Patent
1995-08-03
1997-05-20
Beausoliel, Jr., Robert W.
G06F 1100
Patent
active
056320140
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and arrangement for trying out in advance prerequisites for introducing new services in a telecommunications system. When introducing new services, supplementary services, in a complex system, for example a telecommunications system, it is an advantage and in practice a necessity that, with the development of each new service, one only needs to take into consideration how the new service will function together with a basic part of the existing system (base system) or together with the base system and some service developed earlier and on which the new service is intended to build. Not to have to take into consideration supplementary services developed earlier and any services which are developed in parallel reduces the development so significantly that this can be considered to be the normal way of attacking the problem with supplementary services.
PRIOR ART
However, this method entails the risk that different supplementary services introduced interfere with one another in a manner which cannot be predicted in a design, so-called interservice interference, through combination effects between the different supplementary services.
A complete development is traditionally made to end when each service by itself is installed in the existing telecommunications system. It has been attempted to attack the problem of interservice interference by carrying out limited manual analyses, as a rule based on the designer's own earlier experiences. Alternatively, the interference problems have not been uncovered until the operation of the resulting system, which results in the work for correcting the problem being much harder.
Thus, the technical problem is to identify a problem of the type of interservice interferance at an earlier stage with respect to specific services and to understand the causal connection which causes it. This problem is solved by the present invention.
SUMMARY OF TEE INVENTION
The present invention thus provides a method for testing services in a telecommunications system, a base system being described in a specification language, a new service being described in the specification language as separate supplement to the base system description and the base system description and the supplement being linked together to form a description of the total resultant system. The total system is then analysed, for example by reachability analysis.
The invention also relates to an arrangement for carrying out the method including a specification language generator which translates specifications of a base system and a new service to respective descriptions in a specification language, a linking element which links together the descriptions formed into a description of the total resultant system and analysis aids which analyse the total description.
Embodiments of the invention are specified in greater detail in the subsequent patent claims.
SHORT DESCRIPTION OF THE DRAWINGS
The invention will now be described in detail with reference to the following drawing, the only figure of which is a block diagram of the arrangement according to the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The invention builds on the fact that the telecommunications system in which the new services will be introduced, that is to say the base system, is described by a formal specification language. This is an established technique and there are a number of formal languages which are used for the purpose. The services which will be supplied are described by the same language as separate supplements to the base system description. The supplementary services can be analysed separately for verifying that they will function together with the base system in the intended way. The different services thus described can then be brought together to form a description of the total resultant system. The system can then be analysed by known analysis techniques, for example reachability analysis, in order to identify problems which could occur as a consequence o
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Bosco, "An Intelligent Network Test Bed for Service Design, Validation and Execution", Proceddings, IEEE, Seminar on Digital Communications pp. 103-118 Mar. 1992.
Ek Anders
M.ang.nsson Lennart
Beausoliel, Jr. Robert W.
Palys Joseph E.
Telia AB
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