Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration for a transmission configuration state for receiving downlink channel transmissions from a base station via a configurable surface. The transmission configuration state may indicate a quasi-co-location source associated with transmission via the configurable surface. The UE may receive a downlink channel transmission via the configurable surface based on the transmission configuration state and the quasi-co-location source. The UE may be capable of determining whether the transmission configuration state conflicts with the quasi-co-location source indicated by the transmission configuration state. The UE may transmit an indication to the base station that the configuration for the transmission configuration state conflicts with the quasi-co-location source. The indication may include a beam failure indication or a measurement report. The UE may fall back to a transmission configuration state previously activated at the UE.

A reconfigurable intelligent surface (RIS) includes one or more radio frequency identification (RFID) tags. The one or more RFID tags may perform functions of a controller of the RIS. The one or more RFID tags receive a reference signal from a wireless communications device. The RIS may process the received reference signal and the one or more RFID tags backscatter a response signal to the wireless communications device. The wireless communications device may also perform processing of the backscattered response. Processing includes measuring channels from the wireless communication to the RFID tags. Processing also includes estimating channels from the wireless communication to elements of the RIS. Based on the estimated channels, a beam matrix corresponding to optimized weights of the RIS elements is determined and transmitted to the RIS.

The technology described herein is directed towards a reconfigurable intelligent surface (RIS) that harvests RF energy from incoming signals based on energy harvesting antennas and associated energy harvesting circuitry. At the same time RIS elements (unit cells) redirect the incoming signals towards a predetermined direction. The harvested energy is combined and converted to DC power using a harvesting circuit. In one implementation, a dual-mode energy harvesting circuit employs a higher power rectifier subcircuit and a lower power rectifier subcircuit, with a multiport circulator and switch that self-actuates to use one or the other rectifier subcircuit based on the combined RF input power captured by the energy harvesting antennas. A multiple battery approach is described, in which one battery is charging based on the converted DC power, another, previously-charged battery is powering the reconfigurable intelligent surface components.

The technology described herein is directed towards a metasurface (reconfigurable intelligent surface) that can be used to redirect signals to and from non-terrestrial network satellites. The metasurface can be passive, and provide signal array gain with respect to indoor user equipment sending and receiving signals to and from the network satellites. The metasurface can be portable for use in various scenarios. Further, the metasurface can be configured to operate in a transmission mode, in which incoming signal is passed through the metasurface, or can be reconfigured to operate in a reflection mode, in which incoming signal is reflected by the metasurface. Different phase shifts of the metasurface's unit cells result in array gain through constructive interference, by refraction in the transmission mode, or reflection in the reflection mode. The presence or absence of a removable back plane determines the transmission or reflection operating mode of the metasurface.

A reflector and a method for reflecting electromagnetic waves, the reflector having a support structure having a lateral extension and having an array of tiles, wherein the tiles are sparsely arranged on the support structure to be laterally separated from each other by a separation region of the support structure, wherein each tile has one or more unit cells that each have a reconfigurable intelligent surface, RIS, and a reflector structure that is arranged to laterally overlap at least with the separation region, wherein the reflector structure has a reflective region that laterally overlaps at least with a portion of the separation region and that does not have a reconfigurable intelligent surface.

An intelligent reflecting surface in one embodiment includes a plurality of patch electrodes and a common electrode opposite to the plurality of patch electrodes and a liquid crystal layer between the plurality of patch electrodes and the common electrode, wherein the plurality of patch electrodes has a first patch electrode and a second patch electrode adjacent to the first patch electrode, a first distance between the first patch electrode and the common electrode is shorter than a second distance between the second patch electrode and the common electrode, the first distance is a distance from a first surface of the first patch electrode to a surface opposite the first patch electrode of the common electrode, and the second distance is a distance from a first surface of the second patch electrode to a surface opposite the second patch electrode of the common electrode.

The techniques herein include solutions for enhanced positioning using RIS. A reference signal can be communicated from one transmission reception point (TRP) to another TRP. Either TRP could be a base station or a UE. The reference signal can also be communicated to one or more reconfigurable intelligent surfaces (RISs). As each RIS can apply a different modulation scheme to the reference signal, the receiving TRP can distinguish between reference signals, as well as determine which reference signal came from which RIS. The positioning can be determined based on the different characteristics of the reference signals, using time-difference-of-arrival (TDoA), round-trip-time (RTT), or another type of positioning procedure. These and many other features and examples are discussed herein.

An intelligent reflecting surfaces (IRS) system includes a plurality of reflectors for reflecting or refracting a reception signal according to characteristics thereof, a controller configured to control the characteristics of the plurality of reflectors to either reflect or refract the reception signal in a direction toward an antenna of a mobile device, and a substrate with a front side on which the plurality of reflectors arranged in a predetermined shape and the controller are mounted. The controller is designed to control the characteristics of the plurality of reflectors to maximize an area of the antenna to receive the reception signal, and the substrate is integrated into the mobile device.

The present disclosure provides a measurement and reporting method, device and communication device, which solve the problem of optimal beam information of single hop links in the RIS system or relay system cannot be obtained through relevant technologies. The measurement and reporting method in the embodiment of the present disclosure includes: obtaining, by a first node device, first information, where the first node device is used for transmission with a terminal and/or a network side device; performing, by the first node device, measurement and reporting according to the first information. The first information includes at least one of first measurement and reporting configuration information, first measurement resource configuration information, and first predefined information.

Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, an example of a process includes transmitting, to a reconfigurable intelligent surface (RIS), a plurality of reference signal beams in a plurality of directions. The process may further include receiving, from the RIS, a plurality of reflection reference signal beams in the plurality of directions based on a plurality of backtracking reflection coefficients. The process may include measuring a signal strength of each reflection reference signal beam in each direction of the plurality of directions for each backtracking reflection coefficient of the plurality of backtracking reflection coefficients. The process may further include determining, basing on measuring the signal strength, a selected beam direction from the plurality of directions and a selected backtracking reflection coefficient of the plurality of backtracking reflection coefficients.