name: IAB
full_form: Integrated Access and Backhaul
context: RAN2 and RAN3 have analysed SA5 requirements for "Performance measurements for gNB" defined in TS 28.552 [4], and came to the following conclusion: Table 6.2.2.1-1: Analysis on performance measurements for gNB in TS 28.552 Note 1: It is noted that the current table is based on TS 28.552 v16.0.0, and there may be more measurements due to SA5 progresses. Note 2: The table starts with the reference to clause 5.1.1 "Performance measurements valid for all gNB deployments". Given the generic approach that RAN2 has no insight into F1 (and its termination points), measurements feasibility by RAN2 has not been made for all possible deployments (e.g. but with the assumption that measurements are maintained per gNB, or gNB-CU or per gNB-DU). Note 3: Currently, for some measurements defined in TS 28.552, they are defined per mapped 5QI level (a single 5QI mapped to a DRB). From RAN2 point of view, mapping between 5QI and DRB in NR might be many to one, so there may be alternative ways to do the
description: The Integrated Access and Backhaul (IAB) UP TNL Address Update procedure is a sequence of operations between the gNB-CU-CP and gNB-CU-UP to update the TNL Addresses for DL F1-U GTP tunnels. The procedure involves the exchange of IAB UP TNL ADDRESS UPDATE and IAB UP TNL ADDRESS UPDATE ACKNOWLEDGE messages, which trigger the replacement of old TNL Addresses with new ones.
explanation: The context describes a specific sequence of operations between network components to update TNL Addresses, indicating that IAB is part of a procedure. The use of verbs like 'initiates', 'sends', 'replies', and 'shall replace' further emphasizes the procedural nature of IAB in this context.
section_title: 8.5.1.2	Successful Operation
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