Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a composite surface system may include a transmissive surface (TS) component capable of transmitting a wireless communication signal incident on the TS component, transmitting the wireless communication signal within a transmissive field-of-view (FoV), and configured to limit signal strength loss of one or more radio frequencies of the wireless communication signal. In some aspects, the composite surface system may include a reflective surface (RS) component capable of reflecting the wireless communication signal within a reflective FoV. The RS component may include a non-uniform pattern region associated with controlling a size of the reflective FoV.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may transmit, to a reconfigurable intelligent surface (RIS), configuration information to configure the RIS to apply a set of RIS patterns associated with one or more calibration codebooks during an RIS calibration procedure. The network node may receive one or more reference signal received power (RSRP) measurement reports associated with one or more pilot signals that are transmitted during the RIS calibration procedure and while the RIS is applying the set of RIS patterns associated with the one or more calibration codebooks. The network node may update a data communication codebook based at least in part on the one or more RSRP measurement reports. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. Techniques described herein provide for a network entity to determine a beam focusing distance for a reconfigurable intelligent surface (RIS) for a user equipment (UE) located in the near field region of the RIS. The beam focusing distance may be determined using reference signals for different test beam focusing distances within the near field region of the RIS. The test beams may have a same angular direction from the RIS to the UE. The test beams may have a beam focusing distance selected from a set of beam focusing distances within the near field region of the RIS.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive transmissive surface information via a data marker. The UE may receive a downlink signal via a transmissive surface associated with the transmissive surface information. The UE may transmit a measurement report associated with the downlink signal received via the transmissive surface, wherein the transmissive surface information includes one or more of: a transmissive surface location, attribute information associated with the transmissive surface, one or more synchronization signal block (SSB) parameters, or SSB beam information. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A forwarding device (e.g., a reconfigurable intelligent surface (RIS)) may transmit a capability message indicating one or more timing parameters associated with a time duration for the forwarding device to switch a set of forwarding elements from forwarding in a first direction to forwarding in a second direction. The forwarding device may receive, based on the indicated one or more timing parameters, one or more control messages that instructs the forwarding device to forward signal energy in the first direction during a first symbol period and to forward signal energy in the second direction during a second symbol period. The first symbol period may be different from the second symbol period. The forwarding device may include a primary array including a first set of forwarding elements and a secondary array including a second set of forwarding elements.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first network entity may transmit, to a forwarding-capable network entity and at a first time, a first forwarding configuration. The first network entity may transmit, to the forwarding-capable network entity and at a second time, a second forwarding configuration, wherein the transmission is associated with an amount of time between the first time and the second time. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless communication device may transmit, to a second wireless communication device, coordination information associated with receiving a multi-layer communication from a network node via multiple transmissive surfaces. The first wireless communication device may receive the multi-layer communication from the network node via the multiple transmissive surfaces. Numerous other aspects are described.

Abstract: Aspects described herein relate to configuring one or more reflective elements and a background element of an intermediate wireless device to reflect wireless signals. A first indication for configuring one or more reflective elements on the intermediate wireless device can be received from a network node. The one or more reflective elements can be configured based on the first indication. A second indication for configuring a state of a background element of the intermediate wireless device can be received from the network node. The state of the background element can be configured based on the second indication. Other aspects relate to transmitting the indications to configure the intermediate wireless device.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a beam reflecting device may receive target reflection angle information that indicates a target reflection angle range for reflect beams. The beam reflecting device may select one or more reflect beams based at least in part on the target reflection angle information. The beam reflecting device may transmit reflected power angle spectrum information that indicates the one or more reflect beams. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. The described techniques provide for a network entity to indicate a desired beamforming coverage scheme to a controller of a reconfigurable intelligent surface (RIS). The RIS controller may identify one or more realizable multi-lobe beamforming patterns in accordance with the desired beamforming coverage scheme, and may transmit multi-lobe beam information indicating the one or more realizable multi-lobe beamforming patterns to the network entity. In some cases, the RIS may indicate single-lobe beam information to the network entity, and the network entity may transmit one or more vectors to support generating the multi-lobe beam information. In some examples, based on the multi-lobe beam information, the network entity may indicate a multi-lobe beamforming pattern that the RIS is to use for relaying a multi-lobe reflect beam or a multi-lobe incident beam.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a composite surface system may include a transmissive surface (TS) component capable of transmitting a wireless communication signal incident on the TS component, transmitting the wireless communication signal within a transmissive field-of-view (FoV), and configured to limit signal strength loss of one or more radio frequencies of the wireless communication signal. In some aspects, the composite surface system may include a reflective surface (RS) component capable of reflecting the wireless communication signal within a reflective FoV. The RS component may include a non-uniform pattern region associated with controlling a size of the reflective FoV.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmissive system may include a surface at least partially transparent to light. The transmissive system may further include a coating on the surface configured to reduce emissivity of the surface for infrared and ultraviolet radiation. The transmissive system may include a pattern on the surface formed by a treatment configured to reduce signal loss of one or more radio frequencies. The pattern may be configured to result in a target transmission field of view for the one or more radio frequencies.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network entity may receive an indication of a reconfigurable intelligent surface (RIS) configuration associated with a first network node and an indication of one or more RIS codebooks associated with one or more second network nodes. The network entity may transmit, using the RIS configuration associated with the first network node, the one or more RIS codebooks associated with the one or more second network nodes, and one or more link parameters associated with the first network node, an indication of a RIS codebook containing at least one RIS configuration that is associated with the first network node and the one or more second network nodes. Numerous other aspects are described.

Abstract: Certain aspects of the present disclosure provide techniques for reconfigurable intelligent surface (RIS) deformation mitigation. A method generally includes configuring a plurality of nodes with a plurality of resources for communicating a plurality of signals with the apparatus or a network entity via a RIS comprising a plurality of RIS elements; obtaining observation information associated with the plurality of signals communicated between the plurality of nodes and the apparatus or the network entity via the RIS; determining an RIS element deformation for at least one RIS element based on the observation information and a deformation database associated with the RIS, the deformation database providing a mapping between a plurality of RIS element deformations and one or more observations expected for each of the plurality of RIS element deformations; and sending a codebook pattern update to compensate for the RIS element deformation for the at least one RIS element.

Abstract: Methods, systems, and devices for wireless communications are described. A network entity may utilize parameterized codebooks to support reconfigurable intelligent surface (RIS)-assisted communications. For example, a network entity may receive an indication of one or more codebooks associated with respective sets of parameters including one or more of a respective field of view (FOV) or a respective configuration switching latency, among other parameters. The network entity may select a codebook for RIS-assisted communications based on whether the codebook satisfies one or more thresholds. The network entity may indicate the codebook to a RIS controller and may communicate one or more messages with a user equipment (UE) using a RIS in accordance with the indicated codebook.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmission reception point (TRP) may transmit, to a network node, capability information indicating a capability of the TRP to cycle through a set of beamforming weight-vectors when the TRP is performing a transmission. The TRP may receive, from the network node and based at least in part on the capability information, an indication of one or more beamforming-weight-vectors-cycling parameters. The TRP may perform the transmission by cycling through the set of beamforming weight-vectors based at least in part on the one or more beamforming-weight-vectors-cycling parameters. Numerous other aspects are described.

Abstract: The apparatus may be an intermediate wireless device comprising an array of configurable elements (e.g., an array of configurable reflective elements or a plurality of configurable antenna elements) that may be configured to obtain, based on a decreased signal quality at a user equipment (UE), a first set of configurations of a plurality of configurable elements of the intermediate wireless device for a first interference-direction sensing operation, perform, based on the first set of configurations of the plurality of configurable elements, the first interference-direction sensing operation, and obtain an indication of a configuration of the plurality of configurable elements for a subsequent communication between a network device and the UE based on the first interference-direction sensing operation.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter may transmit, to a first receiver and via an anchor node, a first layer of data. The transmitter may transmit, to a second receiver and via one or more helper nodes and the anchor node, a second layer of data, wherein the second layer of data is spatial domain multiplexed with the first layer of data, and a high effective rank channel is created between the transmitter and the anchor node using a combination of the one or more helper nodes. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network entity may receive an indication of a reconfigurable intelligent surface (RIS) configuration associated with a first network node and an indication of one or more RIS codebooks associated with one or more second network nodes. The network entity may transmit, using the RIS configuration associated with the first network node, the one or more RIS codebooks associated with the one or more second network nodes, and one or more link parameters associated with the first network node, an indication of a RIS codebook containing at least one RIS configuration that is associated with the first network node and the one or more second network nodes. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A network entity may output an array configuration to a configurable reflective device (CRD), wherein the array configuration defines a first angle of reflection or refraction at a first frequency and a second angle of reflection or refraction at a second frequency for a reflective array of the CRD. The network entity may output a first transmission, to a first user equipment (UE) via the CRD, at the first frequency according to the array configuration, the first frequency selected based on the first angle of reflection or refraction and a first location of the first UE. The network entity may output a second transmission, to a second UE via the CRD, at the second frequency according to the array configuration, the second frequency selected based on the second angle of reflection or refraction and a second location of the second UE.