An embodiment of the invention provides a communication system. The communication system includes a user equipment which is moving within a coverage of a first network and a second network and is configured to send a location update request to a third access entity of the second network; and the third access entity which is configured to receive the location update request from the user equipment, acquire information of a first access entity of the first network from the location update request and determine whether a predetermined condition is satisfied If the predetermined condition is not satisfied, the user equipment is paged through the first access entity, and if the predetermined condition is satisfied, the user equipment is not paged through the first access entity. As such, the situation that the UE is paged in an area where it is unlikely to appear can be avoided.