Search

US-20260129578-A1 - BACKSCATTER COMMUNICATIONS IN A MULTI-STATIC SCENARIO

US20260129578A1US 20260129578 A1US20260129578 A1US 20260129578A1US-20260129578-A1

Abstract

Certain aspects of the present disclosure provide techniques for backscatter communications. An example method includes sending, to a first set of backscatter devices, one or more first signals via a first transmit beam at a first transmit power in one or more first transmission occasions; and sending, to a second set of backscatter devices, one or more second signals via a second transmit beam at a second transmit power in one or more second transmission occasions.

Inventors

  • Piyush Gupta
  • Raviteja Patchava
  • Le Liu
  • Yuchul Kim

Assignees

  • QUALCOMM INCORPORATED

Dates

Publication Date
20260507
Application Date
20250918

Claims (20)

  1. 1 . An apparatus for wireless communications, comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause a first device to: send, to a first set of backscatter devices, one or more first signals via a first transmit beam at a first transmit power in one or more first transmission occasions; and send, to a second set of backscatter devices, one or more second signals via a second transmit beam at a second transmit power in one or more second transmission occasions.
  2. 2 . The apparatus of claim 1 , wherein: the first set of backscatter devices includes a first backscatter device; the second set of backscatter devices includes a second backscatter device that is different from the first backscatter device; the first transmit beam is different from the second transmit beam; the first transmit power is different from the second transmit power; and the one or more first transmission occasions are non-overlapping in time with the one or more second transmission occasions.
  3. 3 . The apparatus of claim 1 , wherein the processing system is configured to cause the first device to send, to a third set of backscatter devices, one or more third signals via the first transmit beam at a third transmit power in one or more third transmission occasions.
  4. 4 . The apparatus of claim 1 , wherein: the first transmit power is based at least in part on a first path loss between the first set of backscatter devices and a second device; and the second transmit power is based at least in part on a second path loss between the second set of backscatter devices and the second device.
  5. 5 . The apparatus of claim 1 , wherein to cause the first device to send the one or more first signals, the processing system is configured to cause the first device to send the one or more first signals via the first transmit beam and a third transmit beam.
  6. 6 . The apparatus of claim 1 , wherein: to cause the first device to send the one or more first signals, the processing system is configured to cause the first device to send the one or more first signals in a first inventory procedure; and to cause the first device to send the one or more second signals, the processing system is configured to cause the first device to send the one or more second signals in a second inventory procedure.
  7. 7 . The apparatus of claim 1 , wherein the one or more first signals includes one or more of a query message, a device-to-reader (D2R) link grant, an acknowledgement message, or a negative acknowledgement message.
  8. 8 . The apparatus of claim 7 , wherein the D2R link grant indicates a sequence associated with communication based at least in part on code division multiplexing.
  9. 9 . The apparatus of claim 7 , wherein the D2R link grant indicates one or more time-frequency resources associated with communication based at least in part on frequency division multiplexing.
  10. 10 . The apparatus of claim 1 , wherein: the first device includes a first network node; and the first set of backscatter devices includes an ambient internet of things (IoT) device.
  11. 11 . An apparatus for wireless communications, comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause a backscatter device to: obtain a first signal, associated with a first sector, in one or more first transmission occasions; send a second signal in one or more second transmission occasions; obtain an indication to ignore signaling associated with a second sector for a time period; obtain a third signal associated with the second sector during the time period; and refrain from sending a reply associated with the third signal.
  12. 12 . The apparatus of claim 11 , wherein: the first sector is different from the second sector; and the one or more first transmission occasions are non-overlapping in time with the one or more second transmission occasions.
  13. 13 . The apparatus of claim 11 , wherein the indication to ignore signaling includes an acknowledgement message that indicates to ignore the signaling associated with the second sector.
  14. 14 . The apparatus of claim 11 , wherein the third signal includes a query message that includes the indication to ignore the signaling.
  15. 15 . The apparatus of claim 11 , wherein the first signal includes an indication of the first sector.
  16. 16 . The apparatus of claim 11 , wherein: the processing system is configured to cause the backscatter device to obtain an energy excitation signal from a radio frequency energy exciter; and to cause the backscatter device to send the second signal, the processing system is configured to cause the backscatter device to send a backscatter of the energy excitation signal, wherein the backscatter includes the second signal.
  17. 17 . The apparatus of claim 11 , wherein: to cause the backscatter device to obtain the first signal, the processing system is configured to cause the backscatter device to obtain the first signal from a first network node; and to cause the backscatter device to send the second signal, the processing system is configured to cause the backscatter device to send the second signal to a second network node.
  18. 18 . The apparatus of claim 11 , wherein: to cause the backscatter device to obtain the first signal, the processing system is configured to cause the backscatter device to obtain the first signal from a network node; and to cause the backscatter device to send the second signal, the processing system is configured to cause the backscatter device to send the second signal to the network node.
  19. 19 . The apparatus of claim 11 , wherein: to cause the backscatter device to obtain the first signal, the processing system is configured to cause the backscatter device to obtain the first signal in an inventory procedure; and to cause the backscatter device to send the second signal, the processing system is configured to cause the backscatter device to send the second signal in the inventory procedure.
  20. 20 . A method for wireless communications by a first device, comprising: sending, to a first set of backscatter devices, one or more first signals via a first transmit beam at a first transmit power in one or more first transmission occasions; and sending, to a second set of backscatter devices, one or more second signals via a second transmit beam at a second transmit power in one or more second transmission occasions.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) The present application for Patent claims benefit of and priority to U.S. Provisional Application No. 63/715,953, filed Nov. 4, 2024, which is herein incorporated by reference in its entirety. INTRODUCTION Field of the Disclosure Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for backscatter communications in a multi-static scenario. 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 Certain aspects provide a method for wireless communications by a first device. The method includes sending, to a first set of backscatter devices, one or more first signals via a first transmit beam at a first transmit power in one or more first transmission occasions; and sending, to a second set of backscatter devices, one or more second signals via a second transmit beam at a second transmit power in one or more second transmission occasions. Certain aspects provide a method for wireless communications by a first device. The method includes obtaining, from a first set of backscatter devices, one or more first signals via a first receive beam within a first set of received signal powers in one or more first transmission occasions; and obtaining, from a second set of backscatter devices, one or more second signals via a second receive beam within a second set of received signal powers in one or more second transmission occasions. Certain aspects provide a method for wireless communications by a first device. The method includes sending, to a first set of backscatter devices, a first signal via a first beam at a first transmit power in one or more first transmission occasions; obtaining, from the first set of backscatter devices, a first set of signals via the first beam within a first set of received signal powers in one or more second transmission occasions; sending, to a second set of backscatter devices, a second signal via a second beam at a second transmit power in one or more third transmission occasions; and obtaining, from the second set of backscatter devices, a second set of signals via the second beam within a second set of received signal powers in one or more fourth transmission occasions. Certain aspects provide a method for wireless communications by a first device. The method includes sending, to a first set of backscatter devices, one or more first energy excitation signals at a first transmit power in one or more first transmission occasions; and sending, to a second set of backscatter devices, one or more second energy excitation signals at a second transmit power in one or more second transmission occasions. Certain aspects provide a method for wireless communications by a backscatter device. The method includes obtaining a first signal, associated with a first sector, in one or more first transmission occasions; sending a second signal in one or more second transmission occasions; obtaining an indication to ignore signaling associated with a second sector for a time period; obtaining a third signal associated with the second sector during the time period; and refraining from sending a reply associated with the third signal. Other aspects provide: one or more apparatuses operable, configured, or otherwise adapted to perform any portion of any method described herein (e.g., such that performance may be by only one apparatus or in a di