Method, base stations and system for link establishment

The invention relates to a method, base stations and a system for link establishment. The method comprises the steps that the first base station and the second base station establish a second link through a first link between the first base station and the second base station; the first base station is in communication with the second base station through the first link and/or the second link. According to the method, base stations and communication system for the link establishment, through the existing first link, the second link is established between the two base stations, in this way, the two base stations can be in communication through the first link and/or the second link, service requirements can be satisfied, and meanwhile air interface link resources are saved to the maximum degree.