Aspects of the present disclosure provide synchronization techniques for user equipment (UEs) that may be otherwise unable to support sidelink communication a synchronized UE and may have also lost global navigation satellite system (GNSS) and/or Evolved Node Base Stations (eNBs) as a synchronization source. In such instance, the unsynchronized UE may utilize reference signals (RS) from the data packets received from other UEs to track the timing and perform autonomous timing adjustments based thereon for synchronized packet transmission or reception.

Disclosed herein are a gateway-signaling method for frequency/timing offsets and an apparatus for the same. An apparatus for transmitting a broadcast signal according to an embodiment of the present invention includes a frequency/timing decision unit for determining a center frequency to which a frequency offset is applied using a carrier offset, which is identified using a timing and a management packet transmitted through a Studio-to-Transmitter Link (STL); and an RF signal generation unit for generating an RF signal to be transmitted, which corresponds to the center frequency.

Aspects described herein relate to communicating a demodulation reference signal (DMRS) corresponding to a downlink control channel, buffering, based on receiving the DMRS, samples of a downlink data channel associated with the downlink control channel, and processing, during on a time period indicated based at least in part on a sequence of the DMRS, at least a portion of the samples of the downlink data channel. Another aspect relates to determining, based at least in part on a sequence of the DMRS, a time offset from the downlink control channel to a downlink data channel, and determining, based at least in part on the time offset, a time period based on which to transmit or start processing samples of the downlink data channel.

An apparatus includes a radio frequency (RF) receiver. The RF receiver includes a timing correlator and frequency offset estimator. The timing correlator and frequency offset estimator: (a) extracts timing from a set of samples derived from an RF signal, and (b) determines a frequency offset estimate from the set of samples.

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.

The present invention provides a method performed by user equipment, and user equipment. The method comprises: acquiring configuration information of a parameter related to generation of an Orthogonal Frequency Division Multiplexing (OFDM) baseband signal of a sidelink physical channel or signal; and generating the OFDM baseband signal of the sidelink physical channel or signal according to the acquired configuration information of the parameter, wherein the parameter comprises a frequency offset determining parameter for determining a frequency offset, so that the OFDM baseband signal of the sidelink, such as an OFDM baseband signal of a 5G sidelink, can be correctly generated.

Carrier frequency offset (CFO) estimation is effected by transmission of contemporaneous bit patterns, detectable by a receiver. By analysis of periodicity of bit error occurrences at the receiver, a beating period caused by interference between the two transmitters can be identified. From this beating period, a measure of CFO can be obtained.

A terminal device comprises a transmitter, a receiver and a controller. The transmitter is configured to transmit a first radio signal to infrastructure equipment of a wireless telecommunications system, the first radio signal being repeatedly transmitted a predetermined number of times during each of a plurality of consecutive time periods, each of the consecutive time periods being separated by a separation time period. The receiver is configured to receive, from the infrastructure equipment during one of the separation time periods, a second radio signal that comprises an indicator indicating that transmission of the first radio signal should continue or that transmission of the first radio signal should be terminated and the second radio signal having a measurable characteristic on the basis of which the terminal device reduces an offset of a reference radio frequency of the terminal device relative to a transmission radio frequency of the infrastructure equipment.

A wireless telecommunications base station that compensates for Doppler shift in each connected User Equipment. The base station deploys a plurality of parallel receivers, each with a given frequency offset above and below the carrier frequency. Each receiver performs a frequency shift on a common uplink signal, determines the quality of the frequency shifted uplink signal, and demodulates the frequency shifted uplink signal. A selector/combiner module generates a highest quality demodulated signal, which may be done by selecting the frequency shifted uplink signal or soft combining a subset of frequency shifted uplink signals having a sufficiently high quality.

Embodiments of the present disclosure provide a wireless communication method, a terminal device, and a network device. The method includes: obtaining configuration information of an uplink gap; and transmitting, based on the configuration information of the uplink gap repeatedly, uplink information on an uplink channel. The uplink gap is used for a terminal device to perform TA pre-compensation or TA adjustment on the uplink gap.