The network measurement system has a first network measurement device and a second network measurement device respectively having a GNSS receiving function, and with the first network measurement device connected to the UE and the second network measurement device arranged outside the data center and connected to the server device, both devices measure the one-way delay between the UE and the server device. In accordance with this, the second network measurement device simultaneously measures the one-way delay and two-way delay between the server device and estimates the time error of the server device based on the results of the one-way delay and two-way delay measurements.

Embodiments of the present invention provide a reference signal notification method, including: sending, by a network device, a reference signal notification message, where the reference signal notification message includes time resource information of a reference signal. According to the embodiments of the present invention, the reference signal notification message in the present invention is used to notify UE of a reference signal configuration, especially information about a CSI-RS, so that the network device can flexibly provide a reference signal, especially a CSI-RS, and the UE can more effectively receive the reference signal, especially the CSI-RS.

According to an embodiment of the present disclosure, a method for transmitting, by a user equipment (UE), uplink data in a wireless communication system supporting a narrowband Internet of things (NB-IoT) system includes: receiving information related to a preconfigured uplink (UL) resource (PUR) for transmitting the uplink data in an RRC connected state; and transmitting the uplink data by using the preconfigured uplink resource (PUR) in an RRC idle state. In the transmitting of the uplink data, when the preconfigured UL resource (PUR) is a dedicated resource and there is no data to be transmitted in the preconfigured UL resource (PUR), transmission of the uplink data is skipped.

A wireless communication system includes a base station group constituted of four or more base stations 2. One base station 2A measures a reception clock time T.sub.AA of a signal transmitted by itself and a reception clock time T.sub.BA of a signal received from another base station 2B, and the other base station 2B measures a reception clock time T.sub.BB of a signal transmitted by itself and a reception clock time T.sub.AB of a signal received from the one base station 2A. Based on the reception clock time T.sub.AA and the reception clock time T.sub.BA and the reception clock time T.sub.BB and the reception clock time T.sub.AB, a propagation time between the base stations 2 is obtained, and distances between all the base stations 2 are obtained by multiplying each of the propagation times similarly obtained between all the base stations 2 by a propagation velocity of the signals.

Example embodiments generally relate to devices and methods for implementing timing advance alignment between UE and the network for UE autonomous uplink timing advance adjustment at beam change. The UE may be configured to switch from a first beam associated with a first access point to a second beam associated with a second access point, perform autonomous timing adjustment based on a timing difference between a first timing associated with the first access point and a second timing associated with the second access point, and transmit assistant information related to the timing difference to the second access point.

Provided in the present disclosure is a method for sensing synchronization. The method comprises: determining a transmitting time, a transmitting angle, a receiving time and a receiving angle of a plurality of sensing signals; determining a theoretical reflection position of the sensing signal, according to position of a transmitting end, position of a receiving end, the receiving angle of the sensing signal and the transmitting angle of the sensing signal; determining a distance difference of the sensing signal, wherein the distance difference is an absolute value of a difference between a time distance and a position distance of the sensing signal, the time distance is a transmission distance between the time of transmitting the sensing signal and the time of receiving the sensing signal, and the position distance is the sum of a distance between the theoretical reflection position of the sensing signal and the receiving end and a distance between the theoretical reflection position of the sensing signal and the transmitting end; selecting a primary path distance difference from the distance differences; and determining, according to the primary path distance difference, a synchronization error between the transmitting end and the receiving end. Further provided in the present disclosure are a device for sensing synchronization and a computer-readable medium.

A communication device constitutes a management node that manages at least one of a first base station and a second base station provided on fronthaul. The communication device includes an acquisition unit that acquires a delay profile of the second base station, a control unit that determines a window parameter used to specify at least one of a Reception window and a Transmission window used in the first base station based on the delay profile of the second base station and a delay parameter defined by the fronthaul, and a notification unit that notifies the first base station of the window parameter.

According to some embodiments, a method performed by a wireless device capable of operating in a time sensitive network (TSN) comprises obtaining a time synchronization capability of the wireless device and transmitting an indication of the time synchronization capability to a network node. In particular embodiments, the time synchronization capability comprises one or more of a downlink receive tracking accuracy supported by the wireless device, a receive to transmit relative timing accuracy supported by the wireless device, an internal timing accuracy supported by the wireless device, and a propagation delay (PD) compensation method selection capability supported by the wireless device.

A communication system embeds a trust message into an outbound control channel signal derived from a GPS reference signal associated with trunked communications. The trust message is used as a basis for incrementally expanding the subscriber's automatic frequency control (AFC) range beyond its pre-stored default limits to enable re-tuning a temperature compensated crystal oscillator (TCXO) that has drifted off frequency. Coarse-tuning of the subscriber TCXO is based on a measured frequency error of a control channel outbound transmission determined to fall within the expanded AFC range of the subscriber. Additionally, an inbound signal frequency error may be measured by the base station, and reported to the subscriber to use for fine-tuning the TCXO.

This application discloses a clock synchronization method and a device, a storage medium. The method includes: obtaining M first clock offsets, M second clock offsets, and a third clock offset; determining a fourth clock offset based on the M first clock offsets, the M second clock offsets, and the third clock offset; and correcting a clock of a first host based on the fourth clock offset, to implement clock synchronization between the first host and a reference host. In this way, precision of clock synchronization between the first host and the reference host can be further improved, thereby reducing a clock synchronization error.