Patent ID: 9026108
Filing Date: 2015-05-05
Classification: H04W

Abstract:
1. A method for providing an emergency functionality when setting up a call directed to a User Equipment in a public land mobile network, the public land mobile network comprising a home database for permanently storing location and subscriber data concerning the User Equipment registered with the public land mobile network, the geographical coverage area of the public land mobile network being divided into a plurality of smaller service areas, wherein a first service area of the plurality of service areas is served by a visitor database of the public land mobile network, wherein the visitor database is provided for temporarily storing subscriber data concerning the User Equipment currently located within the first service area, the method comprising, in case of the occurrence of a mobile terminating call towards the User Equipment: requesting, by a requesting entity, that the home database provide information specific to the User Equipment to the requesting entity; and in case of a failure of the functionality of the home database, converting, by the requesting entity, a Send Routing Info (SRI) procedure adapted for the home database to a Provide Roaming Number (PRN) procedure directed to the visitor database; requesting, by the requesting entity, that the visitor database provide the information specific to the User Equipment; converting, by the requesting entity, a result of the PRN procedure to a result of an SRI procedure; and delivering the converted result to a destination base station entity.