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TS 38.401
NG-RAN —
Architecture Description

V18.5.0 (PDF)2025/03  161 p.
V17.10.0  2024/09  127 p.
V16.12.0  2024/03  83 p.
V15.10.0  2023/09  49 p.
Rapporteur:
Mr. Ng, Chenghock
NEC Corporation

3GPP 38.401 - NG-RAN Overall Architecture

essential Table of Contents for  TS 38.401  Word version:  18.4.0

each title, in the "available" or "not available yet" area, links to the equivalent title in the CONTENT
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List of Figures and Tables

Figure 5.2-1NG and Uu user plane
Figure 5.3-1NG and Uu control plane
Figure 6.1-1Overall architecture
Figure 6.1.2-1Overall architecture for separation of gNB-CU-CP and gNB-CU-UP
Figure 6.1.3-1Overall architecture of IAB
Figure 6.1.4-1Protocol stack for F1-U of IAB
Figure 6.1.4-2Protocol stack for F1-C of IAB
Figure 6.1.4-3Protocol stack for IAB F1-C traffic exchanged via the MeNB
Figure 6.1.4-4Protocol stack for IAB F1-C traffic exchanged via the MgNB
Figure 6.1.4-5Protocol stack for IAB F1-C traffic exchanged via the SgNB
Figure 6.1.6-1User plane protocol stack for L2 UE-to-Network Relay
Figure 6.1.6-2Control plane protocol stack for L2 UE-to-Network Relay
Figure 8.1-1UE Initial Access procedure
Figure 8.2.1.1-1Inter-gNB-DU Mobility for intra-NR
Figure 8.2.1.3-1Inter-gNB-DU Conditional Handover or Conditional PSCell Change or subsequent CPAC for intra-NR
Figure 8.2.1.4-1Intra-gNB-DU LTM
Figure 8.2.1.5-1Inter-gNB-DU LTM
Figure 8.2.1.6-1LTM with the change of gNB-CU-UP
Figure 8.2.2.1-1Inter-gNB-DU Mobility using MCG SRB in EN-DC
Figure 8.2.2.3-1Inter-gNB-DU Conditional PSCell Change using MCG SRB without MN negotiation in EN-DC
Figure 8.2.3.1-1IAB intra-CU topology adaptation procedure
Figure 8.2.3.2-1IAB intra-CU topology adaptation procedure using MCG SRB in EN-DC
Figure 8.2.4-1Example for IAB topology with two redundant paths
Figure 8.2.4-2Procedure for establishment of redundant path in IAB topology
Figure 8.2.5-1IAB intra-CU backhaul RLF recovery procedure for an IAB-node in SA mode
Figure 8.3.1-1Procedure for centralized retransmission in intra gNB-CU scenarios
Figure 8.4.1.1-1SgNB addition procedure in EN-DC
Figure 8.4.2.1-1SgNB release procedure in EN-DC (MN initiated)
Figure 8.4.2.1-2SgNB release procedure in EN-DC (SN initiated)
Figure 8.4.3-1SCG Suspend/Resume in RRC_INACTIVE
Figure 8.4.4.1-1SCG Activation or Deactivation in SN Addition procedure
Figure 8.4.4.2-1SCG Activation or Deactivation in MN initiated SN Modification procedure
Figure 8.4.4.3-1SCG Activation or Deactivation in SN initiated SN Modification procedure
Figure 8.5-1F1 startup and cell activation
Figure 8.6.1-1RRC connected to RRC inactive state transition procedure
Figure 8.6.2-1RRC inactive to other RRC states transition procedure
Figure 8.7-1RRC connection reestablishment procedure
Figure 8.8-1Managing multiple TNLAs for F1-C
Figure 8.9.1-1UE Initial Access procedure involving E1 and F1
Figure 8.9.2-1Bearer context setup over F1-U
Figure 8.9.3.1-1Bearer context release over F1-U - gNB-CU-CP initiated
Figure 8.9.3.2-1Bearer context release over F1-U - gNB-CU-UP initiated
Figure 8.9.4-1Inter-gNB handover involving gNB-CU-UP change
Figure 8.9.5-1Change of gNB-CU-UP
Figure 8.9.6.1-1RRC Connected to RRC Inactive state transition
Figure 8.9.6.2-1RRC Inactive to RRC Connected state transition
Figure 8.9.7-1Trace activation/deactivation over F1 and E1
Figure 8.9.8-1Signalling flow for IAB BH RLC channel establishment procedure
Figure 8.10-1Managing multiple TNLAs for E1
Figure 8.11.2-1UE Initial Access procedure and network sharing with multiple cell-ID broadcast
Figure 8.11.3-1RRC Connection Reestablishment and network sharing with multiple cell-ID broadcast
Figure 8.12.1-1The integration procedure for IAB-node in SA
Figure 8.12.2-1Signalling flow for IAB integration procedure in NSA
Figure 8.12.3-1Decoupled mobile IAB-node integration procedure
Figure 8.13.1-1Signalling based MDT Activation
Figure 8.13.2.2-1Management based MDT Activation in gNB-CU-CP
Figure 8.13.2.3-1Management based MDT Activation in gNB-DU
Figure 8.13.2.4-1Management based MDT Activation in gNB-CU-UP
Figure 8.13.2.5-1User consent propagation in EN-DC
Figure 8.13.2.6-1User consent propagation in NR-DC and NGEN-DC
Figure 8.13.2.7-1Data anonymization in MR-DC when the SN is the SgNB
Figure 8.14.1.1-1Example of signalling of RLF information from gNB-CU to gNB-DU in NG RAN
Figure 8.14.1.2-1Example of signalling of RACH information from gNB-CU to gNB-DU in NG-RAN
Figure 8.15.1.1-1Broadcast MBS Session Setup
Figure 8.15.1.1a-1Broadcast MBS Session Setup for resource efficiency for MOCN
Figure 8.15.1.1b-1Broadcast MBS Session Setup for RAN sharing with multiple cell-ID broadcast
Figure 8.15.1.2-1Multicast MBS Session Context establishment
Figure 8.15.1.3-1Multicast MRB type re-configuration with F1-U ptp retransmission tunnel establishment
Figure 8.15.2.1-1Inter-gNB-CU Mobility for Multicast
Figure 8.16.1-1Conditional Secondary Node Addition procedure
Figure 8.17.2.1-1IAB inter-CU topology redundancy procedure
Figure 8.17.3.1-1IAB inter-CU topology adaptation procedure
Figure 8.17.3.2-1IAB inter-CU topology adaptation procedure with descendant IAB-node
Figure 8.17.4-1IAB inter-CU backhaul RLF recovery procedure for an IAB-node in SA mode
Figure 8.18.1-1RACH based Small Data Transmission in RRC Inactive state
Figure 8.18.2-1CG based Small Data Transmission in RRC Inactive state
Figure 8.18.3-1RA-SDT or non-SDT with CG-SDT configuration
Figure 8.18.4-1Mobile Terminated Small Data Transmission in RRC Inactive state
Figure 8.19.1-1Remote UE Initial Access procedure
Figure 8.19.2-1Remote UE RRC Reestablishment procedure
Figure 8.19.3-1Remote UE RRC Resume procedure
Figure 8.19.4.1-1U2N Remote UE Direct-to-indirect Path Switch with gNB-DU change procedure
Figure 8.19.4.2-1U2N Remote UE Direct-to-indirect Path Switch without gNB-DU change procedure
Figure 8.19.4.3-1U2N Remote UE Direct-to-indirect Path Switch with gNB-CU change procedure
Figure 8.21.1-1The integration procedure for Network Controlled Repeater
Figure 8.22.1-1Signalling procedure of inter-DU direct path addition on top of indirect path
Figure 8.22.2-1Signalling procedure of inter-DU indirect path addition on top of direct path
Figure 8.22.3-1Signalling procedure of intra-DU direct path addition on top of indirect path
Figure 8.22.4-1Signalling procedure of intra-DU indirect path addition on top of direct path
Figure 8.23.1-1Procedure for Xn-based migration of mobile IAB-MT
Figure 8.23.2-1Procedure for NG-based migration of mobile IAB-MT
Figure 8.23.3-1Mobile IAB-DU inter-CU migration procedure
Figure 8.23.4-1Procedure for RLF recovery of mobile IAB-node
Figure 8.24.1-1RAN TSS reporting towards the CN
Figure 8.24.2-1RAN TSS reporting towards the UE in RRC_CONNECTED state
Figure 11.1-1Managing multiple TNLAs for Xn-C
Figure A-1Example deployment of an Logical gNB/en-gNB

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