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TS 38.401RAN3
Architecture Description

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V16.1.0 (Wzip)2020/03  50 p.
V15.7.0 (PDF)  2019/12  49 p.

WI Acronym:  NR_newRAT
Rapporteur:  Mr. Ng, ChenghockNEC Telecom MODUS Ltd.

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.
3GPP 38.401 - NG-RAN Overall Architecture
The general principles guiding the definition of NG‑RAN architecture as well as the NG‑RAN interfaces are the following:
  • 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:   16.0.0

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1  ScopeWord-p. 6
2  References
3  Definitions and abbreviationsWord-p. 7
4  General principlesWord-p. 8
5  General architecture
6  NG-RAN architectureWord-p. 10
7  NG-RAN functions descriptionWord-p. 15
8  Overall procedures in gNB-CU/gNB-DU Architecture
8.1  UE Initial Access
8.2  Intra-gNB-CU MobilityWord-p. 17
8.3  Mechanism of centralized retransmission of lost PDUs
8.4  Multi-Connectivity operationWord-p. 22
8.5  F1 Startup and cells activationWord-p. 25
8.6  RRC state transitionWord-p. 26
8.7  RRC connection reestablishmentWord-p. 28
8.8  Multiple TNLAs for F1-CWord-p. 30
8.9  Overall procedures involving E1 and F1Word-p. 31
8.10  Multiple TNLAs for E1Up
8.11  Support of Network Sharing with multiple cell-ID broadcastWord-p. 42
9  Synchronization
10  NG-RAN interfacesWord-p. 45
11  Overall procedures in NG-RAN Architecure
A  Deployment scenarios of gNB/en-gNBWord-p. 47
B  NG-RAN Architecture for Radio Access Network Sharing with multiple cell ID broadcast (informative)Word-p. 48
C  Change HistoryWord-p. 49

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