Disclosed are techniques for communication. In an aspect, a wireless node (e.g., UE or BS) measures a first TOA of a first SRS-P from a UE, a second TOA of a reflection of a second SRS-P from the UE off of a first RIS, and a third TOA of a reflection of a third SRS-P from the UE off of a second RIS. The UE transmits, to a position estimation entity, measurement information based on the first, second and third TOAs. The position estimation entity determines a positioning estimate of the UE based at least in part on the measurement information.

Methods and apparatuses for power control schemes for active RIS are disclosed. In one embodiment, a base unit comprises a processor; and a transceiver coupled to the processor, wherein, the processor is configured to transmit, via the transceiver. a message to enable an active RIS.

A method for sending a phase shift configuration of an intelligent reflecting surface (IRS), performed by a network device, includes: receiving a pilot signal sent by a terminal; performing a decorrelation processing on the pilot signal; obtaining an initial reflection phase shift vector by inputting a decorrelated pilot signal into a first network model; obtaining a reflection phase shift vector to be configured by inputting the initial reflection phase shift vector into a second network model, wherein a scale of the reflection phase shift vector to be configured is smaller than a scale of the initial reflection phase shift vector; and sending the reflection phase shift vector to be configured to the IRS.

Provided in the embodiments of the present application are a beam management method, a beam configuration method, an access node, a relay device, and a storage medium. The beam management method comprises: grouping a plurality of relay devices according to a preset grouping rule, and forming at least one beam management group (S1000); and performing, with each group as a unit, beam management on the relay devices in each beam management group (S2000).

In an aspect, a wireless node may transmit one or more messages to a reconfigurable intelligence surface (RIS), the one or more messages indicating a sensing beam sweeping mode for a sensing operation, an incident angle of a forward path of the sensing operation with respect to the RIS, a redirected angle of the forward path of the sensing operation with respect to the RIS, or any combination thereof. The wireless node may transmit a sensing signal for the sensing operation to the RIS, the RIS being configured based on the sensing beam sweeping mode, the incident angle of the forward path, the redirected angle of the forward path, or any combination thereof.

A method for precoding based on a reconfigurable intelligence surface (RIS), performed by a first network device, includes: obtaining unit arrangement information and block information of a second network device, where the block information indicates a plurality of blocks of the second network device; receiving channel feedback information sent by a terminal, where the channel feedback information is determined by the terminal according to a reference signal sent from each block of the second network device; determining first indication information according to the channel feedback information, the unit arrangement information and the block information, where the first indication information is used to determine a phase shift matrix for the second network device; and sending the first indication information to the second network device.

Methods, systems, and devices for wireless communications are described in which a transmitting device may transmit a set of reference signals to a receiver via a configurable surface such as a reconfigurable intelligent surface (RIS). The RIS may randomly adjust one or more parameters for one or multiple RIS elements to provide different beamformed parameters for reflected instances of each reference signal from the RIS. Each reference signal may have a corresponding reference signal index value, and the receiver may provide an indication of a selected the reference signal index value based on channel measurements of the reference signals. The transmitting device may provide an indication to the RIS of the index value, and may communicate with the receiver based on the selected reference signal via the RIS, where the RIS uses the parameters associated with the RIS index value for the communications.

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.

A generating method and a generating system of a wideband reconfigurable intelligent surface are proposed. The generating method includes executing an electromagnetic simulation software to generate a plurality of reconfigurable reflective units, and simulating the reconfigurable reflective units to obtain a plurality of reflection characteristic simulation values corresponding to a plurality of metal patterns; calculating the reflection characteristic simulation values according to an adaptability function to obtain a plurality of adaptability values corresponding to the metal patterns; calculating the adaptability values according to an optimization algorithm to obtain an optimized adaptability value, wherein the optimal adaptability value corresponds to an optimized metal pattern data; and importing the optimized metal pattern data into the electromagnetic simulation software to generate a plurality of optimized reconfigurable reflective units and forming the wideband reconfigurable intelligent surface based on the optimized reconfigurable reflective units.

A communication method and a communication apparatus are provided. The method includes: a terminal device obtains a channel measurement result, wherein the channel measurement result is obtained by the terminal device based on at least two reflections by an antenna element set of an intelligent reflecting surface for a first signal sent by a network device, the first signal is a signal for channel measurement, and the antenna element set includes at least two antenna elements; and the terminal device determines a path difference between the antenna elements of the intelligent reflecting surface based on the channel measurement result.