| 摘要 |
The invention relates to a method and a control system (15) allowing devices, which are provided with different sets of sub-functions (A, B, C, D, B*C) on different markets, to be complemented with new sub-functions which are structured like modules that fit into all existing devices. This is accomplished by structuring the device into sub-functions selected in accordance with the inventive method, the sub-functions in turn being structured into partial-states and analyses results. The invention sets out rules for how sub-functions may refer to each other, the rules being based upon an analyses of logical dependencies existing between the sub-functions of a device. A structured sub-function is similar to a module that fits into any structured device provided the identified logical dependencies are not violated. A sub-function may modify and complement other sub-functions to which it, in accordance with the rules, is allowed to refer. The invention solves the problem of interaction between sub-functions (B*C). The control system (15) provides for a unitary interface (16) by which a modular sub-function can be added to or removed from an existing device (3). In the preferred embodiment of the invention the device is a program controlled telecommunication device. |
