Transmission power in a wireless device and wireless network

1. A method comprising:

receiving one or more messages comprising configuration parameters of at least one licensed primary cell of a primary timing advance group (TAG) and a plurality of unlicensed secondary cells of a secondary TAG, the plurality of unlicensed secondary cells comprising a first unlicensed secondary cell and a second unlicensed secondary cell;

selecting both the first and second unlicensed secondary cells to jointly serve as reference cells for pathloss measurement of the second unlicensed secondary cell that is different from the first unlicensed secondary cell, wherein the selecting is based on:

the first and second unlicensed secondary cells being activated unlicensed secondary cells; and

the first unlicensed secondary cell and the second unlicensed secondary cell being in a same TAG;

measuring a pathloss reference value for the second unlicensed secondary cell based on:

a received signal power of the first unlicensed secondary cell; and

a received signal power of the second unlicensed secondary cell;

receiving a plurality of downlink control information (DCIS) indicating a plurality of grants for transmission of uplink transport blocks on the second unlicensed secondary cell;

performing a listen before talk procedure to determine whether a channel associated with the second unlicensed secondary cell is clear; and

transmitting the uplink transport blocks on the second unlicensed secondary cell; and

wherein a transmission power of the uplink transport blocks on the second unlicensed secondary cell is calculated employing the pathloss reference value.

2. The method of claim 1 , wherein the second unlicensed secondary cell comprises a second uplink unlicensed cell and a second downlink unlicensed cell.

3. The method of claim 1 , wherein the first unlicensed secondary cell and the second unlicensed secondary cell are in a same frequency band.

4. The method of claim 1 , further comprising measuring the pathloss reference value based on a third unlicensed cell.

5. The method of claim 1 , wherein the one or more messages comprise dedicated uplink power control parameters.

6. The method of claim 1 , wherein the one or more messages comprise a transmit power of the first unlicensed secondary cell.

7. The method of claim 1 , wherein a transmission power of a random access preamble on the second unlicensed secondary cell is calculated employing the pathloss reference value.

8. 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 messages comprising configuration parameters of at least one licensed primary cell of a primary timing advance group (TAG) and a plurality of unlicensed secondary cells of a secondary TAG, the plurality of unlicensed secondary cells comprising a first unlicensed secondary cell and a second unlicensed secondary cell;

select both the first and second unlicensed secondary cells to jointly serve as reference cells for pathloss measurement of the second unlicensed secondary cell that is different from the first unlicensed secondary cell, wherein both the first and second unlicensed secondary cells are selected for the pathloss measurement based on:

the first and second unlicensed secondary cells being activated unlicensed cells; and

the first unlicensed secondary cell and the second unlicensed secondary cell being in a same TAG;

measure a pathloss reference value for the second unlicensed secondary cell based on:

a received signal power of the first unlicensed secondary cell; and

a received signal power of the second unlicensed secondary cell;

receive a plurality of downlink control information (DCIS) indicating a plurality of grants for transmission of uplink transport blocks on the second unlicensed secondary cell;

perform a listen before talk procedure to determine whether a channel associated with the second unlicensed secondary cell is clear; and

transmit the uplink transport blocks on the second unlicensed secondary cell; and

wherein a transmission power of the uplink transport blocks on the second unlicensed secondary cell is calculated employing the pathloss reference value.

9. The wireless device of claim 8 , wherein the second unlicensed secondary cell comprises a second uplink unlicensed cell and a second downlink unlicensed cell.

10. The wireless device of claim 8 , wherein the first unlicensed secondary cell and the second unlicensed secondary cell are in a same frequency band.

11. The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to measure the pathloss reference value based on a third unlicensed cell.

12. The wireless device of claim 8 , wherein the one or more messages comprise dedicated uplink power control parameters.

13. The wireless device of claim 8 , wherein the one or more messages comprise a transmit power of the first unlicensed secondary cell.

14. The wireless device of claim 8 , wherein a transmission power of a random access preamble on the second unlicensed secondary cell is calculated employing the pathloss reference value.

15. A method comprising:

receiving one or more messages comprising configuration parameters of at least one licensed primary cell of a primary timing advance group (TAG) and a plurality of unlicensed secondary cells of a secondary TAG, the plurality of unlicensed secondary cells comprising a first unlicensed secondary cell and a second unlicensed secondary cell different from the first unlicensed secondary cell;

selecting both the first and second unlicensed secondary cells to jointly serve as reference cells for pathloss measurement of the first unlicensed secondary cell based on:

the first and second unlicensed secondary cells being activated unlicensed secondary cells; and

the second unlicensed secondary cell being in a same TAG as the first unlicensed secondary cell;

measuring a first received signal power of the first unlicensed secondary cell and a second received signal power of the second unlicensed secondary cell;

receiving a plurality of downlink control information (DCIS) indicating a plurality of grants for transmission of uplink transport blocks on the first unlicensed secondary cell;

performing a listen before talk procedure to determine whether a channel associated with the first unlicensed secondary cell is clear; and

transmitting the uplink transport blocks on the first unlicensed secondary cell; and

wherein a transmission power of the uplink transport blocks on the first unlicensed secondary cell is calculated employing, at least, the first received signal power and the second received signal power.

16. The method of claim 15 , wherein the first received signal and the second received signal are one of the following:

a synchronization signal;

a discovery signal; or

a reference signal.

17. The method of claim 15 , wherein the one or more messages comprise dedicated uplink power control parameters.

18. The method of claim 15 , wherein the one or more messages comprise a first transmit power parameter of the first unlicensed secondary cell and a second transmit power parameter of the second unlicensed secondary cell.

19. The method of claim 15 , wherein the first unlicensed secondary cell comprises a first uplink unlicensed cell and a first downlink unlicensed cell.

20. The method of claim 15 , wherein the first unlicensed secondary cell and the second unlicensed secondary cell are in a same cell group.