A call method, device and system in multi-network common coverage condition

The present invention provides a paging method at the state of multiple-network covering. The network side is stored with the UE position area information of the user facility which is known beforehand and is allowed to be accessed into a first network and a second network. The area which is represented by the position area information at least comprises a first network covering area and a second network covering area with overlapping area. The method comprises the following procedures: confirming a specific network which the UE is arranged in by the network side; and paging the UE preferentially in part area of area represented by the position area information by the network side based on the confirming result. Besides, the invention also provides a network-side paging device and system thereof in the state that the multiple-network covering is realized. Through the technical scheme of the invention, the paging load at the network side can be reduced on the base that the frequent TAU is avoided.