Enhanced uplink beam management
Systems, apparatuses, methods, and computer-readable media are provided for uplink beam management and power control in wireless communications systems. Disclosed embodiments include beam management and power control enhancements for Physical Uplink Shared Channel (PUSCH), Sounding Reference Signal (SRS), and Physical Uplink Control Channel (PUSCH) transmissions. Other embodiments may be described and/or claimed.
1. A user equipment (UE) comprising:
interface circuitry; and
baseband circuitry coupled with the interface circuitry, the baseband circuitry to:
generate a sounding reference signal (SRS) beam for transmission in a configured SRS resource indicated by received Downlink Control Information (DCI) responsive to the UE being configured with SRS resources for a configured transmission scheme via higher layer signaling and a subset of the SRS resources are reconfigured via a received Media Access Control (MAC) Control Element (CE), wherein the configured SRS resource is selected from the subset of the SRS resources based on the received DCI: and
provide, via the interface circuitry, the SRS beam to radiofrequency (RF) circuitry for transmission.
2. The UE of claim 1 , wherein the MAC CE is to indicate a component carrier (CC) index and a bandwidth part identifier (ID).
3. The UE of claim 2 , wherein the SRS resources are configured with a periodic time domain behavior or an aperiodic time domain behavior, and wherein the MAC CE is to update a beam of each SRS resource of the subset of the SRS resources, and the MAC CE is to further indicate an SRS resource ID for each SRS resource and spatial relation information for each SRS resource.
4. The UE of claim 2 , wherein the UE is configured with one or more SRS resource sets via the higher layer signaling, and the one or more SRS resource sets comprise the SRS resources.
5. The UE of claim 4 , wherein the SRS resources are configured with a periodic time domain behavior or an aperiodic time domain behavior, and wherein the MAC CE is to update beams of all SRS resources in an individual SRS resource set of the one or more SRS resource sets, and the MAC CE is to further indicate an SRS resource set ID for the individual SRS resource set and spatial relation information for each SRS resource in the individual SRS resource set.
6. The UE of claim 4 , wherein the MAC CE is to update a power control parameter set for an individual SRS resource set of the one or more SRS resource sets, and the MAC CE is to further indicate an SRS resource set ID for the individual SRS resource set, a P0 and alpha set ID, a pathloss reference signal ID, and a closed-loop index.
7. The UE of claim 1 , wherein the baseband circuitry is further to:
generate a physical uplink shared channel (PUSCH) beam for transmission in the configured SRS resource indicated by the received DCI when the MAC CE indicates M number of candidate SRS resources, and
provide, via the interface circuitry, the PUSCH beam to the RF circuitry for transmission.
8. The UE of claim 7 , wherein the MAC CE is to include a CC index, a BWP ID, and an SRS resource ID for each of the M number of candidate SRS resources.
9. The UE of claim 7 , wherein the MAC CE is to include a CC index, a BWP ID, and spatial relation information for a corresponding SRS resource indicator (SRI) of the M number of candidate SRS resources.
10. The UE of claim 7 , wherein the received DCI includes an SRS resource indicator field, and a value in the SRS resource indicator field is selected from the M number of candidate SRS resources.
11. The UE of claim 1 , wherein the configured transmission scheme is a codebook based transmission scheme or a non-codebook based transmission scheme.
12. A method of operating a user equipment (UE), comprising:
generating a sounding reference signal (SRS) beam for transmission in a configured SRS resource indicated by received Downlink Control Information (DCI) responsive to the UE being configured with SRS resources for a configured transmission scheme via higher layer signaling and a subset of the SRS resources are reconfigured via a Media Access Control (MAC) Control Element (CE) received from a base station, wherein the configured SRS resource is selected from the subset of the SRS resources based on the received DCI; and
transmitting the SRS beam to the base station.
13. The method of claim 12 , wherein the MAC CE is to indicate a component carrier (CC) index and a bandwidth part identifier (ID).
14. The method of claim 13 , wherein the SRS resources are configured with a periodic time domain behavior or an aperiodic time domain behavior, and wherein the MAC CE is to update a beam of each SRS resource of the subset of the SRS resources, and the MAC CE is to further indicate an SRS resource ID for each SRS resource and spatial relation information for each SRS resource.
15. The method of claim 13 , wherein the UE is configured with one or more SRS resource sets via the higher layer signaling, and the one or more SRS resource sets comprise the SRS resources.
16. The method of claim 15 , wherein the SRS resources are configured with a periodic time domain behavior or an aperiodic time domain behavior, and wherein the MAC CE is to update beams of all SRS resources in an individual SRS resource set of the one or more SRS resource sets, and the MAC CE is to further indicate an SRS resource set ID for the individual SRS resource set and spatial relation information for each SRS resource in the individual SRS resource set.
17. The method of claim 15 , wherein the MAC CE is to update a power control parameter set for an individual SRS resource set of the one or more SRS resource sets, and the MAC CE is to further indicate an SRS resource set ID for the individual SRS resource set, a P0 and alpha set ID, a pathloss reference signal ID, and a closed-loop index.
18. The method of claim 12 , further comprising:
generating a physical uplink shared channel (PUSCH) beam for transmission in the configured SRS resource indicated by the received DCI when the MAC CE indicates M number of candidate SRS resources, and
transmitting the PUSCH beam to the base station.
19. The method of claim 18 , wherein the MAC CE is to include a CC index, a BWP ID, and an SRS resource ID for each of the M number of candidate SRS resources.
20. The method of claim 18 , wherein the MAC CE is to include a CC index, a BWP ID, and spatial relation information for a corresponding SRS resource indicator (SRI) of the M number of candidate SRS resources.
21. The method of claim 18 , wherein the received DCI includes an SRS resource indicator field, and a value in the SRS resource indicator field is selected from the M number of candidate SRS resources.
22. The method of claim 12 , wherein the configured transmission scheme is a codebook based transmission scheme or a non-codebook based transmission scheme.