5
Life in EPS Networks
The objective of this chapter is to describe the different steps and mechanisms which are part of terminal and network life. To be more pragmatic, all these mechanisms are described from the viewpoint of the subscriber life, starting with the initial attachment at power-on to communication session setup and mobility in different conditions. In each, the interactions between the terminal and the network are described, as well as the related mechanisms which take place in the EPS network.
For that purpose, this chapter is split into four different parts:
- Network attachment – which focuses on the mechanisms in place to allow user initial registration.
- Communication sessions – which describes the different aspects of sessions, including session setup, Quality of Service negotiation, security procedures, etc.
- Mobility in IDLE mode – covering all procedures which take place when the terminal is inactive and moving through the network.
- Mobility in ACTIVE mode – which describes the most representative cases of user mobility during an active communication session.
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