Multiplex communications – Pathfinding or routing – Through a circuit switch
Patent
1995-05-25
1997-01-21
Hsu, Alpus H.
Multiplex communications
Pathfinding or routing
Through a circuit switch
370384, 370395, H04Q 1104
Patent
active
055965725
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In the development of future switching systems, efforts are being made to design software systems which are as modular as possible for controlling the switching system. This is being done primarily with respect to better decoupling of the individual functions of a switching system and thus of a simpler subsequent modification capability and improved reusability of the switching software in further developments.
General considerations of the possibility of priority assignment to processes are known, inter alia, from the Article "Proze-Prozessor-Zuordnung in Multi prozessorsystemen mit globalen und lokalen Speicher resourcen zur Steuerung von Vermittlungsprozessen" [Process-processor assignment in multiprocessor systems having global and local memory resources for controlling switching processes] by H.-J. Schwertfeger in the Journal Nachrichtentechnik Elektronik [Telecommunications Electronics], Vol. 35, No. 10, 1985, Berlin, pages 365-370.
A general software model for an ATM switch node is known from the article "An ATM-Switching Test" by G. P. Balbony et. at., in the document European Trans actions on Telecommunications and related Technologies, Vol. 2, No. 4, Aug. 1991, Milan, pages 391-401.
In modular connection systems for controlling connections at the logic level, it is highly conducive for the improvement of the modularization capability if the modules of such a connection system are able to submit autonomous connection requests to a switching control system for controlling the connections at the physical level. However, problems in the coordination of the connection control result from this autonomous production of connection requests.
SUMMARY OF THE INVENTION
The invention is based on the problem of specifying a coordination system by means of which coordination of the autonomous connection requests of a connection system for controlling connections at the logic level is achieved with respect to a switching control system for controlling connections at the physical level.
This problem is solved by a coordination system for coordinating connection requests of a modular connection system to a switching control system, the connection system being used for controlling connections at the logic level, and the switching control system being used to control connections at the physical level. The coordination system has coordination modules which are designed such that they:
receive from the connection system and buffer-store connection requests produced for an active connection end point involved with the connection;
pass on a connection request, which is buffer-stored by them, to the switching control system when they have received control over an active connection end point; and
surrender control over a specific active connection end point to one another in such a manner that only one coordination module ever has control over this active connection end point at a specific point in time.
The coordination system according to the invention results in it only ever being possible to submit one connection request to the resource control system, of the connection requests produced by the connection system, at a specific point in time. This ensures a logically sensible sequence of connection requests to the resource control system.
In a further embodiment of the present invention the coordination system has:
coordination modules of a first type which are designed in such a manner that they can achieve control over in each case one active connection end point of a connection;
coordination modules of a second type which are designed in such a manner that they can achieve control over in each case two active connection end points of a connection, there being in each case only one coordination module of the second type per connection end point pair in the coordination module chain of a connection; and
priority control in accordance with which a coordination module has higher priority with respect to the control of a connection end point the closer it is to the end point of the coordin
REFERENCES:
patent: 4821256 (1989-04-01), Schmidt et al.
patent: 4903258 (1990-02-01), Kuhlmann et al.
patent: 5051982 (1991-09-01), Brown et al.
patent: 5390171 (1995-02-01), Storm
patent: 5434852 (1995-07-01), La Porta et al.
Cutler John W.
Wille-Fier Regina
GPT Ltd.
Hsu Alpus H.
Siemens Aktiengesellschaft
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