Wireless communication system and method for controlling wireless communication

A method for controlling wireless communication in a wireless communication system including a wireless base station and an access control device connected to the wireless base station at a downstream side, the access control device controlling an access by the wireless base station to a higher level network connected to the access control device at an upstream side, the method comprising:

• receiving, by the access control device, a first signal transmitted from the wireless base station;
• and
• performing a processing depending on a type of abnormality which has occurred at the downstream side of the access control device, the type of abnormality being determined, from among plural types of abnormalities, based on the received first signal;
• wherein the access control device is configured to establish a session with the wireless base station according to a Point-to-Point Protocol (PPP), and
• the wireless base station is configured to
• access the higher level network through the established session and
• transmit the first signal to the access control device, the first signal including a Link Quality Report (LQR) defined by the PPP.

An access control device for controlling an access by a wireless base station to a higher level network, the access control device being connected to the higher level network at an upstream side while being connected to the wireless base station at a downstream side, the access control device comprising:

• a reception unit configured to receive a first signal transmitted from the wireless base station;
• and
• a processing unit 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 being determined, from among plural types of abnormalities, based on the received first signal;
• wherein the access control device is configured to establish a session with the wireless base station according to a Point-to-Point Protocol (PPP), and
• the wireless base station is configured to
• access the higher level network through the established session and
• transmit the first signal to the access control device, the first signal including a Link Quality Report (LQR) defined by the PPP.