A method for paging a user equipment, UE, in a radio access network, RAN, served by a core network node. When a UE attaches to the radio access network, a service area identity included in the respective a respective registration message from each UE, is received and registered in the core network node. The method further includes a step of receiving one or more data packets to be sent to a receiving UE attached to the network and determining a permitted latency for delivery of the one or more data packets to the UE. When permitted latency exceeds a predetermined latency threshold, a step of retrieving the registered SAI for the receiving UE is performed. In a concluding step in the method of paging, a first page is performed of the UE, directing the first page to cells belonging to a first paging area determined by the retrieved SAI.