Beam management for uplink transmission in wireless communication systems

1. A method comprising:

receiving, by a wireless device, configuration parameters indicating that a default beam is used for uplink transmissions via physical uplink shared channel (PUSCH) resources;

receiving a downlink control information (DCI) indicating a first uplink transmission via a first PUSCH resource of the PUSCH resources;

in response to the configuration parameters indicating that the default beam is used, determining, for the first uplink transmission, a spatial relation information of the default beam based on a downlink reference signal; and

transmitting a transport block via the first PUSCH resource and according to the spatial relation information.

2. The method of claim 1 , wherein the configuration parameters comprise parameters of downlink reference signals, and wherein the downlink reference signal is one of the downlink reference signals.

3. The method of claim 2 , wherein the downlink reference signals comprise at least one of:

one or more channel state information reference signals (CSI-RSs);

one or more synchronization signal blocks (SSBs); and

one or more sounding reference signals (SRSs).

4. The method of claim 1 , wherein the determining the spatial relation information is further in response to the DCI being of DCI format 0_0.

5. The method of claim 1 , wherein the determining the spatial relation information is further in response to:

the DCI being of DCI format 0_0 or a sounding-reference-signal resource indicator (SRI) field being absent from the DCI; and

the wireless device being in a radio resource control connected state.

6. The method of claim 5 , wherein the determining the spatial relation information is further in response to one or more spatial relation information, for physical uplink control channel (PUCCH) resources, not being configured.

7. The method of claim 1 , wherein the transmitting the transport block according to the spatial relation information comprises:

transmitting the transport block, based on a spatial domain filter used for receiving a synchronization signal block (SSB) of the downlink reference signal, in response to the spatial relation information being associated with the SSB.

8. The method of claim 7 , wherein the configuration parameters further indicate the spatial relation information is associated with the SSB of the downlink reference signal.

9. The method of claim 1 , wherein the DCI does not comprise a sounding-reference-signal resource indicator (SRI) field for the first uplink transmission.

10. The method of claim 9 , wherein the determining the spatial relation information is further in response to the SRI field being absent from the DCI.

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 configuration parameters indicating that a default beam is used for uplink transmissions via physical uplink shared channel (PUSCH) resources;

receive a downlink control information (DCI) indicating a first uplink transmission via a first PUSCH resource of the PUSCH resources;

in response to the configuration parameters indicating that the default beam is used, determine, for the first uplink transmission, a spatial relation information of the default beam based on a downlink reference signal; and

transmit a transport block via the first PUSCH resource and according to the spatial relation information.

12. The wireless device of claim 11 , wherein the configuration parameters comprise parameters of downlink reference signals, and wherein the downlink reference signal is one of the downlink reference signals.

13. The wireless device of claim 12 , wherein the downlink reference signals comprise at least one of:

one or more channel state information reference signals (CSI-RSs);

one or more synchronization signal blocks (SSBs); and

one or more sounding reference signals (SRSs).

14. The wireless device of claim 11 , wherein the determination of the spatial relation information is further in response to the DCI being of DCI format 0_0.

15. The wireless device of claim 11 , wherein the determination of the spatial relation information is further in response to:

a sounding-reference-signal resource indicator (SRI) field being absent from the DCI or the DCI being of DCI format 0_0; and

the wireless device being in a radio resource control connected state.

16. The wireless device of claim 15 , wherein the determination of the spatial relation information is further in response to one or more spatial relation information, for physical uplink control channel (PUCCH) resources, not being configured.

17. The wireless device of claim 11 , wherein to transmit the transport block according to the spatial relation information, the instructions further cause the wireless device to:

transmit the transport block, based on a spatial domain filter used for receiving a synchronization signal block (SSB) of the downlink reference signal, in response to the spatial relation information being associated with the SSB.

18. The wireless device of claim 17 , wherein the configuration parameters further indicate the spatial relation information is associated with the SSB of the downlink reference signal.

19. The wireless device of claim 11 , wherein the DCI does not comprise a sounding-reference-signal resource indicator (SRI) field for the first uplink transmission, and wherein the determination of the spatial relation information is further in response to the SRI field being absent from the DCI.

20. A system comprising:

a base station comprising:

one or more first processors; and

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

transmit configuration parameters indicating that a default beam is used for uplink transmissions via physical uplink shared channel (PUSCH) resources; and

transmit a downlink control information (DCI) indicating a first uplink transmission via a first PUSCH resource of the PUSCH resources; and

a wireless device comprising:

one or more second processors; and

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

receive, from the base station, the configuration parameters;

receive the DCI indicating the first uplink transmission via the first PUSCH resource;

in response to the configuration parameters indicating that the default beam is used, determine, for the first uplink transmission, a spatial relation information of the default beam based on a downlink reference signal; and

transmit a transport block via the first PUSCH resource and according to the spatial relation information.