The control plane consists of protocols for control and support of the user plane functions:
controlling the E-UTRA network access connections, such as attaching to and detaching from E-UTRAN;
controlling the attributes of an established network access connection, such as activation of an IP address;
controlling the routing path of an established network connection in order to support user mobility; and
controlling the assignment of network resources to meet changing user demands.
The following control planes are used in E-UTRAN mode.