Channel state information transmission
View Patent ↗A plurality of cells comprise a PUCCH secondary cell with a secondary PUCCH. The wireless device receives, in subframe n, a media-access-control control element indicating activation of the PUCCH secondary cell. The wireless device starts transmission of channel state information (CSI) fields for the PUCCH secondary cell from subframe n+8+k. k is an integer depending, at least in part, on when the PUCCH secondary cell is successfully detected by the wireless device.
1. A method comprising:
receiving, by a wireless device, at least one message comprising configuration parameters of a plurality of cells, the plurality of cells grouped into a plurality of physical uplink control channel (PUCCH) groups comprising:
a primary PUCCH group comprising a primary cell with a primary PUCCH; and
a secondary PUCCH group comprising a PUCCH secondary cell with a secondary PUCCH;
receiving, in subframe m, a first media-access-control control element (MAC CE) indicating activation of a secondary cell in the primary PUCCH group;
starting transmission of channel state information (CSI) fields of the secondary cell from subframe m+8;
receiving, in subframe n, a second MAC CE indicating activation of the PUCCH secondary cell; and
starting transmission of CSI fields for the PUCCH secondary cell from subframe n+8+k, wherein k is an integer depending, at least in part, on when the PUCCH secondary cell is successfully detected by the wireless device.
2. The method of claim 1 , further comprising:
starting a first deactivation timer associated with the secondary cell in subframe m+8; and
starting a second deactivation timer associated with the PUCCH secondary cell in subframe n+8.
3. The method of claim 1 , further comprising starting transmission of CSI fields of a first secondary cell in the secondary PUCCH group from subframe n+8+k, wherein the second MAC CE further indicates activation of the first secondary cell.
4. The method of claim 1 , wherein the wireless device employs a next available uplink resource for transmitting the CSI fields if there are no uplink resources for transmitting a CSI field of the CSI fields for the PUCCH secondary cell in subframe n+8+k.
5. The method of claim 1 , further comprising starting transmission of CSI fields of an activated cell in the secondary PUCCH group from subframe n+8+k.
6. The method of claim 1 , wherein the PUCCH secondary cell remains detectable during a cell activation delay.
7. The method of claim 1 , wherein the PUCCH secondary cell is detected on a first attempt.
8. The method of claim 1 , wherein a CSI field comprising an out of range CQI is transmitted when no valid CSI field with a channel quality index (CQI) different from zero is available.
9. A method comprising:
receiving, by a wireless device from a base station, at least one message comprising configuration parameters of a plurality of cells, the plurality of cells grouped into a plurality of physical uplink control channel (PUCCH) groups comprising:
a primary PUCCH group comprising a primary cell with a primary PUCCH; and
a secondary PUCCH group comprising a PUCCH secondary cell with a secondary PUCCH;
receiving, in subframe m, a first media-access-control control element (MAC CE) indicating activation of a plurality of secondary cells comprising:
a secondary cell in the primary PUCCH group; and
the PUCCH secondary cell;
starting transmission of channel state information (CSI) fields of the secondary cell in the primary PUCCH group from subframe m+8; and
starting transmission of CSI fields for the PUCCH secondary cell from subframe m+8+k, wherein k is an integer number depending, at least in part, on when the PUCCH secondary cell is successfully detected by the wireless device.
10. The method of claim 9 , further comprising:
starting a first deactivation timer associated with the secondary cell in subframe m+8; and
starting a second deactivation timer associated with the PUCCH secondary cell in subframe m+8.
11. The method of claim 9 , further comprising starting transmission of CSI fields of a first secondary cell in the secondary PUCCH group from subframe m+8+k, wherein the first MAC CE further indicates activation of the first secondary cell.
12. The method of claim 9 , further comprising transmitting a CSI field comprising an out of range CQI when no valid CSI field with a channel quality index (CQI) different from zero is available.
13. 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 at least one message comprising configuration parameters of a plurality of cells, the plurality of cells grouped into a plurality of physical uplink control channel (PUCCH) groups comprising:
a primary PUCCH group comprising a primary cell with a primary PUCCH; and
a secondary PUCCH group comprising a PUCCH secondary cell with a secondary PUCCH;
receive, in subframe m, a first media-access-control control element (MAC CE) indicating activation of a secondary cell in the primary PUCCH group;
start transmission of channel state information (CSI) fields of the secondary cell from subframe m+8;
receive, in subframe n, a second MAC CE indicating activation of the PUCCH secondary cell; and
start transmission of CSI fields for the PUCCH secondary cell from subframe n+8+k, wherein k is an integer depending, at least in part, on when the PUCCH secondary cell is successfully detected by the wireless device.
14. The wireless device of claim 13 , wherein the instructions, when executed further cause the wireless device to:
start a first deactivation timer associated with the secondary cell in subframe m+8; and
start a second deactivation timer associated with the PUCCH secondary cell in subframe n+8.
15. The wireless device of claim 13 , wherein the instructions, when executed further cause the wireless device to start transmission of CSI fields of a first secondary cell in the secondary PUCCH group from subframe n+8+k, wherein the second MAC CE further indicates activation of the first secondary cell.
16. The wireless device of claim 13 , wherein the wireless device employs a next available uplink resource for transmitting the CSI fields if there are no uplink resources for transmitting a CSI field of the CSI fields for the PUCCH secondary cell in subframe n+8+k.
17. The wireless device of claim 13 , wherein the instructions, when executed further cause the wireless device to start transmission of CSI fields of an activated cell in the secondary PUCCH group from subframe n+8+k.
18. The wireless device of claim 13 , wherein the PUCCH secondary cell remains detectable during a cell activation delay.
19. The wireless device of claim 13 , wherein the PUCCH secondary cell is detected on a first attempt.
20. The wireless device of claim 13 , wherein a CSI field comprising an out of range CQI is transmitted when no valid CSI field with a channel quality index (CQI) different from zero is available.