RADIO LINE CONTROL METHOD

PURPOSE:To prevent a hit by selecting a base station in common to base stations forming a zone just before hand-off and base stations forming a zone just after as a branch of route diversity before and after the hand-off. CONSTITUTION:When a mobile station MS7 during communication moves to a position (2), that is, from a duplicate zone A1 to A2, the MS7 moves to the duplicate zone A2 shown in (3) after hand-off. In this case, base stations BS3, BS4 forming in common the zone A1 before hand-off and the zone A2 after hand-off are selected as the branches for route diversity after and before the hand-off. Thus, the MS7 is in line connection to either a BS3 or a BS4 just before the hand-off for communication and then the hand-off is implemented. As a result, since the MS 7 is in line connection with the same base station just before and just after the hand-off and hand-off is implemented, the hit of the communication at hand-off is prevented.