Uplink grant for consecutive uplink subframes in a wireless device

1. A method comprising:

receiving, by a wireless device, an uplink grant message of Physical Uplink Shared Channel (PUSCH) transmission in a Licensed Assisted Access (LAA) cell, comprising:

a field indicating a number of consecutive uplink subframes allocated for a PUSCH transmission;

an assignment of resource blocks corresponding to the consecutive uplink subframes; and

a power control command;

determining a first transmission power of the PUSCH transmission in each subframe of the consecutive uplink subframes based on the power control command;

transmitting, using the first transmission power in each subframe, the PUSCH transmission in each subframe if the first transmission power in each subframe does not exceed a maximum allowed power value in each subframe; and

transmitting, using a second transmission power which does not exceed the maximum allowed power value, the PUSCH transmission in each subframe if the first transmission power in each subframe exceeds the maximum allowed power value in each subframe.

2. The method of claim 1 , wherein the uplink grant message further comprises:

a modulation and coding scheme;

a hybrid automatic repeat request (HARQ) identifier;

a redundancy version (RV); or

a new data indicator (NDI).

3. The method of claim 1 , wherein the number of the consecutive uplink subframes is less than a number of hybrid automatic repeat request (HARQ) processes supported by a wireless device.

4. The method of claim 1 , wherein the first transmission power is based on a measured pathloss value.

5. The method of claim 1 , wherein the first transmission power is based on a same closed loop adjustment factor, the closed loop adjustment factor calculated based on the power control command.

6. The method of claim 1 , further comprising performing a listen before talk procedure indicating that a channel is clear for a starting subframe of the consecutive uplink subframes, wherein the listen before talk procedure indicates that the channel is clear when a detected channel energy is below a threshold.

7. The method of claim 1 , wherein the PUSCH transmission is associated with an asynchronous hybrid automatic repeat request (HARQ) process.

8. The method of claim 1 , wherein each subframe of the consecutive uplink subframes is associated with a hybrid automatic repeat request (HARQ) identifier, the HARQ identifier depending on a position of a subframe in the consecutive uplink subframes.

9. The method of claim 1 , further comprising transmitting a sounding reference signal (SRS) in a subframe of the consecutive uplink subframes, wherein a transmission power of the SRS is calculated employing the power control command.

10. 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 an uplink grant message of Physical Uplink Shared Channel (PUSCH) transmission in a Licensed Assisted Access (LAA) cell, comprising:

a field indicating a number of consecutive uplink subframes allocated for a PUSCH transmission;

an assignment of resource blocks corresponding to the consecutive uplink subframes; and

a power control command;

determine a first transmission power of the PUSCH transmission in each subframe of the consecutive uplink subframes based on the power control command;

transmit, using the first transmission power in each subframe, the PUSCH transmission in each subframe if the first transmission power in each subframe does not exceed a maximum allowed power value in each subframe; and

transmitting, using a second transmission power which does not exceed the maximum allowed power value, the PUSCH transmission in each subframe if the first transmission power in each subframe exceeds the maximum allowed power value in each subframe.

11. The wireless device of claim 10 , wherein the uplink grant message further comprises:

a modulation and coding scheme;

a hybrid automatic repeat request (HARQ) identifier;

a redundancy version (RV); or

a new data indicator (NDI).

12. The wireless device of claim 10 , wherein the number of the consecutive uplink subframes is less than a number of hybrid automatic repeat request (HARQ) processes supported by a wireless device.

13. The wireless device of claim 10 , wherein the first transmission power is based on a measured pathloss value.

14. The wireless device of claim 10 , wherein the first transmission power is based on a same closed loop adjustment factor, the closed loop adjustment factor calculated based on the power control command.

15. The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to perform a listen before talk procedure indicating that a channel is clear for a starting subframe of the consecutive uplink subframes, wherein the listen before talk procedure indicates that the channel is clear when a detected channel energy is below a threshold.

16. The wireless device of claim 10 , wherein the PUSCH transmission is associated with an asynchronous hybrid automatic repeat request (HARQ) process.

17. The wireless device of claim 10 , wherein each subframe of the consecutive uplink subframes is associated with a hybrid automatic repeat request (HARQ) identifier, the HARQ identifier depending on a position of a subframe in the consecutive uplink subframes.

18. The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit a sounding reference signal (SRS) in a subframe of the consecutive uplink subframes, wherein a transmission power of the SRS is calculated employing the power control command.