BH RLC channel:
Conditional PSCell Addition:
Conditional PSCell Change:
F1AP consists of Elementary Procedures (EPs). An Elementary Procedure is a unit of interaction between gNB-CU and gNB-DU. These Elementary Procedures are defined separately and are intended to be used to build up complete sequences in a flexible manner. If the independence between some EPs is restricted, it is described under the relevant EP description. Unless otherwise stated by the restrictions, the EPs may be invoked independently of each other as standalone procedures, which can be active in parallel. The usage of several F1AP EPs together is specified in stage 2 specifications (e.g., TS 38.470
An EP consists of an initiating message and possibly a response message. Two kinds of EPs are used:
Class 1: Elementary Procedures with response (success and/or failure).
Class 2: Elementary Procedures without response.
For Class 1 EPs, the types of responses can be as follows:
A signalling message explicitly indicates that the elementary procedure successfully completed with the receipt of the response.
A signalling message explicitly indicates that the EP failed.
On time supervision expiry (i.e., absence of expected response).
Successful and Unsuccessful:
One signalling message reports both successful and unsuccessful outcome for the different included requests. The response message used is the one defined for successful outcome.
Class 2 EPs are considered always successful.
Used in this specification when the F1AP is applied for gNB-CU and gNB-DU in E-UTRAN.
gNB-CU UE F1AP ID:
gNB-DU UE F1AP ID:
MBS session resource:
When F1AP messages associated to one MBS session uses the MBS-associated logical F1-connection for association of the message to the MBS session in gNB-DU and gNB-CU.
MBS-associated logical F1-connection:
MBS Session context in a gNB-DU:
Multicast F1-U Context:
Public network integrated NPN:
Stand-alone Non-Public Network:
The MBS-associated logical F1-connection uses the identities GNB-CU MBS F1AP ID and GNB-DU MBS F1AP ID according to the definition in TS 38.401
. For a received MBS-associated F1AP message the gNB-CU identifies the associated MBS session based on the GNB-CU MBS F1AP ID IE and the gNB-DU identifies the associated MBS session based on the GNB-DU MBS F1AP ID IE.
When F1AP messages associated to one UE uses the UE-associated logical F1-connection for association of the message to the UE in gNB-DU and gNB-CU.
UE-associated logical F1-connection:
U2N Relay UE:
The UE-associated logical F1-connection uses the identities GNB-CU UE F1AP ID and GNB-DU UE F1AP ID according to the definition in TS 38.401
. For a received UE associated F1AP message the gNB-CU identifies the associated UE based on the GNB-CU UE F1AP ID IE
and the gNB-DU identifies the associated UE based on the GNB-DU UE F1AP ID IE
. The UE-associated logical F1-connection may exist before the F1 UE context is setup in gNB-DU.
a UE that provides functionality to support connectivity to the network for U2N Remote UE(s).
U2N Remote UE:
a UE that communicates with the network via a U2N Relay UE.
Uu Relay RLC channel:
PC5 Relay RLC channel:
Sidelink relay adaptation protocol, as defined in TS 38.300
For the purposes of the present document, the abbreviations given in TR 21.905
and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905
5G Core Network
5G QoS Identifier
Access and Mobility Management Function
Antenna Reference Point
Additional RRM Policy Index
Closed Access Group
Configured Grant-Small Data Transmission
Cell Global Identifier
Conditional PSCell Change
Dual Active Protocol Stack
Downlink Positioning Reference Signal
E-UTRA-NR Dual Connectivity
Evolved Packet Core
MBS Frequency Selection Area (FSA) ID
Integrated Access and Backhaul
International Mobile station Equipment Identity and Software Version number
Location Management Function
Network Slice AS Group
Network Slice Selection Assistance Information
Propagation Delay Compensation
Paging Early Indication with Paging Subgrouping
Public Network Integrated NPN
Point to Point
Point to Multipoint
QoE Measurement Collection
Quality of Experience
RAN Area Code
Remote Interference Management
RIM Reference Signal
Radio Resource Control
Reference Signal Received Power
Small Data Transmission
Stand-alone Non-Public Network
Single Network Slice Selection Assistance Information
Tracking Area Code
Tracking Area Identity
Timing Error Group
Uplink Angle of Arrival
Uplink Relative Time of Arrival
Uplink Sounding Reference Signal
Zenith Angles of Arrival