To do this, we need a special control mechanism to exchange informations on those configurations between communicating parties. The resulting implementation of this control mechanism is called RRC (Radio Resource Control).

The Radio Resource Control (RRC) protocol is used in UMTS, LTE and 5G on the Air interface. It is a layer 3 (Network Layer) protocol used between UE and Base Station. This protocol is specified by 3GPP in TS 25.331 [2] for UMTS, in TS 36.331 [3] for LTE and in TS 38.331 [4] for 5G New Radio. RRC messages are transported via the PDCP-Protocol.

This page describes 5G NR UE RRC states. It mentions functions of RRC layer in 5G NR. The 5G NR UE states are RRC_IDLE, RRC_INACTIVE and RRC_CONNECTED mode. 5G NR RRC layer functions. The figure-1 depicts 5G NR protocol stack. The stack is divided into user plane and control plane. RRC layer is part of 5G NR control plane as shown.

Mar 5, 2021 · Radio Resource Control (RRC) is a layer within the 5G NR protocol stack. It exists only in the control plane, in the UE and in the gNB. The behaviour and functions of RRC are governed by the current state of RRC. In 5G NR, RRC has three distinct states: RRC_IDLE, RRC_CONNECTED and RRC_INACTIVE.

Jun 11, 2024 · The RRC protocol in 5G NR offers a sophisticated mechanism to manage UE states, balancing battery efficiency, connectivity, and mobility. Understanding the intricacies of RRC_IDLE, RRC_CONNECTED, and RRC_INACTIVE states is crucial for optimizing network performance and enhancing the user experience in 5G environments.

RRC Reconfiguration can include conditionalReconfiguration, where the UE is pre-configured with one or more “candidate” target cells. The UE automatically executes the reconfiguration when certain triggering conditions (e.g., measurement events) are met.

Feb 15, 2024 · Radio Resource Control (RRC): Negotiates radio resources and manages cell handovers. Non-Access Stratum (NAS): Provides overall system access and mobility control. Access and Mobility Management Function (AMF): The central control unit …

Jun 9, 2024 · The RRC state machine in 5G NR is integral to managing UE connectivity, balancing performance, signaling efficiency, and battery consumption. Understanding these states and their transitions enables effective management of 5G networks, ensuring robust and seamless connectivity for users.

Dec 19, 2023 · The RRC layer in 5G networks is a critical component for managing radio resources, enabling mobility, and ensuring secure and efficient communication between the User Equipment and the 5G NR network.

NR 5G RRC Overview The Radio Resource Control (RRC) state machine for New Radio (NR) is shown in Fig. 4.2.1.1 A UE starts from RRC Idle mode when it first camps on a 5G cell. for example.