Method and device for data transmission
View Patent ↗A method for transmitting data between a base station and at least one remote unit is provided. Conventional approaches to communication based on a predefined uniform transmission protocol do not function especially in open RFID systems with at least one base station and tags of a different (and variable) type and number, in which different customers are provided with one and the same tag solution. Primarily if several customers each wish to use a customer-specific solution, this can no longer be represented by a single uniform code. The method of the present invention makes it possible to introduce new, protocol-extending instruction sequences (protocol extensions) and to recognize these reliably as such, whereby these are not in conflict with the existing protocol.
1. A method for transmitting data between a base station and at least one transponder with an electromagnetic wave, the method comprising the steps of:
modulating information packets of different symbols onto the electromagnetic wave, the information packets having at least one header section and one data section, the symbols being defined in the header section of at least one information packet, and
encoding data via the symbols in a subsequent data section; and
transmitting the data,
wherein, to change an employed transmission protocol, at least one header section is modified so that in any one of said at least one a transponder, which does not support the changed protocol, an error condition is triggered and said any one of said at least one transponder thereupon withdraws from communication with the base station, wherein any other one of said at least one transponder which does support the changed protocol remains in communication with the base station.
2. The method according to claim 1 , wherein a first symbol of the at least one header section is modified.
3. The method according to claim 2 , wherein a first logic symbol of the at least one header section is changed to its opposite logic symbol.
4. The method according to claim 3 , wherein the first symbol of the at least one header section is temporarily stored and linked with a subsequent calibration symbol, to detect a modification of the first symbol.
5. The method according to claim 1 , wherein, during a modification of the at least one header section in said any other one of said at least one transponder which does support the changed protocol, a pseudo-data stream of at least one signal pulse is generated.
6. The method according to claim 5 , wherein the pseudo-data stream is generated during the at least one header section and/or directly after receipt of a last header section symbol.
7. The method according to claim 5 , wherein, in accordance with the pseudo-data stream, a subsequent data section is checked for its validity.
8. The method according to claim 7 , wherein a number of data bits to be transmitted in the data section are checked.
9. The method according to claim 8 , wherein a parameter, a CRC, or parity datum that is allocated to the subsequent data section is checked.
10. The method according to claim 9 , wherein the checking of the parameter triggers the error condition in the units not supporting the changed protocol.
11. The method according to claim 9 , wherein, in said any other one of said at least one transponder which does support the changed protocol, an initial datum necessary for checking the parameter during modification of the at least one header section is set to be different than a standard value.
12. The method according to claim 11 , wherein the initial datum necessary for checking the parameter is transmitted from the base station to the at least one transponder.
13. The method according to claim 12 , wherein the initial datum is transmitted with the at least one header section.
14. The method according to claim 9 , wherein the parameter is generated by the base station with consideration of the pseudo-data stream generated in the unit supporting the changed protocol.
15. A device for transmitting data by an electromagnetic wave, onto which information packets of different symbols can be modulated, the device comprising:
a base station; and
at least one transponder, the information packets having at least one header section and one data section, the symbols being defined in the header section of at least one information packet, and in a subsequent data section, data can be encoded by the symbols and transmitted,
wherein the base station for a purpose of changing an employed transmission protocol modifies at least one header section, by which in any one of said at least one transponder not supporting the changed protocol, an error condition associated with withdrawal from communication with the base station is triggered, and
wherein any other one of said at least one transponder which does support the changed protocol remains in communication with the base station.
16. The device according to claim 15 , wherein the at least one transponder includes a temporary memory unit for a symbol, which is modified compared with a first protocol, of the at least one header section, a linking unit for the temporarily stored symbol, a calibration symbol, and a determining unit that detects the modification of the temporarily stored symbol.
17. The device according to claim 15 , wherein said any other one of said at least one transponder which does support the changed protocol a during the modification of the at least one header section generates a pseudo-data stream of at least one signal pulse.
18. The device according to claim 17 , wherein a circuit unit checks a subsequent data section for its validity in accordance with the pseudo-data stream.
19. The device according to claim 18 , wherein the circuit unit checks a number of data bits to be transmitted in the data section.
20. The device according to claim 18 , wherein the circuit unit checks a parameter allocated to the data section, such as a CRC or parity datum.
21. The device according to claim 20 , wherein the circuit unit is a CRC or parity unit.