D2D relay resource configuration method, device and system

The embodiment of the application discloses a D2D relay resource configuration method, a D2D relay resource configuration device and a D2D relay resource configuration system. The method comprises the steps as follows: a first terminal obtaining configuration information issued by a base station, wherein the configuration information comprises a side-chain link discovering resource pool, and the side-chain link discovering resource pool is only used for discovering the first terminal, and the first terminal is a terminal with a relay function; using the side-chain link discovering resource pool to broadcast information that the first terminal has the relay function, or using the side-chain link discovering resource pool to transmit a response message to a far-end terminal after receiving a discovering request transmitted by the far-end terminal , wherein the response message is used for indicating that the first terminal has the relay function. In the application, the base station configures the resource pool which is specially used for discovering the terminal with the relay function for the terminal with the relay function so as to avoid the phenomenon that the far-end terminal needs to switch monitoring in a plurality of resource pools. The D2D relay resource configuration method, the D2D relay resource configuration device and the D2D relay resource configuration system of the invention improve efficiency of discovering the terminal with the relay function and shorten the time consumption of the process for establishing a D2D communication link.