Joint communication and sensing aided beam management for NR
Methods and apparatuses for receive (Rx) beam selection are described herein. A wireless transmit/receive unit (WTRU) may be configured to receive, from a base station (BS), configuration information for joint communication and sensing (JCS) reference signals. The configuration information may include resources for reference signal transmission and resources for measurement reporting. The WTRU may be further configured to receive, from the BS, an indication to activate a subset of the resources for JCS reference signal transmission. The WTRU may be further configured to transmit, a plurality of JCS reference signals using the activated subset of resources for reference signal transmission. The WTRU may be further configured to measure, via a plurality of Rx beams, a backscatter power associated with each of the transmitted plurality of JCS reference signals. The WTRU may be further configured to calculate beam blockage statistics based on the measured backscatter power.
1. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving configuration information indicating resources for receiving a first set of reference signals from one or more transmit/receive points (TRPs) using a first set of receive (Rx) beams, one or more first resource sets for transmitting a second set of reference signals, and one or more second resource sets for reporting sensing information for the second set of reference signals;
transmitting, in a plurality of spatial directions, the second set of reference signals using one of the one or more first resource sets;
measuring a backscatter power of at least a portion of the transmitted second set of reference signals;
reporting sensing information, based on the measured backscatter power of the at least the portion of the transmitted second set of reference signals, using one of the one or more second resource sets, the sensing information including information indicating one or more blockage statistics associated with at least a portion of the plurality of spatial directions; and
receiving the first set of reference signals from the one or more TRPs using a second set of Rx beams, wherein the second set of Rx beams is determined based on the reported sensing information.
2. The method of claim 1 , further comprising determining, based on the sensing information, another one of the one or more first resource sets for transmitting a second set of reference signals; and
another one of the second one or more resource sets for reporting sensing information for the second set of reference signals.
3. The method of claim 2 , wherein the another one of the one or more first resource sets for transmitting the second set of reference signals is determined based on a comparison between the measured backscatter power of each of the at least the portion of the second set of reference signals and a threshold value.
4. The method of claim 2 , wherein the one or more blockage statistics include a blockage rate associated with the at least the portion of the plurality of spatial directions.
5. The method of claim 4 , wherein the another one of the one or more first resource sets for transmitting the second set of reference signals is determined based on a comparison between the blockage rate and a threshold value.
6. The method of claim 5 , wherein the sensing information is reported when the blockage rate exceeds the threshold value.
7. The method of claim 4 , wherein the second set of Rx beams is a subset of the first set of Rx beams.
8. The method of claim 2 , wherein the one of the first one or more resource sets used to transmit the second set of reference signals is associated with a first transmission periodicity, wherein the another one of the first one or more resource sets for transmitting a second set of reference signals is associated with a second transmission periodicity, and wherein the first transmission periodicity and the second transmission periodicity are different.
9. The method of claim 2 , wherein the one of the second one or more resource sets used to report sensing information is associated with a first reporting periodicity, wherein the another one of the second one or more resource sets for reporting sensing information is associated with a second reporting periodicity, and wherein the first reporting periodicity and the second reporting periodicity are different.
10. The method of claim 1 , wherein the received configuration information includes information indicating a timing offset between a reception of a message, by the WTRU, and a next transmission of one of the second set of reference signals.
11. A wireless transmit/receive unit (WTRU) comprising:
a processor; and
a transceiver;
the transceiver configured to receive configuration information indicating resources for receiving a first set of reference signals from one or more transmit/receive points (TRPs) using a first set of receive (Rx) beams, one or more first resource sets for transmitting a second set of reference signals, and one or more second resource sets for reporting sensing information for the second set of reference signals;
the transceiver further configured to transmit, in a plurality of spatial directions, the second set of reference signals using one of the one or more first resource sets;
the processor and the transceiver configured to measure a backscatter power of at least a portion of the transmitted second set of reference signals;
the processor and the transceiver further configured to report sensing information, based on the measured backscatter power of the at least the portion of the transmitted second set of reference signals, using one of the one or more second resource sets, the sensing information including information indicating one or more blockage statistics associated with at least a portion of the plurality of spatial directions; and
the transceiver further configured to receive the first set of reference signals from the one or more TRPs using a second set of Rx beams, wherein the second set of Rx beams is determined based on the reported sensing information.
12. The WTRU of claim 11 , the processor further configured to determine, based on the sensing information,
another one of the first one or more resource sets for transmitting a second set of reference signals; and
another one of the second one or more resource sets for reporting sensing information for the second set of reference signals.
13. The WTRU of claim 12 , wherein the another one of the first one or more resource sets for transmitting the second set of reference signals is determined based on a comparison between the measured backscatter power of each of the at least the portion of the second set of reference signals and a threshold value.
14. The WTRU of claim 12 , wherein the one or more blockage statistics include a blockage rate associated with the at least the portion of the plurality of spatial directions.
15. The WTRU of claim 14 , wherein the another one of the first one or more resource sets for transmitting the second set of reference signals is determined based on a comparison between the blockage rate and a threshold value.
16. The WTRU of claim 15 , wherein the sensing information is reported when the blockage rate exceeds the threshold value.
17. The WTRU of claim 14 , wherein the second set of Rx beams is a subset of the first set of Rx beams.
18. The WTRU of claim 12 , wherein the one of the first one or more resource sets used to transmit the second set of reference signals is associated with a first transmission periodicity, wherein the another one of the first one or more resource sets for transmitting a second set of reference signals is associated with a second transmission periodicity, and wherein the first transmission periodicity and the second transmission periodicity are different.
19. The WTRU of claim 12 , wherein the one of the second one or more resource sets used to report sensing information is associated with a first reporting periodicity, wherein the another one of the second one or more resource sets for reporting sensing information is associated with a second reporting periodicity, and wherein the first reporting periodicity and the second reporting periodicity are different.
20. The WTRU of claim 11 , wherein the received configuration information includes information indicating a timing offset between a reception of a message, by the WTRU, and a next transmission of one of the second set of reference signals.