Wireless communications are described. A wireless device may be configured to transmit a first signal via a first cell that may overlap in time with a second signal via a second cell. The wireless device may adjust a signal transmission power of at least one of the first signal or the second signal. Additionally or alternatively, the wireless device may drop at least one of the first signal or the second signal. Adjusting and/or dropping at least one of the first signal or the second signal may be based on the overlap in time of these signals satisfying a duration threshold and a total power to transmit the first signal and the second signal exceeding a power threshold.

A radio communication technology that can achieve low latency, high reliability, and low jitter characteristics. A transmitter is configured to duplicate a packet and transmit the duplicated packets. The receiver is configured to receive the duplicated packets. The receiver is configured to transfer, to an upper layer in the receiver, a first packet that is a packet received earlier out of the duplicated packets. A transfer timing that is a timing with which the first packet is transferred to the upper layer includes at least one of: a reception timing of a second packet that is a packet received later than the first packet out of the duplicated packets; and a cyclical timing (Cycle time) corresponding to a transmission cycle of the duplicated packets.

Data transmission methods, apparatuses, base stations, and servers are provided, and relate to the field of the Internet of things. A data transmission method includes determining a system time difference between a first base station and a second base station based on an actual transmission time length of a wireless frame; modifying a sending time of first data according to the system time difference, the sending time of the first data being determined according to a receiving time of second data at the first base station; and sending the first data from the second base station according to the modified sending time of the first data. The present disclosure can reduce the data transmission cost, and improves the reliability of data transmission.

Embodiments provide an information sending method, an information receiving method, a network device, and a terminal device, to enable the terminal device to determine a correct uplink transmission time, thereby avoiding an uplink transmission failure. For achieving this, a network device determines a first receiving start time and a first sending start time. The first receiving start time is a receiving time at which the network device starts to receive a signal in a first time period, and the first sending start time is a sending time at which the network device starts to send a signal in a second time period. The network device sends indication information to a terminal device to instruct the terminal device to determine a second sending start time. The second sending start time is determined based on the first receiving start time and the first sending start time.

A method, system and apparatus are disclosed. In one or more embodiments, a network node configured to communicate with a wireless device (WD) is provided. The network node configured to, and/or including a radio interface and/or including processing circuitry configured to: receive information indicating a timing offset (T′.sub.Δ), determine transmission timing for downlink transmission based on the timing offset (T′.sub.Δ) and at least one estimated timing value, and perform downlink transmission based on the determine transmission timing.

An apparatus comprising a transceiver, an antenna and a processor. The transceiver may be configured to send/receive data messages to/from a plurality of vehicles. The antenna may be configured to receive signals from GNSS satellites. The processor may be configured to (i) determine a first region based on relative coordinates calculated using the data messages, (ii) determine a second region calculated using the signals received from the GNSS satellites, (iii) determine whether a pre-determined amount of the first region to the second region overlap and (iv) increase a confidence level of a positional accuracy of the plurality of vehicles if the pre-determined amount of the first region and the second region overlap. One of the vehicles implements one or more automatic responses based on the confidence level of the positional accuracy.

The present disclosure provides a high-precision time synchronization method. With the method, a traditional time synchronization protocol of a traditional IEEE 1588 network can be improved by introducing a periodic perturbation time between any two nodes in the time synchronization network, the perturbation time can be caused by changing the lengths of transmission paths or introducing clock phase perturbation due to different clock frequencies in the transistor and the receiver. With the method, the relevance of resulting errors of multiple synchronizations can be eliminated, and the perturbation can be compensated by means of statistical averaging, such that the synchronization error due to the low clock resolution of the synchronization node can be decreased. The method may realize the time synchronization at the precision of nanosecond, having significant advantages over the traditional time synchronization method based on IEEE 1588 protocol.

Apparatus and methods are presented for synchronising a slave device signal to a reference timebase, in situations where the slave device lacks knowledge of the propagation delay for signals from the reference device, e.g. if the positions of one or both of the devices are unknown or classified, or the inter-device signal propagation distance is otherwise a-priori unknown. Reference signal propagation delay is determined using an exchange of signals between the devices, with each device using a differencing procedure for eliminating effects of receiver line bias and other hardware delays. In another aspect an exchange of signals between the devices is used to detect a time residual arising from an inaccurate propagation delay estimate. The synchronisation methods can be applied to a plurality of slave devices for providing a synchronised location network. In certain embodiments signals are transmitted wirelessly, while in other embodiments they are transmitted via a fixed line.

Aspects of the present disclosure describe a system and method for synchronizing time, frequency, and phase among a plurality of devices.

Disclosed are techniques for determining round-trip times (RTTs) between a user equipment (UE) and multiple base stations. In an aspect, the UE transmits an RTT measurement signal whose arrival time is measured by each of the base stations, and each of the base stations returns an RTT response signal whose arrival times are measured by the UE. In another aspect, the base stations each transmit an RTT measurement signal and the UE returns an RTT response signal. The receiver of the RTT measurement signal may include the measured arrival time in a payload of the RTT Response signal. Alternatively, the measured arrival time(s) of the RTT Measurement signal(s) and the transmission time(s) of the RTT Response signal(s) are sent in a separate message. The RTT signals can be wideband signals using low reuse resources.