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TS 36.401 (RAN3)
E-UTRAN – Architecture description

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(P) V14.0.0    2017/03    23 p.
(P) V13.2.0    2016/06    23 p.
(P) V12.3.0    2015/12    23 p.
(P) V11.2.0    2013/09    22 p.
(P) V10.4.0    2012/07    22 p.
(P) V9.2.1    2011/04    21 p.
(P) V8.8.0    2010/06    21 p.

Rapporteur:  Mr. Ng, Cheng Hock
See also:  E-UTRAN-related TS/TR     TS 25.401 (UTRAN overall description)

This TS describes the overall architecture of the E-UTRAN, including internal interfaces and assumptions on the radio, S1 and X2 interfaces.

The general principles guiding the definition of E-UTRAN Architecture as well as the E-UTRAN interfaces are the following:
  • Logical separation of signalling and data transport networks.
  • E-UTRAN and EPC functions are fully separated from transport functions. Addressing scheme used in E-UTRAN and EPC shall not be tied to the addressing schemes of transport functions. The fact that some E-UTRAN or EPC functions reside in the same equipment as some transport functions does not make the transport functions part of the E-UTRAN or the EPC.
  • Mobility for RRC connection is fully controlled by the E-UTRAN.
  • When defining the E-UTRAN interfaces the following principles were followed:
    • The functional division across the interfaces shall have as few options as possible.
    • Interfaces should be based on a logical model of the entity controlled through this interface.
    • One physical network element can implement multiple logical nodes.


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1   Scope [R8]   PDF-p. 6
2   References [R8]
3   Definitions and abbreviations [R8]   PDF-p. 7
4   General principles [R8]   PDF-p. 8
5   General architecture [R8]   PDF-p. 9
6   E-UTRAN architecture [R8]   PDF-p. 10      Up
7   E-UTRAN functions description [R8]   PDF-p. 14
8   Mobility management [R8]
9   Synchronization [R8]
10   Void
11   E-UTRAN interfaces [R8]
A   Change history   PDF-p. 21      Up

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