fixed telecommunication). IMS is based on IETF protocols. OMA specify the service layer application.

Although originally specified by 3GPP, a number of other organizations around the world support IMS. In addition to the IETF, which specifies key protocols such as SIP, and the OMA, which specifies ...

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