Cloud radio access network system and control method thereof

A control method of a cloud radio access network system comprising a plurality of remote signal sources, a baseband processing unit pool, an access management server, a software defined network controller and at least one network signal forwarder, the at least one network signal forwarder being electrically connected to the remote signal sources, the baseband processing unit pool and the software defined network controller, the access management server being electrically connected to the software defined network controller, the control method comprising steps of:

• the at least one network signal forwarder determining whether an access signal from one of the remote signal sources conforms to a predetermined rule;
• when the access signal conforms to the predetermined rule, the at least one network signal forwarder generating a first notification signal corresponding to the access signal and transmitting the first notification signal to the software defined network controller;
• and
• the software defined network controller generating a request signal according to the first notification signal and transmitting the request signal to the access management server,
• wherein signal transmission between the software defined network controller and the access management server is independent of the at least one network signal forwarder.