Resource allocation method, device and system

Provided are a resource allocation method, device and system, which are applicable to the field of communications and can improve the overall utilization rate of discovery resources. The resource allocation method is used for a base station, and comprises: acquiring a current resource indication of a cell; according to the current resource indication of the cell, generating a resource adjustment indication, the resource adjustment indication being used for indicating that a mobility management entity (MME) should adjust a discovery resource allocated to the cell; generating a resource adjustment request, the resource adjustment request comprising the resource adjustment indication; and sending the resource adjustment request, so that the MME adjusts the discovery resource of the cell according to the resource adjustment request. The resource allocation method, device and system provided in embodiments of the present invention are used for allocating communication resources.