Patent ID: 8654653

Claim:
A method of deciding a radio link failure at a base station based on measurement of a quality of an uplink signal from a terminal, comprising: initializing a signal quality degradation count value; measuring an uplink signal quality at predetermined time intervals; and increasing the signal quality degradation count value when the uplink signal quality is less than a predetermined lower limit quality threshold value, wherein a radio link failure is decided when the signal quality degradation count value reaches a predetermined radio link failure decision threshold value while the measuring of the uplink signal quality and the increasing of the signal quality degradation count value are repetitively performed a predetermined number of times wherein the predetermined number of times is an integer multiple of the predetermined time interval wherein the predetermined number of times is within a time obtained by dividing a time obtained by subtracting a time required for handover signaling after the radio link failure is decided from a predetermined connection drop time which can be endured by a user, by the predetermined time interval.