Patent ID: 6035198
Filing Date: 2000-03-07
Classification: H04W

Abstract:
A method for determining a location of a mobile subscriber registered in a cellular mobile radiotelephone network for an optimal routing given a mobile terminated call directed to the mobile subscriber, comprising the steps of:sending, based on a subscriber call number of a called mobile subscriber, a message for a location request, across networks, from a gateway mobile switching center of a first network to a home register of a second another network in which the mobile subscriber is permanently registered with subscriber data of the mobile subscriber;sending a message from the home register for the location request to a visitor register of a further network, in which the mobile subscriber is currently registered based on a current location of the mobile subscriber;allocating a visited mobile switching center to the visitor register;determining for optimal routing, if a direct connection is established between the gateway mobile switching center and the visited mobile switching center with respect to charging of the call;checking, upon receipt of the location request message from the home register, feasibility of a setup of the direct connection and providing a test result indicative thereof;sending if the test result is positive indicating that a direct route is establishable, a modified message, additionally containing a flag for a request of a temporary mobile subscriber roaming number, to the visitor register.