Automatic satellite/terrestrial mobile terminal roaming system and method

• US 6,072,768 A
• Filed: 09/04/1996
• Issued: 06/06/2000
• Est. Priority Date: 09/04/1996
• Status: Expired due to Term

• Current Assignee: Globalstar Incorporated, Golobalstar L.P.
• Original Assignee: Globalstar Incorporated
• Inventors: Wiedeman, Robert, Sites, Michael J.
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US08/707,534
• Time in Patent Office: 1,371 Days
• Field of Search: 340/825.44, 370/316, 370/320, 375/200, 455/13.1, 455/405, 455/12.1
• US Class Current: 455/428
• CPC Class Codes: H04B 7/18563 Arrangements for interconnecting multiple systems data switching networks H04L12/00

Abstract

A communications system includes a satellite communications component having at least one satellite and at least one terrestrial gateway, and also a wireless terrestrial communications component having at least one repeater and at least one mobile switching center. The at least one gateway and the at least one mobile switching center are coupled together by a first mobile applications part (MAP) network, such as an IS-41 or GSM MAP network. The at least one gateway and the at least one mobile switching center are further coupled to a terrestrial communications network (PSTN). The system further includes at least one dual mode or higher user terminal having a first transceiver for bidirectionally communicating with the gateway through the satellite, a second transceiver for bidirectionally communicating with the mobile switching center through the repeater, and a controller, responsive to one of a user selected or a gateway selected protocol, for selectively enabling either the first or the second transceiver for conveying a user communication to the terrestrial communications network.

Claims

1. A communications system, comprising:

at least one user terminal;

a satellite communications component comprising at least one satellite and at least one terrestrial gateway;

a wireless terrestrial communications component comprising at least one repeater and at least one mobile switching center;

said at least one gateway and said at least one mobile switching center being coupled together by a first mobile applications part network, said at least one gateway and said at least one mobile switching center further being coupled to a terrestrial communications network; and

said at least one user terminal comprising a first transceiver for bidirectionally communicating with said gateway through said satellite, a second transceiver for bidirectionally communicating with said mobile switching center through said repeater, and control means, responsive to a gateway selected system selection protocol, for enabling either said first transceiver or said second transceiver for conveying a user communication to said terrestrial communications network;

wherein

said communications system is further comprised of a data base storing data representing a map that indicates poor quality communications areas within a gateway service area, and wherein said gateway selected system selection protocol is modified as a function of said data from said data base;

wherein said gateway is bidirectionally coupled to said mobile applications part network through one of a home location register or a visitor location register; and

wherein said gateway is bidirectionally coupled to a second mobile applications part network through one of a home location register or a visitor location register.

2. A communications system as set forth in claim 1, wherein said terrestrial communications network is comprised of a public switched telephone network.

3. A communications system as set forth in claim 1,

wherein said system is further comprised of a data base storing data representing a historical record of user terminal availability within a gateway service area, and wherein said gateway selected system selection protocol is modified as a function of said data from said data base.

4. A communications system as set forth in claim 1, wherein said gateway is comprised of first interface means for coupling said gateway to said first mobile applications part network and a second interface means for coupling said gateway to said second mobile applications parts network.

6. A communications system as set forth in claim 1, wherein said gateway is further comprised of means for storing pages directed to said user terminal when said user terminal is not available to receive pages, and for subsequently delivering said stored pages to said user terminal when said user terminal is enabled to receive pages.

5. A communications system, comprising:

at least one user terminal;

a satellite communications component comprising at least one satellite and at least one terrestrial gateway;

a wireless terrestrial communications component comprising at least one repeater and at least one mobile switching center;

said at least one gateway and said at least one mobile switching center being coupled together by a first mobile applications part network, said at least one gateway and said at least one mobile switching center further being coupled to a terrestrial communications network; and

said at least one user terminal comprising a first transceiver for bidirectionally communicating with said gateway through said satellite, a second transceiver for bidirectionally communicating with said mobile switching center through said repeater, and control means, responsive to a gateway selected system selection protocol, for enabling either said first transceiver or said second transceiver for conveying a user communication to said terrestrial communications network;

wherein

said communications system is further comprised of a data base storing data representing a map that indicates poor quality communications areas within a gateway service area, and wherein said gateway selected system selection protocol is modified as a function of said data from said data base,

wherein said gateway is comprised of first interface means for coupling said gateway to said first mobile applications part network and a second interface means for coupling said gateway to a second mobile applications parts network, and

wherein said second interface means also couples said gateway to said terrestrial communications network.

7. A method for operating a communications system, comprising steps of:

providing at least one user terminal, providing a satellite communications component that comprises at least one satellite and at least one terrestrial gateway, and providing a wireless terrestrial communications component that comprises at least one repeater and at least one mobile switching center, the at least one user terminal being provided so as to comprise a first transceiver for bidirectionally communicating with the terrestrial gateway through the at least one satellite and a second transceiver for bidirectionally communicating with the at least one mobile switching center through the at least one repeater;

coupling together the at least one gateway and the at least one mobile switching center with a first mobile applications part network;

further coupling the at least one gateway and the at least one mobile switching center to a terrestrial communications network; and

operating a controller of the at least one user terminal to be responsive to a gateway selected system selection protocol for enabling either the first transceiver or the second transceiver for conveying a user communication to the terrestrial communications network;

the method further comprising steps of,

storing data in a data base accessible by the at least one gateway, the stored data representing a map indicating poor quality communications areas within a gateway service area; and

modifying the gateway selected system selection protocol as a function of data stored in the data base.

8. A method as in claim 7, wherein the step of coupling includes a step of bidirectionally coupling the at least one gateway to the mobile applications part network through one of a home location register or a visitor location register.

9. A method as in claim 8, wherein the step of coupling includes a step of bidirectionally coupling the at least one gateway to a second mobile applications part network through one of a home location register or a visitor location register.

11. A method as set forth in claim 7, and further comprising steps of:

storing pages in the at least one gateway, the stored pages being those directed to the user terminal when the user terminal is not available to receive pages; and

subsequently delivering the stored pages to the user terminal when the user terminal is enabled to receive pages.

13. A method as set forth in claim 7, and further comprising a step of operating the controller of the at least one user terminal to be responsive instead to a user selected system selection protocol for enabling either the first transceiver or the second transceiver for conveying a user communication to the terrestrial communications network.

10. A method for operating a communications system, comprising steps of:

providing at least one user terminal, providing a satellite communications component that comprises at least one satellite and at least one terrestrial gateway, and providing a wireless terrestrial communications component that comprises at least one repeater and at least one mobile switching center, the at least one user terminal being provided so as to comprise a first transceiver for bidirectionally communicating with the terrestrial gateway through the at least one satellite and a second transceiver for bidirectionally communicating with the at least one mobile switching center through the at least one repeater;

coupling together the at least one gateway and the at least one mobile switching center with a first mobile applications part network;

further coupling the at least one gateway and the at least one mobile switching center to a terrestrial communications network; and

operating a controller of the at least one user terminal to be responsive to one a gateway selected system selection protocol for enabling either the first transceiver or the second transceiver for conveying a user communication to the terrestrial communications network, and further comprising steps of;

storing data in a data base accessible by the at least one gateway, the stored data representing a historical record of user terminal availability within a gateway service area; and

modifying the gateway selected system selection protocol as a function of data stored in the data base.

12. A method as set forth in claim 10, and further comprising steps of:

storing pages in the at least one gateway, the stored pages being those directed to the user terminal when the user terminal is not available to receive pages; and

subsequently delivering the stored pages to the user terminal when the user terminal is enabled to receive pages.

14. A method as set forth in claim 10, and further comprising a step of operating the controller of the at least one user terminal to be responsive instead to a user selected system selection protocol for enabling either the first transceiver or the second transceiver for conveying a user communication to the terrestrial communications network.