Transferring of Information in Electronic Price Label Systems

1. A method for transferring information in an electronic price label system, the electronic price label system comprising at least one base station and a plurality of electronic labels, wherein base station(s) and electronic labels comprise at least communication means and information is transferred between base station(s) and electronic labels where in the method comprises: sending first message from a base station to an electronic label using a first frequency band, after sending the first message, sending a second message from the said base station to the said electronic label using a second frequency band, and sending a third message from the said electronic label to the said base station using a second frequency band, said third message being sent from said electronic label to said base station by reflecting back the second message to the said base station.

2. The method of claim 1 , wherein the third message is an acknowl-edgement message to the first message.

3. The method of claim 2 , wherein the first frequency band is a higher frequency band than the second frequency band.

4. The method of claim 1 , wherein the first frequency band is higher frequency band than the second frequency band.

5. The method of claim 4 , wherein the first frequency band is 2.4 GHz ISM-band and the second frequency band is 868 MHz ISM-band.

6. The method of claim 1 , wherein information to be transferred comprises price information to be displayed by the electronic price label or control information for the electronic price label.

7. An electronic price label of an electronic price label system, the electronic price label system comprising at least one base station and a plurality of electronic labels, the electronic labels comprising at least communication means, wherein, the electronic labels are configured to receive a first message on a first frequency band from the base station, and after receiving the first message, to receive a second message on a second frequency band from the said base station and to send a third message on a second frequency band to the said base station wherein the electronic price labels are configured to send messages by reflecting back a received message.

8. The electronic price label of claim 7 , further comprising an electrophoretic laminate display 3 .

9. The electronic price label of claim 7 , wherein communication means comprise transmitter and receiver.

10. The electronic price label of claim 9 which is configured to vary the mode of an antenna of the receiver to produce the reflected message having a time delay which varies according to the antenna mode.

11. The electronic price label of claim 10 , wherein a phase shift of the signal associated with the reflected message is 180 degrees.

12. The electronic price label of claim 7 , wherein the first frequency band is a higher frequency band than the second frequency band.

13. The electronic price label of claim 12 , wherein the first frequency band is 2.4 GHz ISM-band and the second frequency band is 868 MHz ISM-band.

14. A base station of an electronic price label system, the electronic price label system comprising at least one base station and a plurality of electronic labels, the base station comprising at least communication means wherein, the base station is configured to send a first message on a first frequency band to an electronic label, and after sending the first message, to send a second message at a second frequency band to the said electronic label and to receive a third message on the second frequency band from the said electronic label, wherein the third message is an acknowledgement message to the first message from the electronic label to the base station by reflecting back the second message to the base station.

15. The base station of claim 14 , wherein communication means comprise transmitter and receiver.

16. The base station of claim 14 , wherein the first frequency band is higher than the second frequency.

17. The base station of claim 14 , wherein the first frequency band is 2.4 GHz ISM-band and the second frequency band is MHz ISM-band.

18. An electronic price label system, comprising at least one base station and a plurality of electronic labels wherein the base station(s) and the electronic labels comprise communication means whereby information is transferred between the base station(s) and the electronic labels wherein, the base station or the base stations are configured to send a first message at a first frequency band, and after sending the first message, to send a second message at a second frequency band and to receive a third message on the second frequency band, the electronic labels being configured to receive the first message sent by the said base station at the first frequency band and, after receiving the first message, to receive a second message sent by the said base station at the second frequency band and to send a third message at the second frequency band to the said base station, wherein the third message is sent from the electronic label to the base station by reflecting back the second message to the said base station.