Systems and methods for one-way time transfer using physical layer signaling are disclosed herein. According to some examples, a method includes generating timing information based on a clock of a transmitting device, where the timing information comprises a timestamp and metadata. The method further includes generating a preamble of a frame, where the preamble includes the timestamp and the metadata of the timing information. The method also includes forming a frame, where the frame comprises a bootstrap, the preamble, and a payload, and transmitting the frame to a receiver device. The one-way time transfer systems and methods of this disclosure can serve mobile devices that entail quick and reliable establishment of a clock.

In busy 5G and 6G networks, precise timing and synchronization are key to maintaining throughput with low fault rates. Disclosed are systems and methods for adjusting each user device's clock for proper reception, including downlink propagation delays, uplink propagation delays, round-trip propagation delays, and Doppler shifts, individually for each user device, and including any uplink/downlink asymmetries. The clock adjustment and timing advance of each user device is based on a predetermined transmission schedule for timing signals, broadcast by the base station. The Doppler shift is measured by the base station, according to uplink timing signals, and communicated to the user device in a single final timing signal. The single final timing signal is either frequency-shifted by the measured Doppler shift, or delayed proportional to the Doppler shift, either of which indicates, to the user device, how to apply the correct timing to future uplink messages.

Methods, apparatuses, and systems are described for wireless communications. Cells may be grouped into a plurality of cell groups. Control message(s) may be transmitted to a wireless device for the wireless device to transmit a preamble via a secondary cell.

A method for processing very-high-speed random access includes: selecting a Zadoff-Chu (ZC) sequence group according to a cell type and a first cyclic shift parameter Ncs, and setting N detection windows for each ZC sequence in the ZC sequence group, where N5; sending the cell type, a second Ncs, and the ZC sequence group to a user equipment (UE); receiving a random access signal sent by the UE, and obtaining the random access sequence from the random access signal; performing correlation processing on the random access sequence with each ZC sequence in the ZC sequence group, detecting a valid peak value in the N detection windows of each ZC sequence, and determining an estimated value of a round trip delay (RTD) according to the valid peak value, so that a UE in a very-high-speed scenario can normally access a network, thereby improving network access performance.

A method and apparatus for transmitting or detecting primary synchronization signal. The receiver receives primary synchronization signal from a transmitter, and detects the sequence used in the received primary synchronization signal by using three root indexes. Here, the primary synchronization signal is generated by using a Zadoff-Chu sequence having one of the three root indexes. The three root indexes comprise a first index and a second index, and a sum of the first index and the second index corresponds to the length of the Zadoff-Chu sequence.

A method is performed by a wireless node in a wireless communication network for receiving a reference signal. The method includes collecting a first set of samples of the received signal in time domain, transforming the first set of samples into frequency domain, forming a plurality of hypotheses including a set of hypotheses for time offset of the received signal and/or a set of hypotheses for frequency offset of the received signal, correlating the frequency domain samples of the received signal with at least a subset of the plurality of hypotheses, and selecting a hypothesis based on the correlation, wherein the selected hypothesis corresponds to a synchronisation of the received signal such that the synchronisation is achieved. A wireless communication device, a network node, and computer programs for implementing the method are also described.

A method of user equipment (UE) for system information transmission in a wireless communication system is provided. The method comprises receiving, from a base station (BS), a synchronization signal/physical broadcasting channel (SS/PBCH) block comprising a PBCH that carries a master information block (MIB) including an SIB1 CORESET configuration, wherein the SIB1 CORESET configuration comprises a frequency location, a number of resource blocks (RBs) comprising an SIB1 CORESET associated with the SS/PBCH block, and information of time domain resources of the SIB1 CORESET, determining an initial active bandwidth part (BWP) comprising the frequency location, the number of RBs comprising the SIB1 CORESET, and a numerology of remaining minimum system information (RMSI), and receiving, from the BS, a physical downlink control channel (PDCCH) mapped to at least one time-frequency resource within the SIB1 CORESET, wherein the PDCCH includes scheduling information of a physical downlink shared channel (PDSCH) containing an SIB 1.

The disclosure provides a network access method and a user equipment (UE) using the same method in an environment of a 5G communication system. In an exemplary embodiment in accordance with the disclosure, the disclosure is directed to a network access method for a UE. The method would include not limited to: receiving a Synchronization Signal/physical broadcast channel Block (SSB) which comprises at least one of a physical broadcast channel (PBCH), a primary synchronization signal (PSS), a secondary synchronization signal (SSS) or mapping information; and determining from the SSB at least one of a SSB candidate number, a SSB index or a SSB pattern.

A method for converting a conventional cellular network e.g. having nodes equipped with conventional modems operating in accordance with a cellular communication protocol e.g. LTE and storing first orthogonal sequences, into a private cellular network, including coupling an (e.g. external) device to only nodes sought for the private cellular network, the device storing second orthogonal sequences not hard-coded in the modems, the device storing a one-to-one correspondence enabling translation of each second orthogonal sequence, to one of the first sequences. at least when in a private network supporting mode, a device associated with a transmitting node sought for the private network, uses a processor to determine which first orthogonal sequence is being used, translate that sequence using the one-to-one correspondence into a second orthogonal sequence, and use the translated sequence to transmit a synchronization signal.

Systems and methods for one-way time transfer using physical layer signaling are disclosed herein. According to some examples, a method includes generating timing information based on a clock of a transmitting device, where the timing information comprises a timestamp and metadata. The method further includes generating a preamble of a frame, where the preamble includes the timestamp and the metadata of the timing information. The method also includes forming a frame, where the frame comprises a bootstrap, the preamble, and a payload, and transmitting the frame to a receiver device. The one-way time transfer systems and methods of this disclosure can serve mobile devices that entail quick and reliable establishment of a clock.