Communication terminal device

1. A communication terminal device, comprising:

a message generation circuit configured to generate an information inquiry message which specifies that another communication terminal device should transmit information about performance features of units in the physical layer or the data link layer of the other communication terminal device to that communication terminal device;

a transmitting circuit configured to transmit the information inquiry message;

a receiving circuit configured to receive an information message with the information about performance features from the other communication device terminal; and

a selection circuit configured to use the information about performance features to select units in the physical layer or the data link layer of the communication terminal which should be used to set up a communication link to the other communication terminal device.

2. The communication terminal device of claim 1 , further comprising:

a control circuit configured to control the selected units in the physical layer or the data link layer of the communication terminal device such that a communication link is set up to the other communication terminal device.

3. The communication terminal device of claim 1 ,

wherein the message generation circuit generates the information inquiry message when a predetermined event occurs, and wherein the transmitting circuit transmits the information inquiry message that is generated, when the predetermined event occurs.

4. The communication terminal device of claim 3 ,

wherein the predetermined event is the communication terminal device being switched on, a communication link between the communication terminal device and the other communication terminal device being terminated, a request from the user of the communication terminal device, a request from a program which is being run on the communication terminal device, or the reception of an instruction message which requests that the information inquiry message be generated and transmitted.

5. The communication terminal device of claim 1 ,

wherein the transmitting circuit is further configured to transmit the information inquiry message to the other communication terminal device.

6. The communication terminal device of claim 1 ,

wherein the transmitting circuit is further configured to transmit the information inquiry message to a third communication terminal device, with the request to the third communication terminal device to pass on the information inquiry message to the other communication terminal device.

7. The communication terminal device of claim 1 ,

wherein the communication terminal device and the other communication terminal device are communication terminal devices for communication over a short distance.

8. The communication terminal device of claim 1 ,

wherein the units in the physical layer or the data link layer allow communication based on Bluetooth, IrDA or WLAN.

9. The communication terminal device of claim 8 ,

wherein the units in the physical layer or the data link layer allow communication using the ISM frequency band or the UWB frequency band.

10. The communication terminal device of claim 1 , further comprising:

a memory device configured to store the information about performance features, with the information about performance features being associated by means of identifications or addresses of the units in the physical layer or the data link layer with the units in the physical layer or the data link layer.

11. A method for requesting communication terminal device information which should be transmitted to a communication terminal device, the method comprising:

generating an information inquiry message which specifies that another communication terminal device should transmit information about performance features of units in the physical layer or the data link layer of the other communication terminal device to that communication terminal device;

transmitting the information inquiry message;

receiving an information message with the information about performance features from the other communication device terminal; and

selecting units in the physical layer or the data link layer of the communication terminal which should be used to set up a communication link to the other communication terminal device using the received information about performance features.

12. The method of claim 11 , further comprising:

controlling the selected units in the physical layer or the data link layer of the communication terminal device such that a communication link is set up to the other communication terminal device.

13. The method of claim 11 ,

wherein the information inquiry message is generated and transmitted when a predetermined event occurs.

14. The method of claim 11 ,

wherein the information inquiry message is transmitted to the other communication terminal device.

15. The method of claim 11 ,

wherein the information inquiry message is transmitted to a third communication terminal device, with the request to the third communication terminal device to pass on the information inquiry message to the other communication terminal device.

16. The method of claim 11 ,

wherein the communication terminal device and the other communication terminal device are communication terminal devices for communication over a short distance.

17. The method of claim 11 ,

wherein the units in the physical layer or the data link layer allow communication based on Bluetooth, IrDA or WLAN.

18. The method of claim 11 , further comprising:

storing the information about performance features, with the information about performance features being associated by means of identifications or addresses of the units in the physical layer or the data link layer with the units in the physical layer or the data link layer.

19. A communication terminal device, comprising:

a message generation circuit configured to generate an instruction message for transmission to a second communication terminal device, which message specifies that the second communication terminal device:

should generate an information inquiry message which specifies that a third communication terminal device should transmit information about performance features of units in the physical layer or the data link layer of the third communication terminal device to the second communication terminal device;

should transmit the information inquiry message; and

after receiving the information about performance features, should pass the information about performance features on to the communication terminal device; and

a transmitting circuit configured to transmit the instruction message.

20. The communication terminal device of claim 19 ,

wherein the units in the physical layer or the data link layer allow communication based on Bluetooth, IrDA or WLAN.

21. The communication terminal device of claim 20 ,

wherein the units in the physical layer or the data link layer allow communication using the ISM frequency band or the UWB frequency band.

22. A method for requesting communication terminal information which should be transmitted to a communication terminal device, the method comprising:

generating an instruction message for transmission to a second communication terminal device, which message specifies that the second communication terminal device:

should generate an information inquiry message which specifies that a third communication terminal device should transmit information about performance features of units in the physical layer or the data link layer of the third communication terminal device to the second communication terminal device;

should transmit the information inquiry message; and

after receiving the information about performance features, should pass the information about performance features on to the communication terminal device; and

transmitting the instruction message.

23. The method of claim 22 ,

wherein the units in the physical layer or the data link layer allow communication based on Bluetooth, IrDA or WLAN.

24. The method of claim 23 ,

wherein the units in the physical layer or the data link layer allow communication using the ISM frequency band or the UWB frequency band.

25. A communication terminal device, comprising:

a message generation means for generating an information inquiry message which specifies that another communication terminal device should transmit information about performance features of units in the physical layer or the data link layer of the other communication terminal device to that communication terminal device;

a transmitting means for transmitting the information inquiry message;

a receiving means for receiving an information message with the information about performance features from the other communication device terminal; and

a selection means for selecting units in the physical layer or the data link layer of the communication terminal which should be used to set up a communication link to the other communication terminal device using the received information about performance features.