Downlink control information in a wireless device and wireless network

1. A method comprising:

receiving, at a wireless device, at least one message comprising configuration parameters for a licensed assisted access (LAA) cell, the configuration parameters comprising one or more sounding reference signal (SRS) parameters;

receiving a downlink control information (DCI) comprising: a resource block assignment field for a subframe;

an SRS request field indicating whether an SRS is transmitted in the last symbol of the subframe; and

an ending symbol field for a physical uplink shared channel (PUSCH) indicating whether the PUSCH is not transmitted in the last symbol of the subframe for a first listen before talk procedure to be performed during the last symbol of the subframe;

transmitting, in the subframe and via the PUSCH, one or more transport blocks based on the ending symbol field; and

transmitting the SRS in the last symbol of the subframe when the SRS request field indicates that SRS transmission is triggered; and

wherein no cell-specific SRS subframe is configured for the LAA cell.

2. The method of claim 1 , wherein the ending symbol field is one bit.

3. The method of claim 1 , wherein the SRS parameters comprise an SRS bandwidth parameter.

4. The method of claim 1 , wherein the wireless device transmits the SRS in parallel with the one or more transport blocks when:

the ending symbol field indicates that the PUSCH is transmitted in the last symbol; and

the SRS field indicates the SRS is transmitted in the subframe.

5. The method of claim 1 , further comprising performing a second listen before talk procedure indicating that a channel is clear before transmitting in the subframe.

6. The method of claim 1 , wherein the DCI is associated with a cell radio network temporary identifier (C-RNTI) of the wireless device.

7. A method comprising:

receiving one or more radio resource control (RRC) messages comprising configuration parameters for a licensed assisted access (LAA) cell;

receiving a downlink control information (DCI) indicating uplink resources for an uplink burst comprising a number of a plurality of consecutive uplink subframes of the LAA cell, the DCI comprising:

the number of the plurality of consecutive uplink subframes in the uplink burst;

an assignment of a plurality of resource blocks;

a sounding reference signal (SRS) request field indicating whether an SRS is transmitted in a last symbol of the uplink burst; and

an ending symbol field for a physical uplink shared channel (PUSCH) indicating whether the PUSCH is not transmitted in the last symbol of the uplink burst for a listen before talk procedure to be performed during the last symbol of the uplink burst; and

transmitting, via the plurality of resource blocks used across the plurality of consecutive uplink subframes, one or more transport blocks in the PUSCH according to the ending symbol field.

8. The method of claim 7 , wherein the ending symbol field is one bit.

9. The method of claim 7 , wherein the DCI further comprises at least one of:

a modulation and coding scheme;

a hybrid automatic repeat request (HARQ) identifier;

a redundancy version (RV);

a transmit power control (TPC) command; or

a new data indicator (NDI).

10. The method of claim 7 , wherein the listen before talk procedure indicates that a channel is clear when a detected channel energy is below a threshold.

11. The method of claim 7 , wherein one or more parameters of the listen before talk procedure depend on a priority class.

12. The method of claim 7 , further comprising transmitting the SRS in the last symbol of the uplink burst according to the SRS request field.

13. The method of claim 7 , wherein the one or more RRC messages comprise one or more consecutive uplink subframe allocation configuration parameters comprising a first field, the first field indicating an upper limit for the number of the plurality of consecutive uplink subframes.

14. 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;

receive a downlink control information (DCI) indicating uplink resources for an uplink burst comprising a number of a plurality of consecutive uplink subframes of the LAA cell, the DCI comprises:

the number of the plurality of consecutive uplink subframes in the uplink burst;

an assignment of a plurality of resource blocks;

a sounding reference signal (SRS) request field indicating whether an SRS is transmitted in a last symbol of the uplink burst; and

an ending symbol field for a physical uplink shared channel (PUSCH) indicating whether the PUSCH is not transmitted in the last symbol of the uplink burst for a listen before talk procedure to be performed during the last symbol of the subframe; and

transmit, via the plurality of resource blocks used across the plurality of consecutive uplink subframes, one or more transport blocks in the PUSCH according to the ending symbol field.

15. The wireless device of claim 14 , wherein the ending symbol field is one bit.

16. The wireless device of claim 14 , wherein the DCI further comprises at least one of:

a modulation and coding scheme;

a hybrid automatic repeat request (HARQ) identifier;

a redundancy version (RV);

a transmit power control (TPC) command; or

a new data indicator (NDI).

17. The wireless device of claim 14 , wherein the listen before talk procedure indicates that a channel is clear when a detected channel energy is below a threshold.

18. The wireless device of claim 14 , wherein one or more parameters of the listen before talk procedure depends on a priority class.

19. The wireless device of claim 14 , wherein, the instructions, when executed by the one or more processors, further cause the wireless device to transmit the SRS in the last symbol of the uplink burst according to the SRS request field.

20. The wireless device of claim 14 , wherein the one or more RRC messages comprise one or more consecutive uplink subframe allocation configuration parameters comprising a first field, the first field indicating an upper limit for the number of the one or more consecutive uplink subframes.