Systems and methods for license assisted access
A user equipment (UE) is described. The UE includes a higher layer processor configured to receive a radio resource control (RRC) message to specify subframes for a channel state information-reference signal (CSI-RS). The UE also includes a control channel receiver configured to monitor a first control channel and a second control channel in a subframe. The first control channel indicates whether the CSI-RS in the subframe is available for CSI measurement. The second control channel is a control channel of which detection indicates a transmission of a shared channel in the subframe. The UE further includes a shared channel receiver configured to receive the shared channel when the second control channel is detected.
1. A user equipment (UE), comprising:
a higher layer processor configured to receive 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 receive 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;
a control channel receiver configured to monitor 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 receiver is further configured, based upon a configuration of the first serving cell, to monitor the first control channel on the second serving cell and to monitor the second control channel on the first serving cell; and
a shared channel receiver configured to receive the shared channel when the second control channel is detected.
2. The UE of claim 1 , wherein
the control channel receiver is configured, if a cross carrier scheduling is not configured for a serving cell on which the shared channel is received, to monitor the first control channel and the second control channel on the serving cell.
3. The UE of claim 1 , wherein
the first control channel further indicates the number of remaining consecutive subframes in a burst in which the subframe is included.
4. 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.
5. The eNB of claim 4 , wherein
the control channel transmitter is configured, if a cross carrier scheduling is not configured for a serving cell on which the shared channel is transmitted, to transmit the first control channel and the second control channel on the serving cell.
6. The eNB of claim 4 , wherein
the first control channel further indicates the number of remaining consecutive subframes in a burst in which the subframe is included.
7. 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.
8. 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.