Low earth orbit distributed gateway communication system

• US 5,884,142 A
• Filed: 04/15/1997
• Issued: 03/16/1999
• Est. Priority Date: 04/15/1997
• Status: Expired due to Term

• Current Assignee: Globalstar Incorporated
• Original Assignee: Globalstar Incorporated
• Inventors: Wiedeman, Robert A, Monte, Paul A
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): GELIN, JEAN ALLAND
• Application Number:
  US08/834,238
• Time in Patent Office: 700 Days
• Field of Search: 455/427, 455/429, 455/432, 455/443, 455/12.1, 455/13.1, 455/13.2, 455/13.3, 455/456, 455/509, 455/450, 455/454, 455/69, 342/354, 342/357
• US Class Current: 455/12.1
• CPC Class Codes: H04B 7/18556 using a location database
• CPC Class Codes: H04B 7/18567 Arrangements for providing additional services to the basic mobile satellite telephony service
• CPC Class Codes: H04B 7/18578 Satellite systems for providing broadband data service to individual earth stations for selecting H04W; provisions for broadband connection, H04Q11/0478

Abstract

A communication system includes a satellite communication system segment having at least one satellite, that projects a plurality of beams on the surface of the earth, and at least one terrestrial satellite gateway that is bidirectionally coupled to the at least one satellite and also to a terrestrial communications system. One or more beams from one or more satellites at the surface of the earth define a regional service area within which at least one Wireless Local Loop (WLL) service region is located. The communication system further includes a terrestrial communication segment having at least one WLL base station, capable of bidirectional communications with a plurality of WLL user terminals within the WLL service region, and a virtual gateway that is bidirectionally coupled to the WLL base station and to the at least one satellite. The virtual gateway is responsive to the terrestrial satellite gateway for temporarily assuming control of some satellite system resources for bidirectionally coupling a communication to or from an individual one of the WLL user terminals into or out of the WLL service region.

Claims

1. A method for operating a communication system, comprising steps of:

receiving a call for a user terminal at a satellite system gateway;

examining a database to determine if the user terminal is associated with a localized service area within a coverage area of the satellite system gateway;

if yes, formulating a message and transmitting the message to a virtual gateway that serves the regional service area, the message being transmitted via at least one satellite;

receiving the message at the virtual gateway and paging the user terminal; and

upon the user terminal responding to the page, establishing the call using satellite system resources that are allocated to the virtual gateway from the satellite system gateway.

2. A method as in claim 1, wherein the allocated satellite system resources comprise frequency channels.

3. A method as in claim 1, wherein the allocated satellite system resources comprise spreading codes.

4. A method as in claim 1, wherein the user terminal is a mobile terminal.

5. A method as in claim 1, wherein the user terminal is a fixed terminal.

6. A method as in claim 1, wherein the at least one satellite is a portion of a constellation of non-geosynchronous orbit satellites.

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

receiving a call for a user terminal at a virtual gateway that serves a localized service area within a coverage area of a satellite system gateway;

examining a database to determine if the called user terminal is associated with a localized service area that is served by the virtual gateway;

if yes, establishing the call;

if no, formulating a message and transmitting the message to the satellite system gateway, the message being transmitted via at least one satellite;

receiving the message at the satellite system gateway and examining a database to determine if the called user terminal is associated with a second localized service area within the coverage area of the satellite system gateway;

if yes, formulating a message and transmitting the message to a second virtual gateway that serves the second localized service area, the message being transmitted via at least one satellite;

receiving the message at the second virtual gateway and paging the user terminal; and

upon the user terminal responding to the page, establishing the call using satellite system resources that are allocated to the second virtual gateway from the satellite system gateway.

8. A method as in claim 7, wherein the allocated satellite system resources comprise frequency channels.

9. A method as in claim 7, wherein the allocated satellite system resources comprise spreading codes.

10. A method as in claim 7, wherein the user terminal is a mobile terminal.

11. A method as in claim 7, wherein the user terminal is a fixed terminal.

12. A method as in claim 7, wherein the at least one satellite is a portion of a constellation of non-geosynchronous orbit satellites.