Apparatuses, methods, and systems are disclosed for control information for a digitally controlled surface having reflective elements. One method (1300) includes transmitting (1302), from a first network device, a synchronization signal based on a control frame structure to a second network device including a digitally controlled surface having reflective elements. The method (1300) includes transmitting (1304) control information based on the control frame structure to a controller of the second network device. The control information is transmitted at least partly using a dedicated physical control channel, a sequence, and/or an on-off pattern.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless node may transmit, to a reconfigurable intelligent surface (RIS), a first signal modulated using a first modulation signature, wherein the first modulation signature is an inverted modulation signature associated with a second modulation signature to be applied by the RIS. The first wireless node may receive, from a second wireless node, a second signal indicating that the first signal has been redirected by the RIS and received by the second wireless node. Numerous other aspects are described.

An angular relationship determination method includes: obtaining, at an apparatus, a first phase difference indication corresponding to a first difference in phase between a first signal wirelessly received by a wireless signaling device from a transmitter and a second signal wirelessly received by the wireless signaling device from the transmitter; and determining, at the apparatus, a first angular relationship between the transmitter and the wireless signaling device based on the first phase difference indication, a first virtual focal point location corresponding to the first signal, and a second virtual focal point location corresponding to the second signal, the second virtual focal point location and the first virtual focal point location being different.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The disclosure provides a method performed by a user equipment (UE), the method comprises receiving, from a base station, data in a slot including a first signal transmission section and a second signal transmission section, identifying whether the received data includes a first data in the first signal transmission section for self-interference channel estimation of the base station, in case that the received data includes a first data in the first signal transmission section, decoding the first data using a first transmission scheme for the first signal transmission section, and in case that the data includes a second data in the second signal transmission section, decoding the second data using a second transmission scheme for the second signal transmission section.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) in a vehicle-to-everything (V2X) system may receive configuration information from an assisting node, such as a roadside unit (RSU), for calculating location information for a target UE in the V2X system. The assisting node may reflect one or more radar signals from the UE towards the target, and from the target back towards the UE according to the configuration information. That is, the assisting node may modify one or more waveform parameters of the reflection according to the configuration information. The UE may calculate location information for the target based on the reflection, such as by classifying the target as non-line-of-sight (NLOS) based on modified waveform parameters, location information of the assisting node, or both.

Reconfigurable surfaces and methods for configuring surfaces include measuring properties of one or more incident signals at a configurable cell of a surface. A beam forming pattern for the surface is determined based on the measured properties of the one or more incident signals. Parameters of the configurable cell are set to implement the beam forming pattern in the surface.

An information transmission method and a node device. The method includes: coordinating target information with a second node device; and determining, based on the target information, working information of a third node device; where the target information includes at least one of first information, second information, feedback information for the first information, and feedback information for the second information; the working information includes identification information of the third node device; and the working information further includes at least one of the following: on/off information of switch elements of reflecting or refracting units in the third node device; a working mode of the third node device; phase related information; amplitude related information; polarization related information; and frequency related information.

Methods, systems, and devices for wireless communication are described. In some wireless communications systems, wireless devices may communicate using reconfigurable intelligent surfaces (RIS) for improved spatial diversity. A base station may transmit, to a user equipment (UE), control signaling indicating a configuration for a channel state information (CSI) reference signal (RS) resource set corresponding to one or more RISs and a communication beam threshold for the one or more RISs. The CSI-RS resource set may be specific to one RIS or may configure resources for multiple RISs. The UE may receive, according to the CSI-RS resource set, a set of CSI-RSs corresponding to a set of respective communication beams (e.g., reflected beams from the one or more RISs). The UE may transmit a CSI report indicating one or more communication beams selected by the UE based on the set of CSI-RSs and the communication beam threshold.

Methods, systems, and devices for wireless communications are described. A first wireless device may transmit signaling to an assistive node, and the assistive node may retransmit the signaling to a second wireless device. The assistive node may be configured with a mapping between receive beams and transmit beams at the assistive node. The mapping may enable the assistive node to receive signaling using a receive beam with a first beamwidth and retransmit the signaling using a transmit beam with a second, different beamwidth.

The disclosure relates to a 5th generation (5G) or 6th generation (6G) communication system for supporting higher data transmission rates than 4th generation (4G) communication systems, such as long-term evolution (LTE) systems. A method and a device are provided. The method includes, by a user equipment (UE) in a wireless communication system, receiving RIS information from an RIS controller (RC), identifying an incident beam incident on the UE, providing information about the identified incident beam to the RC and requesting information about candidate RIS modes, receiving the information about the candidate RIS modes, performing probing on the candidate RIS modes, deriving a final RIS mode among the candidate RIS modes using a result of the probing, and transmitting information about the final RIS mode to an RIS through the RC.