Patent ID: 9125220
Filing Date: 2015-09-01
Classification: H04W

Abstract:
1. A mobile communication system which controls an in-out reception level for determining whether or not a mobile station is to camp on a cell formed by a base station, comprising: circuitry comprising an acquisition unit configured to acquire a radio communication state of a neighboring cell located around a cell formed by a base station which the mobile station camps on among base stations; and a level determination unit configured to determine the in-out reception level based on an acquisition result of the radio communication state by the acquisition unit, wherein the acquisition unit acquires a reception level of the base station receiving a radio channel transmitted by the neighboring cell, and a transmission level of the radio channel transmitted by the neighboring cell, wherein based on a highest reception level among the reception levels of the base station receiving radio channels transmitted by neighboring cells and a transmission level of the radio channel in a target base station transmitting a radio channel having the highest reception level, the level determination unit calculates an estimated distance between the base station and the target base station, based on the calculated estimated distance, the level determination unit calculates an estimated reception level of the radio channel in a reception level tie point in which the reception level of the radio channel transmitted by the base station and the reception level of the radio channel transmitted by the target base station become substantially equal to each other, and determines the in-out reception level based on the calculated estimated reception level, and wherein the level determination unit calculates a first estimated reception level based on a propagation loss equation and the transmission level of the radio channel transmitted by the base station, calculates a second estimated reception level based on the propagation loss equation and the transmission level of the radio channel transmitted by the target base station, calculates the reception level tie point so that the first estimated reception level and the second estimated reception level become equal to each other, and determines the calculated first estimated reception level as the in-out reception level.