Channel state information reports per bandwidth part of a cell

1. A method comprising:

transmitting, by a wireless device, a plurality of capability messages for a plurality of bandwidth parts of a cell, the plurality of capability messages indicating that the wireless device supports a first number of channel state information (CSI) processes per bandwidth part of the cell, the plurality of bandwidth parts comprising a first bandwidth part;

receiving, based on the wireless device supporting the first number of CSI processes per bandwidth part, CSI configuration parameters indicating a second number of CSI processes for the first bandwidth part, wherein the CSI configuration parameters comprise: parameters configuring a semi-persistent report sent on PUCCH, or a semi-persistent report sent on PUSCH, parameters indicating in which serving cell CSI resource configuration indicated are to be found, and parameters indicating a plurality of CSI reference signal resources, wherein the first number of CSI processes and the second number of CSI processes are different; and

transmitting CSI reports for the second number of CSI processes.

2. The method of claim 1 , further comprising receiving configuration parameters of the plurality of bandwidth parts of the cell.

3. The method of claim 1 , further comprising receiving a downlink control information indicating switching from a second bandwidth part of the cell to the first bandwidth part as an active bandwidth part of the cell, wherein the first bandwidth part is activated in response to receiving the downlink control information and the second bandwidth part is deactivated in response to receiving the downlink control information, wherein the wireless device monitors Physical Downlink Control Channel (PDCCH) to detect the downlink control information.

4. The method of claim 3 , wherein the transmitting the CSI reports is based on the first bandwidth part being the active bandwidth part of the cell.

5. The method of claim 1 , further comprising receiving a downlink control information indicating activation of the first bandwidth part.

6. The method of claim 1 , wherein the second number is smaller than or equal to the first number.

7. The method of claim 1 , wherein the first number of CSI processes is a maximum number of channel state information processes.

8. The method of claim 1 , further comprising receiving an indication of uplink resources of an uplink control channel, wherein the channel state information is transmitted via the uplink control channel.

9. The method of claim 8 , wherein the uplink resources are configured on a primary cell.

10. The method of claim 1 , wherein the channel state information is a periodic channel state information.

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:

transmit a plurality of capability messages for a plurality of bandwidth parts of a cell, the plurality of capability messages indicating that the wireless device supports a first number of channel state information (CSI) processes per bandwidth part of the cell, the plurality of bandwidth parts comprising a first bandwidth part;

receive, based on the wireless device supporting the first number of CSI processes per bandwidth part, CSI configuration parameters indicating a second number of CSI processes for a first bandwidth part, wherein the CSI configuration parameters comprise: parameters configuring a semi-persistent report sent on PUCCH, or a semi-persistent report sent on PUSCH, parameters indicating in which serving cell CSI resource configuration indicated are to be found, and parameters indicating a plurality of CSI reference signal resources, wherein the first number of CSI processes and the second number of CSI processes are different; and

transmit CSI reports for the second number of CSI processes.

12. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive configuration parameters of the plurality of bandwidth parts of the cell.

13. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive a downlink control information indicating switching from a second bandwidth part of the cell to the first bandwidth part as an active bandwidth part of the cell, wherein the first bandwidth part is activated in response to receiving the downlink control information and the second bandwidth part is deactivated in response to receiving the downlink control information, wherein the wireless device monitors Physical Downlink Control Channel (PDCCH) to detect the downlink control information.

14. The wireless device of claim 13 , wherein the transmission of the CSI reports is based on the first bandwidth part being the active bandwidth part of the cell.

15. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive a downlink control information indicating activation of the first bandwidth part.

16. The wireless device of claim 11 , wherein the second number is smaller than or equal to the first number.

17. The wireless device of claim 11 , wherein the first number of CSI processes is a maximum number of channel state information processes.

18. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive an indication of uplink resources of an uplink control channel, wherein the channel state information is transmitted via the uplink control channel.

19. The wireless device of claim 18 , wherein the uplink resources are configured on a secondary cell.

20. A system comprising:

a base station; and

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:

transmit, to the base station, a plurality of capability messages for a plurality of bandwidth parts of a cell, the plurality of capability messages indicating that the wireless device supports a first number of channel state information (CSI) processes per bandwidth part of the cell, the plurality of bandwidth parts comprising a first bandwidth part;

receive, based on the wireless device supporting the first number of CSI processes per bandwidth part, CSI configuration parameters indicating a second number of CSI processes for the first bandwidth part, wherein the CSI configuration parameters comprise: parameters configuring a semi-persistent report sent on PUCCH, or a semi-persistent report sent on PUSCH, parameters indicating in which serving cell CSI resource configuration indicated are to be found, and parameters indicating a plurality of CSI reference signal resources, wherein the first number of CSI processes and the second number of CSI processes are different; and

transmit CSI reports for the second number of CSI processes.