Multiplex communications – Diagnostic testing – Of a switching system
Patent
1996-12-12
2000-03-28
Ton, Dang
Multiplex communications
Diagnostic testing
Of a switching system
370469, H04J 316
Patent
active
060440651
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a resource model and architecture for network connection handling in a telecommunication system. In particular the architecture is used for controlling establishment of various types of connections within a distributed network element (NE). The resource model is common to a number of different switching technologies such as STM (synchronous transmission mode) and ATM (asynchronous transfer mode). The resource model as a platform that can be used by a number of different telecommunication applications. Examples of applications are narrow band ISDN (integrated services digital network), broadband ISDN, GSM (global mobile system) networks. PSTN (public switched telephone network).
RELATED TECHNIQUE
In IEEE, 1992, vol 2,p 616-621 there is described a resource model that support a set of broadband communication configurations such as point-to-point connections, point-to-multipoint connections, multipoint-to-point connections and multipoint-to-multipoint connections. The resource model comprises a set of fundamental object types that can be flexibly linked in various ways to support a wide range of communication configurations and form compound object types. This approach is analogous to that used in the UNIX.TM. operating system where files, processes and devices can be linked using pipes, tees and other objects. All objects in the object model are derived from the abstract classes "Edge" and "Vertex" which in their turn are derived from the abstract base class "Resource". Fundamental methods of graph theory are used to model the transport (edges) and processing (vertices) of information streams.
In WO 93/00776 there is described a software architecture for use in program controlled switching exchanges in which application modules are employed to provide services to users of an individual communications application. Resource modules provide specific functional elements of communications services to the applications modules by having access to and control over the exchange hardware.
A drawback with the known resource models is that the resource model is different for different switching technologies.
Another drawback with the known resource models is that an application is integrated with connection control. In practice this means that an application must know (i) the detailed structure of the network it uses, (ii) the detailed network devices used in the network.
It will therefore be difficult to develop new applications, since people involved in such development must have detailed knowledge of the network structure and of the devices used in the network.
It will also be difficult to replace an existing device, such as for example an switch residing in an exchange, an exchange terminal and similar devices, with a new one since the implementation of the new device will have impact on the application. Accordingly the application need to be modified to the new device.
It will also be difficult to expand, contract or otherwise modify existing network since any change made to the network must be reflected in the application.
Another drawback is that an application must know the type of connections it shall use. If new connection services, such as multipoint-to-point connections, are developed, they must be integrated in each of the applications wanting to use the new connection service.
DESCRIPTION OF THE INVENTION
An object of the present invention is to provide a new resource model and architecture which reduces the above disadvantages by separating the application from the connection control. In particular the connection control is accomplished by functions in the resource model architecture. The resource model in its turn is separated from the application.
Another object of the present invention is to provide a generic resource model that is common to different switching technologies.
Still another object of the invention is to provide a resource model which is used to model bearer service networks which are independent of the applications which
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M. Fabian et al., "Object Oriented Structuring of Real Time Systems," IEEE Proceedings of the 31st Conference on Decision and Control, vol. 3, pp. 2529-2530 (Dec. 1992).
K. Koyanagi et al., "Hierarchically Structured Switching Software," IEEE Global Telecommunications Conference, pp. 1918-1922 (Nov. 1993).
S. W. Tu et al., "An Object-Oriented Resource Model for Supporting Signalling and Control of Broadband Services," Int'l Conf. on Communications, Chicago, pp. 616-621 (Jun. 14-19, 1992).
Andersson Staffan
Konradsson Lars Kent
Lindberg Torgny Anders
Stavenow Bengt
Telefonaktiebolaget LM Ericsson
Ton Dang
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