Beam switch related information feedback in wireless communications
Methods, systems, and devices for wireless communications are described in which measurements of a number of beams that are transmitted from a first device, measured at a second device are provided in a beam switch metric report from the second device. The beam switch metric report may provide the first device with information that is otherwise unavailable to the first device and that may be used for setting beam management parameters.
1. An apparatus for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the memory and the one or more processors being configured to:
identify a plurality of receive beams associated with a second device, each of the plurality of receive beams of the second device having a different transmission configuration indicator state and a different direction relative to the second device;
determine, based at least in part on the plurality of receive beams of the second device, one or more beam switch metrics for determining a beam switch periodicity for switching the second device between two or more of the plurality of receive beams; and
transmit a report to a first device or a third device that indicates the one or more beam switch metrics.
2. The apparatus of claim 1 , wherein the first device and the third device are each base stations, and the second device is a user equipment (UE).
3. The apparatus of claim 1 , wherein the one or more beam switch metrics provide information for setting beam management transmissions in accordance with the beam switch periodicity for switching the second device between the two or more of the plurality of receive beams of the second device.
4. The apparatus of claim 1 , wherein the one or more beam switch metrics comprise one or more of:
a speed of the second device;
a Doppler shift of one or more transmission beams observed at the second device;
a distance between the second device and the first device;
a dwelling time that indicates an expected time duration during which a transmission beam of the first device will have more favorable channel conditions than any other of a plurality of transmission beams of the first device;
a dwelling time that indicates an expected time duration during which a receive beam of the second device will provide more favorable receive conditions than any other of the plurality of receive beams of the second device;
a second device movement profile that comprises information related to the second device movement speed and direction, spatial location changes, or combinations thereof;
a calculated beam switch periodicity; or
any combinations thereof.
5. The apparatus of claim 4 , wherein the beam switch metrics comprise statistics that indicate one or more of:
an average value of the associated beam switch metric;
a median value of the associated beam switch metric;
a percentile of the associated beam switch metric;
a maximum value of the associated beam switch metric during a predetermined time period;
a minimum value of the associated beam switch metric during the predetermined time period;
a histogram of observed beam switch metrics for the predetermined time period;
or any combinations thereof.
6. A method for wireless communication at a second device comprising:
identifying a plurality of receive beams associated with the second device, each of the plurality of receive beams of the second device having a different transmission configuration indicator state and a different direction relative to the second device;
determining, based at least in part on the plurality of receive beams of the second device, one or more beam switch metrics for determining a beam switch periodicity for switching the second device between two or more of the plurality of receive beams; and
transmitting a report to a first device or a third device that indicates the one or more beam switch metrics.
7. The method of claim 6 , wherein the first device and the third device are each base stations, and the second device is a user equipment (UE).
8. The method of claim 6 , wherein the one or more beam switch metrics provide information for setting beam management transmissions in accordance with the beam switch periodicity for switching the second device between the two or more of the plurality of receive beams of the second device.
9. The method of claim 6 , wherein the one or more beam switch metrics comprise one or more of:
a speed of the second device;
a Doppler shift of one or more transmission beams observed at the second device;
a distance between the second device and the first device;
a dwelling time that indicates an expected time duration during which a transmission beam of the first device will have more favorable channel conditions than any other of a plurality of transmission beams of the first device;
a dwelling time that indicates an expected time duration during which a receive beam of the second device will provide more favorable receive conditions than any other of the plurality of receive beams of the second device;
a second device movement profile that comprises information related to the second device movement speed and direction, spatial location changes, or combinations thereof;
a calculated beam switch periodicity; or
any combinations thereof.
10. The method of claim 9 , wherein the beam switch metrics comprise statistics that indicate one or more of:
an average value of the associated beam switch metric;
a median value of the associated beam switch metric;
a percentile of the associated beam switch metric;
a maximum value of the associated beam switch metric during a predetermined time period;
a minimum value of the associated beam switch metric during the predetermined time period;
a histogram of observed beam switch metrics for the predetermined time period;
or any combinations thereof.