METHOD AND SYSTEM FOR DETERMINING THE LOCATION OF A MOBILE SUBSCRIBER REGISTERED IN A CELLULAR MOBILE RADIO NETWORK

摘要

Method and system for determining the location of a mobile subscriber registered in a cellular mobile radio network A lower signalling load and shorter connecting delay compared with the known two-stage location interro-gation is achieved in the case of optimal routing due to the fact that the home location register (HLRB) itself, when receiving the message (SRIL) for location interroga-tion, checks the feasibility of setting up the direct connection between gateway mobile switching centre (GMSCA) of a first network (IPLMN) and visited mobile switching centre (VMSCB) of another network (VPLMN) for reasons of charging for the call and, if the result of the check is positive, sends a modified message which additionally contains a code (PRN) for requesting a temporary mobile subscriber roaming number (MSRN) to the visitor location egister (VLRB). As a result, the home location register can carry out the feasibility check of setting up the connection for reasons of charging for the call already after the first reception of a location interrogation and call up immediately i.e. without waiting for another location interrogation by the gateway mobile switching centre the mobile subscriber roaming number from the responsible visitor location register and send it to the requesting gateway mobile switching centre.