FIELD: radio engineering, communication.
SUBSTANCE: in a multi-carrier cellular communication system, a second synchronisation code (a Walsh code or a GCL series code) mapped on a second synchronisation channel is used as a signal for specifying in which cell of the base station a mobile station terminal device is located. A signal transmitted from the base station to the mobile station terminal device is mapped in a radio frame having two-dimensional extension in frequency and time directions. The synchronisation channel on which the first and second synchronisation channels are mapped is built into a plurality of areas in the radio frame. When mapping a certain series number of the second code for specifying a cell or a cell group on the radio frame as the second synchronisation channel, phase rotation or circular shift in which one radio frame is one cycle is applied to the second synchronisation code. On the receiving side, the head timing of the radio frame is determined by obtaining the phase rotation angle or the amount of circular shift of the second synchronisation code.
EFFECT: high accuracy of detecting a synchronisation channel.
9 cl, 13 dwg
