name: U2N
full_form: User plane to Network plane
context: If upper layers abort the RRC connection establishment procedure, due to a NAS procedure being aborted as specified in TS 24.501[ Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3 ]  [23], while the UE has not yet entered RRC_CONNECTED, the UE shall: 1> stop timer T300, if running; 1> reset MAC, release the MAC configuration and re-establish RLC for all RBs that are established (except broadcast MRBs). The L2 U2N Relay UE either indicates to upper layers (to trigger PC5 unicast link release) or sends NotificationMessageSidelink message to the connected L2 U2N Remote UE(s) in accordance with 5.8.9.10. The L2 U2N Remote UE indicates to upper layers to trigger PC5 unicast link release with its connected L2 U2N Relay UE.
description: The User plane to Network plane (U2N) interface is a critical communication path within the 3GPP architecture, specifically relevant in the context of sidelink communications. It enables the exchange of information between the user equipment and the network, facilitating procedures such as RRC connection establishment and release. The U2N interface plays a key role in managing the interaction between the UE and the network for efficient data transmission and control signaling.
explanation: U2N is classified as an Interface because it represents a communication boundary between different layers or entities within the 3GPP architecture, specifically focusing on the exchange of information related to user plane and network plane operations. This classification aligns with the context provided from 3GPP TS 38.331, highlighting its role in sidelink communications and RRC connection management.
section_title: 5.3.3.8 Abortion of RRC connection establishment
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