Importance

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Abstract

A centralized database within a Public Switched Telephone Network (PSTN) interfacing with a donor Public Land Mobile Network (PLMN) stores correlation data correlating a network address representing the new home location register (HLR) associated with a ported mobile station's identification number. As the centralized database is updated, such correlation data are further downloaded to the donor HLR. Thereinafter, in situations where the GMSC associated with the donor PLMN receives an incoming signal where no centralized database query has yet been performed, the donor HLR accordingly retrieves the stored network address correlated with the ported mobile station and forwards the incoming signal using the retrieved network address as the Called Party Number. The original mobile station identification number is also included into the Generic Address Parameter (GAP) of the routed IAM signal. The modified IAM signal is then routed to the proper Gateway Mobile Switching Center (GMSC) and accordingly forwarded to a mobile switching center (MSC) currently serving the ported mobile station.

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First Claim