Telephony systems have evolved from the Plain Old Telephony System providing only
the basic functionality of making phone calls, to sophisticated systems in which many features
have been introduced, providing network subscribers more control on the call establishment
process. However, these facilities are confronted with a major obstacle known as the feature
A feature interaction occurs when at least one feature is prevented from performing its
functionality or when the system functions incorrectly due to the presence of features.
In the first part of the thesis, we present a model for describing telephony features at the
requirements stage. This model is built using the Use Case Maps Notation (UCM). Based on this
model, we propose a method to filter feature interactions at the requirements stage. This
preliminary evaluation allows the detection process to focus on feature combinations where
interactions are possible and therefore reduces the cost of the detection process.
In the second part of the thesis, a Feature Interaction Detection System is developed for
detecting feature interactions between switch based and IN features. This method aims to detect
interactions occurring at the abstract specification level and resulting in violation of feature
properties. This technique in based on the Formal Description technique LOTOS and uses
Abstract Data Types to detect those violations. Our method detects feature interaction by
executing the system specification. The designer can reach those interaction points either by a
step by step execution or using the goal oriented execution technique.
It is concluded that UCM and LOTOS are useful in specifying the telephony system with
features and for detecting feature interactions at the abstract specification level.
- 12 Oct 2005
- Please feel free to discuss this article directly on this page. Constructive comments are welcomed! Please sign your TWiki name.
| Title || Feature Interaction Filtering and Detection with Use Case Maps and LOTOS |
| Authors || J. Hassine |
| Type || Thesis |
| Conference/Journal Title || |
| Volume/Number || |
| Editors || |
| Publisher || SITE, University of Ottawa |
| Month || February |
| Year || 2001 |
| Pages || 156 |
| DOI || |
| Keywords || feature interaction, use case maps, feature modeling, feature interaction detection, LOTOS |