Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification

Grounded in the official 3GPP Scope excerpt

TS 36.331 specifies the RRC protocol for the UE–E-UTRAN radio interface and the RN–E-UTRAN radio interface. It also covers radio-related information carried in transparent containers between source and target eNBs at inter-eNB handover, and between a source or target eNB and another system at inter-RAT handover. Additionally, it governs RRC configuration of the IAB-node to parent-node radio interface per TS 38.300. A RAN or core engineer would open this spec when implementing or debugging RRC signaling on the LTE Uu interface, handling handover container contents for intra-LTE or inter-RAT mobility, or deploying IAB nodes that use E-UTRA RRC for backhaul link configuration. It is also the reference for RN radio interface configuration and any UE/eNB behavior driven by RRC procedures on E-UTRAN.

Generated 7/26/2026 · cached for 90 days