Various solutions for timing and frequency synchronization in non-terrestrial network (NTN) communications with respect to user equipment and network nodes are described. An apparatus may receive a reference time signaled by a network node. The apparatus may measure a received time of a downlink message from the network node. The apparatus may estimate a propagation delay according to the reference time and the received time. The apparatus may perform a timing pre-compensation according to the propagation delay.

This disclosure provides systems, methods and apparatus for wireless communication. In one aspect, a user equipment (UE) may generate an indication of a first doppler shift associated with the wireless communication device moving with reference to a first target base station (BS), obtain, from the serving BS, a handover command for conditional handover (CHO) (with the handover command including a first trigger for handover to the first target BS), and synchronize with the first target BS during CHO after the first trigger is met, wherein the first trigger is associated with the first doppler shift. In another aspect, a serving BS generates the handover command for CHO and provides the handover command to the UE. The UE is to synchronize with the first target BS during CHO after the first trigger associated with a first doppler shift is met.

A first signal generated from a signal generator may be synchronized with a local clock of a first device at a first time, and sent to a second device, the first signal having a first frequency. A second signal generated from the signal generator may be further synchronized with the local clock of the first device at a second time, the second signal having a second frequency different from the first frequency, and a difference between the second time and the first time being within a predetermined range of a predetermined time difference. The second signal may then be sent to the second device to enable the second device to determine a distance between the first device and the second device based at least in part on a phase difference between the first signal and the second signal.

Embodiments of the present disclosure relate to wireless communication field and disclose a method for speed measurement and positioning and a terminal. The speed measurement and positioning method in the present disclosure applied to a receiving end comprises: when it is determined that the local oscillation frequency of the receiving end is the same as that of each transmitting end, receiving a test signal transmitted by at least one transmitting end; determining frequency difference between the frequency of the test signal and the local oscillation frequency of the receiving end; determining, according to the frequency difference, the relative speed between the receiving end and the transmitting end corresponding to the test signal; and determining, according to the determined relative speed and first position information of the transmitting end corresponding to the test signal, second position information of the receiving end relative to the transmitting end corresponding to the test signal.

A cloud radio access network (C-RAN) includes a baseband controller communicatively coupled to a plurality of radio points (RP) via a fronthaul network. Each of the plurality of RPs are configured to exchange radio frequency (RF) signals with at least one user equipment (UE). At least one of the RPs is configured to determine a timing difference while synchronizing to the baseband controller; and determine a frequency error, between the RP and a neighboring base station, based on a radio environment monitoring (REM) procedure. A phase error is determined, between the baseband controller and the neighboring base station, phase error is determined based on the timing difference for the RP and baseband controller, and the frequency error for the RP and the neighboring base station.

A signaling-type method for mobile phone signals, comprising: establishing a shielding processing system, and ensuring that the frequency reference of said system is synchronized with that of a base station; using the feature that a frame signal of a base station is repeatedly transmitted according to a frame period of the base station, receiving the frame signal of the base station at different times; performing filtering processing on the frame signals of the base station using a frame averaging method, so as to obtain purified frame reference signals of the base station; and using the purified frame reference signals to shield the base station.

A method, device and computer readable medium for performing measurements in telecommunication systems are disclosed. The method includes receiving, from a first network device, a first configuration of a first measurement object for a carrier frequency; receiving, from a second network device, a second configuration of a second measurement object for the carrier frequency; determining an absolute time difference between a first measurement timing in the first configuration and a second measurement timing in the second configuration; and in response to determining that the absolute time difference is below a predetermined threshold, performing a single measurement for the carrier frequency based on the first measurement timing in the first configuration or the second measurement timing in the second configuration.

Methods and systems for managing data transmissions are disclosed. An example method can comprise determining a plurality of time allocations for a time cycle. The plurality of time allocations can comprise a first time allocation which can be determined based on an information rate, a committed information rate, an excess information rate, an effective bandwidth rate, other factors, or a combination thereof. Data can be received from multiple sources into a buffer, for example, and can be processed within a time cycle if processing the data will not exceed the time allocation.

System and method for adjusting timing error in a mobile device. In the mobile device, a crystal oscillator (XO) is used by a system timer as the timing source. When the mobile device enters into a sleep mode, the system timer is set to time the duration of the sleep mode. During the sleep mode, a thermistor is used to measure and monitor the temperature changes of the XO. After the sleep mode is over, a processor in the mobile device determines the frequency changes of the XO based on the temperature changes of the XO. Based on the frequency changes of the XO, the processor determines the timing error that may have occurred when the system timer was timing the sleep mode and determines the actual duration of the sleep mode by adjusting the duration timed by the system timer based on the timing error.

An electronic clock which is a communication device includes: a transceiver configured to communicate with another communication device including first software and second software; and at least one processor. The processor: controls the transceiver to perform a certain communication with the first software; and causes, after the certain communication ends, the transceiver to transmit a notification for notifying the second software of the end of the certain communication.