Accession Number:

ADA282878

Title:

Real-Time Symbolic Model Checking for Discrete Time Models

Descriptive Note:

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE

Personal Author(s):

Report Date:

1994-05-02

Pagination or Media Count:

20.0

Abstract:

The BDD-based symbolic model checking algorithm given in 4.10 is extended to handle real-time properties using the bounded until operator 9. We believe that this algorithm which is based on discrete time is able to handle many real-time properties that arise in practical problems. One example of such a property is priority increasing. This is a serious problem that can make real- time systems unpredictable in subtle ways. Our work discusses this problem and presents one possible solution. The solution is formalized and verified using the modified algorithm. We also propose another extension to the model checking algorithm. Timed transition graphs are transition graphs in which events may take non-unit time to occur. The time it takes for a transition in a TTG to happen is determined by a time interval. This allows the construction of smaller and more realistic models. A symbolic model checking algorithm is given for formulas using the bounded until operator in TTG models.

Subject Categories:

  • Operations Research

Distribution Statement:

APPROVED FOR PUBLIC RELEASE