RAN is the important capital for the survival of the operator.Nowadays it is faced with highly competitive environment whereas its earning power is getting weaker.Meanwhile

the traffic of the mobile Internet service rises rapidly.Therefore

the expenditure used to construct

operate and update RAN has been increasing constantly.The operator must work out the way to provide wireless service with low cost for customers.With the appearance of C-RAN

the effective solutions to different problems will become available.This thesis is devoted to the exploration and analysis of C-RAN and its technical framework

advantages

strategies for evolvement as well as improvement

and its application situation at present

etc.