Method and device for data processing and communication system comprising such device
A method and a device for data processing in a network having a first network element and a second network element performs the following steps: (a) the second network element provides a control information to the first network element; (b) a portion of data sent from the first network element to the second network element is identified by the control information; and (c) upon identification of the portion of data a retransmission from the first network element to the second network element can be initiated.
1. In a network including a first network element and a second network element, a data processing method, which comprises:
organizing data in frames to obtain data frames at the first network element, the data frames having control information including a cyclic redundancy check content;
storing the data frames in a buffer of the first network element;
transmitting the data frames from the first network element to the second network element;
providing the control information, including the cyclic redundancy check content received at the second network element, from the second network element back to the first network element;
if the control information provided back to the first network element corresponds to the control information of a data frame that is the oldest data frame stored in the buffer of the first network element, deleting said data frame from the buffer of the first network element;
if the control information provided back to the first network element does not correspond to the control information of any data frame stored in the buffer of the first network element, taking no action;
if the control information provided back to the first network element corresponds to the control information of a data frame that is not the oldest data frame stored in the buffer of the first network element, deleting said data frame from the buffer of the first network element and retransmitting data frames older than said data frame from the first network element to the second network.
2. The method according to claim 1 configured at a data link layer or at a physical layer.
3. The method according to claim 1 , which comprises using the Ethernet protocol in the network.
4. The method according to claim 1 , wherein the first network element and the second network element are connected via a digital subscriber line.
5. The method according to claim 1 , wherein the control information includes a first cyclic redundancy check content received at the second network element, and a second cyclic redundancy check content calculated from a received payload at the second network element.
6. The method according to claim 5 , wherein the first network element retransmits the data frame if the first content and/or the second content conveyed to the first network element via the control information, does/do not match a content determined by the first network element for the particular data frame.
7. The method according to claim 6 , wherein the first content includes a cyclic redundancy check content received at the second network element and the second content includes a cyclic redundancy check content calculated from the received data by the second network element.
8. The method according to claim 1 , wherein at least one of the first network element and the second network element is a digital subscriber line access multiplexer.
9. The method according to claim 1 , wherein the second network element is a customer premises equipment.
10. The method according to claim 1 , wherein the second network element is a customer premises Digital Subscriber Line modem.
11. A data processing device, comprising a processor unit with a processor configured and programmed to execute the method according to claim 1 on said processor unit.
12. The device according to claim 11 configured as a communication device.
13. The device according to claim 11 configured as a network element.
14. The device according to claim 11 configured as a Digital Subscriber Line Access Multiplexer or a Digital Subscriber Line modem.
15. The method according to claim 1 , which comprises sending the control information only in case the data frame is received incorrectly.
16. The method according to claim 1 , which comprises, in the first network element, comparing the cyclic redundancy check content comprised by the control information to the cyclic redundancy check content of the data frames stored in the buffer.
17. A device, comprising:
a first network element including a processor configured to:
organize data in frames to obtain data frames, the data frames having control information including a cyclic redundancy check content;
store the data frames in a buffer of the first network element;
transmit the data frames with the control information including the cyclic redundancy check content to a second network element;
receive from the second network element, the control information including the cyclic redundancy check content that was previously transmitted to the second network element;
if the control information provided back to the first network element corresponds to the control information of a data frame that is the oldest data frame stored in the buffer of the first network element, delete said data frame from the buffer of the first network element;
if the control information provided back to the first network element does not correspond to the control information of any data frame stored in the buffer of the first network element, take no action; and
if the control information provided back to the first network element corresponds to the control information of a data frame that is not the oldest data frame stored in the buffer of the first network element, delete said data frame from the buffer of the first network element and retransmit data frames older than said data frame from the first network element to the second network.
18. The device according to claim 17 , wherein the first network element is a Digital Subscriber Line Access Multiplexer and the second network element is a Digital Subscriber Line Modem.
19. A communication system, comprising:
a first network element and a second network element;
the first network element including a processor configured to:
organize data in frames to obtain data frames, the data frames having control information including a cyclic redundancy check content,
store the data frames in a buffer of the first network element;
transmit the data frames with the control information including the cyclic redundancy check content to the second network element,
receive from the second network element, the control information including the cyclic redundancy check content that was previously transmitted to the second network element,
if the control information provided back to the first network element corresponds to the control information of a data frame that is the oldest data frame stored in the buffer of the first network element, delete said data frame from the buffer of the first network element;
if the control information provided back to the first network element does not correspond to the control information of any data frame stored in the buffer of the first network element, take no action; and
if the control information provided back to the first network element corresponds to the control information of a data frame that is not the oldest data frame stored in the buffer of the first network element, delete said data frame from the buffer of the first network element and retransmit data frames older than said data frame from the first network element to the second network.
20. The communication system according to claim 18 , wherein the first network element is a Digital Subscriber Line Access Multiplexer and the second network element is a Digital Subscriber Line Modem.