A method for synchronization in a base station, comprising: transmitting a first radio signal on first frequency-domain resources in a first time window; and transmitting a first signaling; wherein a center frequency of the first frequency-domain resources is a first frequency; the first frequency-domain resources include X subcarrier(s); the X is a positive integer; a carrier to which the first frequency-domain resources belong is a first carrier; a frequency band to which the first carrier belongs is a first frequency band, a center frequency of the first carrier is a second frequency; an interval between the first frequency and the second frequency in frequency domain is a first frequency interval; the first frequency interval is related to a subcarrier spacing of the X subcarrier(s); the first radio signal is used to determine at least one of a location of the first time window in time domain or the first frequency; the first radio signal is broadcast; or the first radio signal is multicast; the first signaling is used to determine a cell ID of a transmitter of the first radio signal in the first carrier, said method being characterized in that a frequency interval between the first frequency and a lowest frequency of the first frequency band is equal to a sum of P times of a first raster and a second frequency offset; the P is a positive integer; the first raster is determined by a location of the first frequency band in frequency domain; the second frequency offset is a predefined value that is less than or equal to a first threshold; the first threshold is a non-negative number; the first threshold is smaller than the first raster; the first threshold is determined by a location of the first frequency band in frequency domain. transmitting a first radio signal on first frequency-domain resources in a first time window; and transmitting a first signaling; wherein a center frequency of the first frequency-domain resources is a first frequency; the first frequency-domain resources include X subcarrier(s); the X is a positive integer; a carrier to which the first frequency-domain resources belong is a first carrier; a frequency band to which the first carrier belongs is a first frequency band, a center frequency of the first carrier is a second frequency; an interval between the first frequency and the second frequency in frequency domain is a first frequency interval; the first frequency interval is related to a subcarrier spacing of the X subcarrier(s); the first radio signal is used to determine at least one of a location of the first time window in time domain or the first frequency; the first radio signal is broadcast; or the first radio signal is multicast; the first signaling is used to determine a cell ID of a transmitter of the first radio signal in the first carrier, said method being characterized in that a frequency interval between the first frequency and a lowest frequency of the first frequency band is equal to a sum of P times of a first raster and a second frequency offset; the P is a positive integer; the first raster is determined by a location of the first frequency band in frequency domain; the second frequency offset is a predefined value that is less than or equal to a first threshold; the first threshold is a non-negative number; the first threshold is smaller than the first raster; the first threshold is determined by a location of the first frequency band in frequency domain.