Downlink control signaling for uplink transmission in a wireless network

1. A method comprising:

receiving a downlink control information comprising:

a number of subframes field indicating a first number of subframes;

a modulation and coding scheme field;

a transmit power control field; and

a listen before talk (LBT) field indicating timing information for performing an LBT procedure;

performing the LBT procedure for transmission in the first number of subframes based on the timing information;

determining a transmission power of each subframe in the first number of subframes based on a same closed loop adjustment factor and the transmit power control field, wherein the transmission power of each subframe of the first number of subframes is adjusted in response to a total transmit power for each subframe of the first number of subframes exceeding a power value; and

transmitting, in each subframe of the first number of subframes, employing the modulation and coding scheme field.

2. The method of claim 1 , wherein the transmission power of each subframe in the first number of subframes is further determined based on a pathloss value.

3. The method of claim 1 , wherein the receiving the downlink control information further comprises:

receiving a first downlink control information via a wireless device specific search space of a first control channel; and

receiving a second downlink control information via a common search space of a second control channel of a licensed assisted access cell, wherein the first number of subframes are subframes of the licensed assisted access cell.

4. The method of claim 1 , wherein the downlink control information further comprises a cyclic shift field applicable to the first number of subframes, the cyclic shift employed for transmitting a demodulation reference signal.

5. The method of claim 1 , wherein the downlink control information further comprises a hybrid automatic repeat request (HARQ) identifier.

6. The method of claim 1 , wherein the determining the transmission power of each subframe in the first number of subframes is further performed based on a measured pathloss value.

7. The method of claim 1 , wherein a calculation of the closed loop adjustment factor employs a transmit power control command in the transmit power control field.

8. The method of claim 1 , wherein the LBT procedure indicates that a channel is clear when a detected channel energy is below a threshold.

9. The method of claim 1 , wherein each subframe in the first number of subframes is associated with a different hybrid automatic repeat request (HARQ) process identifier.

10. The method of claim 1 , wherein the downlink control information further comprises a redundancy version field for each of the first number of subframes.

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 a downlink control information comprising:

a number of subframes field indicating a first number of subframes;

a modulation and coding scheme field;

a transmit power control field; and

a listen before talk (LBT) field indicating timing information for performing an LBT procedure;

perform the LBT procedure for transmission in the first number of subframes based on the timing information;

determine a transmission power of each subframe in the first number of subframes based on a same closed loop adjustment factor and the transmit power control field, wherein the transmission power of each subframe of the first number of subframes is adjusted in response to a total transmit power for each subframe of the first number of subframes exceeding a power value; and

transmit, in each subframe of the first number of subframes, employing the modulation and coding scheme field.

12. The wireless device of claim 11 , wherein the transmission power of each subframe in the first number of subframes is determined based on a pathloss value.

13. The wireless device of claim 11 , wherein the downlink control information comprises:

a first DCI received via a wireless device specific search space of a first control channel; and

a second DCI received via a common search space of a second control channel of a licensed assisted access cell, wherein the first number of subframes are subframes of the licensed assisted access cell.

14. The wireless device of claim 11 , wherein the downlink control information further comprises a cyclic shift field applicable to the first number of subframes, the cyclic shift employed for transmitting a demodulation reference signal.

15. The wireless device of claim 11 , wherein the downlink control information further comprises a hybrid automatic repeat request (HARQ) identifier.

16. The wireless device of claim 11 , wherein the transmission power of each subframe in the first number of subframes is further determined based on a measured pathloss value.

17. The wireless device of claim 11 , wherein a calculation of the closed loop adjustment factor employs a transmit power control command in the transmit power control field.

18. The wireless device of claim 11 , wherein the LBT procedure indicates that a channel is clear when a detected channel energy is below a threshold.

19. The wireless device of claim 11 , wherein each subframe in the first number of subframes is associated with a different hybrid automatic repeat request (HARQ) process identifier.

20. The wireless device of claim 11 , wherein the downlink control information further comprises a redundancy version field for each of the first number of subframes.