Qualcomm Globalstar GSP-1600 User's Guide download pdf (Page 5)

TG84-73001-1C X1

Worldwide Roaming

Areas not governed by ANSI-41 use the GSM standard (Global System for Mobile

Communication). This standard is common in Europe and is published by the European

Telecommunications Standards Institute (ETSI).

The Globalstar system is designed to simultaneously support phones that are ANSI-41-

based and GSM-based. This is done over the common Globalstar Air Interface (GAI).

To support worldwide roaming, a tri-mode phone must be able to connect to an ANSI-41

Globalstar system anywhere in the global service area, and a Globalstar GSM phone must

be able to connect to a GSM Globalstar system. Almost every Gateway has an attached

GSM Mobile Switching Center (MSC). The Gateway provides the ANSI-41 capability, and

interworks with the GSM MSC for GSM capability.

When a subscriber with an ANSI-41 phone roams to an area served by a GSM network he

will register with the Visitor Location Register (VLR) of the local Gateway, and use

Globalstar satellite service.

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Qualcomm Globalstar GSP-1600 User's Guide Page 5