Methods, systems, and devices for wireless communications are described. Generally, a reconfigurable intelligent surface (RIS) may transmit a capability information message including an indicating that the RIS is capable of participating in network communications and communicating with other RISs on the network. A first RIS may communicate beam information to a second RIS directly, or the first RIS may communicate beam information to the second RIS via a base station, or the first RIS may communicate beam information to the second RIS via a user equipment (UE). In some examples, one RIS may request beam information or reflecting assistance from another RIS.

Techniques for configuring reconfigurable intelligent surfaces serving full-duplex nodes are provided. In an example, a first network node such as a base station or a user equipment (UE) may determine to communicate with a second network node (e.g., UE or base station) via a reconfigurable intelligent surface (RIS) system using full-duplex communications. The first network node may transmit, to an RIS controller of the RIS system, an indication that the first network node will communicate with the second network node using the full-duplex communications.

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for indicating or switching among or between different precoding types for one or more communication elements. The one or more communication elements may be antennas of a wireless communication device (e.g., a UE or a BS) or elements of a reconfigurable intelligent surface (RIS). Techniques herein relate to indicating to one or more devices which precoding type to use for precoding one or more communication elements. For example, the techniques herein may be used for precoding communication elements of any suitable wireless communication device, such as antennas of a UE or BS, or RIS elements of a RIS.

A beam-steering backscatter circuit in an integrated tag device. The circuit includes an antenna array and SP4T reflector array configured to receive and transmit through the antenna array. A baseband phase-shifting module modulates an incident signal based upon tag data to create an output signal and re-radiates the output signal with a controllable angle of direction through the SP4T reflector array. A phase locked loop synchronized with a wake-up receiver provides an intermediate frequency (IF) clock to the baseband phase shifting-module.

The disclosed system uses a less complex system of a single radio receiver-frontend with a phase-reconfigurable reflectarray and an antenna to form beams in directions of the desired arriving signals while forming nulls in directions of the arriving radio interference signals. This is done by configuring each reflector with an appropriate phase-shift state so that the amplification of the desired radio signals and the nulling of the undesired radio signals happen at the point all reflected radio signals combine at the antenna (before the receiver frontend). In comparison, a conventional digital receive array achieves beams and nulls by taking the sampled radio signal streams at the outputs of the receiver frontends, multiplies each sample stream by a digital weight to shift the stream's phase and/or amplitude and then combines the sample streams into one sample stream in which desired radio signals are amplified and undesired radio signals are attenuated.

Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) engages in a positioning session or a sensing session and receives, from a network entity, assistance data for at least one positioning reference signal (PRS) resource transmitted by a transmission point, the assistance data including a PRS resource location field indicating a geographic location of the transmission point, the assistance data further including reflection point object (RPO) information for at least one RPO that is capable of reflecting a waveform associated with the at least one PRS resource, the RPO information including at least location information for the at least one RPO.

Reconfigurable Intelligent Surface devices, RIS, may be used to improve receipt of radio signals received by wireless transmit-receive units, WTRUs, in a given area. In such area, WTRUs may receive radio signals directly from the transmitter, and indirectly, via reflection of the radio signals from the transmitter by the RIS device. A RIS may consist of programmable sub-wavelength sized unit cells placed in close proximity. Each unit cell behaves like a scatterer. Embodiments of a new RIS structure are described here, being based on a nearly passive reflecting platform. In a Nearly-Passive RIS structure according to embodiments, NP-RIS, each unit cell is programmed to have a constant invariable phase-shift. Embodiments of a unit cell selection method are described, to control the reflected wave by selecting a subset of unit cells whose reflection could assist coherent alignment of the reflected wave with the main direct signal at the WTRU.

A method and apparatus for a reflective intelligent surface (RIS) control interface. The apparatus transmits, to a RIS, a synchronization signal to establish a level of synchronization between the base station and the RIS. The level of synchronization between the base station and the RIS configures the RIS to receive a control signal from the base station. The apparatus transmits, to the RIS, the control signal comprising a RIS configuration. The apparatus may transmit, to the RIS, a signal for reflection by the RIS to at least a first wireless device.

Apparatuses, methods, and systems are disclosed for controlling a reconfigurable intelligent surface device. One method (500) includes determining (502) a control signal for a reconfigurable intelligent surface device to control a parameter of at least one element of a plurality of elements of the reconfigurable intelligent surface device. The parameter includes information indicating a phase angle. The method (500) includes transmitting (504) the control signal to the reconfigurable intelligent surface device to control the parameter of the at least one element of the reconfigurable intelligent surface device.

Techniques and apparatuses are described for modifying a position of an adaptive phase-changing device, APD. In aspects, a base station receives, from a user equipment, UE, at least one link quality parameter that is indicative of a channel impairment. The base station then identifies, using the at least one link quality parameter, a surface configuration for a reconfigurable intelligent surface (RIS) of an adaptive phase-changing device (APD) and transmits a first indication of the surface configuration using an adaptive phase-changing device control channel, APD control channel. In aspects, the base station determines using the at least one link quality parameter, a position configuration for the APD and transmits a second indication of the position configuration to the APD. The base station then communicates with the UE using the APD.