name: SCG
full_form: Secondary Cell Group
context: RRC signalling with the SN via the MCG as in Rel-15 (e.g. to report SCG radio link/beam failure, mobility measurement results); - in case of PSCell change, the UE does not perform random access towards the new PSCell if the SCG is to remain deactivated. Data transmission while the SCG is deactivated When the SCG is deactivated: - data can be transmitted or received via MCG bearers or via the MCG leg of split bearers; - SCG bearers can remain configured; - if there are uplink data to transmit on an SCG bearer, the UE indicates it to the network via RRC signalling. SCG activation/deactivation The network activates or deactivates the SCG by sending an RRC reconfiguration message to the UE. For SCG activation, if the PSCell hasn't changed since the SCG deactivation, the timing advance is still valid and beam/radio link failure was not detected, it is possible to perform SCG activation without random access, i.e. the UE starts monitoring PDCCH and can receive downlink assignments and
description: The Secondary Cell Group (SCG) is a network function that manages secondary cells in a multi-RAT dual-connectivity scenario, enabling data transmission and reception via multiple cell groups. It handles SCG radio link/beam failure reporting, mobility measurement results, and SCG activation/deactivation.
explanation: SCG is classified as a Network Function based on its role in managing secondary cells within the network, as highlighted by the context from 3GPP TS 21.917, section 13.2.2.
section_title: 13.2.2	Further Multi-RAT Dual-Connectivity enhancements
biotag_Context: B-Protocol,O,O,O,B-Message,O,O,B-Network,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O,B-Network,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Device,O,O,O,O,O,O,B-Protocol,O,B-Network Function,O,O,O,O,O,O,O,B-Network Function,O,O,O,B-Protocol,O,O,O,O,O,O,B-Network Function,O,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,O,O,O,O,B-Network Function,O,O,O,O,O,O,B-Device,O,O,B-Connection,O,O,O,O,O,O
biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,B-Network Function,O