2019/06 48 p.
The present document describes the overall architecture of the NG-RAN, including interfaces NG, Xn and F1 interfaces
and their interaction with the radio interface.
The general principles guiding the definition of NG‑RAN architecture as well as the NG‑RAN interfaces are the
Logical separation of signalling and data transport networks.
NG-RAN and 5GC functions are fully separated from transport functions. Addressing scheme used in NG‑RAN
and 5GC shall not be tied to the addressing schemes of transport functions. The fact that some NG‑RAN or 5GC
functions reside in the same equipment as some transport functions does not make the transport functions part of
the NG-RAN or the 5GC.
Mobility for an RRC connection is fully controlled by the NG‑RAN.
The NG-RAN interfaces are defined along the following principles:
The functional division across the interfaces have as few options as possible.
Interfaces are based on a logical model of the entity controlled through this interface.
One physical network element can implement multiple logical nodes.
full Table of Contents for TS 38.401 Word version: 15.6.0