Disclosed is a method and apparatus for transmitting and receiving a synchronization signal and a transmission system. In the method, a transmitting node determines a frequency band range in which a carrier is located, and configures or assumes synchronization channel information on the carrier according to the frequency band range, where the synchronization channel information includes at least one of: a subcarrier spacing or orthogonal frequency division multiplexing (OFDM) symbol information of a synchronization channel; and the transmitting node transmits the synchronization signal using the synchronization channel information.

The present disclosure relates to a pre-5.sup.th-Generation (5G) or 5G communication system that supports higher data rates beyond 4.sup.th-Generation (4G) communication systems. In particular, one or more embodiments relate to methods and systems for performing cell search in a millimeter wave (mmWave) based communication network. A method disclosed herein includes selecting a subset of receive (Rx) beams from a plurality of Rx beams and scheduling a scan order for the selected subset of Rx beams, upon receiving a plurality of signals from a Base Station. The method also includes performing a cell search using the selected subset of Rx beams individually in the determined scan order. The method further includes combining two or more of the selected Rx beams, upon failing the cell search using the selected subset of Rx beams individually. The method further includes performing the cell search using the combined Rx beams.

The present disclosure discloses a method of receiving a synchronization signal block by a user equipment (UE) in a wireless communication system. The method includes receiving, in one of two half frames included in a frame, a synchronization signal block including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and receiving a demodulation reference signal (DMRS) in a resource region carrying the PBCH. Information about the half frame in which the synchronization signal block is received may be obtained from a sequence of the DMRS.

The present disclosure relates to channel transmission methods, base stations, and terminal devices. One example method includes receiving a first channel from a network device, determining a frame structure used between the network device and a terminal device according to relationship between a transmission parameter set of the first channel and the frame structure, and communicating with the network device according to the frame structure.

One disclosure of this specification provides a method for receiving a synchronization signal block (SSB) by a user equipment (UE). The method may include: determining frequency locations of multiple SSBs; and receiving at least one SSB among the multiple SSBs. The multiple SSBs may be configured to be arranged spaced apart from each other by a predetermined offset. The at least one SSB may be located at an interval of 1.2 MHz on a frequency axis.

A set of neighboring base stations coordinate to transmit a cell-specific common resynchronization signal via a Common Synchronization Channel (CSCH). At least one neighboring base station transmits the cell-specific common resynchronization signal by a timing advance value before a serving base station transmits the cell-specific common resynchronization signal. A user equipment (UE) device receives the cell-specific common resynchronization signals from the base stations and combines the received cell-specific common resynchronization signals. In some examples, the UE device coherently combines the received cell-specific common resynchronization signals. Once the received signal strength of the combined received cell-specific common resynchronization signals exceeds a threshold level, the UE device utilizes the combined received cell-specific common resynchronization signals to obtain resynchronization.

The present disclosure relates to the field of wireless communications technologies, relates to a signal sending device, a signal receiving device, a symbol timing synchronization method, and a system, and resolves a problem that complexity of symbol timing synchronization performed by a terminal with relatively low crystal oscillator accuracy is high. In a receiving device, a receiving module receives a synchronization signal including a first signal and a second signal. The first signal includes N1 generalized ZC sequences, and the second signal includes N2 generalized ZC sequences. The second signal is used to distinguish different cells or different cell groups. There are at least two generalized ZC sequences with different root indexes in (N1+N2) generalized ZC sequences. A processing module performs a first sliding correlation operation and a second sliding correlation operation on the synchronization signal, and performs symbol timing synchronization according to a relationship between a sliding correlation peak generated when a sliding correlation is performed on the N1 generalized ZC sequences and a sliding correlation peak generated when a sliding correlation is performed on the N2 generalized ZC sequences. This has relatively low implementation complexity, compared with an existing method in which grid search should be performed multiple times to compensate for a relatively large phase rotation.

A method for determining a carrier center frequency in a wireless communications system and apparatus is provided. The method includes: determining, a carrier center frequency used by a base station and UE to communicate, according to a frequency band starting frequency, an absolute radio frequency channel number, a frequency band offset, and a relative radio frequency channel number. According to this application, a time for searching for a cell by a terminal can be reduced, power consumption of the terminal can be reduced, and a battery life can be extended.

A method and a device for wireless communication are disclosed. The base station transmits a first radio signal on first frequency-domain resources in a first time window, and then transmits a first signaling. The center frequency of the first frequency-domain resources is a first frequency; the first frequency-domain resources comprise X subcarrier(s); a center frequency of a first carrier to which the first frequency-domain resources belong is a second frequency; an interval between the first frequency and the second frequency in frequency domain is related to a subcarrier spacing of the X subcarrier(s); the first signaling is used to determine a feature ID of a transmitter of the first radio signal in the first carrier. The present disclosure can independently configure the center frequency of a carrier and the center frequency of a user equipment to avoid resource waste and reduce synchronization complexity.

The present disclosure provides a method of transmitting a Physical Broadcasting Channel (PBCH) by a base station in a wireless communication system. Particularly, the method may include generating a PBCH payload including bits indicating a frame in which the PBCH is transmitted; scrambling at least some of the bits included in the PBCH payload using second and third least significant bits among the bits; and transmitting the bits of the PBCH payload including the at least some scrambled bits to a user equipment.