name: BAP
full_form: Backhaul Adaptation Protocol
context: and QoS enforcement. To support a large quantity of BH RLC channels on each BH link, e.g., for fine-granular QoS support, an extended logical channel ID (eLCID) has been introduced. The IAB-MT further establishes SRBs (carrying RRC and NAS) with the IAB-donor-CU. For IAB-nodes operating in ENDC, the IAB-MT also establishes one or more DRBs with the IAB-donor-CU, which can be used, e.g., to carry OAM traffic. These SRBs and DRBs are transported between the IAB-MT and its parent node over Uu access channel(s). On the BAP sublayer, packets are routed based on the BAP routing ID, which is carried in the BAP header. The BAP routing ID consists of BAP address and BAP path ID, where the BAP address indicates the destination node of the packet on the BAP sublayer, and the BAP path ID indicates the routing path the packet should follow to this destination. The BAP sublayer further supports flow control in downstream direction, where the IAB-node sends feedback information on available buffer
description: The Backhaul Adaptation Protocol (BAP) is used in Integrated Access and Backhaul (IAB) for Next Generation Radio (NR). It operates on the BAP sublayer, enabling packet routing based on the BAP routing ID, which includes the BAP address and BAP path ID. The BAP sublayer also supports flow control in the downstream direction.
explanation: BAP is classified as a Protocol because it defines rules and procedures for adapting backhaul traffic within the IAB-NR network, specifically handling packet routing and flow control.
section_title: 19.1.4	Integrated access and backhaul for NR
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