Transmitting uplink signals with transmission timing derived based on a secondary cell being activated and licensed
A wireless device receives configuration parameters of timing advance groups (TAGs) comprising: a primary TAG comprising a primary cell; and a secondary TAG comprising one or more licensed secondary cells and one or more unlicensed secondary cells. Uplink signals are transmitted via the secondary TAG. The transmission timing is derived employing a first secondary cell, of the secondary TAG, that is based on the first secondary cell being: an activated secondary cell; and a licensed secondary cell.
1. A method comprising:
receiving, by a wireless device, configuration parameters of timing advance groups (TAGs) comprising:
a primary TAG comprising a primary cell; and
a secondary TAG comprising one or more licensed secondary cells and one or more unlicensed secondary cells; and
transmitting uplink signals via the secondary TAG with transmission timing derived employing a first secondary cell, of the secondary TAG, that is based on the first secondary cell being:
an activated secondary cell; and
a licensed secondary cell.
2. The method of claim 1 , further comprising selecting the first secondary cell among the one or more licensed secondary cells and one or more unlicensed secondary cells.
3. The method of claim 1 , further comprising receiving at least one activation command to activate:
the one or more licensed secondary cells; and
the one or more unlicensed secondary cells.
4. The method of claim 3 , wherein the at least one activation command comprises a media access control (MAC) activation command.
5. The method of claim 4 , wherein an unlicensed cell of the one or more unlicensed secondary cells comprises a licensed assisted access (LAA) cell.
6. The method of claim 5 , wherein the configuration parameters comprise a TAG index.
7. The method of claim 6 , further comprising receiving a timing advance command comprising the TAG index and a timing advance value.
8. The method of claim 7 , wherein configuration parameters comprise a time alignment timer parameter for the secondary TAG.
9. The method of claim 8 , further comprising applying the timing advance value to uplink transmission timing of a TAG identified by the TAG index.
10. The method of claim 9 , further comprising selecting an unlicensed cell in a first TAG as a first timing reference cell based on:
the first TAG not comprising a licensed cell; or
the first TAG not comprising an activated licensed 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 timing advance groups (TAGs) comprising:
a primary TAG comprising a primary cell; and
a secondary TAG comprising one or more licensed secondary cells and one or more unlicensed secondary cells; and
transmit uplink signals via the secondary TAG with transmission timing derived employing a first secondary cell, of the secondary TAG, that is based on the first secondary cell being:
an activated secondary cell; and
a licensed secondary cell.
12. The wireless device of claim 11 , further comprising selecting the first secondary cell among the one or more licensed secondary cells and one or more unlicensed secondary cells.
13. The wireless device of claim 11 , further comprising receiving at least one activation command to activate:
the one or more licensed secondary cells; and
the one or more unlicensed secondary cells.
14. The wireless device of claim 13 , wherein the at least one activation command comprises a media access control (MAC) activation command.
15. The wireless device of claim 14 , wherein an unlicensed cell of the one or more unlicensed secondary cells comprises a licensed assisted access (LAA) cell.
16. The wireless device of claim 15 , wherein the configuration parameters comprise a TAG index.
17. The wireless device of claim 16 , further comprising receiving a timing advance command comprising the TAG index and a timing advance value.
18. The wireless device of claim 17 , wherein configuration parameters comprise a time alignment timer parameter for the secondary TAG.
19. The wireless device of claim 18 , further comprising applying the timing advance value to uplink transmission timing of a TAG identified by the TAG index.
20. A system comprising:
a base station comprising:
one or more first processors; and
first memory storing first instructions that, when executed by the one or more first processors, cause the base station to transmit configuration parameters of timing advance groups (TAGs) comprising:
a primary TAG comprising a primary cell; and
a secondary TAG comprising one or more licensed secondary cells and one or more unlicensed secondary cells; and
a wireless device comprising:
one or more second processors; and
memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to:
receive the configuration parameters; and
transmit uplink signals via the secondary TAG with transmission timing derived employing a first secondary cell, of the secondary TAG, that is based on the first secondary cell being:
an activated secondary cell; and
a licensed secondary cell.