Patent ID: 6920122

Claim:
A control method of assigning a channel to a plurality of modem processing means of a radio frequency (RF) base station to demodulate a base band received signal and modulate a transmit data signal, said modem processing means each operating in a time-multiplexing manner, said control method comprising the steps of: converting a plurality of carrier frequency band signals received by a plurality of antennas provided in said RF base station to a plurality of base band received signals in a RF unit; storing a plurality of said base band received signals in a buffer memory; and assigning a respective channel to a respective modem processing means for demodulating said base band received signals and for modulating said transmit data signals, including the steps of: (a) enabling a controller to check the loads of a plurality of said modem processing means, and (b) assigning a channel to a modem processing means still having a minimum level of load margin if there are a plurality of said modem processing means still having a load margin, respectively, wherein channel assignment to a plurality of said modem processing means is in a hand-over processing executed by a RF mobile station moving from a first sector controlled by said RF base station to a second sector so that a second channel for demodulating a second signal received by a second antenna of said RF base station and a first channel for demodulating a first signal received by a first antenna are assigned a same modem processing means, said first signal being transmitted from said RF mobile station and forming a first sector, said second signal being transmitted from said RF mobile station and forming a second sector, and wherein said same modem processing means of said RF base station combines said first signal received by the first antenna and said second signal received by the second antenna to output a combined signal.