Fast Secondary Cell Activation with Temporary Reference Signals

A user equipment (UE), comprising:

• a transceiver configured to communicate with a first cell and a secondary cell;
• and
• a processor communicatively coupled to the transceiver and configured to perform operations comprising:
• receiving secondary cell (SCell) activation configuration information from the first cell;
• receiving a medium access control (MAC) control element (CE) from the first cell, wherein the MAC CE indicates that a SCell state is to be changed from a deactivated state to an activated state;
• and
• receiving aperiodic reference signals from the secondary cell (SCell), wherein the reception of the aperiodic reference signals is triggered by the MAC CE.