DS - CDMA cellular mobile systems using QPSK modulation, QPSK modulation with rolling reduction factor of 0.22 liters of cosine filter, its base station antenna is equipped with three sectors, the user data rate for 32 KB/s, extension factor is 128, voice activity factor is 1, interference power ratio between zones for 1/2, if the requirement for each user expectations ber of 10 ^ - 3, then calculating how much can a community service users, assumes that the thermal noise on the influence of the number of users can be neglected,