Methods, systems, and devices for wireless communications are described. The method includes a reconfigurable intelligent surface receiving, from a network entity, a synchronization signal block associated with a synchronization signal block index, reflecting the synchronization signal block as a set of multiple instances of the synchronization signal block via a corresponding set of multiple downlink transmit beams, receiving a random access message from a user equipment (UE) during a random access occasion that corresponds with the synchronization signal block index and on an uplink receive beam that corresponds with one of the set of multiple downlink transmit beams, identifying the phase-change pattern of multiple phase-change patterns that corresponds to the uplink receive beam, and reflecting the random access message to the network entity by applying the phase-change pattern to antenna elements of the reconfigurable intelligent surface that reflect the random access message to the network entity.

According to the present disclosure, there are provided methods and devices for utilizing controllable metasurface devices capable of redirecting a wavefront transmitted by a transmitter to a receiver in the wireless network to take advantage of the controllable metasurface device capabilities, intelligence, coordination and speed, and thereby enable solutions having different signaling details and capability requirements.

An electronic device includes a processing circuit configured to: measure the channel quality of multiple beams of a mobile large intelligent surface (LIS) and the channel quality of multiple beams of one or more candidate fixed LISs; and determine a fixed LIS, a service beam of the fixed LIS, and a service beam of the mobile LIS according to a measurement result, so as to provide service for the electronic device by the service beam of the fixed LIS and the service beam of the mobile LIS. According to the electronic device, the wireless communication method, and the computer-readable storage medium of the present disclosure, the advantages of the fixed LIS and the mobile LIS can be combined, and the fixed LIS and the mobile LIS can jointly provide service for a user equipment, so as to improve the communication quality of the user equipment.

Methods, systems, and devices for wireless communications are described. The described techniques provide for beam training a reconfigurable intelligent surface (RIS) for sidelink communications between UEs. A base station may transmit an indication of a resource pool to a receiving UE and a transmitting UE for beam training a RIS. The transmitting UE may identify a resource pattern for training the RIS using the indicated resource pool where the resource pattern is associated with a pattern of beams at the RIS. The transmitting UE may transmit a sidelink reference signal using the identified resource. The receiving UE may receive the reference signal via the RIS according the pattern of beams and transmit a beam report to the transmitting UE. Beam training may be based on a capability of the RIS to use either a different beamformer or a different RIS configuration on different subchannels of the same resource pool.

Methods, devices, and computer-readable media are provided that enable a reconfigurable intelligent surface (RIS) to shape a beam being redirected by the RIS for robustness whether the RIS is integrated at a transmitter, such as a base station or a user equipment (UE), or the RIS is a separate entity from the transmitter. An example method includes beamforming the signal to be transmitted, the beamforming comprising applying beam coefficients to a transmitter. The example method further includes determining configuration information for a reconfigurable intelligent surface (RIS) enabling modification of the signal that impinges on the RIS. The configuration information for the RIS pertains to beam direction, beam shape, and beam robustness of the redirected beam.

This application provides a communication method and a communication apparatus. The method includes: A terminal device obtains first indication information and downlink channel information, where the first indication information indicates a first path domain parameter, the first path domain parameter is a path domain parameter shared by a first uplink channel and a first downlink channel, and the first uplink channel and the first downlink channel are channels for communication between a network device and the terminal device. The terminal device estimates a second path domain parameter based on the first path domain parameter and the downlink channel information, and sends the second path domain parameter to the network device. The first path domain parameter and the second path domain parameter are used by the network device to reconstruct the first downlink channel.

The present disclosure generally relates to a method and a measurement system for characterizing a reconfigurable intelligent surface of a device under test. An incident signal is repeatedly transmitted onto the reconfigurable intelligent surface at an incident angle with respect to the reconfigurable intelligent surface by using a feed antenna. Reflected signals reflected by the reconfigurable intelligent surface are captured by using at least one probe antenna. The reflected signals are captured at different angles of reflection such that a three-dimensional reflection pattern is obtained. A reflected total radiated power for the reconfigurable intelligent surface is determined based on the three-dimensional reflection pattern by using a determination circuit.

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.

Methods, systems, and devices for wireless communication are described. A first wireless communications device may receive, from a second wireless communications device, a signal that is indicative of a phase-change pattern applied to communications between the first wireless communications device and the second wireless communication device by a reconfigurable intelligent surface reflecting the communications. The first device may determine the phase-change pattern from the signal. The first device may transmit a message to the second wireless communications device, wherein at least one of a content or a transmission property of the message is based at least in part on the phase-change pattern.

Some embodiments of the present disclosure provide for a determination, transmission, and reception of lists of visible virtual transmission points. A virtual transmission point is defined based on a signal from a transmission-reception point reflecting off a reflector before arriving at a location in a wireless communication environment. On the basis of the lists and the location of a given device, the transmission-reception point or a device in the environment may reconstruct and track channel subspaces related to a communication. The channel subspaces may relate to angles of departure of signals that reach the given device. The channel subspaces may relate to the angles of arrival of signals that reach the given device.