SYSTEM AND METHOD FOR MOBILE COMMUNICATIONS IN COEXISTENCE WITH ESTABLISHED COMMUNICATIONS SYSTEMS

Title:

SYSTEM AND METHOD FOR MOBILE COMMUNICATIONS IN COEXISTENCE WITH ESTABLISHED COMMUNICATIONS SYSTEMS

Document Type and Number:

WIPO Patent Application WO/1995/027381

Kind Code:

A1

Abstract:

A mobile communications system (10) provides communications with mobile users (22) in the interference zones (32) of communications services having priority of use of the frequency band in which the mobile user operates. The frequency band has been previously allocated for use by other services, such as fixed microwave service (FMS) (26); however, by means of the invention, the mobile user is able to conduct communications on a subband or subbands in that frequency band. A position locating system (12) determines the position of the mobile user, and if the user (22) is within an interference zone (30), the mobile user is assigned subbands for operation in the previously allocated frequency band that is outside the subbands of the FMS (26). The system may have surface and/or satellite nodes and a network controller that monitors the mobile user's position and controls the nodes and user to subbands. Mobile users are isolated from the FMS sites either by continuous management of their frequency assignments, by calculations and commands sent from the network controller to the mobile user or by computations of the mobile user's unit.

Inventors:

OTTEN DAVID D

Application Number:

PCT/US1995/002297

Publication Date:

October 12, 1995

Filing Date:

February 24, 1995

Export Citation:

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Assignee:

CELSAT AMERICA INC (US)

International Classes:

H04B7/185; H04B7/26; H04B1/16; H04W16/14; (IPC1-7): H04Q7/36

Foreign References:

US5040238A	1991-08-13
US5247701A	1993-09-21
US5142691A	1992-08-25
US5276908A	1994-01-04
US5073900A	1991-12-17
US5365451A	1994-11-15

Other References: