Wireless telephone/satellite roaming system

• US 5,303,286 A
• Filed: 03/29/1991
• Issued: 04/12/1994
• 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): Kuntz, Curtis
• Assistant Examiner(s): Cumming, William D.
• Application Number:
  US07/678,931
• Time in Patent Office: 1,110 Days
• Field of Search: 342/352, 342/357, 364/423, 379/56, 379/58, 379/59, 379/60, 379/57, 455/12, 455/54.1, 455/13, 375/1, 340/825.06
• US Class Current: 455/428
• 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.

Claims

1. A wireless telephone/satellite telecommunications system operative in connection with a terrestrial communications system, comprising:

at least one satellite in earth orbit;

at least one gateway for communicating between said at least one satellite and the terrestrial communications system;

a network database management system;

at least one wireless telephone transceiver user capable of two-way communication with said at least one satellite, said wireless telephone transceiver user identified with a single terrestrial service area having linking capabilities to said network database management system;

a database, said database containing identification of each user, a physical location of said user, and a home gateway of said user, wherein portions of said database corresponding to users that are logged on to the system are maintained in each said at least one satellite;

means for maintaining and updating said portions of said datasbase in substantially real time; and

means for communicating between said network database management system and said portions of said roaming database, such that each one of said orbiting satellites establishes communications links to and from said user and said terrestrial communications system via a gateway based on information stored on-board said satellite in said portions of said database and further based on on-board processing, so that said user can send and receive traffic via said terrestrial communications system.

2. The system according to claim 1, wherein at least a first satellite and a second satellite contain portions of said database, said system further including means for creating on said second satellite those communications links needed to accomodate traffic from those active users leaving the range of the first satellite;

wherein

said effecting means includes means for 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.

3. The system according to claim 2, wherein said second satellite trails said first satellite in passage over said user.

8. The system according to claim 1 wherein at least one user is roaming outside of the terrestrial service area of said user.

4. In a wireless telephone/satellite telecommunications system operative in connection with a terrestrial communications system for communicating traffic, at least two satellites in orbit, each said satellite comprising:

communications processor uplink means for receiving uplinked communications signals from users, gateways, and network controls;

communications processor downlink means for transmitting communications signals to users, gateways, and network controls;

first decoder means coupled to said communications processor uplink means for decoding uplinked communications signals;

memory means having at least a satellite database of users stored on board each said satellite and a call setup database;

user acceptance processor means coupled to said satellite database of users for processing user requests;

call setup processor means coupled to said user acceptance processor means and to the call setup database for processing call setup requests;

database processor means, route acceptance processor means, and call route processor means coupled to one another and to said satellite database of users and said call setup database, for planning routing of calls;

satellite-to-satellite processor crosslink means for communicating control signals with other like satellites in earth orbit;

control processor uplink/downlink means for receiving and transmitting control signals to and from satellites and network controls;

handoff processor means coupled to said call setup processor means, said route acceptance processor means, and said user acceptance processor means, for processing handoffs between satellites;

second decoder means coupled to said user acceptance processor means and to said handoff processor means, for decoding signals from other satellites; and

first encoder means coupled to said route acceptance processor means, providing handoff acknowledgment signals, and to said handoff processor means for communicating encoded signals to other satellites.

5. In the system according to claim 4, wherein each satellite further comprises:

a CDMA code database in said memory means; and

CDMA code processor means coupled to receive data through said first decoder means for providing CDMA codes from said CDMA code database to said handoff processor and to said communications processor downlink means.

6. In the system according to claim 4, wherein each satellite further comprises:

voice and data buffer and storage means for temporarily storing voice and data information for relay;

first data signal processor means coupled to receive and extract data signals through said first decoder means and coupled to said voice and data buffer and storage means for temporarily storing said data signals;

second data signal processing means coupled to receive data signals temporarily stored in said voice and data buffer and storage means for transmittal to said communications processor downlink means;

first voice signal processing means coupled to receive and extract voice signals through said first decoder means and coupled to said voice and data buffer and storage means for temporarily storing said voice signals; and

second voice signal processing means coupled to receive voice signals temporarily stored in said voice and data buffer and storage means for transmittal to said communications processor downlink means.

7. The system according to claim 6 wherein each said satellite is in low-earth orbit.