Channel state information feedback for multiple transmission reception points
A wireless device receives, from a base station, configuration parameters indicating channel state information (CSI) resources for a cell and a periodicity of semi persistent (SP) CSI reports. The wireless device receives an SP CSI report activation media access control control element (MAC CE) indicating the SP CSI reports. The wireless device transmits, to the base station in response to the SP CSI report activation MAC CE and based on the periodicity, reference signal received power (RSRP) values for the SP CSI reports determined based on the CSI resources.
1. A method comprising:
receiving, by a wireless device from a base station, configuration parameters indicating:
channel state information (CSI) resources for a cell; and
a periodicity of semi persistent (SP) CSI reports, wherein the periodicity corresponds to a plurality of transmission and reception points (TRPs);
receiving an SP CSI report activation media access control control element (MAC CE) indicating the SP CSI reports; and
transmitting, to the base station in response to the SP CSI report activation MAC CE and based on the periodicity of the SP CSI reports, a codeword comprising reference signal received power (RSRP) values for the SP CSI reports determined based on the CSI resources.
2. The method of claim 1 , wherein the CSI resources are associated with transmission reception points.
3. The method of claim 1 , wherein the CSI resources comprise:
multiple periodic CSI reference signals; or
multiple SP CSI reference signals.
4. The method of claim 1 , further comprising receiving a media access control control element activating multiple SP CSI reference signals of the CSI resources.
5. The method of claim 1 , further comprising receiving a media access control control element activating a SP CSI reporting via a physical uplink control channel (PUCCH).
6. The method of claim 5 , wherein the RSRP values are transmitted via the PUCCH with a PUCCH resource.
7. The method of claim 1 , further comprising receiving one or more downlink control information indicating:
a first SP CSI report, of the SP CSI reports, for a first transmission reception point (TRP); and
a second SP CSI report, of the SP CSI reports, for a second TRP.
8. The method of claim 1 , wherein the RSRP values are transmitted via a physical uplink shared channel (PUSCH).
9. The method of claim 1 , wherein the RSRP values are determined further based on measurements of the CSI resources.
10. The method of claim 9 , wherein the measurements of the CSI resources comprise measurements of:
periodic reference signals of the CSI resources; or
SP reference signals of the CSI resources.
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, from a base station, configuration parameters indicating:
channel state information (CSI) resources for a cell; and
a periodicity of semi persistent (SP) CSI reports, wherein the periodicity corresponds to a plurality of transmission and reception points (TRPs);
receive an SP CSI report activation media access control control element (MAC CE) indicating the SP CSI reports; and
transmit, to the base station in response to the SP CSI report activation MAC CE and based on the periodicity of the SP CSI reports, a codeword comprising reference signal received power (RSRP) values for the SP CSI reports determined based on the CSI resources.
12. The wireless device of claim 11 , wherein the CSI resources are associated with transmission reception points.
13. The wireless device of claim 11 , wherein the CSI resources comprise:
multiple periodic CSI reference signals; or
multiple SP CSI reference signals.
14. The wireless device of claim 11 , wherein the instructions further cause the wireless device to receive a media access control control element activating multiple SP CSI reference signals of the CSI resources.
15. The wireless device of claim 11 , wherein the instructions further cause the wireless device to receive a media access control control element activating a SP CSI reporting via a physical uplink control channel (PUCCH).
16. The wireless device of claim 15 , wherein the RSRP values are transmitted via the PUCCH with a PUCCH resource.
17. The wireless device of claim 11 , wherein the instructions further cause the wireless device to receive one or more downlink control information indicating:
a first SP CSI report, of the SP CSI reports, for a first transmission reception point (TRP); and
a second SP CSI report, of the SP CSI reports, for a second TRP.
18. The wireless device of claim 11 , wherein the RSRP values are transmitted via a physical uplink shared channel (PUSCH).
19. The wireless device of claim 11 , wherein the RSRP values are determined further based on measurements of the CSI resources.
20. A non-transitory computer-readable medium storing instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
receive, from a base station, configuration parameters indicating:
channel state information (CSI) resources for a cell; and
a periodicity of semi persistent (SP) CSI reports, wherein the periodicity corresponds to a plurality of transmission and reception points (TRPs);
receive an SP CSI report activation media access control control element (MAC CE) indicating the SP CSI reports; and
transmit, to the base station in response to the SP CSI report activation MAC CE and based on the periodicity of the SP CSI reports, a codeword comprising reference signal received power (RSRP) values for the SP CSI reports determined based on the CSI resources.