Disclosed are techniques for wireless sensing. In an aspect, a method for reconfigurable intelligent surface (RIS)-assisted sensing performed by a base station (BS) includes configuring one or more reciprocal RIS beam pairs for sensing, wherein each of the one or more reciprocal RIS beam pairs comprises a downlink (DL) beam having a DL angle of departure (DL AoD) from a RIS controlled by a first set of control voltages and an uplink (UL) beam having an UL AoD from the RIS controlled by a second set of control voltages. The BS may send, to the RIS, information identifying the one or more reciprocal RIS beam pairs. The BS may perform monostatic sensing using at least one of the one or more reciprocal RIS beam pairs.

Methods, systems, and devices for wireless communications are described. During an operation for discovering reconfigurable surfaces, a sensing signal may be transmitted. Based on the sensing signal being transmitted, another signal may be detected at the device that transmitted the sensing signal, another device, or both. The device that detects the signal may combine the detected signal with a modulation sequence that is associated with a reconfigurable surface, where the reconfigurable surface may be assigned a set of unique modulation sequences and configured to apply a modulation sequence to received signals. Based on combining the detected signal with the modulation sequence, the device may determine whether the reconfigurable surface is present within a geographic region.

Aspects of the present disclosure provide methods and devices that facilitate two-way redirection via a reconfigurable intelligent surface (RIS) when beam correspondence does not hold. A first embodiment includes using a wide-beam redirection via RIS in which the RIS is configured to redirect the beam incident on the RIS in either direction such that the redirected beam can encompass the deviation of the redirected direction and still reach the destination. A second embodiment includes partitioning the RIS, or using multiple different RISs, where each part, or different RIS, is configured for each direction of communication. A third embodiment includes using time division-duplexing (TDD) such that the RIS is configured to transmit in one direction at a time.

An operating parameter configuration method includes receiving, by an intelligent signal amplifier, a first broadcast message from a network side device, where the first broadcast message is configured to indicate that the intelligent signal amplifier is supported to access the network side device; initiating, by the intelligent signal amplifier, target random access based on the first broadcast information; and receiving, by the intelligent signal amplifier, an operating parameter from the network side device after the target random access is successful, where the target random access includes 2-step random access or 4-step random access.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an indication of a classification of a link established between the UE and a network node. The classification may indicate whether the link is associated with a reciprocity. The reciprocity may include a beam correspondence and channel reciprocity. The classification of the link may be a binary classification. The classification of the link may be based at least in part on a metric associated with the link. The link may be associated with the reciprocity depending on one or more link characteristics associated with the link. Numerous other aspects are described.

A beam control method for the intelligent surface device includes obtaining, by a network side device, first channel information of an active unit of the intelligent surface device, where the first channel information is channel information between the network side device and the active unit; obtaining second channel information of the active unit, where the second channel information is channel information between a terminal and the active unit; and determining control information of a unit array of the intelligent surface device based on the first channel information and the second channel information, where the unit array includes the active unit and a passive unit of the intelligent surface device.

A method includes acquiring multiple pieces of first received signal quality information at a receiver, where the multiple pieces of first received signal quality information represent qualities of signals received at the receiver, generating first conditional sample statistical values based on the multiple pieces of first received signal quality information and phase shift arrays corresponding to the signals, determining the first phase shift array that meets a communication requirement according to the first conditional sample statistical values, where the first phase shift array includes the phase shift value for at least one reflective element of an IRS, and configuring the IRS based on the first phase shift array.

Techniques and apparatuses are described for adaptive phase-changing device power-saving operations. In aspects, a base station determines to transition an adaptive phase-changing device (APD) into an enabled APD-PS mode and determines an APD-PS configuration for the APD that specifies a framework for operating in the enabled APD-PS mode. The base station then directs the APD to operate in the enabled APD-PS mode by communicating the APD-PS configuration to the APD and transmits or receives wireless signals using a surface of the APD and based on the APD-PS configuration.

The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as LTE. The disclosure provides a method performed by a UE. The method includes receiving mapping information between a combination of a reflection pattern and a transmission beam of a BS and an RS from the BS; receiving scheduling information including information on a channel state corresponding to the combination of the reflection pattern and the transmission beam of the BS; identifying a reception beam based on at least one RS received from the BS, the mapping information, and the scheduling information; and receiving a downlink signal from the BS through the reception beam. The reflection pattern is related to an RIS.

A method for shaping a mmWave wireless channel in a wireless network is presented. The method includes enabling communication between a multi-antenna transmitter and a multi-antenna receiver, positioning a reconfigurable intelligent surface (RIS) in a vicinity of the multi-antenna transmitter and the multi-antenna receiver, constructing the RIS as a uniform planar array (UPA) structure forming a multi-beamforming framework, a surface of the UPA defining an array of discrete elements arranged in a grid pattern, wherein parameters of the discrete elements of the UPA are controllable to achieve multiple disjoint beams covering different solid angles, and enabling the plurality of users of the plurality of mobile devices positioned in blind spots of a coverage map to communicate with the multi-antenna transmitter by employing the MS to generate sharp and effective beams having almost uniform gain in a desired angular coverage interval (ACI).