Message transmission system

Details Message transmission system Message transmission system

H - Electricity

04

M

H04M 11/06 (2006.01) H04Q 7/22 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2152215

The system for transmitting messages is used in a mo- bile radio telephone network (1) having a number of termi- nals (4, 9). The terminals may be either permanently allo- cated to a specific user or allocated to a specific user by means of a chip card insertable in the terminal. At least two terminals can enter into voice or data communication with one another in the mobile radio telephone network. The mobile radio telephone network comprises at least one center (8) for controlling the message transmission, each message being a data communication in which data telegrams contain- ing a standardized data header are exchanged. For process- ing special services according to a special procedure acces- sible only to certain authorized subscribers, the data tele- gram comprises an identification code in addition to the standardized data header. A central unit (10) associated with the center and at least some of the terminals have means for generating data telegrams provided with the iden- tification code. The central unit for the special services, as well as authorized terminals or authorized chip cards, are equipped with a filter (12.1, 12.2), preferably a soft- ware filter, for recognizing the identification code. The possibility is thus offered not only of transmitting any de- sired bit streams in transparent mode according to GSM Phase 2, but also of sending data and executable instructions to or receiving them from authorized subscribers without having to change internationally established standards.

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