A method of characterizing a communication channel includes receiving a first signal from a set of transmitters reflected along a reflected channel from each element of a reconfigurable intelligent surface (RIS) set at a nominal angle, receiving a second signal reflected in the reflected channel from each element of the RIS set at an adjusted angle, using the first and second signals to determine a transfer function for a combined channel comprised of a reflected channel and a direct channel, and using the transfer function as an input to a machine learning network to determine optimized settings for the elements of the RIS. A communications system includes a set of transmitters, a reconfigurable intelligent surface (RIS), one or more receivers positioned to receive signals reflected by the RIS from the set of transmitters, and a machine learning system configured to produce optimized angles for elements of the RIS.

Methods, systems, and devices for wireless communications are described. A reconfigurable reflective surface may exploit signals transmitted from a user equipment (UE) to communicate feedback to a base station. For example, the surface may communicate feedback by reflecting two or more reference signals according to two or more configurations. In some cases, the two or more configurations may be phase shifted relative each other. In another example, the surface may communicate feedback by altering the intensity of or more reference signals transmitted from the UE. In yet another example, the surface may communicate feedback to the base station by reflecting reference signals towards one or more antenna arrays. In some cases, the one or more antenna arrays may be located at a single base station. In some other cases, the one or more antenna arrays may be located at multiple base stations or multiple transmission/reception points.

The present invention relates to an RF system (100) with a first node (10) and an RF signal diffuser (40). The first node (10) is configured for transmitting an RF signal (30). The RF signal diffuser (40) is configured for reflecting the RF signal (30) in multiple directions in order to generate additional paths (38) for a multipath channel based on the RF signal (30). The RF signal diffuser (40) and the first node (10) are arranged with a distance (50) to each other and are configured such that at least one of the additional paths (38) of the multipath channel has sufficient transmission power for performing RF-based sensing in asensing area (60). The RF system (100) is configured for performing RF-based sensing based on at least two paths (36, 38) of the multipath channel including at least the one of the additional paths (38).

Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) receives, from a location server, positioning reference signal (PRS) configuration information identifying one or more PRS resources transmitted by at least one transmission-reception point (TRP) to be measured by the UE, the PRS configuration information indicating that at least one PRS resource of the one or more PRS resources are reflected by a reflector, and performs one or more positioning measurements of the one or more PRS resources.

Provided are an intelligent surface and a spatial electromagnetic wave manipulation system. The intelligent surface includes M types of electromagnetic units, where M is greater than or equal to 2. The M types of electromagnetic units are distinguished by at least one of the following: the geometric shape of the electromagnetic unit, the manipulation manner of the electromagnetic unit or the type of an electromagnetic parameter manipulated by the electromagnetic unit.

Disclosed is a method performed by a reconfigurable intelligent surface (RIS) device, the method including configuring a number of fixed beams for a beam, a fixed reflection pattern for the beam, and a fixed period for the beam; and reflecting a signal based on the number of the fixed beams, the fixed reflection pattern, and the fixed period, with the fixed reflection pattern being related to an amplitude and a phase of the reflected signal.

A reconfigurable device for influencing spatial properties of an incident radio wave comprises a first sheet having characteristics that vary along a first length direction of the first sheet, the characteristics relating to a first influencing of a spatial propagation of an incident radio wave, and a second sheet having characteristics that vary along a second length direction of the second sheet, the characteristics relating to a second influencing of a spatial propagation of an incident radio wave. A first actuator is coupled to the first sheet and configured to move the first sheet along the first length direction so as to selectively place a section of the first sheet in an exposed area of the reconfigurable device. A second actuator is coupled to the second sheet and configured to move the second sheet along the second length direction so as to selectively place a section of the second sheet in the exposed area. The first sheet and the second sheet are stacked so that a radio wave incident on the exposed area passes through the respective section of the first sheet placed in the exposed area and is incident upon the respective section of the second sheet placed in the exposed area.

Disclosed are techniques for communication. In an aspect, a network component determines location assistance data comprising information associated with one or more reconfigurable intelligent surfaces (RISs). The network component transmits, to a user equipment (UE), the location assistance data to facilitate one or more location procedures based on the location assistance data. The UE receives the location assistance data and performs the one or more location procedures based on the location assistance data.

A transmission processing method, a terminal, and a non-transitory computer readable storage medium are provided. The method includes: determining, by a terminal, a first Physical Random Access Channel (PRACH) transmission occasion. The first PRACH transmission occasion corresponds to analog beams of a wireless auxiliary device. The method further includes sending, by the terminal, a first message Msg1 on the first PRACH transmission occasion.

Disclosed is a method for wireless communication for determining the position of a wireless node. The method comprises receiving a set of reference signals from a set of at least four positioning devices, wherein the positioning devices are not arranged in a single plane. A signal propagation delay of each one of the set of reference signals is determined and a position of each one of the set of positioning devices is obtained. A convex localization problem is solved for the wireless node based at least in part on the determined signal propagation delay of each one of the set of reference signals and the position of each one of the set of positioning devices. The position of the wireless node is determined based at least in part on solving of the convex localization problem.