A wireless communication system includes a wireless base station and an access control device. The wireless base station is configured to perform a wireless communication with a user terminal. The access control device is connected to a higher level network at an upstream side while being connected to the wireless base station at a downstream side and configured to control an access by the wireless base station to the higher level network. The access control device includes a reception unit and a processing unit. The reception unit is configured to receive a first signal transmitted from the wireless base station. The processing unit is configured to perform a processing depending on a type of abnormality which has occurred at the downstream side of the access control device. The type of abnormality is determined, from among plural types of abnormalities, based on the received first signal.