This document provides a technical specification for the Evolved Universal Terrestrial Radio Access (E-UTRA) Radio Resource Control (RRC) protocol. It specifies the protocol architecture, services, functions, and procedures, including system information acquisition, connection control, radio bearer control, mobility procedures, and security functions. The RRC protocol is defined as part of the Layer 3 radio interface protocol architecture for E-UTRA and Evolved Universal Terrestrial Radio Access Network (E-UTRAN).