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Method for establishing an inbound call to the mobile telephone in a GSM cellular mobile telephone network

  • US 5,400,390 A
  • Filed: 03/09/1993
  • Issued: 03/21/1995
  • Est. Priority Date: 06/06/1991
  • Status: Expired due to Term
First Claim
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1. A method for setting up an inbound call to a mobile telephone in a cellular mobile telephone network comprising a home location register for permanently storing location and subscriber data on mobile telephones registered with the network, the geographic coverage area of the network being divided into smaller service areas each comprising a mobile switching centre and a visitor location register for temporarily storing subscriber data on mobile telephones currently located within said service area, the geographic coverage area of each service area being further divided into radio cells each comprising at least one fixed radio station capable of establishing a radio link with the active mobile telephones currently located in the radio cell, in which the method comprises the steps ofa mobile switching centre receives the subscriber number of the mobile telephone and requests the home location register to provide call routing information,the home location register requests a roaming number from the visitor location register within the service area of which the mobile telephone is currently located,the home location register receives from the requested visitor location register information that there is a call transfer operation activated for said mobile telephone to a call transfer number,the home location register initiates independently a new roaming number request for said call transfer number, andthe home location register forwards the obtained roaming number to said mobile switching centre for call routing of a respective call to a respective mobile telephone.

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