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Proceedings Paper

Scheduling deep-space network data transmissions: a Lagrangian relaxation approach
Author(s): Colin E. Bell
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Paper Abstract

For various projects (satellites) one must schedule transmissions to receiving antennas on earth for a one week planning horizon. Periods of time in which any satellite is `in view' of any antenna are known in advance. The scheduling problem is formulated as an integer linear program. This formulation includes a large number of non-conflict constraints stating that an antenna must not receive data from two or more satellites simultaneously. There are also a smaller number of service level constraints specif)ed by project managers to assure appropriate levels of service. For example, service level constraints might specify for a particular project: a maximum allowable gap between the end of one transmission and the start of the next, a minimum total number of minutes of transmission during a week, a minimum number of transmissions on any day, etc. Lagrangian Relaxation allows service level constraints to be relaxed (temporarily ignored). These constraints are replaced by economic penalties for not satisfying them. The resulting modified scheduling problem is easily solved. The paper concentrates on formulation, solution by Lagrangian Relaxation, and performance on an example using real data for a week in 1996.

Paper Details

Date Published: 23 March 1993
PDF: 11 pages
Proc. SPIE 1963, Applications of Artificial Intelligence 1993: Knowledge-Based Systems in Aerospace and Industry, (23 March 1993);
Show Author Affiliations
Colin E. Bell, Univ. of Iowa (United States)

Published in SPIE Proceedings Vol. 1963:
Applications of Artificial Intelligence 1993: Knowledge-Based Systems in Aerospace and Industry
Usama M. Fayyad; Ramasamy Uthurusamy, Editor(s)

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