name: BAP
full_form: Backhaul Adaptation Protocol
context: Fig. 4.7.2-1 shows the protocol stack for F1-U and Fig. 4.7.2-2 shows the protocol stack for F1-C between IAB-DU and IAB-donor-CU. In these figures, F1-U and F1-C are carried over two backhaul hops. F1-U and F1-C use an IP transport layer between IAB-DU and IAB-donor-CU as defined in TS 38.470[ NG-RAN; F1 general aspects and principles ]  [32]. F1-U and F1-C need to be security-protected as described in TS 33.501[ Security architecture and procedures for 5G System ]  [5] (the security layer is not shown in the Figures 4.7.2-1/2). On the wireless backhaul, the IP layer is carried over the Backhaul Adaptation Protocol (BAP) sublayer, which enables routing over multiple hops. The IP layer can also be used for non-F1 traffic, such as OAM traffic as defined in TS 38.401[ NG-RAN; Architecture description ]  [4]. On each backhaul link, the BAP PDUs are carried by BH RLC channels. Multiple BH RLC channels can be configured on each BH link to allow traffic prioritization and QoS enforcement. The BH-RLC-channel mapping for BAP PDUs is performed by the BAP entities on each IAB-node and the IAB-donor-DU. Protocol stacks for an IAB-donor with split gNB architecture are specified in TS 38.401[ NG-RAN; Architecture description ]  [4]. Fig. 4.7.2-1: Protocol stack for the support of F1-U protocol Fig. 4.7.2-2: Protocol stack for the support of F1-C protocol The IAB-MT further establishes SRBs (carrying RRC and NAS) with the IAB-donor-CU. For IAB-nodes operating in EN-DC, the IAB-MT establishes one or more DRBs with the eNB and one or more DRBs with the IAB-donor-CU, which can be used, e.g., to carry OAM traffic. For SA mode, the establishment of DRBs is optional. These SRBs and DRBs are transported between the IAB-MT and its parent node over Uu access channel(s). The protocol stacks for the SRB is shown in Fig. 4.7.2-3. Figure 4.7.2-3: Protocol stack for the support of IAB-MT's RRC and NAS connections
description: The Backhaul Adaptation Protocol (BAP) is a protocol used in the context of Integrated Access and Backhaul (IAB) to enable routing over multiple hops on the wireless backhaul. It allows for the carriage of IP traffic, including F1-U and F1-C protocols, between IAB-DU and IAB-donor-CU nodes. BAP operates as a sublayer beneath the IP transport layer, facilitating security protection and QoS enforcement through the use of BH RLC channels.
explanation: BAP is classified as a Protocol because it defines the rules for data transmission over the wireless backhaul in IAB networks, specifically enabling multi-hop routing and traffic prioritization. Its role in adapting IP traffic for transmission over the backhaul links aligns with the definition of a protocol in the context of 3GPP specifications.
section_title: 4.7.2 Protocol Stacks
biotag_Context: O,O,O,O,O,O,O,B-Interface,O,O,O,O,O,O,O,O,B-Interface,O,B-Network Function,O,O,O,O,O,B-Interface,O,B-Interface,O,O,O,O,O,O,B-Interface,O,B-Interface,O,O,B-Protocol,O,O,O,B-Network Function,O,B-Network Function,O,O,O,B-Specification,O,O,B-Interface,O,O,O,O,O,O,B-Interface,O,B-Interface,O,O,O,O,O,O,O,B-Specification,O,O,O,O,O,O,B-Technology,I-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,B-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,O,O,O,O,B-Specification,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,B-Network,B-Protocol,O,O,B-Network,B-Protocol,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,B-Measurement,O,O,O,O,O,B-Protocol,O,O,O,O,O,B-Protocol,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,B-Specification,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Interface,O,O,O,O,O,O,O,O,O,B-Interface,O,O,B-Network Function,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,O,O,B-Mode,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,B-Interface,O,O,O,O,O,O,O,B-Connection,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,B-Protocol,O
biotag_Description: O,B-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,B-Technology,I-Technology,I-Technology,I-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,B-Interface,O,B-Interface,O,O,B-Network Function,O,B-Network Function,O,B-Protocol,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,B-Measurement,O,O,O,O,O,B-Network,B-Protocol,O