Wireless telephone/satellite roaming system

• US 5,715,297 A
• Filed: 09/15/1995
• Issued: 02/03/1998
• Est. Priority Date: 03/29/1991
• Status: Expired due to Term

• Current Assignee: Globalstar Incorporated
• Original Assignee: Space Systems/Loral Incorporated (Loral Space and Communications Incorporated)
• Inventors: Wiedeman, Robert A.
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US08/528,797
• Time in Patent Office: 872 Days
• Field of Search: 379/60, 455/62, 380/21
• US Class Current: 455/427
• CPC Class Codes: B64G 1/1007 Communications satellites
• CPC Class Codes: B64G 1/1085 Swarms and constellations
• CPC Class Codes: H04B 7/18556 using a location database

Abstract

A wireless telephone system capable of servicing a roaming wireless telephone user includes a satellite communications system consisting of one or more orbiting satellites, each carrying a database of users, destination codes and call codes, within a satellite service area, a satellite control center, and a plurality of terrestrial communications links. The system operates by effecting communication between a terrestrial wireless telephone end user transceiver apparatus and a terrestrial communications link via a single relay through a single satellite or a succession of satellites wherein the relay station may be in motion relative to the end user transceiver apparatus and the terrestrial communications link, wherein the orbiting relay station effects the ultimate decision on linking based on stored on-board information and on-board processing, and wherein the end user transceiver apparatus, the orbiting satellite and the terrestrial communications link are operative in cooperation with the on-board database to effect hand-off from a first orbiting satellite to a second orbiting satellite. The satellite system is a single satellite or preferably a constellation of satellites orbiting near the earth, all of which are capable receiving requests for calls and participating in the call routing and call setup on an autonomous basis. The satellites are capable of decoding the calls, switching, handing off of calls to other satellites, and updating databases of users based on information provided by network control.

Claims

1. A method for communicating through a wireless telephone/satellite telecommunications system having at least one satellite in non-geosynchronous earth orbit, gateways into a terrestrial telecommunications system, and at least one wireless transceiver user capable of direct two-way communication of communications traffic with a satellite from within a satellite service area, said method comprising the steps of:

maintaining a central network database management system;

maintaining on-board each satellite a database of active users, each database of active users containing an identification of each active user, a physical location of each active user, and a home gateway of each active user;

identifying each wireless transceiver user with a single terrestrial service area having linking capabilities to said network database management system; and

linking a satellite to a wireless transceiver user based on information stored on-board said satellite in said database of active users;

wherein

communications traffic that said user wishes to send to a recipient is not directly passed between satellites over an intersatellite link; and

said system comprises at least a first satellite and a second satellite, said method further comprising the step of;

processing said information in said database of active users on-board said first satellite to effect hand-off of said communications links from said first satellite to said second satellite, including transferring to the second satellite that part of the database containing those active users leaving the range of the first satellite and entering the range of the second satellite.

2. The method according to claim 1, wherein said second satellite trails said first satellite in passage over said user to maintain coverage in said terrestrial service area.

3. A method for communicating through a wireless telephone/satellite telecommunications system having at least one satellite in non-geosynchronous earth orbit, gateways into a terrestrial telecommunications system, and at least one wireless transceiver user capable of direct two-way communication of communications traffic with a satellite from within a satellite service area, said method comprising the steps of:

maintaining a central network database management system;

maintaining on-board each satellite a database of active users, each database of active users containing an identification of each active user, a physical location of each active user, and a home gateway of each active user;

identifying each wireless transceiver user with a single terrestrial service area having linking capabilities to said network database management system; and

linking a satellite to a wireless transceiver user based on information stored on-board said satellite in said database of active users;

wherein

communications traffic that said user wishes to send to a recipient is not directly passed between satellites over an intersatellite link, said method further comprising the steps of;

establishing a wireless transceiver user as a roamer by means of said user issuing a request for roaming; and

updating the database of active users to include said user.

4. The method according to claim 3 wherein the user is in the satellite service area.

5. The method according to claim 3 wherein the user is in a terrestrial service area within the satellite service area.

6. A method for communicating through a wireless telephone/satellite telecommunications system having at least one satellite in non-geosynchronous earth orbit, gateways into a terrestrial telecommunications system, and at least one wireless transceiver user capable of direct two-way communication of communications traffic with a satellite from within a satellite service area, said method comprising the steps of:

maintaining a central network database management system;

maintaining on-board each satellite a database of active users, each database of active users containing an identification of each active user, a physical location of each active user, and a home gateway of each active user;

identifying each wireless transceiver user with a single terrestrial service area having linking capabilities to said network database management system; and

linking a satellite to a wireless transceiver user based on information stored on-board said satellite in said database of active users;

wherein

communications traffic that said user wishes to send to a recipient is not directly passed between satellites over an intersatellite link;

the user initiates an inbound call;

the satellite authenticates the user using its onboard database;

the satellite accepts the inbound call from the user if the user has been authenticated; and

the satellite establishes gateway routing for call setup;

said initiating, authenticating, accepting, and establishing steps being performed without participation from the ground.

7. The method according to claim 6 wherein the satellite processes handoff of calls to a trailing satellite.

8. A method for communicating through a wireless telephone/satellite telecommunications system having at least one satellite in non-geosynchronous earth orbit, gateways into a terrestrial telecommunications system, and at least one wireless transceiver user capable of direct two-way communication of communications traffic with a satellite from within a satellite service area, said method comprising the steps of:

maintaining a central network database management system;

maintaining on-board each satellite a database of active users, each database of active users containing an identification of each active user, a physical location of each active user, and a home gateway of each active user;

identifying each wireless transceiver user with a single terrestrial service area having linking capabilities to said network database management system; and

linking a satellite to a wireless transceiver user based on information stored on-board said satellite in said database of active users;

wherein

communications traffic that said user wishes to send to a recipient is not directly passed between satellites over an intersatellite link;

the user initiates an outbound call;

the satellite authenticates the user using its onboard database;

the satellite accepts the outbound call from the user if the user has been authenticated; and

the satellite establishes gateway routing for call setup;

said initiating, authenticating, accepting, and establishing steps being performed without participation from the ground.