Patent ID: 8606324

Claim:
A cell identifier deciding method comprising: judging whether cell identifiers allocated to cells contained by a plurality of radio base stations conflict among the plurality of radio base stations; when judged that cell identifiers contained by the plurality of radio base stations do conflict, changing a conflicting cell identifier of a radio base station based upon conditions imposed on changing of cell identifiers in the plurality of radio base stations; reducing the sending power used to send notice information from the radio base station when it is judged that a conflict exits; receiving the notice information sent from another radio base station in the plurality of radio base stations using the mobile terminal; sending the radio base station the notice information that the mobile terminal has received; specifying the plurality of radio base stations which are judged as having cell identifiers on the basis of the notice information sent from the mobile terminal; and establishing a communication connection among the plurality of specified radio base stations, wherein the judging by judging that a conflict exists when a request for re-connection of a cell having the same cell identifier is made from a mobile terminal to a radio base station a predetermined number of times or more; and wherein the changing is performed by: sending an instruction signal to instruct not to change the cell identifier is sent to the other radio base station and the changed cell identifier to the other radio base station via the established communication connection, in the case that the above one radio base station changes the cell identifier, while, sending an instruction signal for instructing to change the cell identifier to the other radio base station via the established communication connection, in the case that the above one radio base station does not change the cell identifier.