Uplink signal transmission in carrier aggregation
View Patent ↗A physical uplink control channel (PUCCH) secondary cell is in a first timing advance group. A wireless device receives a command initiating transmission of a preamble on the first TAG. The wireless device receives a response comprising a timing advance command (TAC) in subframe m. The wireless device starts transmission of uplink signals on the first TAG on or before subframe m+4. The wireless device starts transmission of valid channel state information (CSI) on the PUCCH secondary cell on or after subframe m+6.
1. A method comprising:
receiving at least one message comprising configuration parameters of a plurality of cells, wherein:
the plurality of cells are grouped into a plurality of timing advance groups (TAGs); and
the plurality of cells comprise:
a primary cell with a primary physical uplink control channel (PUCCH); and
a PUCCH secondary cell with a secondary PUCCH, wherein the PUCCH secondary cell is in a first TAG in the plurality of TAGs; and
receiving a command initiating transmission of a preamble on the first TAG;
receiving a response comprising a timing advance command (TAC) in subframe m;
starting transmission of uplink signals on the first TAG on or before subframe m+4; and
starting transmission of valid channel state information (CSI) on the PUCCH secondary cell on or after subframe m+6.
2. The method of claim 1 , further comprising starting a time alignment timer of the first TAG on or before subframe m+4.
3. The method of claim 1 , further comprising adjusting uplink transmission timing on or after subframe m+6.
4. The method of claim 1 , wherein the command is received when a time alignment timer of the first TAG is not running.
5. The method of claim 1 , wherein the uplink signals comprise uplink transport blocks transmitted on a physical uplink shared channel.
6. The method of claim 1 , wherein the uplink signals comprise sounding reference signals.
7. The method of claim 1 , further comprising receiving, in subframe n and before receiving the command, an activation command configured to activate the PUCCH secondary cell and starting a deactivation timer in subframe n+8.
8. The method of claim 1 , wherein the plurality of cells are grouped into a plurality of PUCCH groups comprising:
a primary PUCCH group comprising the primary cell; and
a secondary PUCCH group comprising the PUCCH secondary cell.
9. The method of claim 1 , wherein the CSI is for an activated cell in the secondary PUCCH group.
10. A method comprising:
transmitting at least one message comprising configuration parameters of a plurality of cells, wherein:
the plurality of cells are grouped into a plurality of timing advance groups (TAGs); and
the plurality of cells comprise:
a primary cell with a primary physical uplink control channel (PUCCH); and
a PUCCH secondary cell with a secondary PUCCH, wherein the PUCCH secondary cell in a first TAG in the plurality of TAGs; and
transmitting a command initiating transmission of a preamble on the first TAG;
transmitting a response comprising a timing advance command (TAC) in subframe m;
starting reception of uplink signals on the first TAG before subframe m+4; and
starting reception of valid channel state information (CSI) on the PUCCH secondary cell on or after subframe m+6.
11. The method of claim 10 , further comprising starting a time alignment timer of the first TAG before subframe m+4.
12. The method of claim 10 , further comprising receiving uplink signals with adjusted uplink transmission timing on or after subframe m+6.
13. The method of claim 10 , wherein the command is transmitted when a time alignment timer of the first TAG is not running.
14. The method of claim 10 , wherein the uplink signals comprise uplink transport blocks transmitted on a physical uplink shared channel.
15. The method of claim 10 , wherein the uplink signals comprise sounding reference signals.
16. The method of claim 10 , further comprising transmitting, in subframe n and before transmitting the command, an activation command configured to activate the PUCCH secondary cell for the wireless device and starting a deactivation timer in subframe n+8.
17. The method of claim 10 , wherein the plurality of cells are grouped into a plurality of PUCCH groups comprising:
a primary PUCCH group comprising the primary cell; and
a secondary PUCCH group comprising the PUCCH secondary cell.
18. The method of claim 10 , wherein the CSI is for an activated cell in the secondary PUCCH group.
19. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed, cause the wireless device to:
receive at least one message comprising configuration parameters of a plurality of cells, wherein:
the plurality of cells are grouped into a plurality of timing advance groups (TAGs); and
the plurality of cells comprise:
a primary cell with a primary physical uplink control channel (PUCCH); and
a PUCCH secondary cell with a secondary PUCCH, wherein the PUCCH secondary cell is in a first TAG in the plurality of TAGs; and
receive a command initiating transmission of a preamble on the first TAG;
receiving a response comprising a timing advance command (TAC) in subframe m;
start transmission of uplink signals on the first TAG before subframe m+4; and
start transmission of valid channel state information (CSI) on a PUCCH secondary cell on or after subframe m+6.
20. The wireless device of claim 19 , wherein the instructions, when executed, further cause the wireless device to start a time alignment timer of the first TAG before subframe m+4.