Patent ID: 8175606
Filing Date: 2012-05-08
Classification: H04W

Abstract:
1. A wireless communication system comprising: a plurality of base stations that wirelessly communicate with a plurality of wireless terminals; and a base station controller that controls the plurality of base stations wherein: said base station controller comprises a soft handoff execution control unit and a base station information management unit that manages information on the controlled base stations, when a measurement value of a received radio wave intensity of a base station, which has not yet established a communication path with a wireless terminal in a soft handoff status, is received from said wireless terminal, said soft handoff execution control unit references said base station information management unit, calculates a ratio between the received measurement value of the received radio wave intensity and a measurement value of a highest received radio wave intensity of base stations that have already established communication paths with said wireless terminal and, based on the calculated ratio and a traffic channel usage rate of the base station with which said wireless terminal has not yet established a communication path, judges if a communication path can be established between said wireless terminal and said base station, and two levels of judgment criterion thresholds, a first threshold and a second threshold, are set for the traffic channel usage rate of the base station and two types of judgment criterion values, a first criterion value and a second criterion value, are set for the radio wave intensity ratio and it is judged that a communication path can be established if the traffic channel usage rate is lower than the first threshold, if the traffic channel usage rate is equal to or higher than the first threshold and is equal to or lower than the second threshold and the radio wave intensity ratio is higher than the first criterion value, or if the traffic channel usage rate is higher than the second threshold and the radio wave intensity ratio is higher than the second criterion value.