Pathloss measurement using multiple unlicensed cells
A wireless device receives configuration parameters of a primary timing advance group (TAG) and a secondary TAG comprising a first unlicensed secondary cell and a second unlicensed secondary cell. The wireless device selects both the first and second unlicensed secondary cells to jointly serve as pathloss reference cells, wherein the selecting is based on the first and second unlicensed secondary cells being activated unlicensed secondary cells and in a same secondary TAG. The wireless device transmits, via the second unlicensed secondary cell, a transport block with a transmission power, wherein a pathloss reference value of the transmission power is based on a joint measurement of a received signal power of the first unlicensed secondary cell and a received signal power of the second unlicensed secondary cell.
1. A method comprising:
receiving configuration parameters of:
a primary timing advance group (TAG); and
a secondary TAG 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 pathloss reference cells, wherein the selecting is based on the first and second unlicensed secondary cells being:
activated unlicensed secondary cells; and
in a same secondary TAG; and
transmitting, via the second unlicensed secondary cell, a transport block with a transmission power, wherein a pathloss reference value of the transmission power is based on a joint measurement of:
a received signal power of the first unlicensed secondary cell; and
a received signal power of the second unlicensed secondary cell.
2. The method of claim 1 , wherein the primary timing advance group (TAG) comprises a primary cell.
3. The method of claim 1 wherein the second unlicensed secondary cell comprises a second uplink unlicensed cell and a second downlink unlicensed cell.
4. The method of claim 1 , wherein the first unlicensed secondary cell and the second unlicensed secondary cell are in a same frequency band.
5. The method of claim 1 , further comprising measuring the pathloss reference value based on a third unlicensed cell.
6. The method of claim 1 , further comprising receiving dedicated uplink power control parameters.
7. The method of claim 1 , further comprising receiving a transmit power of the first unlicensed secondary cell.
8. The method of claim 1 , further comprising determining whether a channel associated with the second unlicensed secondary cell is clear.
9. The method of claim 1 , wherein the first and second received signal powers are for at least one of the following:
a synchronization signal;
a discovery signal; or
a reference signal.
10. The method of claim 1 , further comprising receiving a plurality of downlink control information (DCIS) indicating a plurality of grants for transmission of uplink transport blocks on the first unlicensed cell.
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 configuration parameters of:
a primary timing advance group (TAG); and
a secondary TAG 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 pathloss reference cells, wherein the selecting is based on the first and second unlicensed secondary cells being:
activated unlicensed secondary cells; and
in a same secondary TAG; and
transmit, via the second unlicensed secondary cell, a transport block with a transmission power, wherein a pathloss reference value of the transmission power is based on a joint measurement of:
a received signal power of the first unlicensed secondary cell; and
a received signal power of the second unlicensed secondary cell.
12. The wireless device of claim 11 , wherein the primary timing advance group (TAG) comprises a primary cell.
13. The wireless device of claim 11 wherein the second unlicensed secondary cell comprises a second uplink unlicensed cell and a second downlink unlicensed cell.
14. The wireless device of claim 11 , wherein the first unlicensed secondary cell and the second unlicensed secondary cell are in a same frequency band.
15. The wireless device of claim 11 , further comprising measuring the pathloss reference value based on a third unlicensed cell.
16. The wireless device of claim 11 , further comprising receiving dedicated uplink power control parameters.
17. The wireless device of claim 11 , further comprising receiving a transmit power of the first unlicensed secondary cell.
18. The wireless device of claim 11 , further comprising determining whether a channel associated with the second unlicensed secondary cell is clear.
19. The wireless device of claim 11 , wherein the first and second received signal powers are for at least one of the following:
a synchronization signal;
a discovery signal; or
a reference signal.
20. The wireless device of claim 11 , further comprising receiving a plurality of downlink control information (DCIS) indicating a plurality of grants for transmission of uplink transport blocks on the first unlicensed cell.