Systems and methods for license assisted access

An evolved node B (eNB), comprising:

• a higher layer processor configured to transmit a radio resource control (RRC) message to specify subframes for a channel state information-reference signal (CSI-RS), wherein the higher layer processor is further configured to transmit a RRC message to specify a first serving cell as a scheduling cell for a second serving cell, the second serving cell is a serving cell on which a shared channel is transmitted;
• a control channel transmitter configured to transmit a first control channel and a second control channel in a subframe, the first control channel indicating whether the CSI-RS in the subframe is available for CSI measurement, the second control channel being a control channel of which detection indicates a transmission of the shared channel in the subframe, wherein the control channel transmitter is further configured, based upon a configuration of the first serving cell, to transmit the first control channel on the second serving cell and to transmit the second control channel on the first serving cell;
• and
• a shared channel transmitter configured to transmit the shared channel when the second control channel is transmitted.

A method in a user equipment (UE), comprising:

• receiving a radio resource control (RRC) message to specify subframes for a channel state information-reference signal (CSI-RS);
• receiving a RRC message to configure a first serving cell as a scheduling cell for a second serving cell, the second serving cell is a serving cell on which a shared channel is received;
• monitoring a first control channel and a second control channel in a subframe, the first control channel indicating whether the CSI-RS in the subframe is available for CSI measurement, the second control channel being a control channel of which detection indicates a transmission of the shared channel in the subframe;
• monitoring, based upon a configuration of the first serving cell, the first control channel on the second serving cell and to monitor the second control channel on the first serving cell;
• and
• receiving the shared channel when the second control channel is detected.

A method in an evolved node B (eNB), comprising:

• transmitting a radio resource control (RRC) message to specify subframes for a channel state information-reference signal (CSI-RS);
• transmitting a RRC message to specify a first serving cell as a scheduling cell for a second serving cell, the second serving cell is a serving cell on which a shared channel is transmitted
• transmitting a first control channel and a second control channel in a subframe, the first control channel indicating whether the CSI-RS in the subframe is available for CSI measurement, the second control channel being a control channel of which detection indicates a transmission of the shared channel in the subframe;
• transmitting, based upon a configuration of the first serving cell, the first control channel on the second serving cell and to transmit the second control channel on the first serving cell;
• and
• transmitting the shared channel when the second control channel is transmitted.