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US-12621042-B2 - Back-compatible reconfigurable intelligent surface discovery via signatured wireless sensing

US12621042B2US 12621042 B2US12621042 B2US 12621042B2US-12621042-B2

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless node may transmit, to a reconfigurable intelligent surface (RIS), a first signal modulated using a first modulation signature, wherein the first modulation signature is an inverted modulation signature associated with a second modulation signature to be applied by the RIS. The first wireless node may receive, from a second wireless node, a second signal indicating that the first signal has been redirected by the RIS and received by the second wireless node. Numerous other aspects are described.

Inventors

  • Yucheng Dai
  • Wooseok Nam
  • Tao Luo

Assignees

  • QUALCOMM INCORPORATED

Dates

Publication Date
20260505
Application Date
20210917

Claims (20)

  1. 1 . A first wireless node for wireless communication, comprising: one or more memories; and one or more processors coupled to the one or more memories, the one or more processors configured to cause the first wireless node to: transmit, to a reconfigurable intelligent surface (RIS), a first signal modulated by a first modulation signature, wherein the first modulation signature is an inverted modulation signature associated with a second modulation signature associated with the RIS; and receive, from a second wireless node, a second signal that indicates the first signal has been received by the second wireless node.
  2. 2 . The first wireless node of claim 1 , wherein the one or more processors, to transmit the first signal modulated by the first modulation signature, are configured to cause the first wireless node to: modulate the first signal by the first modulation signature such that the first signal is undecodable unless the first signal is modulated by the second modulation signature to reverse the first modulation signature.
  3. 3 . The first wireless node of claim 1 , wherein the second modulation signature is a RIS modulation signature associated with the RIS and the first modulation signature is an inverted RIS modulation signature that is reversed by the RIS modulation signature associated with the RIS.
  4. 4 . The first wireless node of claim 1 , wherein the second modulation signature is a beam-specific RIS modulation signature applied to one or more reflection beams associated with the RIS, and the first modulation signature is an inverted beam-specific RIS modulation signature that is reversed by the beam-specific RIS modulation signature.
  5. 5 . The first wireless node of claim 1 , wherein the first wireless node is a first user equipment (UE) and the second wireless node is a second UE.
  6. 6 . The first wireless node of claim 5 , wherein the one or more processors are further configured to cause the first wireless node to: receive, from a network entity, information associated with the RIS.
  7. 7 . The first wireless node of claim 6 , wherein the one or more processors are further configured to cause the first wireless node to: transmit, to the network entity, a request for the information associated with the RIS.
  8. 8 . The first wireless node of claim 6 , wherein the second modulation signature is a RIS modulation signature associated with the RIS and the first modulation signature is an inverted RIS modulation signature that is reversed by the RIS modulation signature associated with the RIS, and wherein the information includes at least one of an indication of the RIS modulation signature or an indication of the inverted RIS modulation signature.
  9. 9 . The first wireless node of claim 6 , wherein the second modulation signature is a beam-specific RIS modulation signature associated with the RIS and the first modulation signature is an inverted beam-specific RIS modulation signature that is reversed by the beam-specific RIS modulation signature, and wherein the information includes at least one of an indication of the beam-specific RIS modulation signature or an indication of the inverted beam-specific RIS modulation signature.
  10. 10 . The first wireless node of claim 6 , wherein the first modulation signature is a UE modulation signature associated with the first UE and the second modulation signature is an inverted UE modulation signature that reverses the UE modulation signature associated with the first UE.
  11. 11 . The first wireless node of claim 10 , wherein the one or more processors are further configured to cause the first wireless node to: determine the UE modulation signature based at least in part on a modulation capability of the RIS indicated in the information associated with the RIS; and transmit, to the network entity, an indication of the UE modulation signature.
  12. 12 . The first wireless node of claim 1 , wherein the one or more processors, to transmit the first signal modulated by the first modulation signature, are configured to cause the first wireless node to: sweep the first signal over a plurality of beam directions, wherein the second signal indicates a beam direction associated with the RIS in the plurality of beam directions.
  13. 13 . The first wireless node of claim 12 , wherein the second signal further indicates a RIS state associated with the RIS.
  14. 14 . The first wireless node of claim 1 , wherein the first wireless node is a network entity and the second wireless node is a user equipment (UE).
  15. 15 . A second wireless node for wireless communication, comprising: one or more memories; and one or more processors coupled to the one or more memories, the one or more processors configured to cause the second wireless node to: receive a first signal from a reconfigurable intelligent surface (RIS); decode the first signal; and transmit, to a first wireless node and based at least in part on decoding the first signal, a second signal that indicates the first signal has been received by the second wireless node, wherein a timing of the second signal indicates a beam direction associated with the RIS.
  16. 16 . The second wireless node of claim 15 , wherein the first signal is undecodable by the second wireless node unless the first signal is redirected by the RIS.
  17. 17 . The second wireless node of claim 15 , wherein the second signal indicates the beam direction associated with the RIS.
  18. 18 . The second wireless node of claim 17 , wherein the second signal indicates a RIS state associated with the RIS.
  19. 19 . The second wireless node of claim 15 , wherein the first wireless node is a first user equipment (UE) and the second wireless node is a second UE.
  20. 20 . The second wireless node of claim 15 , wherein the first wireless node is a network entity and the second wireless node is a user equipment (UE).

Description

INTRODUCTION Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for reconfigurable intelligent surface (RIS) discovery using wireless sensing. Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, or the like). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP). A wireless network may include one or more base stations that support communication for a user equipment (UE) or multiple UEs. A UE may communicate with a base station via downlink communications and uplink communications. “Downlink” (or “DL”) refers to a communication link from the base station to the UE, and “uplink” (or “UL”) refers to a communication link from the UE to the base station. The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate on a municipal, national, regional, and/or global level. New Radio (NR), which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP. NR is designed to better support mobile broadband internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM and/or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful. SUMMARY Some implementations described herein relate to a first wireless node for wireless communication. The first wireless node may include a memory and one or more processors coupled to the memory. The first wireless node may be configured to transmit, to a reconfigurable intelligent surface (RIS), a first signal modulated using a first modulation signature, wherein the first modulation signature is an inverted modulation signature associated with a second modulation signature to be applied by the RIS. The first wireless node may be configured to receive, from a second wireless node, a second signal indicating that the first signal has been redirected by the RIS and received by the second wireless node. Some implementations described herein relate to a second wireless node for wireless communication. The second wireless node may include a memory and one or more processors coupled to the memory. The second wireless node may be configured to receive a first signal. The second wireless node may be configured to decode the first signal, wherein the first signal being decodable indicates that the first signal has been redirected by a RIS. The second wireless node may be configured to transmit, to a first wireless node and based at least in part on decoding the first signal, a second signal indicating that the first signal has been reflected by the RIS and received by the second wireless node. Some implementations described herein relate to a RIS for wireless communication. The reconfigurable intelligent surface may include a memory and one or more processors coupled to the memory. The RIS may be configured to receive, from a first wireless node, a sensing signal modulated by a first modulation signature. The RIS may be configured to redirect the sensing signal modulated using a second modulation signature that reverses the first modulation signature. Some implementations described herein relate to a method of wireless communication performed by a first wireless node. The method may include transmitting, to a RIS, a first signal modulated using a first modulation signature, wherein the first modulation signature is an inverted modulation signature associated with a second modulation signature to be applied by the RIS. The method may include receiving, from a second wireless