Method for data communication between a base station and a transponder
View Patent ↗A method for data communication between a base station and at least one transponder by a high-frequency electromagnetic carrier signal is disclosed, onto which information packets are modulated, whereby each information packet has a header section, a middle section, and an end section and whereby the middle section has a data field for the transmission of data and/or address information and a protection field placed thereafter for the correction of errors in the transmission of the data and/or address information, whereby after the data field the base station inserts at least one control field, by which the protection field following the inserted control field can be changed in such a way that the duration of an information packet is set variably. The invention relates further to a base station for carrying out this method, to a data communication system containing a base station and at least one transponder in communicative wireless contact with the base station.
1. A method comprising:
a inserting a control field into an information packet comprising one or more data fields and a protection field, the protection field for determining whether a signal is accurately communicated to a transponder, the control field separating the information packet into a first portion preceding the control field and a second portion following the control field;
transmitting, to the transponder, the first portion of the information packet preceding the control field of the information packet;
determining a value of the control field;
transmitting, to the transponder, the second portion of the information packet following the control field when the control field has a first value, the first value indicating that the first portion of the information packet preceding the control field has been correctly received by the transponder; and
retransmitting, to the transponder, the first portion of the information packet preceding the control field when the control field has a second value, the second value indicating that the first portion of the information packet preceding the control field has not been correctly received by the transponder.
2. The method according to claim 1 further comprising not transmitting the second portion of the information packet following the control field and not retransmitting the first portion of the information packet preceding the control field when the control field has a third value.
3. The method according to claim 2 further comprising transmitting at least a portion of a second information packet.
4. The method according to claim 1 further comprising at least one of the following:
inserting the control field immediately after the data field;
inserting the control field after the data field and within the protection field; and
inserting the control field into a forward link of a data communication.
5. A method comprising:
a inserting a control field into an information packet comprising one or more data fields and a protection field, the protection field for determining whether a signal is accurately communicated to a transponder, the control field separating the information packet into a first portion preceding the control field and a second portion following the control field;
transmitting, to the transponder, the first portion of the information packet preceding the control field of the information packet;
determining a value of the control field;
transmitting the second portion of the information packet following the control field when the control field has a first value, the second portion of the information packet following the control field comprising at least a portion of the protection field; and
retransmitting the first portion of the information packet preceding the control field when the control field has a second value.
6. The method according to claim 5 , the first value indicating that the first portion of the information packet preceding the control field has been correctly received by the transponder.
7. The method according to claim 5 , the second value indicating that the first portion of the information packet preceding the control field has not been correctly received by the transponder.
8. The method according to claim 5 further comprising not transmitting the second portion of the information packet following the control field and not retransmitting the first portion of the information packet preceding the control field when the control field has a third value.
9. The method according to claim 8 further comprising transmitting at least a portion of a second information packet.
10. The method according to claim 5 further comprising at least one of the following:
inserting the control field immediately after the data field;
inserting the control field after the data field and within the protection field; and
inserting the control field into a forward link of a data communication.
11. The method according to claim 5 further comprising generating a content of the control field based on data in the data field, the content of the control field predefining the place in the information packet where the control field is inserted.
12. The method according to claim 5 further comprising:
transmitting at least one complete information packet to the transponder in a forward link; and
receiving at least one response signal from the transponder in a return link.
13. The method according to claim 12 further comprising:
transmitting one or more symbols to the transponder in the forward link; and
receiving, in response to transmitting the one or more symbols to the transponder in the forward link, one or more corresponding response signals from the transponder.
14. The method according to claim 5 , wherein the protection field comprises symbols configured as CRC protection symbols by which proper data communication of the information in the data field is assured.
15. A system comprising:
a control device operable to determine a value of the control field; and
a transmitting device operable to:
inserting a control field into an information packet comprising one or more data fields and a protection field, the protection field for determining whether a signal is accurately communicated to a transponder, the control field separating the information packet into a first portion preceding the control field and a second portion following the control field;
transmit, to the transponder, the first portion of the information packet preceding the control field of the information packet, the information packet comprising a protection field and a data field;
transmit, to the transponder, the second portion of the information packet following the control field when the control field has a first value, the second portion of the information packet following the control field comprising at least a portion of the protection field; and
retransmit, to the transponder, the first portion of the information packet preceding the control field when the control field has a second value.
16. The system according to claim 15 , the control device being further operable to assign the first value to the control field in response to determining that the first portion of the information packet preceding the control field has been correctly received by the transponder.
17. The system according to claim 15 , the control device being further operable to assign the second value to the control field in response to determining that the first portion of the information packet preceding the control field has not been correctly received by the transponder.
18. The system according to claim 15 , the transmitting device being further operable to not transmit the second portion of the information packet following the control field and not retransmit the first portion of the information packet preceding the control field when the control field has a third value.
19. The system according to claim 18 , the transmitting device being further operable to transmit at least a portion of a second information packet.
20. The system according to claim 15 , the control device being further operable to do at least one of the following:
insert the control field immediately after the data field;
insert the control field after the data field and within the protection field; and
insert the control field into a forward link of a data communication.
21. The system according to claim 15 , the control device being further operable to generate a content of the control field based on data in the data field, the content of the control field predefining the place in the information packet where the control field is inserted.
22. The system according to claim 15 further comprising a receiving device, the transmitting device being further operable to transmit at least one complete information packet to the transponder in a forward link and the receiving device being operable to receive at least one response signal from the transponder in a return link.
23. The system according to claim 22 further comprising a receiving device, the transmitting device being further operable to transmit one or more symbols to the transponder in the forward link and the receiving device being operable to receive, in response to the transmitting device transmitting the one or more symbols to the transponder in the forward link, one or more corresponding response signals from the transponder.