BILLING MECHANISM FOR A MOBILE COMMUNICATION NETWORK

1 . A method for charging a user of a mobile communication device connected to a communication network, the method comprising:

detecting a predetermined trigger event in a trigger unit of the mobile communication device;

detecting the predetermined event;

generating, in response to the detection of the predetermined event, a consent message in a message generating unit of the mobile communication device; and

sending the consent message to the communication network, the receipt of the consent message prompting a payment process.

2 . The method recited in claim 1 , wherein the trigger event is detected when a trigger message is received in the mobile communication device.

3 . The method recited in claim 2 , wherein the trigger message is transparently forwarded to the trigger unit.

4 . The method recited in claim 1 , wherein the trigger message includes first information about the amount to be charged, the information being used by the message generating unit for including second information about the amount in the consent message.

5 . The method recited in claim 1 , wherein the trigger message is sent by a server unit connectable to the mobile communication device via a network connection, when the user of the mobile communication device uses a service with costs.

6 . The method recited in claim 1 , wherein the trigger unit validates an authenticity of the trigger message using a cryptographic feature of the trigger message.

7 . The method recited in claim 1 , wherein the trigger event comprises a receipt of a call in the mobile communication device or an entrance of the mobile communication device in a predetermined radio cell of the communication network.

8 . The method recited in claim 1 , wherein the mobile communication device comprises a mobile terminal and a subscriber identification module and wherein an adapter module is being connected between the mobile terminal and the subscriber identification module, the adapter module comprising the trigger unit and the message generating unit.

9 . The method recited in claim 1 , wherein the message generating unit uses SAT or USAT commands to instruct the mobile terminal to send the consent message to the communication network.

10 . The method recited in claim 1 , wherein the payment process comprises a transmission of a premium SMS message from the mobile communication device to the communication network or from the communication network to the mobile communication device, the transmission of the premium SMS prompting charging the user.

11 . A mobile communication device for connecting to a communication network, the mobile communication device comprising:

a message generating unit adapted to generate a consent message and to control the mobile communication device to send the message to the communication network, the receipt of the consent message prompting a payment process; and

a trigger unit coupled to the message generating unit, the trigger unit being adapted to initiate the generation of the consent message in the message generating component, if the trigger unit detects a predetermined trigger event.

12 . The mobile communication device recited in claim 11 , further comprising a mobile terminal and a subscriber identification module and wherein an adapter module is connected between the mobile terminal and the subscriber identification module, the adapter module comprising the trigger unit and the message generating unit.

13 . A payment system comprising:

a mobile communication, for connecting to a communication network, the mobile communication device comprising:

a message generating unit adapted to generate a consent message and to control the mobile communication device to send the message to the communication network, the receipt of the consent message prompting a payment process; and

a trigger unit coupled to the message generating unit, the trigger unit being adapted to initiate the generation of the consent message in the message generating component, if the trigger unit detects a predetermined trigger event; and

a first server connected to the communication network, the first server being adapted to receive the consent message and to control the payment process upon receipt of the consent message.

14 . The payment system recited in claim 13 , comprising a second server connectable with the mobile communication device, the second server being adapted to send a trigger message to the mobile communication device, wherein the trigger unit is adapted to detect the trigger event, when the trigger message is received in the mobile communication device.