CDMA type mobile radio communication system capable of realizing an effective system operation with neither an excess nor a deficiency of simultaneously connected radio base stations

摘要

In a code division multiple access (CDMA) cellular type mobile radio communication system, in order to realize effective system operation with neither more nor less of radio base stations (12-1, 12-2) which are simultaneously communicated with a mobile station (13) on carrying out soft handoff, it is possible for the mobile station (13) to communicate with the radio base stations having proper numbers in accordance with propagation environment and a moving speed (Vms) of the mobile station (13) by changing threshold levels (Ta, Tr) for selection of the radio base stations and a hysteresis margin therefor on the basis of a variation rate in a propagation loss (Li(t)) estimated by a reception level of a pilot signal.