Browse Prior Art Database

POINT TO POINT WIDEBAND COMMUNICATIONS VIA IRIDIUM SYSTEM

IP.com Disclosure Number: IPCOM000008893D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-22
Document File: 4 page(s) / 270K

Publishing Venue

Motorola

Related People

Ronald Victor Chandos: AUTHOR

Abstract

The following presents a new revenue-produc- ing IRIDIUM data service which can potentially co- exist with the current IRIDIUM voice/messaging/ data services. It includes a description of both the technique and the equipment needed to implement the technique. The proposed new service exploits the often under-utilized. IRIDIUM crosslinks and ground links to support a new class of high speed leased line point to point communications for users requiring bandwidths up to 3 megabits per second. The resulting data service could be sold to major corporations (e.g. a 3 MHz data pipe from Motorola's Corporate Headquarters to its European Headquarters).

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MOTOROLA Technical Developments

POINT TO POINT WIDEBAND COMMUNICATIONS

VIA IRIDIUM@ SYSTEM

by Ronald Victor Chandos

ground links are needed to support the concept of world-wide coverage, but are nevertheless idle a good deal of the time. This excess backbone traffic capacity is the basis for the proposed new IRIDIUM service.

INTRODUCTION

  The following presents a new revenue-produc- ing IRIDIUM data service which can potentially co- exist with the current IRIDIUM voice/messaging/ data services. It includes a description of both the technique and the equipment needed to implement the technique. The proposed new service exploits the often under-utilized. IRIDIUM crosslinks and ground links to support a new class of high speed leased line point to point communications for users requiring bandwidths up to 3 megabits per second. The resulting data service could be sold to major corporations (e.g. a 3 MHz data pipe from Motorola's Corporate Headquarters to its European Headquarters).

  This new service is made possible through some of the capabilities inherent in the IRIDIUM system. The IRIDIUM constellation contains 66 fully inter- connected satellites, with each satellite projecting up to 48 beams (cells) onto the surface of the earth. Each beam supports a large number of 1.6 Ghz Frequency-Division Multiplexed/Time-Division- Multiplexed (FDM/TDM) channels, providing the subscriber access to the system. Additionally, each satellite supports up to four 20/30 Ghz wide-band links to ground stations, currently used for connec- tion into the terrestrial telephone network and IRID- IUM control facility.

  Each satellite is also capable of supporting wide-band, full duplex digital data channels with up to four of its neighboring satellites. This connectivi- ty is needed to fulfill the IRIDIUM charter of full coverage to any point on the earth. With the large number of fully interconnected satellites, the IRIDI- UM constellation has tremendous backbone data capacity, considerably larger than needed to support the subscriber traffic for the current services. Therefore, many of the satellite crosslinks and

PROPOSED SOLUTION

  The proposed system involves a new IRIDIUM element, a K-Band Access Gateway. Access Gateways would be sold/leased in pairs to data users, such as large corporations, and located at two distant points on the globe. Two or more gateways would connect to the constellation in the normal manner, providing a 3.125 megabit per second full duplex packet data connection between at least two end points. The back end of a gateway is tailored to the end users needs, and typically comprises a Local Area Network or some other source/sink of medium speed digital information.

  Access to the system is obtained through use of normal gateway channels and information format. For example is, a 30 Ghz uplink and a 20 Ghz downlink, running in the full duplex mode could be used. Information will be transferred using the nor-

mal IRIDIUM Transfer Mode...