Method for interacting residual resources between heterogeneous networks

The invention discloses a method for interacting residual resources between heterogeneous networks, and is mainly used for solving the problem of the lack of an effective residual resource interacting mechanism between the heterogeneous networks. The method comprises the following interacting steps that: 1, a source base station transmits a resource state request message, and requests a target base station for residual resource state information; 2, the target base station calculates residual resource information by using a resource mapping table and a measurement result, writes the residual resource information into a resource state response message and transmits the resource state response message to the source base station; 3, the source base station acquires the residual resource information of the target base station according to the response message of the target base station; 4, the target base station transmits a resource state update message according to a report period required by the source base station; and 5, the source base station transmits the resource state request message to the target base station, and terminates a resource state reporting process. By the invention, the resource interaction between the heterogeneous networks can be realized in case of not increasing the system complexity, so the method is applicable to residual resource interaction between the heterogeneous networks and the signaling design of the fourth generation mobile communication system.