US-12621721-B2 - Sidelink feedback management during a same channel co-existence

Abstract

Certain aspects of the present disclosure provide a method for wireless communications at a first user equipment (UE). The first UE may detect at least one condition related to first resources reserved for sidelink transmissions in a first radio access technology (RAT). The first UE may perform one or more actions, based on the detection, to limit feedback request for sidelink transmissions in a second RAT.

Inventors

• Tien Viet Nguyen
• Sourjya DUTTA
• Gabi SARKIS

Assignees

• QUALCOMM INCORPORATED

Dates

Publication Date

20260505

Application Date

20230510

Claims (20)

1. 1 . An apparatus for wireless communications at a first user equipment (UE), comprising: one or more memories comprising instructions; and one or more processors, individually or collectively, configured to execute the instructions to cause the apparatus to: detect at least one condition related to first resources reserved for sidelink transmissions in a first radio access technology (RAT); and perform one or more actions, based on the detection, to limit feedback request for sidelink transmissions in a second RAT, wherein at least one of the one or more actions indicates disabling a request for a feedback for at least one of the sidelink transmissions in the second RAT.
2. 2 . The apparatus of claim 1 , wherein the first resources comprise resources overlapping with a physical sidelink feedback channel (PSFCH) slot.
3. 3 . The apparatus of claim 1 , wherein: the first RAT corresponds to a long term evolution (LTE) RAT; and the second RAT corresponds to a new radio (NR) RAT.
4. 4 . The apparatus of claim 1 , wherein the at least one condition relates to at least one of: an amount of resources from a candidate set of resources within a resource selection window that are excluded, for the sidelink transmissions in the second RAT, due to reservation of the first resources, wherein the reservation overlaps with a physical sidelink feedback channel (PSFCH) slot associated with a resource; or detection of one or more reservations of the first resources for the sidelink transmissions in the first RAT.
5. 5 . The apparatus of claim 4 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the apparatus to calculate the amount of resources excluded from the candidate set of resources.
6. 6 . The apparatus of claim 5 , wherein the amount of resources are calculated based on counting at least one of: a number of PSFCH slots comprising at least one of the first resources reserved for the sidelink transmissions in the first RAT; a number of resources from the candidate set of resources that can not be selected by the first UE due to the reservation of the first resources, wherein the reservation overlaps with the PSFCH slot associated with the resource; or a subset of resources in the candidate set of resources from which a higher layer selects resources for one or more transmissions.
7. 7 . The apparatus of claim 4 , wherein the one or more actions comprise: the one or more processors, individually or collectively, configured to execute the instructions to cause the apparatus to disable the feedback request for at least one sidelink transmission in the second RAT when the amount of resources excluded from the candidate set of resources or a number of the one or more reservations of the first resources for the sidelink transmissions in the first RAT exceeds a threshold value.
8. 8 . The apparatus of claim 7 , wherein the disable comprises at least one of: change a cast type associated with the at least one sidelink transmission; or adjust a status of a flag associated with the at least one sidelink transmission.
9. 9 . The apparatus of claim 7 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the apparatus to receive signaling indicating the threshold value.
10. 10 . The apparatus of claim 9 , wherein the threshold value is one of a plurality of different threshold values corresponding to different priorities.
11. 11 . The apparatus of claim 1 , wherein the one or more actions comprise: the one or more processors, individually or collectively, configured to execute the instructions to cause the apparatus to decide whether to disable the feedback request for at least sidelink transmission in the second RAT when the at least one condition is met, based on a priority associated with the at least sidelink transmission.
12. 12 . The apparatus of claim 11 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the apparatus to disable the feedback request, based on the priority.
13. 13 . The apparatus of claim 1 , wherein: the at least one condition indicates that the first resources are for a second UE, based on a current reservation status of a candidate set of resources; and the one or more actions comprise the one or more processors, individually or collectively, configured to execute the instructions to cause the apparatus to transmit a first signaling to the second UE, in response to the detection of the at least one condition.
14. 14 . The apparatus of claim 13 , wherein the first signaling comprises at least one of: an indication to disable the feedback request for at least one sidelink transmission in the second RAT; or an indication to transmit at least one feedback for the at least one sidelink transmission in the second RAT.
15. 15 . The apparatus of claim 13 , wherein: the one or more processors, individually or collectively, are configured to execute the instructions to cause the apparatus to detect a change in the current reservation status of the candidate set of resources; the one or more actions comprise the one or more processors, individually or collectively, configured to execute the instructions to cause the apparatus to transmit a second signaling to the second UE, in response to the detection of the change in the current reservation status of the candidate set of resources; and the second signaling comprises an indication to enable the feedback request for at least one sidelink transmission in the second RAT.
16. 16 . The apparatus of claim 1 , wherein: the at least one condition relates to an indication from a second UE that the first resources are reserved for the sidelink transmissions in the first RAT; and the one or more actions comprise the one or more processors, individually or collectively, configured to execute the instructions to cause the apparatus to disable the feedback request for at least one sidelink transmission in the second RAT in accordance with the indication.
17. 17 . The apparatus of claim 16 , wherein the indication is based on a value of a number of the first resources within a period.
18. 18 . The apparatus of claim 16 , wherein the indication is based on a value of a reference signal receive power (RSRP) associated with a number of the first resources within a period.
19. 19 . A method for wireless communications at a first user equipment (UE), comprising: detecting at least one condition related to first resources reserved for sidelink transmissions in a first radio access technology (RAT); and performing one or more actions, based on the detection, to limit feedback request for sidelink transmissions in a second RAT, wherein at least one of the one or more actions indicates disabling a request for a feedback for at least one of the sidelink transmissions in the second RAT.
20. 20 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a first user equipment (UE), cause the first UE to perform a method of wireless communications, comprising: detecting at least one condition related to first resources reserved for sidelink transmissions in a first radio access technology (RAT); and performing one or more actions, based on the detection, to limit feedback request for sidelink transmissions in a second RAT, wherein at least one of the one or more actions indicates disabling a request for a feedback for at least one of the sidelink transmissions in the second RAT.

Description

BACKGROUND Field of the Disclosure Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for managing sidelink feedback-based transmissions in a multiple radio access technology (RAT) scenario with a same channel co-existence. Description of Related Art Wireless communications systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, or other similar types of services. These wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available wireless communications system resources with those users. Although wireless communications systems have made great technological advancements over many years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Accordingly, there is a continuous desire to improve the technical performance of wireless communications systems, including, for example: improving speed and data carrying capacity of communications, improving efficiency of the use of shared communications mediums, reducing power used by transmitters and receivers while performing communications, improving reliability of wireless communications, avoiding redundant transmissions and/or receptions and related processing, improving the coverage area of wireless communications, increasing the number and types of devices that can access wireless communications systems, increasing the ability for different types of devices to intercommunicate, increasing the number and type of wireless communications mediums available for use, and the like. Consequently, there exists a need for further improvements in wireless communications systems to overcome the aforementioned technical challenges and others. SUMMARY One aspect provides a method for wireless communications by a first user equipment (UE). The method includes detecting at least one condition related to first resources reserved for sidelink transmissions in a first radio access technology (RAT); and performing one or more actions, based on the detection, to limit feedback request for sidelink transmissions in a second RAT. Other aspects provide: an apparatus operable, configured, or otherwise adapted to perform the aforementioned methods as well as those described elsewhere herein; a non-transitory, computer-readable media comprising instructions that, when executed by a processor of an apparatus, cause the apparatus to perform the aforementioned methods as well as those described elsewhere herein; a computer program product embodied on a computer-readable storage medium comprising code for performing the aforementioned methods as well as those described elsewhere herein; and an apparatus comprising means for performing the aforementioned methods as well as those described elsewhere herein. By way of example, an apparatus may comprise a processing system, a device with a processing system, or processing systems cooperating over one or more networks. The following description and the appended figures set forth certain features for purposes of illustration. BRIEF DESCRIPTION OF DRAWINGS The appended figures depict certain features of the various aspects described herein and are not to be considered limiting of the scope of this disclosure. FIG. 1 depicts an example wireless communications network. FIG. 2 depicts an example disaggregated base station (BS) architecture. FIG. 3 depicts aspects of an example BS and an example user equipment (UE). FIGS. 4A, 4B, 4C, and 4D depict various example aspects of data structures for a wireless communications network. FIGS. 5 and 6 depict diagrammatic representations of example vehicle-to-everything (V2X) systems. FIG. 7 depicts example sidelink feedback resources. FIGS. 8A-8B depict examples of physical sidelink feedback shared channel (PSFCH) resource mapping. FIG. 9 depicts example long term evolution (LTE) V2X-new radio (NR) V2X system. FIG. 10 depicts another example LTE V2X-NR V2X system. FIG. 11 depicts example NR V2X system and example LTE V2X-NR V2X system. FIG. 12 depicts example NR V2X system. FIG. 13 depicts example LTE V2X frame structure. FIG. 14 depicts example NR V2X frame structure. FIG. 15 depicts a call flow diagram illustrating example communication among multiple UEs. FIG. 16 depicts a method for wireless communications at a first UE. FIG. 17 depicts aspects of example communications device. DETAILED DESCRIPTION Aspects of the present disclosure provide apparatuses, methods, processing systems, and computer-readable mediums for managing sidelink feedback-based transmissions in a multiple radio access technology (RAT) scenario with a same channel co-existence. In some networks, user equipments (UEs) may be capable of communicating directly with each other using sidelink signals. Real-world applications of