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ATM-SAT

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Based Multimedia Communication via LEO-Satellites

Future low earth orbit (LEO) satellite networks for multimedia will be seamlessly integrated into the environment of terrestrial broadband networks which use the Asynchronous Transfer Mode ATM as transmission and switching protocol for multimedia information. Therefore, the satellite networks have to adopt the ATM transmission scheme and implement ATM switches on-board the satellites.
However, compared to communication in fixed networks, satellite communication is characterised by special constraints (signal delay, channel quality, dynamic network topology) requiring the development of new ATM-based communication technology for LEO satellite systems.

The aim of the ATM-Sat project is to complete this technically challenging and strategically important R&D task in a cooperation between DLR's Institute of Communications and Navigation, Oberpfaffenhofen, Fraunhofer FOKUS, Berlin), and Tesat-Spacecom GmbH, Backnang.

Objectives

ATM-Sat developed the concept and the communication technology for a multimedia satellite system with:

• Low Earth Orbit satellites
• intersatellite links
• on-board ATM switching
• fixed and mobile terminals
• ATM-Sat verified the developed communication technology with a demonstrator

The project contained a research-oriented part and a demonstrator part.

The research-oriented part of the project was devoted to the fundamentals of satellite ATM communications and aimed at the development of a system concept, transmission schemes, and protocols for a reference system that could be considered a future commercial system and is called “target system”. This part of the project was mainly treated by the HGF partners.
In the demonstrator part of the project the industrial partner Tesat-Spacecom provided a laboratory prototype of an on-board ATM switch, which was modified, and used in a common activity to demonstrate satellite ATM switching and ATM-based protocols for multiple access and resource management. Also, the demonstrator was used to measure the performance of the implemented protocols.

Download

List of Publications ATM-Sat Workshop 2002 (DOWNLOAD)

1. Dr. E. Lutz: ATM-Sat Projektübersicht (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
2. Dr. H. Bischl: A MAC Protocol for ATM over Satellite (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
3. A. Donner: Intersatellite Link (ISL) Networks (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
4. Dr. H. Bischl: Fehlersicherung für die ATM-Übertragung über Satellit (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
5. M. Emmelmann: TCP over Satellite -- Effects of Advertised Receive Buffer Size, Timer Granularity and Bit Error Rates (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
6. Dr. P. Todorova: Resource Management for Reliable Handoff in Low Earth Orbit (LEO) Satellite ATM Networks (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
7. F. Krepel: ATM-Sat Demonstration Environment (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
8. Prof. Dr. A. Jacob ( Gastvortrag): Smart Antenna Terminal - SANTANA (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
9. Hespeler: COMED ATM Payload Demonstrator (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
10. W. Buerkle: ATM Based OBP-Payload for the MEDIS Satellite System (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.
11. Dr. L. Richard: Active Antennas for Mobile Terminals (PDF), ATM-Sat Workshop 2002, FhG FOKUS Berlin, 19.Juni 2002.

ATM-Sat was a project financed by the strategy fund of the
Hermann von Helmholtz Association of German Research Centres (HGF)