Data transmission and retransmission
A method transmits data. The method includes transmitting a series of data unit, receiving a retransmission request indicating a plurality of corrupt data units in the transmitted data units which were not received correctly, and retransmitting the corrupted data units.
1. A method of transmitting data, comprising:
transmitting a series of data units;
receiving retransmission requests indicating at least one data unit in the transmitted series of data units as a corrupt data unit which was not received correctly;
analyzing the retransmission requests to detect a periodic pattern according to which pattern corrupt data units occur periodically; and
transmitting and retransmitting further data units corresponding to the periodic pattern, the retransmission being independent of retransmission requests for the respective data units corresponding to the further data units.
2. The method of claim 1 ,
wherein at least some of the retransmission requests indicate a plurality of corrupt data units in the transmitted data units which were not received correctly wherein one of the at least some of the retransmission requests indicates all data units of another one of the retransmission requests and at least one additional data, and
wherein the method further comprises:
retransmitting data units corresponding to the corrupt data units.
3. The method according to claim 1 , wherein the transmitting comprises providing each data unit with an identifier.
4. The method according to claim 3 , wherein the retransmission request comprises an identifier of a first one of the plurality of corrupt data units and an identifier of a last one of the plurality of corrupt data units.
5. The method according to claim 3 , wherein the retransmission request comprises an identifier of one of the data units and information indicating the corrupt data units relative to the one data unit.
6. The method according to claim 5 , wherein the information comprises a bit pattern.
7. The method according to claim 1 , further comprising:
forming the data units by interleaving,
wherein the receiving and retransmitting are performed downstream of the interleaving.
8. The method according to claim 1 , wherein the data units are one of discrete multi-tone modulated data units and orthogonal frequency division multiplex data units.
9. A data transmitter comprising:
a transmission circuit configured to transmit a series of data units;
a receiver circuit configured to receive retransmission requests indicating at least one data unit in the transmitted series of data units as a corrupt data unit which was not received correctly; and
a retransmission control circuit configured to analyze the retransmission requests to detect a periodic pattern according to which pattern corrupt data units occur periodically, and
to control the transmission circuit to transmit and retransmit further data units corresponding to the periodic pattern, the retransmission being independent of retransmission requests for the respective data units corresponding to the further data units.
10. The data transmitter according to claim 9 , wherein the transmission circuit is configured to provide each data unit with an identifier.
11. The data transmitter according to claim 10 , wherein the retransmission request comprises an identifier of a first one of the plurality of corrupt data units and an identifier of a last one of the plurality of corrupt data units.
12. The data transmitter according to claim 10 , wherein the retransmission request comprises an identifier of one of the data units and information indicating the corrupt data units relative to the one data unit.
13. The data transmitter according to claim 12 , wherein the information comprises a bit pattern.
14. The data transmitter according to claim 9 , wherein the retransmission control circuit comprises a state machine.
15. The data transmitter according to claim 14 , wherein the state machine assumes first states if retransmission requests are received correctly and assumes second states if corrupt retransmission requests are received.
16. The data transmitter according to claim 14 , wherein states of the state machine update a variable after each retransmitted corrupt data unit, the variable indicating which corrupt data units have been retransmitted.
17. The data transmitter according to claim 9 , wherein the transmission circuit comprises an interleaver, wherein the retransmission control circuit is configured to control the transmission circuit downstream of the interleaver.
18. The data transmitter according to claim 9 , wherein the transmission circuit comprises one of a discrete multi-tone modulator and an orthogonal frequency division multiplex modulator.