A method of controlling transmission of a wireless signal in a wireless telecommunications network including a transmitting node, a receiving node, and an Intelligent Reflective Surface (IRS), the transmitting node including a processor operating a first neural network that inputs an input bit sequence and outputs the wireless signal and a transmitter to transmit the wireless signal output by the first neural network, the IRS includes a reflective surface for reflecting the wireless signal transmitted by the transmitter and further includes a processor for applying a phase change to the wireless signal according to a phase shift matrix, and the receiving node includes a receiver for receiving an accumulated wireless signal transmitted by the transmitter and reflected off the reflective surface and a processor operating a second neural network that inputs the received accumulated wireless signal and outputs an output bit sequence.

According to an aspect, there is provided an apparatus for performing the following. The apparatus maintains, in at least one memory, information on a reference incidence direction and reference configuration information defining a plurality of configurations of a plurality of tunable load impedance circuits of a tunable reflective array of a reconfigurable intelligent surface or a subpanel thereof for the reference incidence direction. The apparatus measures an incidence direction from which electromagnetic waves are received by the reconfigurable intelligent surface. The apparatus calculates, based on the reference incidence direction, the measured incidence direction and the reference configuration information, corrected configuration information defining a plurality of corrected configurations for the measured incidence direction. Finally, the apparatus configures the plurality of tunable load impedance circuits according to a corrected configuration.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitting device (405) selects an indication of a seed to be used by a forwarding device (350), such as a passive device with a reconfigurable intelligent surface, to generate a configuration for reflecting or forwarding signals. The transmitting device transmits the indication of the seed to the forwarding device (605). The transmitting device transmits the signals (625) to a receiving device via the forwarding device. The transmitting device receives measurements of the signals (630). Numerous other aspects are described.

A configuration for clustering of reconfigurable intelligent surface (RIS) elements. The apparatus receives, from an RIS controller, a cluster configuration of a RIS comprising a plurality of clusters. The apparatus performs a beam training procedure on the plurality of clusters of the RIS. The beam training procedure including transmission of a sequence of a plurality of reference signals to each cluster of the plurality of clusters. The apparatus transmits, to a base station, a feedback indication indicating an optimal configuration for each cluster of the plurality of clusters based at least on the beam training procedure. The apparatus receives a downlink signal reflected by a set or group of clusters of RIS from the base station.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may transmit, to a second UE via reflection by one or more passive devices, a first reference signal (RS) that is based at least in part on a shared first key that corresponds to a configuration of the one or more passive devices. The first UE may receive, from the second UE via reflection, a second RS that is based at least in part on the first key. The first UE may generate a second key based at least in part on a measurement of the second RS. The first UE may transmit a positioning reference signal that is based at least in part on the second key and that is associated with a measurement of a range between the first UE and the second UE. Numerous other aspects are described.

A communication system may include an access point (AP), a user equipment (UE), and a communication path between the AP and the UE having a series of reconfigurable intelligent surfaces (RIS's). Each RIS may have a first beam pointing to a previous node and a second beam pointing to a next node in the communication path. Beams of routing RIS's and a beam from an end user RIS towards a last routing RIS may be set during calibration. The UE may perform beam discovery with the end user RIS. The UE and the AP may convey wireless data via reflections off each of the RIS's in the communication path. The beam of the end user RIS may be updated to track the UE device while the other the beams remain fixed. The beams may be calibrated using retroreflection and beam variation for each pair of RIS's up the communication path.

The disclosure relates to a method and device for a channel state information (CSI) report including beam information in a wireless communication system supporting an RIS. A method performed by a BS in a wireless communication system supporting an RIS includes configuring a CSI-RS group based on at least one of an RIS reflection pattern to be applied to an RIS device or a transmission beam of the BS, transmitting, to a UE, configuration information for a CSI report related to a transmission beam for the BS to transmit a CSI-RS to the UE based on the configured CSI-RS group, and receiving a CSI report related to the transmission beam from the UE receiving the CSI-RS for each CSI-RS group.

In aspects, a base station determines to transmit a multi-user-equipment communication, multi-UE communication, to multiple user equipments, UEs. The base station determines to include an adaptive phase-changing device, APD, in a communication path for a wireless signal carrying the multi-UE communication and selects a surface configuration for a surface of the APD based on determining to transmit the multi-UE communication. The base station directs the APD to apply the surface configuration to the surface and transmits the wireless signal carrying the multi-UE communication by transmitting the wireless signal towards the surface of the APD.

A relay device relays a predetermined signal transmitted by a base station device through a predetermined beam by outputting the predetermined signal in a plurality of radio wave output directions without decoding user data, performs control such that the predetermined signal transmitted through the predetermined beam in a first time slot is relayed in a first direction among the plurality of radio wave output directions, and the predetermined signal transmitted through the predetermined beam in a second time slot is relayed in a second direction among the plurality of radio wave output directions, and selects an output direction, among the plurality of radio wave output directions, in which to output a radio wave in signal transmission between a terminal device and the relay device, based on a timing at which a second predetermined signal is received from the terminal device.

Certain aspects of the present disclosure provide techniques for user equipment (UE) positioning using one or more intelligent reflecting surfaces (IRSs). A method that may be performed by a UE includes for each IRS of the one or more IRSs: identifying a first IRS reflection center, measuring a first impulse response from the IRS to obtain a first measured impulse response representation, determining a first impulse response for a first ray reflected from the first IRS reflection center of the IRS, estimating a first position of the UE based on, at least, the first IRS reflection centers for each of the one or more IRSs and the first impulse responses for each of the one or more IRSs, and estimating a second position of the UE in an iterative manner until one or more conditions are satisfied.