name: 5G-AN
full_form: 5th Generation Access Network
context: When a UE connects to the 5GC via a 5G-AN node without providing any UE identities (i.e. a GUAMI or a 5G-S-TMSI), or the UE provides a GUAMI or a 5G-S-TMSI but the 5G-AN node cannot associate to any of its connected AMFs, the following steps are performed: 1. The 5G-AN node selects an AMF as defined in clause 6.3.5 of TS 23.501[ System architecture for the 5G System (5GS) ]  [2]. 2. The 5G-AN node creates an NGAP UE-TNLA-binding for the UE by selecting a TNL association from the available TNL associations permitted for the initial message e.g. N2 INITIAL UE MESSAGE for the selected AMF, as defined in clause 5.21.1.3 of TS 23.501[ System architecture for the 5G System (5GS) ]  [2] and forwards the UE message to the AMF via the selected TNL association. 3. The AMF may decide to use the TNL association selected by the 5G-AN or the AMF may modify the NGAP UE-TNLA-binding by triangular redirection. NOTE 1: This process could take place during the Registration procedure (for Initial Registration, Mobility Registration Update). 4. The AMF may decide to modify the NGAP UE-TNLA-binding toward other 5G-AN nodes such as N3IWF. This is done if the AMF is changed and old AMF have existing NGAP UE-TNLA-bindings toward other 5G-AN nodes. When a UE connects to the 5GC via a 5G-AN node with a 5G-S-TMSI or GUAMI associated with the AMF usable by the 5G-AN node, the following steps are performed: 1. The 5G-AN node creates an NGAP UE-TNLA-binding for the UE by selecting a TNL association from the available TNL associations permitted for the initial N2 message for the AMF identified by the UE's 5G-S-TMSI or GUAMI. 2. The AMF may decide to use the TNL association selected by the 5G-AN or the AMF may modify the NGAP UE-TNLA-binding by triangular redirection. NOTE 2: This process could take place during the Registration procedure or Service Request procedure.
description: The 5th Generation Access Network (5G-AN) is a network function that serves as an entry point for User Equipment (UE) to connect to the 5G Core (5GC). It plays a crucial role in managing UE connections, selecting suitable Access and Mobility Management Functions (AMFs), and creating NGAP UE-TNLA-bindings for efficient communication between the UE and the AMF. The 5G-AN node is responsible for forwarding UE messages to the selected AMF via the chosen TNL association, which may be modified by the AMF through triangular redirection if necessary.
explanation: The 5G-AN is classified as a Network Function because it acts as an intermediary between the UE and the 5GC, facilitating access and mobility management. Its primary functions include selecting AMFs, creating NGAP UE-TNLA-bindings, and forwarding UE messages, aligning with the network architecture and procedures defined in 3GPP TS 23.501 and TS 23.502.
section_title: 4.2.7.2.1 Creating NGAP UE-TNLA-bindings during Registration and Service Request
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