8.8 IAB Procedures

36.4233GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 Application Protocol (X2AP)

8.8.1 F1-C Traffic Transfer

8.8.1.1 General

The purpose of the F1-C Traffic Transfer procedure is to deliver F1-C traffic to the MeNB so that it is then forwarded to the IAB-node, or deliver F1-C traffic to the en-gNB, if it was received from the IAB-node.

The procedure uses UE-associated signalling.

8.8.1.2 Successful Operation

Figure 8.8.1.2-1: F1-C Traffic Transfer procedure, successful operation.

Either the MeNB initiates the procedure by sending the F1-C TRAFFIC TRANSFER message including the received F1-C traffic to the en-gNB, or the en-gNB initiates the procedure by sending the F1-C TRAFFIC TRANSFER message to the MeNB.

Upon reception of the F1-C TRAFFIC TRANSFER message, the MeNB shall deliver the contained F1-C traffic to the IAB-node as specified in TS 36.331 [9].

Upon reception of the F1-C TRAFFIC TRANSFER message, the en-gNB shall handle the received F1-C traffic as specified in TS 38.473 [44] and TS 38.472 [48].

8.8.1.3 Unsuccessful Operation

Not applicable.

8.8.1.4 Abnormal Conditions

Not Applicable.