US-12627404-B2 - Information transfer via channel-adaptive space time block codes over reconfigurable intelligent surfaces

Abstract

Methods, systems, and devices for wireless communications are described. Generally, the techniques described herein may enable information transfer via channel-adaptive space time block codes (STBCs) over reconfigurable intelligent surfaces (RISs). For example, a network entity may transmit a control message indicating a set of parameters associated with an STBC of multiple STBCs associated with a RIS, where the set of parameters includes a size of the STBC. The network entity may transmit, to the RIS, a downlink message and the RIS may encode one or more information bits on the downlink message according to the parameters associated with the STBC. Additionally, the RIS may reflect the downlink message to a UE based on the set of parameters, where the reflected message includes the one or more information bits, and the UE may identify the one or more information bits based on a detection procedure associated with the set of parameters.

Inventors

• Yavuz YAPICI
• Junyi Li

Assignees

• QUALCOMM INCORPORATED

Dates

Publication Date

20260512

Application Date

20230517

Claims (20)

1. 1 . An apparatus for wireless communications at a network entity, comprising: at least one processor; and at least one memory coupled with the at least one processor, wherein the at least one memory comprises instructions executable by the at least one processor to cause the apparatus to: transmit a first message indicating a set of parameters associated with a space time block code (STBC) from a plurality of STBCs associated with a wireless node, where the set of parameters comprises at least a size of the STBC; and transmit a second message on which the wireless node determines whether to encode one or more information bits according to the set of parameters associated with the STBC.
2. 2 . The apparatus of claim 1 , wherein the STBC is associated with a plurality of channels, and the instructions are further executable by the at least one processor to cause the apparatus to: transmit, to the wireless node, a plurality of reference signals, wherein the plurality of reference signals are transmitted via the plurality of channels associated with the STBC.
3. 3 . The apparatus of claim 2 , wherein the instructions are further executable by the at least one processor to cause the apparatus to: receive, from the wireless node, a measurement report indicating a correlation metric associated with the plurality of channels.
4. 4 . The apparatus of claim 3 , wherein the instructions are further executable by the at least one processor to cause the apparatus to: transmit a control message indicating a modification to the size of the STBC based at least in part on the correlation metric.
5. 5 . The apparatus of claim 3 , wherein the instructions are further executable by the at least one processor to cause the apparatus to: transmit a control message indicating for the wireless node to transmit the measurement report, wherein transmitting the measurement report is based at least in part on receiving the control message.
6. 6 . The apparatus of claim 4 , wherein the modification increases the size of the STBC based at least in part on the correlation metric exceeding a threshold.
7. 7 . The apparatus of claim 4 , wherein the modification decreases the size of the STBC based at least in part on the correlation metric failing to exceed a threshold.
8. 8 . The apparatus of claim 1 , wherein the set of parameters comprise a type of the STBC, a start time associated with the wireless node reflecting the second message comprising the one or more encoded information bits, a stop time associated with the wireless node reflecting the second message comprising the one or more encoded information bits, or any combination thereof.
9. 9 . The apparatus of claim 8 , wherein the type of STBC comprises a multi-symbol STBC type, and wherein the set of parameters further comprises a pattern associated with transmitting the one or more information bits in a time domain.
10. 10 . The apparatus of claim 8 , wherein the first message is a downlink control information message or a radio resource control message.
11. 11 . The apparatus of claim 1 , wherein the instructions are further executable by the at least one processor to cause the apparatus to: transmit, to a user equipment (UE), one or more reference signals within a threshold duration of transmitting the second message, wherein a channel used to transmit the one or more reference signals is the same as a channel used to transmit the second message.
12. 12 . The apparatus of claim 1 , wherein the instructions are further executable by the at least one processor to cause the apparatus to: receive, from the wireless node, a third message indicating a capability of the wireless node to support encoding information bits via a space time code block, wherein the set of parameters it based at least in part on the capability of the wireless node.
13. 13 . The apparatus of claim 12 , wherein the third message indicates a threshold quantity of sub-regions associated with the wireless node, and wherein the size of the STBC is based at least in part on the threshold quantity.
14. 14 . The apparatus of claim 1 , wherein the size of the STBC is based at least in part on a quantity of sub-regions associated with the wireless node, and wherein each sub-region is associated with a channel of a plurality of channels associated with the wireless node.
15. 15 . An apparatus for wireless communications at a wireless node, comprising: at least one processor; and at least one memory coupled with the at least one processor, wherein the at least one memory comprises instructions executable by the at least one processor to cause the apparatus to: receive, from a network entity, a first message indicating a set of parameters associated with a space time block code (STBC) from a plurality of STBCs associated with the wireless node, where the set of parameters comprises at least a size of the STBC; receive, from the network entity, a second message on which the wireless node encodes one or more information bits according to the set of parameters associated with the STBC; and reflect the second message to a user equipment (UE) based at least in part on the set of parameters, wherein the reflected second message includes the one or more encoded information bits.
16. 16 . The apparatus of claim 15 , wherein the STBC is associated with a plurality of channels, and the instructions are further executable by the at least one processor to cause the apparatus to: receive a plurality of reference signals, wherein the plurality of reference signals are transmitted via the plurality of channels associated with the STBC.
17. 17 . The apparatus of claim 16 , wherein the instructions are further executable by the at least one processor to cause the apparatus to: transmit a measurement report indicating a correlation metric associated with the plurality of channels.
18. 18 . The apparatus of claim 17 , wherein the instructions are further executable by the at least one processor to cause the apparatus to: receive a control message indicating a modification to the size of the STBC based at least in part on the correlation metric.
19. 19 . The apparatus of claim 17 , wherein the instructions are further executable by the at least one processor to cause the apparatus to: receive a control message indicating for the wireless node to transmit the measurement report, wherein transmitting the measurement report is based at least in part on receiving the control message.
20. 20 . The apparatus of claim 18 , wherein the modification increases the size of the STBC based at least in part on the correlation metric exceeding a threshold.

Description

FIELD OF TECHNOLOGY The following relates to wireless communications, including information transfer via channel-adaptive space time block codes (STBCs) over reconfigurable intelligent surfaces (RISs). BACKGROUND Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE). SUMMARY The described techniques relate to improved methods, systems, devices, and apparatuses that support information transfer via channel-adaptive space time block codes (STBCs) over reconfigurable intelligent surfaces (RISs). Generally, the techniques described herein may enable a network entity to transit an indication of an STBC from multiple STBCs associated with a RIS, such that the RIS may encode data associated with the RIS, such as identifier data, maintenance results, or sensor information, onto a reflected signal using the indicated STBC. For example, a network entity may transmit, to an RIS and a user equipment (UE), a control message indicating a set of parameters associated with an STBC from multiple STBCs associated with the RIS. The set of parameters may include a size of the STBC, a type of the STBC, timing information associated with transmission of RIS data (e.g., the data associated with the RIS to be transmitted via the STBC by modulating the reflected signal), or any combination thereof. Additionally, the network entity may transmit, to the RIS, a downlink signal (e.g., message) on which the RIS may encode the RIS data (e.g., the one or more information bits associated with the RIS) using the STBC (e.g., according to the set of parameters). As such, the RIS may reflect the downlink signal carrying the RIS data (e.g., including the one or more information bits) to the UE based on the set of parameters and the UE may receive the reflected signal. Additionally, the UE may identify the RIS data based on a detection procedure (e.g., based on using a detection algorithm) associated with the set of parameters. Additionally, the network entity may adjust a size of the STBC based on a correlation metric associated with multiple channels further associated with the STBC. In other words, the RIS may be associated with a quantity of subregions, or channels, where each channel is associated with an STBC block of the STBC. As such, the network entity may transmit a set of reference signals via the RIS, where each reference signal is transmitted via a channel of the RIS. In such cases, the RIS may determine a correlation metric associated with the channels of the RIS and may transmit, to the network entity, a measurement report indicating the correlation metric. In some examples, the network entity may modify a size of the STBC, or size of the STBC blocks (e.g., further modifying the quantity of subregions of the RIS), based on the correlation metric. That is, the network entity may increase a size of the STBC, or decrease a size of the STBC blocks (e.g., increase the quantity of subregions) based on whether the correlation metric exceeds a threshold or not. A method for wireless communications at a network entity is described. The method may include transmitting a first message indicating a set of parameters associated with a STBC from a set of multiple STBCs associated with a wireless node, where the set of parameters includes at least a size of the STBC and transmitting a second message on which the wireless node determines whether to encode one or more information bits according to the set of parameters associated with the STBC.s. An apparatus for wireless communications at a network entity is described. The apparatus may include at least one processor, at least one memory coupled with the at least one processor, and instructions stored in the at least one memory. The instructions may be executable by the at least one processor to cause the apparatus to transmit a first message indicating a set of parameters associated with a STBC from a set of multiple STBCs associated with a wireless node, where the set of parameters includes at least a