Method and apparatus for reporting of time domain channel characteristics. The apparatus receives a Doppler configuration to measure Doppler information for at least one channel path of a plurality of channel paths. The apparatus receives a tracking reference signal (TRS) to obtain the Doppler information for the at least one channel path of the plurality of channel paths based on the Doppler configuration. The apparatus transmits a Doppler report comprising the Doppler information for the at least one channel path of the plurality of channel paths based on the received TRS. The apparatus receives a downlink transmission on a predicted channel and precoder, the predicted channel and the precoder based at least on the Doppler report.

Method and apparatus for reporting of time domain channel characteristics. The apparatus receives a Doppler configuration to measure Doppler information for at least one channel path of a plurality of channel paths. The apparatus receives a tracking reference signal (TRS) to obtain the Doppler information for the at least one channel path of the plurality of channel paths based on the Doppler configuration. The apparatus transmits a Doppler report comprising the Doppler information for the at least one channel path of the plurality of channel paths based on the received TRS. The apparatus receives a downlink transmission on a predicted channel and precoder, the predicted channel and the precoder based at least on the Doppler report.

The technologies described herein are generally directed to detecting reflective surfaces for use reflecting a signal from access point equipment to destination equipment in advanced networks, e.g., at least a fifth generation (5G) network. For example, a method described herein can include receiving a request, from access point equipment, to establish a communications session between the access point equipment and destination equipment. The method can further include based on a source of surface information, predicting that a transient reflective surface is going to be located at a first geographic location and is going to be usable by the access point equipment to reflect a signal to the destination equipment, resulting in reflected path information corresponding to a reflected path for the communications session. Further, the method can include, in response to the request, communicating to the access point equipment, the reflected path information.

Methods, systems, and devices for wireless communications are described. A wireless node (e.g., a vehicle mounted integrated access and backhaul (IAB) node) may aid in wireless communication between one or more wireless devices operating in a high-speed environment (e.g., on a high-speed train (HST)) and one or more network entities. The wireless node may transmit one or more reference signals associated with a Doppler estimation procedure to the one or more network entities. The network entities may use the one or more reference signals to generate a set of Doppler compensation parameters to use while communicating with the wireless node and the one or more wireless devices. In some examples, the wireless node may receive control information or data from the one or more wireless devices, aggregate the information, and transmit the aggregated information to the one or more network entities on behalf of the wireless devices.

Methods, systems, and devices for wireless communications are described. A wireless node (e.g., a vehicle mounted integrated access and backhaul (IAB) node) may aid in wireless communication between one or more wireless devices operating in a high-speed environment (e.g., on a high-speed train (HST)) and one or more network entities. The wireless node may transmit one or more reference signals associated with a Doppler estimation procedure to the one or more network entities. The network entities may use the one or more reference signals to generate a set of Doppler compensation parameters to use while communicating with the wireless node and the one or more wireless devices. In some examples, the wireless node may receive control information or data from the one or more wireless devices, aggregate the information, and transmit the aggregated information to the one or more network entities on behalf of the wireless devices.

Methods and systems for communication and sensing systems. The disclosed method includes, among other things, responsive to receiving a plurality of channel frequency response (CFR) measurements from an antenna operating at a low-bandwidth range, generating a channel state information (CSI) across a high-bandwidth range based on the plurality of CFR measurements and determining, based on the CSI, a Doppler shift across the high-bandwidth range.

Methods and systems for communication and sensing systems. The disclosed method includes, among other things, responsive to receiving a plurality of channel frequency response (CFR) measurements from an antenna operating at a low-bandwidth range, generating a channel state information (CSI) across a high-bandwidth range based on the plurality of CFR measurements and determining, based on the CSI, a Doppler shift across the high-bandwidth range.

A communication method and apparatus are provided. The method includes: A terminal device receives a downlink reference signal from an access network device, and the terminal device sends first indication information to the access network device, where the first indication information indicates at least one Doppler shift, the at least one Doppler shift is determined based on the downlink reference signal, and the at least one Doppler shift is associated with at least two frequency domain bases. According to the foregoing method, the at least one Doppler shift is indicated by using the first indication information, so that there is no need to feed back all Doppler shifts determined based on the downlink reference signal.

A communication method and apparatus are provided. The method includes: A terminal device receives a downlink reference signal from an access network device, and the terminal device sends first indication information to the access network device, where the first indication information indicates at least one Doppler shift, the at least one Doppler shift is determined based on the downlink reference signal, and the at least one Doppler shift is associated with at least two frequency domain bases. According to the foregoing method, the at least one Doppler shift is indicated by using the first indication information, so that there is no need to feed back all Doppler shifts determined based on the downlink reference signal.

A system may include a transmitter node and a receiver node. Each node may include a communications interface including at least one antenna element and a controller operatively coupled to the communications interface, the controller including one or more processors, wherein the controller has information of own node velocity and own node orientation. Each node of the transmitter node and the receiver node may be in motion relative to each other. Each node may be time synchronized to apply Doppler corrections associated with said node's own motions relative to a common reference frame. The common reference frame may be known to the transmitter node and the receiver node prior to the transmitter node transmitting signals to the receiver node and prior to the receiver node receiving the signals from the transmitter node. The receiver node may be configured to be in a state of reduced emissions.