A method includes receiving a current velocity and a current position of a mobile node relative to a fixed node. The method also includes identifying a receive time slot for the fixed node to receive a transmission of a data packet from the mobile node and determining a propagation delay for the data packet between the mobile node and the fixed node based on the current position of the mobile node. The method includes determining a transmission time based on the receive time slot and the propagation delay and determining a Doppler shift based on the current velocity of the mobile node. The method includes determining a transmission frequency based on the Doppler shift and a clock rate correction. The method also includes transmitting the data packet to the fixed node at the determined transmission time using the determined transmission frequency compensated by the determined clock rate correction.

Doppler pre-compensation is performed on synchronization signals using each of multiple Doppler pre-compensation patterns to generate a plurality of sets of Doppler pre-compensated synchronization signals that are transmitted using one or more beams. A signal indicating the Doppler pre-compensation patterns used is transmitted in one of a system information block (SIB) or a radio resource control (RRC) reconfiguration message, in connection with initial access by a user equipment (UE), idle UE cell reselection, connected UE data channel reception, or UE handover. The signal indicates Doppler pre-compensation patterns for a transmitting cell and Doppler pre-compensation patterns for one or more neighbor cells. The synchronization signal comprises a synchronization signal block (SSB) including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). Received Doppler pre-compensated synchronization signals are combined in the time domain in connection with timing synchronization detection, frequency offset (FO) estimation, or reference signal received power (RSRP) measurement.

A clocked electronic device, such as a wireless magnetic resonance (MR) receive coil (20), comprises a wireless receiver or transceiver (30) configured to receive a propagation-delayed wireless clock synchronization signal (54) comprising first and second propagation-delayed carrier signals at respective first and second carrier frequencies separated by a frequency difference, a clock (60) comprising a local oscillator (62) driving a digital counter (64), and at least one electronic signal processing component (66) configured to perform clock synchronization. This includes determining a wrap count (k) from a phase difference (φ.sub.1) between phases of the first and second propagation-delayed carrier signals, unwrapping a wrapped phase (φ.sub.2,wrapped) of the propagation-delayed wireless clock synchronization signal using the wrap count to generate an unwrapped phase (φ.sub.2,wrapped), and synchronizing the clock using the unwrapped phase.

A terminal apparatus receives a parameter that is configured by a network apparatus and that is used to calculate an update period, where the update period is used to indicate time at which the terminal apparatus receives an uplink time-frequency synchronization parameter. The terminal apparatus receives an updated uplink time-frequency synchronization parameter based on the update period. The network apparatus configures the parameter for calculating the update period, so that the terminal apparatus can update the uplink time-frequency synchronization parameter in time.

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. Each node may be time synchronized to apply Doppler corrections to said node's own motions relative to a stationary common inertial reference frame. The stationary common inertial 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.

An apparatus is described, comprising circuitry to obtain base station location information for a plurality of base stations that provide a wireless network for communication with a moving vehicle, the plurality of base stations comprising a current base station and one or more other base stations, circuitry to obtain moving vehicle tracking information for the moving vehicle, circuitry to determine, based on the moving vehicle tracking information and the base station location information, transmission adjustment control information associated with each other base station, and an interface configured to transmit, for reception by the moving vehicle, the transmission adjustment control information associated with at least a selected other base station, to enable the moving vehicle to adjust a signal transmitted to the selected other base station when a handover procedure is performed to transition communication with the moving vehicle from the current base station to the selected other base station.

Systems and methods relating to correction of a Doppler/frequency offset in a wireless communication system are disclosed. In some embodiments, a method of operation of a node comprises estimating a Doppler/frequency offset for a wireless device based on an uplink signal received from the wireless device and providing a frequency adjustment to the wireless device that corrects for the Doppler/frequency offset. In this manner, the Doppler/frequency offset for a wireless device is determined and corrected.

High-frequency communications in 5G and especially 6G will require precise synchronization of user devices with the base station, including setting the user device clock time and clock rate. The base station can assist user devices by periodically providing a guard-space timestamp point, at which a phase or amplitude of the timing signal abruptly changes in the middle of the guard-space of a particular resource element or a particular OFDM symbol. A receiver can determine precisely the time of arrival of the timestamp point, and correct its clock setting to agree with the time of the timestamp point. The receiver can then provide uplink messages aligned with the base station's clock, by adding a previously determined timing advance to each uplink transmission. In addition, the user device can measure two guard-space timing signals with a predetermined separation, thereby adjusting the clock rate.

Various aspects of the disclosure relate to use of a default communication configuration for cross carrier wireless communication. For example, a wireless communication device such as a user equipment (UE) may use a default communication configuration that includes quasi-colocation information (e.g., a default CORESET configuration) for communication on a secondary component carrier (SCC). The default communication configuration may be used, for example, in scenarios where a CORESET is not defined for the SCC and other configuration information is not available. For example, other configuration information might not be available due to a short time gap between a grant sent on a primary component carrier (PCC) and the communication on the SCC scheduled by the grant.

Example frequency compensation methods and apparatus are described. One example method includes determining first information and sending the first information by a network device to a terminal device, where the first information indicates a frequency compensation manner of an uplink signal of the terminal device or the first information indicates a configuration parameter of the terminal device. The terminal device receives the first information, and determines, based on the first information, the frequency compensation manner to be used to send the uplink signal. The terminal device performs frequency compensation for the uplink signal based on the frequency compensation manner.