Bandwidth part management in a wireless system

1. A method comprising:

receiving, via a physical downlink control channel (PDCCH) by a wireless device, a downlink control information (DCI) indicating switching from a second bandwidth part (BWP) to a first BWP as an active BWP; and

transmitting, in response to activating the first BWP based on the DCI, a reference signal received power (RSRP) report for the first BWP, wherein the RSRP report comprises:

a reference signal index indicating a reference signal of the first BWP; and

a value of an RSRP of the reference signal.

2. The method of claim 1 , further comprising receiving, from a base station, one or more radio resource control (RRC) messages indicating parameters of:

a first PDCCH and the reference signal, both corresponding to the first BWP; and

the PDCCH and a second reference signal, both corresponding to the second BWP.

3. The method of claim 2 , wherein the parameters are configuration parameters of a primary cell of a plurality of cells.

4. The method of claim 2 , wherein the parameters are configuration parameters of a secondary cell of a plurality of cells.

5. The method of claim 2 , wherein the one or more RRC messages further indicate BWP parameters comprising at least one of:

a frequency location;

a bandwidth;

a value of subcarrier spacing; and

a cyclic prefix.

6. The method of claim 2 , further comprising:

measuring, for radio resource management (RRM) and based on the one or more RRC messages, a synchronization signal/physical broadcast channel (SS/PBCH) block or a channel state information reference signal (CSI-RS); and

transmitting, to the base station, an RRM report based on the measuring.

7. The method of claim 1 , further comprising, after the activating the first BWP based on the DCI, monitoring a first PDCCH on the first BWP.

8. The method of claim 7 , further comprising:

receiving a first DCI via the first PDCCH; and

receiving a first transport block, based on the first DCI, via the first BWP.

9. The method of claim 1 , further comprising measuring the reference signal, wherein the value of the RSRP of the reference signal is based on the measuring.

10. The method of claim 1 , wherein the reference signal comprises at least one of:

one or more channel state information reference signals; or

one or more synchronization signal blocks.

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, via a physical downlink control channel (PDCCH) a downlink control information (DCI) indicating switching from a second bandwidth part (BWP) to a first BWP as an active BWP; and

transmit, in response to activating the first BWP based on the DCI, a reference signal received power (RSRP) report for the first BWP, wherein the RSRP report comprises:

a reference signal index indicating a reference signal of the first BWP; and

a value of an RSRP of the reference signal.

12. The wireless device of claim 11 , wherein the instructions further cause the wireless device to receive, from a base station, one or more radio resource control (RRC) messages indicating parameters of:

a first PDCCH and the reference signal, both corresponding to the first BWP; and

the PDCCH and a second reference signal, both corresponding to the second BWP.

13. The wireless device of claim 12 , wherein the parameters are configuration parameters of a primary cell of a plurality of cells.

14. The wireless device of claim 12 , wherein the parameters are configuration parameters of a secondary cell of a plurality of cells.

15. The wireless device of claim 12 , wherein the one or more RRC messages further indicate BWP parameters comprising at least one of:

a frequency location;

a bandwidth;

a value of subcarrier spacing; and

a cyclic prefix.

16. The wireless device of claim 12 , wherein the instructions further cause the wireless device to:

measure, for radio resource management (RRM) and based on the one or more RRC messages, a synchronization signal/physical broadcast channel (SS/PBCH) block or a channel state information reference signal (CSI-RS); and

transmit, to the base station, an RRM report based on measuring the SS/PBCH block or the CSI-RS.

17. The wireless device of claim 12 , wherein the instructions further cause the wireless device to measure the reference signal, wherein the value of the RSRP of the reference signal is based on measuring the reference signal, and the reference signal comprises at least one of:

one or more channel state information reference signals; or

one or more synchronization signal blocks.

18. The wireless device of claim 11 , wherein the instructions, after activating the first BWP based on the DCI, further cause the wireless device to monitor the first PDCCH on the first BWP.

19. The wireless device of claim 18 , wherein the instructions further cause the wireless device to:

receive a first DCI via the first PDCCH; and

receive a first transport block, based on the first DCI, via the first BWP.

20. A system comprising:

a wireless device comprising:

one or more first processors; and

first memory storing first instructions that, when executed by the one or more first processors, cause the wireless device to:

receive, via a physical downlink control channel (PDCCH) by the wireless device, a downlink control information (DCI) indicating switching from a second bandwidth part (BWP) to a first BWP as an active BWP; and

transmit, in response to activating the first BWP based on the DCI, a reference signal received power (RSRP) report for the first BWP, wherein the RSRP report comprises:

a reference signal index indicating a reference signal of the first BWP; and

a value of an RSRP of the reference signal; and

a base station comprising:

one or more second processors; and

second memory storing second instructions that, when executed by the one or more second processors, cause the base station to:

transmit the DCI; and

receive the RSRP report.