p u2032 bts1 or p u2032 bts2 assuming that mrc is to be used at the mobile station these results are stored in storage regions allocated to bts 1 and bts 2 in the second set of storage regions of the required tx power storage portion 64 in step s 13 the interference calculation portion 66 employs the required downlink transmission powers p u2032 bts1 and p u2032 bts2 calculated in step s 12 to determine a measure of the network interference that would result assuming that bts 1 is transmitting at p u2032 bts1 and bts 2 is transmitting at p u2032 bts2 the resulting interference measure i mrc is stored in a further one of the storage regions of the interference storage portion 68 next in step s 14 the interference comparison portion 70 compares the interference measures i bts1 and i bts2 retrieved from the interference storage portion 68 if i bts1 is less than i bts2 processing proceeds to step s 15 in which i bts1 is compared with i mrc if i bts1 lt i mrc in step s 15 in step s 16 the bts selection portion 72 determines that the downlink signal in the next time slot should be sent to the mobile station by bts 1 alone on the basis that this will result in the lowest network interference the bts selection portion 72 generates a bts selection message bsm specifying that bts 2 is not to transmit the downlink signal in the next time slot the bsm is delivered to the transmitter portion 46 of the mobile station for transmission to bts 2 at the same time the bts selection portion 72 determines the power.