Telephonic communications – Special services – Anonymous party
Patent
1997-03-24
2000-10-31
Smith, Creighton
Telephonic communications
Special services
Anonymous party
379207, H04M 342
Patent
active
061414077
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method and arrangement for resolving performance feature interactions in a communication system with switching control and performance feature control decoupled from one another, in what are called IN-type architectures (in this context, IN means Intelligent Networks).
Prior art switching systems support a plurality of performance features. These features include auxiliary telecommunication services, such as for example:
Two types of performance features are to be distinguished. On the one hand there are performance features that are explicitly activated (FReq) and are called in response to reception of an initiating event. The feature CFU is an example of this type. On the other hand, there are performance features that are called directly (via FReq) without having been activated previously, such as when activation and calling coincide. The features CONF or CC are examples of this. All performance features can be requested using an "activation" message FReq.
In processor-controlled switching installations, performance features are realized within the switching control sequences. These switching control sequences, also called switching software, contain the call controlling as well as the performance features. The performance features are combined with the call controlling, as well as with one another. This leads to a high degree of software complexity, whereby the software structure becomes inflexible with respect to the introduction of newer performance features. In order to shorten the long introduction times for new performance features, consideration has been given to the possibility of realizing the parts of the control sequences, that were previously dependent on one another, as separated from one another in independent modules that respectively have a fixed external interface. Approaches to the separation of the performance feature control from the switching control are pursued in the context of the standardization processes relating to intelligent networks "Intelligent Network" in ITU-T SG 11. On this subject, see the CCITT guidelines "New Recommendation Q.1214, Distributed Functional Plane for Intelligent Network CS-1, COM XI-R212-E", pages 7 to 69, as well as appendix pages 7 to 9.
A cleanly structured switching architecture results from the decoupling of the performance feature control from the switching control, which is reduced to its basic functionality. This switching architecture is constructed in a very modular fashion, and allows the rapid introduction of new performance features. Moreover, a development independent of the performance features and the call control is enabled by the separation of the performance features.
A structure of this sort divides a switching system or, respectively, the switching software into a basic switching system and a performance feature system, i.e., the switching control and the performance feature control are decoupled from one another. The main components of a basic switching system are a call control, a database and a plurality of performance feature control components. The call control is reduced to its fundamental tasks, the setting up and clearing down of connections or, respectively, calls, and is thus designated the basic call control. The performance feature control components form a set of functions, via which access can take place to the call objects and via which calls can thus be manipulated.
The performance features themselves are contained in the performance feature system, which communicates with the basic switching system via a protocol. The basic call control of the basic switching system has the job of carrying out the setting up and clearing down of calls or, respectively, of the associated connections according to subscriber requests. In the context of its normal operating sequence, it thus handles a two-subscriber call. In addition, mechanisms are provided for the reporting of determined events to the performance feature control. The basic switching system can control a c
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Sato et al. Functional Elements for Switching Software Based on Object-Oriented Paradigm with UPT as an Example, IEICE Trans. Commun., vol. E75-B, No. 10, Oct., 1992, pp. 1052-1060.
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Siemens Aktiengesellschaft
Smith Creighton
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