Downlink signal reception with antenna panel switching
Apparatuses, systems, and methods for performing downlink signal reception with antenna panel switching in a wireless communication system. A cellular base station may receive an indication of an antenna panel activation delay from a wireless device. The cellular base station may select a scheduling offset for a transmission to the wireless device based at least in part on the antenna panel activation delay. The scheduling offset may be selected to be at least the length of the antenna panel activation delay if it is expected that the wireless device may perform antenna panel activation to receive the transmission. The cellular base station may schedule the transmission to the wireless device using the selected scheduling offset, and may perform the transmission to the wireless device at the selected scheduling offset after scheduling the transmission to the wireless device.
1. A user equipment (UE) device, comprising:
at least one antenna;
at least one radio coupled to the at least one antenna; and
a processor coupled to the at least one radio;
wherein the at least one antenna, the at least one radio, and the processor are configured to cause the UE device to:
report an indication for a beam switching delay, wherein the indication comprises a value;
provide an indication of a number of beam groups and a number of beams per beam group supported by the UE device;
receive a physical downlink control channel (PDCCH) triggering measurement of an aperiodic channel state information reference signal (A-CSI-RS) transmission at a scheduling offset;
when the scheduling offset is at least the value and the A-CSI-RS transmission is configured for repetition, apply a transmission configuration indicator (TCI) state configured for the A-CSI-RS transmission, and otherwise apply a default TCI state based on the TCI state for a control resource set (CORESET) with a lowest CORESET identifier (ID) in a latest one or more slots; and
receive the A-CSI-RS transmission based on the scheduling offset and the applied TCI state,
wherein, based on a number of scheduled channel state information reference signal (CSI-RS) resources of the A-CSI-RS transmission being greater than the number of beams per beam group supported by the UE device, the scheduling offset is selected to be at least the beam switching delay for the UE device to have time to perform antenna panel activation.
2. The UE device of claim 1 ,
wherein the value is one of 224 or 336 symbols.
3. The UE device of claim 1 ,
wherein the scheduling offset is selected based at least in part on whether multiple beam groups are supported by the UE device.
4. The UE device of claim 1 , wherein the UE device is further configured to, at a later time:
report an indication of an updated beam switching delay of the UE device.
5. The UE device of claim 1 ,
wherein the UE device is configured to communicate using a 5 th Generation (5G) New Radio (NR) radio access technology (RAT).
6. The UE device of claim 1 ,
wherein the PDCCH is received from a g node B (gNB).
7. An apparatus, comprising:
a processor configured to cause a user equipment (UE) device to:
report an indication for a beam switching delay, wherein the indication comprises a value;
provide an indication of a number of beam groups and a number of beams per beam group supported by the UE device;
receive a physical downlink control channel (PDCCH) triggering measurement of an aperiodic channel state information reference signal (A-CSI-RS) transmission at a scheduling offset;
when the scheduling offset is at least the value and the A-CSI-RS transmission is configured for repetition, apply a transmission configuration indicator (TCI) state configured for the A-CSI-RS transmission, and otherwise apply a default TCI state based on the TCI state for a control resource set (CORESET) with a lowest CORESET identifier (ID) in a latest one or more slots; and
receive the A-CSI-RS transmission based on the scheduling offset and the applied TCI state,
wherein, based on a number of scheduled channel state information reference signal (CSI-RS) resources of the A-CSI-RS transmission being greater than the number of beams per beam group supported by the UE device, the scheduling offset is selected to be at least the beam switching delay for the UE device to have time to perform antenna panel activation.
8. The apparatus of claim 7 ,
wherein the value is one of 224 or 336 symbols.
9. The apparatus of claim 7 ,
wherein the scheduling offset is selected based at least in part on whether multiple beam groups are supported by the UE device.
10. The apparatus of claim 7 , wherein the apparatus is further configured to cause the UE device to, at a later time:
report an indication of an updated beam switching delay of the UE device.
11. The apparatus of claim 7 ,
wherein the UE device is configured to communicate using a 5 th Generation (5G) New Radio (NR) radio access technology (RAT).
12. The apparatus of claim 7 ,
wherein the PDCCH is received from a g node B (gNB).
13. A method, comprising:
by a user equipment (UE) device:
reporting an indication for a beam switching delay, wherein the indication comprises a value;
providing an indication of a number of beam groups and a number of beams per beam group supported by the UE device;
receiving a physical downlink control channel (PDCCH) triggering measurement of an aperiodic channel state information reference signal (A-CSI-RS) transmission at a scheduling offset;
when the scheduling offset is at least the value and the A-CSI-RS transmission is configured for repetition, applying a transmission configuration indicator (TCI) state configured for the A-CSI-RS transmission, and otherwise applying a default TCI state based on the TCI state for a control resource set (CORESET) with a lowest CORESET identifier (ID) in a latest one or more slots; and
receiving the A-CSI-RS transmission based on the scheduling offset and the applied TCI state,
wherein, based on a number of scheduled channel state information reference signal (CSI-RS) resources of the A-CSI-RS transmission being greater than the number of beams per beam group supported by the UE device, the scheduling offset is selected to be at least the beam switching delay for the UE device to have time to perform antenna panel activation.
14. The method of claim 13 ,
wherein the value is one of 224 or 336 symbols.
15. The method of claim 13 ,
wherein the scheduling offset is selected based at least in part on whether multiple beam groups are supported by the UE device.
16. The method of claim 13 , further comprising:
at a later time, report an indication of an updated beam switching delay of the UE device.
17. The method of claim 13 ,
wherein the UE device is configured to communicate using a 5 th Generation (5G) New Radio (NR) radio access technology (RAT).
18. The method of claim 13 ,
wherein the PDCCH is received from a g node B (gNB).