nnects to the network using the existing Uu procedures. a. It selects a cell and establishes an RRC connection. The RRC connection uses NR access for IAB nodes operating in standalone mode or LTE when operating in EN-DC mode. b. The IAB node MT registers to the core network (5GC or EPC, depending on stan- dalone or EN-DC mode of CN connectivity, respectively) and is authenticated for IAB operation. C. The IAB node MT function may establish IP connectivity for OAM support. For IAB nodes operating in standalone mode, the MT establishes a PDU session to a data net- work via the 5GC. For IAB node operation in EN-DC, the MT establishes a PDN connection to an Access Point Name (APN) via the EPC. These procedures are the same as for a UE. d. When operating in standalone mode, the IAB node's MT is handed over to a suitable IAB donor CU unless it is already connected to such a suitable IAB donor. If operating in EN-DC, the eNB uses the dual connectivity procedure to add a suitable IAB donor CU as SgNB. In either case, establishment of the connection to the IAB donor CU occurs via a gNB-DU, which may reside on an IAB node or the IAB donor. 2. The IAB donor configures backhaul connectivity. a. The IAB donor gNB configures backhaul RLC channels to carry the IAB node DU's F1-C. Potentially, additional backhaul RLC channels are pre-emptively configured to also carry F1-U. This configuration is performed via the IAB node MT's RRC connec- tion. b. The IAB donor gNB configures the BAP routing identifiers for the IAB node and pop- ulates routing entries on IAB nodes residing on the route between the new IAB node and the IAB donor gNB. An IP address is allocated for the IAB node DU to support IP connectivity for F1. This IP address is either allocated by the IAB donor CU or the IAB donor DU. In both cases, it is configured via RRC. 5.2 Wireless Relaying in 5G Integrating Parent IAB-donor IAB-donor IAB-node IAB-node 1a. IAB-node establishes RRC connection with gNB 1b. IAB-node MT registers with 5GC via gNB and obtains authorization 