Method and communication station for transmitting data
View Patent ↗In a method for the error-monitored transmission of data via interfaces of a multi-step communication system, the data is transmitted from a transmitter station to a data-receiving station via at least two relay stations which are connected therebetween and receive and further transmit the data parallel to each other. The data is retransmitted if the transmission has been insufficient due to a request from the receiver end and/or due to the lack of a confirmation from the receiver end. In order to increase performance while reducing power consumption of the system, the request or confirmation is generated only by the receiver station and is sent back to the transmitter station. The relay stations consequently do not generate any confirmations or requests.
1. A method for transmitting data in a radio communication system, comprising:
transmitting data in parallel from a transmitting station to a data-receiving station over at least two relay stations, each relay station receiving and forwarding the data;
generating requests for retransmission if it is determined that the received data is not sufficiently free of errors, the requests for retransmission being generated only at the receiving station;
transmitting the requests for retransmission from the receiving station through at least one of the relay stations; and
retransmitting the data from the transmitting station if a request for retransmission is received through the at least one relay station from the receiving station.
2. The method according to claim 1 , wherein
at least one of the relay stations checks the data received from the transmitting station with regard to reception quality,
if the reception quality does not meet a determined level of quality of the received data, the relay station does not forward said data to the receiving station, and
if the reception quality meets the determined level of quality of the received data, the relay station does forward said data to the receiving station.
3. The method according to claim 2 , wherein
the relay stations receive the data in parallel and check the reception quality of the received data,
a first relay station receives the data with acceptable reception quality, and
only the first relay station transmits the data to the receiver station.
4. The method according to claim 2 , wherein error correction and/or error detection is performed in at least one of the relay stations prior to forwarding the data.
5. The method according to claim 1 , wherein
a plurality of the relay stations receive the data in parallel, check the reception quality of the data and produce a reception result, and
in at least a first relay station, a determination is made on whether or not to forward the data based on the reception result of the first relay station and based on the reception result of another relay station.
6. The method according to claim 1 , wherein the transmitting station, the receiving station and at least some of the relay stations belong to a radio communication system communicating on a single frequency.
7. The method according to claim 1 , wherein the data is forwarded over different parallel paths via different relay stations, and the data is preemphasized and/or deemphasized in the relay stations.
8. The method according to claim 1 , wherein the data is forwarded over different parallel paths via different relay stations, and the data is decoded and/or encoded in the relay stations.
9. The method according to claim 1 , wherein
the data is transmitted in parallel over different paths, and
the data is received overlaid at the receiver station and processed jointly.
10. The method for transmitting data in a radio communication system, comprising:
transmitting data in parallel from a transmitting station to a data-receiving station over at least two relay stations, each relay station receiving and forwarding the data;
acknowledging receipt of the data with an acknowledgement by the data-receiving station;
transmitting requests for retransmission from the data-receiving station through at least one of the relay stations; and
retransmitting the data in the event of unsuccessful transmission of the data, when the acknowledgement is not received, retransmission of the data being controlled only by the transmitting station.
11. The method according to claim 10 , wherein
at least one of the relay stations checks the data received from the transmitting station with regard to reception quality,
if the reception quality does not meet a determined level of quality, the relay station does not forward said data to the receiving station, and
if the reception quality meets the determined level of quality, the relay station does forward said data to the receiving station.
12. The method according to claim 11 , wherein
the relay stations receive the data in parallel and check the reception quality of the received data,
a first relay station receives the data with acceptable reception quality, and
only the first relay station transmits the data to the receiver station.
13. The method according to claim 11 , wherein
error correction and/or error detection is performed in at least one of the relay stations prior to forwarding the data.
14. The method according to claim 10 , wherein
a plurality of the relay stations receive the data in parallel, check the reception quality of the data and produce a reception result, and
in at least a first relay station, a determination is made on whether or not to forward the data based on the reception result of the first relay station and based on the reception result of another relay station.
15. The method according to claim 10 , wherein the transmitting station, the receiving station and at least some of the relay stations belong to a radio communication system communicating on a single frequency.
16. A relay station of a radio communication station, comprising:
a receiving device to receive data destined for a receiving station, the data being parallely transmitted from a transmitting station of the radio communication station;
an analyzing device to analyze said data with regard to its reception quality and produce a reception result; and
a transmitting device to selectively forward the data to the receiving station, depending on directly receiving the reception result of the analyzing device.
17. The relay station according to claim 16 , wherein
the data is transmitted in parallel to a plurality of relay stations, and
the relay station forwards the data only if its data reception is superior to that of other relay stations.
18. The relay station according to claim 16 , further comprising a processing device to preemphasize and/or deemphasize the data.
19. The relay station according to claim 16 , further comprising a processing device to decode and/or encode the data.
20. The relay station according to claim 16 , further comprising a processing device to decode the data, preemphasize and/or deemphasize the data and then re-encode the data.