Base station apparatus of mobile communication system

A transmission method in a base station having a plurality of sectors, having a plurality of radio channels in each of the sectors, and transmitting signals each composed of a plurality of frames through the plurality of the radio channels in each of the sectors, the transmission method comprising the steps of:

• generating a plurality of signals;
• spreading each of the plurality of generated signals by using a long code;
• and
• transmitting the plurality of spread signals such that each one of the plurality of signals is transmitted through a distinct corresponding radio channel in a distinct corresponding sector,
• wherein the step of spreading makes a phase of the long code different from each other between the plurality of sectors,
• the step of transmitting makes frame transmission timings of the plurality of spread signals different from each other between the plurality of sectors, and
• the step of transmitting makes, for any given sector of the plurality of sectors, the frame transmission timing of the corresponding spread signal transmitted through each of the plurality of radio channels, different from each other between the plurality of channels within any given sector of the plurality of sectors.