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Content for  TS 37.340  Word version:  18.2.0

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10.15 F1-C Traffic Transfer 
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10.15  F1-C Traffic Transfer |R16|  p. 102

In EN-DC/NR-DC, the F1-C Traffic Transfer message is sent by the MN to the SN or by the SN to MN to transfer the F1-C traffic to and from an IAB-node.
Reproduction of 3GPP TS 37.340, Fig. 10.15-1: F1-C transfer procedure in EN-DC
Figure 10.15-1: F1-C transfer procedure in EN-DC
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Step 1.
When the IAB-MT sends a F1-AP message encapsulated in SCTP/IP or F1-C related (SCTP/)IP packet, it sends it to the MN in a container within ULInformationTransfer message as specified in TS 36.331.
Step 2.
The MN initiates the F1-C Traffic Transfer procedure, in which it transfers the received F1-AP message encapsulated in (SCTP/)IP or F1-C related (SCTP/)IP packet as an octet string.
Step 3.
When the SN sends a F1-AP message encapsulated in SCTP/IP or F1-C related (SCTP/)IP packet, it sends it to the MN as an octet string through the F1-C Traffic Transfer procedure.
Step 4.
The MN sends the received F1-AP message encapsulated in SCTP/IP or F1-C related (SCTP/)IP packet to the IAB-MT in a container within DLInformationTransfer message as specified in TS 36.331.
Reproduction of 3GPP TS 37.340, Fig. 10.15-2: Scenario 1: F1-C transfer between IAB-MT and SN (F1-terminating node) in NR-DC
Figure 10.15-2: Scenario 1: F1-C transfer between IAB-MT and SN (F1-terminating node) in NR-DC
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Step 1.
The IAB-MT sends a F1-AP message encapsulated in SCTP/IP or F1-C related (SCTP/)IP packet to the MN (non-F1-terminating node) via SRB2 in a container within ULInformationTransfer message as specified in TS 38.331.
Step 2.
The MN initiates the F1-C Traffic Transfer procedure, in which it transfers the received F1-AP message encapsulated in (SCTP/)IP or F1-C related (SCTP/)IP packet as an octet string.
Step 3.
The SN (F1-terminating node) sends a F1-AP message encapsulated in SCTP/IP or F1-C related (SCTP/)IP packet to the MN as an octet string through the F1-C Traffic Transfer procedure.
Step 4.
The MN sends the received F1-AP message encapsulated in SCTP/IP or F1-C related (SCTP/)IP packet to the IAB-MT via SRB2 in a container within DLInformationTransfer message as specified in TS 38.331.
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