Method implemented by a device for receiving synchronization data in a device-to-device communication system, said method comprising: receiving a first synchronization signal and a first information associated to a first initial synchronization source, such as the first synchronization signal is either an initial synchronization signal emitted by the first initial synchronization source or a synchronization signal emitted by another device which is synchronized based on the first initial synchronization sources; receiving a second synchronization signal and a second information associated to a second initial synchronization source, such as the second synchronization signal is either an initial synchronization signal emitted by the second initial synchronization source or a synchronization signal emitted by another device which is synchronized based on the second initial synchronization sources.

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.

There is disclosed a method of operating an Integrated Access and Backhaul (IAB) node (200, C, N3) in a radio access network, the IAB node (200, C, N3) being connected to a first parent IAB node (200, N1, P) via a first backhaul link having a first timing, and being connected to a second parent IAB node (200, N2, P) via a second backhaul link having a second timing, the IAB node (200, C, N3) providing a communication link for access or backhaul, the communication link having a communication timing based on the first timing and the second timing. The disclosure also pertains to related methods and devices.

Disclosed are a time delay compensation method and apparatus and a time delay control method and apparatus, which are used for performing time delay compensation on the basis of a relative time delay of a service link and a relative time delay of a feeder link. An uplink timing mechanism for an NTN system is provided, thereby ensuring the reliability of a synchronization establishment process of the NTN system and the timing accuracy of a subsequent data transmission process. Provided is a time delay compensation method, comprising: determining that time delay compensation needs to be performed on a service link and a feeder link in a non-terrestrial networks (NTN) system; and performing time delay compensation on the basis of a relative time delay of the service link and a relative time delay of the feeder link.

A signal divider includes: a dividing circuit arranged to generate an output oscillating signal according to a first input oscillating signal; and a signal generating circuit, coupled to the dividing circuit, for generating an injection signal to the dividing circuit. The dividing circuit is arranged to generate the output oscillating signal with a predetermined phase according to the injection signal and the first input oscillating signal.

Systems and methods are provided for providing blind fast network synchronization for reducing LTE public safety products costs, comprising, in one embodiment: determining if location setup is required to mitigate timing offset due to propagation delay from the synchronization source and adjusting downlink timing, and when location setup is required then providing one of manual setup in terms of timing samples, limited power RACH based on SIB2 parameters, and based on observed time difference of arrival and position reference signal; coordinating network listening periods based on graphs and hash function to avoid common silence for two or more neighboring eNodeBs; and providing continuous synchronization using blind carrier estimation.

One embodiment in the present specification provides a method of performing a measurement by a first device. The method may comprise: a step of transmitting, to a serving cell, capability information with regard to reception of a downlink signal transmitted from the serving cell and a sounding reference signal (SRS) transmitted from a second device; and a step of performing a cross link interference (CLI) measurement on the basis of the SRS from the second device.

Embodiments include methods for downlink (DL) transmission by a network node in an integrated access backhaul (IAB) network. Such methods include receiving, from an upstream node in the network, first timing offset information related to communications between the network node and the upstream node. Such methods include transmitting a DL signal or channel, to one or more downstream nodes, based on a DL transmission timing for the network node. The DL transmission timing is determined from the network node's DL reception timing of signals or channels transmitted by the upstream node and a second function of the first timing offset information, which is determined based on a first function of the first timing offset information (when the first function is greater than a threshold) or on an alternate timing offset (when the first function is not greater than the threshold). Embodiments also include network nodes configured to perform such methods.

Disclosed are methods, systems, apparatus, and computer programs for determining in a new radio (NR) integrated access and backhaul (IAB) system a start symbol of available soft resources of an IAB node. In one aspect, a method includes determining, by a distributed unit (DU) of the IAB node and based on a configuration signal received from a central unit (CU) of an IAB donor, a configuration of available soft resources for a child link of the IAB node. The method further includes determining, based on the configuration of available soft resources, a start symbol of the available soft resources. The method also includes using the available soft resources for one or more child link transmissions starting from the start symbol.

The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data rate, after a 4G communication system such as an LTE system. The present invention relates to a method for guaranteeing a quality of a service in a wireless communication system. Specifically, a method for a base station according to an embodiment of the present invention comprises the steps of: receiving a PRACH from a terminal; identifying a transmission pattern of the PRACH for a symbol group including a plurality of symbols transmitted in a single tone; acquiring information of phase difference between tones, in which the PRACH has been received, according to multiple intervals between symbol groups on the basis of the transmission pattern of the PRACH; estimating a phase offset on the basis of the information of phase difference; and generating uplink timing information for transmission to the terminal, by using a timing offset converted from the estimated phase offset.