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S1AP View of LTE Attach and EPS Bearer Setup

This sequence diagram looks at LTE Attach and EPS Bearer Setup from the S1AP vantage point. The following signaling is covered:

  1. UE Attach, authentication and security signaling
  2. Setup of two EPS Bearers (RAB id 5 and 6)
  3. Release of UE context due to inactivity
  4. Reestablishment of the UE context with a Service Request.

You can click on individual messages in the sequence diagram to see field level details.

Click to see the "S1AP View of LTE Attach & EPS Bearer Setup"  sequence diagram


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3GPP LTE Evolved Packet System & Application to Femtocells

The Evolved Packet System (EPS) comprises the Long-Term Evolution (LTE) specifications of the 3GPP mobile network standard, including evolved radio access network (E-UTRAN) and system architecture evolution (SAE). This talk provides an overview of the 3GPP mobile network evolution, including the following topics: from GSM over UMTS to LTE and LTE-Advanced: the roots of next generation mobile network standards; 3GPP standardization architecture: specification groups and their responsibilities; overview of the LTE/SAE system architecture; quality of service architecture; overview of E-UTRAN; outlook on LTE-Advanced and beyond; and, of course, femtocells in LTE.