Channel state information transmission in a wireless network

1. A method comprising:

receiving, by a wireless device, one or more radio resource control (RRC) messages comprising configuration parameters for a licensed assisted access (LAA) cell, the configuration parameters comprising one or more channel state information (CSI) parameters;

receiving a downlink control information (DCI) indicating uplink resources in a number of one or more consecutive uplink subframes of the LAA cell, the DCI comprising a first field, a second field, and one or more third fields;

determining a position of a first subframe in the one or more consecutive uplink subframes employing the first field; and

transmitting, in the first subframe, one or more CSI fields of the LAA cell when:

the second field is set to trigger a CSI report; and

the wireless device is allowed to transmit in the first subframe according to a listen-before-talk (LBT) procedure based, at least, on the one or more third fields.

2. The method of claim 1 , wherein the one or more CSI fields are associated with one or more CSI processes identified based, at least in part, on the second field.

3. The method of claim 1 , wherein the one or more CSI fields are associated with one or more CSI processes identified based, at least in part, on the one or more RRC messages.

4. The method of claim 1 , wherein the configuration parameters comprise one or more CSI reference signal (CSI-RS) radio resource parameters and one or more CSI interference measurement (CSI-IM) resource parameters.

5. The method of claim 1 , wherein the DCI indicates the number of the one or more consecutive uplink subframes.

6. The method of claim 1 , wherein at least one of the one or more third fields indicates one or more LBT procedure configuration parameters.

7. The method of claim 1 , wherein the CSI fields comprise a channel quality index (CQI), a precoding matrix indicator (PMI) and a rank indicator (RI).

8. The method of claim 1 , further comprising performing measurements in one or more second subframes according to a subframe pattern configuration, wherein the configuration parameters indicate the subframe pattern configuration.

9. The method of claim 1 , wherein the DCI further comprises a fourth field indicating a resource block assignment for transmitting the one or more CSI fields.

10. The method of claim 1 , wherein the DCI further comprises a transmit power control (TPC) employed for calculating a transmit power for transmission of the one or more CSI fields.

11. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive one or more radio resource control (RRC) messages comprising configuration parameters for a licensed assisted access (LAA) cell, the configuration parameters comprising one or more channel state information (CSI) parameters;

receive a downlink control information (DCI) indicating uplink resources in a number of one or more consecutive uplink subframes of the LAA cell, the DCI comprising a first field, a second field, and one or more third fields;

determine a position of a first subframe in the one or more consecutive uplink subframes employing the first field; and

transmit, in the first subframe, one or more CSI fields of the LAA cell when:

the second field is set to trigger a CSI report; and

the wireless device is allowed to transmit in the first subframe according to a listen-before-talk (LBT) procedure based, at least, on the one or more third fields.

12. The wireless device of claim 11 , wherein the one or more CSI fields are associated with one or more CSI processes identified based, at least in part, on the second field.

13. The wireless device of claim 11 , wherein the one or more CSI fields are associated with one or more CSI processes identified based, at least in part, on the one or more RRC messages.

14. The wireless device of claim 11 , wherein the configuration parameters comprise one or more CSI reference signal (CSI-RS) radio resource parameters and one or more CSI interference measurement (CSI-IM) resource parameters.

15. The wireless device of claim 11 , wherein the DCI indicates the number of the one or more consecutive uplink subframes.

16. The wireless device of claim 11 , wherein at least one of the one or more third fields indicates one or more LBT procedure configuration parameters.

17. The wireless device of claim 11 , wherein the CSI fields comprise a channel quality index (CQI), a precoding matrix indicator (PMI) and a rank indicator (RI).

18. The wireless device of claim 11 , the instructions, when executed by the one or more processors, further cause the wireless device to perform measurements in one or more second subframes according to a subframe pattern configuration, wherein the configuration parameters indicate the subframe pattern configuration.