Patent ID: 8843079

Claim:
A communication apparatus that identifies a fault of a radio link between a radio terminal and a radio base station, comprising: a statistical information acquisition unit configured to acquire statistical information indicating a state of the radio link between the radio terminal and the radio base station from at least one of the radio terminal and the radio base station; and a fault identification unit configured to identify a fault of the radio link based on an acquired statistical information from among a plurality of faults associated with a plurality of statistical information beforehand, wherein the statistical information includes: one or both of a terminal side channel load indicating a ratio of time during which the radio terminal judges that the radio link is busy in a predetermined time and a base station side channel load indicating a ratio of time during which the radio base station judges that the radio link is busy in the predetermined time, a frequency of failures to receive an acknowledgment (ACK) frame, a reception frequency of duplicate data frames which are frames identical to a previously received data frame, and one or both of a reception frequency of Request to Send (RTS) frames received by the radio base station from a different radio base station or a different radio terminal that belongs to the different radio base station and a reception frequency of RTS frames received by the radio terminal from the different radio base station or the different radio terminal, wherein the frequency of failures to receive an ACK frame includes one or both of a frequency of failures by the radio terminal to receive an ACK frame from the radio base station or a frequency of failures by the radio base station to receive an ACK frame from the radio terminal, wherein the reception frequency of duplicate data frames includes one or both of a reception frequency of duplicate data frames received by the radio terminal from the radio base station or a reception frequency of duplicate data frames received by the radio base station from the radio terminal, and wherein the fault identification unit identifies whether the radio terminal exists as a hidden terminal or an exposed terminal based on determinations of whether the frequency of failures to receive the ACK frame exceeds an ACK threshold, whether the reception frequency of duplicate frames is equal to or lower than a duplicate threshold, and whether the base station side channel load exceeds a channel threshold, the terminal side channel load exceeds a channel threshold, or the reception frequency of RTS frames exceeds an RTS threshold.