Granted Patent B2

US 12,356,449 · App. 17/760,234 · Granted Jul 8, 2025

Inventors: Joachim Loehr (Wiesbaden, DE); Alexander Johann Maria Golitschek Edler von Elbwart (Darmstadt, DE); Ankit Bhamri (Rödermark, DE); Ali Ramadan Ali (Kraiburg am Inn, DE); Karthikeyan Ganesan (Kronberg im Taunus, DE); Prateek Basu Mallick (Dreieich, DE)

Assignee: Lenovo (Singapore) Pte. Ltd.

H04W74/0808

Abstract

Claims (37)

1. A method performed by a user equipment device (“UE”), the method comprising:

performing a listen-before-talk (“LBT”) procedure for a configured set of transmit (“Tx”) beams corresponding to an uplink transmission, the set of Tx beams comprising at least one group of beams having a same quasi-co-location (“QCL”) relationship;

determining an LBT failure for the uplink transmission in response to determining that the LBT procedure has failed for all Tx beams in the configured set;

incrementing a first LBT failure counter in response to LBT failure for the uplink transmission;

tracking a second LBT failure counter for each group of beams in the set of Tx beams; and

incrementing the second LBT failure counter in response to all Tx beams in a respective group of beams experiencing LBT failure.

2. The method of claim 1 , wherein performing the LBT procedure for the configured set of Tx beams comprises concurrently performing multiple LBT procedures.

3. The method of claim 1 , wherein performing the LBT procedure for the configured set of Tx beams comprises sequentially performing multiple LBT procedures.

4. The method of claim 1 , further comprising tracking a per-beam LBT failure for each Tx beams in the configured set.

5. The method of claim 4 , further comprising performing autonomous deactivation of a first Tx beam of the configured set in response to a first per-beam LBT failure counter associated with the first Tx beam exceeding a threshold value.

6. The method of claim 5 , further comprising

activating a second Tx beam in response to deactivating the first Tx beam; and

performing a random-access procedure using the second Tx beam.

7. The method of claim 5 , wherein the uplink transmission corresponds to a configured grant.

8. The method of claim 4 , further comprising reporting LBT failure statistics to a radio access network (“RAN”) node, the LBT failure statistics comprising per-beam LBT failures for the configured set of Tx beams, or per-group LBT failures for the configured set of Tx beams, or both.

9. The method of claim 1 , wherein the LBT procedure is performed using a first receive (“RX”) beam corresponding to a first Tx beam of the configured set, the method further comprising using a second Rx beam for downlink reception, wherein the first Rx beam is different than the second Rx beam.

10. The method of claim 9 , wherein the first Rx beam is selected based on a Sounding Reference Signal Resource Indicator (“SRI”) included in an uplink grant for the uplink transmission.

11. The method of claim 1 , wherein declaring LBT failure for the uplink transmission comprises a physical layer entity of the UE sending a LBT failure indication to a MAC entity of the UE, wherein the MAC entity increments the first LBT failure counter or the second LBT failure counter.

12. A user equipment (“UE”) for wireless communication, comprising:

a memory; and

a processor coupled with the memory and configured to cause the UE to:

perform a listen-before-talk (“LBT”) procedure for a configured set of transmit (“Tx”) panels corresponding to an uplink transmission, wherein the set of Tx panels comprises a plurality of panels associated with one or more beams and comprises at least one group of panels having a same quasi-co-location (“QCL”) relationship;

determine an LBT failure for the uplink transmission in response to determining that the LBT procedure has failed for all Tx panels in the configured set;

increment a first LBT failure counter in response to LBT failure for the uplink transmission;

track a second LBT failure counter for each group of panels in the set of Tx panels; and

increment the second LBT failure counter in response to all Tx panels in a respective group of panels experiencing LBT failure.

13. The UE of claim 12 , wherein the processor is configured to cause the UE to track a per-panel LBT failure for each Tx panels in the configured set.

14. The UE of claim 13 , wherein the processor is configured to cause the UE to perform autonomous deactivation of a first Tx panel of the configured set in response to a first per-panel LBT failure counter associated with the first Tx panel exceeding a threshold value.

15. The UE of claim 14 , wherein the processor is configured to cause the UE to:

activate a second UE-Tx panel in response to deactivating the first Tx panel; and

perform a random-access procedure using the second Tx panel.

16. The UE of claim 13 , wherein the processor is configured to cause the UE to report LBT failure statistics to a radio access network (“RAN”) node, the LBT failure statistics comprising per-panel LBT failures for the configured set of Tx panels, or per-group LBT failures for the configured set of Tx panels, or both.

17. The UE of claim 12 , wherein the processor is configured to cause the UE to:

perform the LBT procedure using a first UE receive (“RX”) panel corresponding to a first Tx panel of the configured set, and

use a second UE Rx panel for downlink reception, wherein the first UE Rx panel is different than the second UE Rx panel.

18. The UE of claim 17 , wherein the first UE Rx panel is selected based on a Sounding Reference Signal Resource Indicator (“SRI”) included in an uplink grant for the uplink transmission.

19. The UE of claim 12 , wherein to declare LBT failure for the uplink transmission, a physical layer entity of the UE sends a LBT failure indication to a MAC entity of the UE, wherein the MAC entity increments the first LBT failure counter or the second LBT failure counter.

Assignments (1)

Continuity (2)

References Cited (31)